Display Grayscale Compensation With Trend-Based Coefficient Selection
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Solution Overview
Problem
The complexity of display panel manufacturing leads to significant differences in optical properties, resulting in poor uniformity of display, which existing Demura and uniformity compensations fail to adequately address due to mutual cancellation of their effects.
Innovation Solution
Determine target grayscales with consistent and inconsistent brightness trends, calculate Demura and uniformity compensation coefficients within specific intervals, and apply them selectively to prevent cancellation, enhancing display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both Demura compensation and uniformity compensation are applied simultaneously, then compensation coverage is comprehensive, but compensation effects cancel each other out reducing display uniformity
Solution Approach 1:
The patent segments the grayscale range into multiple intervals based on brightness trend consistency. Different compensation strategies are applied to different intervals: in consistent intervals, uniformity compensation is applied; in inconsistent intervals, only Demura compensation is applied. This segmentation prevents compensation cancellation and improves overall display uniformity.
Solution Approach 2:
The patent applies different compensation coefficients and strategies to different grayscale intervals based on their specific brightness characteristics. Rather than applying a single uniform compensation approach, the system tailors the compensation method to local grayscale characteristics, ensuring optimal compensation effectiveness in each interval.
2Illumination intensity
If Demura compensation is applied to all grayscales, then comprehensive brightness correction is achieved, but uniformity compensation effect is reduced due to mutual cancellation
Solution Approach 1:
The patent dynamically adjusts the compensation strategy based on the grayscale interval being displayed. The system determines brightness trend consistency for each interval and switches between different compensation modes (uniformity compensation in consistent intervals, Demura-only in inconsistent intervals), making the compensation system adaptive rather than static.
Solution Approach 2:
The patent changes the compensation parameters (which coefficients are applied) based on the grayscale interval's brightness trend characteristics. By modifying which compensation coefficients are active in different intervals, the system optimizes compensation effectiveness and prevents parameter cancellation.
3Manufacturing precision
If uniformity compensation is applied to all grayscales, then uniformity improvement is maximized, but compensation accuracy decreases due to inconsistent brightness trends
Solution Approach 1:
The patent segments the grayscale range into consistent and inconsistent brightness trend intervals. Uniformity compensation is only applied in intervals where brightness trends are consistent, ensuring high compensation accuracy. In intervals with inconsistent trends, uniformity compensation is excluded to prevent inaccurate compensation.
Data Source
AI summary
A display compensation method, including: acquiring brightness parameters of two or more target grayscales of a display panel, and determining, based on the brightness parameters, target grayscales with consistent brightness trends and target grayscales with inconsistent brightness trends; determining a brightness trend consistency interval of grayscales according to the target grayscales with consistent brightness trends and the target grayscales with inconsistent brightness trends; calculating, for target grayscales in all grayscales of the display panel, a Demura compensation coefficient by using a Demura compensation algorithm; calculating, for target grayscales of the display panel that are within the brightness trend consistency interval, a uniformity compensation coefficient by using a uniformity compensation algorithm; writing the Demura compensation coefficient and the uniformity compensation coefficient into a driving integrated circuit (IC), to cause the driving IC to perform compensation according to the Demura compensation coefficient and the uniformity compensation coefficient.