Display device and display control method

Abstract

To provide a display device capable of reducing a risk of burn-in.SOLUTION: A display device includes a reception part, a display part having a screen, an image quality control part for controlling the image quality of the screen, and a determination part. When the determination unit determines that a static image is to be displayed on the screen (S7: YES), the image-quality control unit performs low-luminance control (S9) in which the brightness is made lower than when the determination unit determines that a moving image is to be displayed on the screen, and does not perform control (S6) of the image-quality of the screen while the low-luminance control is being performed.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] Conventionally, display devices using CRTs (Cathode-Ray Tubes) or OLEDs (Organic Light Emitting Diodes) have had the problem of burn-in when the same still image is continuously displayed on the screen.

[0003] Therefore, for example, Patent Document 1 discloses a technology that prevents burn-in of a CRT by automatically lowering the contrast (brightness) when it is determined that the same high-contrast still image is being displayed on the screen (low brightness control). The low brightness control is released when it is determined that a moving image is being displayed on the screen. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 5-344371 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, there have been display devices that have sensors installed around the screen to detect brightness, color temperature, etc., and that control the brightness of the screen based on the detection results of the sensors. In such display devices, when the sensors detect a change in the environment around the display device, the brightness of the screen is changed in response to the change in the environment.

[0006] In the above-mentioned display device, if the screen brightness is changed due to a change in the environment while low brightness control is being performed as in Patent Document 1, it may be determined that a moving image is being displayed on the screen. In this case, the above-mentioned low brightness control is canceled, which may cause burn-in.

[0007] An object of one aspect of the present disclosure is to provide a display device and a display control method that can reduce the risk of burn-in. [Means for solving the problem]

[0008] In order to solve the above problem, a display device according to one aspect of the present disclosure includes a receiving unit that receives a video signal, a display unit having a screen that displays a video based on the video signal received by the receiving unit, an image quality control unit that controls the image quality of the screen based on environmental information indicating a light condition around the display unit, and a determination unit that determines whether a video or a still image is to be displayed on the screen. When the determination unit determines that the still image is to be displayed on the screen, the image quality control unit executes low-brightness control to lower the luminance of the screen compared to when the determination unit determines that the video is to be displayed on the screen, and does not execute image quality control based on the environmental information while the low-brightness control is being executed.

[0009] In order to solve the above problem, a display device according to one aspect of the present disclosure includes a receiving unit that receives a video signal, a display unit having a screen that displays a video based on the video signal received by the receiving unit, a picture quality control unit that controls the picture quality of the screen based on acquired environmental information indicating the state of light around the display unit, and a determination unit that determines whether a video or a still image is displayed on the screen by determining whether a difference in average luminance between frames of the video is equal to or greater than a still image threshold. When the determination unit determines that the still image is displayed on the screen, the picture quality control unit executes low-luminance control to lower the average luminance of the video compared to when the determination unit determines that the video is displayed on the screen, and when a change in the environmental information is detected during the execution of the low-luminance control, the picture quality control unit changes the average luminance of the image quality by suppressing it to a luminance level lower than the still image threshold.

[0010] In order to solve the above problem, a display control method according to one aspect of the present disclosure includes: a receiving step of receiving a video signal; a display step of displaying a video based on the video signal received in the receiving step on a screen of a display unit; an image quality control step of controlling the image quality of the screen based on acquisition of environmental information indicating a light condition around the display unit; a determination step of determining whether a video or a still image is to be displayed on the screen in the determination step; and a low-brightness control step of lowering the luminance of the screen when it is determined in the determination step that the still image is to be displayed on the screen compared to when it is determined in the determination step that the video is to be displayed on the screen. The image quality control step is not executed while the low-brightness control step is being executed.

[0011] In order to solve the above problem, a display control method according to one aspect of the present disclosure includes: a receiving step of receiving a video signal; a display step of displaying a video based on the video signal received in the receiving step on a screen of a display unit; an image quality control step of controlling the image quality of the screen based on acquiring environmental information indicating the lighting conditions around the display unit; a determination step of determining whether a video or a still image is to be displayed on the screen by determining whether a difference in average luminance between frames of the video is equal to or greater than a still image threshold; and a low-luminance control step of, if it is determined in the determination step that the still image is to be displayed on the screen, lowering the average luminance of the video compared to when it is determined in the determination step that the video is to be displayed on the screen. If a change in the environmental information is detected during the low-luminance control step, the average luminance of the image quality is changed by suppressing it to a luminance level lower than the still image threshold. [Effects of the Invention]

[0012] According to one aspect of the present disclosure, the risk of image sticking can be reduced. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view of a display device according to a first embodiment of the present disclosure. [Figure 2] 1 is a block diagram showing a configuration of a display device according to a first embodiment. [Figure 3] 4 is a flowchart showing an example of the flow of a display control method performed by the display device according to the first embodiment. [Figure 4] 4 is a diagram showing a state of low brightness control by the display device according to the first embodiment. FIG. [Figure 5] 10 is a flowchart showing an example of the flow of a display control method performed by the display device according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] [Embodiment 1] A display device 1 according to a first embodiment of the present disclosure will be described below with reference to FIGS.

[0015] [Display device configuration] Fig. 1 is a front view of the display device 1. Fig. 2 is a block diagram showing the configuration of the display device 1. As shown in Figs. 1 and 2, the display device 1 includes a receiving unit 10, a sensor 20, an image processing unit 30, a display control unit 40, a display unit 50, and a storage unit 60. The display unit 50 has a screen 51.

[0016] The display device 1 is, for example, a television device. The receiving unit 10 receives a video signal input from outside. The video signal is, for example, an HDR (High Dynamic Range) signal. The HDR signal is, for example, an HDMI (High-Definition Multimedia Interface: registered trademark) signal, a Tuner signal, or a CVBS (Composite Video, Blanking, and Sync) signal. The receiving unit 10 outputs the received video signal to the video processing unit 30.

[0017] The sensor 20 detects environmental information indicating the state of light around the display unit 50. The sensor 20 is disposed, for example, below the display unit 50 of the display device 1. The sensor 20 detects the color temperature around the display unit 50 as an example of the environmental information.

[0018] The video processing unit 30 performs color correction processing, edge processing, noise removal, etc. on the video signal received by the receiving unit 10. After performing various processes on the video signal, the video processing unit 30 outputs a plurality of still images as frames to the display control unit 40.

[0019] The image processing unit 30 has an image quality control unit 31. The image quality control unit 31 controls the image quality of the screen 51 of the display unit 50 based on environmental information about the surroundings of the display unit 50 obtained from the sensor 20. For example, when the sensor 20 detects that the color temperature has changed from cool to warm, the image quality control unit 31 changes the image quality of the screen 51 to warm.

[0020] The image quality control unit 31 controls the image quality of the screen 51. Specifically, the image quality control unit 31 controls the color tone of the screen 51 by adjusting the degree of opening of each pixel of the RGB signals included in the video signal. For example, the image quality control unit 31 changes the color tone to warm colors by increasing the luminance ratio of the R signal relative to the standard image quality of the screen 51, or changes the color tone to cool colors by increasing the luminance ratio of the B signal. The image quality control unit 31 also controls the brightness of the screen 51 by adjusting the gain of the RGB signals to perform gamma control.

[0021] The display control unit 40 displays frames sequentially output from the image processing unit 30 on the display unit 50, thereby displaying an image made up of a plurality of frames, i.e., a moving image, on the display unit 50. The determination unit 41 determines whether a still image or a moving image is being displayed on the screen 51 based on the difference in average luminance between the previous and next frames, and turns on a still image flag stored in the storage unit 60 when it determines that a still image is being displayed on the screen 51.

[0022] The display unit 50 is, for example, an organic EL display. Light-emitting elements including organic light-emitting diodes (OLEDs) are arranged on a screen 51 of the display unit 50. An OLED panel is a self-emitting panel that can emit light by itself and does not require an external light source such as a backlight.

[0023] Although not shown, the display unit 50 is configured to include a substrate, a TFT (Thin Film Transistor) layer formed on the substrate, an organic EL layer formed on the TFT layer, and a cover glass formed on the organic EL layer. The organic EL layer has a plurality of images arranged in a grid pattern. Each pixel includes a red light-emitting element, a green light-emitting element, and a blue light-emitting element. The display control unit 40 controls the light emission of the light-emitting elements of each color based on the RGB signal, thereby displaying an image on the screen 51 in accordance with the video signal.

[0024] The storage unit 60 includes a hard disk drive (HDD), read only memory (ROM), and random access memory (RAM), and stores various programs and data necessary for the operation of the display device 1. The storage unit 60 stores, for example, a still image flag indicating whether a still image is displayed on the screen 51.

[0025] [Display control method flow] Next, the flow of a display control method performed by the display device 1 in the first embodiment will be described with reference to Fig. 3. Fig. 3 is a flowchart showing an example of the flow of a display control method performed by the display device 1.

[0026] 3, first, the receiving unit 10 receives a video signal (S1: receiving step). The receiving unit 10 transmits the received video signal to the video processing unit 30.

[0027] After step S1, the image processor 30 acquires the color temperature of the surroundings of the display device 1 from the sensor 20 at predetermined intervals (S2). The predetermined interval is, for example, 32 ms. Note that steps S1 and S2 may be performed in reverse order or simultaneously.

[0028] After step S2, the image quality control unit 31 receives information as an FB (feedback) signal regarding whether the still image flag stored in the storage unit 60 is on (S3), and determines whether the still image flag is on (S4).

[0029] If the still image flag is off (S4: NO), the image quality control unit 31 determines whether the amount of change in color temperature is equal to or greater than the environmental threshold (S5), and if the amount of change in color temperature is equal to or greater than the environmental threshold (S5: YES), controls the image quality of the screen 51 according to the change in color temperature (S6). The environmental threshold is, for example, a color temperature of 3000 to 4000 [K].

[0030] In step S6, for example, when the sensor 20 detects that the color temperature around the display unit 50 has changed from cool to warm, the image quality control unit 31 changes the image quality of the screen 51 from cool to warm, thereby reducing the visual burden on the viewer of the display device 1.

[0031] If the amount of change in color temperature is less than the environmental threshold value (S5: NO), the image quality control unit 31 proceeds to step S6 without executing step S5.

[0032] On the other hand, if the image quality control unit 31 receives information indicating that the still image flag is on as the FB signal (S4: YES), it proceeds to step S7 as a process that takes the FB signal into consideration, without executing steps S5 and S6. In other words, the image quality control unit 31 does not execute gamma control, color control, etc., when a still image is displayed on the screen 51. For example, the image quality control unit 31 does not change the color from cool to warm, or change the color from warm to cool.

[0033] Next, the determination unit 41 determines whether the image displayed on the screen 51 is a still image or not (S7: determination step). Specifically, the determination unit 41 determines whether a difference α in average picture level (APL) of the image between the (n+1)th frame and the nth frame, where n is a positive integer, is equal to or greater than a still image threshold value β, thereby determining whether a still image or a moving image is being displayed on the screen 51.

[0034] That is, when the difference α in average brightness between frames is equal to or greater than the still image threshold value β, the determination unit 41 determines that a moving image is displayed on the screen 51. On the other hand, when the difference α in average brightness between frames is less than the still image threshold value β, the determination unit 41 determines that a still image is displayed on the screen 51.

[0035] If the judgment unit 41 determines that the image displayed on the screen 51 is a still image (S7: YES), it turns on the still image flag stored in the memory unit 60 (S8) and transmits information that the still image flag is on to the image quality control unit 31 as an FB signal.

[0036] After step S8, the image quality control unit 31 executes low brightness control to lower the brightness than when a moving image is displayed on the screen 51 (S9). Here, Fig. 4 is a diagram showing the low brightness control by the image quality control unit 31 of the display device 1.

[0037] As shown in the lower diagram of Fig. 4, while the image quality control unit 31 is executing low brightness control, the image quality control unit 31 reduces the brightness of the screen 51 compared to the state in which low brightness control is not being executed, as shown in the upper diagram of Fig. 4. This allows a still image with high brightness to be continuously displayed on the screen 51, thereby reducing the risk of burn-in on the screen 51.

[0038] On the other hand, when the determination unit 41 determines that the image displayed on the screen 51 is a moving image (S7: NO), it turns off the still image flag stored in the storage unit 60 (S10).

[0039] After step S9 or step S10, the display control unit 40 displays an image based on the video signal on the screen 51 of the display unit 50 (S11: display step).

[0040] After step S11, the video processing unit 30 determines whether or not the reception of the video signal by the receiving unit 10 has finished (S12). If the reception of the video signal by the receiving unit 10 has not finished (S12: NO), the display device 1 returns to step S1 and repeats steps S1 to S11. On the other hand, if the reception of the video signal by the receiving unit 10 has finished (S12: YES), the display device 1 ends the flow shown in FIG.

[0041] According to the display device 1 of the first embodiment described above, when a still image is displayed on the screen 51 (S4: YES), the image quality control unit 31 does not execute control of the image quality of the screen 51 (S6) based on the detection result of the sensor 20. This prevents the control of the image quality of the screen 51 being executed when a still image is displayed on the screen 51, causing the difference α in average luminance between frames to exceed the still image threshold β, which would lead to the determination unit 41 determining that a moving image is being displayed on the screen 51. Therefore, when a still image is displayed on the screen 51, the low luminance control by the image quality control unit 31 is released, thereby reducing the risk of burn-in on the screen 51.

[0042] In addition, the judgment unit 41 can quickly determine whether a still image or a moving image is being displayed on the screen 51 by determining whether the difference α in average brightness between frames in the image is greater than or equal to the still image threshold β.

[0043] In addition, since organic EL displays using organic light-emitting diodes are more susceptible to burn-in than liquid crystal displays, this technology can further reduce the risk of burn-in.

[0044] [Embodiment 2] Next, a display device 1 according to a second embodiment of the present disclosure will be described with reference to Fig. 5. For ease of explanation, members having the same functions as those described in the first embodiment above will be denoted by the same reference numerals, and the description thereof will not be repeated.

[0045] [Display control method flow] In the second embodiment, the flow of the display control method by the display device 1 differs from that in the first embodiment. Fig. 5 is a flowchart showing an example of the flow of the display control method by the display device 1 in the second embodiment.

[0046] 5, first, the receiving unit 10 receives a video signal (S21: receiving step). After step S21, the video processing unit 30 acquires the color temperature around the display device 1 from the sensor 20 at predetermined time intervals (S22). The predetermined time is, for example, 32 ms.

[0047] After step S22, the image quality control unit 31 receives, as an FB signal, information about whether the still image flag stored in the storage unit 60 is on (S23), and determines whether the still image flag is on (S24).

[0048] If the still image flag stored in the memory unit 60 is off (S24: NO), the image quality control unit 31 determines whether the change in color temperature is greater than or equal to the environmental threshold (S25), and if the change in color temperature is greater than or equal to the environmental threshold (S25: YES), controls the image quality of the screen 51 in accordance with the change in color temperature around the display unit 50, as in step S6 (S26).

[0049] On the other hand, if the still image flag is on (S24: YES), the image quality control unit 31 determines whether the amount of change in color temperature is equal to or greater than the environmental threshold (S27), and if the amount of change in color temperature is equal to or greater than the environmental threshold (S27: YES), as a process taking the FB signal into consideration, the image quality control unit 31 changes the average brightness of the image quality by suppressing the brightness level to a level lower than the still image threshold β (S28).

[0050] In step S28, image quality control unit 31 changes the average luminance of the image over multiple frames while setting the amount of change in average luminance of the image per frame lower than still image threshold value β. This prevents determination unit 41 from determining that a moving image is being displayed on screen 51, even though a still image is being displayed on screen 51, because the amount of change in average luminance per frame exceeds still image threshold value β.

[0051] Next, after step S26, or if the amount of change in color temperature is less than the environmental threshold (S25: NO), or after step S28, or if the amount of change in color temperature is less than the environmental threshold (S27: NO), the image quality control unit 31 proceeds to step S29.

[0052] In step S29 (S29: judgment step), the judgment unit 41 judges whether the image displayed on the screen 51 is a still image or not by determining whether the difference α in average brightness between each frame is equal to or greater than the still image threshold β.

[0053] If the difference α in average brightness between each frame is less than the still image threshold β, the judgment unit 41 determines that the image displayed on the screen 51 is a still image (S29: YES), turns on the still image flag stored in the memory unit 60 (S30), and transmits information that the still image flag is on to the image quality control unit 31 as an FB signal.

[0054] After step S30, the image quality control unit 31 executes low brightness control to make the average brightness of the image lower than when a moving image is displayed on the screen 51 (S31: low brightness control step).

[0055] On the other hand, if the difference α in average brightness between each frame is equal to or greater than the still image threshold β, the judgment unit 41 determines that the image displayed on the screen 51 is a moving image (S29: NO) and turns off the still image flag stored in the memory unit 60 (S32).

[0056] After step S31 or step S32, the display control unit 40 displays an image based on the video signal on the screen 51 of the display unit 50 (S33: display step).

[0057] After step S33, the video processing unit 30 determines whether or not the reception of the video signal by the receiving unit 10 has finished (S34). If the reception of the video signal by the receiving unit 10 has not finished (S34: NO), the display device 1 returns to S21 and repeats steps S21 to S33.

[0058] Then, when the reception of the video signal by the receiving unit 10 is completed (S34: YES), the display device 1 ends the flow shown in FIG.

[0059] According to the display device 1 of the second embodiment described above, when a still image is displayed on the screen 51 (S24: YES), if the amount of change in color temperature is equal to or greater than the environmental threshold (S27: YES), the image quality control unit 31 changes the average luminance of the image quality by suppressing it to a luminance level lower than the still image threshold β (S28).

[0060] This prevents the difference α in average luminance between frames from becoming equal to or greater than the still image threshold β when a still image is displayed on the screen 51, which can lead to the determination unit 41 determining that a moving image is being displayed on the screen 51. Therefore, when a still image is displayed on the screen 51, the low luminance control by the image quality control unit 31 is released, reducing the risk of burn-in on the screen 51.

[0061] Other Embodiments In the display device 1 in the first and second embodiments described above, the sensor 20 detects the color temperature around the display unit 50, but this is not limiting. For example, the sensor 20 may detect the illuminance around the display unit 50. Furthermore, the luminance around the display unit 50 may be detected by converting the detected illuminance into luminance using a well-known conversion formula.

[0062] Furthermore, in the display device 1 in the above-described first and second embodiments, the display unit 50 is an organic EL display using organic light-emitting diodes, but is not limited to this and may also be a display using a CRT (Cathode-Ray Tube).

[0063] [Software implementation example] The functions of the display device 1 (hereinafter referred to as the "device") can be realized by a program that causes a computer to function as the device, and a program that causes a computer to function as each control block of the device (in particular, the video processing unit 30, the image quality control unit 31, the display control unit 40, and the judgment unit 41).

[0064] In this case, the device includes a computer having at least one control device (e.g., a processor) and at least one storage device (e.g., a memory) as hardware for executing the program. The control device and storage device execute the program, thereby realizing the functions described in each of the above embodiments.

[0065] The program may be non-transitory and may be recorded on one or more computer-readable recording media. The recording media may or may not be included in the device. In the latter case, the program may be supplied to the device via any wired or wireless transmission medium.

[0066] In addition, some or all of the functions of each of the control blocks can be realized by logic circuits. For example, integrated circuits in which logic circuits that function as each of the control blocks are formed are also included in the scope of the present disclosure. In addition, the functions of each of the control blocks can also be realized by, for example, a quantum computer.

[0067] Furthermore, each process described in each of the above embodiments may be executed by AI (Artificial Intelligence). In this case, the AI ​​may run on the control device or on another device (for example, an edge computer or a cloud server).

[0068] 〔summary〕 A display device according to a first aspect of the present disclosure includes a receiving unit that receives a video signal, a display unit having a screen that displays a video based on the video signal received by the receiving unit, an image quality control unit that controls the image quality of the screen based on environmental information indicating the state of light around the display unit, and a determination unit that determines whether a video or a still image is to be displayed on the screen. When the determination unit determines that the still image is to be displayed on the screen, the image quality control unit executes low-brightness control to lower the luminance of the screen compared to when the determination unit determines that the video is to be displayed on the screen, and does not execute image quality control based on the environmental information while the low-brightness control is being executed.

[0069] According to the above configuration, when the determination unit determines that a still image is to be displayed on the screen, the image quality of the screen is not controlled. This prevents the determination unit from determining that a moving image is to be displayed on the screen due to a large change in the image quality of the screen caused by the image quality control unit. This reduces the risk of screen burn-in by canceling the low brightness control by the image quality control unit when a still image is displayed on the screen.

[0070] In a display device according to aspect 2 of the present disclosure, in aspect 1 above, the judgment unit may determine whether the video or the still image is being displayed on the screen by determining whether the difference in average brightness between frames in the video is greater than or equal to a still image threshold.

[0071] According to the above configuration, by calculating the difference in average luminance between frames, it is possible to quickly determine whether a still image or a moving image is being displayed on the screen.

[0072] A display device according to a third aspect of the present disclosure includes a receiving unit that receives a video signal, a display unit having a screen that displays a video based on the video signal received by the receiving unit, a picture quality control unit that controls the picture quality of the screen based on acquired environmental information indicating the state of light around the display unit, and a determination unit that determines whether a video or a still image is displayed on the screen by determining whether a difference in average luminance between frames of the video is equal to or greater than a still image threshold. When the determination unit determines that the still image is displayed on the screen, the picture quality control unit executes low-luminance control to lower the average luminance of the video compared to when the determination unit determines that the video is displayed on the screen. During the execution of the low-luminance control, when a change in the environmental information is detected, the image quality control unit changes the average luminance of the image quality by suppressing it to a luminance level lower than the still image threshold.

[0073] According to the above configuration, when the determination unit determines that a still image is displayed on the screen and a change in environmental information is detected, the image quality control unit changes the average luminance of the image quality by suppressing the luminance level below the still image threshold. This prevents the determination unit from determining that a moving image is displayed on the screen due to a change in luminance level above the still image threshold, thereby preventing the image quality control unit from canceling the low luminance control. This reduces the risk of screen burn-in when a still image is displayed on the screen.

[0074] In a display device according to aspect 4 of the present disclosure, in aspect 3 above, when a change in the environmental information is detected while the low brightness control is being performed, the image quality control unit may change the average brightness of the image over multiple frames while lowering the amount of change in the average brightness of the image per frame below the still image threshold.

[0075] According to the above configuration, it is possible to reliably prevent the average brightness of the image displayed on the screen from changing significantly, resulting in the judgment unit determining that a moving image is being displayed on the screen, even though a still image is being displayed on the screen.

[0076] In a display device according to a fifth aspect of the present disclosure, in any one of the first to fourth aspects, light-emitting elements including organic light-emitting diodes may be arranged on the screen of the display unit.

[0077] According to the above configuration, since an organic EL display using an organic light emitting diode is more susceptible to burn-in than a liquid crystal display, the effect of reducing the risk of burn-in can be further achieved.

[0078] A display control method according to a sixth aspect of the present disclosure includes a receiving step of receiving a video signal, a display step of displaying a video based on the video signal received in the receiving step on a screen of a display unit, an image quality control step of controlling the image quality of the screen based on acquisition of environmental information indicating the state of light around the display unit, a determination step of determining whether a video or a still image is to be displayed on the screen in the determination step, and a low brightness control step of lowering the luminance of the screen when it is determined in the determination step that the still image is to be displayed on the screen compared to when it is determined in the determination step that the video is to be displayed on the screen. The image quality control step is not executed while the low brightness control step is being executed.

[0079] According to the above configuration, the same effects as those of the first aspect can be obtained.

[0080] A display control method according to a seventh aspect of the present disclosure includes a receiving step of receiving a video signal, a display step of displaying a video based on the video signal received in the receiving step on a screen of a display unit, an image quality control step of controlling the image quality of the screen based on acquiring environmental information indicating the lighting conditions around the display unit, a determination step of determining whether a video or a still image is to be displayed on the screen by determining whether a difference in average luminance between frames of the video is equal to or greater than a still image threshold, and a low-luminance control step of lowering the average luminance of the video when it is determined in the determination step that the still image is to be displayed on the screen compared to when it is determined in the determination step that the video is to be displayed on the screen. If a change in the environmental information is detected during the low-luminance control step, the average luminance of the image quality is changed by suppressing it to a luminance level lower than the still image threshold.

[0081] According to the above configuration, the same effects as those of the third aspect can be obtained.

[0082] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment. [Explanation of symbols]

[0083] 1 Display device 10 Receiving unit 20 sensors 30 Video Processing Unit 31 Image quality control unit 40 Display control unit 41 Judgment Department 50 Display 51 screens

Claims

1. a receiving unit that receives a video signal; a display unit having a screen for displaying an image based on the image signal received by the receiving unit; an image quality control unit that controls the image quality of the screen based on environmental information that indicates the state of light around the display unit; a determination unit that determines whether a moving image or a still image is to be displayed on the screen; Equipped with The image quality control unit when the determination unit determines that the still image is to be displayed on the screen, executes low-brightness control to lower the luminance of the screen compared to when the determination unit determines that the moving image is to be displayed on the screen; The display device, wherein the image quality control based on the environmental information is not executed while the low brightness control is being executed.

2. The display device according to claim 1, characterized in that the judgment unit determines whether the video or the still image is being displayed on the screen by determining whether the difference in average luminance between frames in the video is greater than or equal to a still image threshold.

3. a receiving unit that receives a video signal; a display unit having a screen for displaying an image based on the image signal received by the receiving unit; an image quality control unit that controls image quality of the screen based on environmental information that indicates a state of light around the display unit; a determination unit that determines whether a difference in average luminance between frames in the video is equal to or greater than a still image threshold value, thereby determining whether a video or a still image is being displayed on the screen; Equipped with The image quality control unit when the determination unit determines that the still image is to be displayed on the screen, executes low brightness control to make the average brightness of the video lower than when the determination unit determines that the moving image is to be displayed on the screen; A display device characterized in that, when a change in the environmental information is detected during execution of the low brightness control, the brightness level is suppressed to a lower level than the still image threshold, and the average brightness of the image quality is changed.

4. The image quality control unit The display device described in claim 3, characterized in that if a change in the environmental information is detected while the low brightness control is being executed, the average brightness of the image is changed over multiple frames while the amount of change in the average brightness of the image per frame is made lower than the still image threshold value.

5. 4. The display device according to claim 1, wherein light-emitting elements including organic light-emitting diodes are arranged on the screen of the display unit.

6. a receiving step of receiving a video signal; a display step of displaying an image based on the image signal received in the receiving step on a screen of a display unit; an image quality control step of controlling image quality of the screen based on acquisition of environmental information indicating a state of light around the display unit; a determining step of determining whether a moving image or a still image is to be displayed on the screen; a low brightness control step of lowering the brightness of the screen when it is determined in the determination step that the still image is to be displayed on the screen compared to when it is determined in the determination step that the moving image is to be displayed on the screen; Including, A display control method, characterized in that the image quality control step is not executed while the low brightness control step is being executed.

7. a receiving step of receiving a video signal; a display step of displaying an image based on the image signal received in the receiving step on a screen of a display unit; an image quality control step of controlling image quality of the screen based on acquisition of environmental information indicating a state of light around the display unit; a determining step of determining whether a difference in average luminance between frames in the video is equal to or greater than a still image threshold value, thereby determining whether a video or a still image is to be displayed on the screen; a low brightness control step of lowering the average brightness of the video when it is determined in the determination step that the still image is to be displayed on the screen, compared to when it is determined in the determination step that the moving image is to be displayed on the screen; Including, A display control method characterized in that, if a change in the environmental information is detected during the execution of the low brightness control step, the average brightness of the image quality is changed by suppressing the brightness level to a lower level than the still image threshold.

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