Demura Method for Display Panel Brightness Uniformity
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Solution Overview
Problem
Existing display panels suffer from non-uniform brightness issues, known as mura, which cannot be fully addressed through manufacturing process improvements and require external compensation, such as demura methods to correct brightness variations across pixels.
Innovation Solution
A demura method that involves obtaining brightness data from a display image, calculating demura data for each pixel, dividing it into integer and mixed gray scale values, and generating demura and mixed tables to apply gray scale compensation, effectively smoothing brightness transitions and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the demura data is rounded at low gray scales, then the bit length of pixel is reduced to match display panel capabilities, but large-area pixel groups have the same gray scale values causing perceptible brightness differences
Solution Approach 1:
The patent applies dynamics by differentiating the processing approach for different gray scale ranges. For high gray scales, standard rounding is applied, while for low gray scales, a special processing method is used where pixel groups are assigned different gray scale values based on their position and characteristics, making the system adaptive to the specific conditions of each pixel group
Solution Approach 2:
The patent implements local quality by treating different pixel groups differently based on their location and gray scale characteristics. Instead of applying uniform rounding to all pixels, the method identifies specific pixel groups in low gray scale regions and applies targeted adjustments to maintain brightness uniformity in those specific areas
2Measurement precision
If the bit length of demura data is greater than the bit length of display panel pixel, then higher precision demura compensation is achieved, but remainder rounding causes loss of compensation precision
Solution Approach 1:
The patent introduces an intermediary processing step between the high-precision demura data calculation and the display panel output. Instead of directly rounding the remainder, the method uses pixel group identification and position-based adjustment as an intermediary mechanism to preserve compensation information while adapting to the display panel's bit length constraints
Solution Approach 2:
The patent segments the pixel array into different pixel groups based on their characteristics and positions. By dividing the pixels into groups and processing each group separately with appropriate gray scale assignments, the method preserves more compensation information compared to uniform rounding of all pixels
Data Source
AI summary
A demura method for a display panel includes the steps: obtaining brightness data of a display image at a gray scale value; calculating the brightness data of the display image to obtain demura data of the pixel; dividing bits of the demura data of the pixel into first bits and second bits according to a bit length of the pixel, setting an integer gray scale value of the pixel according to the first bits, and setting a mixed gray scale value of the pixel according to the second bits.