Vertical alignment (VA) technologies for LCD
VA LCD technology increases transmission to give display screens incredible contrast.
The ideal black screen
In VA (vertical alignment) LCDs, homeotropic liquid crystals – i.e.
When no voltage is applied, the homeotropic orientation of the liquid crystals initially produces an almost ideal black state between crossed polarizers. VA displays are therefore characterized by excellent contrast values and are generally operated in normally black mode. This means that the screen is black when no voltage is applied.