HD66781 Datasheet, PDF (109/196 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
Magnification
The HD66781 enables to write resized image data to RAM by simply transmitting original image data to
the window address as usual with the settings of RESH/RESEV[7:0] bits that specify the magnification rate
each for the base and OSD images. The magnification rate is specified each for the base and OSD images.
Also, only a part of RAM area of a base image can be magnified on display in the vertical direction. This
means the HD66781 allows the system simply to transmit an original data as usual even when displaying a
magnified image on a large screen, and therefore enables to reduce the data transmission required for a
large screen display.
The display magnification in the vertical direction should be specified by line.
Base image: The image specified by ESA[8:0] and EEA[8:0] on RAM is magnified on display by
the scale set by the RSEV[1:0] setting.
OSD image: The image specified by OSAx[8:0] and OEAx[8:0] on RAM is magnified on display
in the manner set by the RSEV[7:2] setting.
When magnifying in the horizontal direction, the window-address settings (HSA[0], HEA[0]), RAM
address set (AD[0]), and horizontal incremental direction of the counter (I/D[0]) as follows.
Table 61
Registers
HSA[0]
HEA[0]
AD[0]
Register setting
1’b0
1’b1
1’b0 when I/D[0]=0
1’b1 when I/D[0]=1
The HD66781 performs magnification resizing simply by inserting pixels. The resized image is an
extended original image in both horizontal and vertical direction. Check the resized image before use.
data of an image to transfer
0
1
2
3
0 (0,0) (0,1) (0,2) (0,3)
1 (1,0) (1,1) (1,2) (1,3)
2 (2,0) (2,1) (2,2) (2,3)
3 (3,0) (3,1) (3,2) (3,3)
Horizontal direction
x2 resizing
RSEH=1
RAM data
0
1
2
3
4
5
6
7
0 (0,0) (0,0) (0,1) (0,1) (0,2) (0,2) (0,3) (0,3)
1 (1,0) (1,0) (1,1) (1,1) (1,2) (1,2) (1,3) (1,3)
2 (2,0) (2,0) (2,1) (2,1) (2,2) (2,2) (2,3) (2,3)
3 (3,0) (3,0) (3,1) (3,1) (3,2) (3,2) (3,3) (3,3)
Display on the panel
vertical direction
x2 resizing
RSEV=1
1 (0,0) (0,0) (0,1) (0,1) (0,2) (0,2) (0,3) (0,3)
2 (1,0) (1,0) (1,1) (1,1) (1,2) (1,2) (1,3) (1,3)
3 (1,0) (1,0) (1,1) (1,1) (1,2) (1,2) (1,3) (1,3)
4 (2,0) (2,0) (2,1) (2,1) (2,2) (2,2) (2,3) (2,3)
5 (2,0) (2,0) (2,1) (2,1) (2,2) (2,2) (2,3) (2,3)
6 (3,0) (3,0) (3,1) (3,1) (3,2) (3,2) (3,3) (3,3)
7 (3,0) (3,0) (3,1) (3,1) (3,2) (3,2) (3,3) (3,3)
Resizing: magnification
Rev.0.5, July.31.2003, page 109 of 196