Colloidal light valve having enhanced image contrast

Details Colloidal light valve having enhanced image contrast Colloidal light valve having enhanced image contrast

1978-12-21

1980-10-14

Corbin, John K.

350362, 350339D, G02F 117

Patent

active

042277752

ABSTRACT:
A colloidal light valve having enhanced image contrast is disclosed. The colloidal light valve has a diffusely transmissive front window and a specially reflective surface on the rear substrate. A thin colloidal suspension of dichroic particles disposed between the window and the rear substrate is operative to change its optical density in the presence of an electrostatic field. In the preferred embodiment, transparent electrodes are disposed on the inner surface of the front window permitting an electrostatic field to be applied across the colloidal suspension in the regions immediately underlying the electrodes. The electrodes are arranged in the familiar multi-element bar pattern capable of forming alpha numerical characters.

REFERENCES:
patent: 3897137 (1975-07-01), Dobbins
patent: 3960438 (1976-06-01), Bonne et al.

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