Epson S1D13705 - Manual (Page 118)

Page 24 Epson Research and Development
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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