Holographic high contrast viewing screen embedded in a liquid crystal display
US5631754A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1995 |
| Grant date | May 20, 1997 |
| Priority date | — |
| Expiry date | Oct 20, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H1/0244
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Systems and methods for shaping light from a liquid crystal display are described. A holographic high contrast viewing screen embedded in a liquid crystal display includes a first substrate; a first electrode connected to said first substrate; a light shaping holographic surface relief diffuser connected to said first electrode, said light shaping holographic surface relief diffuser having a first orientation and a first refractive index; a liquid crystal adjacent said light shaping holographic surface relief diffuser, the liquid crystal having a second refractive index that is substantially equal to the first refractive index, in the absence of a driving voltage applied to the first electrode and the second electrode; an alignment layer adjacent said liquid crystal, said alignment layer having a second orientation that is substantially orthogonal to said first orientation; a second electrode connected to said alignment layer; and a second substrate connected to said second electrode. The second refractive index varies as a function of the driving voltage, which is applied between the first electrode and the second electrode. The systems and methods provide advantages in that the f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.