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4: FUNCTION DESCRIPTION
4.1.5
Relationship between Display Memory and Screens
The display memory of the S1D13700 may be used as a virtual screen of greater width than the physical size
of the LCD panel address range (C/R). One layer of the S1D13700 may be considered a window through
which to look at the part of display memory that comprises a virtual screen. This window can be divided into
two blocks that may correspond to independent areas on the virtual screen. Therefore, it is possible to use one
block as a dynamically scrollable data area and the other as a stationary message area. (See Figures 4-7 and 4-
8.)
Screen
SAD1
First screen
block
SAD2
Second screen
block
SAD1
First screen block
SAD3
Third screen block
SAD2
Second screen
block
SAD3
Third screen block
SAD2
Second screen block
SAD1
Third screen block
L1
62
[W/S = 0 ]
SAD1
SAD3
L1
L2
SAD1
SAD3
L1
L2
SAD3
SAD2
L2
L3
Figure 4-7 Relationship between display memory and screens
AP
C/R
C1
C3
SAD2
G2
SAD4
G4
C/R
CG RAM
C/R
C/R
C3
C/R
SAD2
G2
C/R
G3
C/R
G2
C/R
SAD1
G1
EPSON
Screen
[W/S = 1 ]
SAD1
First screen block
SAD3
Third screen block
L1
SAD2
Second screen block
SAD4
Fourth screen block
L2
S1D13700 Technical Manual
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