The disclosure is related to a liquid crystal display device, including a liquid crystal display panel and a gamma generator including a first storage unit storing a group of positive or negative gamma voltage values and a second storage unit storing a group of negative or positive gamma voltage values. The gamma generator periodically obtains the group of the positive or negative gamma voltage values, or the group of the positive or negative gamma voltage values according to a control of a polarity inversion signal. The liquid crystal display panel displays an image according to the group of the positive and/or the group of the negative gamma voltage values. The difference between the disclosure and the current technique is that the cost is decreased effectively; meanwhile, the driving structure is simplified, a wiring area is decreased and it is favorable for a narrow frame design.