Liquid crystal cells – elements and systems – Liquid crystal optical element – Liquid crystal diffraction element
Reexamination Certificate
2001-08-31
2008-09-09
Weiss, Howard (Department: 2814)
Liquid crystal cells, elements and systems
Liquid crystal optical element
Liquid crystal diffraction element
C349S202000, C349S113000, C349S082000, C257S079000, C257S080000, C257S081000
Reexamination Certificate
active
07423719
ABSTRACT:
An optical diffusion film comprises a plurality of diffraction grating cells formed on a substrate, each cell comprising a plurality of curved gratings disposed in parallel with each other and containing the same profile. Such film can be manufactured by embossing, using an original plate formed by etching a photosensitive material by means of an electronic beam exposure system to produce gratings. When such a film is provided with a reflection layer and exposed to light coming obliquely from above, highly bright and diffracted light is emitted in a predetermined direction.
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Rao Steven H
Toppan Printing Co. Ltd.
Weiss Howard
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