Touch Substrate Electrode Segmentation for Foldable Display Grounding
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Solution Overview
Problem
Outer folding screens experience poor grounding signals and false touches due to the interference between the user's hand and the touch substrate when in a bent state, leading to inconsistencies in touch reporting and user experience.
Innovation Solution
A touch substrate design with distinct regions featuring first and second non-bent regions and a bent region, where the touch electrode structures include emission and receiving electrodes arranged in specific configurations to prevent interference, ensuring proper grounding and accurate touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the touch substrate uses a continuous receiving electrode group extending from the first non-bent region to the second non-bent region via the bent region, then the touch detection coverage is improved, but the user's hand interference causes false touch and position offset
Solution Approach 1:
The receiving electrode group is divided into a first receiving electrode group in the first non-bent region and a second receiving electrode group in the second non-bent region, separated by a bent region. This segmentation prevents the user's hand from simultaneously contacting both regions, eliminating the interference that causes false touch and position offset while maintaining comprehensive touch detection coverage in each respective region.
2Adaptability or versatility
If the outer folding screen is in a bent state during split-screen display, then the display versatility is improved, but the grounding signals become poor and touch reporting fails
Solution Approach 1:
The touch substrate is designed with different electrode group configurations in different regions: the first emission electrode group and first receiving electrode group are configured in the first non-bent region, while the second emission electrode group and second receiving electrode group are configured in the second non-bent region. This local differentiation ensures that each region can independently function during bent state operations, maintaining reliable touch reporting and grounding signals for each display region regardless of the overall device bending state.
3Reliability
If the user's hand touches the receiving electrode group in the second non-bent region while the touch finger touches the first non-bent region, then the grounding path is improved, but the sensing amount is enhanced causing sensed position offset
Solution Approach 1:
The receiving electrode group is segmented into separate first and second receiving electrode groups located in different non-bent regions, with the bent region acting as a physical separator. This segmentation ensures that when a user's touch finger contacts one region and the other hand contacts the other region, each electrode group independently detects touches in its own region without cross-interference, preventing the sensing amount enhancement that causes position offset while maintaining reliable grounding through each separate contact path.
Data Source
AI summary
A touch substrate and a manufacturing method therefor, and a touch display device and a control method therefor. The touch substrate comprises a base substrate and a touch electrode structure. The touch substrate comprises a bendable region, and a first non-bendable region and a second non-bendable region adjacent to the bendable region. The touch electrode structure comprises a first touch electrode structure located in the first non-bendable region, and a second touch electrode structure located in the second non-bendable region. The first touch electrode structure comprises a plurality of first transmitter electrode groups and a plurality of first receiver electrode groups. The second touch electrode structure comprises a plurality of second transmitter electrode groups and a plurality of second receiver electrode groups. The bendable region comprises at least a first receiver electrode and a second receiver electrode.