E-ink Display Sealing with Angled Walls and Heated Sealant
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Solution Overview
Problem
Conventional E-ink display devices face issues with air bubbles forming between the E-ink layer and the sealant, which degrades waterproof performance and increases production costs due to reduced production rates from prolonged coating times needed to avoid bubbles.
Innovation Solution
The E-ink display device features an active element array substrate with a contacting region and a sealing region, where the E-ink layer and protective layer have angled side walls to align with the substrate surface, allowing the sealant to flow and cure without air bubbles, using adhesive materials with specific viscosities to ensure effective sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealant coating speed is reduced to prevent air bubble formation, then waterproof performance is improved, but production rate decreases and production cost increases
Solution Approach 1:
The patent introduces a heating unit to raise the temperature of the sealant and the E-ink layer before sealing. This temperature parameter change reduces the viscosity of the sealant, allowing it to flow more easily and fill gaps without trapping air bubbles. The heated sealant can be applied at higher speeds while still preventing bubble formation, thus improving both waterproof performance and production rate.
Solution Approach 2:
The heating unit performs preliminary heating of the sealant and E-ink layer before the sealing process. This preliminary action prepares the materials by reducing sealant viscosity and preventing air bubble formation during the subsequent sealing operation, enabling faster coating speeds without compromising waterproof quality.
2Manufacturing precision
If the sealant coating speed is reduced to prevent air bubble formation, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
By changing the temperature parameter through heating, the sealant achieves optimal viscosity for bubble-free sealing at higher coating speeds. This parameter change maintains manufacturing precision while enabling increased productivity.
Solution Approach 2:
Pre-heating the sealant and E-ink layer before sealing ensures that the materials are in the optimal state for high-speed coating without bubble formation, thus maintaining sealing quality while improving production rate.
3Reliability
If the sealant coating speed is reduced to prevent air bubble formation, then waterproof performance is improved, but production cost increases
Solution Approach 1:
The heating unit changes the temperature parameter to reduce sealant viscosity, enabling faster coating speeds that maintain waterproof performance while reducing production time and associated costs.
Solution Approach 2:
The preliminary heating step prepares the sealant for efficient application, reducing the need for slow, careful coating and thereby reducing overall manufacturing time and cost while maintaining high waterproof standards.
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 enhances waterproof performance and increases process yield by preventing air bubble formation, thus improving the reliability and reducing production costs of E-ink display devices.
Implementation Method 1
a first included angle defined between the first side wall and the surface being smaller than 90 degrees or larger than 90 degrees
Implementation Method 2
The sealant is disposed on the sealing region and surrounds the E-ink layer and the protective layer
Implementation Method 3
The sealant is made of adhesive material with viscosity in the range from 20,000 centipoises (cp) to 60,000 cp
Data Source
AI summary
An E-ink display device includes an active element array substrate, an E-ink layer, a protective layer and a sealant. The active element array substrate has a surface, and the surface includes a contacting region and a sealing region. The E-ink layer is disposed on the contacting region and has a first side wall, and a first included angle defined between the first side wall and the surface being smaller than 90 degrees or larger than 90 degrees. The protective layer is disposed on the E-ink layer and has a second side wall, and a second included angle defined between the second side wall and the surface is smaller than 90 degrees or larger than 90 degrees. The sealant is disposed on the sealing region and surrounds the E-ink layer and the protective layer. A method for manufacturing the E-ink display device is also provided.