SED1354 Datasheet, PDF (157/472 Pages) Epson Company – Color Graphics LCD/CRT Controller

Epson Research and Development
Vancouver Design Center
Page 17
3.3.2 Look-Up Table Organization
• The Look-Up Table (LUT) 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
value ranges between 0 and 0Fh.
• The SED1354 LUT is linear; increasing the LUT number results in a lighter color or gray shade.
For example, a LUT entry of 0Fh into the red Look-Up entry will always result in a bright red
output.
Display Mode
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
Table 3-7: Look-Up Table Configurations
RED
4-Bit Wide Look-Up Table
GREEN
1 bank of 2
4 banks of 4
1 bank of 16
2 banks of 8
BLUE
1 bank of 2
4 banks of 4
1 bank of 16
2 banks of 8
1 bank of 2
4 banks of 4
1 bank of 16
2 banks of 8
1 bank of 2
4 banks of 4
1 bank of 16
4 banks of 4
Effective Grays/Colors on
an Passive Panel
2 gray shades
4 gray shades
16 gray shades
8 gray shades
16 gray shades
16 gray shades
2 colors
4 colors
16 colors
256 colors
4096 colors*
4096 colors*
*
On a TFT 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 (4096) through the frame rate modulator.
Indicates the look-up table is not used for that display mode
Programming Notes and Examples
Issue Date: 98/10/28
SED1354
X19A-G-002-06