Driving method of electrophoretic display device, and controller

A controller for controlling an electrophoretic display device, which has a plurality of pixels where an electrophoretic layer is interposed between a first electrode and a second electrode, and when in a case when the potential of the first electrode is higher than the potential of the second electrode, a first polarity is set, and in a case when the potential of the first electrode is lower than the potential of the second electrode, a second polarity is set, as a display state of the pixel, a first display state is selected by supplying a voltage with the first polarity to the pixel and a second display state is selected by supplying a voltage with the second polarity to the pixel, and a halftone state between the first display state and the second display state is selected according to a duration of the voltage pulse supplied to the pixel, the controller executing a driving method comprising:

• supplying a first voltage pulse with one polarity of the first polarity or the second polarity to a first pixel in a third display state between the first display state and the second display state out of the plurality of pixels;
• supplying a second voltage pulse with the other polarity of the first polarity or the second polarity to the first pixel;
• supplying a third voltage pulse, which has the same polarity as the polarity of the first voltage pulse and has a duration different from a duration of the first voltage pulse, to a second pixel which is in the third display state out of the plurality of pixels;
• and
• supplying the second voltage pulse to the second pixel.