S-Shaped Color Filter Array for Brighter Electrophoretic Displays

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Solution Overview

Problem

Current color electrophoretic displays face issues with degraded color performance, reduced color gamut range, and impaired white balance due to insufficient or excessive areas of the color resist, which can also lead to grain patterns and texture visibility.

Innovation Solution

A color filter array design featuring color resists arranged in continuous S shapes, with sections that cover multiple sub-pixel regions, maintaining equal total areas and alternating arrangements to enhance brightness and reduce texture visibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the area of the color resist is increased, then color performance is improved, but grain pattern or texture appears affecting reading comfortability

Engineering Contradiction:

Improvecolor performanceVSAvoidgrain pattern or texture

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The color resist is divided into multiple sections (first color resist section, second color resist section, third color resist section) with different area ratios. This segmentation allows each section to have optimized area for its specific function while collectively achieving good color performance without visible grain patterns or texture.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the area of the color filter layer is reduced, then manufacturing cost is reduced, but color gamut range and white balance performance deteriorate

Engineering Contradiction:

Improvecolor gamut range and white balanceVSAvoidarea of color filter layer

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

Different sections of the color filter layer are assigned different area ratios (first section: 30-70%, second section: 20-50%, third section: 20-50%) to optimize local color filtering performance. This local quality differentiation ensures adequate color gamut and white balance while allowing overall area optimization.

Inventive Principle:

Principle #3Local quality

3Reliability

If the area of the color resist is increased to maintain color performance, then color gamut is maintained, but the display may show recognizable texture reducing overall quality

Engineering Contradiction:

Improvecolor gamutVSAvoidrecognizable texture

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The color resist sections are designed with asymmetric area ratios where the first color resist section has a different area ratio range (30-70%) compared to the second and third sections (20-50% each). This asymmetric design optimizes color performance while the varied section sizes prevent recognizable repetitive texture patterns.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS12517410B2Color filter array and color electrophoretic display having the same

Publication Date: 2026.01.06 E INK HLDG INC

AI summary

A color filter array includes a first color resist having a first color, a second color resist having a second color different from the first color, and a third color resist having a second color different from the first color and the second color. The first color resist includes multiple sections. The second color resist includes multiple sections. The third color resist includes multiple sections. When viewed in a plan view, the sections of the first color resist collectively arranged as a continuous S shape, the sections of the second color resist collectively arranged as a continuous S shape, and the sections of the third color resist collectively arranged as a continuous S shape.