Touch Substrate Insulating Patterns for Flexible Display Stress Relief
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Solution Overview
Problem
Existing touch substrates fail to release stress generated by bending, leading to insulation layer cracks and subsequent failure of touch and display functions when attached to flexible circuit boards.
Innovation Solution
A touch substrate design featuring a base substrate with touch electrodes, a touch electrode bridge, and insulating patterns made of different materials, arranged to allow stress release through gaps between them, preventing cracks during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch substrate is attached to the flexible circuit board, then the touch substrate can be integrated with the display device, but the stress generated by bending causes the insulation layer to break
Solution Approach 1:
The insulation layer is segmented into multiple separate insulating patterns instead of a continuous layer. These segmented patterns are arranged with gaps between them, allowing the structure to flex and release stress during bending while maintaining electrical insulation functionality.
Solution Approach 2:
The insulating patterns are designed as thin film structures that can flex and deform elastically during bending. The gaps between patterns allow the thin films to move relative to each other, accommodating the bending stress without causing layer delamination or crack propagation.
2Reliability
If the insulation layer is made continuous to ensure complete coverage, then insulation performance is improved, but stress concentration during bending causes cracks
Solution Approach 1:
The continuous insulation layer is divided into discrete insulating patterns arranged in an array. This segmentation reduces stress concentration by allowing each pattern to move independently during bending, preventing crack propagation that would occur in a continuous layer.
Solution Approach 2:
Different regions of the substrate have different structural characteristics - the insulating patterns provide localized insulation where needed, while the gaps between patterns provide stress relief zones. This local variation in structure optimizes both insulation performance and bending resistance.
Data Source
AI summary
The present disclosure provides a touch substrate, a method for preparing the same, and a touch display device. The touch substrate includes: a base substrate; a plurality of touch electrodes located on the base substrate; a touch electrode bridge located on the base substrate and configured to connect the plurality of touch electrodes; and a plurality of first insulating patterns located on a surface of the touch electrode bridge away from the base substrate, in which the plurality of first insulating patterns is arranged in such a manner that adjacent first insulating patterns are separated from each other; and a plurality of second insulating patterns each located between the adjacent first insulating patterns, wherein the first insulating patterns and the second insulating patterns are made of different materials. The touch substrate according to the present disclosure has a high yield.