JP2006078971A - System and method for display control, device and method for information processing, device and method for display, recording medium, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an intense light from being projected on a place, where light need not be projected and to prevent a human body from being irradiated with the intense light. <P>SOLUTION: A projector 1 projects laser light to display an image. A safety card 401 arranged on a screen 32 calculates the distance between the safety card 401 and a communication device 14, based on a signal sent from the communication device 14 and calculates the distance between the safety card 11 and a controller 13 provided on the projector 1, based on a signal sent from the controller 13 to compute the position of the safety card 401 based on the two calculated distances, thereby transmitting a signal indicating the position of the safety card 401 to the controller 13. The controller 13 receives the signal from the safety card 401 and allows a light displaying the image to be projected on the screen 32, when the position of the safety card 401 contained in the signal is in the direction to the screen 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display control system and method, an information processing device and method, a display device and method, a recording medium, and a program, and in particular, a display control system and method capable of preventing strong light irradiation to humans. The present invention relates to an information processing apparatus and method, a display apparatus and method, a recording medium, and a program.

  In recent years, high-quality and low-priced projectors have been sold. Along with this, projectors have spread to ordinary households, and an increasing number of households have home theaters using projectors.

  As the demand for projectors has increased, projectors that project stronger light have been developed to display higher quality images.

  However, when a person directly looks at the strong light projected by the projector, there is a risk that the eyes (sight) may be damaged.

  This is also the case in projectors that project images by projecting laser (LASER (Light Amplification by Stimulated Emission of Radiation)) light (hereinafter referred to as laser light) onto the screen. That is true.

  In products using lasers, there is an international standard (IEC (International Electro technical Commission) 60825) for ensuring the safety of lasers. This international standard (IEC60825) stipulates how to use lasers.

  In addition, APR (Automatic Power Reduction) has been proposed as a method of preventing the audience from irradiating a laser beam with strong light intensity.

  As a technology accompanying this, for example, in Patent Document 1, as a safety device of a projection type television receiver that projects an image on a screen, reflecting members are arranged on both left and right ends of the screen, and the reflecting member is Irradiates non-visible light such as infrared rays, and detects whether a moving object (human) enters the screen projection area based on whether or not the reflected light is blocked by humans, and reduces or blocks light output. Technology is disclosed.

Patent Document 2 discloses a technique in which the technique described in Patent Document 1 is applied to a projector that displays an image on a screen by projecting laser light. That is, in Patent Document 2, an image is displayed by a laser beam projected by a projector, a monitoring area is provided around the screen, a viewer entering the monitoring area is detected by a sensor, and the viewer is detected. In this case, a technique for turning off the laser of the projector is disclosed.
Japanese Laid-Open Patent Publication No. 4-111585 Japanese National Patent Publication No. 11-501419

  However, conventional projectors project light for displaying an image regardless of the location when the switch is turned on.

  Therefore, if the user randomly turns on the projector, the light may be projected to a place where light does not need to be projected (a place where light should not be projected), for example, a place where a person is present. There was a problem that there was sex.

  In addition, if the projector 1 is misplaced during the projection of light by the projector 1, a person in the vicinity of the projector 1 or near the light projected by the projector 1 is irradiated with strong light. There was a problem of ending up.

  The present invention has been made in view of such a situation, and while preventing light having a high intensity from being projected to a place where it is not necessary to project light, it is possible to irradiate a human with a light having a high intensity. It is something that can be prevented.

  In the display control system of the present invention, the information processing apparatus is transmitted from the first wireless signal for calculating the first distance between the information processing apparatus and the communication apparatus transmitted from the communication apparatus, and the display apparatus. A first receiving means for receiving a second radio signal for calculating a second distance between the information processing apparatus and the display apparatus; a first distance based on the first radio signal; Distance calculating means for calculating the second distance based on the two radio signals, position calculating means for calculating the position on the plane of the information processing device based on the first distance and the second distance, and information processing First transmission means for transmitting a third wireless signal indicating a position on the plane of the device to the display device, and the communication device calculates a first distance between the information processing device and the communication device. Including second transmission means for transmitting one wireless signal to the information processing apparatus. The display device has been transmitted from the information processing device and third transmission means for transmitting the second wireless signal for calculating the second distance between the information processing device and the display device to the information processing device. When the second receiving means for receiving the third wireless signal indicating the position on the plane of the information processing apparatus and the position on the plane of the information processing apparatus are within the permitted area in the direction in which the light is projected, Projection permission means for permitting projection of light for displaying an image onto a display area.

  In the display control method of the present invention, the communication device transmits a first wireless signal for calculating the first distance between the information processing device and the communication device to the information processing device, and the display device A second wireless signal for calculating a second distance between the display device and the display device is transmitted to the information processing device, and the information processing device transmits the first information between the information processing device and the communication device transmitted from the communication device. Receiving a first wireless signal for calculating a distance between the information processing apparatus and the display apparatus, and receiving a second wireless signal for calculating a second distance between the information processing apparatus and the display apparatus. The first distance is calculated based on the first radio signal, the second distance is calculated based on the second radio signal, and the plane of the information processing device is calculated based on the first distance and the second distance. The third wireless signal indicating the position on the plane of the information processing device is displayed. The display device receives the third wireless signal indicating the position on the plane of the information processing device transmitted from the information processing device, and the position on the plane of the information processing device projects light. If it is within the permission area in the direction to be directed, the projection of the light for displaying the image onto the display area is permitted.

  The information processing apparatus according to the present invention includes a first wireless signal for calculating a first distance between the communication apparatus and the self transmitted from the communication apparatus, and between the display apparatus and the self wireless apparatus transmitted from the display apparatus. A receiving means for receiving a second radio signal for calculating the second distance, a first distance is calculated based on the first radio signal, and a second distance is calculated based on the second radio signal. A distance calculating means for calculating, a position calculating means for calculating a position on the own plane based on the first distance and the second distance, and a third wireless signal indicating the position on the own plane are displayed. And transmitting means for transmitting to.

  The transmission means can transmit a third wireless signal including identification information for identifying itself to the display device.

  An information processing method of the present invention includes a first wireless signal for calculating a first distance between an information processing device transmitted from a communication device and the communication device, and an information processing device transmitted from a display device. A receiving step for receiving a second wireless signal for calculating a second distance from the display device; a first distance based on the first wireless signal; a first distance calculated based on the second wireless signal; 2 shows a distance calculating step for calculating a distance of 2, a position calculating step for calculating a position on the plane of the information processing apparatus based on the first distance and the second distance, and a position on the plane of the information processing apparatus. And a transmission step of transmitting the third wireless signal to the display device.

  The first recording medium program of the present invention is transmitted from the first wireless signal for calculating the first distance between the information processing apparatus and the communication apparatus transmitted from the communication apparatus, and the display apparatus. A reception control step for controlling reception of a second radio signal for calculating a second distance between the information processing device and the display device; a first distance based on the first radio signal; A distance calculating step for calculating the second distance based on the wireless signal, a position calculating step for calculating a position on the plane of the information processing device based on the first distance and the second distance, and the information processing device And a transmission control step for controlling transmission of a third wireless signal indicating the position on the plane to the display device.

  The first program of the present invention includes a first radio signal for calculating a first distance between an information processing device and a communication device transmitted from a communication device, and an information processing device transmitted from a display device. And a reception control step for controlling reception of a second wireless signal for calculating a second distance between the display device and the display device, a first distance is calculated based on the first wireless signal, and a second wireless signal is calculated. A distance calculating step for calculating a second distance based on the first distance, a position calculating step for calculating a position on the plane of the information processing apparatus based on the first distance and the second distance, and a plane on the information processing apparatus And a transmission control step for controlling transmission of a third wireless signal indicating the position of the wireless signal to the display device.

  The display device of the present invention is at least one information processing device arranged in a display area for displaying an image, and calculates a first distance between the information processing device transmitted from the communication device and the communication device. Transmitting means for transmitting a second wireless signal for calculating a second distance between the information processing apparatus and the information processing apparatus, to the information processing apparatus that receives the first wireless signal for causing the information processing apparatus to receive the first wireless signal; Receiving means for receiving a third radio signal indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the second distance; and information When the position on the plane of the processing device is within the permission area in the direction in which the light is projected, it includes projection permission means for permitting the projection of the light for displaying the image onto the display area.

  The display device can project light in the direction of the laser to display an image.

  The display method of the present invention calculates at least one information processing device arranged in a display area for displaying an image, and calculates a first distance between the information processing device transmitted from the communication device and the communication device. A transmission step of transmitting a second wireless signal for calculating a second distance between the information processing device and the display device, to the information processing device that receives the first wireless signal to be transmitted; Receiving a third wireless signal indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the second distance; A projection permission step for permitting the projection of the light for displaying the image onto the display area when the position on the plane of the information processing device is within the permission area in the direction in which the light is projected.

  The program of the second recording medium of the present invention is at least one information processing device arranged in a display area for displaying an image, and is a first of the information processing device and the communication device transmitted from the communication device. Transmission for controlling transmission of a second wireless signal for calculating a second distance between the information processing device and the display device to an information processing device that receives the first wireless signal for calculating a distance of one The third wireless indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the control step and the first distance and the second distance When the reception control step for controlling the reception of the signal and the position on the plane of the information processing device are within the permitted area in the direction in which the light is projected, the projection that permits the projection of the light for displaying the image onto the display area Including authorization steps And wherein the door.

  A second program of the present invention is at least one information processing device arranged in a display area for displaying an image, and a first distance between the information processing device and the communication device transmitted from the communication device. A transmission control step for controlling transmission of a second radio signal for calculating a second distance between the information processing device and the display device to an information processing device that receives the first radio signal for calculating And receiving a third wireless signal indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the first distance and the second distance. A reception control step for controlling the information processing, and a projection permission step for permitting the projection of the light for displaying the image onto the display region when the position on the plane of the information processing device is within the permission region in the direction in which the light is projected. On the computer Characterized in that to the row.

  According to the display control system and the display control method of the present invention, the first wireless signal for causing the information processing device to calculate the first distance between the information processing device and the communication device transmitted from the communication device, and A second wireless signal for calculating a second distance between the information processing device and the display device transmitted from the display device is received, the first distance is calculated based on the first wireless signal, and the first distance is calculated. The second distance is calculated based on the two radio signals, the position on the plane of the information processing apparatus is calculated based on the first distance and the second distance, and indicates the position on the plane of the information processing apparatus. A third wireless signal is transmitted to the display device. Further, the communication device transmits a first wireless signal for calculating the first distance between the information processing device and the communication device to the information processing device. Further, the second wireless signal for calculating the second distance between the information processing device and the display device is transmitted to the information processing device by the display device, and the information processing device transmitted from the information processing device When the third wireless signal indicating the position on the plane is received and the position on the plane of the information processing apparatus is within the permission area in the direction in which the light is projected, projection of the light to display the image on the display area Is allowed.

  According to the information processing apparatus, the information processing method, the first recording medium program, and the first program of the present invention, the first distance between the information processing apparatus transmitted from the communication apparatus and the communication apparatus is calculated. And a second wireless signal for calculating a second distance between the information processing device and the display device transmitted from the display device are received, and the first wireless signal is received based on the first wireless signal. The first distance is calculated, the second distance is calculated based on the second radio signal, the position on the plane of the information processing device is calculated based on the first distance and the second distance, and the information A third wireless signal indicating the position of the processing device on the plane is transmitted to the display device.

  According to the display device, the display method, the program of the second recording medium, and the second program of the present invention, at least one information processing device arranged in a display area for displaying an image, the communication device The second distance between the information processing device and the display device is calculated for the information processing device that receives the first wireless signal for calculating the first distance between the information processing device and the communication device transmitted from On the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the first distance and the second distance. When the third wireless signal indicating the position of the image is received and the position on the plane of the information processing device is within the permitted area in the direction in which the light is projected, the projection of the light for displaying the image onto the display area is permitted. Is done.

  According to the present invention, data can be transmitted and received. Further, according to the present invention, it is possible to prevent light having high intensity from being projected onto a place where it is not necessary to project light, and to prevent irradiation of light having high intensity to a human being.

  Embodiments of the present invention will be described below. Correspondences between constituent elements described in the claims and specific examples in the embodiments of the present invention are exemplified as follows. This description is to confirm that specific examples supporting the invention described in the claims are described in the embodiments of the invention. Therefore, even though there are specific examples that are described in the embodiment of the invention but are not described here as corresponding to the configuration requirements, the specific examples are not included in the configuration. It does not mean that it does not correspond to a requirement. On the contrary, even if a specific example is described here as corresponding to a configuration requirement, this means that the specific example does not correspond to a configuration requirement other than the configuration requirement. not.

  Further, this description does not mean that all the inventions corresponding to the specific examples described in the embodiments of the invention are described in the claims. In other words, this description is an invention corresponding to the specific example described in the embodiment of the invention, and the existence of an invention not described in the claims of this application, that is, in the future, a divisional application will be made. Nor does it deny the existence of an invention added by amendment.

  The display control system according to claim 1 is a display device that projects light in a predetermined direction to display an image (for example, the projector 1 and the control device 13 in FIG. 15), and a display area that displays an image (for example, FIG. 15 and at least one information processing device (for example, the communication device 14 in FIG. 15), and the information processing device (for example, the safety cards 401-1 to 401-4 in FIG. 16) wirelessly. A display control system including at least one communication device that performs communication, in which the information processing device has a first distance between the information processing device and the communication device transmitted from the communication device (for example, the distance in FIG. 19). 421) and a second wireless signal for calculating a second distance between the information processing device and the display device transmitted from the display device First receiving means (for example, the receiving unit 44 in FIG. 3) that receives the first distance is calculated based on the first wireless signal, and the second distance (for example, based on the second wireless signal) A distance calculating means (for example, distance calculating means 72 in FIG. 4) for calculating the distance 422 in FIG. 19 and a position for calculating the position on the plane of the information processing device based on the first distance and the second distance Calculation means (for example, the position calculation unit 73 in FIG. 4) and first transmission means for transmitting a third wireless signal indicating the position on the plane of the information processing apparatus to the display device (for example, the transmission unit 45 in FIG. 3). ), And the communication device transmits a first radio signal for calculating the first distance between the information processing device and the communication device to the information processing device (for example, FIG. 6). And the display device calculates a second distance between the information processing device and the display device. A third transmission means for transmitting the second wireless signal to the information processing apparatus (for example, the transmission unit 91 in FIG. 17), and the position on the plane of the information processing apparatus transmitted from the information processing apparatus When the second receiving means (for example, the receiving unit 93 in FIG. 17) that receives the third radio signal indicating the position and the position on the plane of the information processing apparatus are within the permitted area in the direction in which the light is projected And a projection permission means (for example, a projection permission unit 412 in FIG. 17) that permits the projection of the light for displaying the image onto the display area.

  The display control method according to claim 2 is a display device that projects light in a predetermined direction to display an image (for example, the projector 1 and the control device 13 in FIG. 15), and a display area that displays an image (for example, FIG. 15 at least one information processing device (for example, safety cards 401-1 to 401-4 in FIG. 16) and at least one communication device that performs wireless communication with the information processing device. In the display control method of the display control system (for example, the communication device 14 of FIG. 15), the communication device calculates a first distance (for example, the distance 421 of FIG. 19) between the information processing device and the communication device. A first wireless signal to be transmitted to the information processing device (for example, the process of step S301 in FIG. 18), and the display device uses a second distance (example) between the information processing device and the display device. For example, the second wireless signal for calculating the distance 422 in FIG. 19 is transmitted to the information processing apparatus (for example, the process in step S351 in FIG. 18), and the information processing apparatus has been transmitted from the communication apparatus. The first wireless signal for calculating the first distance between the information processing device and the communication device is received (for example, the process of step S331 in FIG. 18), and the information processing device and the display device transmitted from the display device The second radio signal for calculating the second distance is received (for example, the process of step S332 in FIG. 18), and the first distance is calculated based on the first radio signal (for example, FIG. 18 in step S333), the second distance is calculated based on the second radio signal (for example, step S334 in FIG. 18), and information processing is performed based on the first distance and the second distance. Calculate the position of the device on the plane (For example, the process of step S335 in FIG. 18), a third wireless signal indicating the position of the information processing apparatus on the plane is transmitted to the display apparatus (for example, the process of step S336 in FIG. 18). A third wireless signal transmitted from the processing device and indicating the position on the plane of the information processing device is received (for example, the process in step S352 of FIG. 18), and the position of the information processing device on the plane is If within the permitted area in the projected direction (for example, “Yes” in the process of step S382 in FIG. 20), the projection of the light for displaying the image onto the display area is permitted (for example, in step S383 of FIG. 20). Processing).

  The information processing apparatus according to claim 3 is an information processing apparatus (for example, safety cards 401-1 to 401-4 in FIG. 16) disposed in a display area (for example, the screen 32 in FIG. 15) for displaying an image. In addition, wireless communication is performed with a display device (for example, the projector 1 in FIG. 15) that projects light in a predetermined direction to display an image, and at least one communication device (for example, a predetermined signal) is transmitted. In the information processing apparatus that performs wireless communication with the communication device 14 in FIG. 15, a first distance for calculating the first distance (for example, the distance 421 in FIG. 19) between the communication device 14 and the communication device that is transmitted from the communication device. Receiving means (for example, a second wireless signal for calculating a second distance (for example, a distance 422 in FIG. 19) between the display device and the wireless signal transmitted from the display device) For example, the receiving unit 44 in FIG. 3 and a distance calculating unit (for example, FIG. 4) that calculates the first distance based on the first radio signal and calculates the second distance based on the second radio signal. Distance calculation unit 72), position calculation means for calculating the position on its own plane based on the first distance and the second distance (for example, position calculation unit 73 in FIG. 4), and on its own plane And a transmission means (for example, the transmission unit 45 in FIG. 3) for transmitting a third wireless signal indicating the position to the display device.

  The information processing method according to claim 5 is an information processing device (for example, safety cards 401-1 to 401-4 in FIG. 16) arranged in a display area (for example, screen 32 in FIG. 15) for displaying an image. In addition, wireless communication is performed with a display device (for example, the projector 1 in FIG. 15) that projects light in a predetermined direction to display an image, and at least one communication device (for example, a predetermined signal) is transmitted. 15 is an information processing method of an information processing apparatus that performs wireless communication with the communication apparatus 14 in FIG. 15, and a first distance between the information processing apparatus transmitted from the communication apparatus and the communication apparatus (for example, a distance 421 in FIG. 19). ) And a second wireless signal for calculating a second distance (for example, a distance 422 in FIG. 19) between the information processing device transmitted from the display device and the display device. A reception step of receiving a line signal (for example, the processing of step S331 and step S332 in FIG. 18), a first distance is calculated based on the first wireless signal, and a second distance is calculated based on the second wireless signal. A distance calculating step for calculating the distance (for example, the processing in step S333 and step S334 in FIG. 18), and a position calculating step for calculating the position on the plane of the information processing device based on the first distance and the second distance. (For example, the process of step S335 of FIG. 18) and a transmission step of transmitting a third wireless signal indicating the position of the information processing apparatus on the plane to the display apparatus (for example, the process of step S336 of FIG. 18). It is characterized by that.

  The recording medium program according to claim 6 is an information processing apparatus (for example, safety cards 401-1 to 401-4 in FIG. 16) arranged in a display area (for example, screen 32 in FIG. 15) for displaying an image. The wireless communication with a display device (for example, the projector 1 in FIG. 15) that projects light in a predetermined direction and displays an image, and at least one communication device (for example, a predetermined signal) 15 is a program for information processing of an information processing device that performs wireless communication with the communication device 14) in FIG. 15, and a first distance between the information processing device and the communication device transmitted from the communication device (for example, FIG. 19). The first wireless signal for calculating the distance 421) and the second distance (for example, the distance 422 in FIG. 19) between the information processing apparatus transmitted from the display apparatus and the display apparatus are calculated. A reception control step for controlling the reception of the second wireless signal for the purpose (for example, the processing of step S331 and step S332 in FIG. 18), the first distance is calculated based on the first wireless signal, and the second The distance calculation step (for example, the processing of step S333 and step S334 in FIG. 18) for calculating the second distance based on the wireless signal of FIG. 18 and the plane of the information processing device based on the first distance and the second distance A position calculation step for calculating the upper position (for example, the process of step S335 in FIG. 18) and a transmission control step for controlling transmission of the third wireless signal indicating the position on the plane of the information processing device to the display device ( For example, the process includes a process of step S336 in FIG.

  The program according to claim 7 is an information processing apparatus (for example, safety cards 401-1 to 401-4 in FIG. 16) arranged in a display area (for example, the screen 32 in FIG. 15) that displays an image. At least one communication device (for example, FIG. 15) that performs wireless communication with a display device (for example, the projector 1 in FIG. 15) that projects light in a predetermined direction and displays an image. A communication apparatus 14) is a program for causing a computer that controls an information processing apparatus that performs wireless communication to perform information processing, and a first distance between the information processing apparatus and the communication apparatus transmitted from the communication apparatus (for example, , A first wireless signal for calculating the distance 421 in FIG. 19, and a second distance (for example, FIG. 19) between the information processing apparatus transmitted from the display apparatus and the display apparatus. The reception control step (for example, the processing of step S331 and step S332 in FIG. 18) for controlling the reception of the second wireless signal for calculating the distance 422), and the first distance based on the first wireless signal. Based on the distance calculation step of calculating and calculating the second distance based on the second radio signal (for example, the processing of step S333 and step S334 in FIG. 18), and the first distance and the second distance, Controls the position calculation step for calculating the position of the information processing device on the plane (for example, the process of step S335 in FIG. 18) and the transmission of the third wireless signal indicating the position of the information processing device on the plane to the display device. Including a transmission control step (for example, the process of step S336 in FIG. 18).

  The display device according to an eighth aspect is a display device (for example, the projector 1 in FIG. 15) that projects light in a predetermined direction and displays an image, and a display area (for example, in FIG. 15) that displays an image. At least one information processing device (for example, safety cards 401-1 to 401-4 in FIG. 16) arranged on the screen 32) and transmitted from the communication device (for example, the communication device 14 in FIG. 15). The information processing apparatus and the information processing apparatus receive the first wireless signal for calculating the first distance between the information processing apparatus and the communication apparatus (for example, the distance 421 in FIG. 19). 2 (for example, the transmission unit 91 in FIG. 17) that transmits a second wireless signal for calculating a distance of 2 (for example, the distance 422 in FIG. 19), and the first distance and the second distance. The information processing device Receiving means (for example, receiving unit 93 in FIG. 17) for receiving a third wireless signal indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the surface; When the position on the plane is within the permission area in the direction in which the light is projected, projection permission means (for example, the projection permission unit 412 in FIG. 17) that permits the projection of the light for displaying the image onto the display area; It is characterized by including.

  The display method according to claim 10 is a display method of a display device (for example, the projector 1 in FIG. 15) that projects light in a predetermined direction to display an image, and displays a display area (for example, an image) 15 is at least one information processing device (for example, safety cards 401-1 to 401-4 in FIG. 16) disposed on the screen 32) and a communication device (for example, the communication device 14 in FIG. 15). The information processing device and the display are displayed for the information processing device that receives the first wireless signal for calculating the first distance (for example, the distance 421 in FIG. 19) between the information processing device and the communication device transmitted from A transmission step (for example, the process of step S351 in FIG. 18) for transmitting a second radio signal for calculating a second distance (for example, the distance 422 in FIG. 19) with the device; A reception step of receiving a third wireless signal indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the distance of 2 (for example, FIG. 18 and the projection permission step for permitting the projection of the light for displaying the image onto the display area when the position on the plane of the information processing device is within the permission area in the direction in which the light is projected. (For example, the process of step S383 in FIG. 20).

  The recording medium program according to claim 11 is a program for display processing of a display device (for example, the projector 1 in FIG. 15) that projects light in a predetermined direction to display an image, and displays the image. At least one information processing device (for example, safety cards 401-1 to 401-4 in FIG. 16) arranged in a display area (for example, screen 32 in FIG. 15), and a communication device (for example, FIG. 15). To the information processing device that receives the first wireless signal for calculating the first distance (for example, the distance 421 in FIG. 19) between the information processing device and the communication device transmitted from the communication device 14). A transmission control step (for example, step S in FIG. 18) for controlling transmission of the second radio signal for calculating the second distance (for example, the distance 422 in FIG. 19) between the information processing device and the display device. 51, and a third position indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the first distance and the second distance. If the reception control step for controlling the reception of the wireless signal (for example, the process of step S352 in FIG. 18) and the position on the plane of the information processing apparatus are within the permitted area in the direction in which the light is projected, the image is displayed. A projection permission step (for example, the process of step S383 in FIG. 20) that permits the projection of light to be displayed onto the display area.

  A program according to a twelfth aspect is a program that causes a computer that controls a display device (for example, the projector 1 in FIG. 15) that projects light in a predetermined direction to display an image, and performs display processing. At least one information processing device (for example, safety cards 401-1 to 401-4 in FIG. 16) disposed in a display area (for example, screen 32 in FIG. 15), and a communication device (for example, , An information processing apparatus that receives a first wireless signal for calculating a first distance (for example, distance 421 in FIG. 19) between the information processing apparatus and the communication apparatus transmitted from the communication apparatus 14 in FIG. A transmission control step (for example, for controlling transmission of a second radio signal for calculating a second distance (for example, distance 422 in FIG. 19) between the information processing device and the display device) The position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the first distance and the second distance in step S351 in FIG. The reception control step (for example, the process of step S352 of FIG. 18) for controlling the reception of the third wireless signal indicating the position of the information processing device on the plane is within the permitted region in the direction in which the light is projected. In this case, a projection permission step (for example, the process of step S383 in FIG. 20) for allowing the projection of the light for displaying the image onto the display area is executed.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an example of an embodiment of a display control system according to the present invention. The projector 1 displays a predetermined image on a screen 32 to be described later with reference to FIG. 2 by projecting, for example, laser light as light projected to project an image (hereinafter referred to as projection light) (see FIG. 2). Project). Further, the projector 1 projects laser light for displaying a predetermined image onto the screen 32 by controlling the intensity of the laser light by using a GLV (Grating Light Valve) which is a display device, for example.

  A viewer who views the image projected by the projector 1 and the sound reproduced along with the image carries the safety card 11. The safety card 11 is provided with a string 12, and the viewer carries the safety card 11 by putting the string 12 on the neck or by putting the safety card 11 in a pocket or the like.

  The safety card 11 is an IC (Integrated Circuit) tag that performs communication processing using microwaves or predetermined light, and receives a predetermined signal transmitted at a predetermined time difference from a control device 13 and a communication device 14 described later. To do. The safety card 11 determines the distance between the safety card 11 and the control device 13 (projector 1) and the distance between the safety card 11 and the communication device 14 based on signals transmitted from the control device 13 and the communication device 14. Calculate and calculate (specify) the current position of the user (safety card 11). Furthermore, the safety card 11 transmits information indicating its own current position to the control device 13.

  For example, the safety card 11 is a two-dimensional coordinate having the control device 13 (projector 1) as an origin, and the safety card 11 itself (on the coordinates determined based on the positions of the control device 13, the communication device 14, and the screen 32 described later) The position of the safety card 11) is calculated.

  The control device 13 is provided in the projector 1 and includes, for example, a CPU (Central Processing Unit) or an embedded MPU (Micro Processing Unit), a dedicated IC (Integrated Circuit), a clock generator, a real-time clock, or the like. The Further, the control device 13 is output from its own (control device 13) clock generator synchronized with a clock generator 46 of the safety card 11 and a clock generator of the communication device 14 which will be described later with reference to FIG. A predetermined signal is transmitted to the safety card 11 after a predetermined time (with a predetermined time difference) from the transmission of the signal of the communication device 14 based on the clock.

  Furthermore, the control device 13 instructs the projector 1 to reduce the laser light projected by the projector 1 based on the information indicating the current position of the safety card 11 transmitted from the safety card 11. More specifically, the control device 13 determines whether or not the current position of the safety card 11 is in a region (area) where the intensity of laser light is strong (light density is high). Further, the control device 13 controls the projector 1 by outputting a control signal for instructing the reduction of the laser beam to the projector 1 based on the determination result. That is, the control device 13 controls the intensity of the laser light projected by the projector 1 based on the determination result.

  The control device 13 determines whether or not the safety card 11 is located in a region adjacent to the region through which the laser light projected by the projector 1 passes and the distance from the region through which the laser light passes is shorter than a predetermined value. This may be determined, and based on the determination result, the projector 1 may be instructed to reduce the intensity of the laser beam.

  Although the projector 1 and the control device 13 are described as individual devices, they may be configured as one device.

  The communication device 14 includes, for example, a CPU or an embedded MPU, a dedicated IC, a clock generator, a real time clock, or the like. Further, the communication device 14 is output from its own (communication device 14) clock generator synchronized with a clock generator 46 of the safety card 11 and a clock generator of the control device 13, which will be described later with reference to FIG. Based on the clock, a predetermined signal is transmitted to the safety card 11 with a predetermined time difference from the control device 13.

  FIG. 2 is a diagram showing an example of the arrangement of the control device 13 and the communication device 14 in the room 31 using the display control system according to the present invention of FIG. In the room 31, the projector 1 equipped with the control device 13 can display (project) a predetermined image in the projection area 33 of the screen 32 by projecting, for example, laser light as projection light. It is arranged in the position. The communication device 14 is disposed at a predetermined location in the room 31, for example, near the wall of the room 31.

  In the room 31, a viewer (not shown) carrying the safety card 11 views an image displayed in the projection area 33 and a sound reproduced together with the image at a predetermined location.

  In the room 31 shown in FIG. 2, the safety card 11 is shown as being one, that is, only one viewer (not shown) carrying the safety card 11. When the viewer is in the room 31, the safety card 11 is distributed to each person, and each viewer carries the safety card 11.

  FIG. 3 is a block diagram illustrating an example of the configuration of the safety card 11. The safety card 11 includes a control unit 41, a ROM (Read Only Memory) 42, a RAM (Random Access Memory) 43, a receiving unit 44, a transmitting unit 45, a clock generator 46, and a GPS (Global Positioning System) receiving unit 47. The

  The control unit 41 is configured by a general-purpose CPU or an embedded MPU, and the program stored in the ROM 42, the program or data stored in the RAM 43 from the reception unit 44, or a drive mounted as necessary The entire safety card 11 is controlled according to a program stored in the control unit 41 (register thereof) or the RAM 43 from 51, and various processes are executed. The RAM 43 also appropriately stores data necessary for the control unit 41 to execute various processes. The ROM 42 stores a predetermined ID (IDentification) number that is identification information for identifying the safety card 11 for each safety card 11.

  The receiving unit 44 and the transmitting unit 45 are connected to an antenna (not shown), and the receiving unit 44 receives signals transmitted from the control device 13 and the communication device 14 via the antenna. The transmission unit 45 transmits information indicating the current position of the safety card 11 to the control device 13 via the antenna.

  The clock generator 46 synchronizes with a clock generator (not shown) of the control device 13 and the communication device 14 and supplies a clock (signal) or date / time (data) to the control unit 41.

  The GPS receiver 47 is connected to a GPS antenna (not shown), receives a GPS signal that is a signal transmitted from a GPS satellite, analyzes the GPS signal received by the GPS antenna, and determines the current time, safety card. 11 information on the current position (latitude, longitude, altitude, etc.) is calculated and acquired.

  The drive 51 is connected to the safety card 11 as necessary, and when a removable medium 52 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is mounted, the drive 51 is driven and recorded there. The program and data are supplied to the control unit 41 and the RAM 43.

  FIG. 4 is a block diagram illustrating an example of a functional configuration of the position specifying program 61 executed by the control unit 41 of the safety card 11. The position specifying program 61 is configured to include a reception control unit 71, a distance calculation unit 72, a position calculation unit 73, and a transmission control unit 74.

  The reception control unit 71 controls the reception unit 44 to control reception of signals transmitted from the control device 13 and the communication device 14. In addition, the reception control unit 71 supplies the received signal to the distance calculation unit 72. As a communication method in the control device 13, the communication device 14, and the safety card 11, for example, a CDMA (Code Division Multiple Access) communication method or a UWB (Ultra Wide Band) communication method can be used.

  Based on the date and time of the clock generator 46 and the signal supplied from the reception control unit 71, the distance calculation unit 72 has two distances, the distance between the safety card 11 and the control device 13 and the distance between the safety card 11 and the communication device 14. Is calculated. The distance calculation unit 72 supplies the calculated two distances to the position calculation unit 73.

  The position calculation unit 73 stores the positions of the control device 13 and the communication device 14 stored in advance, the distance between the safety card 11 and the control device 13 supplied from the distance calculation unit 72, and the safety card 11 and the communication device 14. Based on the distance, the current position (position on the two-dimensional coordinates) of the safety card 11 is calculated (specified). The position calculation unit 73 supplies information indicating the calculated current position of the safety card 11 to the transmission control unit 74.

  The transmission control unit 74 controls the transmission unit 45, information indicating the current position of the safety card 11 supplied from the position calculation unit 73 to the communication device 14, and identification information for identifying the safety card 11 (hereinafter, The transmission of the ID number which is called the identification information of the safety card 11 is controlled. Here, an ID number which is identification information of the safety card 11 is stored in the ROM 42 of the safety card 11.

  FIG. 5 is a block diagram illustrating an example of a functional configuration of the control device 13. The control device 13 is configured to include a transmission unit 91, a transmission control unit 92, a reception unit 93, a reception control unit 94, an identification information determination unit 95, an area determination unit 96, and a reduction instruction unit 97.

  The transmission unit 91 is a signal that includes the control information of the transmission control unit 92, the transmission time, and identification information for identifying the control device 13, and is a signal for calculating the distance between the control device 13 and the safety card 11. Is transmitted to the safety card 11.

  The transmission control unit 92 is synchronized with the safety card 11 and the communication device 14 and uses a clock generator (not shown) that outputs the date and time (data indicating), for example, to the safety card 11 by the transmission unit 91. The transmission of the signal configured to include the transmission time and the identification information for identifying the control device 13 is controlled. The transmission control unit 92 causes the transmission unit 91 to transmit a signal every predetermined time.

  The receiving unit 93 receives information indicating the current position (position on a two-dimensional coordinate) of the safety card 11 and identification information of the safety card 11 transmitted from the safety card 11 under the control of the reception control unit 94. To do.

  The reception control unit 94 controls reception of the information indicating the current position of the safety card 11 and the identification information of the safety card 11 transmitted from the safety card 11 by the reception unit 93. In addition, the reception control unit 94 supplies the received identification information of the safety card 11 to the identification information determination unit 95 and supplies information indicating the current position of the received safety card 11 to the area determination unit 96.

  The identification information determination unit 95 identifies the safety card 11 based on the identification information of the safety card 11 supplied from the reception control unit 94, that is, the ID number of the safety card 11 (the person carrying the safety card 11). Identify). For example, the safety card 11 identifies the viewer who views the image and sound displayed in the projection area 33 as the identification information of the safety card 11 and the manager who manages the projector 1 (the manager of the display control system). Therefore, when two types of identification information, that is, an ID number indicating a viewer and an ID number indicating an administrator are set, the identification information determination unit 95 determines that the identification information (ID number) of the safety card 11 is It is determined whether or not an administrator who manages the projector 1 is indicated. Further, the identification information determination unit 95 supplies the area determination unit 96 with a determination result as to whether or not the identification information of the safety card 11 indicates an administrator who manages the projector 1.

  Based on the current position of the safety card 11, the area determination unit 96 determines whether the current position of the safety card 11 is within an area in which light projected by the projector 1 is to be reduced and is within a predetermined area. Determine whether or not. The area determination unit 96 supplies the determination result to the reduction instruction unit 97.

  In addition, for example, the area determination unit 96 determines whether the identification information of the safety card 11 supplied from the identification information determination unit 95 indicates the administrator who manages the projector 1 or not. The current position, that is, the current position of the person (administrator or viewer) carrying the safety card 11 is in a light region (area) through which the projection light (laser light) projected by the projector 1 passes. It is determined whether or not it is an area (area) of intense light (high density light) that is dangerous for human irradiation. In addition, the area determination unit 96 has a strong intensity at which the current position of the person carrying the safety card 11 is within the area of the light projected by the projector 1 and is dangerous for human irradiation. The result of determination as to whether or not the area is a light area is supplied to the reduction instruction unit 97.

  When it is determined that the current position of the safety card 11 is within an area where the intensity of light projected by the projector 1 should be reduced, the reduction instruction unit 97 instructs the reduction of the intensity of light projected by the projector 1. .

  Further, for example, the reduction instruction unit 97 is a region (area) in which the current position of the person carrying the safety card 11 supplied from the area determination unit 96 is high in intensity of light projected by the projector 1 ( The projector 1 is instructed to reduce the intensity of the projection light (laser light) or to block the laser light based on the determination result indicating that it is a region of strong light that is dangerous for human irradiation.

  FIG. 6 is a block diagram illustrating an example of a functional configuration of the communication device 14. The communication device 14 is configured to include a transmission unit 111 and a transmission control unit 112.

  The transmission unit 111 is a signal including control information of the transmission control unit 112, transmission time, and identification information for identifying the communication device 14, and a signal for calculating the distance between the communication device 14 and the safety card 11. Is transmitted to the safety card 11.

  The transmission control unit 112 is separated from the control device 13 by a predetermined time (with a predetermined time difference) based on the clock of a clock generator (not shown) synchronized with the safety card 11 and the control device 13, and the transmission unit 111. The transmission of the signal including the transmission time to the safety card 11 and the identification information for identifying the communication device 14 is controlled. The transmission control unit 112 causes the transmission unit 111 to transmit a signal every predetermined time.

  Next, referring to the flowchart of FIG. 7, processing of the display control system by the safety card 11, the control device 13, and the communication device 14, signal transmission processing by the communication device 14, and reduction by the control device 13 Instruction processing and position specifying processing by the safety card 11 that executes the position specifying program 61 will be described. The processing of the display control system is repeatedly executed while the projector 1 displays a predetermined image (video) by projecting, for example, laser light onto the projection area 33 of the screen 32.

  Refer to FIG. 8 for explaining the distance between the safety card 11 and the communication device 14 and the distance between the safety card 11 and the control device 13, and FIG. 9 for explaining the danger area that is an area irradiated with strong light. The process will be described.

  In step S1, the transmission unit 111 of the communication device 14 causes the safety card 11 to calculate the distance between the safety card 11 and the communication device 14 (to the safety card 11) based on the control of the transmission control unit 112. Send. This signal includes, for example, identification information for identifying the communication device 14 and a transmission time at which the signal is transmitted.

  After the process of step S1, it returns to step S1 and repeats the process mentioned above for every predetermined period until the switch of the communication apparatus 14 is turned off.

  In step S31, the receiving unit 44 of the safety card 11 calculates the distance between the safety card 11 and the communication device 14 transmitted from the communication device 14 in the process of step S1 under the control of the reception control unit 71. Receive a signal.

  In step S51, the transmission unit 91 of the control device 13 calculates the distance between the safety card 11 and the control device 13 (projector 1) (to the safety card 11) to the safety card 11 under the control of the transmission control unit 92. Send a signal to make it happen. This signal includes, for example, identification information for identifying the control device 13 and a transmission time at which the signal is transmitted.

  The communication device 14 and the control device 13 are synchronized based on, for example, clocks output from respective clock generators (not shown). The process of step S1 by the communication device 14 and the process of step S51 by the control device 13 are executed with a predetermined time difference. That is, after the communication device 14 transmits a signal to the safety card 11 in the process of step S1, for example, 1 msec later, the control device 13 transmits a signal to the safety card 11 in the process of step S51.

  Here, a predetermined time (time difference) is provided between the signal transmission process by the communication device 14 in the process of step S1 and the signal transmission process by the control device 13 in the process of step S51. This is to prevent two signals transmitted by the control devices 13 from interfering with each other in the vicinity of the safety card 11. That is, for example, when the distance between the safety card 11 and the communication device 14 and the distance between the safety card 11 and the control device 13 are equal, the communication device 14 and the control device 13 simultaneously transmit respective signals to the safety card 11. This is to prevent the two signals from interfering with each other in the vicinity of the safety card 11 when the two signals arrive at the safety card 11 at the same time.

  This time difference is preferably as small as possible within a range in which this interference does not occur.

  In step S32, the receiving unit 44 of the safety card 11 calculates the distance between the safety card 11 and the control device 13 (projector 1) transmitted from the control device 13 by the processing in step S51 based on the control of the reception control unit 71. A signal for receiving is received.

  In step S33, the distance calculation unit 72 of the safety card 11 calculates the distance 151 (see FIG. 8) between the safety card 11 and the communication device 14 based on the signal received by the process of step S31. For example, the clock generator 46 of the safety card 11 and the clock generator (not shown) of the communication device 14 are synchronized, and the communication device 14 is connected to the safety card 11 and the distance between the safety card 11 and the communication device 14 at a predetermined time interval. When it is preset that a signal for calculating the signal is transmitted, the distance calculation unit 72 uses a predetermined clock output from the clock generator 46 of the safety card 11 as a reference signal, and how far from the clock that is the reference signal. That is, the time taken until the safety card 11 receives the signal transmitted by the communication device 14 synchronized with the clock from the clock that is the reference signal is calculated. The distance calculation unit 72 calculates the distance 151 between the safety card 11 and the communication device 14 shown in FIG. 8 by multiplying the calculated time by the speed of the signal recorded in advance on the safety card 11.

Specifically, for example, when the signal transmitted by the communication device 14 is received by the safety card 11 with a delay of 50 nsec (nano second) from the clock that is the reference signal output by the clock generator 46 of the safety card 11, 50 From × 10 ⁻⁹ (s) × 0.3 × 10 ⁹ (m / s), the distance 151 between the safety card 11 and the communication device 14 is 15 m. Here, the speed of the signal transmitted by the communication device 14 is assumed to be equal to the speed of light.

  In the process of step S33, the distance calculation unit 72 of the safety card 11 transmits the transmission included in the signal received by the process of step S31 when the transmission time is included in the signal received by the process of step S31. A difference between the time and the reception time when the safety card 11 receives the signal, that is, a signal for calculating the distance between the safety card 11 and the communication device 14 transmitted from the communication device 14 is received by the safety card 11. The distance 151 may be calculated on the basis of the time taken until the data is received and the speed of the signal (transmitted by the communication device 14) recorded in advance in the safety card 11 (= the speed of light).

  In step S34, the distance calculation unit 72 of the safety card 11 calculates the distance 152 (see FIG. 8) between the safety card 11 and the control device 13 (projector 1). That is, for example, as described above in the process of step S33, it takes until the safety card 11 receives the signal transmitted from the control device 13 from the clock that is the reference signal output from the clock generator 46 of the safety card 11. The distance 152 between the safety card 11 and the control device 13 shown in FIG. 8 is calculated based on the time and the speed of the signal (= the speed of light) recorded in advance in the safety card 11 (transmitted by the control device 13). Is done.

  Similar to the processing in step S33 described above, in the processing in step S34, the distance calculation unit 72 of the safety card 11 performs the processing in step S32 when the transmission time is included in the signal received in the processing in step S32. The difference between the transmission time included in the signal received by the process and the reception time when the safety card 11 received the signal, that is, the distance between the safety card 11 transmitted from the control device 13 and the control device 13 is calculated. The distance 152 is calculated based on the time taken for the safety card 11 to receive the signal for the safety card 11 and the speed (= light speed) of the signal (transmitted by the control device 13) recorded in the safety card 11 in advance. You may make it calculate.

  In step S <b> 35, the position calculation unit 73 of the safety card 11 calculates (specifies) the current position (position on the two-dimensional coordinates) of the safety card 11. For example, the position calculation unit 73 refers to the pre-stored position of the control device 13 and the position of the communication device 14 in step S35, and the safety calculated by the process of step S33 as shown in FIG. The distance 151 between the card 11 and the communication device 14 is the radius, the circle 161 centered on the communication device 14 and the distance 152 between the safety card 11 and the control device 13 calculated by the processing of step S34 are the radius. The current position of the safety card 11 is calculated based on a circle 162 centered on the control device 13 (projector 1). That is, the intersection of the circle 161 and the circle 162 is calculated (specified) as the current position of the safety card 11 (a position on a two-dimensional coordinate).

  In addition, although the intersection by the circle 161 and the circle 162 exists also outside the room 31, the direction (signal transmission range) of the signal transmitted by the control device 13 and the communication device 14 installed near the wall of the room 31 For example, the intersection of the circle 161 and the circle 162 outside the room 31 is excluded by making the inside of the room 31 only. Thus, the position of the safety card 11 at the intersection of the circle 161 and the circle 162, that is, the position of the person carrying the safety card 11 is the position of the safety card 11 shown in FIG. The position of the intersection that exists in

  In step S36, the transmission unit 45 of the safety card 11 controls the transmission control unit 74, information indicating the current position of the safety card 11 calculated by the process of step S35, and identification information of the safety card 11, that is, The ID number stored in the ROM 42 of the safety card 11 is transmitted to the control device 13.

  After the process of step S36, the procedure returns to step S31, and the above-described process is repeated.

  In step S52, the receiving unit 93 of the control device 13 transmits the information indicating the current position of the safety card 11 and the safety card 11 transmitted from the safety card 11 by the process of step S36 under the control of the reception control unit 94. Receive identification information (ID number).

  In step S53, the identification information determination unit 95 of the control device 13 determines whether or not the identification information of the safety card 11 indicates an administrator who manages the projector 1 (manages the display control system).

  In step S53, when it is determined that the identification information of the safety card 11 does not indicate the administrator who manages the projector 1, that is, the identification information (ID number) of the safety card 11 is displayed in the projection area 33. If the viewer is viewing the image, the process proceeds to step S54, where the area determination unit 96 of the control device 13 has the current position of the safety card 11 in an area where the intensity of light projected on the screen 32 is high, that is, It is determined whether or not it is an area of intense light that is dangerous for human irradiation. For example, it is determined whether or not it is within the danger area 171 shown in FIG. The dangerous area 171 includes a dangerous area 172.

  Here, an area where the intensity of light is high, that is, a dangerous area 171 which is an area of strong intensity where it is dangerous to irradiate a human, is light (laser light) projected to project an image from the projector 1. Is a region (area) through which the light (laser light) is strong (the light density is high) and is in the vicinity of the projector 1. Since the laser light projected from the projector 1 is projected on the entire screen 32, it spreads from the projector 1 at a certain angle. Therefore, it can be said that the area near the projector 1 has a large energy per area because the laser beam is not spread.

  In step S54, when it is determined that the current position of the safety card 11 is within an area where the intensity of light projected on the screen 32 is high (danger area 171), the intensity of the projected light (high output) ( In order to avoid (prevent) irradiation of a human with (laser light), the process proceeds to step S55, and the reduction instruction unit 97 of the control device 13 blocks the light (laser light) projected on the projection area 33 on the projector 1. Instruct. When the control device 13 instructs the projector 1 to block the projection light, the projector 1 blocks the projection light (laser light) by using a mechanical shutter or the like. Further, the projector 1 may reduce the projection light, which is laser light, to 0 by cutting off the power supplied to the laser light source.

  After the process of step S55, the process returns to step S51, and the above-described process is repeated until the control device 13 or the projector 1 is turned off.

  In step S54, when it is determined that the current position of the safety card 11 is not in an area where the intensity of light projected on the screen 32 is strong, that is, light projected from the projector 1 to project an image (laser light). ) Is a region that passes through and is a place other than the light region on the left side of the danger area 172 shown in FIG. 9 or the region through which the light projected by the projector 1 passes, the strong light is transmitted to humans. Since there is little risk of irradiation, there is no need to block the projection light or reduce the intensity of the light. Therefore, the procedure returns to step S51 without blocking the laser beam, and the control device 13 or the projector 1 switch is switched off. The process described above is repeated until turned off.

  If it is determined in step S53 that the identification information of the safety card 11 indicates an administrator who manages the projector 1, the process proceeds to step S56, where the area determination unit 96 of the control device 13 determines the current card of the safety card 11. It is determined whether or not the position is a danger area 172 in an area where the intensity of light projected on the screen 32 is higher. Here, the area with higher light intensity (danger area 172) is in the danger area 171 and is closer to the projector 1 and the intensity (density) of light (laser light) projected by the projector 1 is the highest. Indicates a strong (high) region.

  If it is determined in step S56 that the current position of the safety card 11 is in an area where the intensity of light projected on the screen 32 is higher (danger area 172), a person in the danger area 172 may be a projector. 1, since the danger area 172 is an area where the light intensity is the strongest, the process proceeds to step S <b> 57, and the reduction instruction unit 97 projects the light (laser light) projected onto the projection area 33 onto the projector 1. ) To reduce the strength. When the control device 13 instructs the projector 1 to reduce the intensity of the projection light, the projector 1 reduces the intensity of the projection light.

  Here, reducing the intensity of the projection light means, for example, reducing the output of a laser light source (not shown) of the projector 1 to a safe level. For example, by reducing the power supplied to the laser light source of the projector 1, the intensity of the projection light that is laser light is reduced.

  Further, for example, the intensity of the projected light may be reduced by lowering the level of the input video signal. For example, when an RGB (Red-Green-Blue) video signal is input, the intensity of the projected light may be reduced by lowering the level of the video signal.

  Note that the method of reducing the light intensity or blocking the light does not limit the present invention, and any method can be used.

  If it is determined in step S56 that the current position of the safety card 11 is not within the area where the intensity of light projected on the screen 32 is higher (danger area 172), that is, the safety card 11 is carried. Is the manager of the projector 1 and the manager is not in the danger area 172 with the strongest light intensity, it is not necessary to reduce the intensity of the laser light projected by the projector 1, so the procedure returns to step S51. The above-described processing is repeated until the control device 13 or the projector 1 is turned off.

  That is, even if the administrator who manages the projector 1 is in the danger area 171 except the danger area 172, it may be in the danger area 171 for the adjustment of the projector 1, so There is no blocking or reduction of the intensity of the projected light.

  The danger area 172 has the strongest laser light intensity projected by the projector 1 and is a dangerous area, so even if it is a manager of the projector 1, it is necessary to reduce the light intensity.

  In this way, the administrator can efficiently manage the projector 1 and can avoid danger.

  After the process in step S57, the procedure returns to step S51, and the above-described process is repeated until the control device 13 or the projector 1 is turned off.

  It should be noted that a person enters (invades) an area where the intensity of light (laser light) is strong in an area where light projected to project an image from the projector 1 passes, such as the danger area 171 and the danger area 172. Although it has been described that it is determined whether or not the user has entered the area where the person may enter (intrusion) into the area where the light intensity is high, that is, the current position of the person (the current position of the safety card 11). However, if the projector 1 is positioned within the area around the area through which the light projected to project an image is projected, a human may enter (intrude into) an area where the light intensity is high. Therefore, the light intensity projected by the projector 1 may be reduced or the light may be blocked.

  Further, the safety card 11 can also calculate the current position of the safety card 11 using the GPS receiver 47 as described above. That is, the safety card 11 transmits information indicating the current position of the safety card 11 calculated using the GPS receiving unit 47 to the control device 13 and is projected by the projector 1 without requiring the communication device 14. The light intensity can be reduced. As a result, the present invention can be applied not only indoors such as the room 31 but also in a wide outdoor venue.

  As described above, the present invention can also be applied to a room, a predetermined infrastructure, and a theater where a projector image can be viewed.

  Further, based on the identification information of the safety card 11, that is, the ID number stored in the ROM 42, the person carrying the safety card 11 can be identified. In addition, since it is human beings who carry the safety card 11, there is no danger to human beings due to the invasion of non-human (animals and garbage) into areas where the light intensity is strong. It is possible to prevent the laser power from being reduced. That is, it is possible to prevent malfunctions other than human beings.

  Furthermore, since the current position (coordinates) of the safety card 11 can be calculated and specified, a person carrying the safety card 11 even in a large theater or outdoors, regardless of the distance from the projector 1. However, it is possible to reliably determine whether or not it is in a dangerous area with high light intensity or in the vicinity of the dangerous area. Accordingly, it is possible to more reliably detect a person who is in a place where it is necessary to reduce the intensity of light projected on the screen, and to prevent irradiation of the person with strong light.

  The communication method between the control device 13 and the communication device 14 and the safety card 11 is sufficient if the distance between the safety card 11 and the control device 13 and the distance between the safety card 11 and the communication device 14 can be calculated. The communication is not limited to the method and the UWB communication method, but may be performed using another communication method.

  Furthermore, two or more communication devices 14 may be installed in the room 31. That is, the safety card 11 calculates the distance between the safety card 11 and the control device 13 and the distance between the safety card 11 and two or more communication devices 14, and based on the three or more distances, the safety card 11 The current position may be calculated. At this time, naturally, the control device 13 and two or more (all) communication devices 14 synchronize and transmit a predetermined signal to the safety card 11.

  Thus, by providing a plurality of communication devices 14, that is, for example, by providing two communication devices 14, safety can be achieved based on the three distances between the control device 13 and the two communication devices 14 and the safety card 11. By calculating the current position of the card 11, the position of the safety card 11 can be specified more accurately. That is, the position of a person (carrying the safety card 11) can be specified more accurately. By more accurately specifying the current position of the human, it is possible to accurately determine whether the human is in the region of strong light, and the human is irradiated with the strong light projected by the projector 1. Can be prevented.

  As described above, when the position of the person carrying the safety card 11 is accurately detected and the position is within a region where the intensity of light is high, the intensity of light projected by the projector 1 is reduced or the light is blocked. The human position can be accurately detected without the need for a large and expensive device such as a device that is executed and illuminates a powerful infrared ray or an ultra-sensitive camera. Therefore, it is possible to more reliably prevent the human being from being irradiated with strong light by using a smaller and cheaper device without causing malfunctions to non-human beings.

  In this way, when the safety card 11, the control device 13, and the communication device 14 communicate with each other, data can be transmitted and received. When the human position is calculated and detected, the current position of the human can be accurately detected. The portable information processing apparatus transmits from the communication apparatus, the first wireless signal for calculating the first distance between the portable information processing apparatus and the communication apparatus, and the portable information processing transmitted from the display apparatus. A second radio signal for calculating a second distance between the device and the display device is received, a first distance is calculated based on the first radio signal, and a second radio signal is calculated based on the second radio signal. And calculating a position on the plane of the portable information processing apparatus based on the first distance and the second distance, and displaying a third wireless signal indicating the position on the plane of the portable information processing apparatus And the communication device transmits a first wireless signal for calculating a first distance between the portable information processing device and the communication device to the portable information processing device, and the display device is the portable information processing device. A second wireless signal for calculating a second distance between the display device and the display device. The third wireless signal transmitted to the information processing apparatus and transmitted from the portable information processing apparatus and indicating the position on the plane of the portable information processing apparatus is received. If it is within the area of the light projected to display the image or the area around the area of the light, and if an instruction to reduce the intensity of the light to display the image is given, the Without activation, it is possible to more reliably prevent strong light from being projected onto humans.

  Next, another embodiment of the present invention will be described with reference to FIGS. In addition, hereinafter, FIGS. 3, 8, and 9 described above will be appropriately cited and described.

  FIG. 10 illustrates another example of the embodiment of the display control system according to the present invention. 10, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and description of the parts corresponding to FIG.

  The projector 1 shown in FIG. 10 displays (projects) a predetermined image on the screen 32 described above with reference to FIG. 2 by projecting, for example, laser light as light to be projected to project an image. .

  A viewer who views the image projected by the projector 1 and the sound reproduced together with the image carries the safety card 11 provided with the string 12.

  The safety card 11 is an IC tag that performs communication processing using microwaves or predetermined light, and transmits a predetermined signal to the control device 13 and the communication device 14. The safety card 11 is synchronized with a clock generator (not shown) of the control device 13 and a clock generator (not shown) of the communication device 14, for example, from the clock generator 46 (see FIG. 3) of its own (safety card 11). Based on the output clock, a predetermined signal is transmitted to the control device 13 and the communication device 14 every predetermined time.

  The communication device 14 receives the signal transmitted from the safety card 11 and calculates the distance between the safety card 11 and the communication device 14 based on the received signal. Further, the communication device 14 transmits information indicating the calculated distance between the safety card 11 and the communication device 14 to the control device 13.

  The control device 13 is provided in the projector 1 and includes, for example, a CPU or a built-in MPU, a dedicated IC, a clock generator, a real-time clock, or the like. The control device 13 receives a signal transmitted from the safety card 11 and information indicating the distance between the safety card 11 and the communication device 14 transmitted from the communication device 14. The control device 13 calculates the distance between the safety card 11 and the control device 13 (projector 1) based on the signal transmitted from the safety card 11. The control device 13 calculates (specifies) the current position of the safety card 11 based on the calculated distance between the safety card 11 and the control device 13 and the received distance between the safety card 11 and the communication device 14.

  For example, the control device 13 is a two-dimensional coordinate having the control device 13 (projector 1) as the origin, and the safety card 11 on the coordinates determined based on the positions of the control device 13, the communication device 14, and the screen 32. Calculate the position.

  Furthermore, the control device 13 instructs the projector 1 to reduce the laser light projected by the projector 1 based on the information indicating the current position of the calculated (specified) safety card 11. More specifically, the control device 13 determines whether or not the current position of the safety card 11 is in a region (area) where the intensity of laser light is strong (light density is high). Further, the control device 13 controls the projector 1 by outputting a control signal instructing reduction of the laser light to the projector 1 based on the determination result. That is, the control device 13 controls the intensity of the laser light projected by the projector 1 based on the determination result.

  The control device 13 determines whether or not the safety card 11 is located in a region adjacent to the region through which the laser light projected by the projector 1 passes and the distance from the region through which the laser light passes is shorter than a predetermined value. This may be determined, and based on the determination result, the projector 1 may be instructed to reduce the intensity of the laser beam.

  Moreover, since the example of arrangement | positioning of the control apparatus 13, the communication apparatus 14, and the screen 32 is the same as the example of arrangement | positioning mentioned above with reference to FIG. 2, the description is abbreviate | omitted.

  The configuration of the safety card 11 is the same as that described above with reference to FIG.

  FIG. 11 is a block diagram illustrating an example of a functional configuration of the signal transmission program 251 executed by the control unit 41 of the safety card 11. The signal transmission program 251 is configured to include a transmission control unit 261.

  The transmission control unit 261 is synchronized with the control device 13 and the communication device 14 and uses a clock generator 46 (not shown) that outputs the date and time (data indicating), for example, the control device 13 by the transmission unit 45, for example. And a signal including an ID number stored in the ROM 42 (see FIG. 3) which is the transmission time to the communication device 14 and the identification information of the safety card 11, and is transmitted to the control device 13 and the communication device 14. Control transmission to calculate distance. The transmission control unit 261 causes the transmission unit 45 to transmit a signal every predetermined time.

  As a communication method in the control device 13, the communication device 14, and the safety card 11, for example, a CDMA communication method or a UWB communication method can be used.

  FIG. 12 is a block diagram illustrating another example of the functional configuration of the communication device 14. The communication device 14 is configured to include a reception unit 281, a reception control unit 282, a distance calculation unit 283, a transmission control unit 284, and a transmission unit 285.

  The receiving unit 281 receives a signal for calculating the distance from the safety card 11 transmitted from the safety card 11 under the control of the reception control unit 282.

  The reception control unit 282 controls reception of a signal transmitted from the safety card 11 for calculating the distance to the safety card 11 by the reception unit 281. The reception control unit 282 also supplies the received signal to the distance calculation unit 283.

  The distance calculation unit 283 calculates the distance between the safety card 11 and the communication device 14 based on the signal supplied from the reception control unit 282 in the same process as the distance calculation unit 72. The distance calculation unit 283 supplies the calculated distance between the safety card 11 and the communication device 14 to the transmission control unit 284.

  The transmission control unit 284 controls transmission of information indicating the distance between the safety card 11 and the communication device 14 to the control device 13 by the transmission unit 285.

  The transmission unit 285 transmits information indicating the distance between the safety card 11 and the communication device 14 to the control device 13 under the control of the transmission control unit 284.

  FIG. 13 is a block diagram illustrating another example of the functional configuration of the control device 13. The control device 13 is configured to include a reception unit 301, a reception control unit 302, a distance calculation unit 303, a position calculation unit 304, an identification information determination unit 95, an area determination unit 96, and a reduction instruction unit 97. In FIG. 13, parts corresponding to those in FIG. 5 are denoted by the same reference numerals, and description of the parts corresponding to FIG.

  The reception unit 301 communicates with the safety card 11 transmitted from the communication device 14 and the signal for calculating the distance to the safety card 11 transmitted from the safety card 11 under the control of the reception control unit 302. Information indicating the distance to the device 14 is received.

  The reception control unit 302 receives a signal for calculating the distance from the safety card 11 transmitted from the safety card 11 by the reception unit 301, and between the safety card 11 and the communication device 14 transmitted from the communication device 14. Controls reception of information indicating distance. Further, the reception control unit 302 supplies a signal for calculating the distance from the safety card 11 transmitted from the safety card 11 to the distance calculation unit 303, and the safety card 11 transmitted from the communication device 14. The distance to the communication device 14 is supplied to the position calculation unit 304, and the identification information (ID number) of the safety card 11 included in the signal transmitted from the safety card 11 is supplied to the identification information determination unit 95.

  The distance calculation unit 303 calculates the distance between the safety card 11 and the control device 13 (projector 1) based on the signal supplied from the reception control unit 302 in the same process as the distance calculation unit 72. The distance calculation unit 303 supplies the calculated distance between the safety card 11 and the control device 13 to the position calculation unit 304.

  The position calculation unit 304 is processed in the same manner as the position calculation unit 73, and the positions of the control device 13 and the communication device 14 stored in advance and the distance between the safety card 11 supplied from the reception control unit 302 and the communication device 14. Based on the distance between the safety card 11 and the control device 13 supplied from the distance calculation unit 303, the current position (position on the two-dimensional coordinates) of the safety card 11 is calculated (specified). Further, the position calculation unit 304 supplies information indicating the calculated current position of the safety card 11 to the area determination unit 96.

  Referring to the flowchart of FIG. 14, processing of signal transmission by the safety card 11 executing the signal transmission program 251, which is processing of the display control system by the safety card 11, the control device 13, and the communication device 14, the communication device 14 will be described, and processing for reduction instruction by the control device 13 will be described. The processing of the display control system is repeatedly executed while the projector 1 displays a predetermined image (video) on the screen 32 by projecting, for example, laser light onto the projection area 33 of the screen 32.

  Refer to FIG. 8 for explaining the distance between the safety card 11 and the communication device 14 and the distance between the safety card 11 and the control device 13, and FIG. 9 for explaining the danger area that is an area irradiated with strong light. The process will be described.

  In step S <b> 101, the transmission unit 45 of the safety card 11 transmits a signal for calculating the distance to the safety card 11 to the communication device 14 and the control device 13 under the control of the transmission control unit 261. This signal includes, for example, an ID number which is identification information of the safety card 11 and a transmission time when the signal is transmitted.

  After the process of step S101, the procedure returns to step S101, and the above-described process is repeated for each predetermined period until the safety card 11 is turned off.

  In step S131, the receiving unit 281 of the communication device 14 receives a signal for calculating the distance from the safety card 11 transmitted from the safety card 11 by the processing in step S101 under the control of the reception control unit 282. To do.

  In step S151, the reception unit 301 of the control device 13 receives a signal for calculating the distance from the safety card 11 transmitted from the safety card 11 by the processing in step S101 under the control of the reception control unit 302. .

  In step S132, the distance calculation unit 283 of the communication device 14 calculates the distance 151 (see FIG. 8) between the safety card 11 and the communication device 14 based on the signal received by the process of step S131. For example, the clock generator 46 of the safety card 11 and the clock generator (not shown) of the communication device 14 are synchronized, and the safety card 11 causes the communication device 14 to calculate the distance from the safety card 11 at a predetermined time interval. , That is, a signal for calculating the distance between the safety card 11 and the communication device 14 is preset, the distance calculation unit 283 outputs a clock generator (not shown) of the communication device 14. The communication device 14 receives a signal transmitted by the safety card 11 synchronized with the clock from the clock that is the reference signal, that is, how much the clock is delayed from the clock that is the reference signal. Calculate the time it took until. The distance calculation unit 283 calculates the distance 151 between the safety card 11 and the communication device 14 shown in FIG. 8 by multiplying the calculated time by the speed of the signal recorded in the communication device 14 in advance.

Specifically, for example, when a signal transmitted from the safety card 11 is received by the communication device 14 with a delay of 50 nsec (nano second) from a clock that is a reference signal output from a clock generator (not shown) of the communication device 14. , 50 × 10 ⁻⁹ (s) × 0.3 × 10 ⁹ (m / s), the distance 151 between the safety card 11 and the communication device 14 is 15 m. Here, the speed of the signal transmitted by the safety card 11 is assumed to be equal to the speed of light.

  In the process of step S132, the distance calculation unit 283 of the communication device 14 includes the transmission included in the signal received by the process of step S131 when the transmission time is included in the signal received by the process of step S131. The difference between the time and the reception time when the communication device 14 receives the signal, that is, until the communication device 14 receives a signal transmitted from the safety card 11 for calculating the distance to the safety card 11. The distance 151 may be calculated based on the time taken and the speed of the signal (transmitted by the safety card 11) recorded in the communication device 14 in advance (= the speed of light).

  In step S133, the transmission unit 285 of the communication device 14 sends the information indicating the distance 151 between the safety card 11 and the communication device 14 calculated by the process of step S132 to the control device 13 based on the control of the transmission control unit 284. Send.

  After the process of step S133, the procedure returns to step S131, and the above-described process is repeated until the communication device 14 is turned off.

  In step S152, the receiving unit 301 of the control device 14 receives information indicating the distance 151 between the safety card 11 and the communication device 14 transmitted from the communication device 14 by the process of step S133 under the control of the reception control unit 302. Receive.

  In step S153, the distance calculation unit 303 of the control device 13 calculates the distance 152 between the safety card 11 and the control device 13 (projector 1). That is, for example, as described above in the process of step S132, until the control device 13 receives a signal transmitted by the safety card 11 from a clock that is a reference signal output from a clock generator (not shown) of the control device 13. A distance 152 between the safety card 11 and the control device 13 shown in FIG. 8 based on the time taken and the speed of the signal (= the speed of light) recorded in the control device 13 in advance (transmitted by the safety card 11). Is calculated.

  Similar to the process of step S132 described above, in the process of step S153, the distance calculation unit 303 of the safety card 11 performs the process of step S151 when the transmission time is included in the signal received by the process of step S151. A signal for calculating the difference between the transmission time included in the signal received by the processing and the reception time when the control device 13 received the signal, that is, the distance from the safety card 11 is calculated. The distance 152 is calculated based on the time taken for reception by the control device 13 and the speed of the signal (transmitted by the safety card 11) previously recorded in the control device 13 (= speed of light). May be.

  In step S154, the position calculation unit 304 of the control device 13 calculates (specifies) the current position (position on the two-dimensional coordinates) of the safety card 11. For example, in step S154, the position calculation unit 304 sets the distance 151 between the safety card 11 and the communication device 14 received by the processing in step S152 as a radius and the communication device 14 as the center, as shown in FIG. And the distance 152 between the safety card 11 calculated by the processing of step S153 and the control device 13 is a radius, and the safety card 11 is based on the circle 162 centered on the control device 13 (projector 1). Calculate the current position of. That is, the intersection of the circle 161 and the circle 162 is calculated (specified) as the current position of the safety card 11 (a position on a two-dimensional coordinate).

  As shown in FIG. 8, there is an intersection of a circle 161 and a circle 162 outside the room 31, but as described above, for example, the control device 13 (projector 1) is set to the origin in the room 31. And the position of the safety card 11 on the coordinates determined based on the positions of the control device 13, the communication device 14, and the screen 32 is calculated, that is, the position outside the room 31, that is, The intersection of the circle 161 and the circle 162 outside the room 31 is excluded, and the position of the safety card 11 at the intersection of the circle 161 and the circle 162 in the room 31, that is, the person carrying the safety card 11 The position is the position of the safety card 11 shown in FIG.

  Since the processes in steps S155 to S159 are the same as the processes in steps S53 to S57 described above with reference to FIG. 7, the description thereof is omitted.

  In step S156, the area determination unit 96 of the control device 13 determines that the current position of the safety card 11 is not an area with a high intensity of light projected on the screen 32 (danger area 171 shown in FIG. 9). If so, the procedure returns to step S151, and the above-described processing is repeated until the control device 13 or the projector 1 is turned off.

  Further, after the process of step S157, the procedure returns to step S151, and the above-described process is repeated until the control device 13 or the projector 1 is turned off.

  In step S158, the area determination unit 96 of the control device 13 determines that the current position of the safety card 11 is not an area with a higher intensity of light projected on the screen 32 (danger area 172 shown in FIG. 9). In this case, the procedure returns to step S151, and the above-described processing is repeated until the control device 13 or the projector 1 is turned off.

  Further, after the process of step S159, the procedure returns to step S151, and the above-described process is repeated until the control device 13 or the projector 1 is turned off.

  It should be noted that a person enters (invades) an area where the intensity of light (laser light) is strong in an area where light projected to project an image from the projector 1 passes, such as the danger area 171 and the danger area 172. Although it has been described that it is determined whether or not the user has entered the area where the person may enter (intrusion) into the area where the light intensity is high, that is, the current position of the person (the current position of the safety card 11). However, if the projector 1 is positioned within the area around the area through which the light projected to project an image is projected, a human may enter (intrude into) an area where the light intensity is high. Therefore, the light intensity projected by the projector 1 may be reduced or the light may be blocked.

  As described above, the present invention can also be applied to a room, a predetermined infrastructure, and a theater where a projector image can be viewed.

  In the embodiment described with reference to FIGS. 10 to 14, the person carrying the safety card 11 is identified based on the identification information of the safety card 11, that is, the ID number stored in the ROM 42. Can be identified. In addition, since it is human beings who carry the safety card 11, there is no danger to human beings due to the invasion of non-human (animals and garbage) into areas where the light intensity is strong. It is possible to prevent the laser power from being reduced. That is, it is possible to prevent malfunctions other than human beings.

  Furthermore, since the current position (coordinates) of the safety card 11 can be calculated and specified, a person carrying the safety card 11 even in a large theater or outdoors, regardless of the distance from the projector 1. However, it is possible to reliably determine whether or not it is in a dangerous area with high light intensity or in the vicinity of the dangerous area. Accordingly, it is possible to more reliably detect a person who is in a place where it is necessary to reduce the intensity of light projected on the screen, and to prevent irradiation of the person with strong light.

  The communication method between the control device 13 and the communication device 14 and the safety card 11 is sufficient if the distance between the safety card 11 and the control device 13 and the distance between the safety card 11 and the communication device 14 can be calculated. The communication is not limited to the method and the UWB communication method, but may be performed using another communication method.

  Furthermore, two or more communication devices 14 may be installed in the room 31. That is, the safety card 11 transmits a signal for calculating the distance from the safety card 11 to the control device 13 and the two or more communication devices 14, and the control device 13 communicates between the safety card 11 and the control device 13. The two or more communication devices 14 calculate the distance, and each communication device 14 calculates the distance between the safety card 11 and itself (individual communication device 14), and based on the three or more distances, The control device 13 may calculate the current position of the safety card 11. At this time, naturally, the safety card 11, the control device 13 and two or more (all) communication devices 14 are synchronized, and the safety card 11 is synchronized with the control device 13 and two or more (all) communication devices 14. A predetermined signal is transmitted.

  Thus, by providing a plurality of communication devices 14, that is, for example, by providing two communication devices 14, safety can be achieved based on the three distances between the control device 13 and the two communication devices 14 and the safety card 11. By calculating the current position of the card 11, the position of the safety card 11 can be specified more accurately. That is, the position of a person (carrying the safety card 11) can be specified more accurately. By more accurately specifying the current position of the human, it is possible to accurately determine whether the human is in the region of strong light, and the human is irradiated with the strong light projected by the projector 1. Can be prevented.

  As described above, also in the embodiment described with reference to FIGS. 10 to 14, the position of the person carrying the safety card 11 is accurately detected, and the position is within the region where the light intensity is strong. In addition, the intensity of the light projected by the projector 1 is reduced or the light is blocked, and a large and expensive device such as a device that illuminates a powerful infrared ray or an ultra-sensitive camera is not required. The human position can be accurately detected. Therefore, it is possible to more reliably prevent the human being from being irradiated with strong light by using a smaller and cheaper device without causing malfunctions to non-human beings.

  In this way, when the safety card 11, the control device 13, and the communication device 14 communicate with each other, data can be transmitted and received. When the human position is calculated and detected, the current position of the human can be accurately detected. The portable information processing apparatus transmits a first wireless signal for calculating the distance from the portable information processing apparatus to the communication apparatus and the display apparatus, and the communication apparatus is transmitted from the portable information processing apparatus. The first wireless signal is received, the first distance between the portable information processing device and the communication device is calculated based on the first wireless signal, and the second wireless signal indicating the first distance is transmitted to the display device. The display device receives the first wireless signal transmitted from the portable information processing device and the second wireless signal indicating the first distance between the portable information processing device and the communication device transmitted from the communication device. The second distance between the portable information processing device and the display device is calculated based on the first wireless signal, and the position on the plane of the portable information processing device is calculated based on the first distance and the second distance. The position on the plane of the portable information processing device is displayed. Therefore, if it is in the area of the projected light or in the area around the area of the light, if it is instructed to reduce the intensity of the light for displaying the image, it will cause a malfunction to anything other than human beings. Without causing it, it is possible to prevent the projection of strong light to humans more reliably.

  Next, still another embodiment of the present invention will be described with reference to FIGS. Hereinafter, FIGS. 3, 4, and 6 described above will be cited and described as appropriate.

  FIG. 15 is a diagram illustrating an example of the arrangement of the safety cards 401-1 to 401-4, the control device 13, and the communication device 14 in the room 31 using the display control system according to the present invention. In FIG. 15, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and description of the parts corresponding to FIG.

  A safety card 401-1 and a safety card 401-2 are provided at the upper left and right corners of the screen 32, respectively. As shown in FIG. 16, safety cards 401-1 to 401-4 are provided at the four corners of the screen 32.

  Since each of the safety cards 401-1 to 401-4 is configured in the same manner as the safety card 11 described above, the description thereof is omitted. Further, the configuration of the safety card 11 shown in FIGS. 3 and 4 is appropriately referred to as the configuration of each of the safety cards 401-1 to 401-4.

  Each of the safety cards 401-1 to 401-4 is an IC tag that performs communication processing using microwaves or predetermined light, and a predetermined signal transmitted from the control device 13 and the communication device 14 with a predetermined time difference. Receive. Each of the safety cards 401-1 to 401-4 is connected to each of the safety cards 401-1 to 401-4 and the control device 13 (projector 1) based on signals transmitted from the control device 13 and the communication device 14. ) And the distance between each of the safety cards 401-1 to 401-4 and the communication device 14, and calculates (specifies) the current position of itself (each of the safety cards 401-1 to 401-4) To do. Further, each of the safety cards 401-1 to 401-4 transmits information indicating its own current position to the control device 13.

  To explain redundantly, for example, the safety card 401-1 is based on the signals transmitted from the control device 13 and the communication device 14, and the distance and safety between the safety card 401-1 and the control device 13 (projector 1). The distance between the card 401-1 and the communication device 14 is calculated, and the current position of the user (safety card 401-1) is calculated (specified). Further, the safety card 401-1 transmits information indicating its own current position to the control device 13.

  Further, for example, each of the safety cards 401-1 to 401-4 is a two-dimensional coordinate having the control device 13 (projector 1) as an origin, and the positions of the control device 13, the communication device 14, and the screen 32 are indicated. It calculates the position of itself (each of the safety cards 401-1 to 401-4) on the base coordinates.

  For example, the control device 13 synchronizes with the clock generator 46 of each of the safety cards 401-1 to 401-4 and the clock generator of the communication device 14, and uses the clock output from its own (control device 13) clock generator. Based on the transmission of the signal of the communication device 14 based on a predetermined time (with a predetermined time difference), the predetermined signal is transmitted to each of the safety cards 401-1 to 401-4.

  Further, the control device 13 sends a screen to the projector 1 based on information indicating the current position of each of the safety cards 401-1 to 401-4 transmitted from each of the safety cards 401-1 to 401-4. Allow (instruct) the projection of the laser beam to 32. More specifically, the control device 13 determines whether the current positions of the safety cards 401-1 to 401-4 are in the direction in which the projector 1 projects laser light (the direction of the screen 32). To do. Further, the control device 13 outputs a control signal for permitting the projection of the laser light to the projector 1 based on the determination result, and controls the laser projection of the projector 1. That is, based on the determination result, the control device 13 instructs the projector 1 to permit or disallow the laser light projection (cut off the laser light).

  For example, the communication device 14 synchronizes with the clock generator 46 of each of the safety cards 401-1 to 401-4 and the clock generator of the control device 13, and uses the clock output from its own (communication device 14) clock generator. Based on this, a predetermined signal is transmitted to each of the safety cards 401-1 to 401-4 with a predetermined time difference from the control device 13.

  Hereinafter, the safety cards 401-1 to 401-4 are simply referred to as safety cards 401 when it is not necessary to distinguish them individually.

  FIG. 17 is a block diagram illustrating another example of the functional configuration of the control device 13. The control device 13 is configured to include a transmission unit 91, a transmission control unit 92, a reception unit 93, a reception control unit 94, a determination unit 411, and a projection permission unit 412. In FIG. 17, the same reference numerals are given to the portions corresponding to FIG. 5, and the description of the portions corresponding to FIG.

  The reception control unit 94 controls reception of information indicating the current position of the safety card 401 and identification information of the safety card 401 transmitted from the safety card 401 by the reception unit 93. In addition, the reception control unit 94 supplies the received identification information of the safety card 401 and information indicating the current position of the safety card 401 (a position on a two-dimensional coordinate) to the determination unit 411.

  The determination unit 411 identifies the safety card 401 based on the identification information of the safety card 401 supplied from the reception control unit 94, that is, the ID number of the safety card 401, and identifies all the safety cards 401 (safety cards 401-1). Through 401-4), it is determined whether or not the identification information (ID number) has been received. Further, when the determination unit 411 determines that the identification information of all the safety cards 401 has been received, based on the information indicating the current positions (coordinates) of all the safety cards 401, the determination unit 411 It is determined whether or not the position is within a predetermined range (distance). The determination unit 411 supplies the projection permission unit 412 with a determination result as to whether or not all safety cards 401 are within a predetermined range (distance).

  The projection permission unit 412 permits the projection of the laser light when the determination unit 411 supplies a determination result indicating that the current positions of all the safety cards 401 are within a pre-recorded range (distance). By supplying a control signal to be instructed (instructed) to the projector 1, the projector 1 is allowed (instructed) to project laser light for displaying an image (project the laser light).

  Since the functional configuration of the communication device 14 is the same as the configuration with reference to FIG. 6, the description thereof is omitted.

  With reference to the flowchart of FIG. 18, the signal transmission process by the communication device 14, the position information and identification information reception process by the control device 13, and the position specification by the safety card 401 that executes the position specification program 61 are performed. Processing will be described. This process is started when the user turns on a switch that instructs the projector 1 to project light (image). Further, this process is repeatedly executed while a predetermined image (video) is displayed on the screen 32 by the projector 1 projecting laser light.

  The processing will be described with reference to FIG. 19 for explaining the distance between the safety card 401 and the communication device 14 and the distance between the safety card 401 and the control device 13.

  In step S301, the transmission unit 111 of the communication apparatus 14 communicates with each of the safety cards 401-1 to 401-4 to each of the safety cards 401-1 to 401-4 under the control of the transmission control unit 112. 14 is transmitted to each of the safety cards 401-1 to 401-4. This signal includes, for example, identification information for identifying the communication device 14 and a transmission time at which the signal is transmitted.

  After the process of step S301, the process returns to step S1, and the above-described process is repeated for each predetermined period until the switch of the communication device 14 is turned off.

  In step S331, the receiving units 44 of the safety cards 401-1 to 401-4 are controlled by the reception control units 71 of the safety cards 401-1 to 401-4, and the communication device 14 in the process of step S301. The signal for calculating the distance between each of the safety cards 401-1 to 401-4 transmitted from the communication device 14 is received.

  In step S351, the transmission unit 91 of the control device 13 controls each of the safety cards 401-1 to 401-4 and the control device to each of the safety cards 401-1 to 401-4 based on the control of the transmission control unit 92. 13 (projector 1) is transmitted a signal for calculating the distance (to safety card 401). This signal includes, for example, identification information for identifying the control device 13 and a transmission time at which the signal is transmitted.

  The communication device 14 and the control device 13 are synchronized based on, for example, clocks output from respective clock generators (not shown). The processing in step S301 by the communication device 14 and the processing in step S351 by the control device 13 are executed with a predetermined time difference. That is, after the communication device 14 transmits a signal to each of the safety cards 401-1 to 401-4 in the process of step S 301, for example, 1 msec later, the control device 13 performs the safety card 401-in the process of step S 351. A signal is transmitted to each of 1 to 401-4.

  Here, a predetermined time (time difference) is provided between the signal transmission process by the communication device 14 in the process of step S301 and the signal transmission process by the control device 13 in the process of step S351. This is to prevent two signals transmitted by the control devices 13 from interfering with each other in the vicinity of the safety card 401. That is, for example, when the distance between the safety card 401-1 and the communication device 14 and the distance between the safety card 401-1 and the control device 13 are equal, the communication device 14 and the control device 13 simultaneously send the respective signals to the safety card 401. This is to prevent the two signals from interfering with each other in the vicinity of the safety card 401-1 by transmitting the signal to -1 and arriving at the safety card 401-1 at the same time.

  This time difference is preferably as small as possible within a range in which this interference does not occur.

  In step S332, the receiving units 44 of the safety cards 401-1 to 401-4 are controlled by the reception control unit 71, and the safety card 401 and the control device 13 ( A signal for calculating the distance to the projector 1) is received.

  In step S333, each distance calculation unit 72 of the safety cards 401-1 to 401-4 and each of the safety cards 401-1 to 401-4 and the communication device 14 based on the signal received by the process of step S 331. A distance 421 (see FIG. 19) is calculated. For example, the clock generator 46 of the safety card 401-1 and the clock generator (not shown) of the communication device 14 are synchronized, and the communication device 14 is connected to the safety card 401-1 and the safety card 401-1 at a predetermined time interval. When transmission of a signal for calculating the distance to the communication device 14 is preset, the distance calculation unit 72 uses a predetermined clock output from the clock generator 46 of the safety card 401-1 as a reference signal, Calculate how much time is delayed from the clock that is the reference signal, that is, the time taken for the safety card 401-1 to receive the signal transmitted by the communication device 14 synchronized with the clock from the clock that is the reference signal. To do. The distance calculation unit 72 multiplies the calculated time by the speed of the signal recorded in advance on the safety card 401-1 to thereby determine the distance 421 between the safety card 401-1 and the communication device 14 shown in FIG. Is calculated.

Specifically, for example, the signal transmitted from the communication device 14 is received by the safety card 401-1 with a delay of 50 nsec (nano second) from the clock that is the reference signal output from the clock generator 46 of the safety card 401-1. In this case, the distance 421 between the safety card 401-1 and the communication device 14 is 15 m from 50 × 10 ⁻⁹ (s) × 0.3 × 10 ⁹ (m / s). Here, the speed of the signal transmitted by the communication device 14 is assumed to be equal to the speed of light.

  In the process of step S333, the distance calculation unit 72 of each of the safety cards 401-1 to 401-4 performs the process of step S 331 when the transmission time is included in the signal received by the process of step S 331. The difference between the transmission time included in the received signal and the reception time when the safety card 401 received the signal, that is, the distance between the safety card 401 transmitted from the communication device 14 and the communication device 14 is calculated. The distance 421 is calculated based on the time taken for the signal to be received by the safety card 401 and the speed (= speed of light) of the signal (transmitted by the communication device 14) recorded in advance on the safety card 401. You may do it.

  In step S334, the respective distance calculation units 72 of the safety cards 401-1 to 401-4 are distances 422 (see FIG. 19) between each of the safety cards 401-1 to 401-4 and the control device 13 (projector 1). Is calculated. That is, for example, the safety card 401-1 receives the signal transmitted from the control device 13 from the clock that is the reference signal output from the clock generator 46 of the safety card 401-1, as described above in the process of step S 333. 19 and the safety card 401-1 shown in FIG. 19 and the control based on the signal speed (= light speed) recorded in advance in the safety card 401-1 (transmitted by the control device 13). A distance 422 from the device 13 is calculated.

  Similar to the processing in step S333 described above, in the processing in step S334, the distance calculation unit 72 of the safety card 401 includes the transmission time in the signal received in the processing in step S332. The difference between the transmission time included in the signal received by the processing and the reception time when the safety card 401 received the signal, that is, the distance between the safety card 401 transmitted from the control device 13 and the control device 13 is calculated. The distance 422 is calculated based on the time taken for the safety card 401 to receive the signal for receiving the signal and the speed (= light speed) of the signal (transmitted by the control device 13) previously recorded in the safety card 401. You may make it calculate.

  In step S335, the position calculation units 73 of the safety cards 401-1 to 401-4 calculate (specify) the current positions (positions on the two-dimensional coordinates) of the safety cards 401-1 to 401-4. ) For example, the position calculation unit 73 of the safety card 401-1 refers to the position of the control device 13 and the position of the communication device 14 stored in advance in step S <b> 335, as illustrated in FIG. 19, in step S <b> 333. The distance 421 between the safety card 401-1 calculated by the processing and the communication device 14 is a radius, the circle 431 centered on the communication device 14 and the safety card 401-1 calculated by the processing in step S 334 and the control device. The current position of the safety card 401-1 is calculated based on a circle 432 centered on the control device 13 (projector 1). That is, the intersection of the circle 431 and the circle 432 is calculated (specified) as the current position (position on the two-dimensional coordinate) of the safety card 401-1.

  Note that there are intersections (not shown) between the circle 431 and the circle 432 outside the room 31, but the direction of the signals (signals) transmitted by the control device 13 and the communication device 14 installed near the wall of the room 31. For example, the intersection of the circle 431 and the circle 432 outside the room 31 is excluded by setting only the range (direction) in which the projector 1 projects laser light. Thereby, the position of the safety card 401-1 at the intersection of the circle 431 and the circle 432 is the position of the safety card 401-1 shown in FIG. 19 and the position of the intersection existing outside the room 31. There is no.

  In step S336, the transmission units 45 of the safety cards 401-1 to 401-4 are calculated by the process of step S335 under the control of the transmission control units 74 of the safety cards 401-1 to 401-4. Information indicating the current position of each of the safety cards 401-1 to 401-4 and identification information of each of the safety cards 401-1 to 401-4, that is, the ROM 42 of each of the safety cards 401-1 to 401-4 are stored. The stored ID number is transmitted to the control device 13.

  After the process of step S336, the procedure returns to step S331, and the above-described process is repeated.

  In step S352, the reception unit 93 of the control device 13 transmits the safety cards 401-1 to 401-401 transmitted from the safety cards 401-1 to 401-4 by the processing of step S 336 under the control of the reception control unit 94. -4 and the identification information (ID number) of each of the safety cards 401-1 to 401-4 are received.

  After the process of step S352, the procedure returns to step S351, and is repeated until the control device 13 or the projector 1 is turned off.

  Next, projection permission processing by the control device 13 will be described with reference to the flowchart of FIG. This process is started when the control device 13 or the projector 1 is turned on, and is repeatedly executed while the control device 13 or the projector 1 is turned on.

  In step S381, the determination unit 411 determines whether the identification information of all the safety cards 401 (safety cards 401-1 to 401-4) on the screen 32 has been received within a predetermined time set in advance. .

  Here, it is transmitted from the control device 13 or the communication device 14, or the control device 13 and the communication device 14 to determine whether or not the identification information of the safety cards 401-1 to 401-4 is received within a predetermined time. It is determined whether or not all safety cards 401 are received in all safety cards 401, that is, whether or not all safety cards 401 are arranged in the direction in which the projector 1 (control device 13) projects laser light. It is to do.

  As described above with reference to the flowchart of FIG. 18, each of the safety cards 401-1 to 401-4 is periodically transmitted from the control device 13 and the communication device 14 to each of the safety cards 401-1 to 401-4. Based on the received signal, it calculates the position of itself (each of the safety cards 401-1 to 401-4) and transmits information indicating the position to the control device 13.

  Accordingly, at this time, the fact that the control device 13 cannot receive the information indicating the positions of all the safety cards 401 within a predetermined time means that the control device 13 or the communication device 14, or the control device 13 and the communication device 14. That is, the signal transmitted from is not received by all the safety cards 401. Thereby, it can be determined whether all the safety cards 401 are arranged in the direction in which the projector 1 (control device 13) projects the laser light.

  Note that the number of safety cards 401 may be one.

  When it is determined in step S381 that the identification information of all the safety cards 401 on the screen 32 has been received within a predetermined time set in advance, the process proceeds to step S382, and the determination unit 411 performs the process in step S352 of FIG. It is determined whether or not the current positions of all the safety cards 401 received in the process are within a preset allowable range of the distance between the safety card 401 and the projector 1.

  Here, the allowable range of the distance between the safety card 401 and the projector 1 is, for example, the distance between the projector 1 and the screen 32 on which the projector 1 projects laser light, and the projector 1 displays an image on the screen 32. The distance (area) that can be generated is shown. For example, when the projector 1 is arranged so that the image to be displayed protrudes from the screen 32 by the laser light projected by the projector 1, the position of any of the safety cards 401-1 to 401-4 is This means that the distance between the safety card 401 and the projector 1 is not within the allowable range (the projector 1 does not correctly face the screen 32).

  Note that the allowable range of the distance between the safety card 401 and the projector 1 may be changed according to a zoom function provided in the projector 1.

  In step S382, when it is determined that the current positions of all the safety cards 401 are within the allowable distance between the safety card 401 and the projector 1 set in advance, the projector 1 accurately determines the direction of the screen 32. Therefore, the process proceeds to step S383, and the projection permission unit 412 permits the projector 1 to project light (laser light). The projector 1 projects the laser light when the control device 13 permits the projection of the laser light.

  After the process of step S383, the procedure returns to step S381, and the above-described process is repeated until the control device 13 or the projector 1 is turned off.

  When it is determined in step S381 that the identification information of all the safety cards 401 on the screen 32 has not been received within a predetermined time, the direction in which the projector 1 should project the laser light (the image to be displayed by the projector 1 is The projection permission unit 412 instructs the projector 1 to block light, because the projection permission unit 412 proceeds to step S384. Further, when the projector 1 is instructed to block the projection light from the control device 13, if the projector 1 has already projected the projection light, the projector 1 blocks the projection light by using a mechanical shutter or the like, and still does not project the projection light. When not projecting, the projection light (laser light) is not projected.

  After the process of step S384, the procedure returns to step S381, and the above-described process is repeated until the control device 13 or the projector 1 is turned off.

  If it is determined in step S382 that the current positions of all the safety cards 401 are not within the preset allowable range of the distance between the safety card 401 and the projector 1, the projector 1 faces the screen 32. In step S384, the projection permission unit 412 instructs to block light.

  Each of the safety cards 401-1 to 401-4 may be provided on the screen 32 as shown in FIG. 16 or may be provided on the screen 32 even if not provided on the screen 32. You may make it arrange | position on an extension line. Further, the safety cards 401-1 to 401-4 need not be the screen 32 as long as the projector 1 projects an image, and may be installed on a wall or the like on which an image is displayed.

  Further, the number of safety cards 401 is not limited to the present invention, and may be four or more or one.

  As described above, the projector 1 has high intensity light only in the direction in which the safety cards 401-1 to 401-4 exist, that is, only in a place (area) where the projector 1 needs to project high intensity light. Since the user can turn on the projector 1 at random, it is possible to prevent the strong light from being projected to a place where it is not necessary to project the light. . For example, it is possible to prevent light having a high intensity from being projected in the direction in which the person is present.

  Further, as described above, the control device 13 and the communication device 14 continuously transmit signals while the projector 1 projects an image on the screen 32. Accordingly, for example, when the projector 1 is moved due to an earthquake or the like (the position of the projector 1 is shifted), the laser light projected by the projector 1 is in a direction (screen) where the safety cards 401-1 to 401-4 are not present. Projection in a direction in which 32 does not exist. Thereby, it is possible to prevent erroneously irradiating a strong person to a person in the vicinity of the projector 1 or in the vicinity of the light projected by the projector 1.

  In the embodiment described with reference to FIGS. 15 to 20, each of the safety cards 401-1 to 401-4 is controlled as in the embodiment described with reference to FIGS. By transmitting a predetermined signal to the device 13 and the communication device 14, the control device 13 calculates the distance between each of the safety cards 401-1 to 401-4 and the control device 13, and causes the communication device 14 to calculate the safety card 401. −1 to 401-4 and the communication device 14 may be calculated, and the control device 13 may calculate the positions of the safety cards 401-1 to 401-4.

  In the embodiment described above with reference to FIGS. 1 to 9, 10 to 14, and 15 to 20, the control device 13 and the communication device 14 are configured so that the control device 13 transmits a predetermined signal to the communication device. 14, the control device 13 and the communication device 14 are synchronized so that the reference signal transmitted by the communication device 14 and the predetermined signal transmitted by the control device 13 are simultaneously transmitted to the safety card 11. Also good. At this time, the safety card 11 or the safety card 401 determines the difference between the transmission time of the reference signal included in the reference signal transmitted by the communication device 14 and the reception time when the safety card 11 (safety card 401) receives the reference signal and the safety card. The distance between the safety card 11 (safety card 401) and the communication device 14 may be calculated based on the speed of the reference signal recorded in advance on the card 11 (safety card 401).

  At this time, the distance between the safety card 11 (safety card 401) and the control device 13 is the same as the reception time of the reference signal transmitted by the communication device 14 and the control device 13 transmitted by the safety card 11 (safety card 401). This is calculated based on the difference between the received signal and the speed of the signal transmitted by the control device 13.

  The control device 13 and the communication device 14 described above can be configured by, for example, a personal computer.

  In this case, the control device 13 and the communication device 14 are configured as shown in FIG. 21, for example. The CPU 501 executes various processes according to a program stored in the ROM 502 or a program loaded from the storage unit 508 to the RAM 503. The RAM 503 also appropriately stores data necessary for the CPU 501 to execute various processes.

  The CPU 501, ROM 502, and RAM 503 are connected to each other via a bus 504. An input / output interface 505 is also connected to the bus 504.

  The input / output interface 505 includes an input unit 506 including a keyboard and a mouse, a display including a CRT (Cathode Ray Tube) and an LCD (Liquid Crystal Display), an output unit 507 including a speaker, and a hard disk. Storage unit 508, transmission unit 91 and reception unit 93 of control device 13 shown in FIG. 5, transmission unit 111 of communication device 14 shown in FIG. 6, reception unit 281 and transmission unit 285 of communication device 14 shown in FIG. In addition, a communication unit 509 that is an interface for performing wireless communication with other devices is connected based on a communication method standard such as CDMA or UWB corresponding to the reception unit 301 of the control device 13 shown in FIG.

  The communication unit 509 performs communication processing with other devices via a LAN (Local Area Network) (not shown) or the Internet.

  A drive 510 is also connected to the input / output interface 505, and a removable medium 511 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is appropriately mounted, and a computer program read from them is read as necessary. Installed in the storage unit 508.

  The embodiment of the control device 13 or the communication device 14 to which the present invention is applied is not limited to the personal computer shown in FIG. 21, and the control device 13 or the communication device 14 capable of controlling recording and reading of the recording medium. It doesn't matter if it exists.

  As described above, when the safety card 401, the control device 13, and the communication device 14 communicate with each other, data can be transmitted and received. A first wireless signal for causing the information processing device to calculate a first distance between the information processing device and the communication device transmitted from the communication device; and an information processing device and the display device transmitted from the display device. A second wireless signal for calculating the second distance is received, a first distance is calculated based on the first wireless signal, and a second distance is calculated based on the second wireless signal. Based on the first distance and the second distance, a position on the plane of the information processing device is calculated, a third wireless signal indicating the position on the plane of the information processing device is transmitted to the display device, and a communication device Transmits a first wireless signal for calculating a first distance between the information processing device and the communication device to the information processing device, and the display device determines a second distance between the information processing device and the display device. A second wireless signal for calculation is transmitted to the information processing device, and the information processing device When the third wireless signal indicating the position on the plane of the information processing apparatus is received and the position on the plane of the information processing apparatus is within the permitted area in the direction in which the light is projected, the image In the case where the projection of the light for displaying the light onto the display area is permitted, it is possible to prevent the light from being irradiated to a place other than the place where the projection of the light having a high intensity is required.

  The series of processes described above can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, various functions can be executed by installing a computer that is built in dedicated hardware or various programs. For example, it is installed from a recording medium in a general-purpose personal computer or the like.

  This recording medium is distributed in order to provide a program to the user separately from the computer, such as the removable medium 52 shown in FIG. 3 and the removable medium 511 shown in FIG. Disk (including flexible disk), optical disk (including CD-ROM (compact disk read-only memory), DVD (digital versatile disc)), magneto-optical disk (including MD (mini disc) (trademark)), or semiconductor It is not only configured by a package medium including a memory or the like, but is also configured by a ROM or a hard disk on which a program is provided, which is provided to the user in a state of being preinstalled in a computer.

  The program for executing the series of processes described above is installed in a computer via a wired or wireless communication medium such as a local area network, the Internet, or digital satellite broadcasting via an interface such as a router or a modem as necessary. You may be made to do.

  In addition, in this specification, the step of describing the program stored in the recording medium is not limited to the processing performed in time series according to the described order, but is not necessarily performed in time series. Or the process performed separately is included.

  Furthermore, in this specification, the system refers to the entire apparatus constituted by a plurality of apparatuses.

It is a figure which shows the example of 1 embodiment of the display control system which concerns on this invention. It is a figure which shows the example of arrangement | positioning of a control apparatus and a communication apparatus in the room using the display control system which concerns on this invention. It is a block diagram which shows the example of a structure of a safety card. It is a block diagram which shows the example of a function structure of the position specific program which the control part of FIG. 3 performs. It is a block diagram which shows the example of a function structure of a control apparatus. It is a block diagram which shows the example of a function structure of a communication apparatus. It is a flowchart explaining the process of a display control system. It is a figure explaining the identification method of the present position of a safety card. It is a figure explaining a danger area. It is a figure which shows the other example of embodiment of the display control system which concerns on this invention. It is a block diagram which shows the example of a function structure of the signal transmission program which the control part of FIG. 3 performs. It is a block diagram which shows the other example of a structure of the function of a communication apparatus. It is a block diagram which shows the other example of a structure of the function of a control apparatus. It is a flowchart explaining the process of a display control system. It is a figure which shows the example of arrangement | positioning of a safety card, a control apparatus, and a communication apparatus in the room using the further another example of embodiment of the display control system which concerns on this invention. It is a figure which shows the example of the screen which has arrange | positioned the safety card. It is a figure which shows the other example of a structure of the function of a control apparatus. It is a flowchart explaining the process of the transmission of the signal by a communication apparatus, the process of reception of the information which shows the position and identification information by a control apparatus, and the process of position specification by a safety card. It is a figure explaining the identification method of the position of a safety card. It is a flowchart explaining the process of permission of projection. It is a block diagram which shows the example of a structure of a control apparatus and a communication apparatus.

Explanation of symbols

  1 projector, 11 safety card, 13 control device, 14 communication device, 32 screen, 41 control unit, 42 ROM, 44 reception unit, 45 transmission unit, 46 clock generator, 47 GPS reception unit, 52 removable media, 61 position specifying program , 72 distance calculation unit, 73 position calculation unit, 91 transmission unit, 93 reception unit, 95 identification information determination unit, 96 area determination unit, 97 reduction instruction unit, 111 transmission unit, 151 distance, 152 distance, 171 dangerous area, 172 Hazardous area, 251 signal transmission program, 281 reception unit, 283 distance calculation unit, 285 transmission unit, 301 reception unit, 303 distance calculation unit, 304 position calculation unit, 401 and 401-1 to 401-4 safety card, 411 determination unit 412 projecting authorization unit, 421 a distance, 422 distance, 501 CPU, 502 ROM, 511 removable medium

Claims (12)

A display device that projects light in a predetermined direction to display an image, at least one information processing device arranged in a display area that displays the image, and at least one or more that performs wireless communication with the information processing device In a display control system comprising communication devices of
The information processing apparatus includes:
A first wireless signal for calculating a first distance between the information processing device and the communication device transmitted from the communication device; and the information processing device and the display device transmitted from the display device First receiving means for receiving a second radio signal for calculating a second distance between
Distance calculating means for calculating the first distance based on the first wireless signal and calculating the second distance based on the second wireless signal;
Position calculating means for calculating a position on a plane of the information processing device based on the first distance and the second distance;
First transmission means for transmitting a third wireless signal indicating the position on the plane of the information processing device to the display device;
The communication device includes second transmission means for transmitting the first wireless signal for calculating the first distance between the information processing device and the communication device to the information processing device,
The display device
Third transmission means for transmitting the second wireless signal for calculating the second distance between the information processing device and the display device to the information processing device;
Second receiving means for receiving the third radio signal transmitted from the information processing apparatus and indicating the position on the plane of the information processing apparatus;
A projection permission means for permitting projection of the light for displaying the image onto the display area when the position on the plane of the information processing device is within the permission area in a direction in which light is projected. Characteristic display control system. A display device that projects light in a predetermined direction to display an image, at least one information processing device arranged in a display area that displays the image, and at least one or more that performs wireless communication with the information processing device In the display control method of the display control system comprising the communication devices of
The communication device transmits a first wireless signal for calculating a first distance between the information processing device and the communication device to the information processing device,
The display device transmits a second wireless signal for calculating a second distance between the information processing device and the display device to the information processing device,
The information processing apparatus includes:
Receiving the first wireless signal for calculating the first distance between the information processing device and the communication device transmitted from the communication device;
Receiving the second wireless signal for calculating the second distance between the information processing device and the display device transmitted from the display device;
Calculating the first distance based on the first radio signal;
Calculating the second distance based on the second radio signal;
Based on the first distance and the second distance, a position on the plane of the information processing apparatus is calculated,
Transmitting a third wireless signal indicating the position on the plane of the information processing device to the display device;
The display device
Receiving the third wireless signal transmitted from the information processing device and indicating the position on the plane of the information processing device;
When the position on the plane of the information processing device is within a permission region in a direction in which light is projected, projection of light for displaying the image onto the display region is permitted. . An information processing apparatus arranged in a display area for displaying an image, wherein the information processing apparatus wirelessly communicates with a display apparatus that projects light in a predetermined direction to display an image, and transmits a predetermined signal. In an information processing apparatus that performs wireless communication with a communication apparatus,
A first wireless signal for calculating a first distance between the communication device and the communication device, and a second distance between the display device and the display device. Receiving means for receiving a second radio signal for calculating
Distance calculating means for calculating the first distance based on the first wireless signal and calculating the second distance based on the second wireless signal;
Position calculating means for calculating a position on its own plane based on the first distance and the second distance;
An information processing apparatus comprising: a transmission unit configured to transmit a third wireless signal indicating the position on its own plane to the display device. The information processing apparatus according to claim 3, wherein the transmission unit transmits the third wireless signal including identification information for identifying itself to the display device. An information processing apparatus arranged in a display area for displaying an image, wherein the information processing apparatus wirelessly communicates with a display apparatus that projects light in a predetermined direction to display an image, and transmits a predetermined signal. In an information processing method of an information processing apparatus that performs wireless communication with a communication apparatus,
A first wireless signal for calculating a first distance between the information processing device and the communication device transmitted from the communication device; and the information processing device and the display device transmitted from the display device Receiving a second radio signal for calculating a second distance between the first radio signal and the second radio signal;
A distance calculating step of calculating the first distance based on the first wireless signal and calculating the second distance based on the second wireless signal;
A position calculating step for calculating a position on a plane of the information processing device based on the first distance and the second distance;
And a transmission step of transmitting a third radio signal indicating the position on the plane of the information processing apparatus to the display apparatus. An information processing apparatus arranged in a display area for displaying an image, wherein the information processing apparatus wirelessly communicates with a display apparatus that projects light in a predetermined direction to display an image, and transmits a predetermined signal. In an information processing program for an information processing apparatus that performs wireless communication with a communication apparatus,
A first wireless signal for calculating a first distance between the information processing device and the communication device transmitted from the communication device; and the information processing device and the display device transmitted from the display device A reception control step for controlling reception of a second radio signal for calculating the second distance between
A distance calculating step of calculating the first distance based on the first wireless signal and calculating the second distance based on the second wireless signal;
A position calculating step for calculating a position on a plane of the information processing device based on the first distance and the second distance;
And a transmission control step for controlling transmission of a third wireless signal indicating the position on the plane of the information processing device to the display device. Medium. An information processing apparatus arranged in a display area for displaying an image, wherein the information processing apparatus wirelessly communicates with a display apparatus that projects light in a predetermined direction to display an image, and transmits a predetermined signal. In a program for causing a computer that controls an information processing apparatus that performs wireless communication with a communication apparatus to perform information processing,
A first wireless signal for calculating a first distance between the information processing device and the communication device transmitted from the communication device; and the information processing device and the display device transmitted from the display device A reception control step for controlling reception of a second radio signal for calculating the second distance between
A distance calculating step of calculating the first distance based on the first wireless signal and calculating the second distance based on the second wireless signal;
A position calculating step for calculating a position on a plane of the information processing device based on the first distance and the second distance;
And a transmission control step for controlling transmission of a third wireless signal indicating the position on the plane of the information processing apparatus to the display device. In a display device that displays an image by projecting light in a predetermined direction,
At least one information processing device arranged in a display area for displaying the image, and a first distance for calculating a first distance between the information processing device and the communication device transmitted from the communication device. Transmitting means for transmitting a second wireless signal for calculating a second distance between the information processing apparatus and the information processing apparatus to the information processing apparatus receiving one wireless signal;
A third position indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the first distance and the second distance. Receiving means for receiving a radio signal of;
Projection permitting means for permitting projection of the light for displaying the image onto the display area when the position on the plane of the information processing apparatus is within the permission area in the direction in which the light is projected. Characteristic display device. The display device according to claim 8, wherein the image is displayed by projecting light that is a laser in the direction. In a display method of a display device that displays light by projecting light in a predetermined direction,
At least one information processing device arranged in a display area for displaying the image, and a first distance for calculating a first distance between the information processing device and the communication device transmitted from the communication device. A transmission step of transmitting a second wireless signal for calculating a second distance between the information processing device and the display device to the information processing device receiving one wireless signal;
A third position indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the first distance and the second distance. A receiving step of receiving a radio signal of
A projection permission step for permitting projection of the light for displaying the image onto the display area when the position on the plane of the information processing apparatus is within the permission area in the direction in which the light is projected. Characteristic display method. In a program for display processing of a display device that displays light by projecting light in a predetermined direction,
At least one information processing device arranged in a display area for displaying the image, and a first distance for calculating a first distance between the information processing device and the communication device transmitted from the communication device. A transmission control step for controlling transmission of a second wireless signal for calculating a second distance between the information processing device and the display device to the information processing device receiving one wireless signal;
A third position indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the first distance and the second distance. A reception control step for controlling the reception of the wireless signal;
A projection permission step for permitting projection of the light for displaying the image onto the display area when the position on the plane of the information processing apparatus is within the permission area in the direction in which the light is projected. A recording medium on which a computer-readable program is recorded. In a program for causing a computer that controls a display device that displays an image by projecting light in a predetermined direction to perform display processing,
At least one information processing device arranged in a display area for displaying the image, and a first distance for calculating a first distance between the information processing device and the communication device transmitted from the communication device. A transmission control step for controlling transmission of a second wireless signal for calculating a second distance between the information processing device and the display device to the information processing device receiving one wireless signal;
A third position indicating the position on the plane of the information processing apparatus transmitted from the information processing apparatus that has calculated the position on the plane of the information processing apparatus based on the first distance and the second distance. A reception control step for controlling the reception of the wireless signal;
A projection permission step for permitting projection of the light for displaying the image onto the display area when the position on the plane of the information processing apparatus is within the permission area in the direction in which the light is projected. A featured program.

Images