JP2015102571A - Projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector that avoids, when the temperature inside the projector increases, failure occurring due to excessive heating while maintaining display quality of a three-dimensional video.SOLUTION: A projector 500 includes: a discharge lamp 90 that emits light at the brightness according to an applied voltage as a light source for projecting a video; a temperature detection unit 590 that detects a change in temperature; a timing control unit 584 that controls to switch a video for a right eye and a video for a left eye according to the video alternately at a predetermined switching timing, so that a period held between the temporarily adjacent switching timings starts as a first period and ends as a second period; and a light source drive control unit 582 that controls an applied voltage in the second period to become higher than an applied voltage in the first period, and increases or decreases at least the applied voltage in the second period according to a change in temperature detected by the temperature detection unit 590.

Description

  The present invention relates to a projection apparatus.

In recent years, as a method of displaying a 3D image such as a stereoscopic image with a projector, an active method such as a method of alternately switching between a right-eye image and a left-eye image (for example, an “XPAND beyond cinema (registered trademark)” method) The shutter glasses method) is known.
In this method, active shutter glasses or the like synchronized with the video signal are attached, and the video for the right eye is displayed on the right eye, and the video for the left eye is displayed on the left eye, so that the video is viewed stereoscopically using the parallax of the left and right eyes.
When three-dimensional images are projected by alternately outputting right-eye and left-eye images, the amount of light entering the right and left eyes is less than half compared to the case of projecting conventional planar images (two-dimensional images). It becomes. In addition, when a crosstalk occurs in which the right-eye video enters the left eye or the left-eye video enters the right eye, the video is not perceived as a three-dimensional image, so a period in which both active shutters are closed is required.

Accordingly, when a stereoscopic image is projected by a method of alternately outputting a right-eye image and a left-eye image, the image looks darker than when a conventional planar image is projected. The brightness of the video immediately before the switching between the right-eye video and the left-eye video is made higher than the brightness of the video immediately after the switching, thereby avoiding that the stereoscopic video looks dark.
By the way, in such a projector, a high-intensity lamp is used to project an image brighter. Therefore, a cooling device such as a fan and a ventilation path that can cope with an assumed temperature rise is configured inside the projector, and the cooling device is driven to enable continuous projection with high brightness. In addition, when other items, etc., block the projector's exhaust port and prevent exhaust, the temperature sensor installed inside the projector detects an abnormal rise in temperature to prevent failure due to overheating. The lamp has a function of reducing the luminance of the lamp to a predetermined luminance value.

JP 2012-32504 A

However, when displaying 3D video, reducing the lamp brightness to a predetermined brightness value, the amount of light entering each of the right eye and left eye is drastically reduced, significantly reducing the display quality of the 3D video. .
The present invention has been made in view of the above-described problems, and an object thereof is to provide a projector that avoids a failure caused by overheating while maintaining the display quality of a three-dimensional image when the temperature inside the projector rises. To do.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
The projection apparatus according to this application example includes a light emitting unit that emits light with a luminance corresponding to an applied voltage as a light source for projecting an image, a detecting unit that detects a temperature change of the light emitting unit, and the image is a 3D image. In this case, the right-eye video and the left-eye video are alternately switched at a predetermined switching timing according to the video, and a period between the temporally adjacent switching timings starts in the first period and ends in the second period. Switching control means for controlling, and controlling the applied voltage in the second period to be higher than the applied voltage in the first period, and at least the applied voltage in the second period according to the temperature change And an applied voltage control means for increasing and decreasing.

  According to such a configuration, when the video is a 3D video, the switching control means switches between the right-eye video and the left-eye video alternately at a predetermined switching timing according to the video, and the period of the right-eye video. And the left-eye video period are controlled to start and end in the first period and the second period, respectively, and the applied voltage control unit emits light in addition to increasing the luminance of the light-emitting unit in the second period than in the first period. The luminance of the light emitting means is increased or decreased at least in the second period according to the temperature change of the means. Therefore, it is possible to avoid a failure caused by overheating while maintaining the brightness of the image felt when viewing the 3D image.

[Application Example 2]
In the projection apparatus according to the application example, when the detection unit detects the temperature change, the applied voltage control unit has a first correlation indicating a relationship between the temperature change and the applied voltage in the second period. It is preferable to determine the applied voltage in the second period based on.

  According to such a configuration, when the temperature of the light emitting unit changes, the applied voltage to the light emitting unit is determined based on the first correlation indicating the applied voltage in the second period according to the temperature change. The applied voltage can be effectively controlled by appropriately setting the correlation.

[Application Example 3]
In the projection apparatus according to the application example, when the image is not a 3D image, the applied voltage control unit controls the applied voltage in the first period and the second period to be the same, and detects the detection. When the means detects a temperature rise, it is preferable to determine the applied voltage based on a second correlation indicating a relationship between the temperature change and the same applied voltage.

  According to such a configuration, when the video is not a 3D video, the applied voltages in the first period and the second period are the same, and the applied voltage when the detection unit detects a temperature rise includes the temperature change and the applied voltage. It is determined based on the second correlation indicating the relationship.

[Application Example 4]
In the projection apparatus according to the application example, the rate of change of the same applied voltage with respect to the temperature change in the second correlation is the rate of change of the applied voltage in the second period with respect to the temperature change in the first correlation. It is preferable that the rate of change is greater.

  According to such a configuration, the rate of change of the applied voltage according to the temperature change is greater when the second correlation is applied than when the first correlation is applied.

[Application Example 5]
In the projection apparatus according to the application example, the detection unit can detect the temperature of the light emitting unit, and detects the temperature detected when the video is a 3D video and the temperature detected when the video is not a 3D video. When the temperatures are the same, the applied voltage in the second period is preferably higher than the same applied voltage.

  According to such a configuration, when the video is a 3D video, it is possible to suppress a reduction in luminance according to a rise in the temperature of the light emitting unit, compared to a case where the video is not a 3D video.

[Application Example 6]
In the projection device according to the application example, the first correlation and the second correlation may be stored in a table format.

1 is a diagram showing an optical system of a projector according to an embodiment of the invention. The figure which shows the structure of a light source device. FIG. 2 is a diagram illustrating a functional configuration of a projector according to an embodiment of the invention. The figure explaining 1st period, 2nd period, and switching timing. The figure which shows the change of the brightness | luminance of the discharge lamp controlled according to a temperature change and a temperature change.

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

(Embodiment)
1-1. Optical System of Projector FIG. 1 is an explanatory diagram showing an optical system of a projector 500 according to this embodiment. The projector 500, which is a projection device, employs a liquid crystal projector method, and includes a light source device 200, a collimating lens 305, an illumination optical system 310, a color separation optical system 320, three liquid crystal light valves 330R, 330G, and 330B. A cross dichroic prism 340 and a projection optical system 350 are included.
The light source device 200 includes a light source unit 210 and a discharge lamp lighting device 10. The light source unit 210 includes a main reflecting mirror 112, a sub reflecting mirror 50 (FIG. 2), and a discharge lamp 90. The discharge lamp lighting device 10 supplies power to the discharge lamp 90 that functions as a light source for projecting an image to light the discharge lamp 90.
The discharge lamp 90 functions as a light emitting unit that emits light with a luminance corresponding to an applied voltage as a light source for projecting an image. In the present embodiment, the discharge lamp 90 is assumed to be a high-pressure mercury lamp or a metal halide lamp, but is not limited thereto.
The main reflecting mirror 112 reflects the light emitted from the discharge lamp 90 in the irradiation direction D. The irradiation direction D is parallel to the optical axis AX. Light from the light source unit 210 passes through the collimating lens 305 and enters the illumination optical system 310. The collimating lens 305 collimates the light from the light source unit 210.

The illumination optical system 310 makes the illuminance of light from the light source device 200 uniform in the liquid crystal light valves 330R, 330G, and 330B. The illumination optical system 310 aligns the polarization direction of light from the light source device 200 in one direction. This is because the light from the light source device 200 is effectively used by the liquid crystal light valves 330R, 330G, and 330B. The light whose illuminance distribution and polarization direction are adjusted enters the color separation optical system 320. The color separation optical system 320 separates incident light into three color lights of red (R), green (G), and blue (B). The three color lights are respectively modulated by the liquid crystal light valves 330R, 330G, and 330B associated with the respective colors.
The liquid crystal light valves 330R, 330G, and 330B include liquid crystal panels 560R, 560G, and 560B, and polarizing plates (not shown) disposed on the light incident side and the emission side of the liquid crystal panels 560R, 560G, and 560B, respectively. The modulated three color lights are combined by the cross dichroic prism 340. The combined light enters the projection optical system 350.
The projection optical system 350 projects incident light onto the screen 700 (FIG. 3). As a result, an image is displayed on the screen 700.

Note that various known configurations can be adopted as the configurations of the collimating lens 305, the illumination optical system 310, the color separation optical system 320, the cross dichroic prism 340, and the projection optical system 350.
FIG. 2 is an explanatory diagram showing the configuration of the light source device 200. The light source device 200 includes a light source unit 210 and a discharge lamp lighting device 10. In the drawing, a cross-sectional view of the light source unit 210 is shown. The light source unit 210 includes a main reflecting mirror 112, a discharge lamp 90, and a sub reflecting mirror 50.
The shape of the discharge lamp 90 is a rod shape extending along the irradiation direction D from the first end 90e1 to the second end 90e2. The material of the discharge lamp 90 is a translucent material such as quartz glass, for example. A central portion of the discharge lamp 90 swells in a spherical shape, and a discharge space 91 is formed therein. The discharge space 91 is filled with a gas that is a discharge medium containing a rare gas, a metal halide compound, or the like.

  In addition, the first electrode 92 and the second electrode 93 protrude from the discharge lamp 90 in the discharge space 91. The first electrode 92 is disposed on the first end 90 e 1 side of the discharge space 91, and the second electrode 93 is disposed on the second end 90 e 2 side of the discharge space 91. The shape of the first electrode 92 and the second electrode 93 is a rod shape extending along the optical axis AX. In the discharge space 91, the electrode tip portions (also referred to as “discharge ends”) of the first electrode 92 and the second electrode 93 face each other with a predetermined distance therebetween. The material of the first electrode 92 and the second electrode 93 is, for example, a metal such as tungsten.

  A first terminal 536 is provided at the first end 90 e 1 of the discharge lamp 90. The first terminal 536 and the first electrode 92 are electrically connected by a conductive member 534 that passes through the inside of the discharge lamp 90. Similarly, a second terminal 546 is provided at the second end 90 e 2 of the discharge lamp 90. The second terminal 546 and the second electrode 93 are electrically connected by a conductive member 544 that passes through the inside of the discharge lamp 90. The material of the first terminal 536 and the second terminal 546 is, for example, a metal such as tungsten. Further, as each of the conductive members 534 and 544, for example, a molybdenum foil is used.

The first terminal 536 and the second terminal 546 are connected to the discharge lamp lighting device 10. The discharge lamp lighting device 10 supplies a drive current for driving the discharge lamp 90 to the first terminal 536 and the second terminal 546. As a result, arc discharge occurs between the first electrode 92 and the second electrode 93. Light (discharge light) generated by the arc discharge is radiated in all directions from the discharge position, as indicated by the dashed arrows.
The main reflecting mirror 112 is fixed to the first end 90 e 1 of the discharge lamp 90 by a fixing member 114. The shape of the reflecting surface (the surface on the discharge lamp 90 side) of the main reflecting mirror 112 is a spheroid shape. The main reflecting mirror 112 reflects the discharge light in the irradiation direction D. The shape of the reflecting surface of the main reflecting mirror 112 is not limited to a spheroidal shape, and various shapes that reflect the discharge light toward the irradiation direction D can be employed. For example, a rotating parabolic shape may be adopted. In this case, the main reflecting mirror 112 can convert the discharge light into light substantially parallel to the optical axis AX. Therefore, the collimating lens 305 can be omitted.

The sub-reflecting mirror 50 is fixed to the second end 90 e 2 side of the discharge lamp 90 by a fixing member 522. The shape of the reflective surface (surface on the discharge lamp 90 side) of the sub-reflecting mirror 50 is a spherical shape that surrounds the second end 90e2 side of the discharge space 91. The sub-reflecting mirror 50 reflects the discharge light toward the main reflecting mirror 112. Thereby, the utilization efficiency of the light radiated | emitted from the discharge space 91 can be improved.
In addition, as a material of the fixing members 114 and 522, any heat resistant material that can withstand the heat generated by the discharge lamp 90 (for example, an inorganic adhesive having heat resistance) can be used. Further, the method of fixing the arrangement of the main reflecting mirror 112 and the sub-reflecting mirror 50 and the discharge lamp 90 is not limited to the method of fixing the main reflecting mirror 112 and the sub-reflecting mirror 50 to the discharge lamp 90, and any method can be used. It can be adopted. For example, the discharge lamp 90 and the main reflecting mirror 112 may be independently fixed to a housing (not shown) of the projector. The same applies to the sub-reflecting mirror 50.

1-2. Functional Configuration of Projector FIG. 3 is a diagram illustrating a functional configuration of the projector 500 according to the present embodiment. In addition to the optical system described above, the projector 500 includes an image signal conversion unit 510, a DC power supply device 80, a discharge lamp lighting device 10, a discharge lamp 90, liquid crystal panels 560R, 560G, and 560B, an image processing device 570, and a temperature detection unit. 590, a cooling device 595, and a control unit 580. The control unit 580 includes a light source drive control unit 582 and a timing control unit 584.
The image signal conversion unit 510 converts an image signal 502 (such as a luminance-color difference signal or an analog RGB signal) input from the outside into a digital RGB signal having a predetermined word length to generate image signals 512R, 512G, and 512B. This is supplied to the image processing device 570. The image signal conversion unit 510 also receives the right-eye video and the left-eye video as the image signal 502 when a stereoscopic video signal that alternately switches the right-eye video and the left-eye video at a given switching timing is input. A synchronization signal for generating a control signal is output to the control unit 580 based on the switching timing.

The DC power supply device 80 converts an AC voltage supplied from an external AC power supply 600 into a constant DC voltage, and an image signal conversion unit on the secondary side of a transformer (not shown, but included in the DC power supply device 80). 510, the converted DC voltage is supplied to the image processing device 570 and the discharge lamp lighting device 10 on the primary side of the transformer.
The discharge lamp lighting device 10 generates a high voltage between the electrodes of the discharge lamp 90 at the time of startup to cause a dielectric breakdown to form a discharge path, and thereafter supplies a driving current for the discharge lamp 90 to maintain a discharge. The discharge lamp lighting device 10 controls the luminance of the discharge lamp 90 by varying the applied voltage V applied to the discharge lamp 90 based on the instruction signal output from the light source drive control unit 582.
The liquid crystal panels 560R, 560G, and 560B modulate the luminance of the color light incident on each liquid crystal panel via the optical system described above based on the drive signals 572R, 572G, and 572B, respectively.

The image processing device 570 performs image processing on each of the three image signals 512R, 512G, and 512B, and supplies driving signals 572R, 572G, and 572B for driving the liquid crystal panels 560R, 560G, and 560B, respectively, to the liquid crystal panels 560R, 560G. , 560B.
The temperature detection unit 590 functions as a detection unit that detects a temperature change inside the projector 500 and outputs temperature information related to the temperature change. The temperature detector 590 is installed inside the projector 500 and includes a temperature sensor (not shown) that outputs an electrical signal corresponding to a temperature change. In the present embodiment, the temperature sensor is installed in the vicinity of the discharge lamp 90 of the light source device 200 or in the vicinity of the liquid crystal panels 560R, 560G, and 560B, and the light energy emitted from the discharge lamp 90 is converted into thermal energy. The temperature change that occurs is detected. The temperature detection unit 590 converts the electrical signal output from the temperature sensor into temperature information, and outputs the converted temperature information. When a plurality of temperature sensors are installed, the temperature information of the temperature sensor with the highest detected temperature is set to be output.

The light source drive control unit 582 controls the operation of the light source device 200. In the present embodiment, the light source drive control unit 582 receives the lighting information of the discharge lamp 90 from the discharge lamp lighting device 10, the synchronization signal output from the image signal conversion unit 510, and the temperature information from the temperature detection unit 590, and lights up. Based on the information and temperature information, an instruction signal is output to the discharge lamp lighting device 10 in order to increase or decrease the applied voltage applied to the discharge lamp 90. The light source drive control unit 582 corresponds to an applied voltage control unit.
The timing control unit 584 sends a control signal for controlling the active shutter glasses 410 in synchronization with the synchronization signal of the image signal 502 output from the image signal conversion unit 510 via a wired or wireless communication unit. Output to 410. The timing control unit 584 corresponds to a switching control unit.
The projector system 400 includes a projector 500 and active shutter glasses 410, and is active by controlling the active shutter glasses 410 according to an image signal 502 of a video (3D video) corresponding to 3D display. A viewer wearing the shutter glasses 410 can visually recognize a three-dimensional image.

The active shutter glasses 410 may include a right shutter 412 and a left shutter 414. The right shutter 412 and the left shutter 414 are controlled to open and close based on a control signal. When the user wears the active shutter glasses 410, the right shutter 412 is closed, so that the visual field on the right eye side can be blocked.
Further, when the user wears the active shutter glasses 410, the left shutter 414 is closed so that the visual field on the left eye side can be blocked. The right shutter 412 and the left shutter 414 may be configured with, for example, a liquid crystal shutter.

1-3. Next, a specific example of control of the drive current I in the projector 500 according to the first embodiment will be described.

  FIG. 4 is a diagram for explaining the first period, the second period, and the switching timing. FIG. 4 shows the contents of the drive signals 572R, 572G, and 572B, the open / close state of the right shutter 412, the open / close state of the left shutter 414, the first period and the second period, and the switching timing in order from the top. Yes. The horizontal axis in FIG. 4 is time.

  In the example shown in FIG. 4, the drive signals 572R, 572G, and 572B are the right-eye video from time t1 to time t3, the left-eye video from time t3 to time t5, and from time t5 to time t7. Between the time t7 and the time t9 is a drive signal corresponding to the left-eye video. Therefore, in the example shown in FIG. 4, the projector 500 switches the right-eye video and the left-eye video alternately with the time t1, the time t3, the time t5, the time t7, and the time t9 as switching timings.

A period between temporally adjacent switching timings starts with the first period and ends with the second period. In the example shown in FIG. 4, for example, the period between the time t1 and the time t3 that is the switching timing starts with the first period from the time t1 to the time t2, and is between the time t2 and the time t3. Ends in the second period. The same applies to a period sandwiched between time t3 and time t5 serving as switching timing, a period sandwiched between time t5 and time t7 serving as switching timing, and a period sandwiched between time t7 and time t9 serving as switching timing.
In the example shown in FIG. 4, the length of the first period and the length of the second period are the same, but the length of the first period and the length of the second period are appropriately set as necessary. Can be set.

  The right shutter 412 is in an open state during at least a part of the period in which the drive signals 572R, 572G, and 572B corresponding to the right-eye video are input to the liquid crystal panels 560R, 560G, and 560B. In the example shown in FIG. 4, the right shutter 412 is in a closed state from time t1 to time t2, and is in an open state from time t2 to time t3. In the example shown in FIG. 4, the right shutter 412 starts to close from time t3 during the period in which the drive signals 572R, 572G, and 572B corresponding to the left-eye video are input to the liquid crystal panels 560R, 560G, and 560B. It is closed between time t3 and time t4, and is closed between time t4 and time t5. The change in the open / close state of the right shutter 412 from time t5 to time t9 is the same as the change in the open / close state from time t1 to time t5.

The left shutter 414 is in an open state during at least a part of the period in which the drive signals 572R, 572G, and 572B corresponding to the left-eye video are input to the liquid crystal panels 560R, 560G, and 560B. In the example shown in FIG. 4, the left shutter 414 is in a closed state from time t3 to time t4, and is in an open state from time t4 to time t5.
In the example shown in FIG. 4, the left shutter 414 starts to close from time t <b> 1 during a period in which the drive signals 572 </ b> R, 572 </ b> G, 572 </ b> B corresponding to the right-eye video are input to the liquid crystal panels 560 </ b> R, 560 </ b> G, 560 </ b> B. It is closed between time t1 and time t2, and is closed between time t2 and time t3. The change in the open / close state of the left shutter 414 between the time t5 and the time t9 is the same as the change in the open / close state between the time t1 and the time t5.

In the example shown in FIG. 4, in the period in which the drive signals 572R, 572G, and 572B corresponding to the right-eye video are input to the liquid crystal panels 560R, 560G, and 560B, the period in which the right shutter 412 is closed is the first period. The period during which the right shutter 412 is open corresponds to the second period.
Further, in the example shown in FIG. 4, during the period in which the drive signals 572R, 572G, and 572B corresponding to the left-eye video are input to the liquid crystal panels 560R, 560G, and 560B, the period in which the left shutter 414 is closed is the first. The period during which the left shutter 414 is open for one period corresponds to the second period. In the example shown in FIG. 4, in the first period, there is a period in which both the right shutter 412 and the left shutter 414 are closed.

FIG. 5 shows the temperature change detected by the temperature detection unit 590 and the brightness of the discharge lamp 90 controlled according to the temperature change (lamp brightness) when the projector 500 displays an image signal 502 corresponding to three-dimensional display. ).
As shown in FIG. 5, when a predetermined applied voltage V is applied to the discharge lamp 90 at time t1, the discharge light starts to be emitted from the discharge lamp 90, and the left-eye video and right-eye video are displayed in accordance with the image signal 502. Images are alternately switched and projected.
The light source drive control unit 582 analyzes the synchronization signal output from the image signal conversion unit 510, and the applied voltage V applied to the discharge lamp 90 is relatively minimum in the first period, and is relative in the second period. Therefore, the discharge lamp lighting device 10 is controlled so as to be maximized. Hereinafter, such control is referred to as boost control. In this embodiment, when the luminance with respect to the rated voltage is 100%, the lamp luminance in the first period is about 30% at the start of discharge. Further, in the present embodiment, the projector 500 is assumed to be in a low temperature state at the start of lighting of the discharge lamp 90 and the lamp brightness in the second period is assumed to be about 120%, but is not limited thereto.

  By the boost control, an image is projected darkly in the first period, and an image is projected brightly in the second period. That is, in the first period, there is a period in which both the right shutter 412 and the left shutter 414 are closed. Therefore, even if the projected image is dark, the image quality is hardly affected. On the other hand, in the second period, one of the right shutter 412 and the left shutter 414 is in an open state, and the projected image can be shown bright to the user. Further, the occurrence of crosstalk is suppressed by projecting the image darkly in the first period.

On the other hand, when the discharge lamp 90 is turned on and projection is started, a cooling device 595 including a fan, a ventilation path, and the like (not shown) is activated to start cooling the region where the temperature of the discharge lamp 90 and the like rises. However, for example, when the air inlet and the air outlet are blocked, the temperature inside the projector 500 gradually increases. The temperature detection unit 590 detects the temperature, and when the detected temperature exceeds a predetermined reference temperature S, the light source drive control unit 582 applies an applied voltage to the discharge lamp 90 in the second period so as to suppress the temperature rise. V reduction processing is started. In FIG. 5, the reduction process is started from time t5.
When the light source drive control unit 582 starts the reduction process, the light source drive control unit 582 determines the reduced applied voltage V according to the temperature rise detected by the temperature detecting unit 590 and notifies the discharge lamp lighting device 10 of the determined applied voltage V. In the present embodiment, the light source drive control unit 582 holds in advance correlation data in which the temperature and the applied voltage V in the second period are associated with each other. Note that the first correlation is applied when boost control is performed, and the second correlation is applied when boost control is not performed. In the present embodiment, the two correlations are stored in the projector 500 in the form of a discrete table.
When the temperature rise in the projector 500 is the same, the decrease rate (change rate) of the applied voltage V indicated by the first correlation applied when boost control is performed is applied when boost control is not performed. It is set to be smaller than the decreasing rate of the applied voltage V indicated by the second correlation. This is because when the boost control is performed, the lamp brightness decreases at the timing when both the right shutter 412 and the left shutter 414 are closed at the time of shutter switching. Therefore, the contribution when the boost control does not perform the boost control. This is because it is smaller than the degree.

Therefore, during boost control, as shown in graph P of FIG. 5, the applied voltage V gradually decreases as the temperature increases as time elapses. For example, at time t17, the lamp brightness in the second period is 90%. The brightness difference between the first period and the second period is reduced. Note that since the luminance difference is gradually reduced, the user can continue viewing without feeling a decrease in brightness of the three-dimensional image.
On the other hand, when boost control is not performed and the discharge lamp 90 is continuously lit at the same brightness with the same applied voltage in the first period and the second period, as shown in the graph Q of FIG. The applied voltage V decreases at a larger decrease rate than the graph P as the temperature rises with time.

In addition, FIG. 5 demonstrated the case where the temperature which the temperature detection part 590 detects rises, However, When the air blower port which was blocked | restored is restored | restored to the normal state and the cooling device 595 functions normally, it will be temperature fall. Along with this, the applied voltage increases and the lamp brightness gradually increases. Eventually, when the temperature transitions below the predetermined reference temperature S, the lamp brightness in the second period returns to about 120%.
In this embodiment, when boost control is performed, the applied voltage V in the second period is reduced as the temperature rises. However, an aspect in which the applied voltage V in the first period is further reduced can be assumed.

According to the embodiment described above, the following effects can be obtained.
(1) In the projector system 400 that employs the active shutter glasses method, and the projector 500 projects the images for the right eye and the left eye without any sense of incongruity by boost control and projects them in three dimensions, the projector system 400 can be cooled due to some trouble. When it disappears, the brightness difference controlled by the boost control is reduced according to the temperature rise in the projector 500. Therefore, the projector 500 can avoid a failure due to overheating, and can continue projection without degrading the quality of the three-dimensional image.

As mentioned above, although this invention was demonstrated based on embodiment shown in figure, this invention is not limited to this embodiment, The modification as described below can also be assumed.
When 3D display and 2D display are mixed like movie content, it is determined whether or not the image signal 502 to be projected is a 3D display scene, and if it is a scene corresponding to 3D display, boost control is performed. If the scene is not compatible with three-dimensional display, the applied voltage V may be decreased as the temperature rises, and a mode in which a constant applied voltage V is applied regardless of the temperature can be assumed.
In addition, a mode in which a third period exists between the first period and the second period can be assumed. In this case, in the third period, control different from the control of the applied voltage V in the first period and the second period may be performed.
Further, it is possible to assume a mode in which the projector 500 projects from the back of the screen 700. Further, the projector 500 is not limited to the liquid crystal projector method employed in the present embodiment, and may be a DLP projector method, an LCOS projector method, or the like.

Moreover, the apparatus which implements the above methods may be realized by a single apparatus or may be realized by combining a plurality of apparatuses, and includes various aspects.
Each configuration in each embodiment and a combination thereof are examples, and addition, omission, replacement, and other changes of the configuration can be made without departing from the spirit of the present invention. In addition, the present invention is not limited to the embodiments, and is limited only by the scope of the claims.

  DESCRIPTION OF SYMBOLS 10 ... Discharge lamp lighting device, 50 ... Subreflector, 80 ... DC power supply device, 90 ... Discharge lamp, 90e1 ... 1st edge part, 90e2 ... 2nd edge part, 91 ... Discharge space, 92 ... 1st electrode, 93 ... Second electrode 112 ... Main reflector 114 ... fixing member 200 ... light source device 210 ... light source unit 305 ... parallelizing lens 310 ... illumination optical system 320 ... color separation optical system 330R, 330G, 330B Liquid crystal light valve, 340 Cross dichroic prism, 350 Projection optical system, 400 Projector system, 410 Active shutter glasses, 412 Right shutter, 414 Left shutter, 500 Projector, 502 Image signal, 510 Image Signal conversion unit, 512R, 512G, 512B ... image signal, 522 ... fixing member, 534 ... conductive member, 53 ... 1st terminal, 544 ... Conductive member, 546 ... 2nd terminal, 560R, 560G, 560B ... Liquid crystal panel, 570 ... Image processing device, 572R, 572G, 572B ... Drive signal, 580 ... Control part, 582 ... Light source drive Control unit, 584 ... timing control unit, 590 ... temperature detection unit, 595 ... cooling device, 600 ... AC power supply, 700 ... screen.

Claims (6)

A light emitting means for emitting light at a luminance corresponding to an applied voltage as a light source for projecting an image;
Detecting means for detecting a temperature change of the light emitting means;
When the video is a 3D video, the video for the right eye and the video for the left eye are alternately switched at a predetermined switching timing according to the video, and a period between the switching timings that are temporally adjacent is started in the first period, Switching control means for controlling to end in the second period;
Applied voltage control means for controlling the applied voltage in the second period to be higher than the applied voltage in the first period, and increasing or decreasing the applied voltage in at least the second period according to the temperature change; A projection apparatus comprising: The projection device according to claim 1,
The applied voltage control means, when the detecting means detects the temperature change, based on a first correlation indicating a relation between the temperature change and the applied voltage in the second period, A projection apparatus that determines the applied voltage. The projection apparatus according to claim 2,
When the image is not a 3D image, the applied voltage control unit controls the applied voltage in the first period and the second period to be the same, and when the detection unit detects a temperature rise, The projection apparatus, wherein the applied voltage is determined based on a second correlation indicating a relationship between the temperature change and the same applied voltage. The projection apparatus according to claim 3.
The rate of change of the same applied voltage with respect to the temperature change in the second correlation is greater than the rate of change of the applied voltage in the second period with respect to the temperature change in the first correlation. Projection device. The projection apparatus according to claim 3.
The detecting means can detect the temperature of the light emitting means,
When the temperature detected when the video is a 3D video and the temperature detected when the video is not a 3D video are the same, the applied voltage in the second period is higher than the same applied voltage. A projection apparatus characterized by the above. The projection apparatus according to claim 3.
The projection apparatus, wherein the first correlation and the second correlation are stored in a table format.

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