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Because liquid crystal molecules have another characteristic, they cannot be fixed at a certain voltage, otherwise, it ’s been a long time. Even if the voltage is cancelled, the liquid crystal molecules could not be rotated due to the change of the electrical characteristics because of the destruction of the characteristics. Form different gray scales. Therefore, at regular intervals, the voltage must be restored to its original state to prevent the characteristics of the liquid crystal molecules from being damaged.
But what if the screen keeps moving, that is to say, when the screen displays the same gray level at one time? So the display voltage in the LCD is divided into two polarities, one is positive, and the other is negative. Sex.