OLED Touch Panel Moisture Permeation Mitigation
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Solution Overview
Problem
OLEDs with on-cell or in-cell type touch panels face reliability issues due to moisture permeation through touch contact holes located near the cell end line, which affects the device's durability and performance.
Innovation Solution
The OLED design features touch contact holes arranged in a straight line at uniform distances from the cell end line, both in the display and non-display areas, with a touch panel structure that includes upper and lower electrodes and a protective layer to prevent moisture infiltration, enhancing the device's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch contact holes are located near the cell end line to enable on-cell or in-cell type touch panel integration, then the touch panel and display panel can be integrated providing elaborate user interface, but moisture permeation through these contact holes reduces device reliability
Solution Approach 1:
The patent applies local quality by making the distances of touch contact holes from the cell end line non-uniform specifically in the region near the cell end line, while maintaining uniform distances in other regions. This localized modification addresses the moisture permeation issue at the critical cell end line area without affecting the overall touch panel functionality elsewhere.
Solution Approach 2:
Instead of maintaining uniform distances for all touch contact holes as in conventional designs, the patent inverts the approach by intentionally creating non-uniform distances for contact holes near the cell end line. This inversion of the uniform distance principle specifically targets the problematic area to reduce moisture permeation while preserving touch panel integration benefits.
2Ease of manufacture
If touch contact holes are positioned at different distances from the cell end line, then the touch panel can be fabricated with standard processes, but contact holes near the cell end line are more susceptible to moisture permeation
Solution Approach 1:
The patent applies local quality by making the distances of touch contact holes from the cell end line non-uniform specifically in the region near the cell end line, while maintaining uniform distances in other regions. This localized modification addresses the moisture permeation issue at the critical cell end line area without affecting the overall touch panel functionality elsewhere.
Solution Approach 2:
The patent changes the geometric parameter (distance from cell end line) of touch contact holes in a localized manner. By adjusting the distance parameter differently for contact holes near the cell end line compared to those in other regions, the patent reduces moisture permeation susceptibility while maintaining manufacturability.
Data Source
AI summary
Provided is an organic electroluminescent device (OLED) having a display area and a non-display area outside the display area that may include an OLED panel including a plurality of organic light-emitting diodes in a cell end line of the display area on an array substrate; and a touch panel on the OLED panel, the touch panel including a plurality of touch contact holes in the non-display area, wherein at least two of the plurality of touch contact holes that are immediately adjacent to the cell end line have substantially the same distance from the cell end line, and method for fabricating the same.