Display Device Gray Level Compensation for Lateral Leakage
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Solution Overview
Problem
Display devices face visibility degradation due to low grayscale and low luminance issues caused by lateral leakage, particularly in mixed color emissions, where existing technologies fail to adequately compensate for these issues.
Innovation Solution
A display device with a controller that adjusts gray levels and data signals by using reference coefficients for different colors and mixed colors, applying compensation filters to mitigate lateral leakage, and a data driver that generates signals based on these adjustments to ensure accurate color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lateral leakage compensation is not applied, then device complexity is low, but visibility and luminance of low grayscale areas degrade
Solution Approach 1:
The controller pre-stores reference coefficients for multiple colors (red, green, blue, cyan, magenta, yellow, white) in a lookup table before operation. When processing image data, the system determines color tendency and directly retrieves pre-calculated reference coefficients, avoiding real-time complex calculations and enabling efficient lateral leakage compensation
Solution Approach 2:
The patent replaces complex real-time mathematical calculations with a lookup table system that stores pre-computed reference coefficients. The controller substitutes computational mechanics with table-based retrieval mechanics, using color tendency determination to index into the lookup table and obtain appropriate coefficients for compensation
2Measurement precision
If reference coefficients for multiple colors are used, then color representation accuracy improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the color compensation process by storing separate reference coefficients for seven different colors (red, green, blue, cyan, magenta, yellow, white) in the lookup table. The controller determines color tendency and selects appropriate coefficients for each color channel, enabling precise compensation for different color combinations without requiring uniform high-precision storage for all possible color values
3Illumination intensity
If compensation filters are applied to all pixels, then visibility of low grayscale areas improves, but processing time increases
Solution Approach 1:
The patent applies compensation selectively based on gray level thresholds. The controller identifies pixels with gray levels below a predetermined threshold and applies lateral leakage compensation only to these low grayscale pixels, rather than processing all pixels uniformly. This partial action approach improves visibility where needed while minimizing processing time
Data Source
AI summary
A display device includes pixels, a controller, and a data driver. The controller selects a target pixel among the pixels and generates an adjusted gray level for the target pixel based on gray levels corresponding to the target pixel and relevant pixels neighboring the target pixel. The data driver generates a data signal for the target pixel based on the adjusted gray level. The target pixel, at least one of the relevant pixels, and at least one of the pixels of the display device respectively emit light of three colors different from each other. Four mixed colors are different from each other and are each a mixture of at least two of the three colors. The controller generates the adjusted gray level using reference coefficients for at least one of the three colors and for at least one of the four mixed colors.