Dual Color Filter Layout for Color Electrophoretic Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing color electrophoretic displays face issues with color mixing due to high or low pixel fill factors of color resists, affecting color performance and texture appearance.
Innovation Solution
Implementing a first color filter array with a smaller pixel fill factor (25-35%) and a second color filter array with a higher pixel fill factor (70-90%), with the second array being printed or ink-jetted on microcapsules, to prevent color mixing and maintain color performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pixel fill factor of the color resist is increased to improve color performance, then color saturation is improved, but color mixing occurs between adjacent color resists
Solution Approach 1:
The patent divides the color filter structure into two separate color filter arrays, each with different pixel fill factors. The first color filter array has a higher pixel fill factor (70-90%) to provide strong color saturation, while the second color filter array has a lower pixel fill factor (25-35%) to prevent color mixing between adjacent pixels. This segmentation allows each array to specialize in one function, resolving the contradiction between color performance and color mixing prevention.
Solution Approach 2:
The patent applies different pixel fill factors to different parts of the color filter system. By placing the first color filter array with high pixel fill factor and the second color filter array with low pixel fill factor at different locations, each region performs its specific function optimally - one for color saturation and the other for preventing color mixing - thus resolving the technical contradiction through spatial differentiation of properties.
2Object-generated harmful factors
If the pixel fill factor of the color resist is decreased to prevent color mixing, then color mixing is reduced, but color performance deteriorates
Solution Approach 1:
The patent segments the color filter functionality into two distinct arrays with different pixel fill factors. The first color filter array uses a low pixel fill factor (25-35%) to effectively prevent color mixing, while the second color filter array uses a high pixel fill factor (70-90%) to maintain color performance. This segmentation allows the system to achieve both goals simultaneously by distributing functions across separate components.
Solution Approach 2:
The patent combines two color filter arrays with complementary characteristics into a single display system. By merging the low pixel fill factor array (for color mixing prevention) and the high pixel fill factor array (for color performance) into one integrated structure, the system achieves both color mixing prevention and color performance without sacrificing either attribute.
3Illumination intensity
If a single color filter array with high pixel fill factor is used, then color performance is improved, but texture appears on the display
Solution Approach 1:
The patent segments the color filter into two arrays with different pixel fill factors. The first color filter array with low pixel fill factor (25-35%) prevents texture appearance by maintaining adequate spacing between color resists, while the second color filter array with high pixel fill factor (70-90%) provides the necessary color performance. This segmentation resolves the contradiction by assigning opposite functions to separate arrays.
Solution Approach 2:
The patent applies different pixel fill factor characteristics to different parts of the color filter system. The first color filter array located at one position uses low pixel fill factor to prevent texture, while the second color filter array at another position uses high pixel fill factor to enhance color performance. This local differentiation of properties resolves the contradiction between preventing texture and maintaining color quality.
Data Source
AI summary
A color electrophoretic display includes a display region, a pixel array, a display medium layer, an optical layer, a first color filter array, and a second color filter array. The display region includes multiple sub-pixel regions. The pixel array corresponds to the display region in position. The display medium layer is located on the pixel array. The optical layer is located on the display medium layer. The first color filter array is located on the optical layer. The second color filter array is located between the display medium layer and the optical layer.