Volume holographic diffusers
US6714328B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 2002 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Sep 4, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H1/2202
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A partially collimated light beam (2) is sent through a substrate matrix of a plurality of nested individual joined geometrically shaped cells (301) wherein each of the cells is further comprised of subcells (502) contains containing a patterned volume holographic diffuser (302) which produces a transmitted diffused light beam (305) from each of the cells and then superimposes each transmitted diffused light beam from each of the cells to produce a combined resultant diffused light beam. The combined resultant diffused light beam has an angular luminance distribution profile curve (83) with sharply vertical profile slopes (81) at halfpeak points (20) and a substantially flat and wide peak (84), this resultant diffused light beam advantageously produces a uniform resultant luminance over a wide range of view angles with a predetermined beam spread and beam deflection angle at said predetermined viewer head box location (100).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.