hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 132

• 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
n-raster-row Inversion AC Drive
The HD66789, in addition to LCD inversion AC drive by frame, supports n-raster-row inversion AC drive
where alternation occurs by n raster-rows, where n takes a number between 1 to 64. The n-raster-row
inversion AC drive enables to overcome the problems related to display quality.
In determining n (the value set in the NW bit +1), the number of raster-rows by which alternation occurs,
check the display quality on the actual liquid crystal panel. Setting a small number of raster-rows will raise
the AC frequency of the liquid crystal and increase the charge/discharge current on the liquid crystal cells..
Rev.0.12, May 09 2003, page 132 of 156
n-raster row driving
240-raster-row driving
3-raster-row reversed
EOR = 1
Frame AC driving
240-raster-row driving
Note: Make sure that EOR is set to "1" whenever the n-raster-row reverse AC driving to avoid DC bias.
Back porch
1
2
3
n-raster-rows inversion AC drive
4
1 frame
241242
Front porch
256
Back porch
1
2
3
4
1 frame
241 242
Front porch
256
Preliminary
1
2