Patent ID: 7185986

Claim:
In a projection type video display apparatus comprising light deflection means for circularly scrolling and irradiating irradiated light with a pattern having a circular arc shape which is an inverted U shape in a direction, perpendicular to the line direction, in which the writing of data progresses on a hold-type display panel, a projection type video display apparatus comprising by-area overdrive control means for taking overdrive control for emphasizing an input value which is carried out with respect to an input signal corresponding to an area at the center of the width of the hold-type display panel as reference overdrive control, to carry out by-area overdrive control, in which the farther an area is away from the center of the width of the hold-type display panel in the horizontal direction, the higher the degree of emphasis of an input value is made, as compared with that in the reference overdrive control, with respect to an input signal corresponding to the area.