LCD position determination apparatus for LCD projector
US5975705A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1997 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Nov 13, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B43/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An LCD position determination apparatus for an LCD projector which is capable of shortening an assembling time of a projector by facilitating or enabling alignment of the red (R), green (G) and blue (B) cells by detecting the positions of the R, G and B LCDs at the same time when installing the R, G and B LCDs at or along three surfaces of a prism. The apparatus includes the red LCD, green LCD and blue LCD optically aligned with three respective surfaces of the color mixing prism, a pair of two-way splitting mirrors aligned with a fourth surface of the prism, and an automatic collimator apparatus having an ocular lens by which an image of a predetermined corner portion of each of the LCDs transmitted via the two-way mirrors is viewed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.