Projected image light pen
US5138304A · kind A · utility
85Cited by
5References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1990 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Aug 2, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0386
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A technique for interaction with a projected video image with a light pen and/or target marks on the projection screen in which light reflected from the projected image is compared with the video image to detect the position of a spot positioned on the projected image by the light pen and/or the reflection of the target marks. The computer used to generate the video image is then caused to position a cursor in the video image in response to the spot position and/or otherwise modify the generated and/or projected video image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.