Dynamic Block Compensation for Display Panel Mura
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Solution Overview
Problem
Existing liquid crystal display technologies face limitations in brightness unevenness compensation, particularly due to fixed block size precision, which fails to address small or high-sharpness muras effectively and results in increased hardware costs.
Innovation Solution
A dynamically variable block mode is implemented, where compensation data is stored in a table with different block sizes and distances, allowing for precise compensation of muras of varying sizes using a combination of block identifiers and compensation values, transmitted through DDR memory for efficient interpolation or direct compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the precision of block size is improved uniformly to compensate for small and high-sharpness muras, then the compensation precision is improved, but the size of compensation table and hardware cost increase
Solution Approach 1:
The patent segments the compensation table into multiple regions, each with different block sizes. Large blocks (e.g., 8×8 pixels) are used for areas with gradual brightness changes, while small blocks (e.g., 1×1 or 2×2 pixels) are used for areas with sharp brightness transitions. This segmentation allows high precision where needed without uniformly increasing the entire table size.
Solution Approach 2:
The patent applies local quality by using different compensation precisions in different spatial locations. The block size is dynamically adjusted based on local mura characteristics: small blocks for high-sharpness muras requiring precise compensation, and large blocks for low-sharpness areas where coarse compensation suffices. This resolves the contradiction by making precision local rather than universal.
2Ease of manufacture
If a fixed block size is used for data compression, then hardware cost is reduced, but small and high-sharpness muras cannot be compensated effectively
Solution Approach 1:
The patent introduces dynamic block sizing where the block size is not fixed but varies according to the local mura characteristics. The system dynamically selects appropriate block sizes (from 1×1 to 8×8 pixels or larger) based on the sharpness and size of detected muras, enabling effective compensation without uniformly high precision requirements throughout the display panel.
Solution Approach 2:
The patent changes the parameter of block size based on local conditions. Instead of using a single fixed block size, the system varies the block size parameter according to mura characteristics: smaller blocks for high-sharpness muras and larger blocks for low-sharpness areas. This parameter adaptation enables effective compensation while maintaining reasonable hardware requirements.
3Productivity
If interpolation calculation is used for fixed block size, then data compression is achieved, but high-sharpness muras such as H-line and V-line muras cannot be addressed
Solution Approach 1:
The patent segments the display area into different block size regions based on mura characteristics. For high-sharpness muras like H-line and V-line, the system segments into smaller blocks (1×1 or 2×2 pixels) that can capture sharp transitions, while using larger blocks for gradual variations. This segmentation enables both compression efficiency and sharpness preservation.
Solution Approach 2:
The patent applies partial precision where needed: full interpolation calculation is performed only for small blocks addressing high-sharpness muras, while larger blocks use coarser compensation methods. This partial application of high precision maintains compression efficiency overall while adequately addressing sharpness-critical areas.
Data Source
AI summary
A brightness-unevenness compensation method and device and a display panel are provided. The method includes: obtaining brightness-unevenness information of a display panel and a plurality of gray-scale compensation data for compensating brightness-unevenness of the display panel; storing the plurality of gray-scale compensation data in a manner of a compensation table with a plurality of compensation data groups having different compensation distances being associated with the same number of data bits and in both vertical and horizontal directions; reading the plurality of compensation data groups from the compensation table and compensating gray-scale data to-be-displayed to obtain compensated gray-scale data, after the display panel is powered on; and outputting the compensated gray-scale data for picture display. Through a dynamic variable block size mode, a block size of 8×8 pixels is used for a conventional brightness-unevenness, and a block size with a higher precision is selected for a smaller brightness-unevenness.