Optical touch detection using input and output beam scanners
US8542217B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2009 |
| Grant date | Sep 24, 2013 |
| Priority date | — |
| Expiry date | Sep 3, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04109
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus is controlled to detect a location of an object on a touch surface of a panel. An input scanner arrangement introduces at least two beams of radiation into the panel for propagation by internal reflection, and sweeps the beams inside the panel across a sensing area. An output scanner arrangement is synchronized with the input scanner arrangement so as to receive the beams from the input scanner arrangement while they are swept across the sensing area and to direct the beams onto at least one radiation detector. Thereby, each beam is introduced and received on opposite ends of the sensing area. A data processor is connected to the radiation detector and operated to identify the location based on an attenuation of the beams caused by the object touching the touch surface within the sensing area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.