Electrophoretic Color Filter Layout for Reduced White Graininess
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Solution Overview
Problem
Existing electrophoretic displays suffer from a grainy texture in white patterns due to the arrangement of color resist units, which worsens with increased color saturation, while minimizing this texture leads to reduced color performance.
Innovation Solution
A color filter module with a transparent substrate and a color resist layer featuring discontinuous patterns of color resist units arranged in an array, reducing the visual continuity of color blocks to mitigate grainy texture without significantly impairing color performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the area of color resist arrangement is increased to improve color saturation, then color performance is improved, but the grainy texture of white patterns becomes more obvious
Solution Approach 1:
The color resist layer is divided into multiple discrete color resist units arranged in a matrix pattern, with each unit corresponding to a specific sub-pixel region. This segmentation breaks up the continuous color blocks into separate units, reducing the grainy texture effect while maintaining the necessary color saturation through proper arrangement and density of the units.
2Object-affected harmful factors
If the area of color resist arrangement is decreased to reduce grainy texture, then grainy texture is mitigated, but color performance is lowered
Solution Approach 1:
Different regions of the color resist layer are optimized for different functions: color resist units are strategically positioned in regions where they contribute to color saturation, while gaps or reduced density are introduced in regions where they would contribute to grainy texture. This local optimization allows simultaneous improvement of both color performance and texture quality.
3Illumination intensity
If continuous color blocks are used to ensure color performance, then color saturation is maintained, but grainy texture becomes more obvious
Solution Approach 1:
Continuous color blocks are segmented into discrete color resist units arranged in a matrix pattern. Each unit is separated from others by spacing or gaps, which eliminates the continuous block structure that causes grainy texture while preserving the overall color saturation through the collective arrangement and optical properties of the individual units.
Data Source
AI summary
A color filter module is provided. The color filter module is disposed on an electrophoretic display panel. The color filter module includes a transparent substrate and a color resist layer. The transparent substrate includes a plurality of pixel regions arranged in an array. Each of the plurality of pixel regions includes a plurality of sub-pixel regions. The color resist layer is disposed on the transparent substrate. Among the plurality of sub-pixel regions of the transparent substrate, a first sub-pixel region and a second sub-pixel region that correspond to a same color and are adjacent to each other are provided with a plurality of color resist units of the same color of the color resist layer. The plurality of color resist units are arranged in an array and arranged in a discontinuous pattern.