Polymer dispersed liquid crystal color projection display apparatus
US5245449A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1990 |
| Grant date | Sep 14, 1993 |
| Priority date | — |
| Expiry date | Aug 30, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3105
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal color projection display apparatus having a projection light source, a plurality of liquid crystal display elements for separately modulating lights of a plurality of colors from the projection light source and an optical projection system for projecting light to a projection screen, wherein a liquid crystal and polymer composite put between a pair of substrates each equipped with an electrode is used as the liquid crystal display element, in which a liquid crystal material is dispersed and held in a polymer matrix and the refractive index of the polymer matrix substantially agrees with the ordinary light refractive index (n.sub.o) of the liquid crystal material used, a dichroic mirror is used for color splitting or color synthesis and the dependence of dichroic mirror's spectral characteristics upon the state of polarization is decreased. Clear color images of high purity and excellent hue can be obtained. Size and the cost of the liquid crystal display apparatus can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.