Foldable Display Wiring Layout for Bridge-Island Reliability
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Solution Overview
Problem
Existing flexible display devices face challenges in preventing damage during deformation, such as bending or folding, which can lead to structural integrity issues and potential failure of electrical connections.
Innovation Solution
The display device incorporates a specific layered structure with conductive layers and insulating layers, including bridge portions and island portions, designed to accommodate deformation while maintaining electrical connectivity through optimized wiring configurations and insulating thickness variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is made flexible to enable folding or bending, then adaptability and form factor versatility are improved, but structural integrity and electrical connection reliability deteriorate during deformation
Solution Approach 1:
The conductive layers are divided into multiple segments corresponding to island portions and bridge portions. The bridge portions are segmented to allow deformation while the island portions maintain electrical connectivity, resolving the contradiction between flexibility and electrical connection reliability during folding or bending
Solution Approach 2:
Different regions of the conductive layers are designed with different properties: bridge portions are designed to be deformable while island portions maintain stable electrical connections. This local differentiation allows the device to be flexible overall while maintaining reliable electrical connections in critical areas
2Reliability
If the conductive layers are made thicker to improve electrical conductivity, then electrical performance is improved, but flexibility and ability to withstand deformation deteriorate
Solution Approach 1:
The conductive layers have varying thicknesses in different regions: thicker in island portions for stable electrical performance and thinner in bridge portions for enhanced flexibility and deformability, resolving the contradiction between electrical performance and flexibility
Solution Approach 2:
The conductive layers are formed as composite structures with multiple materials having different properties, combining materials that provide both good electrical conductivity and flexibility, allowing the layers to maintain electrical performance while withstanding deformation
3Reliability
If the insulating layer thickness is increased to prevent electrical shorting during deformation, then electrical isolation reliability is improved, but device thickness and flexibility deteriorate
Solution Approach 1:
The insulating layer has different thicknesses in different regions: thicker in bridge portions where deformation occurs to prevent electrical shorting, and thinner in island portions to maintain flexibility, resolving the contradiction between electrical isolation reliability and flexibility
Solution Approach 2:
The insulating layer is segmented into different thickness zones corresponding to bridge and island portions, allowing optimized electrical isolation in deformation-prone areas while maintaining overall device flexibility in functional areas
Data Source
AI summary
A display device includes a substrate including an island portion, a first bridge portion extending from the island portion in a first direction, and a second bridge portion extending from the island portion in a second direction crossing the first direction, a first conductive layer disposed on the substrate and including a first voltage line extending from the island portion to the first bridge portion and the second bridge portion, a second conductive layer disposed on the first conductive layer and including signal lines extending from the island portion to the first bridge portion and a data line extending from the island portion to the second bridge portion, and a third conductive layer disposed on the second conductive layer and including a second voltage line and a third voltage line, which extend from the island portion to the first bridge portion and the second bridge portion, respectively.