Touch sensing
US9323396B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2010 |
| Grant date | Apr 26, 2016 |
| Priority date | — |
| Expiry date | May 6, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04109
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A touch-screen device includes an imaging waveguide, in which the imaging waveguide has a radiation receiving surface and an imaging surface different than the radiation receiving surface. The imaging waveguide is configured to receive, at the radiation receiving surface, radiation emitted by a contact receiving structure, and transmit the received radiation from a position on the radiation receiving surface to a position and/or angle of incidence on the imaging surface as a function of the position on the radiation receiving surface at which the transmitted radiation was received. An imaging sensor coupled to the imaging surface of the imaging optical waveguide is configured to detect radiation incident upon the imaging surface of the imaging optical waveguide. A processing device coupled to the imaging sensor is configured to determine contact points on the exposed contact surface of a contact receiving structure based on radiation detected by the imaging sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.