349
13.3.6
Boosting the LCD Drive Power Supply
When a large panel is driven, the on-chip power supply capacity may be insufficient. If the power
supply capacity is insufficient when V
CC
is used as the power supply, the power supply
impedance must be reduced. This can be done by connecting bypass capacitors of around 0.1 to
0.3
µ
F to pins V
1
to V
3
, as shown in figure 13.17, or by adding a split-resistance externally.
H8/3827R Series
V
CC
V
SS
V
1
V
2
V
3
R
R
R
R = several k
Ω
to
several M
Ω
C= 0.1 to 0.3mF
V
0
Figure 13.17 Connection of External Split-Resistance