The TN technology, Twisted Nematic (TN), is the basic technology for generating high- contrast displays on LCD displays. There are different techniques to increase the contrast. These include Multi-Domain Vertical Alignment( MVA), Pattern Vertical Alignment(PVA) and Polymer Stabilized Vertical Alignment( PSVA).
The increase in contrast values of the various alignment technologies is supplemented by polarization filters and reflection techniques. PVA (Patterned Vertical Alignment) technology is one such technology that increases the contrast ratio to over 3,000:1 compared to TN technology (800:1). However, PVA technology is more sluggishthan TN technology and is therefore less suitable for moving image displays. It is often operated with dithering and variable refresh rate.
Super PVA (S-PVA) is an improved variant of Pattern Vertical Alignment (PVA) that supports 8-bit and even 16-bit color resolution, and greatly eliminates glowing. In addition, the S-PVA technology has a response time of about 5 ms. Also improved is the already wide viewing angle, which is said to be 180 degrees in horizontal and vertical direction.