Electrolytic deposition display apparatus and drive method thereof

An image display apparatus comprising:

• a plurality of pixels, each including a first electrode, a second electrode disposed in opposition to the first electrode and an electrolytic solution containing metal ion and disposed in contact with the first and second electrodes;
• a control unit for setting a value of a voltage applied between the first and second electrodes, so that a precipitation by an electroplating starts when the value of the voltage between the first and second electrodes exceeds a deposition overvoltage value, and the precipitation by the electroplating ends when, after the precipitation by the electroplating starts, the value of the voltage between the first and second electrodes is reduced into a predetermined value smaller than the deposition overvoltage value, wherein
• the control unit repeats at lest twice a subfield operation including a first operation for applying selectively to each of the plurality of pixels a voltage of any one of a first voltage value larger than the predetermined value, a second voltage value lager than the first voltage value and smaller than the deposition overvoltage value and a third voltage value lager than the deposition overvoltage value, and a second operation for applying to the plurality of pixels the voltage of the second voltage value after the first operation, and wherein
• the control unit controls a gradation of the pixel according to a timing of applying the voltage of the third voltage value.