Capacitive touch sensor
US5650597A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 20, 1995 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | Jan 20, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0443
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a capacitive touch sensor including a plurality of horizontal sensor bars arranged in a single direction. The touch sensor preferably receives differential sensor signals from the sensor array to reduce proximity effects and noise associated with conventional capacitive touch sensors. The touch sensor also utilizes an isolation circuit or floating interface to reduce the effects of external interference and increase the accuracy of touch sensing and localization. The bars are preferably comprised of indium tin oxide oriented in the machine direction of roll for superior linearity. The touch sensor may be utilized with display screens having thick dielectrics and also eliminates the need for a rear guard layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.