Display Apparatus Gamma Curve Segmentation for Color Shift Reduction
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Solution Overview
Problem
Liquid crystal display apparatuses face challenges in improving side visibility and reducing color shift phenomena, particularly due to the washout effect caused by white sub-pixels and differences in front and side visibility.
Innovation Solution
A display apparatus and driving method that involve a mapper to generate primary and white data, a splitter to apply different gamma curves for primary and white data, and a compensator to adjust color coordinates, ensuring that primary data is compensated based on target color coordinates and white luminance values, thereby reducing color shift and enhancing visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white sub-pixels are added to increase brightness, then display brightness is improved, but washout phenomenon and color shift occur
Solution Approach 1:
The patent segments the gamma curve application by creating two distinct gamma curves: a first gamma curve for primary color sub-pixels (R, G, B) and a second gamma curve for white sub-pixels. This segmentation allows independent optimization of gamma characteristics for different sub-pixel types, enabling the white sub-pixels to contribute to brightness without causing washout or color shift when viewed from the front.
Solution Approach 2:
The patent applies different gamma curve characteristics to different sub-pixel regions. The first gamma curve is optimized for primary color sub-pixels while the second gamma curve is specifically designed for white sub-pixels. This local quality differentiation ensures that each sub-pixel type contributes optimally to the overall display quality, preventing the white sub-pixels from causing harmful washout effects on the primary color display.
2Illumination intensity
If different gamma curves are applied to primary and white data, then front visibility is improved, but color coordinate accuracy may deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the color coordinates of the displayed image are measured and compared against target color coordinates. Based on this comparison, the system adjusts the gamma curves or driving voltages to compensate for any color deviations. This feedback loop ensures that while different gamma curves are applied to optimize front visibility, the color coordinate accuracy is maintained within acceptable tolerances.
Solution Approach 2:
The patent dynamically adjusts gamma curve parameters based on operating conditions. The first and second gamma curves are not fixed but can be modified to optimize both front visibility and color accuracy. By changing gamma parameters adaptively, the system maintains color coordinate accuracy even when applying different gamma characteristics to primary and white sub-pixels.
Data Source
AI summary
A display apparatus includes a mapper configured to map a primary color data including information on three primary colors to generate mapping primary data including red, green, and blue information and mapping white data including white information, a splitter configured to generate split primary data based on the mapping primary data and one gamma curve, and to generate split white data based on the mapping white data and another gamma curve different from the one gamma curve, and a compensator configured to compensate for the split primary data based on a target color coordinate and a primary color coordinate corresponding to a color coordinate of the split primary data to generate compensated primary data.