Automated calibration in a projection display apparatus
US6671003B1 · kind B1 · utility
8Cited by
15References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1999 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Jun 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/641
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of operating a photo sensor in a projection display device comprises the steps of, illuminating the sensor with a projected image. Detecting a signal from the sensor responsive to the illumination by the projected image. Changing a threshold value of the detector until the signal detection ceases. Storing a value representative of the threshold value which terminated detection of the signal from the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.