Electrowetting display device and manufacturing method thereof
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.
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 such that the lyophobic layer comprises (i) lyophobic colloid material and (ii) a polymer resin.
2. The electrowetting display device of claim 1 , wherein
the polymer resin comprises one of (i) an organic layer or (ii) a polyimide,
the lyophobic colloid material is positioned above the polymer resin.
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 1 , wherein
a black oil layer is disposed on the lyophobic layer between the partitions.
7. 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.
8. 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).
9. The method of claim 8 , 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.
10. The method of claim 9 , wherein
the lyophobic colloid material is positioned above the supporting layer on the interlayer insulating layer between the partitions.
11. The method of claim 10 , wherein
the lyophobic colloid material includes an Rf group.
12. The method of claim 11 , wherein
the Rf group includes Rf C4α-X.
13. The method of claim 11 , wherein
the lyophobic colloid material includes a liquid repellent agent of Daikin.
14. The method of claim 9 , wherein
the supporting layer includes an organic layer of a polyimide resin.
15. The method of claim 8 , 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.
16. The method of claim 8 , further comprising,
after the pre-baking, forming a black oil layer on the lyophobicity layer between the partitions.
17. The method of claim 8 , further comprising,
forming a reflecting electrode formed of a material that reflects light between the pixel electrode and the interlayer insulating layer.
18. The method of claim 8 , wherein
the lyophobic colloid mixed liquid includes a photoreactive fluorine-based material.
19. 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,
wherein the phase-separated photoreactive fluorine-based surfactant layer is phase-separated such that the photoreactive fluorine-based surfactant comprises (i) a fluorine-based material and (ii) a photoreactive material, and
wherein the fluorine-based material is above the photoreactive material.
20. The electrowetting display device of claim 19 , wherein
the photoreactive fluorine-based surfactant comprises “Megaface RS-72-K” manufactured by DIC company.
21. The electrowetting display device of claim 19 , wherein
the photoreactive fluorine-based surfactant includes a compound having a perfluoro alkyl group and a photoreactive material.
22. The electrowetting display device of claim 19 , wherein
a black oil layer is formed on the water-repellent layer between the partitions.
23. The electrowetting display device of claim 19 , wherein
the interlayer insulating layer is disposed on the pixel electrode and (i) under the photoreactive fluorine-based surfactant layer and (ii) under the partition.
24. 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, wherein the photoreactive fluorine-based surfactant includes (i) a photoreactive material and (ii) a fluorine-based material;
depositing a mask on first portions of the coated photoreactive fluorine-based surfactant;
exposing second portions of the coated photoreactive fluorine-based surfactant, wherein upon exposure of the second portions of the coated photoreactive fluorine-based surfactant, the second portions of the coated photoreactive fluorine-based surfactant are hardened and phase-separated to form a phase-separated photoreactive fluorine-based surfactant layer, and wherein the phase-separated photoreactive fluorine-based surfactant layer comprises a fluorine-based material positioned above a photoreactive material;
removing the first portions of the photoreactive fluorine-based surfactant layer;
forming a plurality of partitions at the first portions of the coated photoreactive fluorine-based surfactant layer where the first portions of the coated photoreactive fluorine-based surfactant layer are removed; and
forming a water-repellent layer on the photoreactive fluorine-based surfactant layer between the partitions.
25. The method of claim 24 , wherein
the photoreactive fluorine-based surfactant is “Megaface RS-72-K” manufactured by DIC company.
26. The method of claim 24 , wherein
the photoreactive fluorine-based surfactant includes a compound having a perfluoro alkyl group and a photoreactive material.
27. The method of claim 24 , wherein
a developer is provided to remove the first portions of the coated photoreactive fluorine-based surfactant.
28. The method of claim 24 , further comprising,
after forming the water-repellent layer, forming a black oil layer on the water-repellent layer between the partitions.
29. The method of claim 24 , further comprising
forming an interlayer insulating layer on the pixel electrode after the forming of the pixel electrode and before the coating of the photoreactive fluorine-based surfactant.