阅读说明：本技术 显示装置、显示方法、以及显示控制程序 (Display device, display method, and display control program ) 是由 北城直大 于 2018-12-28 设计创作，主要内容包括：使显示影像时的,影像本来的亮度的再现性提升。显示装置(1)包括：耗电控制部(24),计算背光(13)的总耗电；显示模式管理部(22),基于最大显示亮度(L2)、与预先订定的设定显示亮度(L1)的关系,决定影像的缩小比例或切割比例；以及显示控制部(23),按照缩小比例或切割比例,进行对于已被输入的影像的处理。(The reproducibility of the original brightness of a video is improved when the video is displayed. A display device (1) is provided with: a power consumption control unit (24) that calculates the total power consumption of the backlight (13); a display mode management unit (22) for determining the reduction ratio or the division ratio of the image on the basis of the relationship between the maximum display luminance (L2) and a predetermined set display luminance (L1); and a display control unit (23) that performs processing on the image that has been input, in accordance with the reduction ratio or the cut ratio.)

1. A display device, comprising:

a power consumption calculation unit that calculates the total power consumption of the plurality of light sources when the input image is displayed;

a scale determination unit that determines a reduction scale or a division scale of the image based on a relationship between a predetermined maximum display luminance of an arbitrary pixel, which is displayable in a predetermined manner, and a set display luminance that is a maximum value of display luminance for performing faithful luminance display, which is set in advance, in the total power consumption calculated by the power consumption calculation unit; and

and a display control unit that performs processing on the video in accordance with the reduction ratio or the cutting ratio determined by the ratio determination unit.

2. The display device according to claim 1, comprising:

a display unit that displays the image; wherein

The ratio determination unit generates (i) a display ratio that is a ratio of the size of a display area displayed on the display unit to the size of the video, or a display ratio that is a ratio of the size of a cutout area cut out from the video to the size of the video displayed on the display unit, and (ii) power consumption data that indicates a relationship based on a relative value of the total power consumption corresponding to the display ratio;

the power consumption data is compared with a luminance ratio, which is a ratio of the predetermined maximum display luminance to the set display luminance, to determine a reduction ratio or a division ratio of the image.

3. The display device according to claim 2,

the ratio determination unit determines the display ratio based on the total power consumption relative value being equal to or less than the luminance ratio as a range in which a reduction ratio or a cut-out ratio of the image can be set in the power consumption data.

4. A display device as claimed in claim 2 or 3,

setting other image display brightness for displaying the other image so that the other image different from the image displayed at the reduced scale or the cut scale can be displayed when the image is displayed at the reduced scale or the cut scale determined by the scale determination unit;

the ratio determination unit uses, as the luminance ratio, a ratio obtained by subtracting the other display luminance from the predetermined maximum display luminance with respect to the set display luminance.

5. The display device according to any one of claims 1 to 3,

the display control unit performs processing on the video so that the video divided at the division ratio determined by the ratio determination unit is displayed in an enlarged manner when there is a margin for the total power consumption.

6. The display device according to any one of claims 1 to 5, comprising:

a display unit that displays the image; wherein

The display section includes: a liquid crystal panel, and a backlight including the plurality of light sources, the luminance of which can be independently adjusted for each of the regions divided into a plurality of regions.

7. The display device according to any one of claims 1 to 5, comprising:

a display unit that displays the image; wherein

The display section is a display panel including a plurality of self-light emitting elements;

the plurality of self-light emitting elements are the plurality of light sources.

8. A display method, comprising:

a power consumption calculation step of calculating total power consumption of the plurality of light sources when the input image is displayed;

a scale determining step of determining a reduction scale or a cut scale of the image based on a relationship between a predetermined maximum display luminance of an arbitrary pixel, which is displayable in advance, and a set display luminance which is a maximum value of display luminance for performing faithful luminance display, which is set in advance, in the total power consumption calculated in the power consumption calculating step; and

and a display control step of performing processing on the image in accordance with the reduction ratio or the division ratio determined in the ratio determination step.

9. A display control program for causing a computer to function as the display device according to any one of claims 1 to 7,

the display control unit is configured to cause a computer to function as the power consumption calculation unit, the ratio determination unit, and the display control unit.

Technical Field

The present disclosure relates to a display device for displaying images.

Background

In recent years, better quality reproduction or realistic reproduction is required, and standardization of playback using HDR (High-dynamic-range) is in progress. In ITU-R BT.2100, HLG (Hybrid Log-Gamma) and PQ (Perceptial quantization) are defined in two ways. Even in either mode, the dynamic range of the television standard far exceeding that of the conventional one is characterized.

In the HDR video, the upper limit luminance of white is allowed to 10000nits for the purpose of sufficiently reproducing the luminance of the real world (natural environment). However, the upper limit luminance (display peak luminance) defined based on the display performance limit of a display device for displaying an HDR image is generally about 1000nits although 4000nits is achieved in some display devices. Therefore, it is necessary to perform content creation including HDR images or HDR image display as is displayable with the display device.

Generally, tone mapping (tone mapping) processing including knee curve processing (knee curve processing) is performed on an HDR image so as to be received in the maximum display luminance of a display device. However, if the knee processing is performed independently for each color of RGB, there is a problem of color change of the HDR image.

Therefore, in the technique of patent document 1, a part of the PQ curve is converted into a gamma curve (gamma curve) under the following conditions. That is, the value of MaxCLL (e.g., 800nits) in the HDR image is adjusted to the maximum display luminance (e.g., 750nits) of the display device, and the relative relationship between the luminances of the PQ curve (a part of the PQ curve) in the luminance range of 0 to 800nits is changed without changing. Also, maxcll (the Maximum Content light level) is information indicating the Maximum display luminance of a title (title) or a scene (scene) included in the HDR video.

Disclosure of Invention

Technical problem to be solved by the invention

However, the technique of patent document 1 has a problem that reproducibility of display luminance in a low luminance region and a medium luminance region is lowered.

Further, the maximum display luminance that can be displayed by the display device may vary depending on conditions such as the average luminance level of the HDR image. For example, depending on the display conditions, the maximum display luminance when the HDR image is actually displayed may be 1/5 or less of the preset display peak luminance of the display device. Therefore, it is difficult to reproduce the luminance desired by the photographer or the creator when capturing or creating the HDR image when displaying the image.

An aspect of the present disclosure is to improve reproducibility of original brightness of a video when the video is displayed.

Means for solving the problems

In order to solve the above problem, a display device according to an aspect of the present disclosure includes: a power consumption calculation unit that calculates the total power consumption of the plurality of light sources when the input image is displayed; a scale determination unit that determines a reduction scale or a division scale of the image based on a relationship between a predetermined maximum display luminance of an arbitrary pixel, which is displayable in a predetermined manner, and a set display luminance that is a maximum value of display luminance for performing faithful luminance display, which is set in advance, in the total power consumption calculated by the power consumption calculation unit; and a display control unit that performs processing on the video in accordance with the reduction ratio or the cutting ratio determined by the ratio determination unit.

In order to solve the above problem, a display method according to an aspect of the present disclosure includes: a power consumption calculation step of calculating total power consumption of the plurality of light sources when the input image is displayed; a scale determining step of determining a reduction scale or a division scale of the image based on a relationship between a predetermined maximum display luminance of an arbitrary pixel, which is displayable in advance, and a set display luminance which is a maximum value of display luminance of an arbitrary pixel, which is displayed with faithful luminance and which has been set in advance, in the total power consumption calculated in the power consumption calculating step; and a display control step of performing processing on the image in accordance with the reduction ratio or the division ratio determined in the ratio determination step.

Effects of the invention

According to an aspect of the present disclosure, it is possible to improve the reproducibility of the original brightness of a video when the video is displayed.

Drawings

Fig. 1 is a block diagram showing an example of the configuration of a display device according to embodiment 1.

Fig. 2 is a diagram illustrating a reduction ratio and a cut ratio, where (a) is a diagram showing an example of a reduced image, and (b) is a diagram showing an example of a cut image.

Fig. 3 is a diagram showing a relationship between total power consumption of the backlight and maximum display luminance of the display device in accordance with embodiment 1.

Fig. 4 is a diagram showing an example of power consumption data calculated based on an inputted video signal.

Fig. 5 is a flowchart showing an example of processing of the display device.

Fig. 6 is a diagram showing a relationship between total power consumption of the backlight and maximum display luminance of the display device in embodiment 2.

Fig. 7 is a diagram showing an example of a display screen according to embodiment 2, where (a) is an example of a display screen on which multi-image display is performed that is realized when a reduced image is displayed, and (b) is an example of a display screen on which multi-image display is performed that is realized when a cut image is displayed.

Fig. 8 is a diagram showing an example of power consumption data calculated based on an input video signal in the display device according to embodiment 3.

Fig. 9 is a diagram for explaining an enlarged display of a cut region of the display device according to embodiment 3.

Fig. 10 is a diagram for explaining an enlarged display of a cut region of a display device according to a modification of embodiment 3.

Fig. 11 is a block diagram showing an example of the configuration of the display device according to embodiment 4.

Detailed Description

[ embodiment 1]

Hereinafter, an embodiment of the present disclosure will be described in detail.

< construction of display device >

Fig. 1 is a block diagram showing an example of the configuration of a display device 1 according to the present embodiment. As shown in fig. 1, the display device 1 includes a video signal processing unit 11, a display panel 12 (display unit), a backlight 13 (display unit), and an operation unit 14.

The video signal processing unit 11 performs various processes on the video signal input to the display device 1. In the present embodiment, the video signal processing unit 11 has a so-called Local dimming (Local dimming) function of independently controlling the lighting of a plurality of light sources constituting the backlight 13 to display a video on the display panel 12. In a display device having a local dimming function, the lighting states of a plurality of light sources change according to a displayed image, and thus power consumption changes according to the displayed image. In addition, similarly to a display device using a self-Light Emitting element such as an OLED (Organic Light Emitting Diode) display, power consumption changes according to a displayed image. The OLED will be described in detail in embodiment 4 described later.

The video signal is a video signal for displaying an HDR video conforming to the HDR standard. The video signal (video content) is input to the display device 1 as a television broadcast or through various packaging media (package media) or a network. The image signal may be a moving image or a still image.

The display panel 12 displays an image displayed on the video signal (corrected video signal) processed by the video signal processing unit 11. In the present embodiment, the display panel 12 is a liquid crystal panel.

The backlight 13 is a light source including a light emitting surface that emits light. The light emitting surface of the backlight 13 is divided into a plurality of regions, and the luminance can be adjusted independently for each region. The backlight 13 adjusts the luminance of each region based on the luminance data from the video signal processing unit 11.

The operation unit 14 accepts an input based on a user operation. In the present embodiment, the operation unit 14 receives an input of a value of the set display luminance, which is set in advance by the user and indicates the maximum value of the display luminance for performing faithful luminance display.

The set display luminance is set by the user as a limit value of the display luminance at which the image displayed by the input video signal can be accurately displayed in the display device 1. The correct display is to directly display the luminance value of the photographic subject such as a camera. That is, the accurate display means that the displayed video is displayed with the highest reproducibility possible with respect to the video that has been input. Specifically, the accurate display means that the image is displayed with brightness that is faithful to the brightness value of the image that has been input (for example, brightness equal to the brightness value of the image that has been input).

For example, in the case where the display device 1 performs the display by the PQ method, if the pixel value (for example, the gradation value or the luminance value) of a pixel of an image that has been input is equal to or less than the set display luminance, the pixel value uniquely corresponds to the absolute value of the luminance when the pixel is displayed on the display device 1. Therefore, in the PQ method, a faithful luminance display is displayed at a display luminance corresponding to the pixel value of the pixel of the image that has been input.

For example, in the case where the display device 1 performs the display by the above-described HLG method, when the pixel value of the pixel of the image to be input is equal to or less than the set display luminance, the pixel value is in a relative relationship with the absolute value of the luminance at the time of displaying the pixel by the display device 1. Therefore, for example, the display luminance when the pixel value of the pixel of the image that has been input is the maximum value of the pixel values of the image is determined so as to match the display peak luminance of the display device 1, and the relationship between the pixel value of the pixel of the image that has been input and the absolute value of the luminance when the pixel is displayed on the display device is determined. Therefore, in the HLG system, faithful luminance display is displayed at the display luminance thus determined.

Further strictly, in both methods, faithful luminance display is performed at a constant display luminance without changing depending on the image content. For example, in a display device as a comparative example to be described later, the display luminance varies depending on the image content.

As the set display luminance, a luminance value as close as possible to the display peak of the display device 1 is set, whereby display can be performed close to the display peak luminance and also close to the luminance value of the video signal.

The maximum display luminance is a display luminance determined based on the total power consumption when the image that has been input is actually displayed. On the other hand, the display peak luminance is the upper limit luminance of the display device 1 predetermined in accordance with the specification of the display device 1, and is achieved only under a good condition that an image such as the total power consumption is equal to or less than a predetermined value can be displayed. That is, the maximum value of the maximum display luminance is the display peak luminance.

It is sufficient that the display luminance is set in advance before the processing of the video signal by the video signal processing unit 11. The user is not limited to the person who views the video displayed on the display device 1, and may include, for example, a sender of the video signal (e.g., a producer of the video content) or a manufacturer of the display device 1. That is, if the display luminance is set as described above, the setting person is not particularly limited. Instead of the user, the setting may be set by a program or the like.

< construction of video Signal processing section >

The video signal processing unit 11 mainly includes a metadata acquisition unit 21, a display mode management unit 22 (scale determination unit), a display control unit 23, and a power consumption control unit 24 (power consumption calculation unit) in order to execute the various processes described above.

The metadata acquisition unit 21 acquires metadata attached to the video signal. The metadata acquisition unit 21 acquires metadata, and thereby specifies that the video signal that has been input is a video signal conforming to the HDR specification or a video signal conforming to the SDR (standard dynamic range) specification. In the present embodiment, the metadata acquisition unit 21 determines that the video signal that has been input is a video signal conforming to the HDR standard. In addition, the metadata acquisition unit 21 specifies the type of the HDR standard when specifying the video signal conforming to the HDR standard. The metadata obtaining unit 21 may obtain maximum luminance data indicating the maximum luminance of the video signal over a certain period from the metadata.

The display mode management unit 22 determines the display mode of the video signal that has been input (the display ratio of the video that has been input). Specifically, the display mode management unit 22 determines the reduction ratio or the division ratio of the image based on a relationship between a predetermined maximum display luminance of an arbitrary pixel, which is predetermined if the display is possible in the total power consumption calculated by the power consumption control unit 24, and a preset display luminance which is set in advance and is used for faithful luminance display.

Fig. 2 is a diagram illustrating a reduction ratio and a cut ratio, where (a) is a diagram showing an example of a reduced image, and (b) is a diagram showing an example of a cut image.

The reduction ratio is a ratio of the size of the display region (display frame) R21 to the size of the video (full video region R1) displayed in the display region R21 of the display panel 12. The cut-out ratio is a ratio of the size of the cut-out region (display frame) R22 cut out from the full-video region R1 to the size of the full-video region R1 displayed in the display region R21 of the display panel 12. Hereinafter, the display region R21 and the cut region R22 are collectively referred to as a display frame R2.

The display ratio when the entire video image region R1 is displayed in the entire display region R21 is 1. The display ratio when the full-video region R1 is defined as the whole of the cutout region R22 is 1. That is, when the display frame R2 is the full video region R1, the display ratio is 1. On the other hand, the display ratio (that is, the display ratio is larger than 1) when the display frame R2 (display region R21) > the full image region R1 corresponds to the "reduction ratio", and the display ratio (the display ratio is less than 1) when the display frame R2 (cut region R22) < the full image region R1 corresponds to the "cut ratio".

The display ratio may be a ratio of the length of one side of the full video region R1 to the length of one side of the display region R21 or the cutout region R22 corresponding to one side of the full video region R1.

As shown in fig. 2 (a), in the case where the frame R2 (display region R21) > the full image region R1 is displayed, the display device 1 displays a reduced image in which the input image is reduced in accordance with the reduction ratio. As shown in fig. 2 b, when the display frame 2 (the cut region R22) < the full-image region R1, an image is displayed in which a part of the image that has been input is cut in accordance with the cut ratio, and the region other than the cut region R22 that has been cut is set to black (gray value 0). The image including the cut region R22 corresponds to a cut image. The image in the cut region R22 is not an enlarged or reduced image that has been input, but is a part of the image itself that has been input.

That is, the display device 1 includes the display mode management unit 22, and displays a reduced image in which an image that has been input is reduced in accordance with a reduction ratio or a cut image in which an image that has been input is cut in accordance with a cut ratio, based on the set display luminance.

Fig. 3 is a diagram showing a relationship between the total power consumption of the backlight 13 and the maximum display luminance of the display device 1. In this figure, the horizontal axis represents the total power consumption of the backlight 13 that has been normalized, and the vertical axis represents the maximum display luminance of the display device 1. As shown in fig. 3, the maximum display luminance of an arbitrary pixel has a correlation with the total power consumption of the backlight 13, and the display device 1 can display an image at a higher display luminance as the total power consumption is smaller. As shown in fig. 3, the maximum display luminance is constant at 1000nits when the total power consumption is approximately 0.15 or less. That is, in this example, the display peak luminance of the display device 1 is 1000 nits.

The relationship between the total power consumption of the backlight 13 and the maximum display luminance of the display device 1 is based on the following reason as shown in fig. 3. For example, a fully white rectangle having a size of 5% of the area of an image is considered for an image (referred to as image a) in which the image is completely black and an image (referred to as image B) in which the entire image is completely white. When the display device 1 displays the image a, the backlight 13 may be configured to turn on only the light source having the white rectangular portion. Therefore, the display device 1 requires small electric power. On the other hand, when the display device 1 displays the image B, the backlight 13 needs to turn on all the light sources. Therefore, the display device 1 requires a large amount of electric power.

Here, in general, the power supply of the display device often does not have a capacity for supplying as much power as possible when all light sources of the backlight emit light at maximum brightness. This is because of a problem of a heat generation amount when all light sources of the backlight are caused to emit light at the maximum luminance, a problem of a cost of a power supply, and the like. From this fact, the display device performs control to reduce power consumption by causing the light sources having the white rectangular portions to emit light at high luminance when displaying the image a, and causing all the light sources to emit light at a suppressed luminance when displaying the image B. By performing such control alone, the display luminance of the same all-white pixel changes between the image a and the image B. That is, the display luminance varies depending on the image content.

Here, a display device of a comparative example is considered which does not set the display luminance and does not include the display mode management unit 22. In the display device of the comparative example, the output of the backlight 13 is adjusted in accordance with the graph shown in fig. 3.

Specifically, when the total power consumption value calculated for the video that has been input is equal to or less than a predetermined value, the power consumption control unit 34 controls the output of each region of the backlight 13 in accordance with the backlight luminance calculated based on the video signal. For example, in the graph of fig. 3, the power consumption control unit 24 performs the above control when the total power consumption is equal to or less than a value of approximately 0.15 of the maximum total power consumption of the maximum display luminance 1000nits that can be displayed as the display peak luminance. In addition, in the animation, the total power consumption and the backlight luminance are calculated over one frame period.

On the other hand, when the backlight luminance exceeds a predetermined value (for example, approximately 0.15 in the diagram of fig. 3), the power consumption controller 24 controls the output of each region based on a value that uniformly reduces the backlight luminance in each region at a predetermined ratio, for example. For example, in the graph of fig. 3, when the total power consumption is 0.5, the predetermined ratio is the maximum display luminance L2/the set display luminance L1. Thus, the power consumption control unit 24 controls the total power consumption to be kept at or below a predetermined value. At this time, the power consumption controller 24 may output the predetermined ratio (L2/L1) as a feedback gain value to the tone curve calculator 32, which will be described later. In this case, the display luminance included in the low luminance portion of the image may be corrected so as to be close to the luminance of the low luminance portion.

As described above, the display device of the comparative example can display the image with the display peak luminance (1000nits) only under the good condition that the image with the total power consumption equal to or less than the predetermined value (approximately 0.15) can be displayed. That is, in the display device of the comparative example, in the case of displaying an image in which the total power consumption exceeds a predetermined value, the display is difficult. In the example of fig. 3, for example, when the total power consumption (normalized value) is 0.5, the display device of the comparative example can only display the maximum display luminance to 300 nits.

The display device 1 of the present embodiment is configured to set display luminance and includes a display mode management unit 22. Therefore, display can be performed until the display luminance is set.

Hereinafter, a specific process of the display mode management unit 22 will be described. The display mode management unit 22 generates power consumption data indicating a relationship between the display ratio and a relative value based on the total power consumption corresponding to the display ratio. The power consumption data may be in the form of a table.

The display mode management unit 22 compares the generated power consumption data with a luminance ratio that is a ratio of a predetermined maximum display luminance to a set display luminance. When the predetermined maximum display luminance is less than the set display luminance, the display mode management unit 22 determines, as a range (settable range) in which the reduction ratio or the division ratio of the image can be set, a display ratio based on the relative value of the total power consumption being equal to or less than the luminance ratio, in the power consumption data.

Specifically, as shown in fig. 3, the luminance ratio is a ratio (L2/L1) of the maximum display luminance L2 (predetermined maximum display luminance) of the display device 1 of an arbitrary total power consumption to the set display luminance L1.

In the present embodiment, the set display luminance L1 is set to 700 nits. Therefore, for example, the total power consumption calculated by the power consumption control unit 24(Normalized value) is 0.5, the luminance ratio is calculated asThat is, in this case, the display mode management unit 22 determines that the maximum display luminance L2 is less than the full set display luminance L1.

Fig. 4 is a diagram showing an example of power consumption data calculated based on an inputted video signal. Fig. 4 is a graph showing power consumption data in which the horizontal axis represents a display ratio and the vertical axis represents a relative value based on the total power consumption. The relative value based on the total power consumption is a relative value based on the total power consumption when the display ratio is 1. In the example of fig. 4, as a relative value based on the total power consumption, a value (power consumption%) obtained by converting the total power consumption to 0% to 100%. The converted value is a value corresponding to a luminance ratio (L2/L1).

The display mode management unit 22 determines that the maximum display luminance L2 is less than the set display luminance L1, and generates power consumption data indicating a correspondence relationship between a relative value based on the total power consumption of 100% or less and a display ratio included in both the reduction ratio and the division ratio, as shown in fig. 4.

Here, in the case where the display frame R2> the full-video region R1 (see fig. 2 (a)), the total power consumption is reduced as the area of the main full-video region R1 becomes smaller depending on the number of divisions and arrangement of the regions set in the backlight 13. The larger the number of divisions is, the more the power consumption of the backlight is suppressed. The power consumption data shown in fig. 4 is a value depending on the number of divisions and the area of the entire video region R1 in the range where the display ratio is larger than 1. When the display ratio is 1, since an image is displayed in the entire display region, all light sources included in the backlight 13 are controlled. Therefore, since the total power consumption at this time becomes the maximum, the relative value based on the total power consumption is set to 100%.

On the other hand, in the case where the display frame R2 < the full-video region R1 (see fig. 2 (b)), the total power consumption becomes a value that depends on the video signal, and the object with high luminance is present in the full-video region R1 with a larger local area. That is, the total power consumption in this case depends on the display frame position (cutting position) (x, y) of the setting display frame R2. Therefore, in relation to the image that has been input, two parameters of the cutting position (x, y) are searched for in various display ratios, and thereby the maximum value of the total power consumption with respect to the value of each display ratio is calculated in advance. This calculation may be performed by the power consumption control section 24 based on luminance data indicating the luminance of the backlight. Based on the calculation result, in the power consumption data shown in fig. 4, the total power consumption becomes the maximum when the display ratio is 1, and the total power consumption becomes the minimum when the display ratio (the cutting ratio) is 0. Therefore, the relative value based on the total power consumption when the display ratio is 1 is set to 100%, and the relative value based on the total power consumption when the display ratio is 0 is set to 0%. By generating the power consumption data in this manner, power consumption data independent of the cutting position can be generated.

Therefore, in the power consumption data shown in fig. 4, the relative value based on the total power consumption when the display ratio is 1 is the largest, and monotonically decreases as the display ratio becomes smaller or larger than 1.

As described above, the display luminance is set to 700nits, the total power consumption (normalized value) calculated by the power consumption control unit 24 is set to 0.5, and the luminance ratio is set toIn this case, as shown in fig. 4, the display mode management unit 22 determines, as the settable range, a range in which the relative value based on the total power consumption is substantially 0.3 or less and substantially 1.6 or more, which is equal to or less than the luminance ratio, as a result of comparing the power consumption data calculated based on the video signal that has been input with the luminance ratio.

As described above, the range of the display ratio less than 1 corresponds to the cut ratio, and the range of the display ratio greater than 1 corresponds to the reduction ratio. Therefore, a settable range of substantially 0.3 or less is determined as a range in which the cutting ratio can be set, and a settable range of substantially 1.6 or more is determined as a range in which the reduction ratio can be set. As shown in fig. 4, the range of the display ratio other than the settable range is the setting prohibition range.

The display mode management unit 22 determines a reduction ratio or a division ratio as a display ratio within the determined settable range. The display mode management unit 22 selects a display ratio close to the display ratio of the previous frame among display ratios in a settable range with respect to the target frame to be displayed, for example, from the viewpoint of continuous display when the video is moving. On the other hand, the display mode management unit 22 determines the display ratio in a predetermined manner for the first frame of a video that is a moving image or for a still image. For example, the display ratio in the vicinity of the boundary between the settable range and the set prohibition range, among the settable ranges, may be selected.

In addition, the display mode management unit 22 may determine one of the plurality of cutting regions as the actually cut cutting region R22 when the plurality of cutting regions cut at the determined cutting ratio exist. Thus, the display mode management unit 22 specifies the position of the cut region R22 of the image that has been input. The display mode management unit 22 may specify the position corresponding to the cut region R22 cut in the previous frame as the position of the cut region R22 cut in the target frame, or may specify the position by a preset method.

The display mode management unit 22 transmits the display mode parameter including the determined reduction ratio or cutting ratio and other setting values associated therewith to the display control unit 23. Examples of the values included in the display mode parameter include a value indicating a display mode (reduced image display/clipped image display), a reduction ratio of an image, a display start position (x0, y0), a display end position (x1, y1), a clipping start position (xin0, yin0), and a clipping end position (xin1, yin 1).

In the display device 1, when the luminance ratio L2/L1 is equal to or greater than 1, the image that has been input may be directly displayed, as in the display device of the comparative example. That is, the display device 1 may perform lighting control of the backlight 13 without generating the reduced image and the cut image, by using the backlight luminance calculated based on the input image signal or by setting the calculated backlight luminance to a small value. In addition, this reduction in backlight brightness does not uniformly reduce full color tones. The power consumption control unit 24 outputs the feedback gain value to the tone curve calculation unit 32, whereby the display device 1 sets the low luminance portion and the middle luminance portion of the display luminance L1 or less for the image that has been input, and performs accurate luminance display.

However, as shown in embodiment 3, in the case where the luminance ratio L2/L1>1, a part of the display image may be enlarged. In this case, the display mode parameter includes a value indicating an enlarged display as a display mode and an enlargement factor of the video.

The display control unit 23 generates an image to be displayed on the display panel 12 by performing processing on the input image in accordance with the reduction ratio or the division ratio determined by the display mode management unit 22. The display control unit 23 includes a display mode switching unit 31, a tone curve calculation unit 32, a tone curve processing unit 33, and a luminance calculation/video signal correction unit 34.

The display mode switching unit 31 switches the display mode in accordance with the display mode parameter from the display mode management unit 22. Specifically, the display mode switching unit 31 performs adjustment such as scaling processing (scaling processing) on the video signal that has been input, and thereby generates a reduced image or a cut image as a result of switching the display mode. The display mode switching unit 31 performs processing (e.g., scaling processing and display position adjustment) for enabling window (window) display of images or multi-image display (see embodiment 2) in accordance with the display mode parameter. The display mode switching unit 31 outputs the adjusted video signal (adjusted video signal) to the tone curve processing unit 33.

The tone curve calculating section 32 analyzes the metadata acquired by the metadata acquiring section 21, thereby specifying an EOTF (Electro-Optical Transfer Function Electro-Optical conversion characteristic) defined for each HDR specification. The tone curve calculation unit 32 calculates a tone curve (specifically, look up a conversion table) so as to perform processing such as applying a knee curve (knee curve) to the EOTF in accordance with the maximum display luminance which is an actual display performance limit different for each display device 1, as in the conventional technique. The tone curve calculating section 32 outputs the calculated look-up conversion table to the tone curve processing section 33 as a tone curve parameter. In the case of moving images, tone curves are calculated for each frame.

The tone curve processing section 33 applies a tone curve to the adjusted video signal (in the case of moving images, each frame) from the display mode switching section 31 by using the look-up conversion table calculated by the tone curve calculating section 32 and the operation processing circuit. Thereby, the luminance conversion processing for the video signal is performed. In the present embodiment, a tone curve is applied to a reduced image or a cut image generated based on the display mode determined by the display mode switching unit 31. The tone curve processing section 33 outputs the video signal (processed video signal) to which the tone curve is applied to the luminance calculation/video signal correction section 34.

The luminance calculation/image signal correction unit 34 displays the reduced image or the cut image to which the tone curve is applied by the tone curve processing unit 33 on the display panel 12 by using a so-called local dimming function. Specifically, in a state where the display panel 12 and the backlight 13 are divided into a plurality of regions, the luminance calculation/video signal correction unit 34 calculates the backlight luminance of the backlight 13 according to the luminance of the image reflected in each region of the display panel 12. The luminance calculation/video signal correction unit 34 adjusts the luminance of the video in accordance with the calculated backlight luminance.

The luminance calculation/video signal correction unit 34 outputs luminance data indicating the calculated backlight luminance to the power consumption control unit 24. The luminance calculation/video signal correction unit 34 outputs a corrected video signal indicating the video having the adjusted luminance to the display panel 12. The display panel 12 displays an image indicated by the corrected image signal.

The power consumption control unit 24 calculates the total power consumption of the backlight 13 when displaying the inputted image, and manages the total power consumption to be equal to or less than a predetermined value.

In the present embodiment, the power consumption controller 24 calculates the total power consumption for the display ratio, and outputs the calculation result to the display mode manager 22 as a feedback gain value. Thereby, the display mode management unit 22 can generate power consumption data.

The power consumption controller 24 calculates the maximum display luminance L2 (luminance ratio L2/L1) of the display device 1 of an arbitrary total power consumption with respect to the set display luminance L1 inputted from the operation unit 14, and outputs the calculated value to the display mode manager 22 as a feedback gain value. Thus, the display mode management unit 22 can determine the settable range by comparing the power consumption data with the luminance ratio.

The power consumption controller 24 calculates the total power consumption when outputting the reduced image or the cut image based on the luminance data from the luminance calculation/video signal correction unit 34. The power consumption control unit 24 outputs the luminance data to the backlight 13, thereby controlling the output of the backlight 13 based on the local dimming function.

In addition, as in the display device of the comparative example, the power consumption control unit 24 may output the luminance ratio to the tone curve calculation unit 32 as a feedback gain value. In this case, the display luminance included in the low luminance portion of the image may be corrected so as to be close to the luminance of the low luminance portion.

< method for controlling display device >

Next, a control method (display method) of the display device 1 will be described with reference to fig. 5. Fig. 5 is a flowchart showing an example of processing of the display device 1.

As shown in fig. 5, when a video signal is input (S1), the metadata acquisition unit 21 acquires metadata. The acquired metadata is output to the tone curve calculation unit 32 via the display mode management unit 22. The acquired metadata may be directly output from the metadata acquisition unit 21 to the tone curve calculation unit 32 without passing through the display mode management unit 22. The power consumption control unit 24 calculates the total power consumption corresponding to the display ratio and the luminance ratio (S2: power consumption calculation step).

The display mode management unit 22 generates power consumption data based on the calculation result (S3). The display mode management unit 22 compares the generated power consumption data with the luminance ratio (S4). The display mode management unit 22 compares the power consumption data with the luminance ratio to determine a displayable setting range of the display ratio (S5: ratio determination step). The display mode management unit 22 selects one display ratio from the settable range by a predetermined method, and determines an applicable display ratio (reduction ratio or cutting ratio) (S6: ratio determination step). The display mode management unit 22 outputs a display mode parameter including the determined display ratio to the display mode switching unit 31.

The display mode switching unit 31 generates a reduced image or a cut image according to the display mode parameter, and outputs an adjusted image signal indicating the reduced image or the cut image to the tone curve processing unit 33 (S7: reduced image or cut image generating step). The tone curve calculation unit 32 is combined with the processes of S2 to S7, calculates a look-up conversion table, and outputs the calculation result as a tone curve parameter to the tone curve processing unit 33. The tone curve processing unit 33 generates a processed video signal by applying a tone curve based on the tone curve parameter to the adjusted video signal, and outputs the processed video signal to the luminance calculation/video signal correction unit 34 (S8).

The luminance calculation/video signal correction unit 34 performs a local dimming process on the processed video signal to generate a corrected video signal and luminance data (S9: local dimming process step). The luminance calculation/video signal correction unit 34 outputs the corrected video signal to the display panel 12, and outputs luminance data to the backlight 13 via the power consumption control unit 24. Thus, the reduced image or the cut image is displayed on the display panel 12 by the local dimming function (S10: display control step).

< effects >

In this way, the display device 1 displays an image at a reduction ratio or a cut-out ratio determined based on the relationship between the maximum display luminance L2 estimated in advance and the preset display luminance L1. Therefore, the image can be displayed with faithful brightness until the display brightness L1 is set.

Therefore, the display device 1 can display the image with faithful brightness, without displaying the image with unexpected brightness. That is, the display device 1 may ensure display of the image until the set display luminance L1 (predetermined high luminance region) so that the display luminance of the image does not depend on the display device. Further, it is possible to prevent a decrease in the reproducibility of a display image with respect to an already input image, which is caused by a decrease in the maximum display luminance depending on an image signal when an image is displayed depending on a display condition.

[ embodiment 2]

Other embodiments of the present disclosure will be described below. For convenience of explanation, the same reference numerals are given to the components and components having the same functions as those described in the above embodiments, and the explanation thereof will not be repeated.

Fig. 6 is a diagram showing a relationship between the total power consumption of the backlight 13 and the maximum display luminance L2 of the display device 1. In this figure, when displaying an image at the reduction ratio or the division ratio determined by the display mode management unit 22, the other-image display luminance L3 is set so that an image different from the image displayed at the reduction ratio or the division ratio can be displayed. The display mode management unit 22 uses a ratio obtained by subtracting the other image display luminance L3 from the maximum display luminance L2 with respect to the set display luminance L1 as the luminance ratio ((L2-L3)/L1).

The other-image display luminance L3 is the display luminance for displaying the other image. In other words, the other-image display luminance L3 is the display luminance for multi-image display (multi-screen display). The other video is a video different from the HDR video which is the reduced video, or a video included in a region other than the cut region R22 of the cut video, and examples thereof include an SDR video.

For example, in the case where the display luminance L1 is set to 700nits, the maximum display luminance L2 is set to 300nits, and the other image display luminance L3 is set to 100nits, the power consumption control unit 24 calculates the luminance ratio as (300-)/700 nits. The display mode management unit 22 receives the calculation result (luminance ratio) as a feedback gain value, and compares the luminance ratio with the power consumption data.

Fig. 7 is a diagram showing an example of a display screen according to the present embodiment, where (a) is an example of a display screen on which multi-image display is performed that is realized when a reduced image is displayed, and (b) is an example of a display screen on which multi-image display is performed that is realized when a cut image is displayed.

In fig. 7 (a), two SDR videos Im1 and Im2 different from the reduced HDR video (full video area R1) are displayed as other videos. In this case, as another video, a video to which various information is added can be displayed. The display mode management unit 22 also determines the reduction ratios of the HDR image and the other images with reference to the number and size of the other images.

In fig. 7 b, of the HDR video (full-video region R1) as the clip video, the other region R3 other than the clip region R22, in which the luminance is adjusted so as not to exceed the total power consumption, is displayed as the other video. The multi-image display according to the present embodiment is a concept including any one of the display modes (a) and (b) of fig. 7.

In this way, the display device 1 according to the present embodiment can display the HDR image up to the set display luminance L1 at the reduction ratio or the division ratio determined by the display mode management unit 22. In addition, the display device 1 of the present embodiment can display a reduced image or a cut image as an HDR image in a multi-image display mode. That is, in the display device 1 of the present embodiment, it is possible to perform multi-image display while maintaining the preset set display luminance L1 so that the total power consumption calculated for the image that has been input does not exceed.

[ embodiment 3]

Other embodiments of the present disclosure will be described below. For convenience of explanation, the same reference numerals are given to the components and components having the same functions as those described in the above embodiments, and the explanation thereof will not be repeated.

In embodiments 1 and 2, the display device 1 will be described as displaying an already input image directly on the display panel 12 when the maximum display luminance L2 is equal to or higher than the set display luminance L1. However, in the display device 1, when the maximum display luminance L2 is equal to or higher than the set display luminance L1, the following three display schemes can be realized.

(1) The image is directly displayed (full screen display).

(2) And (5) amplifying and displaying the image.

(3) When the video is a moving image, if a reduced video or a cut video is generated in a previous frame, the reduced video or the cut video is generated based on a display ratio equal to or close to the display ratio of the previous frame.

Here, a case where the maximum display luminance L2 is greater than the set display luminance L1 is referred to as a state where there is a margin in the total power consumption. In this case, a part of the image can be displayed in an enlarged manner in the entire display area (zoom display).

Fig. 8 is a diagram showing another example of power consumption data calculated based on an inputted video signal. The display mode management unit 22 determines that the maximum display luminance L2 is greater than the set display luminance L1, and generates power consumption data shown in fig. 8, which is different from the power consumption data shown in fig. 4. Hereinafter, in the present embodiment, the power consumption data shown in fig. 4 is referred to as first power consumption data, and the power consumption data shown in fig. 8 is referred to as second power consumption data.

The display mode management unit 22 uses the second power consumption data to specify a part of the video to be enlarged to the entire display area (that is, to specify the cut region R22 to be cut as a part of the video).

The display ratio of the second power consumption data is data indicating a relationship between a relative value based on the total power consumption and the display ratio, as in the first power consumption data. However, since the second power consumption data is used for cutting a part of the image, the display ratio of the second power consumption data is set to 1 or less. That is, the display ratio includes only the cut scale.

The second power consumption data is generated by previously calculating the maximum value of the total power consumption for each display ratio in relation to the image that has been input, as in the first power consumption data.

In the present embodiment, since the divided region R22 is displayed in an enlarged manner on the entire display region, the smaller the divided region R22 is (the smaller the display ratio is), the larger the enlargement ratio is, and as a result, the power consumption at the time of enlarged display becomes large. The larger the proportion of the high-luminance region of the cutout region R22, the larger the power consumption at the time of enlarged display. When the size of the high brightness region is smaller than the size of the cut region R22, the power consumption is saturated at the maximum value.

Therefore, the power consumption at the time of the enlarged display is larger than the power consumption at the time of the display ratio being 1 (at the time of displaying the entire image in the entire display region). Specifically, the power consumption is the minimum when the display ratio is 1, and the maximum when the display ratio is 0.

Therefore, when the second power consumption data is generated based on the calculation result of the maximum value of the total power consumption with respect to the value of each display ratio, the relative value based on the total power consumption increases as the display ratio becomes smaller, when the relative value based on the total power consumption when the display ratio is 1 in the second power consumption data is set to 100%.

The display mode management unit 22 determines that the luminance ratio (L2/L1) calculated based on the video signal that has been input is greater than 1, and compares the luminance ratio (L2/L1) with the second power consumption data calculated based on the video signal, as in embodiment 1. The display mode management unit 22 determines, as a settable range, a range of display ratios in which the relative value of the total power consumption is equal to or less than the luminance ratio, based on the result of the comparison.

For example, a case is considered in which the set display luminance L1 is set to 700nits, and the total power consumption (normalized value) calculated by the power consumption control unit 24 is approximately 0.17. In this case, from the graph shown in fig. 3, the maximum display luminance L2 is approximately 840 nits. Therefore, the luminance ratio L2/L1 was calculated as 840/700 ═ 1.2 (120%). By comparing this luminance ratio with the second power consumption data, as shown in fig. 8, a range of approximately 0.6 or more below the luminance ratio based on the relative value of the total power consumption is determined as a settable range, and a range of the display ratio other than the settable range is determined as a setting prohibition range.

Fig. 9 is a diagram for explaining an enlarged display of the cutting region R22. Fig. 9 shows a state in which an image before cutting is displayed in the entire display area. The display mode management unit 22 sets a display ratio (cutting ratio) of 1 within the settable range as a display mode. As shown in fig. 9, the display controller 23 generates a display image so that the entire display area is enlarged and displayed in the display panel 12 in the divided area R22 divided from the full-video area R1 at the division ratio.

In this way, the display device 1 according to the present embodiment can perform enlarged display of the divided region R22 while ensuring preset display luminance (accurate display luminance) when there is a margin in the total power consumption.

< modification example >

The cut region R22 may be displayed in an enlarged manner over the entire display region, but may be displayed in an enlarged manner to a region smaller than the display region. For example, the cut region R22 may be cut out of the reduced image, and the cut region R22 may be enlarged and displayed until the size of the reduced image is reduced.

The cutting region R22 is not enlarged or reduced as described in embodiment 1. Therefore, the cut region R22 is shown as Dot by Dot. On the other hand, the reduced image is an image that has been input and is reduced. The display device 1 according to the present modification is configured to display a part of a reduced image in a state close to the display state of Dot by dividing the divided region R22 from the reduced image and displaying the divided region R22 in an enlarged manner. That is, a part of the reduced image can be displayed in a state close to the resolution of the original video (the video that has been input).

Specifically, the display mode management unit 22 generates first power consumption data (see fig. 4) and second power consumption data (see fig. 8) based on the video signal that has been input. The display mode management unit 22 generates a reduced image using the first power consumption data, and then displays the reduced image in an enlarged manner using the second power consumption data. That is, the display mode management unit 22 enlarges and displays the reduced image using two parameters of the display ratio, which are the first power consumption data and the second power consumption data.

The display mode management unit 22 is configured to determine the settable range by generating the first power consumption data and comparing the first power consumption data with the luminance ratio, as in embodiments 1 and 2, when the maximum display luminance L2 is smaller than the set display luminance L1.

In the present modification, the display mode management unit 22 sets in advance a display ratio corresponding to a value that is likely to become smaller than L2/L1 × 100 (%) based on the relative value of the total power consumption within a settable range. As this display ratio, for example, a value that is as small as possible relative to the total power consumption may be set. This display ratio may also be set by the user.

In addition, as described in embodiment 1, the first power consumption data is such that when the display ratio is larger than 1, the area of the entire main image region R1 decreases as the area decreases depending on the display device 1. Therefore, when the display ratio is larger than 1, the relationship between the display ratio and the relative value based on the total power consumption does not change depending on the video signal.

The display mode management unit 22 reduces the image that has been input at a preset display ratio (reduction ratio). For example, the preset display ratio is set to 2.25. The display luminance L1 was set to 700nits, and the maximum display luminance L2 was set to 300 nits. In this case, the luminance ratio (L2/L1) is set to be approximately 25% based on the relative value (predetermined relative value W1) of the total power consumption corresponding to the preset display ratio of 2.25 In this case, the luminance ratio L2/L1 (43%) > the predetermined relative value W1 (25%) results in a margin in the total power consumption when the reduced image is generated at the display ratio of 2.25, as compared with the case where the reduced image is generated at the display ratio of about 1.6. That is, since the total power consumption assumed when the reduced image for specifying the cutting region R22 is displayed is smaller than the limit value of the total power consumption or a value in the vicinity thereof, a margin is generated in the total power consumption. Therefore, the display mode management unit 22 can generate the second power consumption data for the reduced image. That is, the reduced video generates the second power consumption data as the full video area R1.

The display mode management unit 22 compares the second power consumption meter with the ratio of power consumption ((L2/L1)/W1), and thereby determines the range of the display ratio that is equal to or less than the ratio of power consumption as the settable range. That is, in this case, the display mode management unit 22 compares the ratio of power consumption with the second power consumption table as the luminance ratio. The display mode management unit 22 determines a display ratio within the settable range, and thereby cuts the divided region R22 from the reduced image. Thus, in a state closer to Dot byDot, the cut region R22 can be enlarged and displayed until the size of the image is reduced.

In addition, in the display device 1 other than the present modification, display until the display luminance is set is realized by using one parameter of the display ratio, which is called the first power consumption data or the second power consumption data. In this case, the display mode management unit 22 automatically and continuously generates (that is, determines and changes) the first power consumption data or the second power consumption data each time the video signal is input.

Fig. 10 is a diagram for explaining an enlarged display of the cut region R22 of the display device 1 according to the present modification. Fig. 10 shows a state in which a reduced image before cutting is displayed. As shown in fig. 10, the display mode management unit 22 generates a reduced image, and then cuts the reduced image into a display region R21 and a cut region R22 from the reduced image. The cut region R22 is enlarged and displayed up to the display region R21 as the reduced image.

In this way, the display device 1 of the present embodiment can enlarge and display the cut region R22 across a region smaller than the display region, instead of the entire display region. The display device 1 according to the present modification generates a reduced image so as to have a margin for power consumption, and thereby can perform display of a reduced image closer to Dot by Dot while ensuring a preset display luminance (correct display luminance).

[ embodiment 4]

Other embodiments of the present disclosure will be described below. For convenience of explanation, the same reference numerals are given to the components and components having the same functions as those described in the above embodiments, and the explanation thereof will not be repeated.

Fig. 11 is a block diagram showing an example of the configuration of the display device 2 according to the present embodiment. In embodiment 1, the display device 1 includes a liquid crystal panel as the display panel 12 and a backlight 13, but is not limited to this configuration. As shown in fig. 11, the display device 2 of the present embodiment includes a display panel 12A (display portion) including a plurality of self-light emitting elements (light sources and display elements). The display panel 12A is, for example, an OLED display or a plasma display, but may be a display including other self-light emitting elements.

Since the display panel 12A is used, the display device 2 does not include the backlight 13 unlike the display device 1. Since the display device 24 does not include the backlight 13, the video signal processing unit 11A does not include the luminance calculation/video signal correction unit 34 in the display control unit 23A, and includes the power consumption control unit 24A instead of the power consumption control unit 24.

That is, the display device of the present disclosure can be applied to a display device in which power consumption of a backlight or a self-luminous element is changed as a whole.

In the display device 2, the processed video signal processed by the tone curve processing section 33 is input to the display panel 12A. The light emitting elements of the display panel 12A emit light at a luminance corresponding to a predetermined light emission current value corresponding to each pixel (for example, a gradation value or a luminance value) of the processed video signal.

The power consumption control unit 24A calculates the total power consumption of the plurality of self-luminous elements included in the display panel 12A when the input image is displayed, and manages the total power consumption of the display panel 12A to be equal to or less than a predetermined value.

Unlike the power consumption control unit 24, the power consumption control unit 24A inputs the processed video signal from the tone curve processing unit 33, not the luminance data. The processed video signal (that is, the video signal that has been input) corresponds to the light emission current value for each pixel or each pixel cell of the display panel 12A. Therefore, the power consumption controller 24A calculates the total power consumption of the display panel 12A from the pixel values of the video signal.

The power consumption controller 24A is different from the power consumption controller 24, and naturally does not have a so-called local dimming function.

The power consumption controller 24A has the same function as the power consumption controller 24 except for the above-described function. That is, the power consumption controller 24A calculates the total power consumption of the display panel 12A corresponding to the display ratio, or calculates the luminance ratio (L2/L1). Therefore, similarly to embodiment 1, the display device 2 displays an image at a reduced scale or a cut-out scale, thereby improving the reproducibility of the original brightness of the image when the image is displayed.

Here, the maximum current that can emit light exists in each light emitting element. That is, each light emitting element can emit light up to a luminance corresponding to the maximum current. However, the total power consumption of the entire display panel 12A is greatly different depending on whether or not the self-light emitting elements of a part of the display panel 12A emit light, or whether or not the self-light emitting elements of the entire display panel 12A emit light. That is, the display luminance of the display panel 12A has a different limit value depending on the image displayed on the display panel 12A or the display mode thereof.

When light is emitted only on a part of the display panel 12A, the power consumption control unit 24A outputs the maximum display luminance of the display panel 12A corresponding to the total power consumption as the feedback gain value to the display mode management unit 22 and the tone curve calculation unit 32. This makes it possible to notify the display mode management unit 22 and the tone curve calculation unit 32 that the self-light emitting element can emit light at a higher luminance. In addition, it can be said that when only a part of the display panel 12A emits light, the total power consumption value is relatively small and the maximum display luminance value is relatively large.

[ implementation by software ]

The control modules of the display devices 1 and 2 (in particular, the respective units included in the video signal processing units 11 and 11A) may be implemented by logic circuits (hardware) formed by integrated circuits (IC chips) or the like, or may be implemented by software.

In the latter case, the display devices 1 and 2 include a computer that executes a command of a program of software for realizing each function. The computer includes, for example, one computer-readable recording medium including at least one processor (control device) and storing the program. In the computer, the processor reads the program from the recording medium and executes the program, thereby achieving the object of the present disclosure. As the processor, for example, a cpu (central processing unit) can be used. As the recording medium, a "non-transitory tangible medium" can be used, and examples thereof include a magnetic tape, a hard disk, a card, a semiconductor memory, a programmable logic circuit, and the like, in addition to a rom (read Only memory). The present invention may further include a ram (random Access memory) for developing the above-described program. The program may be supplied to the computer via an arbitrary transmission medium (a communication network, a broadcast wave, or the like) through which the program can be transmitted. In addition, an aspect of the present disclosure may be implemented as a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

[ conclusion ]

The display device of aspect 1 of the present disclosure includes: a power consumption calculation unit that calculates the total power consumption of the plurality of light sources when the input image is displayed; a scale determination unit that determines a reduction scale or a division scale of the image based on a relationship between a predetermined maximum display luminance of an arbitrary pixel, which is displayable in a predetermined manner, and a set display luminance that is a maximum value of display luminance for performing faithful luminance display, which is set in advance, in the total power consumption calculated by the power consumption calculation unit; and a display control unit that performs processing on the video in accordance with the reduction ratio or the cutting ratio determined by the ratio determination unit.

In the conventional display device, the display of the video is limited to the display up to the predetermined maximum display luminance determined for the predetermined total power consumption. That is, in the conventional display device, the display luminance of the image depends on the display device.

According to the above configuration, the image is displayed at a reduced scale or a cut scale determined based on a relationship between the predetermined maximum display luminance and the set display luminance. Therefore, the display of the image until the display brightness is set can be performed so as not to exceed the predetermined total power consumption. That is, unlike the conventional display device, the image may be displayed such that the display luminance of the image does not depend on the display device. Therefore, the reproducibility of the original brightness of the image when the image is displayed can be improved.

Further, the set display luminance is set to such an extent that the image can be displayed faithfully, whereby the original luminance of the image can be reproduced more faithfully particularly when the predetermined maximum display luminance is less than the set display luminance.

In addition, in the display device according to claim 2 of the present disclosure, according to claim 1, the display device may include: a display unit that displays the image; wherein the ratio determination unit generates (i) a display ratio of a size of a display area displayed on the display unit to a size of the video, or a display ratio of a size of a cut area cut out from the video to a size of the video displayed on the display unit, and (ii) power consumption data indicating a relationship based on a relative value of the total power consumption corresponding to the display ratio; the power consumption data is compared with a luminance ratio, which is a ratio of the predetermined maximum display luminance to the set display luminance, to determine a reduction ratio or a division ratio of the image.

According to the above configuration, the reduction ratio or the division ratio at which the image can be displayed until the display luminance is set can be determined by comparing the power consumption data with the luminance ratio.

In the display device according to claim 3 of the present disclosure, in claim 2, the ratio determination unit may determine, as a range in which a reduction ratio or a cut ratio of the video can be set, the display ratio that is equal to or less than the luminance ratio based on the total power consumption relative value in the power consumption data.

According to the above configuration, the image can be displayed until the display brightness is set by reducing or dividing the image within a range in which the reduction ratio or the division ratio can be set.

In the display device according to claim 4 of the present disclosure, in claim 2 or 3, when the video is displayed at the reduced scale or the cut-out scale determined by the scale determination unit, the display luminance of the other video for displaying the other video may be set so that the other video different from the video displayed at the reduced scale or the cut-out scale can be displayed; the ratio determination unit uses, as the luminance ratio, a ratio obtained by subtracting the other display luminance from the predetermined maximum display luminance with respect to the set display luminance.

According to the above configuration, the display of the video up to the setting of the display luminance and the display of the other video may be performed so as not to exceed the predetermined total power consumption. That is, the multi-image display can be realized so that the predetermined total power consumption is not exceeded.

In the display device according to claim 5 of the present disclosure, in any one of the aspects 1 to 3, when there is a margin for the total power consumption, the display control unit may perform the processing on the video so as to enlarge and display the video divided according to the division ratio determined by the ratio determination unit.

According to the above configuration, when there is a margin in the total power consumption, the image that has been cut can be displayed in an enlarged manner at the cut scale using the margin of the total power consumption.

In addition, in the display device according to claim 6 of the present disclosure, in any one of the above-described aspects 1 to 5, the display device may further include: a display unit that displays the image; wherein the display portion includes: a liquid crystal panel, and a backlight including the plurality of light sources, the luminance of which can be independently adjusted for each of the regions divided into a plurality of regions.

According to the above configuration, in the display device including the liquid crystal panel, the image can be displayed such that the display luminance of the image does not depend on the display device. Therefore, the reproducibility of the original brightness of the image when the image is displayed can be improved.

In addition, in the display device according to claim 7 of the present disclosure, in any one of the above-described aspects 1 to 5, the display device may further include: a display unit that displays the image; wherein the display portion is a display panel including a plurality of self-light emitting elements; the plurality of self-light emitting elements are the plurality of light sources.

According to the above configuration, in a display device including a liquid crystal panel including a plurality of self-light emitting elements, such as an OLED display, for example, an image can be displayed such that the display luminance of the image does not depend on the display device. Therefore, the reproducibility of the original brightness of the image when the image is displayed can be improved.

Further, the display method of aspect 8 of the present disclosure includes: a power consumption calculation step of calculating total power consumption of the plurality of light sources when the input image is displayed; a scale determining step of determining a reduction scale or a cut scale of the image based on a relationship between a predetermined maximum display luminance of an arbitrary pixel, which is displayable in advance, and a set display luminance which is a maximum value of display luminance for performing faithful luminance display, which is set in advance, in the total power consumption calculated in the power consumption calculating step; and a display control step of performing processing on the image in accordance with the reduction ratio or the division ratio determined in the ratio determination step.

According to the above method, the same effect as that of the display device of claim 1 is obtained.

In addition, the display device according to each aspect of the present disclosure may be realized by a computer, and in this case, a display control program of the display device realized by a computer by operating a computer as each part (software element) included in the display device and thereby causing the display device to function as a computer, and a computer-readable recording medium recording the program also fall within the scope of the present disclosure.

[ notes of attachment ]

The present disclosure is not limited to the above embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. Further, by combining the technical methods disclosed in the respective embodiments, new technical features can be formed.

(CROSS-REFERENCE TO RELATED APPLICATIONS)

The present application is for japanese patent application filed on 10/1/2018: the interest of priority is claimed in Japanese patent application 2018-001777, the contents of which are hereby incorporated in their entirety into the present specification.

Description of the reference numerals

1. A display device; 12. 12a.. display panel (display portion); a backlight (display, light source); a display mode management unit (ratio determination unit); 23. a display control section; 24. a power consumption control unit (power consumption calculation unit); im1, Im2.. SDR images (other images); l1.. setting display brightness; l2.. maximum display brightness (given maximum display brightness); l3. other image display brightness; other areas (other images)