OLED Display Panel Layered Protection Structure for Vapor Seal
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Solution Overview
Problem
Conventional OLED display panels have a poor seal effect, leading to vapor intrusion and premature aging, resulting in a short service life.
Innovation Solution
A display panel design with a TFT array substrate, an OLED array, a package layer, an upper protection layer, and a lower protection layer, where specific projections and distances between these layers prevent vapor intrusion, enhancing the seal effect and extending the panel's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional package structure is used, then the device complexity is low, but the seal effect is poor leading to vapor intrusion and short service life
Solution Approach 1:
The package structure is divided into multiple protection layers (first protection layer, second protection layer, third protection layer) with distinct functions. Each layer provides specific protection against vapor intrusion, and the layered segmentation allows for better sealing performance while distributing the protective function across multiple components rather than relying on a single complex structure.
Solution Approach 2:
The patent extends the protection in the vertical direction by adding multiple protection layers stacked above the OLED array. The first protection layer covers the OLED array, the second protection layer covers the first protection layer, and the third protection layer covers the second protection layer. This vertical dimensionality change provides enhanced seal effect and prevents vapor intrusion from multiple angles.
2Reliability
If the package layer is made larger to improve sealing, then the seal effect improves, but the area of the display panel increases
Solution Approach 1:
Each protection layer is designed with locally optimized dimensions and positions. The first protection layer has a first area, the second protection layer has a second area, and the third protection layer has a third area. Each layer is positioned to provide optimal local protection where needed, rather than uniformly increasing the area of all layers. This allows for effective sealing while controlling the overall panel area.
Solution Approach 2:
The protection layers are arranged in a nested configuration where the second protection layer covers the first protection layer, and the third protection layer covers the second protection layer. This nesting arrangement provides enhanced sealing effect through overlapping layers while efficiently utilizing the vertical space, avoiding unnecessary horizontal area expansion.
Data Source
AI summary
A display panel and a method for fabricating the same are provided. The display panel includes: a TFT array substrate; an OLED array disposed on the TFT array substrate, a package layer which covers the OLED array, an upper protection layer covering the package layer, and a lower protection layer. In a first direction, a first projection of the OLED array on the TFT array substrate is located within a second projection of the package layer on the TFT array substrate, and there is a first distance between a boundary of the first projection and a boundary of the second projection. Also in the first direction, the second projection is located within a third projection of the upper protection layer on the TFT array substrate, and there is a second distance between the boundary of the second projection and a boundary of the third projection.