Electrophoretic display device with improved reflective luminance

1. An electrophoretic display device comprising:

an electrophoretic display panel including sub-pixels corresponding to red, green, blue, and white colors;

wherein each of the sub-pixels comprises charged particles having one of red, blue, green, and white colors.

2. The electrophoretic display device as set forth in claim 1 , wherein the electrophoretic display panel comprises:

a first substrate and a second substrate parallel to each other; and

a partition wall disposed between the first substrate and the second substrate to partition the sub-pixels.

3. The electrophoretic display device as set forth in claim 2 , wherein the partition wall contacts the second substrate.

4. The electrophoretic display device as set forth in claim 2 , further comprising a fluid layer contained in a space defined by the partition wall, wherein the charged particles are dispersed within the fluid layer.

5. The electrophoretic display device as set forth in claim 4 , wherein the fluid layer is a transparent organic solution.

6. The electrophoretic display device as set forth in claim 1 , wherein the charged particles move between the first substrate and the second substrate according to an electric field formed between the first and the second substrates.

7. The electrophoretic display device as set forth in claim 1 , wherein the charge particles comprise:

a colored core; and

a coloring layer around the core.

8. The electrophoretic display device as set forth in claim 7 , wherein the color of the colored core is white.

9. The electrophoretic display device as set forth in claim 7 , wherein the colored core is formed of titanium oxide or silica.

10. The electrophoretic display device as set forth in claim 1 :

wherein the first substrate comprises:

a first insulation substrate;

a thin film transistor formed on the first insulation substrate; and

a pixel electrode connected to the thin film transistor; and

wherein the second substrate comprises:

a second insulation substrate; and

a common electrode formed in the second insulation substrate.

11. The electrophoretic display device as set forth in claim 10 , wherein at least one of the first insulation substrate and the second insulation substrate is formed of a plastic material.

12. The electrophoretic display device as set forth in claim 10 , wherein the second insulation substrate directly contacts the common electrode.

13. The electrophoretic display device as set forth in claim 1 , wherein a group of the sub-pixels having four different colors collectively constitute a pixel, and the sub-pixels of the group are arranged in a 2×2 matrix within the pixel.

14. The electrophoretic display device as set forth in claim 13 , wherein the sub-pixels within the pixel have substantially the same size.

15. The electrophoretic display device as set forth in claim 1 , wherein a group of the sub-pixels having four different colors collectively constitute a pixel, and the sub-pixels of the group are linearly arranged within the pixel.

16. The electrophoretic display device as set forth in claim 15 , wherein the sub-pixels within the pixel have substantially the same size.

17. The electrophoretic display device as set forth in claim 1 , wherein the sub-pixels having four different colors in which each color is one or more constitute a pixel.

18. An electrophoretic display device comprising:

an electrophoretic display panel including sub-pixels having four different colors, wherein the sub-pixels each include charged particles of each corresponding color.