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System of LCD Display
Liquid
Crystal
In the dynamic drive system, since the electric signal (voltage) is supplied to the Y electrode and the X
electrode in sequence, the number of pixels which makes all pixels (the total number of pixels are "X x
Y") turn on or off becomes "X+Y". Therefore, compared with the static drive system that has an indepen-
dent electrode for each pixel, the number of electrodes of the dynamic drive system is very few.
However, with this dynamic drive system, since the electrode itself is the wiring, it has resistance that
cannot be disregarded in the big screens. This resistance causes the speed of the shutter to become
slower. Therefore, when displaying moving pictures etc., an afterimage is generated.
This passive matrix system is not suitable for LCD televisions with big screens that require moving pic-
tures and high resolution.
The active matrix system was developed in order to overcome these faults.
Y
1
LCD shutter is turned on
or turned off in this
address (X2, Y1).
X
2
-17-
Training Manual Principle of LCD
Y
Y
Y
0
1
2
X
1
X
2
X
3
Fig. 15
Passive Matrix System
X
0
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