Method and device for providing a scrolling illumination
US7033027B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 8, 2002 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Sep 6, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/286
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display system comprises a light source (20) producing a beam of unpolarised light and a dynamic filter (28) for filtering said beam of light, wherein a first region of the filter (28) transmits along a first path a first portion of the beam of light having a first polarisation direction and reflects along a second path a second portion of the beam of light which has a second polarisation direction. The display system also provides a spatial light modulator (36) on the first path for receiving light travelling along the first path and selectively modulating that light to form an image light beam. A halve-wavelength retardation (60) of the second portion of the beam of light also is provided. The dynamic filter (28) makes polarised illumination move over the spatial light modulator (36). A corresponding method for providing a scrolling illumination is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.