Flexible Touch Panel Bending Region Crack Prevention
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Solution Overview
Problem
Touch panels, especially capacitive types, face durability issues and cracking when bent, leading to defects and performance degradation, particularly in flexible and foldable display devices.
Innovation Solution
A flexible touch panel design with distinct conductive patterns in flat and bending regions, where the bending region patterns have a smaller width than those in the flat region, and include auxiliary electrodes to reduce tension and prevent cracking, while maintaining touch sensitivity and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch panel is bent to enable flexible display, then adaptability is improved, but cracks occur in the touch panel reducing reliability
Solution Approach 1:
The patent applies local quality by differentiating the conductive pattern dimensions between the bending region and flat region. Specifically, the conductive patterns in the bending region have smaller dimensions than those in the flat region, allowing the panel to flex without cracking while maintaining touch functionality.
2Reliability
If the conductive pattern width is reduced in the bending region, then cracking is prevented, but touch sensitivity may be affected
Solution Approach 1:
The patent employs parameter changes by systematically varying the conductive pattern dimensions across different regions. The bending region uses smaller conductive pattern dimensions to prevent cracking during flexing, while the flat region maintains larger dimensions for optimal touch sensitivity, thus balancing both requirements through spatial parameter variation.
Data Source
AI summary
A flexible touch panel having a bending region which is bendable and a flat region, includes: a plurality of first unit conductive patterns formed in the flat region; and a plurality of second unit conductive patterns formed in the bending region, and the second unit conductive pattern has a smaller width than the first unit conductive pattern.