Electrophoretic display

Patent metadata

Field	Value
Publication number	US-11511997-B2
Application number	US-202016888506-A
Country	US
Kind code	B2
Filing date	May 29, 2020
Priority date	Apr 5, 2017
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

This disclosure provides an electrophoretic display system including a first electrode disposed on a substrate and a three-dimensional (3D) carbon-based structure configured to guide a migration of electrically charged electrophoretic ink particles dispersed therein that are configured to be responsive to application of a voltage to the first electrode. The 3D carbon-based structure includes a plurality of 3D aggregates defined by a morphology of graphene nanoplatelets orthogonally fused together and cross-linked by a polymer; and, a plurality of channels interspersed throughout the 3D carbon-based structure defined by the morphology. The plurality of channels includes a plurality of inter-particle pathways and a plurality of intra-particle pathways. Each inter-particle pathway can include a smaller dimension than each inter-particle pathway. A second electrode is disposed on the 3D carbon-based structure. Each 3D aggregate can include any one or more of graphene, carbon nano-onions, carbon nanoplatelets, or carbon nanotubes.

First claim

What is claimed is:

1. An electrophoretic display system, comprising:
a first electrode disposed on a substrate;
a second electrode disposed on the substrate; and
a three-dimensional (3D) carbon-based structure disposed between the first and second electrodes, the 3D carbon-based structure configured to guide a migration of electrically charged electrophoretic ink particles dispersed throughout the 3D carbon-based structure, the electrically charged electrophoretic ink particles responsive to application of a voltage on the first electrode, the 3D carbon-based structure comprising:
a plurality of 3D aggregates comprising graphene nanoplatelets orthogonally fused together and cross-linked by a polymer; and
a plurality of channels interspersed throughout the 3D carbon-based structure and comprising at least one of an inter-particle pathway or an intra-particle pathway.

2. The electrophoretic display system of claim 1 , wherein the intra-particle pathways are of a smaller dimension than the inter-particle pathways.

3. The electrophoretic display system of claim 1 , further comprising a plurality of recesses formed in any one or more of the plurality of 3D aggregates or the plurality of channels.

4. The electrophoretic display system of claim 1 , wherein the inter-particle pathways have an average radial dimension no greater than approximately 10 μm.

5. The electrophoretic display system of claim 1 , wherein the intra-particle pathways have an average radial dimension greater than approximately 200 nm.

6. The electrophoretic display system of claim 1 , wherein each 3D aggregate further comprises any one or more of graphene, carbon nano-onions, carbon nanoplatelets, or carbon nanotubes.

7. The electrophoretic display system of claim 1 , wherein the polymer includes any one or more of cellulose, cellulose acetate butyrate, styrene butadiene, polyurethane, polyether-urethane, acrylate, epoxy, or vinyl.

8. The electrophoretic display system of claim 1 , wherein the 3D carbon-based structure is independent of any one or more of microcups or microcapsules.

9. The electrophoretic display system of claim 1 , wherein the electrically charged electrophoretic ink particles further comprises a plurality of negatively charged mobile titania particles.

10. The electrophoretic display system of claim 9 , wherein the negatively charged mobile titania particles are configured to display a substantially white coloration.

11. The electrophoretic display system of claim 1 , wherein the 3D carbon-based structure is in a non-electrically conductive state.

12. The electrophoretic display system of claim 1 , further comprising an antenna configured to provide power to the display system.

13. The electrophoretic display system of claim 1 , further comprising a contrast layer disposed between the 3D carbon-based structure and the pair of electrodes.

14. The electrophoretic display system of claim 13 , wherein the contrast layer is a first color, and the plurality of electrically charged electrophoretic ink particles is a second color that is different from the first color.

15. The electrophoretic display system of claim 13 , wherein the contrast layer is white in color.

16. The electrophoretic display system of claim 15 , wherein the contrast layer comprises any one or more of aluminum dioxide, antimony trioxide, barium sulfate, silicon dioxide, titanium dioxide, or zinc sulfide.

17. The electrophoretic display system of claim 15 , wherein the electrophoretic ink is carbon based.

18. The electrophoretic display system of claim 17 , wherein the ink comprises one or more of graphene, carbon nano-onions (CNOs), or carbon nanotubes (CNTs).

19. The electrophoretic display system of claim 1 , wherein the 3D carbon-based structure is defined by a polydispersity index of less than approximately 0.5.

Assignees

• Lyten Inc

Inventors

• Lim Sung H
• Stowell Michael W
• Lanning Bruce

Classifications

• C09D5/44

  for electrophoretic applications (processes for coating by electrophoresis C25D13/00) · CPC title

• G02F1/165

  based on translational movement of particles in a fluid under the influence of an applied field · CPC title

• C01B2204/32

  Size or surface area · CPC title

• C01B32/182

  Graphene · CPC title

• B01J20/28066 Primary

  being more than 1000 m2/g · CPC title