Display Device Lead Wiring for Capacitance Balance
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Solution Overview
Problem
Wearable display devices face challenges in achieving balanced touch detection sensitivity across detection electrodes due to varying fringe capacitances caused by lead wiring configurations, leading to complex adjustment processes and potential operational inefficiencies.
Innovation Solution
The implementation of a lead wiring configuration where first lead wiring lines extend along boundary parts between detection electrodes, equalizing fringe capacitance influences and ensuring symmetrical capacitance across detection electrodes, thereby simplifying the adjustment process and improving touch detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead wiring lines are extended to peripheral areas for common electrode connection, then electrical connectivity is improved, but fringe capacitance varies across detection electrodes causing touch detection inaccuracy
Solution Approach 1:
The lead wiring lines are configured with asymmetric routing patterns where lines connecting to different detection electrodes follow different paths. Specifically, lead wiring lines extend along boundary parts between detection electrodes in a controlled asymmetric manner that compensates for capacitance variations, ensuring that each detection electrode experiences substantially equal fringe capacitance influence despite the asymmetric routing.
Solution Approach 2:
The lead wiring lines are designed to create equipotential conditions across all detection electrodes by extending along boundary parts between adjacent detection electrodes. This configuration ensures that the electric potential distribution remains balanced, resulting in substantially equal capacitance values for all detection electrodes despite their different positions in the peripheral area.
2Adaptability or versatility
If detection electrodes are arranged in peripheral areas surrounding display area, then touch detection coverage is improved, but capacitance balance across electrodes deteriorates due to varying lead wiring influences
Solution Approach 1:
The lead wiring configuration is segmented into multiple independent lines, each specifically routed to connect to individual detection electrodes or groups of electrodes. Each lead wiring line is designed as a separate entity that can be independently optimized to achieve balanced capacitance influence on its associated detection electrode(s), while collectively providing comprehensive touch detection coverage across the peripheral area.
Solution Approach 2:
The lead wiring lines act as intermediary elements between the common electrode and the detection electrodes arranged in the peripheral area. By positioning these lead wiring lines along boundary parts between detection electrodes, they serve as mediators that distribute electrical connections in a manner that balances the capacitance influence on each detection electrode, enabling both wide coverage and capacitance balance.
3Ease of manufacture
If lead wiring lines connect common electrode to peripheral detection electrodes, then electrical connectivity is improved, but adjustment process complexity increases due to capacitance variations
Solution Approach 1:
The lead wiring line configuration is designed with specific geometric parameters and routing patterns that inherently balance the capacitance values across all detection electrodes. By carefully controlling parameters such as line width, length, and positioning along boundary parts between detection electrodes, the design achieves substantially equal capacitance influence without requiring complex post-manufacturing adjustment processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration equalizes capacitance across detection electrodes, simplifying the adjustment process and enhancing touch detection accuracy and operability in wearable display devices.
Implementation Method 1
A capacitance formed between the first lead wiring line and the first detection electrode is substantially equal to a capacitance formed between the first lead wiring line and the second detection electrode
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate opposed to the first substrate, detection electrodes provided to surround a display area where an image is displayed, and a common electrode provided over an entire surface of the display area. The common electrode includes a first lead wiring line that extends to a peripheral area around the display area, along a boundary part between a first detection electrode, which is one of the detection electrodes, and a second detection electrode adjacent to the first detection electrode. A capacitance formed between the first lead wiring line and the first detection electrode is substantially equal to a capacitance formed between the first lead wiring line and the second detection electrode.