Abstract
A novel electronic reflective display by an electrical movement of conductive toner has been investigated. The sandwich type display cell consists of two ITO (Indium Tin Oxide) plates coated with charge transport layer (CTL) and a spacer. There are conductive toners and dielectric white particles in this display cell. In this display, toner movement is controlled by the change of an external electric field applied between two ITO electrodes. The conductive toners in contact with the CTL on the anode are charged positively by the hole injection from the CTL, and then move to the cathode by a coulomb attraction. In addition, the toners can move to the counter electrode by an applying a reverse electric field and the cell displays the white by the light scattering of white particles. The cell displays the black and white pixel by switching of electrical polarity. The reflection density in the image area to display black was 0.9, and it was 0.6 in the non-image area to display white. The maximum contrast was obtained when mixing weight ratio of the conductive toner to the white particle is 1:1.
