HD66787 Datasheet, PDF (21/159 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
DISPTMG, and SFTCLK) are generated internally, and a part of the signals is output through a level
transforming circuit.
8. Oscillation Circuit (OSC)
The HD66787 can provide R-C oscillation simply by placing an external oscillation-resistor between OSC1
and OSC2 pins. An appropriate oscillation frequency for operating voltage, display size, and frame
frequency can be obtained by adjusting the external-resistor value. Clock pulses can be supplied externally.
Since R-C oscillation is halted during the standby mode, current consumption will be reduced. For details,
see the “Oscillation Circuit” section.
9. LCD Driver Circuit
The LCD driver circuit of HD66787 consists of a 528-output source driver (S1 ~ S528). Display pattern
data are latched when 528-bit data arrive. The latched data controls the source driver and generates drive
waveforms. The shift direction of outputting 528 bits from source driver is changeable with the SS bit.
Select an appropriate shift direction for an assembly.
10. LCD Drive Power Supply Circuit
The LCD drive power supply circuit of HD66787 generates voltages V0, V31P, V31N, VGH, and Vcom
required for driving LCD.
11. LTPS Panel Interface Circuit
LTPS Panel Interface Circuit level-shifts and outputs display clock signal to control LTPS (gate-less) panel.
Output pins arranged on both sides of the LSI allow flexible panel design. The LSEL22-20 pins allows a
combination of display clocks from SOUT24-21 and the LSEL12-10 pins allows a combination of display
clocks from SOUT14-11.
Rev.0.22, May.23.2003, page 21 of 159