Display Luminance and Color Compensation via Pixel Lookup Tables
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Solution Overview
Problem
Self-luminous display panels exhibit poor luminance and color uniformity due to variations in light-emitting wavelengths of light-emitting diodes, resulting in mottled display images even when all pixels display the same grayscale.
Innovation Solution
A luminance and color compensation method that calculates compensation values for display pixels based on selected colors, records these values to create look-up information, and adjusts display luminance and color point-by-point during image display to improve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If self-luminous display panel uses light-emitting diodes with different light-emitting wavelengths due to process differences, then manufacturing is simplified, but display luminance and color uniformity deteriorates
Solution Approach 1:
The patent measures and records the actual light-emitting characteristics of each LED before display operation, storing compensation data in advance. This preliminary characterization allows the system to pre-calculate compensation values for each pixel, addressing the uniformity issue before it manifests in actual display operation.
Solution Approach 2:
The patent applies individualized compensation to each display pixel based on its specific LED characteristics. By measuring and compensating each pixel's luminance and color separately rather than applying a uniform correction, the system addresses local variations in LED performance caused by process differences.
2Manufacturing precision
If point-by-point luminance and color compensation is implemented for each display pixel, then display uniformity is improved, but system complexity increases
Solution Approach 1:
The patent creates a digital model (look-up table) that copies and stores the measured characteristics of each pixel's LED. This digital representation allows the system to reference pre-calculated compensation data during operation, avoiding the need for complex real-time calculations while maintaining point-by-point compensation capability.
Solution Approach 2:
The patent replaces complex real-time computational mechanisms with a simpler lookup-based system. Instead of performing complex calculations during each display operation, the system substitutes this with straightforward data retrieval from pre-computed look-up tables, reducing operational complexity.
3Speed
If look-up information is created and stored for compensation values, then compensation speed during display operation is improved, but data storage requirements increase
Solution Approach 1:
The patent creates look-up tables for representative grayscale values rather than all possible values. By selecting key representative points across the grayscale range and using interpolation for intermediate values, the system achieves fast compensation operation with reduced storage requirements compared to maintaining complete lookup data for every possible input.
Data Source
AI summary
A display device and a luminance and color compensation method thereof are provided. The luminance and color compensation method includes: calculating a plurality of compensation values of a plurality of display pixels of a plurality of setting grayscale values based on at least one selected color; recording the compensation values to obtain look-up information; receiving a plurality of image grayscale values of a display image, and obtaining a plurality of selected compensation values respectively corresponding to the display pixels according to the look-up information based on the image grayscale values; and respectively compensating display luminance of the display pixels according to the selected compensation values.