A driving unit includes a timing controller, a data driver having a data processor and a switching circuit, and a gate driver. The timing controller outputs image data, a data control signal, a gate control signal and a switching signal. The data processor converts the image data into a data voltage based on the data control signal, and the switching circuit receives the data voltage and a common voltage having a predetermined period and outputs either the common voltage or the data voltage in response to the switching signal. The gate driver outputs a gate voltage in response to the gate control signal. The timing controller outputs the switching signal at a time point in a first half period of a transition period of the common voltage, and the switching circuit outputs the common voltage at the time point.