# US 11,308,896 B2 · Liquid crystal display device and control method thereof, head-mounted display apparatus and medium

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- Number: US 11,308,896 B2
- Document ID: US11308896B2
- Status: Granted
- Kind: B2
- Application number: 16/611,800
- Filed: 2019-02-22
- Published: 2021-10-28
- Granted: 2022-04-19
- Earliest claimed: 2018-05-17
- 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; Zhihua Ji; Xiaomang Zhang; Lingyun Shi; Xiurong Wang; Hao Zhang; Lili Chen; Yilang Sun; Yifang Chu; Yanhui Xi; Wenyu Li; Ming Chen
- Web page: https://patentgrep.com/patent/US11308896B2

## CPC

- G09G 3/3426: {the different display panel areas being distributed in two dimensions, e.g. matrix}
- G09G 3/36: using liquid crystals
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0238: Improving the black level
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G09G 2320/062: Adjustment of illumination source parameters
- G09G 2320/0646: Modulation of illumination source brightness and image signal correlated to each other
- G09G 2320/0686: with two or more screen areas displaying information with different brightness or colours
- 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

The embodiments of this disclosure disclose a liquid crystal display device and a control method thereof, a head-mounted display device and a computer-readable storage medium. The control method of the liquid crystal display device comprises: obtaining a state of each pixel in the display panel based on inputted image data; obtaining a display zone comprising both pixels in a bright state and pixels in a dark state based on the state of each pixel in the display panel, and using the obtained display zone as a destination zone; obtaining a halo region based on the state of the pixels in the destination zone, wherein the halo region comprises pixels in the dark state in the destination zone; generating a first control signal based on the halo region; and controlling based on the first control signal a backlight zone to be adjusted.

## Claims

### Claim 1

A method for controlling a liquid crystal display device, the liquid crystal display device comprising a display panel and a backlight device, the backlight device comprising at least one backlight zone, the display panel comprising at least one display zone, the backlight zone and the display zone corresponding to each other, the method comprising:
obtaining a state of each pixel in the display panel based on inputted image data, the state of the pixel comprising a bright state or a dark state, wherein obtaining a state of each pixel in the display panel based on inputted image data comprises: obtaining a brightness value of each pixel in the display panel based on inputted image data; and determining a state of each pixel based on the brightness value of each pixel and a threshold brightness, and determining that the pixel is in the bright state when the brightness value of the pixel is greater than or equal to the threshold brightness; and determining that the pixel is in the dark state when the brightness value of the pixel is smaller than the threshold brightness;
obtaining a display zone comprising both pixels in the bright state and pixels in the dark state based on the state of each pixel in the display panel, and using the obtained display zone as a destination zone;
obtaining a halo region based on the state of the pixels in the destination zone, wherein the halo region is a region comprising pixels in the dark state in the destination zone;
generating a first control signal based on the halo region; and
controlling based on the first control signal a backlight zone to be adjusted, wherein the backlight zone adjacent to a destination backlight zone is determined as the backlight zone to be adjusted, and the destination backlight zone and the destination zone correspond to each other.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising:
obtaining based on the state of each pixel in the display panel a display zone in which the pixels are all in the dark state;
determining whether a display zone adjacent to the display zone comprises the destination zone;
if the display zone adjacent to the display zone comprises the destination zone, determining that a backlight zone corresponding to the display zone in which the pixels are all in the dark state is the backlight zone to be adjusted;
if the display zone adjacent to the display zone does not comprise the destination zone, determining that a backlight zone corresponding to the display zone in which the pixels are all in the dark state is not the backlight zone to be adjusted.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising:
obtaining based on the state of each pixel in the display panel a display zone in which the pixels are all in the bright state; and
determining that a backlight zone corresponding to the display zone is not the backlight zone to be adjusted.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising:
generating a second control signal based on the halo region; and
controlling based on the second control signal a display zone corresponding to the backlight zone to be adjusted.

### Claim 5 (depends on 4)

The method according to claim 4, wherein controlling based on the second control signal a display zone corresponding to the backlight zone to be adjusted comprises:
controlling the pixels in the display zone corresponding to the backlight zone to be adjusted to be switched on or off.

### Claim 6 (depends on 5)

The method according to claim 5, wherein controlling the pixels in the display zone corresponding to the backlight zone to be adjusted to be switched on or off comprises:
switching on more pixels in the display zone close to the destination zone; and
switching off more pixels in the display zone remote from the destination zone.

### Claim 7 (depends on 1)

The method according to claim 1, wherein generating a first control signal based on the halo region comprises:
determining whether an area of the halo region is equal to a threshold area, and generating a first control signal when the area of the halo region is not equal to the threshold area.

### Claim 8 (depends on 1)

The method according to claim 1, wherein prior to obtaining a state of each pixel in the display panel based on inputted image data, the method further comprises:
obtaining and storing inputted image data.

### Claim 9

A liquid crystal display device, comprising:
a display panel comprising at least one display zone;
a backlight device comprising at least one backlight zone, wherein the backlight zone and the display zone correspond to each other;
a processing circuit configured to obtain a state of each pixel in the display panel based on inputted image data, the state of the pixel comprising a bright state or a dark state, obtaining a display zone comprising both pixels in the bright state and pixels in the dark state based on the state of each pixel in the display panel, using the obtained display zone as a destination zone, obtaining a halo region based on the state of the pixels in the destination zone, and generating a first control signal based on the halo region, wherein the halo region comprises pixels in the dark state in the destination zone; and
a first driving circuit connected with the processing circuit and the backlight device and configured to control based on the first control signal a backlight zone to be adjusted, wherein the backlight zone adjacent to a destination backlight zone is determined as the backlight zone to be adjusted, and the destination backlight zone and the destination zone correspond to each other,
wherein the processing circuit is further configured to:
obtain a brightness value of each pixel in the display panel based on inputted image data; and
determine a state of each pixel based on the brightness value of each pixel and a threshold brightness, and determine that the pixel is in the bright state when the brightness value of the pixel is greater than or equal to the threshold brightness; and determine that the pixel is in the dark state when the brightness value of the pixel is smaller than the threshold brightness.

### Claim 10 (depends on 9)

The liquid crystal display device according to claim 9, wherein the processing circuit is further configured to: obtain based on the state of each pixel in the display panel a display zone in which the pixels are all in the dark state; determining whether a display zone adjacent to the display zone comprises the destination zone; if the display zone adjacent to the display zone comprises the destination zone, determining that a backlight zone corresponding to the display zone in which the pixels are all in the dark state is the backlight zone to be adjusted; if the display zone adjacent to the display zone does not comprise the destination zone, determining that a backlight zone corresponding to the display zone in which the pixels are all in the dark state is not the backlight zone to be adjusted.

### Claim 11 (depends on 9)

The liquid crystal display device according to claim 9, wherein the processing circuit is further configured to: obtain based on the state of each pixel in the display panel a display zone in which the pixels are all in the bright state; and determining that a backlight zone corresponding to the display zone is not the backlight zone to be adjusted.

### Claim 12 (depends on 9)

The liquid crystal display device according to claim 9, wherein the processing circuit is further configured to: generate a second control signal based on the halo region; and wherein the device further comprises: a second driving circuit connected with the processing circuit and the display panel and configured to control based on the second control signal a display zone corresponding to the backlight zone to be adjusted.

### Claim 13 (depends on 9)

The liquid crystal display device according to claim 9, wherein the processing circuit is further configured to:
obtain the halo region based on the pixels in the dark state in the destination zone; and
determine whether an area of the halo region is equal to a threshold area, and generate the first control signal when the area of the halo region is not equal to the threshold area.

### Claim 14 (depends on 9)

The liquid crystal display device according to claim 9, further comprising:
an obtaining circuit connected with the processing circuit and configured to obtain inputted image data; and
a storage circuit connected with the obtaining circuit and configured to store the obtained inputted image data.

### Claim 15 (depends on 9)

A head-mounted display device comprising the liquid crystal display device according to claim 9.

### Claim 16 (depends on 1)

A computer-readable storage medium that stores a computer program capable of running on a processor, which when running on the processor, executes steps of the method for controlling the liquid crystal display device according to claim 1.