Light pen system for pixel-based displays
US7421111B2 · kind B2 · utility
23Cited by
9References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2003 |
| Grant date | Sep 2, 2008 |
| Priority date | — |
| Expiry date | Jan 9, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03542
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An interactive display system includes a pixel-based display surface and a light pen. A sequence of patterns is projected onto the display surface. The sequence of patterns has a unique sequence of light intensities for each location of the display surface. Intensities of light at an arbitrary location are sensed by the light pen while projecting the sequence of patterns. The intensifies of light are decoded to determine coordinates of the arbitrary location.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.