JP2021152619A - Liquid crystal display device - Google Patents

Abstract

To provide a liquid crystal display device capable of enhancing a view angle property while suppressing a flicker feeling of an image.SOLUTION: A liquid crystal display device comprises: a liquid crystal panel in which a plurality of pixels capable of controlling light transmissivity of a liquid crystal are provided in a matrix shape; a back light including a plurality of light-emitting blocks respectively irradiating, with light, a plurality of display areas obtained by dividing the liquid crystal panel so as to include at least one of the plurality of pixels; a display control unit for alternately switching a target pixel which is any pixel included in any one of the plurality of display areas to a light pixel of relatively high light transmissivity and a dark pixel of relatively low light transmissivity; and a light emission control unit for alternately switching luminance of a target block to irradiate the target pixel with light among the plurality of light-emitting blocks to first luminance and second luminance equal to or higher than the first luminance in accordance with alternately switching the target pixel to the light pixel and the dark pixel.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a liquid crystal display device.

For example, the liquid crystal display device disclosed in Patent Document 1 has a liquid crystal display panel capable of gradation display in which each of a plurality of unit pixels has a plurality of sub-pixels. In this liquid crystal display device, two sub-pixels are provided for each unit pixel corresponding to each color of RGB. Each sub-pixel can be controlled by an applied voltage into a bright pixel having a relatively high light transmittance and a dark pixel having a relatively low light transmittance. The control means is to each sub-pixel so that the two sub-pixels of each unit pixel are a combination of a bright pixel and a dark pixel, and each sub-pixel is alternately switched between a bright pixel and a dark pixel. The applied voltage is changed for each frame.

Japanese Unexamined Patent Publication No. 2006-189648

According to the apparatus disclosed in Patent Document 1, since each sub-pixel is repeatedly switched between a bright pixel and a dark pixel in the liquid crystal display panel, the user may perceive image flicker (so-called flicker feeling). One aspect of the present disclosure is to provide a liquid crystal display device capable of improving viewing angle characteristics while suppressing a feeling of flicker in an image.

The liquid crystal display device of one aspect of the present disclosure includes a liquid crystal panel in which a plurality of pixels capable of controlling the light transmission rate of the liquid crystal are provided in a matrix, and the liquid crystal panel so as to include at least one of the plurality of pixels. A backlight having a plurality of light emitting blocks that irradiate light toward a plurality of divided display areas, and a target pixel that is an arbitrary pixel included in any of the plurality of display areas, have a light transmission coefficient. A display control unit that alternately switches between a bright pixel having a relatively high light transmittance and a dark pixel having a relatively low light transmittance, and a target pixel that is alternately switched between the bright pixel and the dark pixel. A light emitting control unit that alternately switches the brightness of the target block that irradiates the target pixel with light among the plurality of light emitting blocks between the first brightness and the second brightness equal to or higher than the first brightness.

It is a block diagram which shows the structure of the liquid crystal display device. It is a front view which shows typically the structure of the panel body which concerns on 1st Embodiment. It is a front view which shows the structure of the display area schematically. It is a figure which shows an example of the data structure of the light-dark separation table. It is a graph which shows the relationship between the area brightness and BL current defined by a light-dark separation table. It is a figure which shows an example of image data. It is a figure for demonstrating display control of a screen area. It is a figure for demonstrating display control of a screen area. It is a figure which shows the driving mode of the panel body based on (n) a frame in 1st Embodiment. It is a figure which shows the driving mode of the panel body based on the (n + 1) frame in 1st Embodiment. It is a figure which shows the display mode of the panel body at the time of input of each frame. It is a figure which shows an example of the data structure of the light-dark separation table. It is a graph which shows the relationship between the area brightness and BL current defined by a light-dark separation table. It is a figure which shows the driving mode of the panel body based on (n) a frame in 2nd Embodiment. It is a figure which shows the driving mode of the panel body based on the (n + 1) frame in the 2nd Embodiment. It is a figure which shows the driving mode of the panel body based on (n) a frame in 3rd Embodiment. It is a figure which shows the driving mode of the panel body based on the (n + 1) frame in the 3rd Embodiment. It is a figure which shows the driving mode of the panel body based on (n) a frame in 4th Embodiment. It is a figure which shows the driving mode of the panel body based on the (n + 1) frame in 4th Embodiment. It is a figure which shows the driving mode of the panel body in the 1st modification. It is a figure which shows the driving mode of the panel body in the 2nd modification. It is a figure which shows the driving mode of the panel body in the 3rd modification. It is a figure which shows the driving mode of a panel body in 4th modification.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.

(First Embodiment)
The configuration of the liquid crystal display device 1 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a block diagram showing a configuration of a liquid crystal display device 1. FIG. 2 is a front view schematically showing the configuration of the panel main body 110 according to the first embodiment. FIG. 3 is a front view schematically showing the configuration of the display area 131.

As shown in FIG. 1, the liquid crystal display device 1 includes a control unit 100 and a panel main body 110. The control unit 100 is provided on the control board of the liquid crystal display device 1, for example, and controls the image display of the panel body 110 and the like. The panel body 110 has a backlight 120 and a liquid crystal panel 130. The liquid crystal panel 130 is provided with a plurality of pixels 140 (see FIG. 3) capable of controlling the light transmittance of the liquid crystal in a matrix (two-dimensional shape) in a front view. In the liquid crystal panel 130 of the present embodiment, one pixel 140 is composed of a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. Each of the plurality of pixels 140 can display a color of a predetermined gradation (for example, 256 gradations).

The backlight 120 is arranged on the back side of the liquid crystal panel 130 and irradiates the liquid crystal panel 130 with light. As shown in FIG. 2, the backlight 120 of the present embodiment is a surface light source in which a plurality of LEDs (see circles in the figure) are arranged two-dimensionally. The backlight 120 has a plurality of light emitting blocks 121 that irradiate light toward a plurality of display areas 131 in which the liquid crystal panel 130 is divided so as to include at least one of the plurality of pixels 140. The plurality of light emitting blocks 121 are arranged in a matrix in a front view, and have the same size and shape (square shape in this example). Each light emitting block 121 includes the same number of LEDs and a plurality of LEDs, and can irradiate light toward different display areas 131.

The plurality of light emitting blocks 121 correspond one-to-one with the plurality of display areas 131. In the example of FIG. 2, a total of 24 light emitting blocks 121 are arranged so as to be arranged in six in the row direction and four in the column direction. Correspondingly, a total of 24 display areas 131 are arranged so as to be arranged in six in the row direction and four in the column direction. One light emitting block 121 and one display area 131 corresponding to each other form one screen area 111 (see FIG. 9). Therefore, the panel body 110 includes a total of 24 screen areas 111 arranged in six in the row direction and four in the column direction. The backlight 120 can selectively irradiate the display area 131 corresponding to the arbitrary light emitting block 121 among the plurality of display areas 131.

The control unit 100 includes a local dimming control unit 101, a light emission control unit 102, a display control unit 103, and the like. The local dimming control unit 101 is a digital circuit for executing local dimming control. The local dimming control unit 101 calculates BL control data indicating a current value for controlling the brightness of each light emitting block 121 based on the input image data, and outputs the BL control data to the light emitting control unit 102. In this specification, BL is an abbreviation for backlight.

Further, the local dimming control unit 101 calculates the gradation data of each pixel 140 included in the display area 131 based on the input image data and the target brightness of each light emitting block 121, and outputs the gradation data to the display control unit 103. do. For example, the local dimming control unit 101 outputs BL control data and gradation data for displaying a frame-based video on the panel main body 110 based on the video data which is the input image data.

The light emission control unit 102 is a digital circuit for controlling light emission of each light emission block 121 based on the input BL control data. The display control unit 103 is a digital circuit for performing liquid crystal drive control of each display area 131 (that is, a plurality of pixels 140) based on the input gradation data. The light emission control by the light emission control unit 102 and the liquid crystal drive control by the display control unit 103 are executed in synchronization with each frame by the synchronization circuit of the control unit 100. In such local dimming, the brightness of the light emitting block 121 corresponding to each display area 131 is locally controlled, so that a high-contrast image can be displayed on the panel body 110.

In the present embodiment, the display control unit 103 sets the target pixel, which is an arbitrary pixel 140 included in any of the plurality of display areas 131, into a bright pixel having a relatively high light transmittance and a relative light transmittance. Alternately switch to low dark pixels. The light emission control unit 102 sets the brightness of the target block that irradiates the target pixel with light among the plurality of light emission blocks 121 as the first brightness as the target pixel is alternately switched between the bright pixel and the dark pixel. It switches alternately to the second brightness higher than the first brightness. Details of these controls will be described later.

The local dimming control unit 101, the light emission control unit 102, the display control unit 103, and the like may be mounted by an analog circuit, or may be incorporated in a single video processor. The control unit 100 may be a controller including a CPU, ROM, RAM, and the like. In this case, the CPU may expand the ROM program into the RAM and execute the program to realize functional blocks such as the local dimming control unit 101, the light emission control unit 102, and the display control unit 103.

The details of the light / dark separation table 400 will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram showing an example of the data structure of the light / dark separation table 400. FIG. 5 is a graph showing the relationship between the area brightness and the BL current defined by the light / dark separation table 400. The light / dark separation table 400 is stored in advance in, for example, the memory of the control unit 100.

As shown in FIG. 4, in the light / dark separation table 400, the bright area BL current (mA) and the dark area BL current (mA) are defined in association with the area brightness (%). The BL current is a current input for causing the light emitting block 121 to emit light, and the larger the current value, the higher the brightness of the light emitting block 121. The area brightness is the brightness of the screen area 111 (that is, the target area) that is the target of display control. An example of calculating the area brightness will be described later.

The bright area BL current is a current value input to the light emitting block 121 that irradiates the target area with light when each pixel 140 is controlled by a dark pixel in the target area. The dark area BL current is a current value input to the light emitting block 121 that irradiates the target area with light when each pixel 140 is controlled by a bright pixel in the target area. In the conventional local dimming, the current input to the light emitting block 121 that is the target of light emission control is used as the reference BL current. The current value of the bright area BL current is set to be equal to or higher than the current value of the reference BL current. The current value of the dark area BL current is set to be equal to or lower than the current value of the reference BL current.

The bright area BL current or the dark area BL current defined by the light / dark separation table 400 will be described more specifically with reference to FIGS. 4 and 5. For two different arbitrary area luminances, the current value of the bright area BL current corresponding to the larger area luminance is greater than or equal to the current value of the bright area BL current corresponding to the smaller area luminance. Similarly, for two different arbitrary area luminances, the current value of the dark area BL current corresponding to the larger area luminance is greater than or equal to the current value of the dark area BL current corresponding to the smaller area luminance. However, under the condition that the area brightness is the same, the current value of the bright area BL current is equal to or higher than the current value of the dark area BL current.

When the display control unit 103 controls the display so that the target area is the darkest, the area brightness of the target area is "0%". The bright area BL current and the dark area BL current corresponding to this area brightness are both the smallest current values (for example, 100 mA). This current value is equal to the reference BL current when the area brightness is "0%". On the contrary, when the display control unit 103 controls the display so that the target area is the brightest, the area brightness of the target area is "100%". The bright area BL current and the dark area BL current corresponding to this area brightness both have the largest current value (for example, 200 mA). This current value is equal to the reference BL current when the area brightness is "100%".

As the gradation value of each pixel 140 included in the target area increases, the area brightness of the target area increases. For example, as the gradation value of each pixel 140 included in the target area increases from low gradation to intermediate gradation, the area brightness of the target area also changes from low brightness (for example, 0%) to medium brightness (for example, 60%). Go up to. In the light-dark separation table 400 of this example, the bright area BL current linearly increases from 100 mA to 200 mA in response to the area brightness increasing from low brightness to medium brightness, while the dark area BL current is constant (100 mA). be. Therefore, as the area brightness increases from low brightness to medium brightness, the BL light-dark current difference increases. The BL light-dark current difference is the difference between the current value of the bright area BL current and the current value of the dark area BL current corresponding to the same area brightness.

As the gradation value of each pixel 140 included in the target area increases from the intermediate gradation to the high gradation, the area brightness of the target area also increases from the medium brightness (for example, 60%) to the high brightness (for example, 100%). In the light-dark separation table 400 of this example, the dark area BL current linearly increases from 100 mA to 200 mA in response to the area brightness increasing from medium brightness to high brightness, while the bright area BL current is constant (200 mA). be. Therefore, as the area brightness increases from medium brightness to high brightness, the BL light-dark current difference becomes smaller.

In the range where the area brightness exceeds 0% and is less than 100%, the bright area BL current becomes larger than the reference BL current, while the dark area BL current becomes smaller than the reference BL current. As shown in FIG. 5, the BL light-dark current difference becomes maximum when the target area has intermediate gradation (in other words, medium brightness) (see current difference D1). The current difference D2 when the target area has low gradation (in other words, low brightness) and the current difference D3 when the target area has high gradation (in other words, high brightness) are both smaller than the current difference D1.

In the light / dark separation table 400 illustrated in FIG. 4, the bright area BL current or the dark area BL current corresponding to the area brightness in units of 10% is defined. The light / dark separation table 400 may determine the bright area BL current or the dark area BL current corresponding to the area brightness in units smaller than 10% (for example, 1% unit).

The display control of the liquid crystal display device 1 will be described with reference to FIGS. 6 to 9. FIG. 6 is a diagram showing an example of the image data 600. FIG. 7A is a diagram for explaining display control of the screen area 111A. FIG. 7B is a diagram for explaining display control of the screen area 111B. FIG. 8A is a diagram showing a driving mode of the panel main body 110 based on the (n) frame in the first embodiment. FIG. 8B is a diagram showing a driving mode of the panel main body 110 based on the (n + 1) frame in the first embodiment. FIG. 9 is a diagram showing a display mode of the panel main body 110 at the time of inputting each frame.

The local dimming control unit 101 calculates the area brightness of each screen area 111 based on the input image data. The local dimming control unit 101 refers to the light / dark separation table 400 to specify the bright area BL current or the dark area BL current corresponding to the calculated area brightness. When the calculated area brightness is not in the light / dark separation table 400, the bright area BL current or the dark area BL current of two points of the calculated area brightness that are close to the calculated area brightness among the plurality of area brightness in the light / dark separation table 400. The bright area BL current or the dark area BL current corresponding to the calculated area brightness may be specified by interpolating. The local dimming control unit 101 outputs BL control data indicating the current value of the specified bright area BL current or dark area BL current to the light emission control unit 102.

As an example, a calculation example of the area brightness of each screen area 111 will be described based on the image data 600 for one frame shown in FIG. The local dimming control unit 101 identifies a plurality of image areas 601 to be displayed on each of the plurality of screen areas 111 from the input image data 600. The local dimming control unit 101 calculates, for example, the area brightness of the screen area 111A (see FIG. 9) in which the image area 601A is displayed as follows.

In the image area 601A, half of it is represented by "white" and the other half is represented by "yellow". When the image data 600 is displayed on the liquid crystal display device 1, the image area 601A is displayed on the screen area 111A. At this time, as shown in FIG. 3, in the display area 131A constituting the screen area 111A, 20 pixels 140 out of 40 pixels 140 display "white", and 20 pixels 140 are "yellow". Is displayed. In the "white" pixel 140, all the sub-pixels R, G, and B are driven to display "white" with 70% brightness. In the "yellow" pixel 140, sub-pixels R and G other than B are driven, and "yellow" is displayed with 50% brightness.

In this case, in the screen area 111A, the number of 70% brightness red sub-pixels R is 20, and the number of 50% brightness red sub-pixels R is 20. The brightness of the R component of the screen area 111A is calculated as follows.
(0.7 × 20) + (0.5 × 20) = 24

In the screen area 111A, the number of 70% brightness green sub-pixels G is 20, and the number of 50% brightness green sub-pixels G is 20. The brightness of the G component of the screen area 111A is calculated as follows.
(0.7 × 20) + (0.5 × 20) = 24

In the screen area 111A, the number of blue sub-pixels B having 70% brightness is 20. The brightness of the B component of the screen area 111A is calculated as follows.
(0.7 × 20) = 14

By applying each brightness of the RGB component of the screen area 111A to the luminosity factor function, the brightness of the RGB component of the screen area 111A is calculated as follows.
R (24 x 1) + G (24 x 4.591) + B (14 x 0.060) = 135.024

The MAX brightness of the screen area 111A is calculated as follows.
R (40 x 1) + G (40 x 4.591) + B (40 x 0.060) = 226.04

By standardizing the brightness of the RGB component of the screen area 111A with the MAX brightness as follows, "60%" can be obtained as the area brightness of the screen area 111A.
135.024 / 226.04 = 0.594 (≈60%)

The local dimming control unit 101 refers to the light / dark separation table 400 to specify the bright area BL current “200 mA” or the dark area BL current “100 mA” corresponding to the area brightness “60%”. The local dimming control unit 101 outputs BL control data indicating the specified bright area BL current or dark area BL current to the light emission control unit 102. The light emission control unit 102 inputs a bright area BL current or a dark area BL current to the light emission block 121A (see FIG. 2) based on the BL control data.

In the present embodiment, each time the image data for each frame is input to the liquid crystal display device 1, the bright area BL current and the dark area BL current corresponding to the area brightness of each screen area 111 are alternately applied to each light emitting block 121. Entered. Specifically, when the image data of the (n) th frame is input, the bright area BL current is input to the first block group, which is half of the plurality of light emitting blocks 121, and the other half of the plurality of light emitting blocks 121. The dark area BL current is input to the second block group. When the image data of the (n + 1) th frame is input, the dark area BL current is input to the first block group, and the bright area BL current is input to the second block group.

In this example, the light emitting block 121A is included in the first block group. Therefore, as shown in FIG. 7A, when the image data of the (n) th frame is input, the bright area BL current is input to the light emitting block 121A. Next, when the image data of the (n + 1) th frame is input, the dark area BL current is input to the light emitting block 121A.

Further, the local dimming control unit 101 calculates the area brightness of the screen area 111B (see FIG. 9) in the same manner as described above, based on, for example, the image area 601B (see FIG. 6) adjacent to the image area 601A. The local dimming control unit 101 refers to the light / dark separation table 400 and outputs BL control data indicating the bright area BL current or the dark area BL current corresponding to the area brightness of the screen area 111B to the light emission control unit 102. The light emission control unit 102 inputs the bright area BL current or the dark area BL current to the light emission block 121B (see FIG. 2) based on the BL control data.

In this example, the light emitting block 121B is included in the second block group. Therefore, as shown in FIG. 7B, when the image data of the (n) th frame is input, the dark area BL current is input to the light emitting block 121B. Next, when the image data of the (n + 1) th frame is input, the bright area BL current is input to the light emitting block 121B.

In the present embodiment, the light emitting blocks 121 constituting the first block group and the light emitting blocks 121 forming the second block group are the same number of each other and are arranged alternately in the matrix direction. Therefore, when the image data of the (n) th frame is input to the liquid crystal display device 1, as shown in FIG. 8A, the light emitting block 121 that is driven by the bright area BL current and the light emitting that is driven by the dark area BL current are emitted. The blocks 121 and the blocks 121 are lined up in the matrix direction. When the image data of the (n + 1) th frame is input to the liquid crystal display device 1, the dark area BL current and the bright area BL current input to each light emitting block 121 are switched as shown in FIG. 8B. After that, the light emission control of the (n) th frame and the light emission control of the (n + 1) th frame are alternately repeated.

The first brightness, which is the brightness of the light emitting block 121 to which the bright area BL current is input, is equal to or higher than the second brightness, which is the brightness of the light emitting block 121 to which the dark area BL current is input. In this example, the average value of the dark area BL current and the bright area BL current is equal to the above-mentioned reference BL current. Therefore, the average value of the first brightness and the second brightness is equal to the target brightness of the backlight 120 based on the reference BL current.

On the other hand, as described above, the local dimming control unit 101 calculates the gradation data of each pixel 140 included in the plurality of display areas 131 and outputs the gradation data to the display control unit 103. For example, the image area 601A (see FIG. 6) included in the image data 600 is displayed in the display area 131A (see FIG. 2) where the light emitting block 121A irradiates light. Therefore, the local dimming control unit 101 calculates the target gradation of each pixel 140 constituting the display area 131A based on the target luminance of the image area 601A and the light emitting block 121A in the same manner as the known local dimming.

Next, the local dimming control unit 101 outputs the gradation data of each pixel 140 to the display control unit 103 based on the calculated target gradation. The gradation data of each pixel 140 indicates a gradation value of a dark pixel lower than the target gradation or a gradation value of a bright pixel higher than the target gradation. In this example, the average gradation of dark pixels and bright pixels is equal to the target gradation. The display control unit 103 drives all the pixels 140 constituting the display area 131A as dark pixels or bright pixels based on the gradation data of each pixel 140. In the following, a plurality of gradation data for controlling a plurality of pixels 140 constituting one display area 131 to dark pixels will be referred to as a dark frame. A plurality of gradation data for controlling a plurality of pixels 140 constituting one display area 131 to bright pixels is referred to as a bright frame.

In the present embodiment, every time the image data in frame units is input to the liquid crystal display device 1, all the pixels 140 constituting each display area 131 are alternately controlled by dark pixels and bright pixels. Specifically, of the plurality of display areas 131, half of the display areas 131 irradiated with light by each light emitting block 121 of the first block group constitute the first area group. Of the plurality of display areas 131, the remaining half of the display areas 131 irradiated with light by each light emitting block 121 of the second block group constitutes the second area group.

(N) When the image data of the frame th is input, each pixel 140 of the first area group is controlled as a dark pixel based on the dark frame, and each pixel 140 of the second area group is controlled as a bright pixel based on the bright frame. Is controlled by. When the image data of the (n + 1) th frame is input, each pixel 140 of the first area group is controlled to a bright pixel based on the bright frame, and each pixel 140 of the second area group is a dark pixel based on the dark frame. Is controlled by.

In this example, the display area 131A is included in the first area group. Therefore, as shown in FIG. 7A, when the image data of the (n) th frame is input, the dark frame is input to the display area 131A, and all the pixels 140 constituting the display area 131A are controlled to the dark pixels. NS. Next, when the image data of the (n + 1) th frame is input, the bright frame is input to the display area 131A, and all the pixels 140 constituting the display area 131A are controlled to the bright pixels.

Further, the image area 601B (see FIG. 6) included in the image data 600 is displayed in the display area 131B (see FIG. 2) where the light emitting block 121B irradiates light. Therefore, the local dimming control unit 101 calculates the target gradation of each pixel 140 constituting the display area 131B, and outputs the gradation data of each pixel 140 included in the display area 131B to the display control unit 103. The display control unit 103 drives all the pixels 140 constituting the display area 131B as dark pixels or bright pixels.

In this example, the display area 131B is included in the second area group. Therefore, as shown in FIG. 7B, when the image data of the (n) th frame is input, the bright frame is input to the display area 131B, and all the pixels 140 constituting the display area 131B are controlled by the bright pixels. NS. Next, when the image data of the (n + 1) th frame is input, the dark frame is input to the display area 131B, and all the pixels 140 constituting the display area 131B are controlled by the dark pixels.

In the present embodiment, the display area 131 constituting the first area group and the display area 131 constituting the second area group are arranged in the same number as each other and alternately arranged in the matrix direction. Therefore, when the image data of the (n) th frame is input to the liquid crystal display device 1, as shown in FIG. 8A, the display area 131 in which each pixel 140 is controlled as a dark pixel and each pixel 140 becomes a bright pixel. The controlled display areas 131 are arranged in the matrix direction. When the image data of the (n + 1) th frame is input to the liquid crystal display device 1, each pixel 140 is switched between a dark pixel and a bright pixel, as shown in FIG. 8B. After that, the liquid crystal drive of the (n) th frame and the liquid crystal drive of the (n + 1) th frame are alternately repeated.

With the above control, as shown in FIGS. 8A and 8B, each display area 131 in which the dark frame is input (that is, each pixel 140 controlled by the dark pixel) emits light in which the bright area BL current is input. Light is emitted by the block 121. As a result, in the screen area 111 of dark pixels having a relatively low light transmittance, the image area 601 is displayed with the same brightness as the target gradation of each pixel 140 by the light emitting block 121 having a relatively high brightness.

On the other hand, each display area 131 to which the bright frame is input (that is, each pixel 140 controlled by the bright pixel) is irradiated with light by each light emitting block 121 to which the dark area BL current is input. As a result, in the screen area 111 of bright pixels having a relatively high light transmittance, the image area 601 is displayed with the same brightness as the target gradation of each pixel 140 by the light emitting block 121 having a relatively low brightness. As a result, as shown in FIG. 9, in the panel main body 110 composed of the plurality of screen areas 111, the image data 600 is displayed with the same brightness as the target gradation of each pixel 140.

In the first embodiment described above, the light emission control unit 102 causes the target block to emit light at the first luminance and the target pixel is switched to the dark pixel when the target pixel is switched to the bright pixel. At the same time, the target block is made to emit light at the second brightness. The light emission control unit 102 controls the current value supplied at the time of light emission of the target block according to the brightness of the target area including the target pixel among the plurality of display areas 131, thereby determining the first brightness and the second brightness. Change the brightness difference. The display control unit 103 adjusts the light transmittance of the target pixel so that the target pixel that can be switched to either the bright pixel or the dark pixel has the target gradation.

As a result, by controlling each pixel 140 alternately as a bright pixel and a dark pixel, it is possible to suppress that each pixel 140 is displayed in an intermediate gradation, so that the viewing angle characteristic of the panel body 110 from an oblique direction is improved. It will be improved. Further, by the above-mentioned local dimming control, a high-contrast image can be displayed on the panel main body 110. Further, regardless of whether the screen area 111 is controlled by dark pixels or bright pixels, the brightness of the image displayed in the screen area 111 is the same as the target gradation of each pixel 140. Therefore, it is possible to suppress the occurrence of a flicker feeling due to the switching between the bright pixels and the dark pixels in the image displayed on the panel main body 110.

In the above embodiment, the case where the dark area BL current and the bright area BL current are determined by using the light / dark separation table 400 is illustrated, but it may be determined by another method. An example of determining the dark area BL current and the bright area BL current using the light / dark separation table 1000 will be described with reference to FIGS. 10 and 11. FIG. 10 is a diagram showing an example of the data structure of the light / dark separation table 1000. FIG. 11 is a graph showing the relationship between the area brightness and the BL current defined by the light / dark separation table 1000. The light / dark separation table 1000 is stored in advance in, for example, the memory of the control unit 100.

As shown in FIG. 10, in the light / dark separation table 1000, the BL light / dark current difference (mA) is determined in association with the area brightness (%) of the screen area 111. In the light / dark separation table 1000 illustrated in FIG. 10, the BL light / dark current difference corresponding to the area brightness in units of 20% is defined, but the area in units smaller than 20% (for example, 10% unit, 1% unit, etc.) The BL light / dark current difference corresponding to the brightness may be determined.

In the light / dark separation table 1000, when the area brightness of the target area is the minimum value (0%) or the maximum value (100%), the BL light / dark current difference becomes the minimum value (0 mA). When the area brightness of the target area is medium brightness (60%), the BL light / dark current difference becomes the maximum value (200 mA). The BL light-dark current difference increases from 0 mA to 200 mA in response to the area brightness increasing from low brightness to medium brightness, while the BL light-dark current difference increases from 200 mA in response to the area brightness increasing from medium brightness to high brightness. It decreases to 0mA.

As shown in FIG. 11, the BL light-dark current difference defined by the light-dark separation table 1000 becomes maximum when the target area has intermediate gradation (in other words, medium brightness), as in the light-dark separation table 400 (current difference D1). See). The current difference D2 when the target area has low gradation (in other words, low brightness) and the current difference D3 when the target area has high gradation (in other words, high brightness) are both smaller than the current difference D1. ..

The local dimming control unit 101 refers to the light / dark separation table 1000 to specify the BL light / dark current difference corresponding to the area brightness of the target area. When the area brightness of the target area is not in the light / dark separation table 1000, the BL light / dark current difference may be calculated by the above-mentioned interpolation processing. The local dimming control unit 101 calculates the reference BL current in the same manner as the conventional local dimming. The local dimming control unit 101 can specify the bright area BL current by adding 1/2 of the BL light / dark current difference to the reference BL current, or subtracts 1/2 of the BL light / dark current difference from the reference BL current to specify the dark area. BL current can be specified. Other processes are the same as those in the above embodiment.

In the above embodiment, the light emission control unit 102 illustrates the case where the brightness of the backlight 120 is controlled by the BL current, but the brightness of the backlight 120 may be controlled by another method. The light emission control unit 102 may control the brightness of the backlight 120 by, for example, pulse width modulation (PWM). In this case, in the known local dimming, the duty ratio for causing the light emitting block 121 to emit light at the target brightness is set as the reference duty ratio. The bright area BL duty ratio and the dark area BL duty ratio may be stored in advance in the light / dark separation table 400 based on the reference duty ratio. The bright area BL duty ratio is a duty ratio for controlling light emission of the light emitting block 121 that irradiates the screen area 111 of the dark pixel with light, and is higher than the reference duty ratio. The dark area BL duty ratio is a duty ratio for controlling light emission of the light emitting block 121 that irradiates the screen area 111 of the bright pixel with light, and is lower than the reference duty ratio. Instead of this, the difference between the bright area BL duty ratio and the dark area BL duty ratio may be stored in advance in the light / dark separation table 1000. As a result, similarly to the above embodiment, the light emission control unit 102 can control the brightness of the light emission block 121 by the duty ratio according to the dark pixel or the bright pixel.

(Second Embodiment)
A second embodiment of the present disclosure will be described. FIG. 12A is a diagram showing a driving mode of the panel main body 110 based on the (n) frame in the second embodiment. FIG. 12B is a diagram showing a driving mode of the panel main body 110 based on the (n + 1) frame in the second embodiment.

As shown in FIGS. 12A and 12B, in the liquid crystal display device 1 of the second embodiment, the entire liquid crystal panel 130 is one display area 131. The entire surface of the backlight 120 is one light emitting block 121 that irradiates the display area 131 with light. Therefore, the panel body 110 includes only one screen area 111. The control unit 100 performs the same display control as in FIG. 7A every time the image data in frame units is input to the liquid crystal display device 1.

As a result, when the image data of the (n) th frame is input, the bright area BL current is input to the light emitting block 121 (the entire surface of the backlight 120), and the dark frame is input to the display area 131 (the entire liquid crystal panel 130). Is entered. As shown in FIG. 12A, the entire surface of the backlight 120 emits light uniformly at the second luminance, and all the pixels 140 included in the liquid crystal panel 130 are controlled to dark pixels.

Next, when the image data of the (n + 1) th frame is input, the dark area BL current is input to the light emitting block 121 (the entire surface of the backlight 120), and the bright frame is displayed in the display area 131 (the entire liquid crystal panel 130). Entered. As shown in FIG. 12B, the entire surface of the backlight 120 emits light uniformly at the first luminance, and all the pixels 140 included in the liquid crystal panel 130 are controlled to bright pixels. After that, the display control of the (n) th frame and the display control of the (n + 1) th frame are alternately repeated.

In the second embodiment described above, the display control unit 103 alternately switches all of the plurality of pixels 140 between bright pixels and dark pixels. The light emission control unit 102 causes all of the plurality of light emitting blocks 121 to emit light at the first luminance and all of the plurality of pixels 140 are converted to dark pixels so that all of the plurality of pixels 140 are switched to bright pixels. All of the plurality of light emitting blocks 121 are made to emit light at the second brightness as the switching is performed.

According to this, as in the first embodiment, regardless of which frame the image data is input, the image data is displayed on the panel main body 110 with the same brightness as the target gradation of each pixel 140. Therefore, with simpler display control, it is possible to suppress the feeling of flicker as in the first embodiment. Further, since the image data for one frame is displayed only with dark pixels or only bright pixels instead of a combination of dark pixels and bright pixels, deterioration of the resolution of the image displayed on the panel main body 110 can be suppressed. ..

(Third Embodiment)
A third embodiment of the present disclosure will be described. FIG. 13A is a diagram showing a driving mode of the panel main body 110 based on the (n) frame in the third embodiment. FIG. 13B is a diagram showing a driving mode of the panel main body 110 based on the (n + 1) frame in the third embodiment.

As shown in FIGS. 13A and 13B, in the liquid crystal display device 1 of the third embodiment, each of the plurality of pixels 140 included in the liquid crystal panel 130 is one display area 131. The backlight 120 of the present embodiment can control light emission in pixel units by applying technologies such as a mini LED backlight and dual cells. The backlight 120 has a plurality of light emitting blocks 121 that irradiate light toward the plurality of pixels 140 (that is, the plurality of display areas 131). Therefore, the panel body 110 includes the same number of screen areas 111 as the plurality of pixels 140.

Similar to the first embodiment, the control unit 100 requests each light emitting block 121 of the first block group and each display area 131 of the first area group each time image data in frame units is input to the liquid crystal display device 1. , The same display control as in FIG. 7A is performed. At the same time, the control unit 100 performs the same display control as in FIG. 7B for each light emitting block 121 of the second block group and each display area 131 of the second area group. In the pixel 140 to which the dark frame is input, the plurality of sub-pixels (in this example, the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B) are all controlled as dark pixels. In the pixel 140 to which the bright frame is input, all of the plurality of sub-pixels are controlled to bright pixels.

In the present embodiment, the plurality of pixels 140 included in the first area group and the plurality of pixels 140 included in the second area group are the same number of each other and are arranged alternately in the matrix direction. Therefore, when the image data of the (n) th frame is input, as shown in FIG. 13A, a plurality of bright pixels and a plurality of dark pixels are alternately arranged in the matrix direction, and the light emitting block 121 having the first luminance and the light emitting block 121 The light emitting blocks 121 of the second brightness are arranged alternately in the matrix direction. Next, when the image data of the (n + 1) th frame is input, as shown in FIG. 13B, each pixel 140 is switched between the dark pixel and the bright pixel, and each light emitting block 121 has the first luminance and the first luminance. It can be switched between two brightness. After that, the display control of the (n) th frame and the display control of the (n + 1) th frame are alternately repeated.

In the third embodiment described above, the plurality of display areas 131 include any one of the plurality of pixels 140, respectively. The display control unit 103 switches the plurality of first pixels, which is half of the plurality of pixels 140, from the dark pixels to the bright pixels, and switches the plurality of second pixels, which are the rest of the plurality of pixels 140, from the bright pixels to the bright pixels. Switch to dark pixels. The light emission control unit 102 causes half of the plurality of light emitting blocks 121 that irradiate the plurality of first pixels with light to emit light at the first brightness as the plurality of first pixels are switched to bright pixels, and a plurality of light emission control units 102. As the second pixel of the above is switched to a dark pixel, the rest of the plurality of light emitting blocks 121 that irradiate the plurality of second pixels with light is made to emit light with the second brightness.

According to this, as in the first embodiment, regardless of which frame the image data is input, the image data is displayed on the panel main body 110 with the same brightness as the target gradation of each pixel 140. Therefore, as in the first embodiment, it is possible to suppress the feeling of flicker. Further, by performing the above display control for each pixel, which is a small display unit, it is possible to realize more accurate viewing angle correction, higher contrast, suppression of flicker feeling, and the like.

(Fourth Embodiment)
A fourth embodiment of the present disclosure will be described. FIG. 14A is a diagram showing a driving mode of the panel main body 110 based on the (n) frame in the fourth embodiment. FIG. 14B is a diagram showing a driving mode of the panel main body 110 based on the (n + 1) frame in the fourth embodiment.

As shown in FIGS. 14A and 14B, in the liquid crystal display device 1 of the fourth embodiment, a plurality of sub-pixels 141 (in this example, a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel) constituting each pixel 140 are used. Each of B) is one display area 131. The backlight 120 of the present embodiment can control light emission in units of sub-pixels by applying technologies such as a mini LED backlight and dual cells. The backlight 120 has a plurality of light emitting blocks 121 that irradiate light toward a plurality of sub-pixels 141 (that is, a plurality of display areas 131) constituting each pixel 140. Therefore, the panel body 110 includes the same screen area 111 as the total number of sub-pixels 141 included in the plurality of pixels 140.

The control unit 100 performs display control similar to that of the third embodiment. The sub-pixel 141 to which the dark frame is input is independently controlled as a dark pixel. The sub-pixel 141 to which the bright frame is input is independently controlled by the bright pixel. In the present embodiment, the plurality of sub-pixels 141 included in the first area group and the plurality of sub-pixels 141 included in the second area group are the same number of each other and are arranged alternately in the matrix direction. Further, in a pixel array in which a plurality of pixels 140 are arranged in the column direction, a plurality of sub-pixels 141 corresponding to the same color component are arranged in succession.

Therefore, when the image data of the (n) th frame is input, as shown in FIG. 14A, a plurality of bright pixels and a plurality of dark pixels are alternately arranged in the matrix direction, and the light emitting block 121 having the first luminance and the light emitting block 121 The light emitting blocks 121 of the second brightness are arranged alternately in the matrix direction. Next, when the image data of the (n + 1) th frame is input, as shown in FIG. 14B, each sub-pixel 141 is switched between the dark pixel and the bright pixel, and each light emitting block 121 has the first luminance. It can be switched between with the second brightness. After that, the display control of the (n) th frame and the display control of the (n + 1) th frame are alternately repeated.

According to the fourth embodiment, as in the third embodiment, regardless of which frame the image data is input, the image data is displayed on the panel body 110 with the same brightness as the target gradation of each pixel 140. Will be done. Therefore, as in the first embodiment, it is possible to suppress the feeling of flicker. Further, by performing the above display control for each sub-pixel, which is a small display unit, it is possible to realize more accurate viewing angle correction, high contrast, suppression of flicker feeling, and the like.

(remarks)
The present disclosure is not limited to the above embodiment, and is replaced with a configuration that is substantially the same as the configuration shown in the above embodiment, a configuration that exhibits the same action and effect, or a configuration that can achieve the same purpose. You may.

As illustrated in FIGS. 15 to 18, the arrangement patterns of the first block group and the second block group, and the corresponding first area group and second area group are not limited to the above-described embodiment. FIG. 15 is a diagram showing a driving mode of the panel main body 110 in the first modification. FIG. 16 is a diagram showing a driving mode of the panel main body 110 in the second modification. FIG. 17 is a diagram showing a driving mode of the panel main body 110 in the third modification. FIG. 18 is a diagram showing a driving mode of the panel main body 110 in the fourth modification.

The liquid crystal display device 1 of the first modification will be described with reference to FIG. In the first embodiment, a case where the first block group and the second block group are configured so that two adjacent light emitting blocks 121 are controlled to emit light by a combination of the first brightness and the second brightness is illustrated. Instead, as illustrated in FIG. 15, a plurality of adjacent light emitting blocks 121 may form one light emitting group 122. In this case, it is preferable that the first block group and the second block group are configured so that the two adjacent light emitting groups 122 are controlled to emit light by the combination of the first luminance and the second luminance.

As shown in FIG. 15, in the backlight 120 of the first modification, a total of four light emitting blocks 121 arranged two by two in the matrix direction form one light emitting group 122. The plurality of light emitting groups 122 are arranged side by side in the matrix direction by the backlight 120. In each light emitting group 122, the bright area BL current is simultaneously input to the four light emitting blocks 121, or the dark area BL current is simultaneously input to the four light emitting blocks 121.

In this example, the light emitting group 122 included in the first block group and the light emitting group 122 included in the second block group are the same number of each other and are arranged alternately in the matrix direction. Two light emitting groups 122 adjacent to each other in the row direction or the column direction form one light emitting unit 123. In each light emitting unit 123, the number of light emitting blocks 121 to which the bright area BL current is input and the number of light emitting blocks 121 to which the dark area BL current is input are the same in the display control of each frame.

In the liquid crystal panel 130 of the first modification, a total of four display areas 131 arranged two by two in the matrix direction form one display group 132. The plurality of display groups 132 are arranged side by side in the matrix direction on the liquid crystal panel 130 in a one-to-one correspondence with the plurality of light emitting groups 122. In each display group 132, a dark frame is input to the four display areas 131 at the same time, or a bright frame is input to the four display areas 131 at the same time.

In this example, the display group 132 included in the first area group and the display group 132 included in the second area group are the same number of each other and are arranged alternately in the matrix direction. The two display groups 132 adjacent to each other in the row direction or the column direction constitute one display unit 133. In each display unit 133, in the display control of each frame, the quantity of the display area 131 in which the dark frame is input (that is, the quantity of dark pixels) and the quantity of the display area 131 in which the bright frame is input (that is, the quantity of bright pixels) ) Is the same. Therefore, as in the first embodiment, it is possible to suppress the feeling of flicker.

The liquid crystal display device 1 of the second to fourth modified examples will be described with reference to FIGS. 16 to 18. In the third embodiment, a case where two adjacent pixels 140 are controlled to emit light by a combination of a dark pixel and a bright pixel is illustrated. In the fourth embodiment, a case where two adjacent sub-pixels 141 are controlled to emit light by a combination of a dark pixel and a bright pixel is illustrated. Alternatively, as illustrated in FIGS. 16-18, a plurality of adjacent pixels 140 (or sub-pixels 141) may be controlled by a plurality of dark pixels or a plurality of bright pixels. In the second to fourth modified examples, the case where the liquid crystal display device 1 controls the display in units of sub-pixels is illustrated, but the same applies to the case where the display is controlled in units of pixels.

In the second modification shown in FIG. 16, a plurality of light emitting blocks 121 arranged in the row direction form one light emitting row. In the backlight 120, a plurality of light emitting columns are arranged side by side in the row direction. In this example, the light emitting columns included in the first block group and the light emitting columns included in the second block group are arranged one by one alternately along the row direction. Correspondingly, the sub-pixels 141 of the first area group and the sub-pixels 141 of the second area group are alternately arranged in a row along the row direction. In the display control of each frame, the plurality of sub-pixels 141 arranged in the row direction on the liquid crystal panel 130 are controlled so that the dark pixels and the bright pixels are arranged alternately one by one.

Two pixels 140 adjacent to each other in the row direction constitute one display unit 133. In each display unit 133, the number of sub-pixels 141 controlled by bright pixels and the number of sub-pixels 141 controlled by dark pixels are the same in the display control of each frame. In the example of FIG. 16, of the six sub-pixels 141 included in each display unit 133 (two pixels 140), three are controlled to bright pixels and three are controlled to dark pixels. As described above, in the second modification, the plurality of sub-pixels 141 arranged in the column direction are simultaneously controlled as bright pixels (or dark pixels), while the number of bright pixels and dark pixels of each display unit 133 is the same. Therefore, as in the first embodiment, it is possible to suppress the feeling of flicker.

In the third modification shown in FIG. 17, a total of four light emitting blocks 121 arranged two by two in the matrix direction form one light emitting group. In the backlight 120, the light emitting group included in the first block group and the light emitting group included in the second block group are arranged alternately in the matrix direction. Correspondingly, a total of four sub-pixels 141 arranged two by two in the matrix direction form one display group. In the liquid crystal panel 130, the display group included in the first area group and the display group included in the second area group are arranged alternately in the matrix direction. In the display control of each frame, the plurality of sub-pixels 141 arranged in the row direction on the liquid crystal panel 130 are controlled so that two dark pixels and two bright pixels are arranged alternately.

The four pixels 140 adjacent to each other in the row direction constitute one display unit 133. In each display unit 133, the number of sub-pixels 141 controlled by bright pixels and the number of sub-pixels 141 controlled by dark pixels are the same in the display control of each frame. In the example of FIG. 17, of the 12 sub-pixels 141 included in each display unit 133 (four pixels 140), six are controlled to bright pixels and six are controlled to dark pixels. As described above, in the third modification, the plurality of sub-pixels 141 arranged in the matrix direction are simultaneously controlled as bright pixels (or dark pixels), while the number of bright pixels and dark pixels of each display unit 133 is the same. Therefore, as in the first embodiment, it is possible to suppress the feeling of flicker.

In the fourth modification shown in FIG. 18, a plurality of light emitting blocks 121 arranged in the row direction form one light emitting row. In the backlight 120, a plurality of light emitting rows are arranged side by side in the column direction. In this example, the light emitting rows included in the first block group and the light emitting rows included in the second block group are alternately arranged one column at a time along the column direction. Correspondingly, the sub-pixels 141 of the first area group and the sub-pixels 141 of the second area group are alternately arranged in a row along the row direction. In the display control of each frame, the plurality of sub-pixels 141 arranged in the column direction on the liquid crystal panel 130 are controlled so that the dark pixels and the bright pixels are arranged alternately one by one.

Two pixels 140 adjacent to each other in the column direction constitute one display unit 133. In each display unit 133, the number of sub-pixels 141 controlled by bright pixels and the number of sub-pixels 141 controlled by dark pixels are the same in the display control of each frame. In the example of FIG. 18, of the six sub-pixels 141 included in each display unit 133 (two pixels 140), three are controlled to bright pixels and three are controlled to dark pixels. As described above, in the fourth modification, the plurality of sub-pixels 141 arranged in the row direction are simultaneously controlled as bright pixels (or dark pixels), while the number of bright pixels and dark pixels of each display unit 133 is the same. Therefore, as in the first embodiment, it is possible to suppress the feeling of flicker.

In the above-described embodiment and modification, each time one frame of image data is input, the light emission control between the first block group and the second block group is switched, and the first area group and the second area group are used. The case of switching the liquid crystal drive of the above was described. Instead of this, each time the image data for a plurality of frames is input, the light emission control of each block group and the liquid crystal drive of each area group may be switched. For example, when switching these display controls each time two frames of image data are input, the following controls may be performed.

First, when the image data of the (n) and (n + 1) th frames are sequentially input, the bright area BL current is input to the first block group, the dark area BL current is input to the second block group, and the first area is input. A dark frame is input to the group, and a light frame is input to the second area group. Next, when the image data of the (n + 2) and (n + 3) frames are sequentially input, the dark area BL current is input to the first block group, the bright area BL current is input to the second block group, and the first area is input. A bright frame is input to the group, and a dark frame is input to the second area group. As a result, it is possible to suppress the feeling of flicker while suppressing the execution frequency of the above switching control.

Further, the designer or the like may set arbitrary values for the area brightness, the bright area BL current, the dark area BL current, the BL light / dark current difference, etc. defined by the light / dark separation tables 400 and 1000. The local dimming control unit 101 may determine the bright area BL current and the dark area BL current without referring to the light / dark separation tables 400 and 1000. For example, the local dimming control unit 101 applies a predetermined mathematical formula (for example, addition or subtraction of a specified value) to the reference BL current regardless of the area brightness, so that the bright area BL current and the dark area BL current are respectively. May be calculated. The average value of the dark area BL current and the bright area BL current does not have to be the same as the reference BL current.

The quantity of the light emitting blocks 121 constituting the first block group may be different from the quantity of the light emitting blocks 121 forming the second block group. Similarly, the quantity of the display area 131 constituting the first area group may be different from the quantity of the display area 131 constituting the second area group.

1 Liquid crystal display device, 102 light emission control unit, 103, display control unit, 120 backlight, 130 liquid crystal panel

Claims (6)

A liquid crystal panel in which a plurality of pixels capable of controlling the light transmittance of the liquid crystal are provided in a matrix, and
A backlight having a plurality of light emitting blocks that irradiate light toward a plurality of display areas in which the liquid crystal panel is divided so as to include at least one of the plurality of pixels.
A display in which a target pixel, which is an arbitrary pixel included in any of the plurality of display areas, is alternately switched between a bright pixel having a relatively high light transmittance and a dark pixel having a relatively low light transmittance. Control unit and
As the target pixel is alternately switched between the bright pixel and the dark pixel, the brightness of the target block that irradiates the target pixel with light among the plurality of light emitting blocks is set to the first brightness and the first brightness. A light emission control unit that alternately switches to a second brightness of one brightness or more,
Liquid crystal display device equipped with. The light emission control unit causes the target block to emit light at the first luminance as the target pixel is switched to the bright pixel, and the target pixel is switched to the dark pixel. The target block is made to emit light at the second brightness.
The liquid crystal display device according to claim 1. The light emission control unit controls the current value supplied at the time of light emission of the target block according to the brightness of the target area including the target pixel among the plurality of display areas, thereby performing the first brightness and the first brightness. Change the brightness difference from the two brightness,
The liquid crystal display device according to claim 1 or 2. The display control unit adjusts the light transmittance of the target pixel so that the target pixel that can be switched to either the bright pixel or the dark pixel has a target gradation.
The liquid crystal display device according to any one of claims 1 to 3. The display control unit alternately switches all of the plurality of pixels between the bright pixels and the dark pixels.
The light emission control unit causes all of the plurality of light emitting blocks to emit light at the first luminance as all of the plurality of pixels are switched to the bright pixels, and all of the plurality of pixels are said to have the same. All of the plurality of light emitting blocks are made to emit light at the second brightness as the pixels are switched to dark pixels.
The liquid crystal display device according to any one of claims 1 to 4. The plurality of display areas include any one of the plurality of pixels, respectively.
The display control unit switches the plurality of first pixels, which is half of the plurality of pixels, from the dark pixels to the bright pixels, and switches the plurality of second pixels, which are the rest of the plurality of pixels, into the bright pixels. To the dark pixel,
The light emission control unit causes half of the plurality of light emitting blocks that irradiate the plurality of first pixels with light at the first brightness as the plurality of first pixels are switched to the bright pixels. In addition, as the plurality of second pixels are switched to the dark pixels, the rest of the plurality of light emitting blocks that irradiate the plurality of second pixels with light is made to emit light at the second brightness.
The liquid crystal display device according to any one of claims 1 to 5.

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