Liquid crystal projection display
US5355187A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1993 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Mar 11, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal projection display capable of functioning at a high light capturing efficiency and a high relative corner illuminance comprises a light source means including a light source, a liquid crystal panel means, a projection lens means and a screen means. A liquid lens formed by sealing a liquid in a space between opposite transparent members is disposed near the light source or the real image of the light source to enhance the relative corner illuminance without reducing the light capturing efficiency by multiplying the angle of divergence of light rays emitted by the light source by the reciprocal of the refractive index of the liquid. A first optical system disposed on the entrance side of the liquid crystal panel is provided with a relative corner illuminance enhancing means comprising a first light converging means disposed relatively near to the light source means, and a second light converging means disposed relatively remote from the light source means. The first light converging means enhances the relative corner illuminance on the entrance surface of the second light converging means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.