HD66773R Datasheet, PDF (101/133 Pages) Renesas Technology Corp – 262,144-color, 132 x 176-dot Graphics Controller Driver for TFT LCD panels

HD66773R
n-raster-row Inversion AC Drive
The HD66773R, 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 allows overcoming 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.
1 frame
1 frame
12 3 4
Blank period
175 176
184 1 2 3 4
Blank period
175 176
184 1 2
Frame A/C
waveform drive
176-raster-row drive
n-raster-row AC
waveform drive
176-raster-row drive
3-raster-row inversion
EOR - "1"
Make sure that EOR = "1" in n-raster-row drive to prevent the direct bias on liquid crystal.
Rev.1.10, Jun.21.2003, page 101 of 133