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Explanation of Each Block
Shift Register
This is a bi-directional shift register used for transmitting common data. The display data shifts on the
falling edge of LP.
Level Shifter
The level shifter is a voltage level converter circuit which converts the signal voltage level from a logic
system level to the LC driver system voltage level.
LCD Driver
The LCD driver outputs the LC drive voltage.
The relationship between the display blanking signal DOFF, the field recognition signals F1 & F2, the AC
signal FR, and the common output voltage is as follows:
DOFF
FR
F1,F2
1,1
0,1
Line 1
+V
+V
1
Line 2
–V
+V
1
Line 3
+V
–V
1
Line 4
+V
+V
1
Voltage level relationships: + V
MLS Driver Chip Set
Technical Manual
H
L
1,0
0,0
–V
+V
1
1
1
+V
+V
1
1
1
+V
+V
1
1
1
+V
–V
1
1
1
> V
> –V
(V
is the center voltage level)
1
C
1
C
EPSON
H
1,1
0,1
1,0
–V
–V
+V
1
1
1
+V
–V
–V
1
1
1
–V
+V
–V
1
1
1
–V
–V
–V
1
1
1
SED1751
L
—
0,0
—
–V
V
1
C
–V
V
1
C
–V
V
1
C
+V
V
1
C
5–5
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