S1D13705 Epson Electronics America, Inc., S1D13705 Datasheet - Page 116

• Manufacturer Part Number: S1D13705
• Description: S1d13705 Embedded Memory Lcd Controller
• Manufacturer: Epson Electronics America, Inc.

Page 24
S1D13705
X27A-G-002-02
4 bpp gray shade
When the S1D13705 is configured for 4 bpp gray shade mode the displayed colors are
selected from the green values of the first sixteen entries of the Look-Up Table. Each of the
sixteen entries can be set to any of the sixteen possible intensity levels.
Each byte in the display buffer contains two adjacent pixels. If a nibble pattern is “0000”
then the green intensity of LUT index 0 is displayed. A nibble value of “0001” results in
the green intensity in LUT index 1 being displayed. The pattern continues to the nibble
pattern of “1111” which results in the sixteenth intensity of Look-Up Table being
displayed.
The following table shows the example values for 4 bit-per-pixel display mode.
Table 4-7: 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
...
Red
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
indicates unused entries
Green
C0
D0
A0
B0
E0
F0
00
10
20
30
40
50
60
70
80
90
00
00
00
Blue
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
Epson Research and Development
Programming Notes and Examples
Vancouver Design Center
Issue Date: 01/02/13