RGB illuminator with calibration via single detector servo
US6633301B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1999 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | May 17, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/145
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display system includes a light modulator divided into an array of individually controllable pixels and an input-driven illumination device. The illumination device is adapted to receive a variable input and is configured to direct light of variable intensity onto the modulator, depending on the input. The display system further includes a calibrating arrangement for establishing the input to the illumination device to produce a desired intensity level of light. The calibrating arrangement includes a light sensing mechanism, which senses the light from the illumination device while the illumination device is driven by an initial input. The calibration arrangement is configured to determine a comparison between the sensed light and a value representative of the desired-intensity level. The calibration arrangement further includes a control arrangement responsive to the comparison for varying the input so as to provide light of the desired intensity level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.