Three-Region OLED Color Space Using Dithering Against Crosstalk
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Solution Overview
Problem
Crosstalk in displays, particularly in pixelated devices like OLEDs, leads to desaturation of highly saturated colors due to unintended light emission from non-emitting pixels, reducing the effective color gamut and image quality.
Innovation Solution
A pixelated display with a color space divided into three regions: an outer boundary for most saturated colors, an inner region for less saturated colors, and an intermediate region where colors are generated by dithering between the most and less saturated colors, using spatial or temporal dithering methods to reduce crosstalk effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dithering is applied to generate intermediate colors, then the color space coverage is improved, but the image processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining discrete color regions and their boundaries in the color space before actual image rendering. The system pre-establishes which pixels should emit which colors based on their spatial location and the desired color space coverage, avoiding the need for complex real-time dithering calculations during image processing.
Solution Approach 2:
The patent segments the color space into distinct regions with defined boundaries, where each region corresponds to a specific color emission pattern. This segmentation allows the display to handle different color regions independently, simplifying the processing complexity while maintaining comprehensive color space coverage.
2Manufacturing precision
If crosstalk reduction is implemented by controlling pixel emission, then color saturation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by implementing different emission control strategies for different pixels based on their specific locations and the colors they are supposed to emit. Each pixel's emission is independently controlled according to its role in the overall color space coverage, allowing for precise crosstalk reduction without requiring uniform high precision across all pixels.
Solution Approach 2:
The patent employs feedback mechanisms where the actual emission from pixels is monitored and used to adjust the emission control signals. This feedback loop allows the system to compensate for manufacturing variations and achieve the desired color saturation and crosstalk reduction even with moderate manufacturing precision.
Data Source
AI summary
A pixelated color display where the emission corresponds to a color space comprised of three regions: an outer boundary of the entire color space which is defined by the most saturated colors; an inner region formed by less saturated colors which is defined by an inner region boundary; and between the inner region boundary and the outer boundary, an intermediate region where at least one color is approximated by dithering between a most saturated color and a less saturated color. The dithering can be color spatial, temporal, or physical spatial dithering or combinations thereof. The display is an OLED, preferably a multimodal (white light-emitting) microcavity with a color filter array and can have 3 or more stacks of light-emitting units. The color dithering in the intermediate region allows for generation of colors that cannot be emitted directly by the display.