Electro-wetting display device
View Patent ↗An electro-wetting display device includes a polar fluid layer, a pixel electrode, a non-polar black fluid layer, a driving electrode, and a color fluid layer. The non-polar black fluid is deformed by a voltage difference between a voltage applied to the pixel electrode and a voltage applied to the polar fluid layer. the non-polar color fluid is deformed by a voltage difference between a voltage applied to the driving electrode and a voltage applied to the polar fluid layer. The driving electrode receives a voltage having a voltage level varied according to a display mode.
1. An electro-wetting display device comprising:
an electrode which receives a first voltage;
a pixel electrode on a first substrate and receiving a second voltage;
a non-polar black fluid on the pixel electrode;
a driving electrode on a second substrate opposite to the first substrate, the driving electrode receiving a third voltage;
a non-polar color fluid on the driving electrode;
a polar fluid layer which is between the non-polar black fluid and the non-polar color fluid, in a cross-sectional thickness direction, and contacts the non-polar black fluid and the non-polar color fluid; and
a hydrophobic insulating layer between the polar fluid layer and the electrode which receives the first voltage,
wherein the polar fluid layer contacts the electrode which receives the first voltage.
2. The electro-wetting display device of claim 1 , wherein the electrode which receives the first voltage comprises a first notch electrode on the first substrate and spaced apart from the pixel electrode.
3. The electro-wetting display device of claim 2 , wherein the electrode which receives the first voltage further comprises a second notch electrode on the second substrate and corresponding to the first notch electrode, wherein the second notch electrode is spaced apart from the driving electrode.
4. The electro-wetting display device of claim 3 , further comprising a plurality of pixel areas, wherein each of the pixel electrode, the non-polar black fluid, and the non-polar color fluid is provided in plural numbers, respectively, in the pixel areas.
5. The electro-wetting display device of claim 3 , further comprising a connecting portion, wherein the first notch electrode is provided in plural numbers, the first notch electrodes extend in a first direction, and the connecting portion connects ends of the first notch electrodes to each other.
6. The electro-wetting display device of claim 5 , wherein each of the second notch electrode and the driving electrode is provided in plural numbers, the second notch electrodes and the driving electrodes are extended in the first direction, and the second notch electrodes and the driving electrodes are alternately arranged in a second direction crossing the first direction.
7. The electro-wetting display device of claim 4 , further comprising
a plurality of first barrier walls on the first substrate at an end portion of each pixel area, and
a plurality of second barrier walls on the second substrate overlapping the first barrier walls, respectively.
8. The electro-wetting display device of claim 4 , wherein each of the non-polar color fluid comprises a red color, a green color, or a blue color.
9. The electro-wetting display device of claim 4 , further comprising a plurality of thin film transistors in the pixel areas, respectively, wherein each of the pixel electrodes is connected to a corresponding thin film transistor of the thin film transistors.
10. The electro-wetting display device of claim 3 , further comprising a reflecting layer between the non-polar black fluid and the first substrate, wherein the reflecting layer reflects an external incident light.
11. The electro-wetting display device of claim 10 , wherein the reflecting layer is between the pixel electrode and the first notch electrode, and between the pixel electrode and the non-polar black fluid.
12. The electro-wetting display device of claim 10 , wherein the reflecting layer comprises a first sub-reflecting layer overlapping the pixel electrode, and a second sub-reflecting layer overlapping the first notch electrode, and
the first sub-reflecting layer is spaced apart from the second sub-reflecting layer.
13. The electro-wetting display device of claim 10 , wherein the reflecting layer is between the pixel electrode and the first substrate.
14. The electro-wetting display device of claim 13 , further comprising a white color filter layer between the reflecting layer and the pixel electrode.
15. The electro-wetting display device of claim 14 , wherein the white color filter layer comprises a photoresist.
16. The electro-wetting display device of claim 3 , wherein the electrode which receives the first voltage further comprises a connecting electrode between the first notch electrode and the second notch electrode, wherein the connecting electrode electrically connects the first notch electrode to the second notch electrode.
17. The electro-wetting display device of claim 16 , wherein the connecting electrode contact the polar fluid layer, such that the first voltage is applied to the polar fluid layer.
18. The electro-wetting display device of claim 3 , wherein the hydrophobic insulating layer is on the second notch electrode and the driving electrode,
an opening is defined extended through the hydrophobic insulating layer,
the opening exposes a portion of the second notch electrode, and
the polar fluid layer directly contacts the exposed portion of the second notch electrode.
19. The electro-wetting display device of claim 1 , further comprising:
a color mode displaying a color according to a voltage level of the third voltage; and
a black and white mode displaying a black or white color according the voltage level of the third voltage,
wherein the third voltage has a same voltage level as the first voltage in the color mode.
20. The electro-wetting display device of claim 19 , wherein the third voltage level has an off-voltage level in the black and white mode.