Display device and display control method

Abstract

The present invention provides a display device and a display control method that can suppress burn-in of the display panel, even when multiple still images are displayed in a cycle and the display time of each still image is short. [Solution] The display device comprises a display panel for displaying an image and a control unit, the control unit determines whether the image is a still image or a moving image, increases a first count as time passes during a first period in which it is determined that the image is a still image, increases a second count as time passes during a second period in which it is determined that the image is a moving image, initializes the first count in response to the second count reaching a second set value, and lowers the brightness of the image in response to the first count reaching a first set value.

Description

Technical Field

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[0001] The present disclosure relates to a display device and a display control method.

Background Art

[0002] Patent Document 1 discloses a color television receiver. In the color television receiver, when the subtraction data of the pixel data of a field and the pixel data of the previous field is zero during a time Tm, the video is regarded as a still image, and when the subtraction data becomes non-zero before the elapse of the time Tm, the video is regarded as a moving image. When the video is regarded as a still image, the contrast of the video is lowered, and when the video is regarded as a moving image, the contrast of the video is not lowered. Thereby, it is possible to prevent the phosphor burn-in of the CRT in advance (paragraphs 0008-0011).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the color television receiver disclosed in Patent Document 1, when a plurality of still images are cyclically displayed and the time for displaying one still image is shorter than the time Tm, the video is not regarded as a moving image, and the contrast of the video is not lowered. Therefore, in the color television receiver, when a plurality of still images are cyclically displayed and the time for displaying one still image is shorter than the time Tm, there is a possibility that phosphor burn-in of the CRT may occur.

[0005] One aspect of this disclosure has been made in view of this problem. One aspect of this disclosure provides a display device and a display control method that can suppress burn-in of the display panel, for example, when multiple still images are displayed in a cycle and the time for which one still image is displayed is short. [Means for solving the problem]

[0006] A display device according to one aspect of the present disclosure comprises a display panel for displaying an image and a control unit, wherein the control unit determines whether the image is a still image or a moving image, increases a first count as time progresses during a first period in which it is determined that the image is a still image, increases a second count as time progresses during a second period in which it is determined that the image is a moving image, initializes the first count in response to the second count reaching a second set value, and lowers the brightness of the image in response to the first count reaching a first set value.

[0007] A display control method in another aspect of the present disclosure includes determining whether an image is a still image or a moving image; increasing a first count as time elapses during a first period in which the image is determined to be a still image; increasing a second count as time elapses during a second period in which the image is determined to be a moving image, and initializing the first count in response to the second count reaching a second set value; and lowering the brightness of the image in response to the first count reaching a first set value. [Brief explanation of the drawing]

[0008] [Figure 1] This is a block diagram of the display device according to the first embodiment, as well as the cables and equipment connected to the display device. [Figure 2] This diagram illustrates the transitions in the images displayed on a display device when a screen saver is displayed on that device. [Figure 3] This diagram shows a panel control unit included in the example display device. [Figure 4] This graph shows the time change of the waiting time count managed by the panel control unit provided in the reference example display device when the video transition exemplified in Figure 2 occurs. [Figure 5A] This figure illustrates a situation in which a display panel provided in a reference example display device has burn-in, and a signal is input to the display device to display a gray screen with a grayscale value of 12 / 255. [Figure 5B] This figure illustrates a situation in which a display panel provided in a reference example display device has burn-in, and a signal is input to the display device to display a gray screen with a grayscale value of 15 / 255. [Figure 5C] This figure illustrates a situation in which a display panel provided in a reference example display device has burn-in, and a signal is input to the display device to display a gray screen with a grayscale value of 30 / 255. [Figure 6] This figure shows a panel control unit provided in the display device of the first embodiment. [Figure 7] This graph shows the time change of the waiting time count managed by the panel control unit provided in the display device of the first embodiment when the video transition exemplified in Figure 2 occurs. [Figure 8] This graph shows the time change of the release count managed by the panel control unit provided in the display device when the transition of the video exemplified in Figure 2 occurs in the display device of the first and second embodiments. [Figure 9] This figure illustrates the transition of images displayed on the display device of the first embodiment when the transition of images exemplified in Figure 2 continues for a long period of time. [Figure 10] This flowchart shows the processing flow performed by the panel control unit provided in the display device of the first embodiment. [Figure 11]This graph shows the time change of the waiting time count managed by the panel control unit provided in the display device of the second embodiment when the video transition exemplified in Figure 2 occurs. [Figure 12] This flowchart shows the processing flow performed by the panel control unit provided in the display device of the second embodiment. [Modes for carrying out the invention]

[0009] The embodiments of this disclosure will be described below with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[0010] 1. First Embodiment 1.1 Display device Figure 1 is a block diagram of the display device according to the first embodiment, as well as the cables and equipment connected to the display device.

[0011] The display device 1 of the first embodiment shown in Figure 1 is, for example, a television receiver. When the display device 1 is a television receiver, the display device 1 receives broadcast waves by connecting, for example, an antenna terminal provided on the wall of a building to an antenna terminal provided on the television receiver with an antenna cable, displays images corresponding to the received broadcast waves, and outputs sound corresponding to the broadcast waves. The display device 1 is equipped with a signal input terminal 101. The display device 1 displays images corresponding to a signal 131 input to the signal input terminal 101 and outputs sound corresponding to the signal 131. The signal input terminal 101 is a High-Definition Multimedia Interface (HDMI®) terminal, a DisplayPort (DP) terminal, a Digital Visual Interface (DVI) terminal, a Universal Serial Bus (USB) terminal, a D-subminiature (D-sub) terminal, etc.

[0012] As shown in Figure 1, the display device 1 includes a signal input terminal 101, a control unit 102, and a display panel 103. The control unit 102 includes a main control unit 111 and a panel control unit 112.

[0013] A device 122 is electrically connected to a signal input terminal 101 via a cable 121. The device 122 outputs a signal 131. The cable 121 transmits the output signal 131 from the device 122 to the signal input terminal 101. The transmitted signal 131 is input to the signal input terminal 101. The device 122 is a personal computer, a game console, a player, a tuner, or the like.

[0014] The main control unit 111 generates a video signal 132 from the input signal 131. The video signal 132 includes a signal representing the pixel value of each of a plurality of pixels provided in the display panel 103. The pixel value is an integer value between 0 and 255 inclusive. The pixel value may be a value other than an integer value between 0 and 255 inclusive.

[0015] The panel control unit 112 generates a drive signal 133 from the generated video signal 132.

[0016] As shown in FIG. 1, the panel control unit 112 includes a determination unit 141. The determination unit 141 determines whether the video displayed on the display panel 103 is a still image or a moving image based on the video signal 132. When the state in which it is determined that the video is a still image continues for a long time, the panel control unit 112 lowers the brightness of the video. Thereby, it is possible to suppress the state in which a still image having high brightness is continuously displayed on the display panel 103 for a long time. Thereby, it is possible to suppress burn-in of the display panel 103.

[0017] The main control unit 111 and the panel control unit 112 are electronic circuits. All or part of the processing performed by the main control unit 111 and the panel control unit 112 may be performed by a microcontroller. The microcontroller includes a processor and a memory. The processor executes a program stored in the memory to perform processing.

[0018] The display panel 103 displays an image corresponding to the generated drive signal 133. The display panel 103 is an organic light-emitting diode (OLED) display panel. The display panel 103 may be a display panel other than an OLED display panel. For example, the display panel 103 may be a liquid crystal display panel.

[0019] 1.2 Screen saver Figure 2 illustrates the transition of images displayed on a display device when a screen saver is displayed on the device.

[0020] In the video transition illustrated in Figure 2, four still images 151, 152, 153, and 154 are displayed cyclically, and a video is displayed on the display device 1 between the display of two still images. Each of the four still images 151, 152, 153, and 154 is displayed for 5 seconds. The video is displayed for 3 seconds. The average image level (APL) of the four still images 151, 152, 153, and 154 is A, B, C, and D, respectively. The 3 seconds for the video means, for example, that still image 151 displayed on the display device 1 slides to the right, and in response to that movement, still image 152 slides in from the left of the display device 1 and is displayed on the display device 1. This operation takes 3 seconds, and the state is judged as a video because of the sliding motion.

[0021] 1.3 Waiting time count and release count Figure 3 shows a panel control unit provided in the reference example display device.

[0022] In the example display device, as shown in Figure 3, the panel control unit 912 manages the standby time count 961 and the set value 963.

[0023] The standby time count 961 indicates the duration during which the image displayed on the display panel remains a still image. The standby time count 961 is immediately reset to its initial value of "0 seconds" when the state in which the image remains a still image ends.

[0024] The setting value 963 is compared to the standby time count 961. The setting value 963 represents the standby time count 961 required to lower the brightness of the image displayed on the display panel. The setting value 963 is, for example, "60 seconds".

[0025] During the first period in which the panel control unit 912 determines that the image displayed on the display panel is a still image, it increases the waiting time count 961 as time progresses.

[0026] During the second period in which the panel control unit 912 determines that the image displayed on the display panel is a video, it maintains the waiting time count 961 at its initial value of "0 seconds".

[0027] The panel control unit 912 reduces the brightness of the image displayed on the display panel in response to the standby time count 961 reaching the set value 963, which is "60 seconds".

[0028] Figure 4 is a graph showing the time change of the standby time count managed by the panel control unit provided in the reference example display device when the video transition exemplified in Figure 2 occurs. In the graph of Figure 4, the horizontal axis represents time, and the vertical axis represents the standby time count.

[0029] In the example display device, if the video transition exemplified in Figure 2 occurs, as shown in Figure 4, the standby time count 961 increases from "0 seconds" to "5 seconds" in each first period 971 when the video displayed on the display panel is determined to be a still image, but is initialized to the initial value of "0 seconds" in each second period 972 when the video is determined to be a moving image. Therefore, the standby time count 961 does not reach the set value 963 of "60 seconds". As a result, the brightness of the video does not decrease. Therefore, the video transition exemplified in Figure 2 continues for a long time with the brightness of the video remaining high. As a result, burn-in may occur on the display panel.

[0030] Figure 5A illustrates the state of the display panel of the reference example when burn-in has occurred on the display panel and a signal is input to the display device to display a gray screen with a grayscale value of 12 / 255. Figure 5B illustrates the state of the display panel of the reference example when burn-in has occurred on the display panel and a signal is input to the display device to display a gray screen with a grayscale value of 15 / 255. Figure 5C illustrates the state of the display panel of the reference example when burn-in has occurred on the display panel and a signal is input to the display device to display a gray screen with a grayscale value of 30 / 255.

[0031] As illustrated in Figures 5A to 5C, if burn-in occurs on the display panel, even though a signal to display a gray screen is input to the display device, the display panel will show a gray screen 991 and a burned-in still image 992 from a previously displayed image superimposed on it.

[0032] Figure 6 shows a panel control unit provided in the display device of the first embodiment.

[0033] In the display device 1 of the first embodiment, as shown in Figure 6, the panel control unit 112 manages the standby time count 161, the release count 162, the first set value 163, and the second set value 164.

[0034] The standby time count 161 indicates the duration for which the image displayed on the display panel 103 remains a still image. The standby time count 161 is not immediately reset to its initial value of "0 seconds" even after the state in which the image remains a still image ends.

[0035] The release count 162 indicates the duration for which the video displayed on the display panel 103 remains in a video state. The release count 162 is immediately reset to its initial value of "0 seconds" when the video state ends.

[0036] The first setting value 163 is compared with the standby time count 161. The first setting value 163 indicates the standby time count 161 required to lower the brightness of the image displayed on the display panel 103. The first setting value 163 is, for example, "60 seconds". The first setting value 163 may be a setting value other than "60 seconds".

[0037] The second setting value 164 is compared with the release count 162. The second setting value 164 indicates the release count 162 required to initialize the waiting time count 161. The second setting value 164 is, for example, "10 seconds". The second setting value 164 may be a setting value other than "10 seconds".

[0038] During the first period in which the panel control unit 112 determines that the image displayed on the display panel 103 is a still image, it increases the waiting time count 161 as time progresses and initializes the release count 162 to its initial value of "0 seconds".

[0039] The panel control unit 112, during a second period in which it determines that the image displayed on the display panel 103 is a video, increases the release count 162 as time passes, and holds the waiting time count 961 until the release count 162 reaches the second setting value 164, which is "10 seconds". In response to the release count 162 reaching the second setting value 164, which is "10 seconds", it initializes the waiting time count 161 to its initial value of "0 seconds". As a result, when the image changes from a still image to a video, the waiting time count 161 is not initialized to its initial value of "0 seconds" until the second setting value 164, which is "10 seconds", has elapsed, and in response to the elapsed second setting value 164, which is "10 seconds", the waiting time count 161 is initialized to its initial value of "0 seconds".

[0040] In response to the standby time count 161 reaching the first set value 163, "60 seconds", the panel control unit 112 lowers the brightness of the image displayed on the display panel 103.

[0041] The first setting value 163 is greater than the second setting value 164. As long as the condition that the first setting value 163 is greater than the second setting value 164 is met, the first setting value 163 may be a setting value other than "60 seconds", and the second setting value 164 may be a setting value other than "10 seconds".

[0042] Figure 7 is a graph showing the time change of the standby time count managed by the panel control unit provided in the display device of the first embodiment when the video transition exemplified in Figure 2 occurs. Figure 8 is a graph showing the time change of the release count managed by the panel control unit provided in the display device of the first embodiment when the video transition exemplified in Figure 2 occurs. In the graph of Figure 7, the horizontal axis represents time and the vertical axis represents the standby time count. In the graph of Figure 8, the horizontal axis represents time and the vertical axis represents the release count.

[0043] In the display device 1 of the first embodiment, when the video transition illustrated in Figure 2 occurs, as shown in Figure 8, the release count 162 is initialized to its initial value of "0 seconds" in each first period 171 when it is determined that the video displayed on the display panel 103 is a still image, but increases from "0 seconds" to "3 seconds" in each second period 172 when it is determined that the video is a moving image. Therefore, the release count 162 does not reach the second setting value 164, which is "10 seconds". Also, as shown in Figure 7, the waiting time count 161 increases from "0 seconds" to "5 seconds" in the first first period 171, and is not initialized to its initial value of "0 seconds" in the subsequent first second period 172, and is held without increasing or decreasing. Therefore, the waiting time count 161 accumulates each time the first period 171 arrives and reaches the first setting value 163, which is "60 seconds". When the waiting time count 161 reaches the first set value 163, "60 seconds," the panel control unit 112 lowers the brightness of the image, thereby preventing the image transitions exemplified in Figure 2 from continuing for a long time while the brightness of the image remains high. This prevents image burn-in from occurring on the display panel 103.

[0044] Figure 9 illustrates the transition of images displayed on the display device of the first embodiment when the transition of images exemplified in Figure 2 continues for a long period of time.

[0045] In the display device 1 of the first embodiment, as illustrated in Figure 9, even if the transition of the video illustrated in Figure 2 continues for a long time, a change occurs in the brightness of the video displayed on the display panel 103 from a high brightness state 181 to a low brightness state 182. This makes it possible to suppress burn-in on the display panel 103. In Figure 9, although only 8 still images are drawn in the high brightness state, the switch to the low brightness state 181 does not occur when the standby count 161 reaches 40 seconds. Rather, even in the part omitted by the broken line in the upper left, 4 still images are switched with a video in between, so the switch to the low brightness state 181 occurs when the standby count 161 reaches 60 seconds.

[0046] 1.4 Processing Flow Figure 10 is a flowchart showing the processing flow performed by the panel control unit provided in the display device of the first embodiment.

[0047] The panel control unit 112 executes steps S101 to S107 shown in Figure 10.

[0048] In step S101, the panel control unit 112 determines whether the image displayed on the display panel 103 is a still image or not. The panel control unit 112 acquires the APL of the image and determines whether the image is a still image or not based on the acquired APL. For example, if the variation value, which indicates the difference between the APL acquired previously and the APL acquired now, is less than or equal to value α, the panel control unit 112 determines that the image is a still image, and if the variation value is greater than value α, it determines that the image is a moving image and not a still image. If the panel control unit 112 determines that the image is a still image, it executes step S102. If the panel control unit 112 determines that the image is not a still image, it executes step S105.

[0049] In step S102, the panel control unit 112 increases the standby time count 161 by one step and initializes the release count 162 to its initial value of "0 seconds".

[0050] In steps S101 and S102, the panel control unit 112 increases the waiting time count 161 by one step as time elapses during the first period 171 in which the image displayed on the display panel 103 is a still image. For example, the waiting time count 161 is increased by one step (1 second) for every 1 second that passes. In response to the end of the second period 172 in which the image is a moving image and the start of the first period 171 in which it was determined that the image is a still image, the panel control unit 112 initializes the release count 162 to its initial value of "0 seconds".

[0051] In the following step S103, the panel control unit 112 determines whether the waiting time count 161 has reached the first set value 163, which is "60 seconds". If the panel control unit 112 determines that the waiting time count 161 has reached the first set value 163, it executes step S104 and then step S101. If the panel control unit 112 determines that the waiting time count 161 has not reached the first set value 163, it executes step S101 without executing step S104.

[0052] In step S104, the panel control unit 112 sets the still image flag to "High" and lowers the brightness of the image displayed on the display panel 103 to a lower level than the standard brightness. When the still image flag is set to "High", it indicates that the panel control unit 112 has determined that the image is a still image.

[0053] In steps S101 to S104, the panel control unit 112 repeatedly increases the standby time count 161 by one step until the standby time count 161 reaches the first set value 163, which is "60 seconds," when the image displayed on the display panel 103 is a still image. In response to the standby time count 161 reaching the first set value 163, the control unit starts to lower the brightness of the image.

[0054] In step S105, the panel control unit 112 holds the standby time count 161 without increasing or decreasing it, and increases the release count 162 by one step.

[0055] In steps S101 and S105, the panel control unit 112 increases the release count 162 by one step as time progresses during the second period 172 in which the image displayed on the display panel 103 is a moving image. For example, the release count 162 is increased by one step (1 second) for every 1 second that passes.

[0056] In the following step S106, the panel control unit 112 determines whether the release count 162 has reached the second set value 164, which is "10 seconds". If the panel control unit 112 determines that the release count 162 has reached the second set value 164, it executes step S107 and then step S101. If the panel control unit 112 determines that the release count 162 has not reached the second set value 164, it executes step S101 without executing step S107.

[0057] In step S107, the panel control unit 112 finishes setting the still image flag to "Low" and lowering the brightness of the image displayed on the display panel 103 to a lower level than the standard brightness, and initializes the waiting time count 161 to its initial value of "0 seconds".

[0058] In steps S101 and S105 to S107, the panel control unit 112 repeatedly increases the release count 162 by one step until the release count 162 reaches the second set value 164, if the image displayed on the display panel 103 is a moving image. In response to the release count 162 reaching the second set value 164, it terminates lowering the brightness of the image and initializes the standby time count 161 to its initial value of "0 seconds".

[0059] 2. Second Embodiment The following describes the differences between the second embodiment and the first embodiment. For aspects not described, the second embodiment employs the same configuration as the first embodiment.

[0060] In the second embodiment, the waiting time count 161 represents the sum of the time during which the image displayed on the display panel 103 is a still image and the time during which the image is a moving image. The waiting time count 161 is not immediately reset to its initial value of "0 seconds" even when the state in which the image is a still image ends.

[0061] In the second embodiment, the panel control unit 112, during a second period in which it determines that the image displayed on the display panel 103 is a video, increases the waiting time count 161 as time elapses until the release count 162 reaches the second set value 164, which is "10 seconds," and initializes the waiting time count 161 to its initial value of "0 seconds" in response to the release count 162 reaching the second set value 164.

[0062] Figure 11 is a graph showing the time change of the standby time count managed by the panel control unit provided in the display device of the second embodiment when the video transition exemplified in Figure 2 occurs. Figure 8 is also a graph showing the time change of the release count managed by the panel control unit provided in the display device of the second embodiment when the video transition exemplified in Figure 2 occurs. In the graph of Figure 11, the horizontal axis represents time and the vertical axis represents the standby time count.

[0063] In the display device 1 of the second embodiment, when the video transition exemplified in Figure 2 occurs, as shown in Figure 8, the release count 162 increases from "0 seconds" to "3 seconds" in each second period 172 when it is determined that the video displayed on the display panel 103 is a video, but is initialized to the initial value of "0 seconds" in each first period 171 when it is determined that the video is a still image. Therefore, the release count 162 does not reach the second setting value 164, which is "10 seconds". Also, as shown in Figure 11, the waiting time count 161 increases from "0 seconds" to "5 seconds" in the first first period 171 when it is determined that the video is a still image, and in the first second period 172 when it is determined that the video is a video, it is not initialized to the initial value of "0 seconds", but further increases from "5 seconds" to "8 seconds". The waiting time count 161 also increases further in the second and subsequent first periods 171 and second periods 172. Therefore, the waiting time count 161 accumulates each time the first period 171 and the second period 172, in which the image is determined to be a still image, are repeated, until it reaches the first set value 163, which is "60 seconds". When the waiting time count 161 reaches the first set value 163, which is "60 seconds", the panel control unit 112 lowers the brightness of the image, thereby preventing the image transition exemplified in Figure 2 from continuing for a long time while the brightness of the image remains high. Therefore, burn-in on the display panel 103 can be suppressed. In the second embodiment, the waiting time count 161 also increases in the second period 172, so the brightness of the image can be lowered earlier compared to the first embodiment. Therefore, when the image transition exemplified in Figure 2 occurs, the second embodiment can suppress burn-in on the display panel 103 more effectively than the first embodiment.

[0064] Figure 12 is a flowchart showing the processing flow performed by the panel control unit provided in the display device of the second embodiment.

[0065] In the second embodiment, the panel control unit 112 performs steps S111 to S117 shown in Figure 12.

[0066] In step S111, similar to step S101, the panel control unit 112 determines whether the image displayed on the display panel 103 is a still image. If the panel control unit 112 determines that the image is a still image, it executes step S112. If the panel control unit 112 determines that the image is not a still image, it executes step S115.

[0067] In step S112, similar to step S102, the panel control unit 112 increases the standby time count 161 by one step and initializes the release count 162 to its initial value of "0 seconds".

[0068] In steps S111 and S112, the panel control unit 112 increases the waiting time count 161 by one step as time elapses during the first period 171 in which the image displayed on the display panel 103 is a still image. For example, the waiting time count 161 is increased by one step (1 second) for every 1 second that passes. In response to the end of the second period 172 in which the image is a moving image and the start of the first period 171 in which it was determined that the image is a still image, the panel control unit 112 initializes the release count 162 to its initial value of "0 seconds".

[0069] In the following step S113, similar to step S103, the panel control unit 112 determines whether the waiting time count 161 has reached the first set value 163, which is "60 seconds". If the panel control unit 112 determines that the waiting time count 161 has reached the first set value 163, it executes step S114 and then step S111. If the panel control unit 112 determines that the waiting time count 161 has not reached the first set value 163, it executes step S111 without executing step S114.

[0070] In step S114, similar to step S104, the panel control unit 112 sets the still image flag to "High" and lowers the brightness of the image displayed on the display panel 103 to a lower level than the standard brightness.

[0071] In step S115, the panel control unit 112 increases the standby time count 161 by one step and increases the release count 162 by one step.

[0072] In steps S111 and S115, the panel control unit 112 increases the standby time count 161 by one step as time progresses during the second period 172 in which the image displayed on the display panel 103 is a moving image, and increases the release count 162 by one step as time progresses. For example, the standby time count 161 is increased by one step (one second) for every one second that passes, and the release count 162 is increased by one step (one second) for every one second that passes.

[0073] In the following step S116, the panel control unit 112 determines whether the release count 162 has reached the second set value 164, which is "10 seconds". If the panel control unit 112 determines that the release count 162 has reached the second set value 164, it executes step S117 and then step S111. If it determines that the release count 162 has not reached the second set value 164, it executes step S113.

[0074] In step S117, similar to step S107, the panel control unit 112 finishes setting the still image flag to "Low" and lowering the brightness of the image displayed on the display panel 103 to a lower level than the standard brightness, and initializes the waiting time count 161 to its initial value of "0 seconds".

[0075] In steps S111 and S115 to S117, the panel control unit 112 repeatedly increases the release count 162 by one step until it reaches the second set value 164, if the image displayed on the display panel 103 is a moving image. In response to the release count 162 reaching the second set value 164, it stops lowering the brightness of the image displayed on the display panel 103 to a lower brightness than the standard brightness and initializes the standby time count 161 to its initial value of "0 seconds".

[0076] Furthermore, in steps S111 and S115 to S117, the panel control unit 112 repeatedly increases the standby count 161 by one step until the standby time count 161 reaches the first set value 163, if the image displayed on the display panel 103 is a moving image. Therefore, if it is determined in step S116 that the release count 162 has not reached the second set value 164, step S113 is executed, and in the display device 1 of the second embodiment, the brightness of the image may be lowered even during the second period 172 in which the image displayed on the display panel 103 is a moving image. Thus, the brightness of the image can be lowered earlier compared to the first embodiment, and when the image transitions illustrated in Figure 2 occur, the second embodiment can suppress burn-in on the display panel 103 more effectively than the first embodiment.

[0077] This disclosure is not limited to the embodiments described above, and may be replaced with configurations that are substantially the same as those shown in the embodiments, configurations that produce the same effects, or configurations that can achieve the same purpose. [Explanation of Symbols]

[0078] 1 Display device 101 Signal input terminal 102 Control Unit 103 Display Panel 111 Main Control Unit 112 Panel Control Unit 121 Cable 122 Equipment 131 Signal 132 Video signal 133 Drive signal 141 Judgment Department 151, 152, 153, 154 Still images 161 Waiting time count 162 Unlock count 163 First setting value 164 Second setting value 171 The first period 172 Second period 181 Status 182 Status 912 Panel Control Unit 961 Waiting time count 963 Setting value 971 First period 972 Second period 991 Gray screen 992 seized

Claims

1. A display panel that displays images, Control unit and Equipped with, The control unit, Determine whether the aforementioned image is a still image or a video. During the first period in which it is determined that the video is a still image, the first count is increased as time progresses. During the second period in which it is determined that the video is the video, the second count is increased as time progresses, and the first count is initialized in response to the second count reaching a second set value. The brightness of the image is reduced in response to the first count reaching a first set value. Display device.

2. The control unit, during the second period, holds the first count until the second count reaches the second set value, or increases the first count as time elapses. The display device according to claim 1.

3. The first setting value is greater than the second setting value. The display device according to claim 2.

4. The control unit terminates lowering the brightness of the image in response to the second count reaching the second set value. The display device according to any one of claims 1 to 3.

5. The control unit initializes the second count in response to the start of the first period. The display device according to claim 4.

6. The control unit initializes the second count in response to the start of the first period. The display device according to any one of claims 1 to 3.

7. To determine whether the image is a still image or a video, In the first period during which it is determined that the video is a still image, the first count is increased as time progresses, During the second period in which it is determined that the aforementioned image is the aforementioned video, the second count is increased as time progresses, and the first count is initialized in response to the second count reaching a second set value. The brightness of the image is reduced in response to the first count reaching a first set value, A display control method including the following.

Images