S1D13505 Epson Electronics America, Inc., S1D13505 Datasheet - Page 180

• Manufacturer Part Number: S1D13505
• Description: LCD Controller
• Manufacturer: Epson Electronics America, Inc.

Page 26
Gray Shade Modes
S1D13505
X23A-G-003-07
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 im-
portant to ensure that the red and blue components of the Look-Up Table be set to the
same intensity as the green component.
Table 4-6: Recommended LUT Values for 1 Bpp Gray Shade
Table 4-7: Suggested Values for 2 Bpp Gray Shade
Index
FF
...
0
1
2
3
4
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
00
50
A0
F0
00
00
00
Green
F0
00
00
00
00
Blue
F0
00
00
00
00
Blue
A0
00
50
F0
00
00
00
Epson Research and Development
Programming Notes and Examples
Vancouver Design Center
Issue Date: 01/02/05