The present invention provides a liquid crystal display device which can effectively reduce electromagnetic radiation caused by clock signals or data signals. In a liquid crystal display device, a timing controller outputs a clock signal and a reverse clock signal. The clock signal and the reverse clock signal are transmitted to a clock signal line and a reverse clock signal line arranged in parallel to each other. The clock signal line is connected to normal terminals of data driver ICs, and the reverse clock signal line is connected to dummy terminals of the data driver ICs.