A liquid crystal display of a three TFT structure includes arrayed pixel units, a data drive chip, a row drive chip, a timing controller, and a discharge module. The discharge module includes control terminals and voltage output terminals. The control terminals of the discharge module are respectively connected to control terminals of the timing controller. The first pixel unit includes three TFTs, a first liquid crystal display unit, and a second liquid crystal display unit. The three TFTs include a main TFT, a sub TFT, and a shared TFT. The voltage output terminal of the discharge module supplies a first discharge voltage when the first pixel unit is in the state of positive polarity driving and supplies a second discharge voltage when the first pixel unit is in the state of negative polarity driving. The first and second discharge voltages are both greater than a voltage of the common electrode.