Projection-type image display system
US6179423A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1998 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/006
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illuminating light incidence mirror for introducing an illuminating light to reflection-type liquid crystal panels is provided in one of two pupil division regions constituting a pupil region of a projection lens, and reflected lights directly reflected by the reflection-type liquid crystal panels are transmitted through the other pupil division region of the projection lens and projected. In dark display, the reflected lights from the reflection-type liquid crystal panels and surface-reflected lights reflected by surfaces of the reflection-type liquid crystal panels are blocked by polarizing plates. Further, since .lambda./4 plates and the polarizing plates are provided at inclinations with respect to the reflection-type liquid crystal panels, respectively, projection of surface-reflected lights from the .lambda./4 plates and the polarizing plates onto a screen can be avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.