	US 12,266,320 B2
	Gray scale compensation method and apparatus for display panel
Chunhui Ren, Kunshan (CN); Xiaokang Zhou, Kunshan (CN); and Jinquan Zhang, Kunshan (CN)
Assigned to Kunshan New Flat Panel Display Technology Center Co., Ltd., Kunshan (CN)
Filed by Kunshan New Flat Panel Display Technology Center Co., Ltd., Jiangsu (CN)
Filed on Jun. 27, 2023, as Appl. No. 18/342,076.
Application 18/342,076 is a continuation of application No. PCT/CN2021/137381, filed on Dec. 13, 2021.
Claims priority of application No. 202110602514.4 (CN), filed on May 31, 2021.
Prior Publication US 2023/0343303 A1, Oct. 26, 2023
Int. Cl. G09G 3/36 (2006.01)

CPC G09G 3/3607 (2013.01) [G09G 2320/0626 (2013.01); G09G 2320/0686 (2013.01)]

9 Claims

1. A gray scale compensation method for a display panel, comprising:

establishing, on the display panel, a coordinate system for pixel points;

dividing a display region of the display panel into a first display region, a second display region and a transition display region arranged between the first display region and the second display region;

wherein the first display region is a rectangular shape, the transition display region is a rectangular ring shape and surrounds an outer periphery of the first display region, and the second display region surrounds an outer periphery of the transition display region;

wherein the coordinate system comprises a first coordinate axis and a second coordinate axis perpendicular to each other, the first coordinate axis is parallel to one pair of sides of the first display region, the second coordinate axis is parallel to the other pair of sides of the first display region, and the transition display region comprises a plurality of sub-transition regions each being a rectangular shape;

configuring a first compensation algorithm for the first display region, so that a first compensation gray scale of the first display region is obtained according to the first compensation algorithm and a first weight value, configuring, for the second display region, a second compensation algorithm different from the first compensation algorithm and a second weight value, so that a second compensation gray scale of the second display region is obtained according to the second compensation algorithm, and configuring, for the transition display region, a third compensation algorithm different from the first compensation algorithm and the second compensation algorithm, so that a third compensation gray scale of the transition display region is obtained according to the third compensation algorithm;

acquiring a coordinate using the coordinate system and an actual brightness of a pixel point to be compensated, wherein the third compensation algorithm is based on the pixel point;

obtaining the third compensation gray scale according to the coordinate and the actual brightness of the pixel point to be compensated and the third compensation algorithm;

wherein obtaining the third compensation gray scale according to the coordinate and the actual brightness of the pixel point to be compensated and the third compensation algorithm comprises:

obtaining a first reference gray scale according to the actual brightness of the pixel point to be compensated and the first compensation algorithm;

obtaining a second reference gray scale according to the actual brightness of the pixel point to be compensated and the second compensation algorithm;

obtaining, according to the coordinate of the pixel point to be compensated, the first weight value corresponding to the first reference gray scale and the second weight value corresponding to the second reference gray scale; and

obtaining the third compensation gray scale according to the first reference gray scale, the second reference gray scale, the first weight value and the second weight value;

wherein the plurality of sub-transition regions comprise a second sub-transition region comprising opposite first vertex and second vertex, the first vertex coincides with one of vertices of the first display region, and the second vertex is one of vertices of the transition display region,

in the second sub-transition region, obtaining, according to the coordinate of the pixel point to be compensated, the first weight value corresponding to the first reference gray scale and the second weight value corresponding to the second reference gray scale comprises:

obtaining the first weight value according to the formula below:

k1=√((b2−y1)/(n1−y1))²+((a2−x1)/(m1−x1))²,

correcting k1 to be equal to 1 under a condition that k1>1,

wherein k1 is the first weight value; b2 is a coordinate value of the pixel point to be compensated on the first coordinate axis; a2 is a coordinate value of the pixel point to be compensated on the second coordinate axis; n1 is a coordinate value of the first vertex on the first coordinate axis; m1 is a coordinate value of the first vertex on the second coordinate axis; y1 is a coordinate value of the second vertex on the first coordinate axis; and x1 is a coordinate value of the second vertex on the second coordinate axis, and

obtaining the second weight value according to the formula below:

k2=1−k1,

wherein k2 is the second weight value; and

configuring the display panel to display an image according to the first compensation gray scale, the second compensation gray scale and the third compensation gray scale.