Patent ID: 8354994
Filing Date: 2013-01-15
Classification: G02F,G09G

Abstract:
1. An electrophoretic display device comprising: a first substrate having a first electrode; a second substrate having a second electrode and arranged in confrontation with the first substrate, the first substrate and the second substrate forming a space therebetween, the first electrode and the second electrode being configured to generate an electric field having a direction, the direction being changeable depending on an electric voltage applied between the first electrode and the second electrode; a display section provided in the space; a dispersion medium filled in the display section and dispersed with a plurality of electrically-charged particles that migrates in accordance with the direction of the electric field; an image forming section that, upon receiving an image forming request, applies the electric voltage between the first electrode and the second electrode to generate the electric field in the dispersion medium, thereby performing an image forming operation; a refresh controlling section that, before the image forming section performs the image forming operation, switches the direction of the electric field alternately at predetermined timing to uniformly disperse the plurality of electrically-charged particles in the dispersion medium, thereby performing a refresh operation; an image-formation-elapsed-time measuring section that measures a first elapsed time from a previous image forming operation performed by the image forming section until the image forming request; a refresh determining section that determines whether the refresh controlling section performs the refresh operation based on the first elapsed time; and a refresh-elapsed-time measuring section that measures a second elapsed time from a previous refresh operation performed by the refresh controlling section until the image forming request, wherein the refresh determining section determines whether the refresh controlling section performs the refresh operation based on both the first elapsed time and the second elapsed time.