Flat-panel projection display
US7101048B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 2001 |
| Grant date | Sep 5, 2006 |
| Priority date | — |
| Expiry date | Nov 11, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/014
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A flat-panel projection display comprises a slab waveguide having a preferably embossed diffraction grating on one face, a lens for directing light into an edge of the waveguide, and in the focal plane of the lens a liquid-crystal modulator for modulating the intensity of the light as a function of lateral position and elevational direction of travel. The light is ejected from the slab waveguide by the grating at angles corresponding to the input angles, giving a virtual display. The light from the modulator can be expanded in one dimension by passing through a magnifying waveguide, followed by scattering in the plane by a screen and projection by a lens at the other end of the waveguide. Head-up and 3-D displays can be constructed using this principle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.