OLED Mura Elimination via Local Gamma Iterative Compensation
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Solution Overview
Problem
Current Demura algorithms are not suitable for OLED display panels due to differences in gamma curves between pixel dots, particularly in Mura areas, leading to inadequate brightness compensation and non-uniform display quality.
Innovation Solution
A method involving an OLED display panel and a brightness capturing device, where the panel is shown 255 gray scales, and local gamma values are calculated to determine compensation gray scales using specific formulas based on target brightnesses and actual brightnesses, iteratively adjusting until the desired brightness uniformity is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a unified gamma value or gamma curve is used for Demura compensation in OLED display panels, then the calculation process is simple, but the compensation result is inaccurate due to gamma curve differences in Mura areas
Solution Approach 1:
The patent divides the display panel into multiple local regions and calculates separate gamma values for each region based on captured brightness data. This local gamma value approach allows each region to be compensated according to its specific characteristics, resolving the contradiction between simple calculation and accurate compensation by making the compensation adaptive to local variations rather than applying a unified gamma value across the entire panel.
2Manufacturing precision
If Demura compensation is performed with detailed iterative calculations, then brightness uniformity is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary capture of actual brightness values across the display panel before compensation calculations. By pre-acquiring the brightness data and organizing it by regions, the system prepares the necessary information in advance, which streamlines the subsequent iterative compensation process and reduces overall processing time while maintaining brightness uniformity.
Solution Approach 2:
The patent implements an iterative compensation process where gamma values and compensation values are dynamically adjusted based on captured brightness feedback. The system repeatedly captures brightness, calculates local gamma values, and updates compensation values until convergence is achieved or maximum iterations are reached. This dynamic iterative approach ensures optimal brightness uniformity while allowing early termination if satisfactory results are achieved quickly.
3Manufacturing precision
If multiple iterative compensations are performed, then the brightness uniformity is significantly improved, but the processing time and computational load increase
Solution Approach 1:
The patent implements a termination condition that stops the iterative compensation process when either the maximum number of iterations is reached or the brightness uniformity meets a preset threshold. This partial action approach avoids performing unnecessary additional iterations once satisfactory compensation is achieved, thereby maintaining high brightness uniformity while preventing excessive computational load and processing time.
Data Source
AI summary
The present invention provides a method of eliminating OLED display panel Mura. First, a corresponding calculation formula is selected by comparing the gamma value of the OLED display panel and the local gamma value at the present display gray scale, and the compensation gray scale which should be utilized is calculated, and then the OLED display panel is made to show the present compensation gray scale captured with the present calculation to determine whether the preset condition of ending the calculation of the compensation gray scale is achieved, and if the preset condition of ending the calculation of the compensation gray scale is not achieved, the iterative computation does not stop until the preset condition of ending the calculation of the compensation gray scale is achieved, which can rapidly and effectively eliminate the OLED display panel Mura to ensure the brightness uniformity of the OLED display panel.