Luminance Correction for Display Panels Using Gray Level Matrices
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Solution Overview
Problem
Display panels often suffer from luminance shifts and mura (non-uniformity) issues, leading to reduced yield and gamma optical performance exceeding control ranges, necessitating effective luminance correction methods to improve gamma parameter control.
Innovation Solution
A luminance correction method and device that collect full-picture optical information from high, low, and medium-gray level pictures, calculate target optical luminance values, and generate a gray level correction matrix to adjust actual luminance values, ensuring compliance with gamma control requirements by using optical information from entirely-black and entirely-white pictures as reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If actual full-picture optical information of a current gray level is used as a target optical luminance value, then the correction process is simple, but the optical luminance of the gray level-corrected display panel may exceed gamma control requirements when optical gamma offset is large
Solution Approach 1:
The patent applies preliminary action by pre-calculating target optical luminance values for multiple gray levels based on high-gray level and low-gray level optical information before the actual correction process. This allows the system to have predetermined reference values ready, avoiding the need to use actual current gray level information as target values, thereby preventing gamma control deviations while maintaining an efficient correction process.
Solution Approach 2:
The patent introduces an intermediary mechanism by using high-gray level and low-gray level optical information as intermediate reference points to calculate target optical luminance values for medium gray levels. This intermediary approach provides a more accurate reference framework compared to directly using current gray level information, ensuring gamma control precision while keeping the correction process manageable.
2Productivity
If display panel manufacturing processes are simplified, then production efficiency increases, but luminance uniformity and quality decrease
Solution Approach 1:
The patent applies self-service by implementing an automated correction system that collects optical information, calculates target luminance values, and generates correction matrices without requiring complex manual intervention. The system uses algorithms to automatically process the correction based on collected data, improving production efficiency while maintaining luminance uniformity through precise computational correction.
Solution Approach 2:
The patent utilizes parameter changes by transforming optical information from high and low gray levels into target luminance values for medium gray levels through mathematical calculations. This parameter transformation allows the system to correct luminance non-uniformity by adjusting gray level parameters based on calculated correction matrices, achieving high luminance uniformity without complicating the manufacturing process.
3Manufacturing precision
If more comprehensive optical information is collected for correction, then gamma control precision improves, but the complexity of the correction system increases
Solution Approach 1:
The patent applies the taking out principle by extracting only the essential optical information needed for correction - specifically full-picture optical information from high-gray level and low-gray level pictures. Rather than collecting and processing all possible optical parameters, the system focuses on extracting the critical luminance data required for calculating target optical luminance values, thereby achieving gamma control precision without excessive system complexity.
Data Source
AI summary
A luminance correction method and correction device for a display panel are disclosed. The luminance correction method for a display panel includes the following steps: collecting full-picture optical information; calculating, according to the full-picture optical information of a high-gray level picture and the full-picture optical information of a low-gray level picture, target optical luminance values corresponding to medium-gray level pictures; and comparing the full-picture optical information of the medium-gray level pictures with a target optical luminance value corresponding to a current medium-gray level picture, and obtaining a gray level correction matrix corresponding to a current gray level.