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Page 24 Epson Research and Development
Vancouver Design Center
S1D13705 Programming Notes and Examples
X27A-G-002-03 Issue Date: 02/01/22
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 Red Green Blue
00
00 00 00
01
00 10 00
02
00 20 00
03
00 30 00
04
00 40 00
05
00 50 00
06
00 60 00
07
00 70 00
08
00 80 00
09
00 90 00
0A
00 A0 00
0B
00 B0 00
0C
00 C0 00
0D
00 D0 00
0E
00 E0 00
0F
00 F0 00
10 00 00 00
... 00 00 00
FF 00 00 00
indicates unused entries