Table of Contents
Advertisement
System of LCD Display
In Fig. 20, the voltage of the data line (Y2) is supplied in the positive direction to a common electrode
(DC drive). In practice a uniform AC voltage is supplied to the common electrode (AC drive) to prolong
the life of the liquid crystal.
TFT
Pixel
Electrode
Glass Plate
(Common)
Liquid
Crystal
Glass Plate
(TFT)
Video Data
Variable
Processor
Voltage
X1
Y2
In practice, driven by AC signal
to COMMON. (AC Drive)
Data Line Drive Circuit (Y row)
Y
Y
Y
Y
0
1
2
X Direction
Y Direction
TFT: On (X1, Y2)
Y2
Y2
Y2
Y2
Y
3 • • •
n-
1
COMMON
Timming Controller
(Scan Converter)
COMMON
TFT: On
TFT: Off
Fig. 20
LCD Drive Circuit (Normally White Type)
-20-
Training Manual Principle of LCD
X0
X1
X2
X3
X
n-
1
Power
Circuit
COMMON
Brightness
of Screen
Advertisement
Table of Contents
