Display device for varying different scan ratios for displaying moving and still images and a driving method thereof

A method for driving a display device including a display panel displaying a moving image and a still image, and a signal controller controlling signals to drive the display panel, the method comprising:

• displaying, at the display panel, the moving image with a first scan ratio;
• receiving, at the signal controller, a still image start signal and image data of a still image, and storing the image data of the still image in a frame memory of the signal controller;
• supplying, in response to the still image start signal, the image data of the still image stored in the frame memory to the display panel;
• displaying, at the display panel, the still image with a second scan ratio that is lower than the first scan ratio;
• and
• controlling, with the signal controller, a width of a gate clock (CPV) signal to be the same when the display panel is driven with the second scan ratio and when the display panel is drives with the first scan ratio,
• wherein the signal controller controls the width of the CPV signal to have the same width as a clock signal of n pulses when the display panel is driven with the first scan ratio, and the width of the CPV signal have the same width as a clock signal of m pulses, which is less than n pulses, when the display panel is driven with the second scan ratio,
• wherein n and m are integers greater than 0.

A display device, comprising:

• a display panel that displays a still image and a moving image;
• a signal controller that drives the display panel and includes a frame memory that stores image data of the still image;
• and
• a graphics processing unit (GPU) that provides the image data of the still image at a first frame rate to the signal controller and provides image data of the moving image at a second frame rate to the signal controller,
• wherein, in a first frame in which the GPU switches from the first frame rate to the second frame rate, the image data of the still image is displayed to the end of the first frame,
• the signal controller controls a width of a gate clock (CPV) signal to be the same when the display panel is driven with the first frame rate and the second frame rate,
• the signal controller controls the width of the CPV signal to have the same width as a clock signal of n pulses when the display panel is driven with the second frame rate, and
• the width of the CPV signal to have the same width as a clock signal of m pulses, which is less than the n pulses, when the display panel is with the first frame rate, and
• wherein n and m are integers greater than 0.