Resistive touch screen measurement system
US7643014B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2006 |
| Grant date | Jan 5, 2010 |
| Priority date | — |
| Expiry date | Mar 14, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A voltage is generated after a touch screen is touched, and the voltage is transformed into a digital signal for detecting a touch point which the touch screen is touched. A touch sensing system includes a first switch having a first node coupled to a first voltage source, a second switch having a node coupled to a second voltage source, a first resistor coupled between the first switch and the second switch in a series connection, a comparator having a first input node coupled to a second node of the first switch, a successive approximation register (SAR) having an input node coupled to an output node of the comparator, and a simulation circuit. An output voltage of the simulation circuit is continuously adjusted by the comparator and the simulation circuit to transform the voltage generated on the touch screen into a digital signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.