Optical device and projection display
US6583938B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2000 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | Dec 9, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3114
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical device which is suitable for use in a projection display comprises a spatial light modulator, such as a liquid crystal device, with a microlens array disposed on its front surface. The microlenses are of convergent type, such as lenticules. The spatial light modulator is of the reflective type and comprises a plurality of rear reflectors, each of which has convergent optical power in at least one direction. The reflectors are arranged such that, for a given direction of illumination, each reflector forms an image of the aperture A of a microlens on the aperture B of another microlens or at a different position on the same microlens. When used in, for example, a projection display, light losses caused by vignetting are reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.