Integrated Touch Screen Encapsulation Against Electrode Water Ingress
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Solution Overview
Problem
Organic light-emitting display apparatuses with integrated touch screens face issues with water penetration into touch electrodes, leading to oxidation and reduced adhesive force between the organic layer and the adhesive layer, especially in high temperature and humidity environments, causing touch functionality failures.
Innovation Solution
A display apparatus with an integrated touch screen is designed, featuring a light-emitting device layer, a first encapsulation layer with at least one inorganic layer, a touch sensing layer, and a second encapsulation layer with at least one inorganic layer to prevent water penetration into the touch electrodes, enhancing the adhesive force between layers and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic layer is provided on the first touch electrodes, second touch electrodes, and bridge electrodes to enable touch sensing, then touch functionality is achieved, but water penetration into the organic layer causes oxidation of touch electrodes and reduced adhesive force, leading to interface de-bonding in high temperature and humidity environments
Solution Approach 1:
An inorganic layer is introduced as an intermediary between the organic layer and the touch electrodes (first touch electrodes, second touch electrodes, and bridge electrodes). This inorganic layer serves as a barrier that prevents water from penetrating through the organic layer to reach and oxidize the touch electrodes, while maintaining the adhesive force and preventing interface de-bonding in high temperature and humidity environments.
2Strength
If the organic layer is attached to the upper substrate by an adhesive layer, then the organic layer is secured in place, but particles and air bubbles in the organic layer reduce adhesive force and cause interface de-bonding under harsh environmental conditions
Solution Approach 1:
The inorganic layer acts as a mediator between the organic layer and the adhesive layer, providing a stable interface that is not affected by particles and air bubbles present in the organic layer. This intermediary layer ensures consistent adhesive force and prevents interface de-bonding even when the organic layer contains manufacturing defects, thereby improving the reliability of the interface bonding under harsh environmental conditions.
Data Source
AI summary
A display apparatus with an integrated touch screen is provided. The display apparatus includes: a light-emitting device layer on a first substrate, a first encapsulation layer on the light-emitting device layer, a touch sensing layer on the light-emitting device layer, and a second encapsulation layer on the touch sensing layer, the second encapsulation layer including at least one inorganic layer.