Digital signal processed touchscreen system
US7714846B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 25, 2005 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Feb 6, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0444
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Digital signal processed touchscreen system. The invention employs amplitude ramped signals across a touchscreen. The pattern to which the amplitude ramped electric signals are provided may be located on the surface of the touchscreen, or alternatively on the backside of the touchscreen. The signal processing employed by the invention, using digital signal processing techniques, is operable to discern a user's touch and to determine its location. A dielectric, protective surface is used to enable implementation into a wide variety of applications, including those applications that are environmentally rugged and have, until now, been too rugged for prior art touchscreen systems. The invention employs a user generated unbalanced capacitive load generated on the touchscreen to identify the location of the user's touch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.