Display Panel Grayscale Compensation via Regional Gamma Segmentation
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Solution Overview
Problem
Display panels face low precision in grayscale compensation due to varying gamma values across the panel, leading to suboptimal brightness demura repair when using a single center gamma value for compensation.
Innovation Solution
The method involves dividing the display panel into main and sub-display regions based on image data, calculating average gamma values for each sub-region, and determining grayscale compensation values for each pixel using these averages, thereby improving precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single center gamma value is used for grayscale compensation, then the compensation process is simple, but the precision of grayscale compensation is low due to varying gamma values across the panel
Solution Approach 1:
The display panel is divided into multiple sub-display regions based on brightness difference thresholds. Each sub-region is assigned its own average gamma value calculated from image data of pixels in that region. This segmentation allows different gamma values to be applied to different regions, improving compensation precision while maintaining manageable process complexity through automated region detection and classification.
2Measurement precision
If regional average gamma values are calculated for sub-display regions, then grayscale compensation precision is improved, but the complexity of data processing increases
Solution Approach 1:
Image data is pre-acquired for multiple bonding point grayscale values before compensation calculation. The data is pre-organized by pixel coordinates and brightness values, enabling systematic processing. Preliminary division into sub-regions based on brightness thresholds prepares the data structure for efficient gamma value calculation and subsequent compensation application.
Solution Approach 2:
The system uses the display panel's own image data to automatically determine sub-display regions and calculate average gamma values. The brightness-grayscale relationship curve is fitted using the panel's actual performance data, allowing the system to self-calibrate and adapt to the specific characteristics of each display panel without requiring external measurement equipment or manual configuration.
3Measurement precision
If a brightness-grayscale relationship curve is fitted for each pixel, then compensation accuracy is improved, but the computational time and complexity increase
Solution Approach 1:
Instead of fitting a brightness-grayscale relationship curve for each individual pixel separately, the method merges pixels into sub-display regions and calculates a single average gamma value for each region. This aggregation approach maintains compensation accuracy by accounting for regional variations while significantly reducing computational complexity and time requirements compared to per-pixel curve fitting.
Data Source
AI summary
The present invention discloses a display panel grayscale compensation method, a grayscale compensation device, and a grayscale compensation system. The grayscale compensation method, by acquiring at least one set of image data corresponding to bonding point grayscale values of the display panel, and by dividing the display panel into a main display region and sub-display regions through the image data, can determine grayscale compensation values corresponding to pixels in the sub-display region according to the average gamma value of each sub-display region, which can increase precision of a single grayscale compensation of the pixels in the display panel.