Electrophoresis display and driving method thereof

1. An electrophoresis display comprising:

a display panel comprising a plurality of pixel cells to display an image;

a data driving unit that supplies a pixel voltage to a plurality of data lines provided in the display panel;

a common voltage generating unit that generates a common voltage swinging to reverse electric potential and supplies the common voltage to a common electrode of the display panel; and

a timing control unit that generates a data control signal and a common voltage control signal and controls a driving timing of the data driving unit and the common voltage generating unit,

wherein a microcapsule comprising white particles negatively charged and black particles positively charged, respectively, is provided in each of the plurality of the pixel cells,

wherein the common voltage generating unit reverses the electric potential of the common voltage per reset period, first stabilization period, second stabilization period and gray scale period unit while the pixel voltage is supplied to the pixel electrode and the common voltage generating unit supplies the reversed potential common voltage to the common electrode,

wherein the common voltage supplied to the common electrode for the gray scale period is supplied only in a positive electric potential state, and

wherein the negative pixel voltage is supplied to the pixel electrode and white gray scale may be written, and if not writing the white gray scale, levels of the common voltage and the pixel voltage are maintained identically.

2. The electrophoresis display of claim 1 , wherein the timing control unit comprises,

a first frame memory storing image data of a current frame;

a second frame memory storing image data of the next frame;

a look-up table that determines digital image data, which will be displayed in each of the pixel cells for a plurality of frame periods, by comparing the image data of the current frame and the image data of the next frame, the look-up table outputting a common voltage control signal based on the output timing of the digital image data;

a frame counter counting the number of the frames; and

a data memory storing the digital image data output from the look-up table.

3. The electrophoresis display of claim 2 , wherein a positive and negative level of the pixel voltage applied to the pixel electrode is changeably preset according to a swing level of the common voltage.

4. A driving method of an electrophoresis display comprising a display panel having a plurality of pixel cells to display an image, the driving method comprising steps of:

supplying a pixel voltage to a plurality of data lines provided in the display panel;

generating a common voltage swing to reverse electric potential and supplying the common voltage to a common electrode of the display panel; and

generating a data control signal and a common voltage control signal and controlling a driving time of the display panel and a supplying timing of the common voltage,

wherein a microcapsule comprising white particles negatively charged and black particles positively charged, respectively, is provided in each of the plurality of the pixel cells,

wherein the step of supplying the common voltage reverses the electric potential of the common voltage per reset period, first stabilization period, second stabilization period and gray scale period unit while the pixel voltage is supplied to the pixel electrode and the common voltage generating unit supplies the reversed potential common voltage to the common electrode,

wherein the common voltage supplied to the common electrode for the gray scale period is supplied only in a positive electric potential state,

wherein the negative pixel voltage is supplied to the pixel electrode and white gray scale may be written, and if not writing the white gray scale, levels of the common voltage and the pixel voltage are maintained identically.

5. The driving method of claim 4 , wherein the step of controlling the driving timing of the display panel and the supplying timing of the common voltage comprises steps of:

storing image data of a current frame;

storing image data of the next frame;

determining digital image data which will be displayed in each of the pixel cells for a plurality of frame periods by comparing the image data of the current frame and the image data of the next frame, the look-up table outputting a common voltage control signal based on the output timing of the digital image data;

counting the number of the frames; and

storing and outputting the digital image data which will be displayed in each of the pixel cells.

6. The driving method of claim 5 , wherein a positive and negative level of the pixel voltage applied to the pixel electrode is changeably preset according to a swing level of the common voltage.