A display apparatus includes a frame memory storing an input image signal having first and second reference blank durations respectively corresponding to a first frame and a second frame. A blank controller circuit determines a second delay blank duration based on the first and second reference blank durations and a first delay blank duration, a signal delay part generates an output image signal having the first and second delay blank durations corresponding to the first frame and second frame, respectively, is based on the stored input image signal, and a display panel displays an image based on the output image signal. The display apparatus may reduce or prevent flicker caused by variations in driving frequency that may be variable on a per-frame basis. A blank duration of a frame is controller, or a frame may be inserted in a blank duration based on blank durations of adjacent frames.