# US 12,118,914 B2 · Display control method and display device

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- Number: US 12,118,914 B2
- Document ID: US12118914B2
- Status: Granted
- Kind: B2
- Application number: 18/498,009
- Filed: 2023-10-30
- Published: 2024-07-04
- Granted: 2024-10-15
- Earliest claimed: 2022-12-31
- Assignees: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Applicants: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Zeng Huang
- Web page: https://patentgrep.com/patent/US12118914B2

## CPC

- G09G 3/2007: {Display of intermediate tones}
- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 3/36: using liquid crystals
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G09G 2320/0626: for control of overall brightness
- G09G 2340/0435: Change or adaptation of the frame rate of the video stream
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- G09G 2360/18: Use of a frame buffer in a display terminal, inclusive of the display panel
- 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 control method determines whether a low frame rate compensation function is in an on state when a frame rate of a current frame rendered by a graphics processor is smaller than a minimum refresh rate of a display panel, performs grayscale compensation on at least one frame of display picture in consecutive n frames of display pictures of the display panel when the low frame rate compensation function is in the on state, and controls the display panel to display the compensated consecutive n frames of display pictures.

## Claims

### Claim 1

A display device, comprising:
a display panel configured to display a picture; and
a control module configured to:
in response to a frame rate of a current frame rendered by a graphics processor being smaller than a minimum refresh rate of the display panel, determining whether a low frame rate compensation function of the display panel is in an on state; and
in response to determining that the low frame rate compensation function of the display panel is in the on state, performing grayscale compensation on at least one frame of display picture in consecutive n frames of display pictures of the display panel to control the display panel to display the compensated consecutive n frames of display pictures, wherein the consecutive n frames of display pictures comprise a current frame of display picture corresponding to the current frame, the consecutive n frames of display pictures have the same grayscales, and n is an integer greater than 1.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the control module comprises:
a controller, comprising a frame buffer configured to obtain the frame rate of the current frame.

### Claim 3

A display control method for controlling a display picture of a display panel, comprising:
in response to a frame rate of a current frame rendered by a graphics processor being smaller than a minimum refresh rate of the display panel, determining whether a low frame rate compensation function of the display panel is in an on state;
in response to determining that the low frame rate compensation function of the display panel is in the on state, performing grayscale compensation on at least one frame of display picture in consecutive n frames of display pictures of the display panel, wherein the consecutive n frames of display pictures comprise a current frame of display picture corresponding to the current frame, the consecutive n frames of display pictures have the same grayscales, and n is an integer greater than 1; and
controlling the display panel to display the compensated consecutive n frames of display pictures.

### Claim 4 (depends on 3)

The display control method according to claim 3, wherein the determining whether the low frame rate compensation function of the display panel is in the on state comprises:
determining, based on a first frame rate corresponding to a previous frame rendered by the graphics processor and the frame rate corresponding to the current frame, whether the low frame rate compensation function of the display panel is in the on state.

### Claim 5 (depends on 4)

The display control method according to claim 4, wherein the determining, based on the first frame rate corresponding to the previous frame rendered by the graphics processor and the frame rate corresponding to the current frame, whether the low frame rate compensation function of the display panel is in the on state comprises:
determining whether a difference between a product of the first frame rate and a frame rate multiplication value and the frame rate corresponding to the current frame exceeds a first preset range, wherein the frame rate multiplication value is n; and
in response to determining that the difference is in the first preset range, determining that the low frame rate compensation function of the display panel is in the on state.

### Claim 6 (depends on 3)

The display control method according to claim 3, wherein the consecutive n frames of display pictures further comprise a first frame of display picture after the current frame of display picture, and a second frame of display picture after the first frame of display picture;
wherein the performing of grayscale compensation on the at least one frame of display picture comprises:
in response to determining that the low frame rate compensation function is in the on state, selecting a first compensation value and a second compensation value both corresponding to the frame rate of the current frame from a compensation table including correspondences between preset frame rates and compensation values, wherein the first compensation value and the second compensation value are not equal to each other; and
compensating for a grayscale corresponding to the first frame of display picture based on the first compensation value, and compensating for a grayscale corresponding to the second frame of display picture based on the second compensation value, to reduce a difference between a brightness attenuation curve corresponding to all of the current frame of display picture, the first frame of display picture, and the second frame of display picture and a preset brightness attenuation curve corresponding to the consecutive n frames of display pictures in response to the low frame rate compensation function of the display panel being in the on state.

### Claim 7 (depends on 6)

The display control method according to claim 6, wherein the compensating for a grayscale corresponding to the first frame of display picture based on the first compensation value, and compensating for a grayscale corresponding to the second frame of display picture based on the second compensation value comprises:
obtaining a first compensation grayscale based on a product of a first original grayscale corresponding to the first frame of display picture and the first compensation value, to enable the first original grayscale corresponding to the first frame of display picture to be the first compensation grayscale; and
obtaining a second compensation grayscale based on a product of a second original grayscale corresponding to the second frame of display picture and the second compensation value, to enable the second original grayscale corresponding to the second frame of display picture to be the second compensation grayscale.

### Claim 8 (depends on 3)

The display control method according to claim 3, wherein the consecutive n frames of display pictures further comprise a first frame of display picture after the current frame of display picture, and a second frame of display picture after the first frame of display picture;
wherein the performing of grayscale compensation on the at least one frame of display picture comprises:
in response to determining that the low frame rate compensation function is in the on state, selecting a compensation value corresponding to the frame rate of the current frame from a compensation table including correspondences between preset frame rates and compensation values; and
compensating for grayscales corresponding to the current frame of display picture, the first frame of display picture and the second frame of display picture based on the compensation value, respectively, to reduce a difference between average brightness corresponding to all of the current frame of display picture, the first frame of display picture, and the second frame of display picture and preset average brightness corresponding to the consecutive n frames of display pictures in response to the low frame rate compensation function of the display panel being in the on state.

### Claim 9 (depends on 8)

The display control method according to claim 8, wherein the compensating for grayscales corresponding to the current frame of display picture, the first frame of display picture and the second frame of display picture based on the compensation value, respectively comprises:
obtaining a third compensation grayscale based on a product of a third original grayscale corresponding to the current frame of display picture and the compensation value, to enable the third original grayscale corresponding to the current frame of display picture to be the third compensation grayscale;
obtaining a fourth compensation grayscale based on a product of a fourth original grayscale corresponding to the first frame of display picture and the compensation value, to enable the fourth original grayscale corresponding to the first frame of display picture to be the fourth compensation grayscale; and
obtaining a fifth compensation grayscale based on a product of a fifth original grayscale corresponding to the second frame of display picture and the compensation value, to enable the fifth original grayscale corresponding to the second frame of display picture to be the fifth compensation grayscale.

### Claim 10 (depends on 3)

The display control method according to claim 3, further comprising: after the controlling of the display panel to display the compensated consecutive n frames of display pictures,
determining whether a difference between a product of the frame rate of the current frame rendered by the graphics processor and n and a frame rate of a previous frame rendered by the graphics processor exceeds a second preset range; and
in response to determining that the difference is in the second preset range, determining that the low frame rate compensation function of the display panel is in an off state to stop compensating for a grayscale corresponding to a display picture of the display panel starting from the current frame.