Color Electronic Paper Thermoplastic Protection Layer
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Solution Overview
Problem
Prior art color electronic paper devices suffer from color fading due to the interaction between the color filter layer and the transparent adhesive layer, which worsens at higher temperatures, leading to reduced display quality and high costs for achieving stable pigments.
Innovation Solution
A color electronic paper device is designed with a thermoplastic transparent color protection layer inserted between the color filter layer and the transparent adhesive layer to prevent erosion and maintain color saturation, using a manufacturing process involving hot rolling and autoclave deaeration with thermoplastic resin like Polyvinyl Butyral or Polyvinyl chloride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highly stable chemically inactive pigments are used in the color filter layer, then color fading is avoided, but manufacturing cost increases significantly
Solution Approach 1:
A protective layer is introduced as an intermediary between the color filter layer and the transparent adhesive layer. This protective layer acts as a barrier that prevents harmful interactions between the adhesive and pigments, thereby maintaining color stability without requiring expensive chemically inactive pigments throughout the entire structure.
Solution Approach 2:
The protective layer is applied in advance before the transparent adhesive layer is deposited. This preliminary action prevents direct contact between the adhesive and the color filter layer, proactively preventing color fading before it can occur, rather than relying on expensive pigment materials to resist degradation.
2Device complexity
If the color filter layer is directly adhered to the transparent adhesive layer, then device structure is simplified, but color fading occurs due to interaction between layers
Solution Approach 1:
The protective layer serves as a mediator between the color filter layer and the transparent adhesive layer. It physically separates these two layers, preventing direct interaction that causes color fading, while still allowing the device to maintain a relatively simple overall structure with only one additional layer.
3Ease of manufacture
If high temperature processing is used during manufacturing, then adhesive bonding is improved, but color fading is accelerated
Solution Approach 1:
The protective layer is applied beforehand to cushion and protect the color filter layer from the high temperature processing that occurs during adhesive bonding. This protective barrier prevents thermal damage and color fading while still allowing the adhesive bonding process to proceed effectively.
Solution Approach 2:
The protective layer acts as a thermal intermediary that protects the temperature-sensitive color filter layer from direct exposure to high temperatures during adhesive bonding, enabling the bonding process to proceed without causing color fading.
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
The solution effectively prevents color fading by using a thermoplastic material layer, enhancing display quality and reducing production costs while maintaining color saturation, applicable to both flexible and non-flexible displays.
Implementation Method 1
The color protection layer is a thermoplastic transparent material layer placed over the color filter layer
Implementation Method 2
adhering a bottom face of a color protection layer to a top face of the color filter layer, and the color protection layer is a thermoplastic transparent material layer
Data Source
AI summary
A color electronic paper device and manufacturing method thereof are provided. The device includes: a front panel; a color filter layer, placed over the front panel; a color protection layer, being a thermoplastic transparent layer placed over the color filter layer; an adhesive layer, placed over the color protection layer; and a cover, placed over the adhesive layer.