Method and device for providing a scrolling illumination

Details Method and device for providing a scrolling illumination Method and device for providing a scrolling illumination

2006-04-25

2006-04-25

Dang, Hung Xuan (Department: 2873)

Optics: image projectors

Composite projected image

Multicolor picture

Reexamination Certificate

active

07033027

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.

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