Transmission type screen, image display method for transmission type screen, and projection display apparatus
US8553325B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2010 |
| Grant date | Oct 8, 2013 |
| Priority date | — |
| Expiry date | Feb 4, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/625
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The transmission type screen includes: a Fresnel lens screen (20); and an image display element (30), in which the Fresnel lens screen includes: a Fresnel optical element (21) including a prism formed on an incident surface side as seen from the emitter; and a first light diffusion unit (22) for diffusing an image light passing through the Fresnel optical element, and the image display element includes: a lens element (40) for spatially dividing the image light from the Fresnel lens screen and changing a direction of the image light; a birefringent layer (90) provided at a subsequent stage of the lens element, for mixing image light obtained by spatial division; and a second light diffusion unit (60) provided at a subsequent stage of the birefringent layer, for diffusing the image light passing through the birefringent layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.