OLED Waveform Barrier Layer for Moisture Sealing Integrity
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Solution Overview
Problem
Conventional OLED display devices face reliability issues in preventing moisture permeation due to damage of the protruding barrier layer during the cleaning process after defining grooves, which compromises the effectiveness of hermetic sealing and reduces the lifespan of the device.
Innovation Solution
The OLED display device incorporates a flexible substrate with a groove that has an undercut shape and a protruding barrier layer with a waveform, which reduces the risk of damage during cleaning by distributing pressure more evenly, enhancing the sealing effectiveness and preventing moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove with undercut is used to prevent moisture permeation, then moisture sealing effectiveness is improved, but the protruding barrier layer is damaged during cleaning process
Solution Approach 1:
The barrier layer is designed with a waveform profile featuring multiple ridges and valleys instead of a straight protruding shape. This curved configuration distributes cleaning pressure across multiple contact points, preventing localized stress concentration that would damage a straight protruding barrier layer while maintaining the undercut groove's moisture sealing effectiveness.
Solution Approach 2:
The single protruding barrier layer is segmented into multiple ridges and valleys forming a waveform structure. This segmentation allows the cleaning pressure to be distributed across multiple segments rather than concentrated on one point, reducing the risk of damage during the cleaning process while preserving the hermetic sealing function.
2Ease of manufacture
If high-pressure water cleaning is used to remove residual materials, then cleaning effectiveness is improved, but the protruding barrier layer is damaged
Solution Approach 1:
The waveform configuration of the barrier layer with its ridges and valleys distributes the impact of high-pressure water cleaning across multiple contact points. This curved geometry prevents water pressure from concentrating on a single vulnerable point, allowing effective removal of residual materials while protecting the barrier layer from damage.
Solution Approach 2:
The waveform structure acts as a pre-designed cushioning mechanism that absorbs and distributes cleaning stresses before they can cause damage. The multiple ridges and valleys create a progressive deformation path that cushions the barrier layer against the full force of high-pressure water cleaning.
Data Source
AI summary
An organic light emitting display device includes: a flexible substrate having a groove that is undercut; a common layer disposed on the flexible substrate, including an organic light emitting layer, and disconnected by the groove; and a sealing member disposed on the common layer and covering the common layer. The flexible substrate includes a first substrate layer and a first barrier layer disposed on the first substrate layer. The first barrier layer protrudes with respect to the first substrate layer at the groove. The first barrier layer that protrudes has a waveform.