Liquid crystal display with periodical changed voltage difference between data voltage and common voltage and driving method thereof

A liquid crystal display, comprising:

• a plurality of pixel units arranged in a matrix, each pixel unit comprising a pixel electrode and a common electrode;
• wherein an electric field is generated between the pixel electrode and the common electrode of each pixel unit;
• a value of the electric field of each pixel unit is a sum of a main value and an auxiliary value with periodical change;
• an absolute value of the main value is constant;
• an absolute value of the auxiliary value is less than the absolute value of the main value;
• and
• a sum of the auxiliary value is zero in a minimum period.

A driving method of a liquid crystal display, comprising the following steps:

• providing a liquid crystal display comprising a data driving circuit, a common voltage generating circuit, a gamma voltage generating circuit, and a plurality of pixel units arranged in a matrix, each pixel unit comprising a pixel electrode and a common electrode;
• applying a gamma voltage to the data driving circuit;
• applying a common voltage to each common electrode;
• applying a plurality of data voltages to each pixel electrode;
• wherein a voltage difference between the data voltage and the common voltage in each pixel unit is a sum of a main voltage and an auxiliary voltage with periodical change;
• an absolute value of the main voltage is constant;
• an absolute value of the auxiliary voltage is less than the absolute value of the main voltage;
• and
• a sum of the auxiliary voltage is zero in a minimum period.