Display Device Luminance Compensation for Low-Grayscale Leakage
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Solution Overview
Problem
Display devices experience a deviation in luminance between panels in low-grayscale regions due to lateral leakage between pixels, leading to reduced display quality.
Innovation Solution
A display device and method that include a controller generating an output grayscale value based on an input grayscale value, a remapped grayscale value, and a gain value calculated from measured luminance, to compensate for luminance deviations in low-grayscale regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If display devices are manufactured with standard pixel structures, then production cost and device complexity are kept low, but luminance deviation occurs in low-grayscale regions due to lateral leakage between pixels
Solution Approach 1:
The controller pre-calculates and stores compensation values for different grayscale levels during the manufacturing process. These compensation values are stored in a lookup table and applied automatically during normal operation, eliminating the need for real-time complex calculations while achieving luminance uniformity across different grayscale regions.
Solution Approach 2:
The patent modifies the grayscale voltage parameters by applying compensation values to each grayscale level. This parameter adjustment compensates for the lateral leakage effect without changing the physical pixel structure, thereby improving luminance uniformity while maintaining manufacturing simplicity.
2Manufacturing precision
If gain compensation is applied to low-grayscale values, then luminance deviation is reduced, but the processing complexity and computational load increase
Solution Approach 1:
The compensation lookup table is pre-computed and stored during manufacturing. During operation, the controller simply retrieves the appropriate compensation value from the table based on the input grayscale level, avoiding real-time complex computations while achieving gain compensation for luminance uniformity.
Solution Approach 2:
The patent uses a lookup table that stores pre-calculated compensation values, essentially creating a reference copy of the ideal compensation curve. This allows the system to apply accurate compensation without performing complex real-time calculations, reducing processing complexity while maintaining luminance uniformity.
Data Source
AI summary
A display device may include a display panel that includes pixels each displaying one of a red, a green, and a blue, a controller that generates an output grayscale value based on an input grayscale value, a remapped grayscale value corresponding to the input grayscale value, and a gain value calculated based on a measured luminance of the display panel corresponding to a specific grayscale, and a data driver that generates a data signal based on the output grayscale value and provides the data signal to each of the pixels.