In-cell Display Touch Screen Adhesive Moisture Resistance
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Solution Overview
Problem
In-cell display apparatuses with integrated touch screens face reliability issues due to reduced adhesive force of the adhesive layer caused by water and thermal expansion, leading to cracks in the adhesive layer and reduced performance.
Innovation Solution
A display apparatus with a pixel array layer, encapsulation layer, touch electrode layer, planarization layer, insulation layer, and a functional film attached using a film adhesive member, where the insulation layer includes a molecule-adsorbing material to prevent water and outgas fumes from affecting the adhesive force, enhancing moisture resistance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a functional film is attached directly to the touch electrode layer using an adhesive layer, then the device structure is simplified, but the adhesive force is reduced by water and thermal expansion causing cracks
Solution Approach 1:
An insulation layer is introduced as an intermediary component between the touch electrode layer and the functional film. This insulation layer includes a molecule-adsorbing material that acts as a mediator to adsorb water and outgas fumes, preventing these substances from degrading the adhesive force between the adhesive layer and the functional film, thereby resolving the contradiction between simplified structure and reliable adhesion.
Solution Approach 2:
The insulation layer is constructed using composite materials that combine insulating properties with molecule-adsorbing capabilities. This composite structure provides both electrical insulation necessary for touch screen operation and moisture adsorption to maintain adhesive integrity, solving the problem of adhesive degradation while maintaining structural simplicity.
2Ease of manufacture
If the functional film is attached directly to the touch electrode layer, then manufacturing steps are reduced, but cracks occur due to thermal expansion coefficient mismatch
Solution Approach 1:
The insulation layer serves as a buffer intermediary between layers with different thermal expansion coefficients. The molecule-adsorbing material in the insulation layer compensates for stress caused by thermal expansion mismatch, preventing crack formation in the adhesive layer while adding minimal manufacturing complexity.
3Ease of manufacture
If water and outgas fumes are present in the adhesive layer, then the device can be manufactured with standard materials, but the adhesive force is reduced leading to reliability issues
Solution Approach 1:
The molecule-adsorbing material in the insulation layer converts the harmful presence of water and outgas fumes into a beneficial adsorption process. These substances are naturally present during manufacturing, but the insulation layer actively captures them, preventing adhesive degradation while allowing standard manufacturing processes to be used.
Solution Approach 2:
The insulation layer acts as a protective intermediary that isolates the adhesive layer from water and outgas fumes. By placing this molecule-adsorbing layer between the adhesive layer and the functional film, the system maintains adhesive performance without requiring specialized manufacturing conditions.
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 maintains the adhesive force of the film adhesive member, preventing cracks and improving the reliability and moisture resistance of the display apparatus by adsorbing water and outgas fumes, thus enhancing the overall performance of the integrated touch screen.
Implementation Method 1
the insulation layer includes a molecule-adsorbing material to prevent water and outgas fumes from affecting the adhesive force
Data Source
AI summary
A display apparatus with integrated touch screen is provided, which has improved reliability. The display apparatus includes a pixel array layer provided on a substrate, an encapsulation layer surrounding the pixel array layer, a touch electrode layer provided on the encapsulation layer, a planarization layer provided on the touch electrode layer, an insulation layer provided on the planarization layer, and a functional film attached on the insulation layer by a film adhesive member.