sed1355 ETC-unknow, sed1355 Datasheet - Page 177

• Manufacturer Part Number: sed1355
• Description: Sed1355 Embedded Ramdac Lcd/crt Controller
• Manufacturer: ETC-unknow

Epson Research and Development
Vancouver Design Center
Gray Shade Modes
Programming Notes and Examples
Issue Date: 99/04/27
Note
This discussion of gray shade/monochrome modes only applies to the panel interface. Monochrome
mode is selected when register [01] bit 2 = 0. In this mode the output value to the panel is derived
solely from the green component of the LUT. The CRT image will continue to be formed from all
three (RGB) Look-Up Table components.
1 bpp gray shade
In 1 bpp gray shade mode only the first two entries of the green LUT are used. All other LUT entries
are unused.
2 bpp gray shade
In 2 bpp gray shade mode the first four green elements are used to provide values to the panel. The
remaining indices are unused.
In order to match the colors on a CRT with the colors on a monochrome panel it is important to
ensure that the red and blue components of the Look-Up Table be set to the same intensity as the
green component.
Index
FF
...
Table 4-6: Recommended LUT Values for 1 Bpp Gray Shade
0
1
2
3
4
Table 4-7: Suggested Values for 2 Bpp Gray Shade
Address
= Required to match CRT to panel
= Unused entries
FF
00
01
02
...
Red
A0
F0
00
50
00
00
00
= Required to match CRT to panel
= Unused entries
Red
00
F0
00
00
00
Green
A0
F0
00
50
00
00
00
Green
00
F0
00
00
00
Blue
F0
00
00
00
00
Blue
A0
00
50
F0
00
00
00
X23A-G-003-05
SED1355
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