Variable transmission light quantity element with dielectric...

Details Variable transmission light quantity element with dielectric... Variable transmission light quantity element with dielectric...

2011-07-19

2011-07-19

Robinson, Mark A (Department: 2883)

Liquid crystal cells, elements and systems

Liquid crystal optical element

Liquid crystal diffraction element

C349S005000

Reexamination Certificate

active

07982848

ABSTRACT:
A variable light transmission device and projection display apparatus which does not generate vibrations and noises but is superior in light blocking property to a variable aperture using polymer-dispersed liquid crystal and can reduce a color change of a projected image as compared with a conventional variable aperture using liquid crystal. A variable light transmission device having: a pair of transparent substrates placed in parallel to each other; a multi-layer grating member disposed on one of opposing surfaces of the pair of transparent substrates, and transparent members having a multi-layer structure periodically placed to form a diffraction grating with a convex and concave section shape; liquid crystal interposed between the transparent substrates to bury the multi-layer grating member; and transparent electrodes for applying electric field to the liquid crystal.

REFERENCES:
patent: 4850681 (1989-07-01), Yamanobe et al.
patent: 5071229 (1991-12-01), Oaki et al.
patent: 6088067 (2000-07-01), Willett et al.
patent: 6778246 (2004-08-01), Sun et al.
patent: 2004/0046908 (2004-03-01), Shih et al.
patent: 2007/0121210 (2007-05-01), Sato
patent: 62-235924 (1987-10-01), None
patent: 4-163801 (1992-06-01), None
patent: 2003-185819 (2003-07-01), None
patent: 2003185819 (2003-07-01), None
patent: 2003-241311 (2003-08-01), None
patent: 2004361856 (2004-12-01), None
patent: WO 01/73504 (2001-10-01), None
Palmer, Christopher, Diffraction Gratings, Feb. 1995, Spectroscopy, vol. 10, No. 2, pp. 14-15.
U.S. Appl. No. 12/422,051, filed Apr. 10, 2009, Nashi.

Affiliated with

Also associated with

Rating

Variable transmission light quantity element with dielectric... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable transmission light quantity element with dielectric..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable transmission light quantity element with dielectric... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2739983