ELECTROWETTING DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF

• US 20130208337A1
• Filed: 01/24/2013
• Published: 08/15/2013
• Est. Priority Date: 02/09/2012
• Status: Active Grant

• Current Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Dae Jin, Lee, Bo Ram, Kodaira, Taimei, Bae, Joo-Han, Baek, Seung-Jin, Yoon, Da Hye, Cho, Hyeon Gu
• Granted Patent: US 8,982,444 B2
• Time in Patent Office: Days
• US Class Current: 359/290
• CPC Class Codes: G02B 26/005 based on electrowetting
• CPC Class Codes: Y10T 29/49155 Manufacturing circuit on or in base

Abstract

The present inventive concept relates to an electrowetting display device including a lyophobic colloid material and a polymer resin such as an organic layer or a polyimide (PI), and a lyophobic layer including a supporting layer supporting the lyophobic colloid material and using a photoreactive fluorine-based surfactant for a fluorine-based material to be positioned above and for a hardened photoreactive material layer to be positioned below through exposure in a single step without separately performing a hydrophilic treatment and then a water-repellent treatment, thereby reducing the number of processes, the manufacturing time, and the cost.

Claims

1. An electrowetting display device comprising:

a substrate;

a pixel electrode formed on the substrate;

an interlayer insulating layer formed on the pixel electrode;

a plurality of partitions formed on the interlayer insulating layer; and

a lyophobic layer formed on the interlayer insulating layer between the partitions, wherein the lyophobic layer is phase-separated.

2. The electrowetting display device of claim 1, wherein

the lyophobicity layer includes a lyophobic colloid material and a supporting layer,

the lyophobic colloid material is positioned above the supporting layer.

3. The electrowetting display device of claim 2, wherein

the lyophobic colloid material includes an Rf group.

4. The electrowetting display device of claim 3, wherein

the Rf group includes Rf C4α

-X.

5. The electrowetting display device of claim 3, wherein

the lyophobic colloid material includes a liquid repellent agent of Daikin.

6. The electrowetting display device of claim 2, wherein

the supporting layer includes an organic layer or a polyimide resin.

7. The electrowetting display device of claim 1, wherein

a black oil layer is disposed on the lyophobic layer between the partitions.

8. The electrowetting display device of claim 1, wherein

a reflecting electrode formed of a material that reflects light is disposed between the pixel electrode and the interlayer insulating layer.

9. A method for manufacturing an electrowetting display device, comprising:

forming a pixel electrode on a substrate;

forming an interlayer insulating layer on the pixel electrode;

forming a partition on the interlayer insulating layer;

coating a lyophobic colloid mixed liquid on the interlayer insulating layer between the partitions; and

pre-baking the lyophobic colloid mixed liquid;

wherein the lyophobic colloid mixed liquid comprises a mixture including a lyophobic colloid material and a supporting layer material, wherein the supporting material comprises a polymer resin of an organic layer or a polyimide (PI).

10. The method of claim 9, wherein

the lyophobic colloid mixed liquid is phase-separated by the pre-baking the lyophobic colloid mixed liquid and forms a lyophobic layer, and

the lyophobic layer includes a lyophobic colloid material and a supporting layer.

11. The method of claim 10, wherein

the lyophobic colloid material is positioned above the supporting layer on the interlayer insulating layer between the partitions.

12. The method of claim 11, wherein

the lyophobic colloid material includes an Rf group.

13. The method of claim 12, wherein

the Rf group includes Rf C4α

-X.

14. The method of claim 12, wherein

the lyophobic colloid material includes a liquid repellent agent of Daikin.

15. The method of claim 10, wherein

the supporting layer includes an organic layer of a polyimide resin.

16. The method of claim 9, wherein

the lyophobic colloid mixed liquid is coated through a spin coating method, a spray coating method, an inkjet injecting method, or a polyimide (PI) print method.

17. The method of claim 9, further comprising,

after the pre-baking, forming a black oil layer on the lyophobicity layer between the partitions.

18. The method of claim 9, further comprising,

forming a reflecting electrode formed of a material that reflects light between the pixel electrode and the interlayer insulating layer.

19. The method of claim 9, wherein

the lyophobic colloid mixed liquid includes a photoreactive fluorine-based material.

20. An electrowetting display device comprising:

a substrate;

a pixel electrode formed on the substrate;

a plurality of partitions formed on the pixel electrode;

a phase-separated photoreactive fluorine-based surfactant layer formed on an interlayer insulating layer between the partitions; and

a water-repellent layer formed on the photoreactive fluorine-based surfactant layer.

21. The electrowetting display device of claim 20, wherein

the photoreactive fluorine-based surfactant includes a photoreactive material layer that is hardened by light and a fluorine-based material, and

the fluorine-based material is positioned above the hardened photoreactive material layer.

22. The electrowetting display device of claim 21, wherein

the photoreactive fluorine-based surfactant is “

Megaface RS-72-K”

manufactured by DIC company.

23. The electrowetting display device of claim 20, wherein

the photoreactive fluorine-based surfactant includes a compound having a perfluoro alkyl group and a photoreactive material.

24. The electrowetting display device of claim 20, wherein

a black oil layer is formed on the lyophobic layer between the partitions.

25. The electrowetting display device of claim 20, wherein

the interlayer insulating layer is disposed on the pixel electrode and under the photoreactive fluorine-based surfactant layer and under the partition.

26. A method for manufacturing an electrowetting display device, comprising:

forming a pixel electrode on a substrate;

coating a photoreactive fluorine-based surfactant on the pixel electrode;

exposing the coated photoreactive fluorine-based surfactant to be hardened to remove the photoreactive fluorine-based surfactant that is not exposed and to form a photoreactive fluorine-based surfactant layer;

forming a plurality of partitions at a region where the photoreactive fluorine-based surfactant is removed; and

forming a water-repellent layer on the hardened photoreactive fluorine-based surfactant layer.

27. The method of claim 26, wherein

the photoreactive fluorine-based surfactant includes a photoreactive material layer that is hardened by light and a fluorine-based material.

28. The method of claim 27, wherein

upon the exposure of the coated photoreactive fluorine-based surfactant, the coated photoreactive fluorine-based surfactant is phase-separated such that the fluorine-based material is positioned above the hardened photoreactive material layer.

29. The method of claim 28, wherein

the photoreactive fluorine-based surfactant is “

Megaface RS-72-K”

manufactured by DIC company.

30. The method of claim 26, wherein

the photoreactive fluorine-based surfactant includes a compound having a perfluoro alkyl group and a photoreactive material.

31. The method of claim 26, wherein

a developer is provided to remove the photoreactive fluorine-based surfactant that is not exposed.

32. The method of claim 26, further comprising,

after forming the water-repellent layer, forming a black oil layer on the lyophobic layer between the partitions.

33. The method of claim 26, further comprising

forming an interlayer insulating layer on the pixel electrode between the steps of forming of the pixel electrode and the coating of the photoreactive fluorine-based surfactant.