Display Insulating Layer Layout to Block Peripheral Crack Propagation
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Solution Overview
Problem
Display devices, such as those in smartphones and tablets, often experience image display issues due to cracks in the display area during manufacturing or use, which can lead to defects in the image display.
Innovation Solution
A display device design featuring a substrate with an indented boundary and non-continuous insulating layers in the peripheral area, including a first and second insulating layer with overlapping non-continuous areas, a dummy pad with a non-continuous portion, and an additional insulating layer covering the dummy pad, all formed from inorganic materials, to prevent cracks from extending into the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous insulating layer is formed over the substrate including the peripheral area, then the insulating coverage is improved, but cracks may propagate from the peripheral area into the display area
Solution Approach 1:
The insulating layer is divided into a first insulating layer and a second insulating layer, with the second layer having non-continuous areas that overlap with the first layer. This segmentation prevents cracks from propagating continuously through the insulating structure while maintaining overall insulating coverage.
Solution Approach 2:
The insulating layer has different structural properties in different regions: it is continuous in the display area to maintain image quality, and non-continuous in the peripheral area to prevent crack propagation. This local differentiation allows the structure to serve multiple protective functions simultaneously.
2Adaptability or versatility
If the substrate boundary is indented toward the display area, then the structural design flexibility is improved, but the area available for insulating layer coverage is reduced
Solution Approach 1:
The solution addresses the reduced coverage area by adding a vertical dimension through multiple overlapping insulating layers. The non-continuous areas of the second insulating layer overlap with the first insulating layer, providing sufficient insulating coverage despite the indented boundary reducing the horizontal area.
3Reliability
If multiple overlapping insulating layers are used with non-continuous areas, then crack propagation prevention is improved, but the device structure becomes more complex
Solution Approach 1:
The first and second insulating layers are merged in regions where their non-continuous areas overlap, creating a combined insulating structure that prevents crack propagation. This merging approach reduces the number of separate components needed while maintaining the crack resistance function.
4Object-affected harmful factors
If the insulating layer is made non-continuous in the peripheral area, then crack propagation into the display area is prevented, but the insulating coverage in the peripheral area is reduced
Solution Approach 1:
The non-continuous areas of the second insulating layer are positioned to overlap with the first insulating layer in advance, creating a predetermined crack propagation barrier before cracks can reach the display area. This preliminary structural arrangement ensures crack prevention while maintaining adequate insulating coverage.
Data Source
AI summary
A display device is disclosed. In one aspect, the display device includes a substrate including a display area and a peripheral area adjacent to the display area. The display device also includes a plurality of display elements disposed in the display area. The display device also includes an insulating layer disposed in the display area and the peripheral area, wherein the insulating layer has a non-continuous area disposed in the peripheral area of the substrate.