Patent ID: 8717662

Claim:
A display device comprising: a display layer that is provided with a cell in which first particles, second particles, and third particles with different colors from one another are contained; a front side electrode that is provided on the front side of the display layer; and a first back side electrode and a second back side electrode that are provided corresponding to the cell on the back side of the display layer, wherein the first particles are positively or negatively charged, wherein the second particles have 1) a color with a complementary color relation to that of the first particles, 2) an opposite polarity charge to that of the first particles, and 3) a smaller amount of charge than that of the first particles, and a voltage application pattern to the front side electrode, the first back side electrode, and the second back side electrode is selected and the selected voltage pattern is applied, and then the first particles and the second particles are disproportionately located with the third particles are dispersed in the cell, to change a displayed color from the front side, wherein a voltage with the same polarity as that of the first particles is applied to the front side electrode or a voltage with the same polarity as that of the second particles is applied to at least one of the first back side electrode and the second back side electrode, to disproportionately locate the second particles on the front side of the cell and to disproportionately locate the first particles on the back side of the cell, thereby being in a second particle color display state where the color of the second particles is viewed from the front side, a voltage with the opposite polarity to that of the first particles is applied to the first back side electrode and the second back side electrode in the second particle color display state, to move the first particles to the display side of the cell with the second particles disproportionately located on the front side of the cell, and to disproportionately locate the first particles and the second particles on the front side of the cell, thereby being in a black display state where black that is a mixed color of the first particles and the second particles is viewed from the front side, and the first particles and the second particles are disproportionately located on the front side of the cell, and then an alternating voltage is applied between the front side electrode and the first back side electrode and the second back side electrode, to vibrate the first particles and the second particles in the thickness direction of the display layer, thereby being in a mixed state where the first particles and the second particles are mixed.