Color E-Paper Micro-Cavity Structure for Thinner Display Layers

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Solution Overview

Problem

Existing color electronic paper display devices face issues of multiple film layers, thick thickness, and complex structure, which affect their performance and production efficiency.

Innovation Solution

The electronic paper display device incorporates a structure with an upper and lower substrate, a first and second electrode layer, and an electrophoretic display layer containing a color resistance layer with micro-cavities filled with electronic ink, simplifying the encapsulation and reducing the number of layers through the use of micro-cavities and micro-cups.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a color filter film is added to a black and white electronic paper display device, then color display is achieved, but the device thickness increases and structure becomes complex with multiple film layers

Engineering Contradiction:

Improvecolor display capabilityVSAvoidnumber of film layers

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the color filter function with the encapsulation layer by integrating the color resistance layer into the encapsulation structure. The encapsulation layer simultaneously serves as both the protective encapsulation and the color filtering element, eliminating the need for separate color filter films and reducing the total number of layers.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The encapsulation layer is designed to perform multiple functions: it provides mechanical protection, seals the electronic ink, and simultaneously acts as the color filter through the integrated color resistance layer. This multi-functional design reduces structural complexity while maintaining color display capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple encapsulation layers and color filter layers are used, then color display is achieved, but the device thickness increases

Engineering Contradiction:

Improvecolor display capabilityVSAvoiddevice thickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent combines the encapsulation layer and color filter layer into a single integrated structure. The color resistance layer is formed as part of the encapsulation layer, eliminating the need for separate color filter films and reducing the overall device thickness while maintaining color display functionality.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If traditional multi-layer encapsulation structure is used, then device reliability is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvedevice reliabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent integrates the color resistance layer formation process into the encapsulation layer manufacturing process. By forming the color resistance layer and encapsulation layer simultaneously or in an integrated sequence, the number of separate manufacturing steps is reduced, simplifying the overall manufacturing process while maintaining device reliability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The color resistance layer is formed as part of the encapsulation process, preparing the structure in advance for final assembly. This preliminary integration of color filtering functionality into the encapsulation structure reduces subsequent manufacturing steps and simplifies the overall manufacturing complexity.

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design results in a simpler, thinner, and more efficient electronic paper display device with improved contrast and reduced processing complexity, addressing the issues of multiple film layers and complex structure.

Implementation Method 1

electronic paper display device displays text and images through black and white color, and depth and light changes... based on the principle of electrophoresis

Methodology Applied

Scientific EffectElectrophoresis: Electrophoresis

Data Source

PatentUS12578611B2Electronic paper display devices and manufacturing methods thereof

Publication Date: 2026.03.17 GUANGZHOU CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

Electronic paper display devices and manufacturing methods thereof are provided. The electronic paper display device includes an upper substrate, a lower substrate, and an electrophoretic display layer. A side of the upper substrate is provided with a first electrode layer thereon. A side of the lower substrate facing the first electrode layer is provided with a second electrode layer thereon. The first electrode layer and the second electrode layer are arranged opposite to each other at a preset interval. The electrophoretic display layer is disposed between the first electrode layer and the second electrode layer, and includes a color resistance layer and a black matrix. The black matrix has openings, the color resistance layer includes a plurality of color resistance blocks arranged corresponding to the openings. Each color resistance block is provided with a micro-cavity, and the micro-cavity is filled with electronic ink containing black and white particles.