Touch sense interface circuit
US8599169B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 2011 |
| Grant date | Dec 3, 2013 |
| Priority date | — |
| Expiry date | Dec 24, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/044
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch sensing interface (101) includes a noise touch sensing circuit (110) that utilizes electromagnetic (EM) noise in a touch panel (102) to determine whether a pad of the touch panel is touched, such as by a finger of a user. The noise touch sensing circuit detects noise in a first pad (104) and in a second pad (105) of the touch panel, compares power of the noise in the first pad to power of noise in the second pad, and outputs a signal (132) indicative of the first pad being touched when power of noise in the first pad exceeds power of noise in the second pad by a pre-selected amount. The touch sensing interface may include a capacitive touch sensing circuit (120) and a controller (130) that selectively actuates the noise touch sensing circuit and the capacitive touch sensing circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.