HD66781 Datasheet, PDF (175/196 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
Interlaced Drive
The HD66781 supports interlaced drive, which divides one frame into n fields and then drives to prevent
flickers.
To determine the number of fields (n: value set by the FLD bits), check the display quality on the actual
liquid crystal panel. The following table shows the gate selection for each number of fields, 1 to 3. The
figure illustrates the output waveforms of the 3-field interlaced drive.
Table 75
GA=0, SM=0, GS0=0, GS1=0
GA=1, SM=0, GS0=0, GS1=1
FLD1-0
2’h1
2’h3
FLD1-0
2’h1
2’h3
Field -
1
2
3
Field -
1
2
3
Gate
Gate
G1
OO
G328
OO
G2
O
O
G327
O
O
G3
O
O
G326
O
O
G4
OO
G325
OO
G5
O
O
G324
O
O
G6
O
O
G323
O
O
G7
OO
G322
OO
G8
O
O
G321
O
O
G9
O
O
G320
O
O
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
G317
O
O
G12
O
O
G318
O
O
G11
O
O
G319
OO
G10
OO
G320
O
O
G9
O
O
Note 1) Interlaced drive is not available in RGB interface mode.
Note 2) Middle porch must be set to BP = 3 (3 lines) for interlaced drive.
Note 3) OSD (α blending), scrolling, and resizing functions are not available with interlaced drive.
Rev.0.5, July.31.2003, page 175 of 196