Fluids for an electrowetting device

Patent metadata

Field	Value
Publication number	US-9494791-B1
Application number	US-201414557102-A
Country	US
Kind code	B1
Filing date	Dec 1, 2014
Priority date	Dec 1, 2014
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

An electrowetting device comprises a first support plate and a second support plate, pixel regions between the first support plate and the second support plate, pixel walls on the first support plate that delineate the pixel regions from one another, and an electrolyte solution between the first support plate and the second support plate. The electrolyte solution includes an adsorbent.

First claim

What is claimed is:

1. An electrowetting device comprising:
a bottom support plate and a top support plate positioned above the bottom support plate;
pixel walls that separate pixel regions, and wherein each of the pixel regions includes:
a top electrode disposed on the top support plate;
a hydrophobic layer portion disposed on a pixel electrode;
an electrowetting oil disposed on the hydrophobic layer portion;
an electrolyte solution mixed with an adsorbent comprising particles in a solid state, wherein the electrolyte solution at least partially surrounds the electrowetting oil; and
a pixel electrode disposed on the bottom support plate, wherein the top electrode is electrically coupled to the pixel electrode via the electrolyte solution, wherein applying a voltage between the electrolyte solution and the pixel electrode decreases hydrophobicity of the hydrophobic layer portion to allow the electrolyte solution to move onto the hydrophobic layer portion and substantially displace at least a portion of the electrowetting oil toward an edge of the pixel region.

2. The electrowetting device of claim 1 , wherein the adsorbent comprises nano-zeolites.

3. The electrowetting device of claim 1 , wherein a refractive index of the adsorbent is at least approximately the same as a refractive index of the electrolyte solution.

4. The electrowetting device of claim 1 , wherein the adsorbent comprises particles having average pore sizes in a range from about 3 angstroms up to about 10 angstroms.

5. An electrowetting device comprising:
a first support plate and a second support plate that faces the first support plate;
a first fluid and a second fluid immiscible with the first fluid; and
pixel regions arranged on at least one of the first support plate and the second support plate,
wherein
the second fluid at least partially fills a space between the first support plate and the second support plate, and
the second fluid includes a substantially adsorbent material that comprises at least one of a plurality of pores or a plurality of channels, the at least one of the plurality of pores or the plurality of channels being permeable to at least one of liquids or gases.

6. The electrowetting device of claim 5 , wherein the substantially adsorbent material comprises nano-zeolites.

7. The electrowetting device of claim 6 , wherein the nano-zeolites comprise water.

8. The electrowetting device of claim 6 , wherein a concentration of the nano-zeolites in the second fluid is less than about 10 grams per liter.

9. The electrowetting device of claim 5 , wherein a refractive index of the substantially adsorbent material is at least approximately the same as a refractive index of the second fluid.

10. The electrowetting device of claim 5 , wherein the substantially adsorbent material comprises a core-shell material that includes particles that are a porous silicate core surrounded by a porous inorganic shell.

11. The electrowetting device of claim 5 , wherein the substantially adsorbent material comprises a composite material including a mixture of porous inorganic particles and a porous organic polymer.

12. The electrowetting device of claim 5 , wherein the second fluid comprises an electrolyte solution, and wherein the electrolyte solution and the substantially adsorbent material comprise a colloidal suspension.

13. A method for fabricating at least a portion of an electrowetting device, the method comprising:
placing a fluid on a first support plate, wherein
the fluid includes a substantially adsorbent material having a refractive index that is approximately the same as a refractive index of the fluid, and
the first support plate includes a first electrode layer and a hydrophobic layer on the first electrode layer; and

placing a second support plate over the fluid, wherein the second support plate includes a second electrode layer.

14. The method of claim 13 , wherein placing the fluid on the first support plate comprises:
dispensing the fluid including the substantially adsorbent material from a fluid dispenser onto the hydrophobic layer.

15. The method of claim 13 , wherein the substantially adsorbent material comprises nano-zeolites.

16. The method of claim 15 , wherein the nano-zeolites have average pore sizes in a range from about 3 angstroms up to about 10 angstroms.

17. The method of claim 15 , wherein the nano-zeolites have average particle-sizes in a range from about 40 nanometers up to about 300 nanometers.

18. The method of claim 15 , wherein a concentration of the nano-zeolites in the fluid is less than about 10 grams per liter.

19. An electrowetting device comprising:
a first support plate and a second support plate that faces the first support plate;
a fluid and an electrolyte solution immiscible with the fluid; and
pixel regions arranged on at least one of the first support plate and the second support plate, wherein
the electrolyte solution at least partially fills a space between the first support plate and the second support plate, and
the electrolyte solution includes a substantially adsorbent material, wherein the electrolyte solution and the substantially adsorbent material comprise a colloidal suspension.

20. A method for fabricating at least a portion of an electrowetting device, the method comprising:
placing a fluid on a first support plate, wherein
the fluid includes nano-zeolites, and
the first support plate includes a first electrode layer and a hydrophobic layer on the first electrode layer; and

placing a second support plate over the fluid, wherein the second support plate includes a second electrode layer.

Assignees

• Amazon Tech Inc

Inventors

• Tauk Lara
• Massard Romaric Mathieu

Classifications

• B32B37/18

  involving the assembly of discrete sheets or panels only · CPC title

• B32B37/0038

  involving application of liquid to the layers prior to lamination, e.g. wet laminating (B32B37/12 takes precedence) · CPC title

• G02B26/005 Primary

  based on electrowetting · CPC title

• B32B2457/20

  Displays, e.g. liquid crystal displays, plasma displays · CPC title

• G02B1/06

  made of fluids in transparent cells · CPC title