Digital mirror device projector and method of correcting video signal being used in digital mirror device projector
US6733137B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2003 |
| Grant date | May 11, 2004 |
| Priority date | — |
| Expiry date | Mar 19, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/7466
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projector device made up of a digital mirror device (DMD) having several hundreds of thousand of mirror elements is provided which is capable of reducing a difference in chromaticness (tint) caused by performance/characteristic variation between filters or between light sources. The DMD projector is made up of a photosensor being placed in such a position where light reflected from each of the mirror elements in an OFF state is incident, and a correcting unit to receive a video signal and a voltage obtained by a photosensor and to output a corrected video signal to a driving unit, wherein the driving unit controls an inclination of each of mirror elements of a DMD panel according to a corrected video signal and a revolution state of a color wheel and wherein the correcting unit corrects luminance signal for each color of video signals by calculating a relative intensity of light having passed through each filter making up the color wheel using the output of a photosensor occurring when each mirror element of the DMD panel is put in the OFF state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.