A liquid crystal display and a method of driving the same are disclosed. The liquid crystal display includes a liquid crystal display panel on which data lines and gate lines cross each other, a data driving circuit that converts data of an input image into positive and negative analog data voltages and outputs the data voltages to the data lines, a gate driving circuit sequentially supplying a gate pulse synchronized with the data voltages to the gate lines, and a timing controller that supplies the input image data to the data driving circuit, controls an operation timing of each of the data driving circuit and the gate driving circuit, compares the input image data with a previously stored reference data pattern, and decides whether or not the input image data is the same as the reference data pattern.