Display device including first and second scanning signal line groups

An active-matrix display device for providing gradation display of video, comprising:

• a display portion including a plurality of scanning signal lines, a plurality of video signal lines crossing the scanning signal lines, and pixel formation portions arranged in a matrix at corresponding intersections of the scanning signal lines and the video signal lines, the pixel formation portions each including a switching element to be brought into on or off state in accordance with a signal applied to a corresponding scanning signal line;
• a scanning signal line driver circuit for selectively activating the scanning signal lines;
• a video signal line driver circuit for applying a video signal representing video to be displayed to the video signal lines;
• a first power supply for outputting a first voltage;
• a second power supply for outputting a second voltage;
• and
• a third power supply for outputting a third voltage, wherein,
• the scanning signal lines include first and second scanning signal line groups each including of a plurality of adjacent scanning signal lines,
• the scanning signal line driver circuit includes a first scanning signal line driver circuit for activating the first scanning signal line group and a second scanning signal line driver circuit for activating the second scanning signal line group,
• the first and second scanning signal line driver circuits simultaneously apply a predetermined pulse to a respective one of the first and second scanning signal line groups during a period in which the respective one of the scanning signal line groups is not active and the other scanning signal line group is active, the predetermined pulse having the same polarity as an off voltage for bringing the switching element into off state and being at a higher level than the off voltage, and the scanning signal line driver circuit selectively applies the first, second, and third voltages to the scanning signal lines, such that the first voltage brings the switching element into on state, the second voltage brings the switching element into off state, and the third voltage eliminates a charge accumulated in the pixel formation portion.