Contrast adjustable projector apparatus
US7533996B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2005 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Apr 9, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3155
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A contrast adjustable projector apparatus including a body, a light source, an illumination unit, a lens assembly and a regulation device is disclosed. The light source is disposed in the body for generating light beams. The illumination unit connects the light source and the lens assembly to guide the light beams to project onto the lens assembly. The illumination unit includes a digital micromirror device (DMD) which is controlled by a controller to rotate at a specific angle according to the transmitted signals, thereby projecting the light beams transmitting from the light source as an on-state light, a flat state light or an off-state light. The regulation device is provided at an outer side of the lens assembly to adjustably shield at least a part of flat state light which is incident to a light inlet, in order to the contrast of the light emitted out of the lens assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.