OLED Adhesive Layer Rounded Corners Crack Prevention
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Solution Overview
Problem
Existing organic light-emitting display devices are prone to crack formation in the adhesive layer at corner regions due to attachment pressure, leading to moisture penetration and reduced device lifespan.
Innovation Solution
The design incorporates rounded corner regions in the adhesive layer to control crack formation, preventing large cracks that could allow moisture to reach the active area, using materials like epoxy-based or acrylate-based compounds, and additional metallic connections to reduce signal delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If attachment pressure is applied to attach the first and second substrates, then the substrates are securely bonded, but cracks form in the adhesive layer at corner regions allowing moisture penetration
Solution Approach 1:
The corner regions of the adhesive layer are designed with rounded shapes instead of sharp corners. This curvature distributes the attachment pressure more evenly across the corner regions, preventing stress concentration that would otherwise cause crack formation. The rounded corners maintain adhesive integrity while preventing moisture penetration paths.
2Area of stationary object
If the adhesive layer is applied uniformly across the substrate, then complete coverage is achieved, but corner regions experience excessive stress concentration
Solution Approach 1:
The adhesive layer is designed with different geometrical properties at different locations. Specifically, the corner regions have rounded shapes while the central and side regions maintain their original geometry. This local modification optimizes stress distribution at critical corner regions without compromising the overall coverage and bonding function of the adhesive layer.
Data Source
AI summary
Disclosed is an organic light-emitting display device capable of preventing the occurrence of cracks at corner regions of an adhesive layer. The organic light-emitting display device includes a first substrate including a plurality of pixels and a second substrate. A thin film transistor (TFT) located at each pixel of the first substrate. A pixel electrode is also located at each pixel. An organic light-emitting unit that emits light is coupled to each pixel electrode. A common electrode is electrically coupled to each organic light-emitting unit. An adhesive layer is coupled to the common electrode. The adhesive layer attaches the first and second substrates. The corner regions of the adhesive layer are rounded in order to control the creation of cracks in the adhesive layer and thereby prevent moisture from entering the active area of the device.