Projection surface with reflective elements for non-visible light
US9041691B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2013 |
| Grant date | May 26, 2015 |
| Priority date | — |
| Expiry date | Aug 8, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0425
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A passive projection screen presents images projected thereon by a projection system. A surface of the screen includes elements that are reflective to non-visible light, such as infrared (IR) light. When non-visible light is directed to the screen, the non-visible light is reflected by the reflective elements back. Part of the reflected light may contact and reflect from a user's fingertip or hand (or other object, such as a stylus) while another part is reflected to the projection system. The projection system differentiates among distances to the surface and distances that include the additional travel to the fingertip. As the fingertip moves closer to the surface, the distances approach equality. When the distances are approximately equal, the finger is detected as touching the surface. In this manner, a projection surface equipped with reflective elements facilitates more accurate touch detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.