S1D13505 Epson Electronics America, Inc., S1D13505 Datasheet - Page 181

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

Epson Research and Development
Vancouver Design Center
Programming Notes and Examples
Issue Date: 01/02/05
4 bpp gray shade
The 4 bpp gray shade mode uses the first 16 LUT elements. The remaining indices of the
LUT are unused.
8 bpp gray shade
When 8 bpp gray shade mode is selected the gray shade intensity is determined by the green
LUT value. The green portion of the LUT has 16 possible intensities. There is no color
advantage to selecting 8 bpp mode over 4 bpp mode; however, hardware rotate can be only
used in 8 and 16 bpp modes.
15 bpp gray shade
The Look-Up Table is bypassed at this color depth, hence programming the LUT is not
necessary.
As with 8 bpp there are limitations to the colors which can be displayed. In this mode the
four most significant bits of green are used to set the absolute intensity of the image. Four
bits of green resolves to 16 colors. Now however, each pixel requires two bytes.
Table 4-8: Suggested LUT Values for 4 Bpp Gray Shade
Index
0C
0D
0A
0B
0E
0F
FF
00
01
02
03
04
05
06
07
08
09
10
...
Required to match CRT to panel
Red
A0
B0
C0
D0
E0
00
10
20
30
40
50
60
70
80
90
F0
00
00
00
Unused entries
Green
A0
B0
C0
D0
E0
00
10
20
30
40
50
60
70
80
90
F0
00
00
00
Blue
C0
D0
A0
B0
F0
00
10
20
30
40
50
60
70
80
90
00
00
00
E
X23A-G-003-07
S1D13505
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