Projection display device
US8057044B2 · kind B2 · utility
3Cited by
3References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 2, 2008 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Nov 5, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/2073
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a projection display device, a polarization converting element is provided between an imager and a refracting optical system for converting a polarization direction of light after modulation into a direction radially extending from the center of the optical axis of the refracting optical system. Light transmitted through the polarization converting element is incident onto the refracting optical system in a state of P-polarized light or a state close to the state of P-polarized light. Thereby, the transmittance of light through the refracting optical system is made substantially uniform and increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.