Dynamic optical compensation for color sequential projection display
US5984478A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1998 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Jul 29, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2207/117
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display for displaying a color image formed of a plurality of color light components is provided, wherein each color light component has a focal length and a magnification. The display has a light source for providing polarized light of a first polarization and a color filter wheel having segments of different color filters for sequentially separating the polarized light into a plurality of different color lights. Also provided is a directing means for directing the different color lights having the first polarization to a light valve and for directing respective color light components of a second polarization transmitted from the light valve towards a screen. A dynamic focus element is provided in the display for adjusting the focal length and/or magnification of each color light component to minimize chromatic variations between the color light components. Lastly, a lens is provided for magnifying and projecting the adjusted color light components onto the screen to produce the color image. In variations of the present invention, the dynamic focus element are various mechanical and electro-optical devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.