Mura compensation method for display panel and display panel

Patent metadata

Field	Value
Publication number	US-10170063-B2
Application number	US-201715552292-A
Country	US
Kind code	B2
Filing date	May 24, 2017
Priority date	May 3, 2017
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A mura compensation method for display panel is disclosed, including: compressing on an array basis of n*m pixels, storing a default mura compensation value corresponding to a first pixel in each area; based on the default mura compensation value, performing linear interpolation calculation to obtain mura compensation values for pixels in the same area other than the first pixel, and performing mura compensation to the display panel; after performing mura compensation to the display panel, obtaining information of an X-th area still having mura phenomenon, the X-th area being an area formed by compression on an array basis of n*m pixels of the display panel; obtaining a final grayscale compensation curve equation; based on the default mura compensation value and the final grayscale compensation curve equation, calculating supplementary mura compensation values for pixels in the X-th area other than the first pixel; re-performing the mura compensation to the X-th area.

First claim

What is claimed is:

1. A mura compensation method for display panel, comprising:
compressing on an array basis of n*m pixels, storing a default mura compensation value corresponding to a first pixel in each area, wherein, n and m being integers greater than or equal to 2;
based on the default mura compensation value, performing linear interpolation calculation to obtain mura compensation values for pixels in the same area other than the first pixel, and performing mura compensation to the display panel;
after performing mura compensation to the display panel, obtaining information of an X-th area still having mura phenomenon, wherein the X-th area belonging to an area formed by compression on an array basis of n*m pixels of the display panel;
obtaining a final grayscale compensation curve equation;
based on the default mura compensation value and the final grayscale compensation curve equation, calculating to obtain supplementary mura compensation values for pixels in the X-th area other than the first pixel;
based on the default mura compensation value and the supplementary mura compensation values, re-performing the mura compensation to the X-th area.

2. The mura compensation method for display panel as claimed in claim 1 , wherein the step of obtaining a final grayscale compensation curve equation comprises:
storing an initial grayscale compensation curve equation;
based on the stored default mura compensation values of the X-th area and adjacent areas, calculating to obtain the final grayscale compensation curve equation.

3. The mura compensation method for display panel as claimed in claim 2 , wherein the initial grayscale compensation curve equation is:
y=ax n +bx n−1 + . . . +cx+d;
wherein y is a mura compensation value, x is the number of pixels spaced apart between the pixel with mura compensation value to be calculated in the X-th area and a reference pixel in the column or row direction; when the pixel with mura compensation value to be calculated and the first pixel are in the same row or same column, the reference pixel is the first pixel; when the pixel with mura compensation value to be calculated and the first pixel are not in the same row nor same column, the reference pixel and the pixel with mura compensation value to be calculated are in the same row or same column and the reference pixel and the first pixel in the X-th area correspond to the same column or same row; n is an integer greater than or equal to 2, a is a non-zero rational number, b, . . . , c, d are rational number.

4. The mura compensation method for display panel as claimed in claim 3 , wherein the initial grayscale compensation curve equation is:
y=ax 2 +cx+d.

5. The mura compensation method for display panel as claimed in claim 2 , wherein the initial grayscale compensation curve equation is stored in a data memory or a timing controller.

6. The mura compensation method for display panel as claimed in claim 1 wherein the method comprises a step before the step of obtaining a final grayscale compensation curve equation:
storing the final grayscale compensation curve equation.

7. The mura compensation method for display panel as claimed in claim 1 , wherein n=m.

8. A display panel, comprising:
first storage unit, for compressing on an array basis of n*m pixels, storing a default mura compensation value corresponding to a first pixel in each area, wherein, n and m being integers greater than or equal to 2;
a calculation compensation unit, for, based on the default mura compensation value, performing linear interpolation calculation to obtain mura compensation values for pixels in the same area other than the first pixel, and performing mura compensation to the display panel;
a first obtaining unit, for, after performing mura compensation to the display panel, obtaining information of an X-th area still having mura phenomenon, wherein the X-th area belonging to an area formed by compression on an array basis of n*m pixels of the display panel;
a second obtaining unit, for, obtaining a final grayscale compensation curve equation;
a calculation unit, for, based on the default mura compensation value and the final grayscale compensation curve equation, calculating to obtain supplementary mura compensation values for pixels in the X-th area other than the first pixel; and
a compensation unit, for, based on the default mura compensation value and the supplementary mura compensation values, re-performing the mura compensation to the X-th area.

9. The display panel as claimed in claim 8 , wherein the second obtaining unit comprises:
a storage sub-unit, for storing an initial grayscale compensation curve equation; and
a processing sub-unit, for, based on the stored default mura compensation values of the X-th area and adjacent areas, calculating to obtain the final grayscale compensation curve equation.

10. The display panel as claimed in claim 9 , wherein the processing sub-unit is inside a timing controller.

Assignees

• Shenzhen China Star Optoelect
• Shenzhen China Star Optoelect

Inventors

• Zhang Hua

Classifications

• G09G3/2007

  Display of intermediate tones · CPC title

• G09G3/3611 Primary

  Control of matrices with row and column drivers · CPC title

• G09G3/3607 Primary

  for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127) · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2320/0285

  using tables for spatial correction of display data · CPC title