PVA and TN Matrix

[ZombieJesus]

How does a PVA TFT Matrix refresh its pixels? I heard response time is longest when it is doing black to white transitions. The smaller the angle is between the two states the faster the pixel changes state. Or is it that the size of the angle is proportional to the voltage being applied to the pixel? Thus a lower voltage is used for smaller angles and the transition is just as slow. How does the way a PVA Matrix refresh pixels compare to the way a TN Matrix changes the state of its pixels?