Variable density optical filter

Details Variable density optical filter Variable density optical filter

1990-09-28

1991-08-20

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 45, 359 84, 359 91, 359 99, G02F 113

Patent

active

050408798

ABSTRACT:
A light scattering liquid crystal transducer in which the degree of light scattering is controlled by impressing an electric field across the cell during and immediately after the application of a high-energy short duration thermal pulse applied to the entire viewed region of the cell. This allows full gray scale to be achieved as a function of applied voltage.

REFERENCES:
patent: 3796999 (1974-03-01), Kahn
patent: 4031529 (1977-06-01), Borel et al.
patent: 4240712 (1980-12-01), Thirant
patent: 4477151 (1984-10-01), Mash
patent: 4500878 (1985-02-01), Hareng et al.
patent: 4595260 (1986-06-01), Kubota
patent: 4675699 (1987-06-01), Kan et al.
patent: 4701029 (1987-10-01), Crossland et al.
patent: 4702558 (1987-10-01), Coles et al.
patent: 4799770 (1989-01-01), Kahn et al.

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