Liquid crystal display device compensating for common voltage and method of driving the same

摘要

There is provided a driving method of a liquid crystal display device that is driven by an inversion method, including: calculating a total sum of changed amounts of data voltages between an (n−1)-th row line and an n-th row line, using image data of the (n−1)-th row line and image data of the n-th row line; generating common voltage data according to the total sum of the changed amounts of the data voltages; compensating for the common voltage data using a characteristic parameter of a liquid crystal panel; and generating a common voltage according to the compensated common voltage data, and outputting the common voltage to the liquid crystal panel.

主权项

1. A driving method of a liquid crystal display device that is driven by an inversion method, the driving method comprising:
calculating a total sum of changed amounts of data voltages between an (n−1)-th row line and an n-th row line, using image data of the (n−1)-th row line and image data of the n-th row line; estimating a ripple component of a common voltage at a gate voltage off timing of the n-th row line based on the total sum of the changed amounts of the data voltages; generating common voltage data according to the estimated ripple component of the common voltage; reflecting a characteristic parameter of a liquid crystal panel into the common voltage data; and generating a common voltage according to the common voltage data to which the characteristic parameter is reflected into, and outputting the common voltage to the liquid crystal panel, wherein when it is estimated that no ripple component exists at the gate voltage off timing, the common voltage data corresponding to a normal level of a common voltage is generated for an entire output timing of the data voltage to the n-th row line until the gate voltage off timing, wherein when it is estimated that the ripple component exists at the gate voltage off timing, the common voltage data corresponding to a level of a common voltage capable of compensating for the ripple component is generated that reflects the characteristic parameter at the gate voltage off timing, the generated level of the common voltage having a polarity that is opposite to that of the ripple component at the gate voltage off timing, wherein the common voltage data corresponding to the level of the common voltage capable of compensating for the ripple component is generated for a period of time so that the gate voltage off timing occurs at an intermediate point of time during the period of time, and wherein the common voltage data corresponding to a level of a common voltage that is capable of compensating for the ripple component is a level of the common voltage that is higher or lower than the normal level of the common voltage.