HD66781 Datasheet, PDF (177/196 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
Alternating Timing
The following figure illustrates the alternating timing of each alternating drive formula. In case of frame
inversion alternating drive, alternation occurs at the completion of one frame, followed by a blank that lasts
for 16H periods. In case of interlaced drive, alternation occurs at the completion of one field, followed by a
blank. The total period of the blanks in one frame adds up to 16H period. In case of n-raster-row, a blank
lasting 16H period is inserted after all screens are drawn.
During interlaced drive, make the numbers of back, front porches more than the numbers of fields.
Frame inversion Alternating drive 3-field interlaced drive
n-raster-row inversion Alternating drive
Back porch
Frame 1
Alternating
timing
Front porch
Blank period
= front porch + back porch
Alternating
timing
Field 1
Blank period 1
Alternating
timing
Field 2
Blank period 2
Alternating
timing
Field 3
Blank period 3
Alternating timing
Alternating timing
Alternating timing
Alternating timing
Alternating timing
Alternating timing
Alternating timing
Alternating timing
Alternating timing
Alternating timing
Alternating 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
= front porch + back porch
Alternating timing
Rev.0.5, July.31.2003, page 177 of 196