Electrophoresis device, display unit, and electronic apparatus

Patent metadata

Field	Value
Publication number	US-9733541-B2
Application number	US-201314424252-A
Country	US
Kind code	B2
Filing date	Jul 17, 2013
Priority date	Sep 5, 2012
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

An electrophoresis device including: in an insulating liquid, migrating particles in a charged state; and a porous layer including a fibrous structure and non-migrating particles, the fibrous structure having a potential opposite to that of the migrating particles, and the non-migrating particles held by the fibrous structure.

First claim

The invention claimed is:

1. An electrophoresis device, comprising:
in an insulating liquid:
migrating particles in a charged state; and
a porous layer that includes a fibrous structure and non-migrating particles,
wherein the fibrous structure has a potential opposite to that of the migrating particles,
wherein the non-migrating particles held by the fibrous structure have a potential same as the potential of the fibrous structure, and
wherein the insulating liquid comprises a dispersant that has both a positive polarity and a negative polarity.

2. The electrophoresis device according to claim 1 , wherein the fibrous structure is negatively charged, and the migrating particles are positively charged.

3. The electrophoresis device according to claim 2 , wherein
the fibrous structure comprises polyacrylonitrile, and
an absolute value of a surface potential in the fibrous structure is larger than 25 mV.

4. The electrophoresis device according to claim 2 , wherein the fibrous structure has a negatively charged functional group.

5. The electrophoresis device according to claim 1 , wherein the fibrous structure has a sulfonic acid group.

6. The electrophoresis device according to claim 1 , wherein a fiber diameter of the fibrous structure is from 50 nm to 2000 nm both inclusive.

7. The electrophoresis device according to claim 1 , wherein an average pore diameter of the fibrous structure is from 0.1 μm to 10 μm both inclusive.

8. The electrophoresis device according to claim 1 , wherein the fibrous structure is obtained by an electrostatic spinning method.

9. The electrophoresis device according to claim 1 , wherein the non-migrating particles and the migrating particles have reflection properties different from each other.

10. The electrophoresis device according to claim 9 , wherein
reflectivity of the non-migrating particles is higher than reflectivity of the migrating particles, and
the migrating particles are configured to display in a dark state, and the porous layer is configured to display in a bright state.

11. The electrophoresis device according to claim 1 , wherein the non-migrating particles comprises at least one of an organic pigment, an inorganic pigment, a dye, a carbon material, a metal material, a metal oxide, glass, or a polymer material.

12. The electrophoresis device according to claim 1 , wherein the fibrous structure has a phosphoric acid group.

13. The electrophoresis device according to claim 1 , wherein the migrating particles are one of white colored or black colored.

14. A display unit, comprising:
an electrophoresis device, comprising:
in an insulating liquid:
migrating particles in a charged state; and
a porous layer that includes a fibrous structure and non-migrating particles,
wherein the fibrous structure comprises a functional group that has a potential opposite to that of the migrating particles,
wherein the non-migrating particles held by the fibrous structure have a potential same as the potential of the fibrous structure, and
wherein the insulating liquid comprises a dispersant that has both a positive polarity and a negative polarity.

15. An electronic apparatus, comprising:
an electrophoresis device, comprising:
in an insulating liquid:
migrating particles in a charged state; and
a porous layer that includes a fibrous structure and non-migrating particles,
wherein the fibrous structure comprises a functional group that has a potential opposite to that of the migrating particles,
wherein the non-migrating particles held by the fibrous structure have a potential same as the potential of the fibrous structure, and
wherein the insulating liquid comprises a dispersant that has both a positive polarity and a negative polarity.

Assignees

• Sony Corp

Inventors

• Shuto Aya
• Takanashi Hidehiko
• Kobayashi Ken
• Kaino Yuriko
• Mitsugi Masakazu

Classifications

• G02F2001/1678

  characterised by the composition or particle type · CPC title

• G02F1/167 Primary

  by electrophoresis · CPC title

• G02F1/133348

  Charged particles addressed liquid crystal cells, e.g. controlled by an electron beam · CPC title