Optical touch screen system and sensing method for the same
US9052780B2 · kind B2 · utility
2Cited by
7References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2011 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | Jan 27, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0416
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical touch screen system includes a touch screen, an image-sensing device, and a processing device. The image-sensing device generates a plurality of light-shielding information of an object at a plurality of time points. The processing device coupled to the image-sensing device includes a computing unit calculating a projected size difference value according to the plurality of light-shielding information, wherein the projected size difference value is a difference value between the projected sizes of the object on the touch screen at two different time points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.