Reflective liquid crystal projection apparatus with...

Details Reflective liquid crystal projection apparatus with... Reflective liquid crystal projection apparatus with...

2007-10-30

2007-10-30

Ton, Toan (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S005000

Reexamination Certificate

active

11496543

ABSTRACT:
A reflective liquid crystal projection apparatus14is composed of a light source2, a polarizing plate16A for incident light, a reflective liquid crystal element8, another polarizing plate16B for reflected light that is disposed in the cross Nicol relation with the polarizing plate16A and a phase difference compensating plate18disposed between the reflective liquid crystal element8and the other polarizing plate16B. The reflective liquid crystal projection apparatus14projects a picture image formed in the reflective liquid crystal element8on a screen12through a projection lens10. The phase difference compensating plate18has no anisotropy in a plane parallel direction and a larger refractive index in the plane parallel direction than another refractive index in the thickness direction, and is disposed with being slightly tilted with respect to the reflective liquid crystal element8. Accordingly, a picture image high in brightness and high in black and white contrast ratio can be projected on the screen12.

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patent: 2000-199883 (2000-07-01), None
patent: 2001-051270 (2001-02-01), None

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