Electronic display device providing static grayscale image
AssigneeHewlett-Packard Development Company, L.P.
InventorsCary G. Addington, Jong-Souk Yeo
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Abstract
In one embodiment, a device includes a first display element including: a first electrode; a transparent dielectric layer having recessed regions therein over the first electrode; a halftoned second electrode opposite the first electrode; and a fluid with colorant particles between the first electrode and the second electrode, wherein a voltage signal applied between the first electrode and the second electrode controls movement of the colorant particles such that a first voltage signal provides a clear optical state by compacting the colorant particles into the recessed regions and a second voltage signal provides a grayscale optical state by attracting the colorant particles to the second electrode.
Claims20
A device comprising:
- a first display element comprising:
- a first electrode;
- a transparent dielectric layer having recessed regions therein over
- the first electrode;
- a halftoned second electrode opposite the first electrode;
- and
- a fluid with colorant particles between the first electrode and the
- second electrode,
- wherein a voltage signal applied between the first electrode and the second electrode controls movement of the colorant particles such that a first voltage signal provides a clear optical state by compacting the colorant particles into the recessed regions and a second voltage signal provides a grayscale optical state by attracting the colorant particles to the second electrode.
A device comprising:
- a first electrode;
- a patterned dielectric layer over the first electrode;
- a second electrode opposite the first electrode;
- and
- a fluid with colorant particles between the first electrode and the second electrode,
- wherein a voltage signal applied between the first electrode and the second electrode controls movement of the colorant particles such that a first voltage signal provides a grayscale optical state by attracting at least a portion of the colorant particles to exposed portions of the first electrode and a second voltage signal provides a dark optical state by dispersing the colorant particles between the first electrode and the second electrode.
A method for producing a static grayscale image for an electro-optical display device, the method comprising:
- applying a conductor to a first substrate;
- removing portions of the conductor to provide a patterned first electrode;
- joining the first substrate and first electrode to a second substrate supporting a second electrode and a dielectric layer over the second electrode, the dielectric layer comprising recessed regions;
- filling a space between the first electrode and the second electrode with a fluid with colorant particles;
- and
- applying a first voltage signal between the first electrode and the second electrode to produce a static grayscale image by attracting the colorant particles onto the patterned first electrode.
Dependencies are inferred from the claim text.