Vertically Aligned Twisted Nematic is only available in negative mode (light colored letters on a dark/black background). VATN displays produce very bright segments and can be easily read.
These LCD Material have a similar structure like TN materials. The extra films added to these crystals allow the leakage to be below 5% in negative polarization. In this way VATN LCD Indicators provide high contrast and viewing angle. Image quality are very close to high contrast OLED displays.