Look-Up Table Organization - Epson S1D13505F00A Technical Manual

4.2 Look-Up Table Organization

• The Look-Up Table treats the value of a pixel as an index into an array of colors or gray shades.
For example, a pixel value of zero would point to the first LUT entry; a pixel value of 7 would
point to the eighth LUT entry.
• The value inside each LUT entry represents the intensity of the given color or gray shade. This
intensity can range in value between 0 and 0Fh.
• The S1D13505 Look-Up Table is linear; increasing the LUT entry number results in a lighter
color or gray shade. For example, a LUT entry of 0Fh into the red LUT entry will result in a bright
red output while a LUT entry of 5 would result in a dull red.
Display Mode
RED
1 bpp gray
2 bpp gray
4 bpp gray
8 bpp gray
15 bpp gray
16 bpp gray
1 bpp color
2 bpp color
4 bpp color
8 bpp color
15 bpp color
16 bpp color
* On an active matrix panel the effective colors are determined by the interface width. (i.e. 9-bit=512, 12-bit=4096,
18-bit=64K colors) Passive panels are limited to 12-bits through the Frame Rate Modulator.
Indicates the Look-Up Table is not used for that display mode.
Color Modes
In color display modes, depending on the color depth, 2 through 256 index entries are used. The
selection of which entries are used is automatic.
1 bpp Color
When the S1D13505 is configured for 1 bpp color mode, the LUT is limited to the first two entries.
The two LUT entries can be any two RGB values but are typically set to black-and-white.
Each byte in the display buffer contains 8 bits, each pertaining to adjacent pixels. A bit value of '0'
results in the LUT 0 index value being displayed. A bit value of '1' results in the LUT 1 index value
being displayed.
The following table shows the recommended values for obtaining a black-and-white mode while in
1 bpp on a color panel.
Table 4-2 Recommended LUT Values for 1 Bpp Color Mode
S1D13505 PROGRAMMING NOTES
AND EXAMPLES (X23A-G-003-05)
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Table 4-1 Look-Up Table Configurations
4-Bit Wide Look-Up Table
GREEN BLUE
2
4
16
16
2 2 2
4 4 4
16 16 16
256 256 256
Index Red Green
00 00 00
01 F0 F0
02 00 00
... 00 00
FF 00 00
Indicates unused entries in the LUT.
EPSON
4: LOOK-UP TABLE (LUT)
Effective Gray Shade/Colors
on an Passive Panel
2 gray shades
4 gray shades
16 gray shades
16 gray shades
16 gray shades
16 gray shades
2 colors
4 colors
16 colors
256 colors
4096 colors*
4096 colors*
Blue
00
F0
00
00
00
2-9