Flexible Touch Electrode Segmentation for Stress Distribution
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Solution Overview
Problem
Flexible touch display technologies face challenges in maintaining bending resistance and preventing issues like breakage, peeling off, and warpage due to stress concentration during bending, particularly in areas with continuous strip electrodes.
Innovation Solution
The touch structure incorporates sub-touch electrodes arranged on both sides of insulating layers with via holes for electrical connection, and varying lengths in bending areas to distribute stress, improving bending resistance by alternating electrode arrangements and reducing stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous strip electrodes are used in flexible touch displays, then electrical connection is improved, but stress concentration during bending occurs leading to breakage and peeling off
Solution Approach 1:
The continuous strip electrodes are segmented into multiple sub-electrodes arranged in an alternating pattern on opposite sides of the insulating layer. This segmentation breaks the continuous stress path, allowing the structure to flex without concentrating stress at single points, thereby preventing breakage and peeling while maintaining electrical connectivity through the alternating electrode arrangement
Solution Approach 2:
The electrode structure transitions from a single-plane continuous strip to a multi-dimensional alternating pattern across opposite sides of the insulating layer. This dimensional change distributes stress across multiple planes and depths, enabling the flexible display to withstand bending forces while maintaining electrical connection integrity
2Strength
If electrodes are arranged on both sides of insulating layer with via holes, then bending resistance is improved, but device complexity increases
Solution Approach 1:
The electrode system is segmented into alternating sub-electrodes on opposite sides of the insulating layer, connected through via holes. This segmentation approach distributes mechanical stress across multiple discrete elements rather than a continuous structure, significantly improving bending resistance while the modular via-hole connection system manages the complexity through standardized vertical interconnections
Solution Approach 2:
The alternating electrode structure embeds multiple electrode segments within the thickness of the insulating layer, with via holes providing vertical nesting connections. This nested arrangement allows complex multi-layer electrode patterns to be compacted into a thin profile, improving bending resistance without proportionally increasing overall device complexity
Data Source
AI summary
A touch structure has a bending area and a non-bending area, and the bending area has a first center line parallel to a first direction. The touch structure includes: a plurality of first touch electrodes extending in the first direction and sequentially arranged in a second direction, and a first insulating layer. At least a portion of a first touch electrode located in the bending area includes first sub-touch electrodes; and the first direction intersects with the second direction. The first insulating layer has a plurality of via holes. Among the first sub-touch electrodes included in the first touch electrode, any two adjacent first sub-touch electrodes are located on two opposite sides of the first insulating layer, and any two adjacent first sub-touch electrodes are electrically connected through at least one via hole in the first insulating layer.