Polarization transforming optics, polarizing beam splitter and liquid crystal display
US5295018A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1992 |
| Grant date | Mar 15, 1994 |
| Priority date | — |
| Expiry date | Mar 4, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13355
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a polarization transforming optics having a polarizing beam splitter (PBS) for transforming x-direction incident light flux from a metal halide light source into a single linearly (z direction) polarized light flux beam heading in the y direction and delivering the beam to, preferably, a light valve of a liquid crystal display (LCD) in a coordinate space, the PBS splits the incident light flux from the light source into split light flux beams, separates the split light flux beams into linearly polarized light flux beams having polarizing directions which are orthogonal to each other, and delivers two linearly polarized outgoing light flux beams having polarizing directions which are orthogonal to each other and heading in directions parallel to a polarizing direction plane. One of the two outgoing light flux beams is deflected by a single mirror to have the same heading direction and polarizing direction as those of the other. The PBS is constructed by jointing together, for example, a quadrangular pyramidal prism and two triangular pyramidal prisms. A PBS film is formed at each joint interface and a surface in contact with air of each prism acts as a total reflection mirror sur…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.