# US 11,308,897 B2 · Display device, display control method and driving device

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- Number: US 11,308,897 B2
- Document ID: US11308897B2
- Status: Granted
- Kind: B2
- Application number: 17/255,989
- Filed: 2020-05-22
- Published: 2021-12-16
- Granted: 2022-04-19
- Earliest claimed: 2019-06-25
- Assignees: BOE MLED Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: BOE MLED Technology Co., Ltd.; BOE Technology Group Co., Ltd.
- Inventors: Tiankuo Shi; Lingyun Shi; Xiaomang Zhang; Xin Duan; Wei Sun; Guofeng Hu; Zhihua Ji; Yanhui Xi; Yan Sun; Bin Dai; Yue Li; Yifan Hou; Yilang Sun; Chuanjun Liu; Xue Dong
- Web page: https://patentgrep.com/patent/US11308897B2

## CPC

- G09G 3/342: {using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines}
- G09G 3/3426: {the different display panel areas being distributed in two dimensions, e.g. matrix}
- G09G 2300/023: Display panel composed of stacked panels
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0242: Compensation of deficiencies in the appearance of colours
- G09G 2320/0646: Modulation of illumination source brightness and image signal correlated to each other
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A display device and a display control method, and the display device includes: a backlight module, a first display panel, and a second display panel, and a processor. The processor is configured to: acquire a pixel grayscale matrix of an image to be displayed; determine desired brightness of each pixel by using a grayscale-brightness curve of the second display panel based on the pixel grayscale matrix; determine set light-emitting brightness of backlight partition according to grayscale information in the pixel grayscale matrix corresponding to the backlight partition; obtain a first corrected brightness of each backlight partition based on light diffusion coefficients of the plurality of backlight partitions; determine a grayscale of pixel unit according to a brightness difference between the first corrected brightness and the desired brightness; obtain a second corrected brightness of the backlight partition.

## Claims

### Claim 1

A display device, comprising:
a backlight module comprising a plurality of backlight partitions;
a first display panel and a second display panel sequentially arranged on a light-emitting side of the backlight module, wherein the second display panel is configured to display images, and the first display panel comprises a plurality of pixel areas corresponding to the plurality of backlight partitions, each pixel area comprises a plurality of pixel units, and each pixel unit corresponds to a plurality of pixels of the second display panel; and
a processor configured to:
acquire a pixel grayscale matrix of an image to be displayed, wherein a plurality of grayscales of the pixel grayscale matrix correspond to the plurality of pixels of the second display panel one-to-one;
determine desired brightness of each of the plurality of pixels by using a grayscale-brightness curve of the second display panel based on the pixel grayscale matrix;
determine set light-emitting brightness of each backlight partition according to grayscale information in the pixel grayscale matrix corresponding to each backlight partition;
correct the set light-emitting brightness of each backlight partition, based on light diffusion coefficients of the plurality of backlight partitions, to obtain a first corrected brightness of each backlight partition;
determine a grayscale of each pixel unit in a corresponding pixel area according to a difference between the first corrected brightness and the desired brightness of each pixel for the corresponding pixel area;
correct the set light-emitting brightness of each backlight partition, based on the light diffusion coefficients of the plurality of the backlight partitions and shielding coefficients of the first display panel, to obtain a second corrected brightness of each backlight partition; and
for each pixel of the second display panel, adjust a grayscale of each pixel of the image to be displayed according to a difference between the second corrected brightness of a corresponding backlight partition and the desired brightness of the pixel, to cause the second display panel to display the image to be displayed in adjusted grayscale.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the processor is further configured to:
reduce a grayscale of each pixel unit in the pixel area in response to the first corrected brightness of the corresponding backlight partition being higher than the desired brightness of the pixels corresponding to the pixel unit.

### Claim 3 (depends on 1)

The display device according to claim 1, wherein the processor is further configured to:
reduce a grayscale of each pixel in response to the second corrected brightness of the corresponding backlight partition being higher than the desired brightness of the pixel.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein the processor is further configured to:
determine the set light-emitting brightness of each backlight partition according to a statistical distribution of grayscales of the plurality of pixels corresponding to each backlight partition, or a maximum value of the grayscales of the plurality of pixels, in the pixel grayscale matrix.

### Claim 5 (depends on 1)

The display device according to claim 1, wherein the processor is further configured to:
for each backlight partition, determine a grayscale of the pixel unit according to a difference between the first corrected brightness and the desired brightness of the pixel for a corresponding pixel unit;
smooth and filter the determined grayscale of the pixel unit;
correct the set light-emitting brightness of each backlight partition, based on the light diffusion coefficients of the plurality of backlight partitions and the shielding coefficients of the first display panel after smoothing and filtering, to obtain a second corrected brightness;
adjust a grayscale of each pixel of the image to be displayed to perform brightness compensation on the image to be displayed, according to a difference between the second corrected brightness of the corresponding backlight partition and the desired brightness of the pixel for the corresponding pixel unit; and
perform color correction on the image to be displayed after brightness compensation.

### Claim 6 (depends on 5)

The display device according to claim 5, wherein the processor is further configured to:
perform uniformly compensation on operating parameters of each backlight partition.

### Claim 7 (depends on 5)

The display device according to claim 5, wherein the processor is further configured to:
perform uniformity compensation on the smoothed and filtered grayscale of the pixel unit.

### Claim 8

A display device, comprising:
a backlight module;
a first display panel and a second display panel displaying colors sequentially arranged on a light-emitting side of the backlight module, wherein the second display panel is configured to display images and the second display panel comprises a plurality of pixels, the plurality of pixels correspond to color sub-pixels of an image to be displayed one-to-one, the first display panel comprises a plurality of pixel units, and a height of each of the plurality of pixel units is same as a height of the pixel, a width of each of the plurality of pixel units is twice a width of the pixel, and pixel units in at least part of rows of the first display panel are shifted by one pixel width relative to pixel units in adjacent rows of the first display panel; and
a processor configured to:
acquire a pixel grayscale matrix of an image to be displayed, wherein elements of the pixel grayscale matrix correspond to the plurality of pixels one-to-one;
determine desired brightness of each of the plurality of pixels based on the pixel grayscale matrix;
determine a grayscale value of each pixel unit to cause grayscale values of adjacent pixel units corresponding to different color sub-pixels of same pixel of the image to be displayed to be different;
correct brightness of each backlight partition based on shielding coefficients of the first display panel after the grayscale is determined, to obtain a third corrected brightness of each backlight partition; and
adjust a grayscale of each pixel according to a difference between the third corrected brightness of corresponding backlight partition and the desired brightness of the pixel.

### Claim 9 (depends on 8)

The display device according to claim 8, wherein pixel units in even-numbered rows of the first display panel are shifted by one pixel width relative to pixel units in odd-numbered rows of the first display panel.

### Claim 10 (depends on 9)

The display device of claim 9, wherein each group of three pixel units adjacent to each other in a “” shape in the first display panel correspond to different color sub-pixel combinations, respectively.

### Claim 11 (depends on 8)

The display device according to claim 8, wherein the processor is further configured to:
smooth and filter the determined grayscale value of the pixel unit;
correct brightness of each backlight partition, based on the shielding coefficients of the first display panel after smoothing and filtering, to obtain a third corrected brightness of each backlight partition;
adjust a grayscale of each pixel according to a difference between the third corrected brightness of the corresponding backlight partition and the desired brightness of the pixel, to compensate brightness of the image to be displayed; and
perform color correction on the image after brightness compensation.

### Claim 12 (depends on 8)

The display device according to claim 8, wherein each backlight partition comprises a direct-type micro light-emitting diode array, and a size of each backlight partition is an integer multiple of a size of the pixel unit; and
wherein the processor is further configured to:
determine set light-emitting brightness of each micro light-emitting diode in each backlight partition according to grayscale information in the pixel grayscale matrix corresponding to each backlight partition;
correct the set light-emitting brightness of each micro light-emitting diode in each backlight partition, based on light diffusion coefficients of micro light-emitting diodes in all backlight partitions, to obtain a first corrected brightness of all backlight partitions; and
for each backlight partition, determine a grayscale of each pixel unit in the pixel area according to a brightness difference between the first corrected brightness and the desired brightness of the pixel for the corresponding pixel area.

### Claim 13 (depends on 1)

A display control method implemented by the display device according to claim 1, comprising, implemented by the processor:
acquiring a pixel grayscale matrix of an image to be displayed, wherein elements of the pixel grayscale matrix correspond to the plurality of pixels one-to-one;
determining desired brightness of each of the plurality of pixels based on the pixel grayscale matrix;
determining set light-emitting brightness of each backlight partition according to grayscale information in the pixel grayscale matrix corresponding to each backlight partition;
correcting the set light-emitting brightness of each backlight partition, based on light diffusion coefficients of the plurality of backlight partitions, to obtain a first corrected brightness of each backlight partition;
determining a grayscale of each pixel unit in the pixel area according to a difference between the first corrected brightness and the desired brightness of a pixel for corresponding pixel area;
correcting the set brightness of each backlight partition, based on light diffusion coefficients of the plurality of backlight partitions and shielding coefficients of the first display panel, to obtain a second corrected brightness of each backlight partition, wherein the shielding coefficients of the first display panel are determined by using a grayscale of each pixel unit; and
adjusting a grayscale of each pixel of the second display panel according to a brightness difference between the second corrected brightness of a corresponding backlight partition and the desired brightness of each pixel of the second display panel.

### Claim 14 (depends on 8)

A display control method implemented by the display device according to claim 8, comprising, implemented by the processor:
acquiring a pixel grayscale matrix of an image to be displayed, wherein elements of the pixel grayscale matrix correspond to the plurality of pixels one-to-one;
determining desired brightness of each pixel unit based on the pixel grayscale matrix;
determining a grayscale value of each pixel unit to cause grayscale values of adjacent pixel units corresponding to different color sub-pixels of same pixel of the image to be displayed to be different;
correcting brightness of the backlight partition, based on shielding coefficients of the first display panel after the grayscale is determined, to obtain a third corrected brightness of each backlight partition; and
adjusting a grayscale of each pixel according to a difference between the third corrected brightness of corresponding backlight partition and the desired brightness of the pixel.

### Claim 15 (depends on 13)

A driving device, comprising:
a memory configured to store instructions; and
at least one processor;
wherein the at least one processor executes instructions stored in the memory to implement the method according to claim 13.

### Claim 16 (depends on 13)

A non-transitory computer-readable storage medium storing instructions configured to implement the method according to claim 13 when executed by at least one processor.

### Claim 17 (depends on 14)

A driving device, comprising:
a memory configured to store instructions; and
at least one processor;
wherein the at least one processor executes instructions stored in the memory to implement the method according to claim 14.

### Claim 18 (depends on 14)

A non-transitory computer-readable storage medium storing instructions configured to implement the method according to claim 14 when executed by at least one processor.