HD66787 Datasheet, PDF (135/159 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
Pattern Diagram for Voltage Setting
The following figures are the pattern diagram of voltage setting for the HD66787 and the voltage
waveforms.
VLOUT2
VGH (+9 ~ +16.5V)
BT
Vci (2.5 ~ 3.3V)
Vcc (2.4 ~ 3.3V)
IOVcc (1.8 ~ 3.3V)
GND (0V)
VC
Vci1
VLOUT1
VRH
VDV
VCOMG
VLOUT4
BT
DDVDH (4.5 ~ 5.5V)
VREG1OUT (3.0 ~ (DDVDH-0.5)V)
VcomH (3.0 ~ (DDVDH-0.5) V)
VcomL ((VCL+0.5) ~ 1V)
VCL (0 ~ -3.3)V
VLOUT3
VGL (-4.0 ~ -16.5V)
Pattern diagram for voltage setting
Note 1) Voltage drop occurs in relation to set voltage for each DDVDH, VGH, VGL, VCL output depending
on current consumption required for each output. (DDVDH+VREG1OUT) > 0.5V and
(VcomL – VCL) > 0.5V show the relationship in relation to the actual voltage. When AC frequency of
Vcom1 and Vcom2 is high (e.g. alternation occurs by line), current consumption is also large. In this
case, check voltage before use.
Vcom
Sn(Source driver output of HD66787)
Gate Output
Applied voltage to the TFT display
VGH
VDH
VcomH
VcomL
VGL
Rev.0.22, May.23.2003, page 135 of 159