NJU6538
(7) LCD panel drive
(7-1) LCD driving voltage generation circuit
LCD driving voltage generation circuit generates LCD driving bias voltages VLCD2, V0, V1 and V2. It
adjusts the voltage by 8 steps electrical volume from VLCD1 and allots the voltage to VLCD2, V0, V1 and V2
by resistor-voltage-dividing as shown in below.
VLCD1, VLCD2, V0, V1 and V2 terminals requires external capacitors for bias voltage stabilization
for display quality. These values of capacitors should be fixed in accordance with evaluation in the
application.
Power
Supply
VLCD
Duty ratio
Bias
1/8,1/9,1/10
1/4
VLCD2-VSS
VLCD1
VLCD2
V0
V1
V2
+
VSS
+
+
+
+
Internal NJU6538
E.V.R. (16-steps)
10kΩ (Note 1)
10kΩ (Note 1)
10kΩ (Note 1)
10kΩ (Note 1)
VLCD
10kΩ (Note 1)
Note 1 : Resistor is typical value.
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Ver.2003-05-09