Colloidal light valve having enhanced image contrast
AssigneeThe Bendix Corporation
InventorGeorge W. Goodrich
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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.
Claims8
A colloidal display having enhanced brightness comprising:
- a diffusely transmissive window having a front and rear surface, said diffusely transmissive window having a set of electrically conductive transparent electrodes disposed along said rear surface in a predetermined pattern;
- a rear substrate having a specularly reflective front surface and a rear surface;
- a thin peripheral spacer disposed between the rear surface of said window and the front surface of said rear substrate forming an enclosed chamber between said window and rear substrate;
- a colloidal suspension of dichroic dipole particles disposed in said chamber and filling the space between said window and rear substrate;
- and
- means for applying an electrical potential between the individual electrodes of said set of transparent electrodes and the specularly reflective surface of said rear substrate.
Dependencies are inferred from the claim text.