Integrated light guide and touch screen frame and multi-touch determination method
US9207800B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 2015 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | Jan 2, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04104
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch screen assembly including a glass screen, LEDs, photo diodes, a transparent plastic frame surrounding the screen, and a light guide that guides light emitted by the LEDs to the photo diodes along light paths that go under the frame on one side, over the screen, and under the frame on the opposite side, and a processor operative to selectively activate LEDs and photo diodes, to identify location of an object touching the screen, based on amounts of light detected by activated photo diodes when light emitted by activated LEDs is blocked along its light path by the object, and to recognize the object touching the frame, based on amounts of light detected by activated photo diodes when light emitted by activated LEDs is absorbed along its light path by the object, thereby providing light-based touch sensitivity to the screen and to the frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.