HD66789 Datasheet, PDF (135/156 Pages) Renesas Technology Corp – 528-channel, One-chip Driver for Amorphous TFT Panels with 262,144-color display RAM, Power Supply Circuit, and Gate Circuit

HD66789
Preliminary
AC Timing
The AC timings of frame inversion AC drive, 3-field interlaced drive, and n-raster-row inversion drive are
illustrated as follows. In case of frame inversion AC drive, alternation occurs at the completion of drawing
one frame, followed by a blank, which lasts for 16H periods. In this case, all outputs from the gate are
Vgoff outputs. In case of interlaced drive, alternation occurs at the completion of drawing one field,
followed by a blank. The total period of the blanks in one frame amounts to 16H period. In case of n-
raster-row, a blank lasting 16H period is inserted after drawing a full screen.
During interlaced drive, make the numbers of back and front porches more than that of field.
Frame inversion AC drive
Back porch
Frame 1
AC timing
Front porch
Blank period
= front porch + back porch
= 16H
3-field interlaced drive
n-raster-row inversion AC drive
AC timing
Field 1
AC timing
Blank period 1
Field 2
AC timing
Blank period 2
Field 3
Blank period 3
Blank period
= Blank period 1
+ Blank period 2
+ Blank period 3
= 8H
(BP=3, FP=5)
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
Back porch
n-raster-rows
n-raster-rows
n-raster-rows
n-raster-rows
n-raster-rows
n-raster-rows
n-raster-rows
n-raster-rows
Front porch
Blank period
= 16H
AC timing
Rev.0.12, May 09 2003, page 135 of 156