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Why use finger to press the LCD screen will have a ripple?

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The following figure, liquid crystal display has a variety of arrangement, so there will be a TN screen, IPS screen and so on. Which will easily produce water ripple is TN type, but also the majority of the use of the principle of soft screen, as shown on the right side of the map. Imagine the LCD is a strip club, is mainly the angle changes in vertical direction to change the gray relative. At this time a certain amount of pressure, will change the value of a larger tilt angle. At this time to see the legendary IPS hard screen, why he is not prone to water ripple? Left side of figure. The arrangement of the liquid crystal is the change of the inclination angle in the horizontal direction to change the gray level. At this time the vertical direction of a certain amount of pressure to change the inclination of the smaller. At the same time, the arrangement of the liquid crystal recovery faster than TN much faster, so it is easy to return to normal soon. It needs to be emphasized here is not mainly because of the hard screen, the glass is very hard, so it seems difficult to press the button to press the glass is not difficult to appear ripples. But because of the arrangement of the liquid crystal, the direction of the control of liquid crystal electric field is different, IPS has the ability to use a hard glass screen, and TN type can not be used.