Compact edge illuminated diffractive display
US9075184B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Apr 17, 2012 |
| Grant date | Jul 7, 2015 |
| Priority date | — |
| Expiry date | Feb 24, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/814
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided a projection display device comprising: a light source, an SBG device comprising a multiplicity of separately SBG elements sandwich between transparent substrate to which transparent electrodes have been applied. The substrates function as a light guide. A least one transparent electrode comprises plurality of independently switchable transparent electrodes elements, each electrode element substantially overlaying a unique SBG element. Each SBG element encodes image information to be projected on an image surface. Light coupled into the light guide, undergoes total internal reflection until diffracted out to the light guide by an activated SBG element. The SBG diffracts light out of the light guide to form an image region on an image surface when subjected to an applied voltage via said transparent electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.