Electro phoretic display and driving method thereof
An exemplary embodiment provides an electro phoretic display that includes a lower substrate, a first pixel electrode on the lower substrate, an electronic ink layer on the first pixel electrode. The electro phoretic display further includes a common electrode on the electronic ink layer, a liquid crystal layer implementing a color on the common electrode, a second pixel electrode on the liquid crystal layer, and an upper substrate on the second pixel electrode.
1. A driving method of an electrophoretic display that includes a first pixel electrode on a lower substrate, an electronic ink layer on the first pixel electrode, a common electrode on the electronic ink layer, a liquid crystal layer on the common electrode, a second pixel electrode on the liquid crystal layer, an upper substrate on the second pixel electrode, and a plurality of pixels on the lower substrate, the driving method comprising:
adjusting positions of white charged particles and black charged particles in the electronic ink layer by applying a gray voltage between the first pixel electrode and the common electrode; and
adjusting the liquid crystal layer with a color voltage configured to be applied between the common electrode and the second pixel electrode,
wherein the liquid crystal layer is a cholesteric liquid crystal layer, and
wherein the adjusting the liquid crystal layer includes:
implementing white by adjusting the liquid crystal layer corresponding to all of the plurality of pixels to be in a planar state by not applying the color voltage, and by having the white charged particles of the electronic ink layer corresponding to all of the plurality of pixels positioned closer to the liquid crystal layer than the black charged particles;
implementing black by adjusting the liquid crystal layer corresponding to all of the plurality of pixels to be in a focal conic state by applying the color voltage, and by having the black charged particles of the electronic ink layer corresponding to all of the plurality of pixels positioned closer to the liquid crystal layer than the white charged particles; and
implementing a specific color by adjusting a segment of the liquid crystal layer corresponding to a specific pixel of the plurality of pixels by not applying the color voltage, such that the segment of the liquid crystal layer is in the planar state, and by having the black charged particles of the electronic ink layer of all of the plurality of pixels positioned closer to the liquid crystal layer than the white charged particles,
wherein the implementing of the white, the implementing of the black, and the implementing of the specific color are performed at different times.
2. The method as claimed in claim 1 , wherein the specific color implemented in the specific pixel is the same as a color of the liquid molecules of the liquid crystal layer corresponding to the specific pixel.