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M7232 Datasheet(PDF) 9 Page - Intersil Corporation

Part # M7232
Description  Numeric/Alphanumeric Triplexed LCD Display Drivers
PDF  16 Pages
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

M7232 Datasheet(HTML) 9 Page - Intersil Corporation

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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 VP/3 and that
the RMS ON voltage is always 1.92VPEAK/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.
VDD
VH
VL
VDISP
VDD
VH
VL
VDISP
VDD
VH
VL
VDISP
VDD
VH
VL
VDISP
VDD
VH
VL
VDISP
VDD
VH
VL
VDISP
VDD
VH
VL
VDISP
BP1
BP2
BP3
ALL ON
a, g ON
d OFF
a SEGMENT
ON
a, d OFF
SEGMENT
LINE
ALL OFF
φ1 φ2 φ3 φ1´ φ2´ φ3´
VP
VDD
VH
VL
VDISP
ON CHIP
RESISTOR
STRING
~75k
Ω
~75k
Ω
~75k
Ω
INPUT
COMMON LINE
WAVEFORMS
TYPICAL
SEGMENT LINE
WAVEFORMS
PIN 2
NOTES:
1.
φ1, φ2, φ3, - BP High with Respect to Segment.
2.
φ1´, φ2´, φ3´, - BP Low with Respect to Segment.
3. BP1 Active during
φ1, and φ1´.
4. BP2 Active during
φ2, and φ2´.
5. BP3 Active during
φ3, and φ3´.
FIGURE 5. DISPLAY VOLTAGE WAVEFORMS
BP1
BP2
BP3
f
e
an2
a
g
d
b
c
an1
SEGMENT
LINES
FIGURE 6. DISPLAY SCHEMATIC
φ1 φ2 φ3 φ1´ φ2´ φ3´
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
VP
3
--------
V
RMSOFF
==
V
RMS
11
3
----------
VP
3
--------
×
V
RMSON
==
NOTES:
1.
φ1, φ2, φ3, - BP High with Respect to Segment.
2.
φ1´, φ2´, φ3´, - BP Low with Respect to Segment.
3. BP1 Active during
φ1, and φ1´.
4. BP2 Active during
φ2, and φ2´.
5. BP3 Active during
φ3, and φ3´.
FIGURE 7. VOLTAGE WAVEFORMS ON SEGMENT g(VG)
Voltage Contrast Ratio
V
RMSON
V
RMSOFF
------------------------------
11
3
----------
1.92
==
=
ICM7231, ICM7232



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