Electro-optic Display Color Rendering with Crosstalk Compensation
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Solution Overview
Problem
Existing color electrophoretic displays face issues with pixelated panel blooming and crosstalk, leading to inaccurate color representation and a limited gamut, especially when displaying colors outside the convex hull of the primary colors, resulting in artifacts and instability in error diffusion methods.
Innovation Solution
A method and system that incorporate a model of blooming and crosstalk errors to predict the achievable gamut, using a processor to project input values onto the color gamut, select primary values with the smallest error, and distribute errors effectively, while also considering environmental conditions for optimal image rendering on electrophoretic displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If error diffusion methods are used to display colors outside the convex hull of primary colors, then color gamut is expanded, but artifacts and instability occur
Solution Approach 1:
The patent applies preliminary anti-action by predicting blooming and crosstalk errors before rendering the image. The system pre-calculates the achievable gamut considering these errors and constrains the input colors to this predicted gamut, preventing the artifacts and instability that would occur with conventional error diffusion methods when displaying colors outside the convex hull of primary colors.
Solution Approach 2:
The system performs preliminary action by pre-rendering the image with predicted blooming and crosstalk effects taken into account before the actual display. This pre-processing step adjusts the color values to compensate for the expected errors, so that when the image is displayed, the actual colors match the intended colors without artifacts or instability.
2Device complexity
If blooming and crosstalk effects are ignored, then rendering computation is simplified, but color accuracy deteriorates
Solution Approach 1:
The patent applies parameter changes by transforming the color space and adjusting color values based on predicted blooming and crosstalk effects. The system modifies the rendering parameters to account for these physical effects, achieving accurate color representation without requiring complex real-time calculations during actual display operation.
3Productivity
If conventional error diffusion is used without blooming model, then processing speed is maintained, but dither noise increases
Solution Approach 1:
The system performs preliminary action by pre-calculating the blooming and crosstalk effects and adjusting the color values accordingly before the actual error diffusion process. This pre-adjustment reduces the dither noise that would otherwise occur during conventional error diffusion, while maintaining processing speed because the heavy computational work is done in advance rather than in real-time during display operation.
Data Source
AI summary
A system for rendering color images on an electro-optic display when the electro-optic display has a color gamut with a limited palette of primary colors, and/or the gamut is poorly structured (i.e., not a spheroid or obloid). The system uses an iterative process to identify the best color for a given pixel from a palette that is modified to diffuse the color error over the entire electro-optic display. The system additionally accounts for variations in color that are caused by cross-talk between nearby pixels.