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Capacitance Characteristics of Glass-Embedded Interdigitated Capacitors for Touch Sensing Applications
Apichart Kaewcharoen1,2, Kirote Arpanutud3, Prayoot Akkaraekthalin4
1High Frequency Systems Laboratory, King Mongkut's University of Technology North Bangkok, Bangkok 10800, Thailand.
Sensors (Basel, Switzerland)
|November 27, 2025
Summary
This study explores glass-embedded interdigitated capacitive sensors (IDCS) for touch sensing. Wider electrodes enhance touch sensitivity and uniformity in smart-glass applications.
Area of Science:
- Materials Science
- Electrical Engineering
- Human-Computer Interaction
Background:
- Interdigitated capacitive sensors (IDCS) are crucial for touch-sensing interfaces.
- Optimizing electrode geometry is key for performance in smart-glass applications.
Purpose of the Study:
- Investigate capacitance characteristics of glass-embedded IDCS for touch sensing.
- Analyze baseline and touch-induced capacitance variations.
- Provide guidelines for optimizing electrode geometry.
Main Methods:
- Developed a multilayer analytical model for baseline capacitance calculation.
- Utilized experimental validation with sensor prototypes.
- Employed an equivalent circuit model for the touched state.
Main Results:
- Baseline capacitance decreased with increasing electrode width (28.6 pF to 12 pF).
- Touch-induced capacitance change ranged from 0.6-0.9 pF.
- Touch sensitivity increased with electrode width (1.7-4.6% to 5-7.6%).
Conclusions:
- Narrower electrodes yield higher absolute capacitance.
- Wider electrodes improve touch sensitivity and uniformity.
- The proposed IDCS configuration is practical for glass-integrated touch sensors.
Keywords:
capacitance modelingequivalent circuit modelingglass-embedded structureinterdigitated capacitive sensortouch sensingMore Related Videos
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