On-Screen
Display
Mascot V OSD display support
s
256 different fonts at size of 12x18, 256 fonts contain 128 fixed fonts that
are
stored
in internal ROM, other 128 programmable fonts
are
stored in internal SRAM. OSD also support
s
Overlay
port
interface and color look-up table with 4 color indices from external OSD.
Diagram listed below is the concept of how OSD retrieve and display OSD Font. See FIG3-6.
FIG3-6 On-Screen Display
When
an
OSD key
ha
s been pressed, firmware will detect the change and perform the procedure
.
O
nce firmware
starts
“drawing” OSD, it will program the OSD code and attribute to the OSD SRAM. Chip will look-up the OSD
code
then retrieve the character font data that correspond
s
to the code and then display the character on LCD panel.
There are 320 memory spaces from 0 to 319 in SRAM. It is sequentially mapped to the OSD frame started fr
o
m
the upper-right corner and goes horizontally to the upper-left corner
,
and then move to
the
2
nd
row
and
etc.
e
nd
ing
at
left-bottom corner. OSD frame are divided by 0
Д
9 in row, total is 32x10=320 characters.
Diagram listed below is the concept of how 24bit RGB OSD character
is
composed, see FIG3-7 OSD Display
Flow Chart.
Each OSD character font data that
is
read out from ROM table will use the 4-bit
foreground and 4-bit
background color to determine its color. Use these 4-bit color ind
ic
es to
look-up the palette and select related
1
5bit RGB foreground and background color.
A
dd
a
3bit
"
0
"
to each R, G, and B channel then generate 24
-b
it
RGB color for the OSD character.
ViewSonic Corporation
17
Confidential
-
-
Do
Not Copy
VG1
5
0m
/mb
Содержание VG150m-1
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