Electrowetting display device and method of manufacturing the same
An electrowetting display device including a first base substrate, a second base substrate facing the first base substrate, a first electrode disposed on the first base substrate, a second electrode disposed on the second base substrate to face the first electrode, a partition wall disposed between the first and second electrodes to define a receiving area, a hydrophobic layer disposed on the first electrode, a hydrophilic layer disposed on the second electrode, and first and second fluids accommodated in the receiving area and immiscible with each other. At least one of the first fluid and the second fluid has a polarity. The hydrophilic layer allows droplets separated from a hydrophobic fluid of the first and second fluids to be merged with the hydrophobic fluid. Accordingly, a change in amount of the fluids in each pixel is prevented.
1. An electrowetting display device comprising:
a first substrate;
a second substrate facing the first substrate;
a first electrode disposed on the first substrate;
a second electrode disposed on the second substrate so as to face the first electrode;
a plurality of partition walls disposed between the first and second electrodes, wherein the plurality of partition walls define a receiving area;
a hydrophobic layer disposed on the first electrode;
a hydrophilic layer disposed on the second electrode;
a plurality of first openings through the hydrophilic layer;
a plurality of second openings through the second electrode, wherein the plurality of second openings are substantially aligned with the first openings;
a plurality of third openings through the hydrophilic layer along the plurality of partition walls, wherein the plurality of third openings accommodate upper portions of the plurality of partition walls; and
first and second fluids accommodated in the receiving area and immiscible with each other, at least one of the first fluid and the second fluid having a polarity.
2. The electrowetting display device of claim 1 , wherein the hydrophilic layer and the plurality of partition walls comprise the same material as each other.
3. The electrowetting display device of claim 2 , wherein the hydrophilic layer and the plurality of partition walls comprise an organic insulating material having a hydrophilicity.
4. The electrowetting display device of claim 2 , wherein a contact angle with respect to the hydrophilic layer is about 20° or less.
5. The electrowetting display device of claim 1 , wherein the plurality of partition walls are disposed on the first substrate and physically contacts the hydrophilic layer.
6. The electrowetting display device of claim 5 , wherein the plurality of partition walls have a height equal to or less than about 40 micrometers.
7. The electrowetting display device of claim 6 , wherein the plurality of partition walls comprises an elastic material having a rate of change in height of about 2% or more with respect to the height of the partition wall.
8. The electrowetting display device of claim 1 , further comprising a fixing member interposed between the hydrophilic layer and the plurality of partition walls, the fixing member being configured to fix the plurality of partition walls to the hydrophilic layer.
9. The electrowetting display device of claim 1 , wherein the first fluid comprises a hydrophobic material and has one of red, green, and blue colors, and the second fluid comprises a transparent hydrophilic material having a polarity.
10. A method of manufacturing an electrowetting display device, comprising:
forming a first electrode on a first substrate;
forming a second electrode on a second substrate;
forming a hydrophilic layer on the second electrode;
forming a plurality of partition walls between the hydrophilic layer and the first electrode, wherein the plurality of partition walls define a receiving area;
forming a hydrophobic layer on the first electrode;
providing first and second fluids in the receiving area;
forming a plurality of first openings through the hydrophilic layer;
forming a plurality of second openings through the second electrode, wherein the plurality of second openings are substantially aligned with the first openings; and
forming a plurality of third openings through the hydrophilic layer along the plurality of partition walls, wherein the plurality of third openings accommodate upper portions of the plurality of partition walls,
wherein the first and second fluids are immiscible with each other and at least one of the first fluid and the second fluid has a polarity.
11. The method of claim 10 , wherein the hydrophilic layer and the plurality of partition walls comprise the same material.
12. The method of claim 11 , wherein the hydrophilic layer and the plurality of partition walls comprise an organic insulating material having a hydrophilicity.
13. The method of claim 11 , wherein a contact angle with respect to the hydrophilic layer is about 20° or less.
14. The method of claim 10 , wherein the plurality of partition are formed on the first electrode before the hydrophobic layer is formed on the first electrode, and the hydrophobic layer is formed on the first electrode except for an area in which the plurality of partition walls are formed.
15. The method of claim 10 , wherein the plurality of partition walls are formed on the hydrophilic layer after the hydrophilic layer is formed on the second substrate.
16. The method of claim 10 , wherein the plurality of partition walls and the hydrophilic layer are formed by a same process.
17. The method of claim 10 , wherein a height of the plurality of partition walls is equal to or less than about 40 micrometers and comprises an elastic material with a rate of change in height of about 2% or more with respect to the height of the plurality of partition walls.
18. An electrowetting display device, comprising:
a first substrate;
a second substrate facing the first substrate;
a plurality of partition walls disposed between the first and second substrates, wherein the plurality of partition walls define a receiving area;
a hydrophobic layer disposed on the first substrate;
a hydrophilic layer disposed on the second substrate;
a plurality of first openings through the hydrophilic layer;
a plurality of second openings through the electrode, wherein the plurality of second openings are substantially aligned with the first openings;
a plurality of third openings through the hydrophilic layer along the plurality of partition walls, wherein the plurality of third openings accommodate upper portions of the plurality of partition walls; and
first and second fluids accommodated in the receiving area and immiscible with each other, at least one of the first fluid and the second fluid having a polarity.
19. The electrowetting display device of claim 18 , wherein:
the electrode is a first electrode disposed on the second substrate; and
the electrowetting display device further comprises a second electrode disposed on the first substrate and facing the first electrode; and
wherein the first electrode and the second electrode are configured to generate a potential difference to move the first and second fluids in the receiving area.
20. The electrowetting display device of claim 18 , wherein the hydrophilic layer and the plurality of partition walls comprise the same material as each other.
21. The electrowetting display device of claim 20 , wherein the hydrophilic layer and the plurality of partition walls comprise an organic insulating material having a hydrophilicity.
22. The electrowetting display device of claim 18 , wherein a contact angle with respect to the hydrophilic layer is about 20° or less.
23. The electrowetting display device of claim 18 , wherein the plurality of partition walls have a height equal to or less than about 40 micrometers.