Display data processing method of display device for determining gray-scale value using noise reduction function, display device, electronic device, and storage medium

Patent metadata

Field	Value
Publication number	US-11710438-B2
Application number	US-202017428846-A
Country	US
Kind code	B2
Filing date	Mar 27, 2020
Priority date	Mar 27, 2020
Publication date	Jul 25, 2023
Grant date	Jul 25, 2023

Abstract

A display data processing method of a display device, a display device, an electronic device, and a storage medium are disclosed. The display data processing method includes: in response to a frequency of the dimming screen being consistent with a frequency of the display screen: determining a first gray-scale value of the first dimming pixel according to a plurality of input gray-scale values in an input image; determining a second gray-scale value of the first dimming pixel according to the first gray-scale value and a noise reduction function, where the noise reduction function is a monotonically increasing function in an interval (0, 1); obtaining a dimming gray-scale value of the first dimming pixel based on the second gray-scale value; and determining a plurality of target gray-scale values corresponding to the plurality of first display pixels according to the plurality of input gray-scale values and the dimming gray-scale value.

First claim

What is claimed is:

1. A display data processing method of a display device, wherein the display device comprises a dimming screen and a display screen, the dimming screen is on a backlight side of the display screen and is configured to perform backlight modulation on the display screen, the dimming screen comprises a plurality of dimming pixels, the plurality of dimming pixels comprise a first dimming pixel, the display screen comprises a plurality of display pixels, the plurality of display pixels comprise a plurality of first display pixels, and the first dimming pixel is configured to provide backlight modulation for the plurality of first display pixels; and
the display data processing method comprises:
in response to a frequency of the dimming screen being consistent with a frequency of the display screen:
determining a first gray-scale value of the first dimming pixel according to a plurality of input gray-scale values, which are in one-to-one correspondence with the plurality of first display pixels, in an input image;
determining a second gray-scale value of the first dimming pixel according to the first gray-scale value of the first dimming pixel and a noise reduction function, wherein the noise reduction function is a monotonically increasing function in an interval (0, 1), and has an intersection point P(x0, y0) with a function y=x where x is in the interval (0, 1), and where x is in an interval (0, x0), a function value of the noise reduction function is less than a function value y of the function y=x;
obtaining a dimming gray-scale value of the first dimming pixel based on the second gray-scale value of the first dimming pixel; and
determining a plurality of target gray-scale values corresponding to the plurality of first display pixels according to the plurality of input gray-scale values and the dimming gray-scale value of the first dimming pixel.

2. The display data processing method according to claim 1 , wherein the noise reduction function comprises:
y sub2 =1/(1+ e {circumflex over ( )}( A−y sub1 *B ))

where A and B are noise reduction parameters and constants, y sub1 represents the first gray-scale value of the first dimming pixel, and y sub2 is the function value of the noise reduction function and represents the second gray-scale value of the first dimming pixel.

3. The display data processing method according to claim 2 , wherein the plurality of dimming pixels are arranged in an array of Q rows and P columns, and the first dimming pixel is arranged in an a-th row and b-th column in the array formed by the plurality of dimming pixels, wherein Q, P, a, and b are positive integers, and 1≤a≤Q, 1≤b≤P;
determining the first gray-scale value of the first dimming pixel according to the plurality of input gray-scale values, which are in one-to-one correspondence with the plurality of first display pixels, in the input image, comprises:
determining a display pixel group corresponding to the first dimming pixel among the plurality of display pixels, wherein the display pixel group comprises the plurality of first display pixels, each of the plurality of first display pixels comprises a plurality of first sub-display pixels, and each of the plurality of input gray-scale values comprises a plurality of sub-input gray-scale values, and the plurality of sub-input gray-scale values are in one-to-one correspondence with the plurality of first sub-display pixels;
determining an input pixel gray-scale value corresponding to each of the plurality of first display pixels according to the plurality of sub-input gray-scale values of an input gray-scale value corresponding to each of the plurality of first display pixels, to obtain a plurality of input pixel gray-scale values corresponding to the plurality of first display pixels; and
determining the first gray-scale value of the first dimming pixel according to the plurality of input pixel gray-scale values corresponding to the plurality of first display pixels.

4. The display data processing method according to claim 3 , wherein the plurality of first display pixels are arranged in an array of nt rows and mt columns, where nt is a positive integer and mt is a positive integer;
the determining the first gray-scale value of the first dimming pixel according to the plurality of input pixel gray-scale values corresponding to the plurality of first display pixels, comprises:
according to the plurality of input pixel gray-scale values corresponding to the plurality of first display pixels, calculating nt row sampling values of the nt rows corresponding to the plurality of first display pixels by a first group of calculation formulas, wherein for a row sampling value of an n-th row in the nt rows, the first group of calculation formulas comprises:
S 1( n )=( NA *max( n )>(2 M −1))?(2 M −1): NA *max( n );

S 2( n )=( NE *mean( n )>(2 M− 1))?(2 M− 1): NE *mean( n );
VL ( n )= KL ( n )*( KA*S 1( n )+(1− KA )* S 2( n ));

where max(n) is a maximum value of input pixel gray-scale values corresponding to first display pixels in the n-th row, mean(n) is an average value of the input pixel gray-scale values corresponding to the first display pixels in the n-th row, n is an integer and 1≤n≤nt, NA=NE=KA=1, KL(n)=0.5 or 0.25, M is a positive integer, S1(n) and S2(n) are results of overflow judgment on NA*max(n) and NE*mean(n), respectively, and VL(n) is the row sampling value of the n-th row;
determining the first gray-scale value of the first dimming pixel as the maximum value of the nt row sampling values corresponding to the plurality of first display pixels.

5. The display data processing method according to claim 3 , wherein the plurality of first display pixels are arranged in an array of nt rows and mt columns, nt is a positive integer and mt is a positive integer; and
the determining the first gray-scale value of the first dimming pixel according to the plurality of input pixel gray-scale values corresponding to the plurality of first display pixels, comprises:
according to the plurality of input pixel gray-scale values corresponding to the plurality of first display pixels, calculating nt row sampling values of the nt rows corresponding to the plurality of first display pixels by a first group of calculation formulas, wherein for a row sampling value of an n-th row in the nt rows, the first group of calculation formulas comprises:
S 1( n )=( NA *max( n )>(2 M −1))?(2 M −1): NA *max( n );

S 2( n )=( NE *mean( n )>(2 M −1))?(2 M −1): NE *mean( n );

VL ( n )= KL ( n )*( KA*S 1( n )+(1− KA )* S 2( n ));

where max(n) is a maximum value of input pixel gray-scale values corresponding to first display pixels in the n-th row, mean(n) is an average value of the input pixel gray-scale values corresponding to the first display pixels in the n-th row, n is an integer and 1≤n≤nt, NA=NE=KA=1, KL(n)=0.5 or 0.25, M is a positive integer, S1(n) and S2(n) are results of overflow judgment on NA*max(n) and NE*mean(n), respectively, and the row sampling value of the n-th row takes high M-bit of VL(n);
calculating nt row correction values of the nt rows by a second calculation formula, wherein for a row correction value of the n-th row, the second calculation formula comprises:
VLX ( n )= KX ( n )*( KA*S 1( n )+(1− KA )* S 2( n )),

where KX(n)=0.5 or 0.25, and the row correction value of the n-th row takes high M-bit data of VLX(n);
according to the nt row sampling values and the nt row correction values, calculating nt row final values of the nt rows by a third calculation formula, wherein for a row final value of the n-th row, the third calculation formula comprises:
VLF ( n )=( VL ( n )« M )+ VLX ( n );

where VLF(n) represents the row final value of the n-th row;
taking maximum

Assignees

• Beijing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Xi Yanhui
• Shi Tiankuo
• Sun Yan
• Zhang Xiaomang
• Hou Yifan
• Duan Xin
• Sun Wei
• Chen Ming
• Chu Yifang
• Shi Lingyun

Classifications

• G09G3/2007 Primary

  Display of intermediate tones · CPC title

• G09G3/3611

  Control of matrices with row and column drivers · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G3/3426 Primary

  the different display panel areas being distributed in two dimensions, e.g. matrix · CPC title

• G09G2300/023

  Display panel composed of stacked panels · CPC title