Projection video display with photo transistor sensors
US6750921B1 · kind B1 · utility
5Cited by
2References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 29, 2000 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Mar 29, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7408
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for determining raster positioning in a video projection display apparatus comprises the steps of detecting illumination by a first edge of a measurement image moving in a first direction. Detecting illumination by a second edge of the measurement image moving in a second direction, and averaging movement values related to the first and second edge illuminations of the detecting steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.