Projection display apparatus

Details Projection display apparatus Projection display apparatus

2009-06-01

2011-11-01

Sohn, Seung C (Department: 2878)

Optics: image projectors

Composite projected image

Multicolor picture

C359S707000

Reexamination Certificate

active

08047655

ABSTRACT:
A projection display apparatus is provided that is capable of reducing speckle noise, with no image of a flaw or dust noticeable in or on a screen even if it exists in or on an optical component. The projection display apparatus includes a glass rod that makes uniform an optical beam emitted from a laser beam source; a lens that focuses an optical beam passing through the glass rod; a diffusion layer that provides an optical path difference distribution to the optical beam focused using the focusing element, the diffusion layer being optically conjugated with an incident end of the glass rod by the focusing element; a display device that spatially modulates the optical beam provided with the optical path difference distribution by the diffusion layer; and a magnification projection lens that projects on a screen an optical beam modulated by the modulator.

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