Display Panel Brightness Compensation for Non-Anchor Grayscale Accuracy
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Solution Overview
Problem
The display effect is affected by non-anchor grayscales in display panels due to inaccurate data voltages obtained through linear interpolation, which deviate from the Gamma curve, leading to suboptimal viewing experiences.
Innovation Solution
A brightness compensation method that determines a brightness compensation function by correcting a nonlinear function based on preset and theoretical brightness information for anchor grayscales, ensuring accurate data voltages for both anchor and non-anchor grayscales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If linear interpolation algorithm is used to obtain data voltages for non-anchor grayscales, then storage space requirement is reduced, but brightness accuracy deviates from Gamma curve
Solution Approach 1:
The patent changes the mathematical model from linear interpolation to a power function model with Gamma exponent. By adjusting the exponent parameter to match the Gamma curve characteristics, the system achieves accurate brightness representation for non-anchor grayscales while maintaining limited storage requirements in the voltage lookup table.
Solution Approach 2:
The patent replaces the linear interpolation computational approach with a power function calculation system. This substitution allows the system to compute accurate Gamma-curve-compliant voltages for non-anchor grayscales using the formula V = V_max * (gray/255)^gamma, where gamma is the display panel's Gamma exponent.
2Productivity
If only anchor grayscales are stored in register, then storage efficiency is improved, but display effect deteriorates due to inaccurate non-anchor grayscale voltages
Solution Approach 1:
The patent introduces a power function calculation as an intermediary between the stored anchor grayscale voltages and the final display output. This intermediary computes accurate voltages for non-anchor grayscales by applying the Gamma-based power function, thereby maintaining display quality without requiring storage of all grayscale values.
Solution Approach 2:
The patent performs preliminary storage of only critical anchor grayscale voltage values in the register. The complete set of grayscale voltages is generated on-demand through power function calculation when needed for display, eliminating the need to pre-store all 256 grayscale voltage values while ensuring accuracy.
Data Source
AI summary
Provided are a brightness compensation method, a driving method for a display panel and a display device. The brightness compensation method is configured to determine a brightness compensation function of the display panel. For a first Gamma value, the method includes: determining a first grayscale interval including at least three anchor grayscales and a plurality of non-anchor grayscales; acquiring an initial nonlinear function corresponding to the first grayscale interval, and correcting the nonlinear function corresponding to the first grayscale interval according to preset brightness information and theoretical brightness information corresponding to the anchor grayscales in the first grayscale interval. The brightness information corresponding to the non-anchor grayscale acquired according to the corrected nonlinear function is close to the ideal brightness information.