Patent ID: 8493317

Claim:
A reflection type display apparatus comprising: a light modulating layer having a first electrode having a light transmitting property on which an electroplating can be deposited, a second electrode disposed, in opposition to the first electrode, on a reflecting plate for reflecting light of a certain wavelength band, and an electrolytic solution containing a metal ion arranged in contact with the first and second electrodes, wherein the metal ion is silver ion or zinc ion, according to a density of current at an interface between the first electrode and the electrolytic solution, the light modulating layer controls a light transmitting ratio and a reflection ratio; and a control unit for setting a direction and the density of the current, wherein the control unit sets the density of the current at a first current density equal to a threshold current density or smaller than and approximately equal to the threshold current density at the time of depositing the electroplating of a black color, sets the density of the current at a second current density smaller than the first current density at the time of depositing the electroplating of a white color, and sets the current to flow in a direction opposite to a direction of the current for forming the electroplating so that the electroplating disappears, and the electroplating of the white color is smooth and the electroplating of the black color is rough; wherein the reflecting plate is a multilayered dielectric film.