Patent ID: 9424800
Filing Date: 2016-08-23
CPC Classification: G09G

Claim Text:
1. A driving device of an image display medium comprising: a voltage application unit that varies a voltage applied to a common electrode provided in one of a pair of substrates, and applies a voltage to a pixel electrode provided in the other substrate through active matrix driving, with respect to the image display medium including a plurality of kinds of particles which are sealed between the pair of substrates at least one of which is transparent, are colored in different colors for each kind, and have different threshold characteristics of a voltage required to leave the substrate from a state of being adhered to the substrate for each kind, and displaying an image based on image information; and a controller that controls the voltage application unit such that a voltage is applied between the pair of substrates through a plurality of steps in which voltages for controlling a particle concentration are sequentially applied between the pair of substrates in order in which the threshold characteristics are large, and controls the voltage application unit such that a deviation time generated due to deviation of a scanning timing and a potential difference between the pair of substrates during transition between the steps is gradually decreased and is equal to or less than predefined threshold characteristics of the particles to suppress unnecessary concentration variation of the particles, such that the particles do not move when the potential difference between the pair of substrates in the deviation time is equal to or less than the predefined threshold characteristics of the particles.