UPD161622 NEC, UPD161622 Datasheet - Page 39

• Manufacturer Part Number: UPD161622
• Description: 396 OUTPUT TFT-LCD SOURCE DRIVER
• Manufacturer: NEC

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5.9 -Curve Correction Power Supply Circuit
LCD characteristics, no external components are necessary. This power circuit has white level and black level
reference voltage generators on the positive and negative polarity sides, and also supports unbalanced driving. The
reference voltage generators consist of a D/A converter and an operational amplifier and divide V
level of voltage can be selected by using the contrast value setting registers (R36 to R39)
The
PD161622 includes a -curve correction power supply circuit. If the internal -curve correction matches the
(R36)
(R37)
(R38)
(R39)
D/A
D/A
D/A
D/A
00H : SW ON
00H : SW ON
Figure 5–22. -Curve Correction Circuit
AMP OFF
AMP OFF
Data Sheet S15649EJ2V0DS
VNH
VPH
V
VPL
VNL
V
SS
S
V
SS
V
S
SNH1
SNH2
SPH2
SNL2
SPH1
SNL1
SPL1
SPL2
custom
S
to V
PD161622
SS
VRH
V
V
VRL1
VRL2
by 256. One
0
5
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