Lightvalve projection system in which red, green, and blue image subpixels are projected from two lightvalves and recombined using total reflection prisms
US6512502B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1998 |
| Grant date | Jan 28, 2003 |
| Priority date | — |
| Expiry date | May 27, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2300/0452
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection display for displaying a color image formed of a plurality of color pixels. Each color pixel has a combination of different color light components. The display has a light source for supplying light to an optical path. A projection lens is disposed in the optical path, as are first and second light valves. The first and second light valves each have a plurality of subpixels. Each subpixel has an associated color filter for reflecting a corresponding color light component. The sub-pixels are grouped into groups of three, each group has a single sub-pixel from one of the first or second light valves and the remaining two sub-pixels from the other light valve, which together combine to form a color pixel of the color image for each of the color pixels of the color image. Lastly, directing means are provided for directing the light from the light source to the first and second light valves and for directing the respective color light components reflected from the light valves towards the projection lens which projects and magnifies the color pixels onto a screen thereby forming the color image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.