S1C63358 TECHNICAL MANUAL
EPSON
61
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
(3) LCD drive bias/power supply
The LCD drive method can be selected from a 1/3 bias drive (V
SS
, V
C1
, V
C2
, V
C3
) or a 1/2 bias drive
(V
SS
, V
C1
= V
C2
, V
C3
).
For the LCD system power supply, either "internal" power (to generate internally) or "external" power
(to supply from outside of the IC) can be selected. When "external" power is selected, the specified
LCD drive voltage terminal (V
C1
, V
C2
or V
C3
) is connected to the V
DD
inside the IC according to the
selected mask option.
• 1/3 bias
• 1/2 bias
Internal
V
C1
3.0 V LCD
V
C1
= V
DD
4.5 V LCD
External
V
C2
= V
DD
4.5 V LCD
V
C3
= V
DD
3.0 V LCD
Internal
V
C1
×
V
C1
= V
DD
3.0 V LCD
External
V
C2
= V
DD
×
V
C3
= V
DD
3.0 V LCD
Combinations that are marked with an "
×
" cannot be selected.
When the voltage regurator in the LCD system voltage circuit is disabled by setting the mask option,
external elements can be minimized because one or two external capacitors for V
C1
to V
C3
are not
necessary. However when the LCD system voltage regurator is not used, the display quality of the
LCD panel, when the supply voltage fluctuates (drops), is inferior to when the LCD system voltage
regurator is used.
Figure 4.8.4.2 shows the external elements when the the LCD system voltage regurator is not used.
V
DD
V
C1
V
C2
V
C3
CA
CB
V
SS
1.5 V
<4.5 V LCD panel>
1/4, 1/3, 1/2 duty, 1/3 bias
Note: V
C1
is shorted to V
DD
inside the IC.
1/4, 1/3, 1/2 duty, 1/3 bias
Note: V
C2
is shorted to V
DD
inside the IC.
<3.0 V LCD panel>
1/4, 1/3, 1/2 duty, 1/3 bias
Note: V
C3
is shorted to V
DD
inside the IC.
1/4, 1/3, 1/2 duty, 1/2 bias
Note: V
C3
is shorted to V
DD
inside the IC.
1/4, 1/3, 1/2 duty, 1/2 bias
Note: V
C1
is shorted to V
DD
inside the IC.
V
DD
V
C1
V
C2
V
C3
CA
CB
V
SS
3.0 V
V
DD
V
C1
V
C2
V
C3
CA
CB
V
SS
3.0 V
V
DD
V
C1
V
C2
V
C3
CA
CB
V
SS
3.0 V
V
DD
V
C1
V
C2
V
C3
CA
CB
V
SS
1.5 V
C
4
C
5
C
1
C
3
C
5
C
1
C
3
C
4
C
1
C
5
C
1
C
3
C
1
Fig. 4.8.4.2 External elements when LCD system voltage regurator is not used
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