Lamp power pulse modulation in color sequential projection displays
US6520648B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2001 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Feb 6, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3114
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A frame sequential color display projection system (110) of this invention includes an arc lamp (112) having a predetermined power rating for providing a source of polychromatic light that propagates through a color wheel (120) that sequentially provides R, G, B, and optionally, W light colors during respective sequential time periods. A display controller (131) is synchronized with the color wheel to generate color image data during the respective time periods. A light valve, such as a DMD (130), receives the color image data for generating the frame sequential color display. A lamp ballast (156) is also synchronized with the color wheel to provide nominal and boosted power levels (212) to the arc lamp during selected ones of the time periods such that the projector provides a brighter, color-adjusted display without requiring the arc lamp to operate at an average power level exceeding its predetermined power rating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.