HD66781 Datasheet, PDF (53/196 Pages) Renesas Technology Corp – 720-channel Source Driver for a-Si TFT/Low Temperature Poly-Si TFT Panels with 262,144-color display RAM

HD66781
Preliminary
VSYNC interface mode: The internal display operation is synchronized with the frame-synchronizing
signal (VSYNC) in the VSYNC interface mode. By writing data to RAM at a fixed speed on the falling
edge of VSYNC, it enables moving pictures display with a system interface. In this case, there are some
constraints in the RAM write speed and methods. For details, see “External Display Interface” (p.139).
In the VSYNC-I/F mode, only VSYNC input is valid. Other input signals for the external display interface
are invalid.
The front porch (FP), back porch (BP) periods and display period (NL) are automatically generated in
accordance to the frame synchronizing signal (VSYNC) according to the register setting of HD66781.
Rev.0.5, July.31.2003, page 53 of 196