HD66787 Datasheet, PDF (130/159 Pages) Renesas Technology Corp – 528-channel, One-chip Driver with 262,144-color Display RAM and Power Supply Circuit for Low-temperature Poli-Si TFT (LTPS-TFT) Panels with Incorporat

HD66787
Preliminary
Configuration of Power Generation Circuit
The internal configuration of power generation circuit for driving liquid crystal with the HD66787 is as
follows.
Separate on FPC
in case of COG assembly
SOUT22 SOUT24 SOUT12 SOUT14
VREG1OUT _{SOUT21 SOUT23 SOUT11 SOUT13}
VciLVL
VcomH
voltage
adjsutment
adjustment
external
varialble
resistors)
In case of
using VciOUT
AMP
Vci
Note 2)
Note 2) ^Vci
REGP
Voltage
adjsutment
circuit
Vci
Amplifier 1
VciOUT _VciOUT
AMP
VcomR
Vci1
C11-
C11+
VLOUT1
Step-up
circuit 1
VcomH
Adjustment
Circuit
DDVDH
Level
Shifter
LSEL12
LSEL11
LSEL10
LSEL22
LSEL21
LSEL20
γ _Adjustment
circuit
Source
Driver
Grayscale
voltage
generation
circuit
V0P
V0N
V31P
V31N
VMONI
C12-
C12+
C21-
C21+
C22-
C22+
VLOUT2
VGH
VLOUT3
Step-up
circuit 2
VcomH
Output AMP
VcomH
Vcom
Vcom
amplitude
adjustment
circuit
VcomL
Output AMP
VcomL
TESTA1
TESTA2
TESTA4
Note 1)
VGL
Note 2,3)
VLOUT4
Note 4)
VCL
HD66787
Vcc
GND
Note 1) Connect stabilizing capacitors to the TESTTA1, TEST 2, and TESTA4 panel as required for the display quality of
the panel and voltage consumption (0.1µF, characteristic B). Otherwise, adopt 1µF, characteristic B.
Note 2) Place a shot-key diode (VF = about 0.4V/20mA, VR >=30V).
Note 3) Wiring from GND or VGL to the shot-key dioode must be 10Ω or less.
Note 4) Capacitors are not required when VCOMG = 0 (VCOML = GND).
Power generation circuit
Rev.0.22, May.23.2003, page 130 of 159