Liquid crystal display and method for eliminating afterimage thereof

A liquid crystal display comprising:

• a liquid crystal panel having a plurality of gate lines, a plurality of data lines, a plurality of pixel capacitors to which a common voltage is applied and a plurality of thin film transistors connecting the data lines to the pixel capacitors in response to a gate driving signal supplied to the gate lines;
• a timing controller which supplies a data signal, a data control signal and a gate control signal in response to an external signal;
• a power supply which receives an external power supply voltage, to generate a driving voltage and the common voltage and detects cutoff of the external power supply voltage, to supply a discharge signal related to detection of the cutoff of the external power supply voltage;
• a gate driver which simultaneously supplies the gate driving signal to the plurality of gate lines in response to the discharge signal;
• and
• a first discharger which supplies the common voltage to the plurality of data lines in response to the discharge signal.

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

• detecting a cutoff of external power supply voltage and supplying a discharge signal related to detection of the cutoff of the external power supply voltage;
• simultaneously supplying the gate driving signal to the plurality of gate lines in response to the discharge signal;
• and
• supplying the common voltage to the plurality of data lines in response to the discharge signal.