Patent ID: 9448466
Filing Date: 2016-09-20
CPC Classification: G03B,G09G

Claim Text:
1. A display device comprising: a screen including an optical layer of which optical state is changed if voltage is applied to the optical layer, and a first electrode and a second electrode which are opposed to each other to sandwich the optical layer therebetween for applying voltage to the optical layer; and a controller which applies predetermined voltage to the first electrode and the second electrode during a projection period of image light projected onto the screen and which switches the screen between a predetermined image state for scattering the image light and a non-image state which is a different optical state from the image state, wherein the controller applies, to the first electrode, first rectangular wave voltage having cycle which is an integral multiple of cycle during which the optical state of the optical layer is changed, and applies, to the second electrode, second rectangular wave voltage having the same cycle as that of the first rectangular wave voltage and having the same phase as or a phase-half-deviated from the first rectangular wave voltage and pulse voltage which becomes a potential difference between the electrodes of which the optical state is changed when the optical state of the optical layer is changed in a superimposed manner.