Flexible Touch Substrate With Stacked Conductive Layers
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Solution Overview
Problem
Flexible touch displays face issues with uneven stress distribution leading to fractures in conductive film layers, reducing the yield and reliability of touch screen functionality due to pressure differences across the OLED display.
Innovation Solution
A touch substrate design featuring a flexible base substrate with a touch electrode layer, insulating layer, and conductive connection layer, where the touch electrode layer includes crosswise columns and rows with specific overlapping and coupling mechanisms via via-holes, reducing bending stress on the electrode layers and minimizing damage during flexure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch electrode patterns and conductive connection components are arranged in the same plane, then the touch display achieves simple structure and ease of manufacture, but the conductive function pattern is easily fractured under uneven stress during flexing
Solution Approach 1:
The patent transitions from a planar arrangement to a three-dimensional stacked arrangement where the conductive connection layer is positioned above the touch electrode layer. This vertical separation in the third dimension allows the conductive connections to bridge touch electrode patterns without being in the same plane, reducing stress concentration and fracture risk during flexing while maintaining manufacturing feasibility through sequential layer deposition
2Adaptability or versatility
If the touch display is made flexible to meet application scenario needs, then the display achieves adaptability and versatility, but uneven stress distribution causes conductive patterns to fracture
Solution Approach 1:
The patent segments the conductive connection structure into multiple independent components: touch electrode patterns in the touch electrode layer, via-holes for vertical connection, and conductive connection components in the conductive connection layer. This segmentation allows each component to independently accommodate stress during flexing, preventing catastrophic failure of the entire conductive network while maintaining flexibility for various application scenarios
3Volume of moving object
If conductive connection components are placed closer to the flexible base substrate, then the structure achieves compactness and reduced material usage, but the conductive patterns experience higher stress and fracture risk during bending
Solution Approach 1:
Instead of placing conductive connection components in the same plane as touch electrode patterns (horizontal arrangement), the patent positions them in a vertical stack above the touch electrode layer. This vertical arrangement in the third dimension creates spatial separation that reduces stress transmission to the conductive patterns during bending, while the compact stacked structure minimizes overall volume consumption
Data Source
AI summary
A touch substrate, a method of forming the same, and a touch display device are provided. A touch substrate is provided, including: a flexible base substrate; and a touch electrode layer, an insulating layer and a conductive connection layer stacked in a direction away from the flexible base substrate. The conductive connection layer includes a plurality of second conductive connection components; the touch electrode layer includes touch electrode columns and touch electrode rows arranged crosswise and insulated from each other; each of the touch electrode columns includes a plurality of first touch electrode patterns arranged in a column direction, two adjacent first touch electrode patterns in an identical touch electrode column are coupled via a first conductive connection component in the touch electrode layer.