Philips S1D13505 4.2 Look-Up Table Organization

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Vancouver Design Center
Programming Notes and Examples S1D13505
Issue Date: 01/02/05 X23A-G-003-07
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 wil l
result in a bright red output while a LUT entry of 5 would result in a dull red.
Table 4-1: Look-Up Table Configurations
Display Mode 4-Bit Wide Look-Up Table Effective Gray Shade/Colors
on an Passive Panel
RED GREEN BLUE
1 bpp gray 22 gray shades
2 bpp gray 44 gray shades
4 bpp gray 16 16 gray shades
8 bpp gray 16 16 gray shades
15 bpp gray 16 gray shades
16 bpp gray 16 gray shades
1 bpp color 2 2 2 2 colors
2 bpp color 4 4 4 4 colors
4 bpp color 16 16 16 16 colors
8 bpp color 256 256 256 256 colors
15 bpp color 4096 colors*
16 bpp color 4096 colors*
* 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