Augmented optical waveguide for use in an optical touch sensitive device
US9405382B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2013 |
| Grant date | Aug 2, 2016 |
| Priority date | — |
| Expiry date | Dec 2, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04109
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical touch-sensitive device is able to determine the locations of multiple simultaneous touch events. The optical touch-sensitive device includes multiple emitters and detectors coupled with an optical coupler assembly through a waveguide on the surface on the optical-touch sensitive device. Each emitter produces optical beams which propagate in the waveguide via total internal reflection and are received by the detectors. Touch events disturb the optical beams, and are determined based on the disturbances. The optical touch-sensitive device further includes an intermediate layer interposed between the waveguide and a display surface. The intermediate layer preserves optical beam propagation in the waveguide and is transparent to visible light. The optical touch-sensitive device may further include at least one frame zone, at least one dead zone, and/or at least one fixed graphics zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.