OM6208 NXP Semiconductors, OM6208 Datasheet - Page 30

• Manufacturer Part Number: OM6208
• Description: Om6208 65 X 96 Pixels Matrix Grey-scale Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 13 Bias setting levels for p = 4
Each of the eight possible values of alpha results in a
different set of five values for the column voltages.
Bias level F (see Fig.28) is half of the maximum row
voltage level as shown by the equation
Figure 28 also shows that G is used to define the
maximum column voltage level related to the V
2003 feb 10
65 x 96 pixels matrix grey-scale LCD driver
BS2
0
0
0
0
1
1
1
1
is in the range 0.0 to 1.05.
BS1
0
0
1
1
0
0
1
1
BS0
0
1
0
1
0
1
0
1
F
=
V
------------ -
LCD
2
1.000
1.075
1.150
1.225
1.300
1.375
1.450
1.525
handbook, halfpage
F/G
0.00
0.15
0.30
0.45
0.60
0.75
0.90
1.05
F
C
level.
G
Fig.28 Bias system.
4.00
4.30
4.60
4.90
5.20
5.50
5.80
6.10
a
R
R
R
R
R
R
30
Because the voltage level of the row depends on the
programmed bias level, it can be seen that
The situation where F = G occurs only when BS[2:0] is
zero and alpha is zero. In this case R = 0 and G = F;
therefore V
internal buffers are no longer needed and therefore are
switched off to reduce power consumption.
The relationship between F and G is defined by the
parameter a (indicated in Table 13) and p as follows
It can be seen from Fig.28 that
or
The BS[2:0] bias bits can be selected by a command and
also can be programmed by OTP.
V LCD = V row(max)
V 2H
V 1H
V C
V 1L
V 2L
V SS = V row(min)
MGW832
a
2H
=
= V
--- -
G
F
-- -
2
LCD
=
+
1
a
-- -
p
and V
=
p
--- -
G
F
----------------- -
2L
=
+
2
= V
a
-- -
p
2
SS
=
=
, also two of the
1
Product specification
a
-- - 1
p
+
–
-- -
2
OM6208
F G
2