Projection type display
US6379010B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1999 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Mar 29, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B33/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a projection type display using a transmission type liquid crystal light valve, and its object is to supply a projection type display capable of exhibiting a high quality gradation display by preventing a leak current at a switching device. The projection type display comprises three liquid crystal light valves 21R, 21G, and 21B which have polarizing plates 20Rp, 20Gp, and 20Bp, modulate in intensity and emit each light of color components of red, green, and blue, and a dichroic prism to synthesize exiting lights from respective light valves. The projection type display is structured to arrange half-wave plates 20Ri, and 20Gi between the liquid crystal light valves 21R, and 21G for red and green, to set a polarizing direction of an exiting light of a blue component orthogonal to polarizing directions of the other two exiting lights.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.