Ohmic-Sticker: Force-to-Motion Type Input Device that Extends Capacitive Touch Surface
summary
A paste-on, battery-less sensor less than 2 mm thick converts fingertip force into a measurable shunt current on existing capacitive touchpads using Ohmic-Touch, with an FSR stack (PCB, double-sided tape, conductive film, rubber cap) that moves resistance from ~100 MΩ down to ~10 Ω. Device-grounding and a shear-impedance above roughly 30 kΩ avoid adaptive-filter dropouts. Software maps current to cursor speed achieving about 79% of TrackPoint throughput, and prototypes show 0.5, 2.5 and 6 DoF controllers, smartphone back and HMD use.
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chapters (8)
- 0:00Introduction to Ohmic-Sticker
- 1:53TrackPoint limitations and motivation
- 3:02Ohmic-Sticker concept and structure
- 5:48Design requirements and grounding
- 10:38Force-to-speed mapping and evaluation
- 12:53Applications and use cases
- 14:25Compatibility and interference
- 15:31Conclusion and Q&A
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