參數(shù)資料
型號(hào)： EM65240
英文描述： Graphic STN LCD Drivers
中文描述： 圖形STN液晶顯示器驅(qū)動(dòng)
文件頁(yè)數(shù)： 9/29頁(yè)
文件大?。?/td> 451K
代理商： EM65240
EM65240
240 COM/SEG Dot Matrix LCD Driver
* This specification are subject to be changed without notice.
4.8.2002
17
When connecting the power supply, show the following recommend sequence.
DD
V
SS
V
DD
V
SS
V
SS
V
DD
V
DD
V
0
V
/DSPOF
Figure 10
Drive by operational amplifier
In graphic displays, the size of the liquid crystal becomes larger and the display duty ratio
becomes smaller, so the stability of liquid crystal drive level is more important than a small
display system.
Since the liquid crystal for graphic display is large and has many picture elements, the load
capacitance becomes large. The high impedance of power supply for liquid crystal drive
produce distortion in the drive waveforms, and degrades display quality. For the reason, the
liquid crystal drive level impedance should be reduced with operational amplifiers.
Range of Operating Voltage: V0
It is necessary to set the voltage for V0 within the VDD operating voltage range shown in the
diagram below.
O p er at in g v o ltag e r a n g e
2.0
2 .5
10
20
30
40
42
3.0
4 .0
5.0
5 .5
VDD ( V )
V0 ( V )
Figure 11
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