Light modulating device including a liquid crystal, a polymer an

Details Light modulating device including a liquid crystal, a polymer an Light modulating device including a liquid crystal, a polymer an

1992-07-24

1994-01-18

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 96, 359 70, G02F 1133

Patent

active

052803732

ABSTRACT:
A light modulating device comprising a pair of electrode substrates having supported therebetween an electrically light modulating material containing a liquid crystal and a polymer, in which said light modulating material further contains (1) a combination of a dichroic dye having a maximum absorption in the wavelength region of from 400 to 489 nm, a dichroic dye having a maximum absorption in the wavelength region of from 490 to 559 nm, and a dichroic dye having a maximum absorption in the wavelength region of from 560 to 699 nm and/or (2) a near infrared- to infrared-absorbing dichroic dye having a maximum absorption in the wavelength region of 700 nm or more. The light modulating device exhibits high performance in controlling transmission of visible to infrared light and a high contrast between "on" and "off" states.

REFERENCES:
patent: 4749261 (1988-06-01), McLaughlin et al.
patent: 4818070 (1989-04-01), Gunjima et al.

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