Display Panel Planarization Layer Gas Release and Moisture Protection
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Solution Overview
Problem
In the manufacturing of organic light-emitting display panels, gases released during the process need to be efficiently outgassed to prevent irregularities, and external moisture must be prevented from penetrating the substrate array layer.
Innovation Solution
A display panel design featuring a planarization layer with an electrode pattern in the non-display area that exposes part of the planarization layer for gas release, combined with a moisture-impermeable layer covering the exposed area to prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the planarization layer is fully covered to prevent moisture penetration, then moisture protection is improved, but gas release during manufacturing is hindered
Solution Approach 1:
The patent applies local quality by creating different regions with different properties: the electrode pattern in the non-display area has openings that expose the planarization layer for gas release, while the display area maintains full coverage for moisture protection. This localized differentiation allows each region to serve its specific function optimally.
Solution Approach 2:
The patent segments the substrate into display area and non-display area, with the electrode pattern specifically positioned in the non-display area. This segmentation allows the gas release function to be isolated to a specific region without compromising the moisture protection in the display area.
2Ease of manufacture
If the planarization layer is exposed for gas release, then manufacturing is improved, but moisture penetration risk increases
Solution Approach 1:
The moisture-impermeable layer is applied locally only to the exposed planarization layer in the non-display area, creating a localized protective barrier. This ensures moisture protection is provided exactly where needed (at the gas release openings) without requiring full coverage that would hinder gas release.
Solution Approach 2:
The moisture-impermeable layer acts as an intermediary element between the exposed planarization layer and the external environment. It mediates the contradiction by allowing the planarization layer to remain exposed for gas release while simultaneously preventing moisture penetration through the same exposed areas.
3Reliability
If a moisture-impermeable layer is added to cover exposed areas, then moisture protection is improved, but device complexity increases
Solution Approach 1:
The moisture-impermeable layer is applied selectively only to the exposed planarization layer in the non-display area rather than covering the entire substrate. This localized application reduces the overall complexity compared to a full-coverage approach while still providing the necessary moisture protection at critical locations.
Data Source
AI summary
A display panel comprises: a planarization layer that lies on a substrate and compensates for irregularities; an electrode pattern that lies on the planarization layer in a non-display area of the substrate and exposes at least part of the planarization layer; and a moisture-impermeable layer that covers the planarization layer exposed by the electrode pattern.