Mva (Multi-Domain Vertical Alignment) System - Sanyo TI5110LCD Training Manual

Improvement Technology of LCD Display

6-4 MVA (Multi-domain Vertical Alignment) System

In the MVA system, the (alignment) film is arranged so that the liquid crystal molecules are stood vertical-
ly. The MVA system combines vertical alignment with the Multi-domain system. By vertically aligning the
liquid crystal molecules, the influence of optical interception is lost, and the angle of view and contrast
are improved.
A type of material is used that causes the liquid crystal molecules to become vertical to the glass plate
without supplying voltage. (Nega-Nematic liquid crystal*)
In the MVA system, attaching the boss by resin and making the liquid crystal molecules stand diagonally
on the transparent electrode make multiple alignment domains. Therefore, since the rubbing process can
be skipped at the alignment film production, manufacturing becomes easier compared with the multi-
domain system.
✐
Generally, a Posi-Nematic system is used that aligns the liquid crystal molecules by supplying voltage.
Glass
Plate
(Left) (Right)
Glass
Plate
Polarized
Board
Transparent Electrode
(Common)
Alignment Film
Liquid Crystal Molecule
(Nega-Nematic)
Alignment Film
Boss
Transparent Electrode
(Pixel, TFT)
Polarized
Board
Fig. 24
MVA (Multi-domain Vertical Alignment) System
-24-
Training Manual Principle of LCD