Display Apparatus Encapsulation with Differential Opening Sizes
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Solution Overview
Problem
Existing display apparatuses face defects due to cracks in the encapsulation layer around electrode power supply lines, allowing moisture and oxygen to infiltrate and affect display devices, particularly at disconnected portions where impurities can easily spread along the lines.
Innovation Solution
The display apparatus incorporates a substrate with a peripheral area featuring a first and second conductive layer, insulating layers with specific openings, and a third conductive layer, where the second opening is smaller than the first, reducing the risk of crack formation and impurity infiltration by ensuring consistent thickness and coverage of the conductive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encapsulation layer is provided around electrode power supply lines, then protection against moisture and oxygen is improved, but cracks form in the encapsulation layer allowing impurity infiltration
Solution Approach 1:
The patent applies different opening sizes at different locations of the encapsulation layer. The first opening (at the connected portion) has a larger area while the second opening (at the disconnected portion) has a smaller area. This local differentiation allows the encapsulation layer to provide adequate protection where needed while minimizing stress concentration and crack formation at vulnerable disconnected portions.
2Manufacturing precision
If the conductive layers are made with consistent thickness, then manufacturing precision is improved, but device complexity increases due to multiple insulating layers with specific openings
Solution Approach 1:
The encapsulation structure is segmented into multiple insulating layers (first insulating layer and second insulating layer) with different opening configurations. The first insulating layer has a first opening exposing a first upper surface of the first conductive layer, while the second insulating layer has a second opening exposing a second upper surface of the second conductive layer. This segmentation allows independent optimization of each layer's thickness and opening size, achieving consistent conductive layer thickness while managing the complexity through modular design.
Data Source
AI summary
A display apparatus including a first conductive layer; a first insulating layer including a first opening exposing a first upper surface of the first conductive layer and covering at least a part of an upper edge of the first conductive layer, wherein the first upper surface of the first conductive layer includes a center portion of an upper surface of the first conductive layer; a second conductive layer on a part of the first upper surface of the first conductive layer and on the first insulating layer; and a second insulating layer including a second opening exposing a second upper surface of the second conductive layer and covering a part of an upper edge of the second conductive layer, wherein the second upper surface of the second conductive layer includes a center portion of the upper surface of the second conductive layer.