Virtual Sub-Pixel Color Compensation for Emissive Displays
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Solution Overview
Problem
Emissive visual displays, such as AMOLEDs, face challenges in achieving uniform color reproduction due to manufacturing imperfections and spatial non-uniformity, leading to inconsistent user experiences.
Innovation Solution
The method involves defining virtual sub-pixel types based on physical sub-pixels, allocating color points to each type, performing color calculations to generate virtual sub-pixel brightness values, and mapping these values to physical sub-pixels to reduce color nonuniformity across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color compensation is performed using physical sub-pixel measurements directly, then color accuracy for individual pixels is improved, but color nonuniformity across the display persists due to manufacturing variations
Solution Approach 1:
The patent creates virtual sub-pixel types that are idealized copies of physical sub-pixels, with each virtual type representing a standardized color point. Instead of working directly with the non-uniform physical sub-pixels, the system creates a virtual model where each sub-pixel type has a defined color point, allowing color calculations to be performed in this standardized virtual space before mapping back to physical pixels.
Solution Approach 2:
The patent introduces virtual sub-pixel brightness values as an intermediary layer between the display signal and the physical sub-pixel values. The color sharing module calculates virtual sub-pixel brightness values based on the desired display color and the virtual sub-pixel color points, then the mapping module translates these virtual values to physical sub-pixel values, acting as a mediator that compensates for manufacturing variations.
2Manufacturing precision
If virtual sub-pixel types with standardized color points are introduced, then color uniformity across the display is improved, but the color gamut is reduced to accommodate variations
Solution Approach 1:
The patent changes the color space parameters by defining virtual sub-pixel color points that may have reduced saturation compared to the maximum capabilities of physical sub-pixels. This parameter adjustment ensures that all pixels, regardless of manufacturing variations, can achieve the virtual color points, thereby improving uniformity at the cost of potentially reducing the maximum achievable color gamut.
3Device complexity
If color calculations are performed in virtual color space, then computational complexity is reduced, but additional mapping steps are required between virtual and physical spaces
Solution Approach 1:
The patent segments the color processing into distinct modules: the color sharing module that calculates virtual sub-pixel brightness values, and the mapping module that converts virtual values to physical values. This segmentation allows each module to perform its specific function efficiently, with the color sharing module working in the simplified virtual color space and the mapping module handling the transformation to physical space.
Data Source
AI summary
What is disclosed are methods and systems for color compensation in the context of emissive displays. A set of virtual sub-pixels are defined and color points allocated for the various types of virtual sub-pixels to enable color processing within a modified color gamut, shifting the color of pixels to the modified color gamut to improve a perceived quality color rendered by the display.