JP4678134B2 - Display seizure prevention device and display - Google Patents

Description

  The present invention relates to a display burn-in prevention device that is applied to a display (display device) such as a plasma display and prevents the display cells on which dots are displayed on the display from being burned.

  In general, when a content to be displayed is unchanged for a long time, a display causes a phenomenon called “burning” in which a display material of a display cell in which dot display is performed deteriorates. If seizure occurs, the display quality of the display deteriorates.

  In particular, relatively large plasma displays used in street or indoor advertisements and posting services, sometimes called electronic posters, etc., are easy to burn due to their specifications, and the same content for a long time in advertisements and posting services. Since the display is often performed, the image sticking is particularly likely to occur.

  In addition, as a measure to prevent display burn-in, a function called a screen saver that automatically switches to an image whose display content (high brightness area) changes to low brightness after displaying the desired display content for a certain period of time, or sets the brightness to zero. There are many examples of mounting on the display.

  In claim 2, FIG. 4 and FIG. 11 of Patent Document 1, there is a liquid crystal display device which is a combination of a transmissive liquid crystal and a reflective liquid crystal and adjusts the luminance of the backlight according to the external light. It is disclosed. Further, claim 1 of Patent Document 2 discloses a technique for integrating the total lighting time of display cells (pixels) and adjusting the brightness of the backlight up and down according to the time. Furthermore, FIG. 3 of Patent Document 3 discloses a technique in which luminance sensors are provided at the four corners on the front surface of the display and the luminance is corrected according to the measured values of these sensors. Further, FIG. 1 and paragraphs 0030 to 0032 of Patent Document 4 disclose a technique for adjusting a luminance manufacturing error between an input signal and an output signal of a display for the purpose of color matching.

JP 2000-122574 A JP 2000-132139 A JP 2001-045327 A JP 2003-058127 A

  However, since the screen saver function described above is simply operated by a timer, the display schedule and contents of the display contents are completely ignored, and the display corresponding to the desired advertisement and notice including the advertisement and notice service described above. It is unsuitable for applications in which content is displayed for a long time without pausing.

  In addition, the seizure prevention process schedule once set must be set by the operator each time, and it is difficult for the operator to confirm display display and set the seizure prevention process during the operation period.

  The problem was that display burn-in could only be confirmed by visual confirmation by the operator or audience. For this reason, it was difficult for the audience to use it as an advertising display for public places.

  In addition, when there is no operator, the display is kept burnt without noticing the burn-in of the display, and it is a problem that the user can not maintain satisfactory quality for displaying advertisements such as electronic posters. .

  In addition, in the technique described in patent document 1, there is no description or suggestion regarding the seizure prevention function, and the seizure prevention effect is not exhibited at all. In addition, the technique described in Patent Document 2 cannot cope with individual differences between devices and image-specific printing. Furthermore, in the technique described in Patent Document 3, the detection accuracy of the four optical sensors is poor, and it is not possible to cope with individual differences between devices and printing inherent to a display image. Moreover, in the technique described in Patent Document 4, not only the description but also no suggestion regarding seizure prevention is provided.

  Therefore, an object of the present invention is suitable for a purpose of continuously displaying a display content corresponding to a desired advertisement or posting without pausing for a long time, and a display burn-in prevention device capable of accurately detecting burn-in, It is to provide a display having.

  According to the present invention, a plurality of photosensors arranged so as to be adjacent to each display cell between a plurality of display cells of the display, a predetermined brightness value for each display cell, and a brightness for each display cell by the photosensor And a display control circuit that adjusts at least one of luminance and color for each display cell based on a difference from the actual measurement value.

  According to the present invention, it is also possible to obtain the display burn-in prevention device and the display burn-in prevention device that outputs a warning when the luminance difference between the scheduled value and the actual measurement value is equal to or greater than a predetermined value.

  Further, according to the present invention, the display control circuit can provide the display anti-seize device and the display anti-seize device that stops the display on the display when the number of times of the warning is equal to or greater than a predetermined number.

  In addition, according to the present invention, there can be obtained the display burn-in prevention device further including a luminance detection circuit that measures the luminance of each display cell by the optical sensor at a predetermined time interval.

  Furthermore, according to the present invention, the display burn-in prevention device can be obtained in which the display control circuit outputs the warning to the outside via a communication network.

  Moreover, according to this invention, the said optical sensor can obtain the said display image sticking prevention apparatus arrange | positioned between the said display cells of a display.

  Moreover, according to this invention, the display which has the said display image sticking prevention apparatus is obtained.

  Moreover, according to this invention, the said display which is a plasma display, a liquid crystal display, or EL (Electro Luminescence) display is obtained.

  The first effect of the present invention is suitable for an application in which display content corresponding to a desired advertisement or posting is displayed for a long time without pausing, and burn-in can be accurately detected.

  The second effect is that the burn-in state of the display can be confirmed unattended. For this reason, it is not necessary for the operator to check the burn-in state of the display exclusively for display applications such as advertisement display.

  The third effect is that it is possible to detect the occurrence of a temporary abnormality in the display. Since the timer always checks and compares the display contents on the display, it is possible to detect more than the image signal disturbance in addition to the burn-in and the life.

  The fourth effect is that light information is directly output from the light recognition device to the display control circuit and compared, so that even if there is a sign of seizure, the sign is automatically judged, and anti-seize processing is automatically executed. Is what you can do.

  The fifth effect is that when the light information does not match, the burn-in mitigation process is automatically executed from the display control circuit, so that the burn-in countermeasure can be executed quickly, and the display life can be extended. It is to become.

  Thus, according to the present invention, application to a display where occurrence of image sticking is considered is conceivable. Anti-seizure treatment can be performed automatically, so if there is no operator such as a public place that needs to be operated unattended or a special high-altitude display, operation and setting are difficult. It is possible to perform display on the display while preventing this.

  Hereinafter, a display burn-in prevention device according to the present invention will be described with reference to the drawings.

  Referring to FIG. 1A and FIG. 2, the present display burn-in prevention device includes a plurality of lights arranged so as to be adjacent to each display cell 100a between a plurality of display cells 100a of a display 100 which is a plasma display. At least one of the luminance and the color for each display cell 100a is adjusted based on the difference between the sensor 10 and the planned luminance value for each display cell 100a and the actual measured value of the luminance for each display cell 100a by the optical sensor 10. Display control circuit 30.

  The optical sensor 10 is disposed so as to overlap between the electrode portions 100 b between the display cells 100 a of the display 100. As described above, by arranging the optical sensor between the display cells, the user cannot visually recognize the image.

  The display control circuit 30 outputs a warning when the luminance difference between the scheduled value and the actually measured value is greater than or equal to a predetermined value.

  The display control circuit 30 stops the display on the display 100 when the number of warnings is equal to or greater than a predetermined number.

  A luminance detection circuit 20 is further provided for measuring the luminance of each display cell by the optical sensor 10 at a predetermined time interval.

  The display control circuit 30 can output the warning to the outside via a communication network.

  In the present invention, the display is not limited to a plasma display, but may be a display having display cells, and may be a liquid crystal display, an EL (Electro Luminescence) display, or the like.

  A display burn-in prevention device according to an embodiment of the present invention will be described below with reference to the drawings.

  Referring to FIG. 1A, the optical sensor 10 is disposed along the electrode part 100 b on the display 100, and photoelectrically converts the emitted light from the display cell 100 a of the display 100 to the luminance detection circuit 20. Output.

  When the display format is a liquid crystal display, as shown in FIG. 1B, the optical sensor 10 is located between the adjacent display cells 100a on the viewing surface side (upward in the figure) from the backlight 200. It arrange | positions so that it may overlap. When the display format is an organic EL (Electro Luminescence) display, as shown in FIG. 1C, the optical sensor 10 is placed on the electrode portion 100b which is a transparent electrode on the viewing surface side (upper side in the figure). Along the display cells 100a, the display cells 100a are arranged so as to overlap each other. In any case, in the present invention, the optical sensor is disposed between the display cells adjacent to the display surface side, that is, closer to the viewing surface than the light source surface or the light emitting element surface. The EL (Electro Luminescence) display may be either an organic EL display or an inorganic EL display. In the case of a color type display, the display cells usually include cells for each color of R (red), G (green), and B (blue).

  FIG. 2 is a connection configuration diagram including the display 100, the luminance detection circuit 20, the display control circuit 30, the luminance signal cable 40, and the video signal cable 50.

  With reference to FIG. 1A and FIG. 2, the optical sensor 10 on the electrode part 100b between the display cells 100a of the display 100 converts the received light into an electric signal and outputs it to the luminance detection circuit 20.

  The luminance detection circuit 20 digitally converts the signal received from the optical sensor 10 for the display control circuit 30.

  The luminance detection circuit 20 outputs luminance information as a digital signal from the luminance signal cable 40 to the display control circuit 30.

  The display control circuit 30 compares the signal received from the luminance detection circuit 20 with the video signal output from the display control circuit 30 to the display 100.

  In the display control circuit 30, differences in luminance reduction and color reduction due to passing through the optical sensor 10 and the luminance detection circuit 20 are set and stored in advance.

  The display control circuit 30 determines whether or not a difference equal to or larger than a set value is found between the signal from the luminance detection circuit 20 added and compared with the difference in luminance or color reduction and the output video signal.

  When the display content comparison unit 32 of the display control circuit 30 receives the optical information signal from the luminance detection circuit 20 collected every predetermined time by the timer 22 of the luminance detection circuit 20, the display content comparison unit 32 calculates the value at the coordinates of the received optical information. The value of the drive signal output from the display control circuit 30 to the display 100 is compared.

  A determination is made as to whether or not there is a sign of image sticking depending on whether the compared contents are the same or different. If no image burn-in occurs, the count value C1 of the first counter 33 of the display control circuit 30 is incremented by one. And log as normal.

  If the compared contents do not match, an indication of burn-in is found, and a warning is transmitted to the content control unit 35 of the display control circuit 30 or an external management system via a network or the like. At the same time, the fact that they do not match is added to the count value C2 of the second counter 34 by 1 and recorded as a log.

  The content control unit 35 of the display control circuit 30 that has received the warning continues the content display by switching to a display for reducing image sticking, for example, a low luminance or a suppressed color.

  When a series of operations are repeated by the timer 22 operation of the luminance detection circuit 20 and the count value C2 of the second counter 34 of the display control circuit 30 exceeds a certain threshold value L, the display beyond this is severely burned. It is determined that the quality is unbearable, and the display by the content control unit 35 of the display control circuit 30 is stopped.

  FIG. 3 is a flowchart showing the operation of the present apparatus. Hereinafter, the operation of the present apparatus will be described with reference to FIGS.

  The optical sensor 10 senses the luminance and color information of light displayed and output on the display 100 and outputs it to the luminance detection circuit 20 as an analog signal.

  First, as initial setting, luminance information and color information in the initial state of the display 100 are set based on data sent from the optical sensor 10 for the first time.

  The luminance detection circuit 20 receiving the light information signal from the optical sensor 10 in real time senses at a regular time by the timer 22.

  The display content comparison unit 32 of the display control circuit 30 constantly monitors the light input information of the luminance detection circuit 20 and compares the value of the light information in coordinate units. That is, the display control circuit 30 compares the light information sent from the light sensor with the luminance information and color information in the initial state of the display set initially, and determines whether there is a difference between the values.

  If there is no comparison difference, the display control circuit 30 counts the count value C1 of the first counter 33 and records information such as a time stamp as a normal operation log. The display processing of the content displayed through the content control unit 35 is continued as it is.

  If there is a difference, first, if a management server is connected to the display control circuit 30 or beyond by a network or the like, a warning is transmitted to the management server.

  Next, the display control circuit 30 counts the count value C2 of the second counter 34, and records a time stamp or light information that has a difference as an error event log.

  When the count value C2 of the second counter 34 exceeds the number of occurrences of a difference from a preset value such as a threshold value L <C2, the process is switched to a display stop process.

  Referring to FIG. 3, the timer 22 confirms the light information from the luminance detection circuit 20 at regular intervals. The display content comparison unit 32 compares the detection value (H (X, Y)) by the luminance detection circuit 20 and the output signal (D (X, Y)) to the display 100 of the display control circuit 30 in the coordinate unit. The signs of seizure are judged based on whether the values are different.

  A first counter 33 is provided to grasp the normal operation period. If the count value C1 of the first counter 33 is different, the display content comparison unit 32 sends a warning to the content control unit 35, and the management server is operated by the operator of the content control unit 35 or beyond it by a network or the like. Displays a warning to connected operators.

  Further, the fact that there is a difference in the count value C2 of the second counter 34 is recorded. At that time, by recording all necessary information as a log, such as time stamps and values that differ, it is possible to grasp from the log the level of whether it is temporary or if it is seizure that does not reduce even if the seizure mitigation process is executed It is also possible to do. If there is a difference in display content, the content control unit 35 executes a burn-in reduction process to display the content.

  In this embodiment, since the sign of burn-in can be determined in real time and the burn-in mitigation process can be executed when the initial symptoms of burn-in appear, it has the effect of reducing the lifetime reduction of the display.

  In addition, when the difference is determined by comparing the light information, it is possible to determine the lifetime of the backlight by separately managing the luminance information and the color information.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications are possible within the technical scope described in the claims. Needless to say.

It is a schematic perspective view which shows arrangement | positioning of the optical sensor in the display sticking prevention apparatus by this invention, (a) shows the example of arrangement | positioning to a plasma display, (b) shows the example of arrangement | positioning to a liquid crystal display, (c ) Shows an example of arrangement on an EL display. It is a block diagram which shows the structure of the display image sticking prevention apparatus by this invention. It is a flowchart for demonstrating operation | movement of the display sticking prevention apparatus by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical sensor 20 Luminance detection circuit 22 Timer 30 Display control circuit 32 Display content comparison part 33 1st counter 34 2nd counter 35 Content control part 40 Luminance signal cable 50 Video signal cable 100 Display 100a Display cell 100b Electrode part 200 Back Light

Claims (5)

A plurality of photosensors arranged adjacent to each display cell between a plurality of display cells of the display;
A display control circuit that adjusts at least one of brightness and color for each display cell based on a difference between a planned brightness value for each display cell and an actual measurement value of brightness for each display cell by the optical sensor;
The display control circuit includes:
When the brightness difference between the scheduled value and the measured value is less than a predetermined value, it counts as a log of normal operation,
When the brightness difference between the scheduled value and the actual measurement value is equal to or greater than a predetermined value, a warning is output and transmitted to the outside via the communication network, and counted as an error event log,
Furthermore, when the count value of the error event log reaches a predetermined number of times, the display on the display is stopped.   The display burn-in prevention device according to claim 1, further comprising a luminance detection circuit that measures the luminance of each display cell by the optical sensor at a predetermined time interval. The light sensor may display anti-seizing device according to claim 1 or 2 disposed between the display cells of the display. A display comprising the display burn-in prevention device according to any one of claims 1 to 3 . The display according to claim 4 , which is a plasma display, a liquid crystal display, or an EL (Electro Luminescence) display.

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