Light coupling in TIR-based optical touch systems
US10146376B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2015 |
| Grant date | Dec 4, 2018 |
| Priority date | — |
| Expiry date | Feb 27, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04109
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch-sensitive apparatus operates by light frustration (FTIR) and comprises a light transmissive panel that defines a front surface and a rear surface, a light emitter optically connected to the panel so as to generate light that propagates by total internal reflection inside the panel, and a light detector optically connected to the panel to receive propagating light from the emitter. The emitter is a VCSEL array including a number of VCSELs driven to collectively form one light emitter, and a light coupling mechanism connecting the emitter to the panel is configured to give light from a plurality of the VCSELs in the VCSEL array substantially the same spread in the panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.