Grayscale compensation method, apparatus and system, display driving method, apparatus and system, and chip and medium
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Solution Overview
Problem
OLED display panels exhibit nonuniform brightness due to differences in TFT characteristics, leading to unsatisfactory display quality despite existing compensation methods like pixel compensating circuits and De-Mura algorithms.
Innovation Solution
A grayscale compensating method that determines compensation and correction coefficients for sub-pixels, distinguishing between brightening and darkening regions, and adjusts brightness levels to ensure uniformity by using specific correction coefficients based on the compensation coefficients and to-be-displayed grayscale values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If De-Mura algorithm is used for grayscale compensation to each pixel individually, then compensation is performed on brightness nonuniformity, but the problem of brightness nonuniformity still exists and black block issues occur
Solution Approach 1:
The patent divides the display panel into multiple displaying region blocks based on compensation coefficients, and applies different correction coefficient determination methods to different regions. Specifically, regions with positive compensation coefficients (first displaying region block) use preset correction coefficients, while regions with negative compensation coefficients (second displaying region block) use dynamically determined correction coefficients based on target conditions. This segmented approach prevents black block issues while maintaining brightness uniformity.
Solution Approach 2:
The patent applies different compensation strategies to different local regions of the display panel. For sub-pixels in the first displaying region block (positive compensation coefficients), preset correction coefficients are used. For sub-pixels in the second displaying region block (negative compensation coefficients), correction coefficients are determined dynamically based on grayscale values and target conditions. This local differentiation resolves the contradiction by tailoring compensation to specific regional characteristics.
2Device complexity
If compensation coefficients are applied uniformly to all sub-pixels, then brightness compensation is simplified, but brightness nonuniformity cannot be effectively corrected
Solution Approach 1:
The patent segments the display panel into multiple displaying region blocks based on compensation coefficient characteristics, allowing different compensation strategies for different regions. This segmentation enables effective brightness uniformity correction without requiring overly complex uniform compensation across the entire panel.
Solution Approach 2:
Different correction coefficient determination methods are applied to different local regions: preset coefficients for regions with positive compensation needs, and dynamically determined coefficients for regions with negative compensation needs. This local quality approach achieves effective brightness correction while managing complexity.
3Measurement precision
If correction coefficients are determined dynamically for all sub-pixels, then brightness precision is improved, but computational complexity increases
Solution Approach 1:
The patent segments sub-pixels into two groups based on compensation coefficient signs, applying different computational approaches to each group. This segmentation reduces overall computational complexity while maintaining precision where needed.
Solution Approach 2:
Dynamically determined correction coefficients are applied locally only to sub-pixels in the second displaying region block where precision is most critical (negative compensation coefficients). Sub-pixels in the first displaying region block use simpler preset coefficients, reducing overall computational complexity while maintaining necessary precision.
Data Source
AI summary
A grayscale compensating method, a displaying driving method, an apparatus, a system, a chip and a medium. The grayscale compensating method includes: determining compensation coefficients corresponding to a plurality of sub-pixels in a display panel, wherein the compensation coefficients are for characterizing the compensation modes and the compensation magnitudes of brightness compensations to the sub-pixels, wherein the compensation modes include the mode of increasing the brightness and the mode of reducing the brightness; based on the compensation coefficients and to-be-displayed grayscale values corresponding to the sub-pixels, determining correction coefficients corresponding to the plurality of sub-pixels, wherein unequal to-be-displayed grayscale values correspond to unequal correction coefficients, and the correction coefficients are for correcting the compensation magnitudes; and based on the compensation coefficients and the correction coefficients, compensating for the to-be-displayed grayscale values of the plurality of sub-pixels, to reduce the difference in the emitted-light brightnesses of the plurality of sub-pixels.