參數(shù)資料
型號(hào)： ICM7231BFIPL
廠商： INTERSIL CORP
元件分類： 顯示驅(qū)動(dòng)器
英文描述： Numeric/Alphanumeric Triplexed LCD Display Drivers
中文描述： LIQUID CRYSTAL DISPLAY DRIVER, PDIP40
封裝： PLASTIC, DIP-40
文件頁(yè)數(shù)： 9/16頁(yè)
文件大?。?/td> 103K
代理商： ICM7231BFIPL
9-27
The degree of polarization of the liquid crystal material and
thus the contrast of any intersection depends on the RMS
voltage across the intersection capacitance. Note from
Figure 7 that the RMS OFF voltage is always V
P
/3 and that
the RMS ON voltage is always 1.92V
PEAK
/3.
For a
1
/
3
multiplexed LCD, the ratio of RMS ON to OFF
voltages is fixed at 1.92, achieving adequate display contrast
with this ratio of applied RMS voltage makes some demands
on the liquid crystal material used.
V
DD
V
H
V
L
V
DISP
V
DD
V
H
V
L
V
DISP
V
DD
V
H
V
L
V
DISP
V
DD
V
H
V
L
V
DISP
V
DD
V
H
V
L
V
DISP
V
DD
V
H
V
L
V
DISP
V
DD
V
H
V
L
V
DISP
BP1
BP2
BP3
ALL ON
a
,
g
ON
d OFF
a
SEGMENT
ON
a
,
d
OFF
SEGMENT
LINE
ALL OFF
φ
1
φ
2
φ
3
φ
1′
φ
2′
φ
3′
V
P
V
DD
~
75k
V
H
~
75k
V
L
~
75k
PIN 2
V
DISP
ON CHIP
RESISTOR
STRING
INPUT
COMMON LINE
WAVEFORMS
TYPICAL
SEGMENT LINE
WAVEFORMS
NOTES:
1.
φ
1,
φ
2,
φ
3, - BP High with Respect to Segment.
2.
φ
1′,
φ
2′,
φ
3′, - BP Low with Respect to Segment.
3. BP1 Active during
φ
1, and
φ
1′.
4. BP2 Active during
φ
2, and
φ
2′.
5. BP3 Active during
φ
3, and
φ
3′.
FIGURE 5. DISPLAY VOLTAGE WAVEFORMS
BP1
BP2
BP3
f
e
an
2
a
g
d
b
c
an
1
SEGMENT
LINES
FIGURE 6. DISPLAY SCHEMATIC
φ
1
φ
2
φ
3
φ
1′
φ
2′
φ
3′
ALL ON
a, g ON
d OFF
a SEGMENT
ON
a, d OFF
ALL OFF
+VP
0
-VP
+VP
0
-VP
+VP
0
-VP
+VP
0
-VP
VP = (V+) - VDISP
V
RMS
-------
V
RMS
OFF
=
=
V
RMS
3
----------
-------
×
V
RMS
ON
=
=
NOTES:
1.
φ
1,
φ
2,
φ
3, - BP High with Respect to Segment.
2.
φ
1′,
φ
2′,
φ
3′, - BP Low with Respect to Segment.
3. BP1 Active during
φ
1, and
φ
1′.
4. BP2 Active during
φ
2, and
φ
2′.
5. BP3 Active during
φ
3, and
φ
3′.
FIGURE 7. VOLTAGE WAVEFORMS ON SEGMENT g(V
G
)
Voltage Contrast Ratio
V
ON
RMS
-----------------------------
3
----------
1.92
=
=
=
ICM7231, ICM7232
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