Rear projection screen using internal reflection
US6417966B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1999 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Jul 7, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/62
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optically dispersing film for a rear projection system includes reflecting surfaces disposed so as to reflect light passing therethrough into at least one dispersion plane. The reflecting surfaces are formed by structures, of a first refractive index, disposed within a layer of material having a second refractive index. The structures have light absorbing bases at the viewing side of the film. In some embodiments, the reflecting surfaces are disposed at one or more angles so as to reflect light into a number of different directions. In other embodiments, the layer of material having the second refractive index includes diffusing particles that diffuse the light. The film permits the asymmetric dispersion of image light in a rear projection system, so that the light may be selectively directed towards the viewer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.