Projecting device for displaying electronic images
US6247814A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1999 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Oct 20, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3167
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light source generates a trichromatic beam of polarized light with red, green and blue components. An input lens set comprising a dichromatic mirror and a retarder film separates the trichromatic beam into a polarized monochromatic beam and a perpendicular bichromatic beam. The bichromatic beam comprises two monochromatic beams with opposite polarizations. The monochromatic beam and bichromatic beam from the input lens set are transmitted into an optic module. The monochromatic beam bounces off of a polarization beam splitter mirror into a first of three modulation units. The modulation units generate a modulated reflected beam with an opposite polarization of the input beam. The modulated reflected monochromatic beam passes through the polarization beam splitter mirror to a dichroicmirror and is reflected into a projecting lens. The bichromatic beam is split by another polarization beam splitter mirror. One beam is transmitted to the second modulation unit, the other is reflected to the third modulation unit. The second modulated beam refects off the polarization beam splitter to pass through the dichroic mirror into the projecting lens. The third modulated beam transmits throug…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.