Dual TIR prism architecture to enhance DLP projectors
US8322864B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 2008 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Nov 22, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7458
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection system incorporating a prism with dual total internal reflection function, to increase the performance of DLP™ projection, by offering a solution to combine 2 light paths to contribute to the brightness on the screen and at the same time rejecting flat-state and off-state light from entering the projection lens thereby enhancing contrast. In one implementation those two light paths can be collecting light from 2 different light sources which are driven in a pulsed manner with a duty cycle of approximately 50% for each of the two light sources at increased power. In a second implementation with a color sequential single DMD™ projector, while one light path passes a primary color the second light path passes the complementary secondary color. A special color transformation algorithm is proposed to transform the image input signals to make optimal use of the capabilities offered by the second implementation, and create maximum brightness and color saturation of the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.