Patent ID: 9697782
Date: 2017-07-04
CPC Classifications: G09G

Claim:
1. A polarity reversal driving method for liquid crystal display panel, wherein a polarity reversal driving period comprises four frames and any one of the four frames can be a start frame, and images are scanned and displayed in a forward or backward order of the four frames; wherein during the polarity reversal driving period, the polarity arrangement manners of a first frame and a third frame are same, while their polarities are opposite; the polarity arrangement manners of a second frame and a fourth frame are same, while their polarities are opposite, and the polarity arrangement manner of the first frame is different from that of the second frame; wherein for the polarity arrangement manner of the first frame and that of the second frame, there are two cases as follows: case a) in which the polarity arrangement manner in a first column of the first frame is negative, positive, positive, negative, positive, negative, negative, and positive, and the polarity arrangement manner in a first column of the second frame is positive, negative, positive, negative, negative, positive, negative, and positive; and case b) in which the polarity arrangement manner in the first column of the first frame is negative, positive, positive, negative, positive, positive, negative, and negative, and the polarity arrangement manner in the first column of the second frame is positive, positive, negative, negative, negative, positive, negative, and positive; the polarity reversal driving method comprises: receiving a first polarity reversal signal and a timing signal clock to generate a second polarity reversal signal, wherein the second polarity reversal signal lags the first polarity reversal signal by a clock period of the timing signal clock; performing a logic operation on the second polarity reversal signal to generate a third polarity reversal signal; selecting a first switching pulse as an active switching pulse during the first frame; selecting a second switching pulse as the active switching pulse during the second frame; selecting the second polarity reversal signal or the third polarity reversal signal to generate a fourth polarity reversal signal when the active switching pulse is at a high level, and selecting the third polarity reversal signal or the first polarity reversal signal to generate the fourth polarity reversal signal when the active switching pulse is at a low level, wherein the forth polarity reversal signal is configured to control the polarity of the first column; a period of the active switching pulse is equal to a polarity arrangement period, and a period of the first polarity reversal signal is half of the polarity arrangement period.