Display unit and method for controlling display unit

Abstract

To provide a display unit and a method for controlling a display unit that can achieve power saving according to a viewing state of a viewer by changing the light quantity distribution on a screen according to the viewing state.SOLUTION: A display unit (10) comprises: a display (13); an acquisition unit (14) that acquires viewing state information representing a viewing state of a viewer; and a control unit (16). The display has a plurality of light-emitting devices (132) that are arranged on a display area (131) and can control the quantity of light independently of each other. The control unit executes: area setting processing of setting, on the display area, a first area (A1) in which one or more first light-emitting devices (132a) of the plurality of light-emitting devices are arranged, and a second area (A2) in which one or more second light-emitting devices (132b) of the plurality of light-emitting devices are arranged; and extinction processing of reducing the quantity of light of the one or more second light-emitting devices.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a display device and a method for controlling the display device. [Background technology]

[0002] There is a known technology for controlling the operation of an image display device depending on the viewing situation (see Patent Document 1). With this technology, when a captured image does not include the user's face, the amount of light from the backlight of the display panel 102 is reduced, thereby reducing power consumption. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-209739 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology of Patent Document 1 only reduces the amount of light from the backlight, and does not disclose any change in the light amount distribution of the screen being viewed depending on the viewing conditions of the viewer.

[0005] An object of one embodiment of the present invention is to provide a display device and a control method for the display device that can reduce power consumption according to the viewing situation by changing the light distribution of a screen being viewed according to the viewing situation of the viewer. [Means for solving the problem]

[0006] In order to solve the above problems, a display device according to one embodiment of the present invention comprises a display unit that displays an image, an acquisition unit that acquires viewing status information representing a viewer's viewing status, and a control unit that controls a display state on the display unit based on the viewing status information acquired by the acquisition unit, wherein the display unit has a display area and a plurality of light-emitting elements that are arranged on the display area and have light amounts that can be controlled independently of each other, and the control unit performs an area setting process that sets a first area on the display area in which one or more first light-emitting elements of the plurality of light-emitting elements are arranged, and a second area that does not overlap with the first area and in which one or more second light-emitting elements of the plurality of light-emitting elements are arranged, and a dimming process that reduces the light amount of the one or more second light-emitting elements. Effect of the Invention

[0007] According to one embodiment of the present invention, a display device and a control method for a display device can be realized that can achieve power saving according to the viewing situation by changing the light distribution of the screen being viewed in accordance with the viewing situation of the viewer. [Brief description of the drawings]

[0008] [Figure 1] 1 is a block diagram illustrating a configuration of a display device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a flowchart illustrating a process flow in the control method for the display device according to the first embodiment of the present invention. [Diagram 3] FIG. 11 is a diagram illustrating an example of a processing flow in a power saving mode 2. [Figure 4] FIG. 13 is a diagram showing an example of a display state in power saving mode 2. [Diagram 5] FIG. 11 is a flowchart illustrating a process flow in a control method for a display device according to a second embodiment of the present invention. [Figure 6] FIG. 11 is a diagram showing an example of processing in a power saving mode 2a. [Figure 7] FIG. 11 is a diagram showing an example of processing in a power saving mode 2a. [Figure 8] FIG. 13 is a diagram showing an example of a display state in a power saving mode 2a. [Figure 9] 4 is a diagram illustrating an example of a light amount distribution in a first region. FIG. [Figure 10] FIG. 13 is a diagram illustrating an example of an adjusted gamma curve. [Figure 11] FIG. 11 is a diagram showing the determination of a first region based on viewing conditions. [Figure 12] FIG. 11 is a diagram showing a change in the position of a first region. [Figure 13] FIG. 13 is a diagram showing changes in the area of ​​a first region. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [First embodiment] A first embodiment of the present invention will be described in detail below. Fig. 1 is a block diagram showing the configuration of a display device 10 according to the first embodiment. The display device 10 has a video signal processing unit 11, a driver 12, a display unit 13, a viewing condition acquisition unit 14, a storage unit 15, and a control unit 16.

[0010] The display device 10 displays an image based on the video signal ISo on the display unit 13. The display unit 13 is driven by the drive signal DS, and displays the image (for example, a moving image or a still image) represented by the video signal ISo.

[0011] The display unit 13 has a display area 131 and a plurality of light-emitting elements 132(i) arranged on the display area 131 and capable of controlling the amount of light independently of each other. The display unit 13 has a non-emissive display device (e.g., a liquid crystal display device: LCD) or a self-emissive display device (e.g., an organic electroluminescent display device: OLED), and the plurality of light-emitting elements 132(i) function as a light source (backlight) for the non-emissive display device or as (a light-emitting element of) the self-emissive display device. When the display unit 13 is composed of a non-emissive display device, the non-emissive display device forms pixels, and generally, a plurality of pixels are included within the light-emitting range of one light-emitting element 132(i) (e.g., local dimming of a liquid crystal display device). That is, one light-emitting element 132(i) corresponds to a plurality of pixels. On the other hand, when the display unit 13 is composed of a self-emissive display device, the light-emitting element of the self-emissive display device forms pixels, and generally, one light-emitting element 132(i) corresponds to one pixel.

[0012] The video signal processing unit 11 processes the video signal ISi (input video signal) under the control of the control unit 16 or based on the γ curve, and outputs the processed video signal ISo (output video signal) to the driver 12. The driver 12 generates a drive signal DS for driving the display unit 13 based on the processed output video signal ISo.

[0013] The viewing status acquisition unit 14 functions as an acquisition unit that acquires viewing status information that indicates the viewing status of the viewer P. As described later, the viewing status information is used in a switching process that switches the operation mode of the display unit 13 to a normal mode, a power saving mode 1 in which the power consumption of the display unit 13 is smaller than that in the normal mode, and further to a power saving mode 2 and a power saving mode 3.

[0014] The viewing status acquisition unit 14 can use, for example, a sensor (an image sensor or a millimeter wave sensor, for example) that acquires state information of the appearance (e.g., face) of the viewer P. The image sensor can capture an image of the viewer P and acquire an image of the viewer P. The millimeter wave sensor can acquire external shape information of the viewer P by transmitting and receiving electromagnetic waves such as millimeter waves. The viewing status information is, for example, the line of sight and the direction of the face of the viewer P. The control unit 16 can determine, based on the viewing status information, whether the viewer P is in a non-viewing state in which he or she is not watching the video displayed on the display unit 13.

[0015] This non-viewing state means a state in which the viewer P is near the display unit 13 but is not looking at the display unit 13, and is to be distinguished from "absence of viewer P" in which the viewer P is not near the display unit 13 (for example, a state in which the viewer P has moved to another room such as a toilet). The non-viewing state includes a completely non-viewing state in which the viewer P is not looking at the display unit 13 at all (for example, when the viewer P is sleeping in front of the display device 10), as well as a substantially non-viewing state in which the viewer P is not looking at the display unit 13 substantially. The substantially non-viewing state includes a state in which the viewer P occasionally looks at the display unit 13 while doing something else (for example, reading, looking at a smartphone) (so-called multitasking).

[0016] The storage unit 15 can store one or more gamma curves or parameters representing these gamma curves. The storage unit 15 may store only one standard gamma curve, or may store multiple switchable gamma curves.

[0017] The control unit 16 can determine the absence of the viewer P and the non-viewing state based on the viewing status information acquired by the viewing status acquisition unit 14. The control unit 16 can determine the absence of the viewer P and the non-viewing state as follows. When the control unit 16 cannot extract the appearance of the viewer P (for example, face or posture) from the viewing status information, it can determine that the viewer P is absent. The viewer P is generally not absent immediately after the display device 10 is started, but the viewer P may be absent as time passes from the start-up of the display device 10. The control unit 16 extracts the line of sight and the direction of the face of the viewer P from the viewing status information, and can determine that the viewer P is in a non-viewing state when the line of sight or face of the viewer P is not directed toward the display unit 13. For example, when the face of the viewer P is not directed toward the display unit 13 (for example, when the face is facing downwards, or the face cannot be recognized), it can determine that the viewer P is in a non-viewing state. At this time, the control unit 16 may determine the viewer P as being in a non-viewing state (substantially non-viewing state) even when the line of sight or face of the viewer P is temporarily directed toward the display unit 13. "Temporarily" refers to a time when the line of sight or face of the viewer P is continuously directed toward the display unit 13 for less than three seconds, for example.

[0018] The control unit 16 controls the display state of the display unit 13. The control unit 16 can reduce the power consumption of the display unit 13 by reducing the amount of light in the display unit 13. When the display unit 13 is configured from a non-luminous display device, the control unit 16 reduces the amount of light in the display unit 13 by reducing the amount of light from the light-emitting element 132 (backlight). On the other hand, when the display unit 13 is configured from a self-luminous display device, the control unit 16 reduces the amount of light in the display unit 13 by reducing the maximum current of the light-emitting element 132 (corresponding to a pixel of the self-luminous display device). That is, in the case of a self-luminous display device, the change range (maximum light amount, maximum brightness) of the amount of light (brightness) of the light-emitting element 132 is limited. This is because, in the case of a self-luminous display device, the light-emitting element 132 corresponds to a pixel, and therefore the amount of light of each light-emitting element 132(i) is not uniform but differs depending on the image.

[0019] (Display device 10 control method S10) The control method S10 of the display device 10 by the control unit 16 will be described. Fig. 2 is a flow diagram showing the flow of processing in the control method S10 of the display device 10 according to the first embodiment. Fig. 3 is a flow diagram showing the processing contents in the power saving mode 2. Fig. 4 is a diagram showing an image displayed in the power saving mode 2. The control method S10 of the display device 10 will be described in detail below.

[0020] As shown in FIG. 2, the control unit 16 selects the normal mode or the power saving modes 1 to 3 based on the result of the determination that the viewer is not viewing or is not present.

[0021] (1) Normal mode When the control unit 16 starts up the display device 10 and determines that the display device 10 is in a viewing state (not a non-viewing state) ("NO" in step S11, "NO" in step S13), the control unit 16 selects the normal mode (step S17). In the normal mode, the control unit 16 does not reduce the power consumption of the display device 10, particularly the display unit 13, and displays images as usual.

[0022] (2) Power saving mode 1 When the control unit 16 determines that the display unit 13 is in a non-viewing state ("YES" in step S11), the control unit 16 selects power saving mode 1 (step S12). In power saving mode 1, the control unit 16 reduces the power consumption of the display unit 13. As described above, the control unit 16 reduces the amount of light (in the case of a non-luminous display device) or the maximum amount of light (in the case of a self-luminous display device) of the light-emitting element 132(i), thereby reducing the power consumption of the display unit 13. Hereinafter, a reduction in the power consumption or amount of light of the display unit 13 refers to a reduction in the amount of light or the maximum amount of light of the light-emitting element 132(i). Furthermore, unless otherwise specified, a reduction in the amount of light of the light-emitting element 132(i) also includes a reduction in the maximum amount of light of the light-emitting element 132(i).

[0023] In power saving mode 1, control unit 16 reduces the light amount (or the maximum light amount) of light emitting elements 132(i) in display area 131 of display unit 13. That is, the reduction in the light amount is applied to light emitting elements 132(i) in display area 131. Then, an image is displayed in display area 131. That is, in power saving mode 1, an image is displayed on display unit 13 in the same manner as in normal mode, except that the light amount in the entire display area 131 is reduced. Note that, as will be shown later in a fourth embodiment, the gamma curve may be adjusted in accordance with the dimming in the entire display area 131.

[0024] (3) Power saving mode 2 (reduced image) When the non-viewing state continues ("YES" in step S13), the control unit 16 selects the power saving mode 2 (reduced image) (step S14).

[0025] 3 is a diagram showing an example of a processing flow in power saving mode 2. That is, the control unit 16 determines whether the viewer P is in a non-viewing state where he / she is not watching a video, for example, based on the viewing status information, and when the non-viewing state continues for a predetermined time ("YES" in step S13), executes an area setting process S141, a dimming process S142, and a reduced display process S143.

[0026] The region setting process S141 is a process for setting regions A1 and A2 within the display region 131. That is, the control unit 16 sets a first region A1 and a second region A2 that does not overlap with the first region A1 on the display region 131. One or more first light-emitting elements 132a of the multiple light-emitting elements 132(i) are arranged within the first region A1. One or more second light-emitting elements 132b of the multiple light-emitting elements 132(i) are arranged within the second region A1.

[0027] The first area A1 and the second area A2 can be set in various ways. For example, the second area A2 may be disposed so as to surround the first area A1.

[0028] The dimming process S142 is a process for dimming the second region A2. That is, the light amount of the light-emitting elements 132 (one or more second light-emitting elements 132b) in the second region A2 is reduced. Here, considering the continuity with the power saving mode 1, it is preferable to perform the dimming process S142 in the power saving mode 2 as follows. That is, the light-emitting elements 132 (one or more first light-emitting elements 132a) in the first region A1 maintain the dimmed state in the power saving mode 1, and the light-emitting elements 132 (one or more second light-emitting elements 132b) in the second region A2 are set to a state in which the light amount is further reduced from the dimmed state in the power saving mode 1. Note that, in the dimming process S142, the light emission in the second region A2 (one or more second light-emitting elements 132b) may be stopped. That is, dimming (reducing the light amount) may include stopping the light emission. The same applies below.

[0029] The reduced display process S143 is a process for reducing and displaying the image in the first area A1. That is, the control unit 16 reduces the image and displays it in the first area A1. It is preferable that the reduced display process S143 is performed substantially simultaneously with the dimming process S142. "Substantially simultaneously" refers to a time difference (e.g., 34 milliseconds or less) in a range in which the viewer P cannot recognize the dimming process S142 and the reduced display process S143 individually. This is because, if a delay of 1 to 2 frames in a 60 Hz input image is treated as being substantially simultaneous, this time difference can be 34 milliseconds or less (34 [milliseconds] = 17 [milliseconds / frame] * 2 [frames]). Note that this time difference may be delayed more than 34 milliseconds, for example, 68 milliseconds or less.

[0030] Incidentally, for example, in local dimming in liquid crystal display devices and in EL display devices, peak brightness control is sometimes performed to make effective use of power. In this case, it is preferable to stop the peak brightness control when the screen is displayed in a reduced size, as shown below.

[0031] Peak luminance control is a control method in which, when the area of ​​a region (hereinafter referred to as a "black region") whose gradation value (luminance) is below a certain level becomes large, the power normally consumed in this black region is allocated to another region (hereinafter referred to as a "white region"). The peak luminance control makes it possible to realize a bright screen and partially high-luminance display within a predetermined power consumption range, and thus makes effective use of power. However, when the power saving mode 2 (dimming process S142) and the peak luminance control are used in combination, the amount of light in the first region A1 increases in response to the reduction in the amount of light in the second region A2, which may be contrary to power saving. For example, in peak luminance control within a power consumption range of 100 W, it is assumed that 70 W and 30 W of power are consumed by the light emission in the first region A1 and the second region A2, respectively (total of 100 W). In this case, when the second region A2 is turned off to reduce the power consumption by 30 W, the amount of light in the first region A1 is increased by the peak luminance control, and the power consumption may increase by 30 W. As a result, the total power consumption in the first area A1 and the second area A2 is maintained at 100W.

[0032] This also applies to the second embodiment described later. That is, in the power saving mode 2a (dimming processes S142 and S142b) in the second embodiment, it is preferable to stop the peak brightness control from the viewpoint of power saving.

[0033] FIG. 4 is a diagram showing an example of a display state in the power saving mode 2. FIG. 4(a) shows an image displayed in the display area 131 (here, the first area A1) of the display unit 13, and FIG. 4(b) shows the distribution of the amount of light in the display area 131. As shown in FIG. 4(a), the display area 131 of the display unit 13 is divided into a first area A1 and a second area A2, and the second area A2 is arranged so as to surround the first area A1. The second area A2 is dimmed (here, light emission is stopped), and the image is displayed in a reduced size in the first area A1. As shown in FIG. 4(b), the first light emitting element 132a and the second light emitting element 132b are arranged in the first area A1 and the second area A2, respectively. The first light emitting element 132a continues to emit light, and the second light emitting element 132b stops emitting light. FIG. 4 corresponds to the case where the display unit 13 is either a non-luminous display device or a self-luminous display device. That is, the light emitting element 132 may correspond to either a backlight for a non-emissive display device capable of local dimming, or a self-emissive display device.

[0034] The display area 131 may be divided into three or more areas. For example, the display area 131 may have a third area A3 located between the first area A1 and the second area A2. One or more third light-emitting elements 132c among the multiple light-emitting elements 132 are arranged in the third area A3. The light amount in the third area A3 (the light amount of one or more third light-emitting elements 132c) may be between the light amount in the first area A1 (the light amount of one or more first light-emitting elements 132a) and the light amount in the second area A2 (the light amount of one or more second light-emitting elements 132b). That is, an area in which the light amount changes stepwise or continuously may be arranged between the first area A1 and the second area A2.

[0035] In this case, the control unit 16 may reduce and display the image in the area that combines the first area A1 and the third area A3. This display corresponds to a "combination of reduced display and luminance gradient" that will be described later in other embodiments.

[0036] (4) Power saving mode 3 When the control unit 16 detects that the viewer P is not present ("YES" in step S15), it selects the power saving mode 3 (video OFF) (step S16). At this time, the entire display area 131 is dimmed and no video is displayed.

[0037] That is, the control unit 16 detects the absence of the viewer P based on the viewing status information, and when detecting the absence of the viewer P, reduces the amount of light (including stopping light emission) in the first area A1 and the second area A2 (one or more first light-emitting elements 132a and one or more second light-emitting elements 132b). Then, no image is displayed in either the first area A1 or the second area A2.

[0038] As described above, according to the first embodiment, the first area A1 and the second area A2 are set on the display area 131 in accordance with the viewing situation of the viewer P, the image is reduced and displayed in the first area A1, and the second area A2 is dimmed. As a result, by changing the light amount distribution of the screen being viewed in accordance with the viewing situation of the viewer P, it is possible to achieve power saving in accordance with the viewing situation.

[0039] Second Embodiment The second embodiment of the present invention will be described in detail below. The configuration of the display device 10 according to the second embodiment is similar to that of the first embodiment, and therefore a description thereof will be omitted.

[0040] (Display device 10 control method S20) The control method S20 of the display device 10 by the control unit 16 will be described. Fig. 5 is a flow chart showing the flow of processing in the control method S20 of the display device 10 according to the second embodiment. The control method S20 of the display device 10 will be described in detail below.

[0041] In the control method S20, the power saving mode 2a (luminance gradient) is selected instead of the power saving mode 2 (reduced display) (step S14a).

[0042] (1) Dimming due to luminance gradient 1 (dimming in the second area A2: 1-step dimming) 6 is a diagram showing an example of processing in the power saving mode 2a. That is, the control unit 16 determines whether the viewer P is in a non-viewing state where he / she is not watching the video based on the viewing status information, and executes the area setting process S141 and the dimming process S142 when the non-viewing state continues for a predetermined time. Then, the control unit 16 displays the video in the display area 131 without reducing the video (non-reduced display process S144 in the display area 131).

[0043] The dimming process S142 is a process for dimming the second region A2. That is, the light amount of the light-emitting elements 132 (one or more second light-emitting elements 132b) in the second region A2 is reduced. Considering the continuity with the power saving mode 1, it is preferable to perform the dimming process S142 in the power saving mode 2 as follows. That is, the light-emitting elements 132 (one or more second light-emitting elements 132b) in the first region A1 maintain the dimmed state in the power saving mode 1, and the light-emitting elements 132 (one or more second light-emitting elements 132b) in the second region A2 are set to a state in which the light amount is further reduced from the dimmed state in the power saving mode 1. Note that, in the dimming process S142, the light emission in the second region A2 (one or more second light-emitting elements 132b) may be stopped.

[0044] Considering the continuity with the normal mode and the power saving mode 1, it is preferable that the non-reduced display process S144 is performed continuously from the normal mode and the power saving mode 1. That is, for example, the state in which the image is displayed in the display area 131 continues through the normal mode, the power saving mode 1, and the power saving mode 2a, and in the power saving mode 1, both the first area A1 and the second area A2 are dimmed, and in the power saving mode 2a, the second area A2 is further dimmed.

[0045] (2) Dimming due to luminance gradient 2 (dimming in the second area A2 and the third area A3: multi-stage dimming) 7 is a diagram showing an example of processing in the power saving mode 2a. That is, the control unit 16 determines whether the viewer P is in a non-viewing state where he / she is not watching the video based on the viewing status information, and executes the area setting process S141b and the dimming process S142b when the non-viewing state continues for a predetermined time. Then, the control unit 16 displays the video in the display area 131 without reducing the video (non-reduced display process S144 in the display area 131).

[0046] In the region setting process S141b, a first region A1, a second region A2, and a third region A3 are set. That is, in addition to the first region A1 and the second region A2, a third region A3 located between the first region A1 and the second region A2 is set. In the third region A3, one or more third light-emitting elements 132c of the multiple light-emitting elements 132 are arranged.

[0047] In the dimming process S142b, the second region A2 and the third region A3 are dimmed in stages. That is, the light amounts of the first light-emitting element 132a, the second light-emitting element 132b, and the third light-emitting element 132c are decreased in this order. That is, the light amount in the third region A3 (the light amount of the one or more third light-emitting elements 132c) is between the light amount in the first region A1 (the light amount of the one or more first light-emitting elements 132a) and the light amount in the second region A2 (the light amount of the one or more second light-emitting elements 132b).

[0048] Fig. 8 is a diagram showing an example of a display state in power saving mode 2a. Fig. 8(a) shows an image displayed in display area 131 of display unit 13, and Fig. 8(b) shows the distribution of light intensity in display area 131. As shown in Fig. 8(a), an image is displayed in the entire display area 131. As shown in Fig. 8(b), the light intensity in first area A1, second area A2, and third area A3 decreases in this order.

[0049] As described above, according to the second embodiment, the first area A1 and the second area A2 are set on the display area 131 in accordance with the viewing situation of the viewer P, and the second area A2 is dimmed, thereby giving the image a light amount distribution (luminance gradient, luminance slope). As a result, by changing the light amount distribution of the screen being viewed in accordance with the viewing situation of the viewer P, it is possible to achieve power saving in accordance with the viewing situation.

[0050] Third embodiment A display device and a control method for the display device according to a third embodiment of the present invention will be described. In the first and second embodiments, a part of the light-emitting elements 132 in the first area A1 is dimmed to further reduce the power consumption in the display unit 13. For example, when the display unit 13 is configured as a self-luminous display device, the power consumption in the display unit 13 can be further reduced by thinning out the pixels (lighted light-emitting elements 132) that are displayed on the image.

[0051] Fig. 9 is a diagram showing an example of the light amount distribution in the first region A1. Fig. 9 (a) shows a normal case (pixels are not thinned out), (b) (i.e., (b1) and (b2)) shows a case where pixels to be displayed are thinned out and the distribution of the thinned out pixels varies over time, and (c) shows a case where the number of thinned out pixels varies.

[0052] That is, the light emitting element 132a (one or more first light emitting elements 132a) in the first region A1 includes a plurality of first light emitting elements 132a, and the control unit 16 may reduce the light amount of the light emitting element 132 (one or more second light emitting elements 132b) in the second region A2 and reduce the light amount of one or more fourth light emitting elements selected from the plurality of first light emitting elements 132a to be less than the light amount of the other first light emitting elements 132a in the dimming process S142. That is, as shown in (b1) of FIG. 9, among the pixels (corresponding to the light emitting element 132a here) in the first region A1, the pixel P1 is caused to emit light and the pixel P2 is caused to stop emitting light. In this example, the pixel P2 is selected every other pixel both vertically and horizontally from the pixels arranged vertically and horizontally. This arrangement can have various patterns (for example, a staggered arrangement, a hatched arrangement).

[0053] The control unit may change the distribution of one or more fourth light-emitting elements over time. In (b2) of FIG. 9, the pixel P1 that was lit in (b1) is turned off, and the pixel P2 that was turned off in (b1) is turned on. Then, (b1) and (b2) are alternately repeated. In this manner, the distribution of pixels that are turned off among the light-emitting elements 132 in the first region A1 may be changed over time. This averages the accumulated lighting time of the light-emitting elements 132, and for example, image burn-in in an EL display device can be reduced. In an EL display device, the light emission luminance of a pixel tends to decrease according to the accumulated lighting time, and when a specific image is displayed for a long time, a trace of the image may remain on the EL display device (image burn-in).

[0054] 9(c) shows a state where pixel P3 has transitioned from being lit to being unlit, as compared with (b1). That is, the control unit 16 may increase the number of the fourth light-emitting elements, which is one or more, over time. This allows power consumption to be reduced in accordance with non-viewing times.

[0055] As described above, in the third embodiment, by dimming some of the light-emitting elements 132 in the first region A1, power consumption in the display unit 13 can be further reduced. Here, although it has been described that the pixels P and the light-emitting elements 132 correspond one-to-one, the pixels P and the light-emitting elements 132 do not necessarily correspond one-to-one. That is, for example, in local dimming, by dimming some of the multiple first light-emitting elements 132a in the first region A1 more than the other first light-emitting elements 132a or stopping emission, further power saving can be achieved.

[0056] [Fourth embodiment] The fourth embodiment of the present invention will be described in detail below. The configuration of the display device 10 according to the fourth embodiment is similar to that of the first embodiment, and therefore a description thereof will be omitted.

[0057] In this embodiment, in power saving mode 1 (step S12) in the first and second embodiments, the gamma curve is adjusted, and the adjusted gamma curve is used to convert the gradation of the video signal. That is, by adjusting the gamma curve in response to the dimming of the entire display area 131 in power saving mode 1, the sense of discomfort felt by the viewer P due to the dimming of the entire display area 131 is reduced.

[0058] 10 is a diagram showing an example of an adjusted gamma curve. The graph shows a comparison between the gamma curve γa before the adjustment and the gamma curve γb after the adjustment. For example, at an input grayscale level Gi0, the output grayscale level G0b of the gamma curve γb is greater than the output grayscale level G0a of the gamma curve γa.

[0059] When the gradation is expressed by 8 bits (0 to 255), the first reference gradation Gi1 may be, for example, 16 or more and 40 or less, for example, 25, and the second reference gradation Gi2 may be, for example, 180 or more and 210 or less, for example, 200.

[0060] By increasing the output gradation Go in the mid-tone region (for example, between the first reference gradation Gi1 and the second reference gradation Gi2), it is possible to suppress the decrease in luminance in the mid-tone region and reduce the sense of incongruity in the image. In many cases, the gradation range of an image is concentrated in the mid-tone region, and the proportions of the low gradation region and the high gradation region are relatively small. For this reason, in general, by increasing the luminance of the image in the mid-tone region, it is possible to reduce the sense of incongruity in the image when the amount of light is reduced.

[0061] This adjusted gamma curve is preferably also used in power saving mode 2 (step S14) and power saving mode 2a (step S14a). That is, from the viewpoint of continuity with power saving mode 1, in power saving mode 2 and power saving mode 2a, the first region A1 is dimmed from its original state, and in this relationship, the adjusted gamma curve is maintained.

[0062] That is, before the area setting process S141 and the dimming process S142, the control unit 16 executes a process of dimming the entire display area 131 and a process of adjusting a gamma curve for converting the gradation of the video signal IS for display on the display unit 13 from the input gradation Gi to the output gradation Go (step S12: power saving mode 1), and the adjusted gamma curve is maintained even after the area setting process S141 and the dimming process S142 (step S14: power saving mode 2, step S14a: power saving mode 2a).

[0063] Other embodiments The embodiment of the present invention may combine the following elements with the above first to fourth embodiments. That is, the following elements are applicable, for example, to both the case where an image is displayed in a reduced size and the case where a luminance gradient is applied to the image.

[0064] (1) Reduce audio output The display device 10 includes an audio output unit that outputs audio, and the control unit 16 may reduce the amount of light of one or more second light-emitting elements 132b and reduce the audio output output from the audio output unit in the dimming process S142. This reduces the audio output, and the viewer P can recognize that the display device 10 is in the power saving mode without looking at the display unit 13. Here, the audio output may be reduced stepwise in the power saving mode 1, the power saving mode 2 (or the power saving mode 2a), and the power saving mode 3. For example, in the power saving mode 1, the audio output is reduced more than in the normal mode, in the power saving mode 2, the audio output is further reduced, and in the power saving mode 3, the audio output is stopped.

[0065] (2) Setting of the first area A1 The control unit 16 may set the first area A1 based on the viewing situation and the like. FIG. 11 is a diagram showing the setting of the first area A1 based on the viewing situation. The viewer P is located in front of the display unit 13. The first area A1 may be set using parameters including the distance D between the viewer P and the display unit 13 at this time, the angle θh of the viewer P in the horizontal direction with respect to the front direction CL of the display unit 13, the angle θv in the vertical direction, and the line of sight direction LS of the viewer P. Specifically, the position, size, and the like of the first area A1 can be set as shown in the following 2-1 and 2-2. The front direction CL can be defined as a perpendicular line from the center C of the display area 131, for example.

[0066] (2-1) Position of the first area A1 The viewing situation information includes information on the line of sight of the viewer P or the position of the viewer P, and the control unit 16 may determine the position of the first area A1 on the display area 131 based on the line of sight direction or the position of the viewer P in the area setting process S141. By determining the position of the first area A1 according to the line of sight direction or position of the viewer P, it becomes easier to display the reduced image at a position that is easy for the viewer P to view.

[0067] That is, the control unit 16 may determine the reduced display position according to the position of the viewer P relative to the display unit 13. For example, when the viewer P is located on the left side of the display unit 13, the control unit 16 may set the first area A1 to the left of the display area 131. Fig. 12 is a diagram showing a change in the position of the first area. Here, the viewer P is located on the left side of the display unit 13, so that the first area A1 is shifted to the left.

[0068] 12 shows an example of reduced display (first embodiment), but may be applied to a luminance gradient (second embodiment) This also applies to FIG. 13 described later.

[0069] Here, for example, a reduced display screen may be displayed in the area on the side of the position of the viewer P and in the direction in which the viewer is looking. As an example, when the viewer P is located to the left of the display unit 13 and looking to the right, the first area A1 is set to the right within the left area of ​​the display area 131.

[0070] The first area A1 may be set according to the viewing situation in the viewing state before the transition to the non-viewing state. For example, the viewing situation information includes information on the line of sight of the viewer P, and the control unit 16 may set the first area A1 and the second area A2 in the area setting process S141 based on the position on the display area 131 to which the line of sight of the viewer P was directed before the area setting process S141 and the dimming process S142. When the viewer P is in the viewing state, the video can be displayed with the point that the viewer P last focused on as the center. That is, the position of the first area A1 may be determined based on the direction (point of focus) that the viewer P last looked in. For example, if the viewer P was looking at the bottom left of the video, the first area A1 is set at the bottom left of the display area 131.

[0071] An area (important area) in which an important element is displayed may be identified from the displayed image, and the first area A1 may correspond to this area. For example, a person or face may be detected as an object from the image, and an area (important area) in which a face is displayed may be identified.

[0072] For example, an area in which a person who is speaking is displayed in the image of the display area 131 can be set as an important area, that is, the first area A1. As an example, when a reporter is displayed in the lower right of the display area 131, this lower right is set as the first area A1. Also, when a person who appears in a drama is displayed in the lower left of the display area 131, this lower left is set as the first area A1. The first area A1 can be set as the center, the second area A2 can be set around it, and the first area A1 can be left, while the second area A2 around it can be darkened. That is, the area that the viewer P is likely to pay attention to (important image: the first area A1) can be left, and the surrounding area (the second area A2) can be darkened. As a result, the important image is left, and when the viewer P returns his / her gaze to the display area 131, it becomes easy to grasp what kind of image is displayed in the display area 131.

[0073] (2-2) Size (area) of the first region A1 The viewing status information includes information on the distance between the display unit 13 and the viewer P, and the control unit 16 may set the first area A1 and the second area A2 in the area setting process S141 such that as the distance increases, the area of ​​the first area A1 decreases and the area of ​​the second area A2 increases. The distance from the viewer P can be considered as a parameter representing the viewer P's interest in the video. The area of ​​the first area A1 can be changed according to the viewer P's interest to save power. FIG. 13 is a diagram showing the change in the area of ​​the first area A1. Here, the area of ​​the first area A1 is smaller than in FIG. 11 and FIG. 12.

[0074] (3) Adjusting the amount of light The viewing status information includes information on the distance between the display unit 13 and the viewer P, and the control unit 16 may reduce the light intensity of one or more second light-emitting elements 132b and reduce the light intensity of one or more first light-emitting elements 132a in the dimming process S142 so that the light intensity decreases as the distance increases. The distance to the viewer P can be considered as a parameter representing the viewer P's interest in the video. The light intensity can be changed according to the viewer P's interest to save power.

[0075] (4) Control over time The control unit 16 may reduce the area of ​​the first region A1 and increase the area of ​​the second region A2 according to the time that has passed since the dimming process S142 was started. The display area can be reduced according to the time that has passed since the power saving mode was started (elapsed time) to save power. When the elapsed time exceeds a predetermined threshold, for example, the area of ​​the first region A1 may be set to zero and the display of the image itself may be stopped.

[0076] The control unit 16 may reduce the light amount of one or more first light-emitting elements 132a according to the time that has elapsed since the dimming process S142 was started. By reducing the light amount according to the elapsed time, further power saving can be achieved. Furthermore, the control unit 16 may reduce the light amount of one or more first light-emitting elements 132a and reduce the area of ​​the first region A1 according to the time that has elapsed since the dimming process S142 was started. That is, power saving can be achieved by combining the reduction in the area of ​​the first region A1 and the reduction in luminance (light amount of the first light-emitting element 132a).

[0077] (5) Combination of reduced display and luminance gradient A reduced display and a luminance gradient may be combined. That is, when an image is reduced and displayed in the first area A1, for example, a third area A3 is further set near the outer periphery of the first area A1, and the third area A3 is dimmed. At this time, the remaining first area A1S, third area A3, and second area A2 are dimmed in order. For example, the light emission in the second area A2 is stopped, and the third area A3 is weakly lit, and an image is displayed in the original first area A1 (the third area A3 and the remaining first area A1S). In this way, the light emission in the first area A1 can be further reduced to save power.

[0078] (6) Reference viewer P0 when there are multiple viewers P The number of viewers P is not limited to one, and there may be multiple viewers P. In this case, it is preferable to determine a reference viewer P0 as shown below, and determine the position, area, light intensity, etc. of the first region A1 based on the line of sight, facial direction, position, distance, etc. of this reference viewer P0.

[0079] When any of the multiple viewers P is looking at the display unit 13, the control unit 16 determines that the viewer is in a viewing state, and when none of the multiple viewers P is looking at the display unit 13, the control unit 16 determines that the viewer is in a non-viewing state. When the control unit 16 determines that the viewer is in a non-viewing state, in principle, the control unit 16 sets the viewer P who watched the display unit 13 to the end (last viewer) as the reference viewer P0 and applies the above-mentioned processes (1) to (5). However, instead of the last viewer, the viewer P who has been in a viewing state for the longest cumulative time (longest viewer) or the viewer P who is closest to the display unit 13 (closest viewer) may be set as the reference viewer.

[0080] [Software implementation example] The functions of the display device 10 (hereinafter referred to as the "device") can be realized by a program for causing a computer to function as the device, and a program for causing a computer to function as each control block of the device (in particular, the control unit 16).

[0081] 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 to realize each function described in each of the above embodiments.

[0082] The program may be non-transitory and may be recorded in 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 provided to the device via any wired or wireless transmission medium.

[0083] In addition, some or all of the functions of each of the control blocks can be realized by a logic circuit. For example, an integrated circuit in which a logic circuit that functions as each of the control blocks is formed is also included in the scope of the present invention. In addition, the functions of each of the control blocks can be realized by, for example, a quantum computer.

[0084] 〔summary〕 A display device according to aspect 1 of the present invention comprises a display unit that displays an image, an acquisition unit that acquires viewing status information representing a viewer's viewing status, and a control unit that controls the display state on the display unit based on the viewing status information acquired by the acquisition unit, wherein the display unit has a display area and a plurality of light-emitting elements arranged on the display area and capable of controlling the amount of light independently of each other, and the control unit performs an area setting process that sets a first area on the display area in which one or more first light-emitting elements of the plurality of light-emitting elements are arranged, and a second area that does not overlap with the first area and in which one or more second light-emitting elements of the plurality of light-emitting elements are arranged, and a dimming process that reduces the amount of light of the one or more second light-emitting elements.

[0085] In this way, a first area A1 and a second area A2 are set on the display area 131, and the second area A2 is dimmed according to the viewing conditions of the viewer. As a result, by changing the light distribution of the screen being viewed according to the viewing conditions of the viewer, it is possible to achieve power saving according to the viewing conditions.

[0086] In the display device according to aspect 2 of the present invention, in addition to aspect 1, the control unit reduces the image and displays it in the first area. This reduces the image and displays it in the first area, thereby achieving power saving according to viewing conditions.

[0087] A display device according to a third aspect of the present invention is the display device of the first aspect, wherein the control unit displays the image in the display area without reducing the image, thereby brightening a part of the image corresponding to the first area, thereby achieving power saving according to the viewing situation.

[0088] A display device according to an aspect 4 of the present invention is any of the aspects 1 to 3, in which the control unit determines whether the viewer is in a non-viewing state where the viewer is not watching a video based on the viewing status information, and executes the area setting process and the dimming process when the non-viewing state continues for a predetermined time. By executing the area setting process and the dimming process when the non-viewing state continues for the predetermined time, it is possible to achieve power saving according to the viewing status.

[0089] A display device according to a fifth aspect of the present invention is any of the first to fourth aspects, wherein the control unit detects the absence of the viewer based on the viewing status information, and reduces the light intensity of the one or more first light-emitting elements and the one or more second light-emitting elements when detecting the absence of the viewer. By reducing the light intensity of the one or more first light-emitting elements and the one or more second light-emitting elements when detecting the absence of the viewer, further power saving is achieved.

[0090] A display device according to a sixth aspect of the present invention is any one of the first to fifth aspects, the display device further comprising an audio output unit that outputs audio, and the control unit reduces the amount of light of the one or more second light-emitting elements and reduces the audio output from the audio output unit in the dimming process, thereby allowing a viewer to determine that the display device has switched to the power saving mode by the audio.

[0091] A display device according to a seventh aspect of the present invention is any one of the first to sixth aspects, wherein the second area surrounds the first area. By disposing a relatively dark second area around a relatively bright first area, it is possible to achieve power saving according to viewing conditions.

[0092] A display device according to an eighth aspect of the present invention is any one of the first to seventh aspects, wherein the display region has a third region located between the first region and the second region, in which one or more third light-emitting elements of the plurality of light-emitting elements are arranged, and the light amount of the one or more third light-emitting elements is between the light amount of the one or more first light-emitting elements and the light amount of the one or more second light-emitting elements. By arranging the third region of intermediate brightness between the first region and the second region, the boundary between the first region and the second region can be made inconspicuous.

[0093] A display device according to a ninth aspect of the present invention is any of the first to eighth aspects, wherein the viewing situation information includes information on the viewer's line of sight or the viewer's position, and the control unit determines the position of the first area on the display area based on the line of sight or the viewer's position in the area setting process. By determining the position of the first area based on the viewer's line of sight or the viewer's position, it becomes easier for the viewer to view the video.

[0094] A display device according to aspect 10 of the present invention is any of aspects 1 to 9, wherein the viewing status information includes information on a distance between the display unit and the viewer, and the control unit, in the area setting process, sets the first area and the second area such that the area of ​​the first area becomes smaller and the area of ​​the second area becomes larger as the distance increases. By making the area of ​​the first area smaller and the area of ​​the second area larger as the distance increases, it is possible to conserve power in accordance with the level of interest of the viewer.

[0095] A display device according to an eleventh aspect of the present invention is any of the first to tenth aspects, wherein the viewing situation information includes information on the line of sight of the viewer, and the control unit, in the area setting process, sets the first area and the second area based on a position on the display area to which the line of sight of the viewer is directed prior to the area setting process and the dimming process. By setting the first area based on the line of sight of the viewer, it is possible to make the video easier for the viewer to view.

[0096] A display device according to a twelfth aspect of the present invention is any one of aspects 1 to 11, wherein the viewing status information includes information on a distance between the display unit and the viewer, and the control unit, in the dimming process, reduces the light intensity of the one or more second light-emitting elements and reduces the light intensity of the one or more first light-emitting elements such that the light intensity decreases as the distance increases. By increasing or decreasing the light intensity based on the distance to the viewer, it is possible to achieve power saving in accordance with the level of interest of the viewer.

[0097] A display device according to Aspect 13 of the present invention is any of Aspects 1 to 12, wherein the control unit reduces an area of ​​the first region and increases an area of ​​the second region in accordance with the time that has elapsed since the dimming process was started. By reducing the area of ​​the first region in accordance with the elapsed time, power saving can be achieved.

[0098] A display device according to a fourteenth aspect of the present invention is any one of aspects 1 to thirteen, wherein the control unit reduces the light amount of the one or more first light-emitting elements according to the time that has elapsed since the dimming process was started. By reducing the light amount of the first light-emitting elements according to the elapsed time, it is possible to save power.

[0099] A display device according to a fifteenth aspect of the present invention is any one of aspects 1 to 14, wherein the one or more first light-emitting elements include a plurality of first light-emitting elements, and the control unit, in the dimming process, reduces the light amount of the one or more second light-emitting elements and reduces the light amount of one or more fourth light-emitting elements selected from the plurality of first light-emitting elements to be less than the light amount of the other first light-emitting elements. By thinning out the pixels displayed in the first region, power saving can be achieved.

[0100] A display device according to a sixteenth aspect of the present invention is the same as that of the fifteenth aspect, wherein the control unit changes the distribution of the one or more fourth light-emitting elements over time. By changing the distribution of the fourth light-emitting elements over time, burn-in in the EL display device can be reduced.

[0101] A display device according to Aspect 17 of the present invention is any of Aspects 15 and 16, wherein the control unit increases the number of the one or more fourth light-emitting elements over time. By increasing the number of the fourth light-emitting elements over time, power saving can be achieved.

[0102] A display device according to an eighteenth aspect of the present invention is any one of aspects 1 to 17, in which the control unit executes, before the region setting process and the dimming process, a process of dimming the entire display region and a process of adjusting a gamma curve for converting the gradation of a video signal for display on the display unit from an input gradation to an output gradation, and the adjusted gamma curve is maintained even after the region setting process and the dimming process. When the first region is dimmed by dimming the entire display region and this state continues, by maintaining the adjusted gamma curve, it is possible to suppress a decrease in the visibility of the image.

[0103] A display device according to a nineteenth aspect of the present invention is any one of aspects one to eighteen, wherein the display unit has a non-luminous display device or a self-luminous display device, and the light-emitting elements function as a light source for the non-luminous display device or as the self-luminous display device. Whether the display unit is composed of a non-luminous display device or a self-luminous display device, power saving can be achieved by reducing the amount of light.

[0104] A control method for a display device according to aspect 20 of the present invention is a control method for a display device having a display unit for displaying an image, the display unit having a display area and a plurality of light-emitting elements arranged on the display area and capable of controlling the amount of light independently of each other, and the control method includes an acquisition process for acquiring viewing situation information representing a viewer's viewing situation, a region setting process for setting, based on the viewing situation information, a first region on the display area in which one or more first light-emitting elements of the plurality of light-emitting elements are arranged, and a second region which does not overlap with the first region and in which one or more second light-emitting elements of the plurality of light-emitting elements are arranged, and a dimming process for reducing the amount of light of the one or more second light-emitting elements.

[0105] In this way, a first area A1 and a second area A2 are set on the display area 131, and the second area A2 is dimmed according to the viewing conditions of the viewer. As a result, by changing the light distribution of the screen being viewed according to the viewing conditions of the viewer, it is possible to achieve power saving according to the viewing conditions.

[0106] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Furthermore, new technical features can be formed by combining the technical means disclosed in the respective embodiments. [Explanation of symbols]

[0107] 10 Display device 11 Video signal processing section 12 Drivers 13 Display section 14 Viewing status acquisition unit 15 Storage section 16 Control section 131 Display area 132 Light emitting element A1 1st area A2 2nd area A3 Third area

Claims

1. A display unit for displaying an image; An acquisition unit that acquires viewing situation information representing a viewing situation of a viewer; a control unit that controls a display state of the display unit based on the viewing situation information acquired by the acquisition unit, the display unit has a display area and a plurality of light-emitting elements arranged on the display area and capable of controlling the amount of light independently of each other; The control unit is a region setting process for setting, on the display region, a first region in which one or more first light-emitting elements of the plurality of light-emitting elements are arranged, and a second region that does not overlap with the first region and in which one or more second light-emitting elements of the plurality of light-emitting elements are arranged; a dimming process for reducing the amount of light of the one or more second light-emitting elements; A display device that performs the above.

2. The display device according to claim 1 , wherein the control unit reduces the image and displays it in the first area.

3. The display device according to claim 1 , wherein the control unit causes the image to be displayed in the display area without being reduced.

4. The control unit is determining whether the viewer is in a non-viewing state where the viewer is not viewing a video based on the viewing status information; 4. The display device according to claim 1, wherein the area setting process and the dimming process are executed when the non-viewing state continues for a predetermined time.

5. The control unit is Detecting the absence of the viewer based on the viewing situation information; The display device according to claim 1 , wherein when the absence of the viewer is detected, the light amount of the one or more first light-emitting elements and the one or more second light-emitting elements is reduced.

6. The display device includes an audio output unit that outputs audio, The control unit, in the dimming process, reducing the amount of light emitted by the one or more second light-emitting elements; and The display device according to claim 1 , wherein an audio output output from the audio output section is reduced.

7. 4. The display device according to claim 1, wherein the second region surrounds the first region.

8. the display region has a third region located between the first region and the second region, in which one or more third light-emitting elements of the plurality of light-emitting elements are arranged; A display device described in any one of claims 1 to 3, wherein the light amount of the one or more third light-emitting elements is between the light amount of the one or more first light-emitting elements and the light amount of the one or more second light-emitting elements.

9. The viewing situation information includes information on the viewer's line of sight or the viewer's position, The control unit, in the area setting process, 4. The display device according to claim 1, further comprising: a display unit configured to determine a position of the first area on the display area based on the line of sight or a position of the viewer.

10. the viewing situation information includes information about a distance between the display unit and the viewer, The control unit, in the area setting process, A display device as described in any one of claims 1 to 3, wherein the first region and the second region are set so that as the distance increases, the area of ​​the first region becomes smaller and the area of ​​the second region becomes larger.

11. The viewing situation information includes information on the viewer's line of sight, The control unit, in the area setting process, A display device as described in any one of claims 1 to 3, wherein the first area and the second area are set based on a position on the display area to which the viewer's line of sight is directed prior to the area setting process and the dimming process.

12. the viewing situation information includes information about a distance between the display unit and the viewer, The control unit, in the dimming process, reducing the amount of light emitted by the one or more second light-emitting elements; and 4. The display device according to claim 1, wherein an amount of light emitted from the one or more first light-emitting elements is reduced such that the amount of light decreases as the distance increases.

13. The control unit is 4. The display device according to claim 1, wherein the area of ​​the first region is reduced and the area of ​​the second region is increased depending on the time that has elapsed since the dimming process was started.

14. The control unit is The display device according to claim 13 , wherein the light amount of the one or more first light-emitting elements is reduced in accordance with the time that has elapsed since the dimming process was started.

15. The one or more first light emitting elements include a plurality of first light emitting elements, The control unit, in the dimming process, reducing the amount of light emitted by the one or more second light-emitting elements; and The display device according to any one of claims 1 to 3, wherein the light amount of one or more fourth light-emitting elements selected from the plurality of first light-emitting elements is reduced compared to the light amount of the other first light-emitting elements.

16. The control unit is The display device according to claim 15 , wherein a distribution of the one or more fourth light-emitting elements is changed over time.

17. The control unit is The display device according to claim 15 , wherein a number of the one or more fourth light-emitting elements is increased over time.

18. The control unit, before the area setting process and the dimming process, Dimming the entire display area; A process of adjusting a gamma curve for converting the gradation of a video signal for display on the display unit from an input gradation to an output gradation; 4. The display device according to claim 1, wherein the adjusted gamma curve is maintained even after the area setting process and the dimming process.

19. The display unit includes a non-emissive display device or a self-emissive display device, The plurality of light-emitting elements function as a light source for the non-emissive display device or as the self-emissive display device. The display device according to any one of claims 1 to 3.

20. A method for controlling a display device having a display unit that displays an image, comprising: the display unit has a display area and a plurality of light-emitting elements arranged on the display area and capable of controlling the amount of light independently of each other; The control method includes: An acquisition process for acquiring viewing situation information representing a viewing situation of a viewer; a region setting process for setting, on the display region, a first region in which one or more first light-emitting elements of the plurality of light-emitting elements are arranged, and a second region that does not overlap with the first region and in which one or more second light-emitting elements of the plurality of light-emitting elements are arranged, based on the viewing situation information; a dimming process for reducing the amount of light of the one or more second light-emitting elements; A control method comprising:

Images