Light modulation medium and light modulation method

Details Light modulation medium and light modulation method Light modulation medium and light modulation method

2005-04-19

2005-04-19

Parker, Kenneth (Department: 2871)

Liquid crystal cells, elements and systems

With specified nonchemical characteristic of liquid crystal...

Utilizing change within liquid crystal phase

C349S175000, C349S035000, C349S077000, C349S078000

Reexamination Certificate

active

06882401

ABSTRACT:
A light modulation medium comprises a light modulation element having a pair of substrates and plural light modulation layers arranged between the substrates to form a multilayer structure and made of cholesteric liquid crystal adapted to change the liquid crystal orientation in response to application of a predetermined electric field, in which the ratio of the threshold electric field at which the liquid crystal orientation is moved from a planar state to a focal conic state of a first light modulation layer of the light modulation element to that of a second light modulation layer is not less than 0.3 and the ratio of the dielectric constant in a planar state of liquid crystal orientation of the first light modulation layer to that of the second light modulation layer is not less than 4.

REFERENCES:
patent: 6034752 (2000-03-01), Khan et al.
patent: 6618102 (2003-09-01), Harada et al.
patent: 2001-154219 (2001-08-01), None

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