per column inverting Graphic lcd modules way and the way of point-by-point inverter.

 When the display electrode voltage is higher than common electrodes (public) electrode voltage, is called a normal polarity; When the electrode voltage is lower than the common electrode voltage is displayed, is called a negative polarity. Whether positive polarity or negative polarity, there will be a group of gray-scale of the same brightness, so when the differential pressure fluctuation two layers of glass when the absolute value is fixed, shown by gray-scale is the same. But in both cases, the turning of the liquid crystal molecules are completely opposite, also can avoid the above when the liquid crystal molecules to has been fixed in one direction characteristics caused by the destruction. There are four common way of polarity reversal, that is, frame by frame mode inverter, inverter line by line, per column inverting way and the way of point-by-point inverter.
For frame by frame inverting way, in the same frame, the entire picture all adjacent points have the same polarity, and the adjacent frames polarity is different; For inverting way, line by line on the same line have the same polarity, and neighboring lines of different polarity; For each column inverting way, in the same column with the same polarity, and the adjacent columns of different polarity; For point by point inverter, is each point and their adjacent up, down, left, right four points, polarity is different.
The current common personal computer LCD screen, the panel used by polarity transformation way, most of them are point transformation way, why? Reason is the point of the inverter display quality is much better compared with other ways of transformation. Table lists the frame by frame inverter, inverter, line by line per column to pour and pour point by point phase four polar transformation way of performance comparison.