Electrophoretic display base having porous lid

Patent metadata

Field	Value
Publication number	US-9470948-B2
Application number	US-201313799704-A
Country	US
Kind code	B2
Filing date	Mar 13, 2013
Priority date	Apr 17, 2012
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

An electrophoretic display base includes a base; a partition which is disposed on one surface of the base and in which the opposite side of the one surface is open; an electrophoretic dispersion liquid which contains a dispersion medium and charged particles filled in a cell on the base which is defined by the partition; and a lid which is disposed to block an opening of the partition, and has a porosity capable of passing the electrophoretic dispersion liquid therethrough.

First claim

What is claimed is:

1. An electrophoretic display base, comprising:
a base;
a partition which is disposed on one surface of the base and in which the opposite side of the one surface is open;
an electrophoretic dispersion liquid which contains a dispersion medium and charged particles filled in a cell on the base which is defined by the partition; and
a lid which is disposed between the partition and the base to block an opening of the partition, and has pores with a porosity configured to pass the electrophoretic dispersion liquid through the pores of the lid,
wherein the lid has a porosity diameter greater than a diameter of the charged particles, and
the electrophoretic dispersion liquid is filled in a plurality of cells on the base, the cells being each partitioned by the partition, the porosity of the lid being configured to pass the charged particles from one cell to another cell through the pores of the lid.

2. The electrophoretic display base according to claim 1 , further comprising:
a blocking member which blocks the porosity.

3. The electrophoretic display base according to claim 2 , wherein the blocking member is configured of an adhesive which is disposed on a surface of the lid on a side opposite to a side of the lid which faces the electrophoretic dispersion liquid.

4. The electrophoretic display base according to claim 2 , wherein the blocking member is configured of a release film which is detachably disposed on a surface of the lid on a side opposite to a side of the lid which faces the electrophoretic dispersion liquid.

5. The electrophoretic display base according to claim 1 , wherein the lid is configured of a membrane filter having a plurality of the porosities.

6. The electrophoretic display base according to claim 1 , wherein a relation of R≦2×T/(L×N×g) is satisfied when a surface tension of the electrophoretic dispersion liquid is set to T, the longest diagonal distance of the cell is set to L, a specific gravity of the electrophoretic dispersion liquid is set to N, a gravitational acceleration is set to g, and a radius of the porosity is set to R.

7. An electrophoretic display, comprising:
the electrophoretic display base according to claim 1 ; and
a substrate,
wherein the electrophoretic dispersion liquid is interposed between the base and the substrate.

8. An electrophoretic display, comprising:
rhe electrophoretic display base according to claim 2 ; and
at least one substrate,
wherein an electrophoretic dispersion layer is interposed between a pair of substrates.

9. An electrophoretic display, comprising:
the electrophoretic display base according to claim 3 ; and
at least one substrate,
wherein an electrophoretic dispersion layer is interposed between a pair of substrates.

10. An electrophoretic display, comprising:
the electrophoretic display base according to claim 4 ; and
at least one substrate,
wherein an electrophoretic dispersion layer is interposed between a pair of substrates.

11. An electrophoretic display, comprising:
the electrophoretic display base according to claim 5 ; and
at least one substrate,
wherein an electrophoretic dispersion layer is interposed between a pair of substrates.

12. An electrophoretic display, comprising:
the electrophoretic display base according to claim 6 ; and
at least one substrate,
wherein an electrophoretic dispersion layer is interposed between a pair of substrates.

13. The electrophoretic display based according to claim 1 , wherein the lid is a membrane filter made of polypropylene, polycarbonate, or polysulfone.

14. The electrophoretic display based according to claim 1 , wherein
the electrophoretic dispersion liquid is filled in a plurality of cells on the base, the cells being each partitioned by the partition, and
the lid has a continuous surface extending across plural cells of the plurality of cells.

15. The electrophoretic display based according to claim 14 , wherein the continuous surface of the lid extends across all cells of the plurality of cells.

Assignees

• Seiko Epson Corp

Inventors

• Abe Daisuke
• Nakahara Hiroki
• Nakamura Kazuya

Classifications

• G02F2201/501

  Blocking layers, e.g. against migration of ions · CPC title

• G02F1/167 Primary

  by electrophoresis · CPC title

• G02F2001/1672

  Physics · mapped topic

• Y10T29/4998

  Combined manufacture including applying or shaping of fluent material · CPC title

• G02F1/1681 Primary

  having two or more microcells partitioned by walls, e.g. of microcup type · CPC title