Touch Electrode Segmentation for Foldable Display Bending
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Solution Overview
Problem
Flexible display devices with touch members face challenges in maintaining effective touch control during bending and folding due to the limitations in their resistance to mechanical stress, leading to potential disruptions in touch sensing and accuracy.
Innovation Solution
A touch member design featuring a bendable substrate with touch electrodes that are separated into disconnected sub-electrodes by bending regions, each driven by a signal line, ensuring continued functionality and accuracy during bending and folding. This design includes a flexible circuit board for signal connection, providing consistent sensing signals to sub-electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch electrodes are made continuous across the bending region, then touch sensing coverage is improved, but bending resistance deteriorates
Solution Approach 1:
The touch electrodes are divided into multiple disconnected sub-electrodes at the bending region. Each sub-electrode is independently driven by a signal line, allowing the electrode structure to flex without continuous stress while maintaining touch sensing capability across the entire display surface.
2Strength
If touch electrodes are separated into disconnected sub-electrodes, then bending resistance is improved, but device complexity increases
Solution Approach 1:
The electrode structure is segmented into sub-electrodes that align with the bending regions, creating a modular architecture where each segment can be independently managed by dedicated signal lines, simplifying the overall routing strategy.
Solution Approach 2:
The discontinuous electrode structure is specifically implemented at the bending regions where flexibility is needed, while maintaining continuous electrodes in non-bending areas. This localized approach optimizes bending resistance without unnecessarily increasing complexity across the entire display.
3Ease of manufacture
If bending regions are made wider, then ease of manufacture is improved, but touch sensing precision deteriorates
Solution Approach 1:
The bending region width is optimized by segmenting the electrodes into sub-electrodes that match the bending zone dimensions. This segmentation allows the bending regions to be sufficiently wide for manufacturability and flexibility while the discrete sub-electrodes maintain adequate spacing to preserve touch sensing precision.
Data Source
AI summary
A touch member and a display are provided. The touch member includes: a first substrate (100), a number of touch electrodes, and a number of signal lines. The first substrate includes at least one bendable bending area. The touch electrodes are disposed on at least one surface of the first substrate (100). At least some of the touch electrodes are separated into a number of disconnected touch sub-electrodes by the bending region. And each of the touch sub-electrodes is driven by a signal line.