Color Filter for Electronic Ink Displays

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Solution Overview

Problem

Conventional electronic ink display devices are unable to display colorful images due to material limitations, necessitating a suitable color filter for these devices.

Innovation Solution

A color filter comprising a first substrate, a patterned color resist layer with multiple color resist layers, a patterned passivation layer, a transparent adhesive layer, and a second substrate, where the passivation layer is strategically positioned to prevent chromaticity changes and facilitate bubble removal during manufacturing, enabling effective light modulation and image display.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional electronic ink display devices use traditional materials, then the device structure remains simple, but the device cannot display colorful images

Engineering Contradiction:

Improvecolor display capabilityVSAvoidcolor filter structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The color filter is divided into multiple color resist layers (first color resist layer, second color resist layer, etc.) with different color characteristics. Each layer is independently patterned and positioned on the first substrate, allowing separate control and optimization of different color regions to achieve full-color display capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from conventional single-layer or two-layer color filters to a multi-layer stacked structure. By adding vertical dimensionality with multiple color resist layers and corresponding passivation layers, the filter achieves enhanced color rendering while maintaining a planar configuration suitable for electronic ink displays

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Stability of the object's composition

If a patterned passivation layer is used to prevent chromaticity changes, then color stability is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvechromaticity stabilityVSAvoidpatterned passivation layer fabrication

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The passivation layer is selectively applied only in regions where chromaticity protection is needed, forming a patterned structure. This localized approach prevents unnecessary material deposition in other areas, maintaining color stability where required while simplifying the overall manufacturing process

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patterned passivation layer is formed before subsequent manufacturing steps that could potentially cause chromaticity changes. This preliminary protective action prevents color degradation in advance, ensuring color stability without requiring complex post-processing

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If multiple color resist layers are stacked, then color display capability is enhanced, but the risk of bubble formation increases

Engineering Contradiction:

Improvecolor image displayVSAvoidbubble formation

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patterned passivation layer is strategically positioned to create gaps between stacked color resist layers. These gaps extract and eliminate trapped air bubbles that would otherwise form between the layers during assembly, allowing bubbles to escape while maintaining the multi-layer color structure

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patterned passivation layer creates a porous or gap-filled structure between color resist layers. This controlled porosity allows air bubbles to escape during the stacking process while maintaining structural integrity and color display functionality

Inventive Principle:

Principle #31Porous materials

4Strength

If the adhesive layer covers the entire patterned passivation layer, then bonding strength is improved, but bubble removal becomes more difficult

Engineering Contradiction:

Improveadhesive bonding strengthVSAvoidbubble removal ease

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The adhesive layer is applied selectively rather than uniformly across the entire passivation layer. By concentrating adhesive application in specific regions where bonding is needed while leaving gaps in other areas, the structure maintains bonding strength while providing pathways for bubble removal

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8767148B2Color filter and display device having the same

Publication Date: 2014.07.01 TRANSCEND OPTRONICS (YANGZHOU) CO LTD

AI summary

Disclosed herein is a color filter, which includes a first substrate, a patterned color, resist layer, a patterned passivation layer, an adhesive layer and a second substrate. The patterned color resist layer is disposed on the first substrate. The patterned passivation layer is stacked on the patterned color resist layer. The adhesive layer covers the patterned protective layer. The second substrate is disposed on the adhesive layer. A display device having the color filter is disclosed herein as well.