Projection video display with multiple photo sensors
US6606130B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1999 |
| Grant date | Aug 12, 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 projection television display apparatus comprises a display device with an image formed for projection and a display screen for receiving the projected image. A plurality of photo sensors are located adjacent to edges of the display screen and each generates an output signal responsive to an intensity of illumination by the projected image. A detector with controllable detection threshold is coupled to the photo sensors for generating a signal having a first state when the output signal generated by each of the plurality photo sensors is greater than the detection threshold, and a second state when the output signal generated by each of said plurality photo sensors is less than the detection threshold. A controller is coupled to the display device and to the detector for setting the detection threshold for the output signal generated by each one of the plurality of photo sensors. In response to the signal having the first state, the controller moves the image on the display device to sequentially illuminate another one of the plurality of photo sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.