S1D12200 Epson Electronics America, Inc., S1D12200 Datasheet - Page 26

• Manufacturer Part Number: S1D12200
• Description: S1d12000 Series Lcd Driver Ic Technical Manual Technical Manual
• Manufacturer: Epson Electronics America, Inc.

The electronic volume function allows to control the
liquid crystal drive voltage V
thus to adjust density of the liquid crystal display.
Liquid crystal drive voltage V
voltage values if 5-bit data is set to the electronic volume
register.
When the electronic volume function is not used, select (0, 0, 0, 0, 0) for the electronic volume register.
Rev. 1.4
[Sample constants setting when electronic volume function is used]
Voltage Regulation Circuit Using Electronic Volume
Function
V
Where V
5
= (1 + R
EV
x = n (n = 0.1 – 31)
R
= V
b
a
= V
) • V
REG
REG
No.
30
31
EV
/ 150
0
1
2
3
•
•
– x
5
...............................
with the commands and
5
Electronic volume register
can have one of 32
(0, 0, 0, 0, 0)
(0, 0, 0, 0, 1)
(0, 0, 0, 1, 0)
(0, 0, 0, 1, 1)
(1, 1, 1, 1, 0)
(1, 1, 1, 1, 1)
2
•
•
EPSON
V
R
R
a
V
0
When using the electronic volume function, you need to
turn the voltage regulation circuit on using the supply
control command.
30
31
1
2
3
V
x
0
•
•
REG
R
b
Large
Small
V
•
•
•
•
•
•
5
n
0
V
EV
+
-
V
DD
S1D12200 Series
2–17
V
5