hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 135

• Manufacturer Part Number: hd66789
• Description: 528-channel, One-chip Driver For Amorphous Tft Panels With 262,144-color Display Ram, Power Supply Circuit, And Gate Circuit
• Manufacturer: Renesas Electronics Corporation.

HD66789
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.
Rev.0.12, May 09 2003, page 135 of 156
AC timing
Frame inversion AC drive
Blank period
= front porch + back porch
= 16H
Back porch
Front porch
Frame 1
AC timing
AC timing
AC timing
3-field interlaced drive
Blank period
= Blank period 1
+ Blank period 2
+ Blank period 3
= 8H
(BP=3, FP=5)
Blank
Blank period 1
Blank period 3
AC timing
Field 1
Field 2
Field 3
period 2
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
AC timing
n-raster-row inversion AC drive
n-raster-rows
Front porch
Blank period
= 16H
Back porch
n-raster-rows
n-raster-rows
n-raster-rows
n-raster-rows
n-raster-rows
n-raster-rows
n-raster-rows
Preliminary