Display device and driving method thereof

A method of driving a display device, the method comprising:

• receiving a first frame control signal;
• recovering a first internal reference clock signal during a inactive period of the first frame control signal;
• comparing the frequency of the recovered first internal reference clock signal with the frequency of a preset reference clock signal,
• wherein when the frequency of the recovered first internal reference clock signal is within an error range of the frequency of the preset reference clock signal, outputting the recovered first internal reference clock signal;
• receiving a second frame control signal;
• and
• when the second frame control signal corresponds to a previously set CDR unit operating condition, recovering the second internal reference clock signal.

A display device comprising:

• a signal controller that transmits an image signal having an embedded clock signal;
• a data driver includes:
• a clock data recovery (CDR) circuit that recovers from the image data a first internal reference clock signal during an off period of a first frame control signal and when a second frame control signal corresponds to a previously set CDR unit operating condition, the CDR circuit recovers a second internal reference clock signal;
• a memory unit stores a frequency of a preset reference clock signal;
• a comparator compares the frequency of the recovered first internal reference clock signal with the frequency of the preset reference clock signal, outputs the frequency of the recovered first internal reference clock signal, and receives a second frame control signal when the frequency of the recovered first internal reference clock signal is within an error range of the frequency of the preset reference clock signal.