Touch surface with a compensated signal profile
US8692807B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2010 |
| Grant date | Apr 8, 2014 |
| Priority date | — |
| Expiry date | Feb 23, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04109
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus, method and computer-readable medium for determining a location of at least one object on a touch surface of a light transmissive panel. The method comprises the steps of: introducing light into the panel for propagation by internal reflection between the touch surface and an opposite surface; receiving the light propagating in the panel; and iteratively i) determining a current signal profile of light received by the light detection arrangement, ii) updating, when a condition is met, a background signal profile of light received by the light detection arrangement, iii) calculating a current compensated signal profile as a function of the background signal profile and the current signal profile and iv) determining, when the object touches the touch surface and thereby attenuates the light propagating in the panel, the location as a function of the compensated signal profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.