Table of Contents
Advertisement
System of LCD Display
5-3 Drive System
The drive systems for LCD display are divided into the following classifications:
The Static Drive System, which is seldom used;
The Passive Matrix System, which is used for still pictures, such as calculators and notebook PCs;
The Active Matrix System, which is suitable for high definition and the high-speed response needed for
big screen LCD television.
Drive System
Classification of LCD Drive System
5-4 Passive Matrix System
In the structure of a passive matrix system, Y electrodes of the vertical direction (Y-direction) are formed
in upper glass plate, and X electrodes of the horizontal direction (X direction) are formed in lower glass
plate as a matrix. The liquid crystal molecules are sandwiched between these electrodes. By supplying
voltage between the Y electrode and the X electrode in sequence, at a certain time, an electric field is
generated in the liquid crystal where the selected Y electrode and X electrode cross. Therefore, the liquid
crystal molecules of this pixel address (X, Y electrode intersection) change arrangement and an LCD
shutter is turned On or Off.
Glass
Plate
Liquid
Crystal
Layer
Glass
Plate
Static Drive System
Dynamic Drive System
Y Electrode
Y
Y
0
1
-16-
Passive Matrix System
Active Matrix System
Y
Y
Y
2
3
4
X
0
X
1
X
2
X Electrode
X
3
X
4
These electrodes are
transparent electrodes.
Fig. 14
Passive Matrix System
Training Manual Principle of LCD
Advertisement
Table of Contents
