Segmented Touch Electrode Layout for Flexible Display Reliability
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Solution Overview
Problem
Existing display devices face issues with touch failure, particularly in devices with flexible substrates, where the touch sensor layer is prone to damage and signal interference, leading to reduced reliability and functionality.
Innovation Solution
The display device incorporates a touch sensor layer with a specific electrode configuration, including first and second sensing electrodes extending in different directions, with sub-sensing electrodes spaced apart in a touch area, to enhance touch input detection and prevent failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor layer is used in flexible display devices, then touch input functionality is enabled, but the touch sensor layer becomes prone to damage and signal interference
Solution Approach 1:
The touch sensor layer is divided into multiple independent sensing electrodes (first sensing electrode and second sensing electrode) that are spaced apart from each other. This segmentation allows the touch sensor to maintain functionality even if one electrode is damaged, and reduces signal interference between adjacent electrodes.
Solution Approach 2:
The patent introduces a spatial dimension by arranging sensing electrodes in different directions (first direction and second direction intersecting at an angle). This dimensional arrangement improves touch detection accuracy and provides redundant detection paths, enhancing reliability in flexible configurations.
2Measurement precision
If sensing electrodes are placed close together to improve touch sensitivity, then detection accuracy improves, but signal interference between electrodes increases
Solution Approach 1:
The touch sensor is segmented into multiple independent sensing electrodes with spacing between them. This segmentation reduces capacitive coupling and signal interference between electrodes while maintaining adequate coverage for accurate touch detection.
Solution Approach 2:
Different regions of the touch sensor have locally optimized electrode configurations. The sensing electrodes are arranged with specific spacing and orientations in different areas to balance sensitivity and interference reduction based on local requirements.
3Adaptability or versatility
If the touch sensor layer is made flexible to enable bendable displays, then adaptability improves, but the touch sensor becomes more susceptible to damage
Solution Approach 1:
The touch sensor layer is divided into multiple independent sensing electrodes that can move and deform independently during bending. This segmentation reduces stress concentration and prevents catastrophic failure, allowing the flexible touch sensor to maintain functionality after bending cycles.
Solution Approach 2:
The spaced-apart electrode configuration provides inherent mechanical cushioning by allowing gaps to absorb bending stress. This prevents crack propagation and material failure in the flexible touch sensor layer during repeated bending operations.
Data Source
AI summary
A display device is provided. The display device includes a first sensing electrode extending in a first direction, the first sensing electrode including a first sub-sensing electrode and a second sub-sensing electrode spaced apart from each other in a touch area which senses a touch input; a second sensing electrode extending in a second direction intersecting the first direction, the second sensing electrode including a third sub-sensing electrode and a fourth sub-sensing electrode spaced apart from each other in the touch area; a first touch signal line connected to the first sub-sensing electrode and the second sub-sensing electrode; and a second touch signal line connected to the third sub-sensing electrode and the fourth sub-sensing electrode.