Liquid crystal display device

1. A liquid crystal display device, comprising:

a first panel having an upper substrate and a lower substrate that face each other with a layer of liquid crystal molecules therebetween; and

a second panel at a lower surface of the liquid crystal panel,

wherein the second panel includes a plurality of black particles and first and second electrodes driving the black particles, and

wherein the black particles blocks light when the first panel displays a black gray and allow to transmit the light when the first panel displays a white or other gray except the black gray.

2. The liquid crystal display device according to claim 1 , further comprising:

a first plurality of sub-pixels in the first panel; and

a second plurality of sub-pixels in the second panel, wherein the first plurality of sub-pixels correspond to the second plurality of sub-pixels.

3. The liquid crystal display device according to claim 2 , further comprising: a separation film between the second plurality of sub-pixels.

4. The liquid crystal display device according to claim 2 , wherein the second panel includes:

an upper plate formed of a transparent material;

the first electrode on the upper plate;

a lower plate formed of a transparent material;

the second electrode on the lower plate; and

the black particles between the upper and lower plates having a faster response speed to an electric field than the liquid crystal molecules.

5. The liquid crystal display device according to claim 4 , wherein the first electrode is transparent.

6. The liquid crystal display device according to claim 4 , wherein the black particles have a positive polarity.

7. The liquid crystal display device according to claim 1 , further comprising:

a black matrix on the upper substrate of the first panel;

a cell area in the first panel defined by the black matrix, wherein the cell area corresponds to an opening in the second electrode.

8. The liquid crystal display device, comprising:

a liquid crystal panel having an upper substrate and a lower substrate that face each other with a layer of liquid crystal molecules therebetween;

a black matrix defining a cell area of each sub-pixel in the liquid crystal panel;

an upper plate formed of a transparent material adhered to the lower substrate;

a first electrode on the upper plate;

a lower plate formed of a transparent material;

a second electrode on the lower plate having an opening corresponding to the cell area;

black particles between the upper and lower plates and moving by the first and second electrodes; and

a cell wall for maintaining the black particles within each sub-pixel.

9. The liquid crystal display device according to claim 8 , wherein the black particles have a faster response speed to an electric field than the liquid crystal molecules.

10. The liquid crystal display device according to claim 8 , wherein the black particles have a positive polarity.