PURPOSE: To reduce a current to a scanning electrode and to reduce power consumption in the scanning electrode by applying a signal voltage to adjacent signal electrodes connected to a common scanning electrode while shifting timing in a horizontal scanning interval.

CONSTITUTION: By contriving a modulation method of light emitting elements A, B for one scanning electrode 10 and shortening a period when adjacent light emitting elements A, B emit simultaneously, the peak current to the scanning electrode 10 is reduced. That is, this system is constituted so that the signal electrodes 12, 14 are connected to the scanning electrode 10 through the light emitting elements A, B, and when the same data are displayed by the light emitting elements A, B, the period when the elements A, B emit simultaneously is reduced as shown in figures (B)-(D) as to the drive timing of one display period of the elements A, B. By adopting the drive timing of such figures (B)-(D), the current (i) flowing to the scanning electrode 10 is reduced, and thus, power consumption is reduced.