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Colibri Carrier Board Design Guide
Toradex AG l Altsagenstrasse 5 l 6048 Horw l Switzerland l +41 41 500 48 00 l www.toradex.com l info@toradex.com
Page | 17
2.4.2.3 LVDS Transmitter Schematic Example
Since the electromagnetic radiation of the parallel RGB interface is not easy to handle, it is
recommended to attach liquid crystal displays with high resolutions by using an LVDS interface.
LVDS also reduces problems associated with long cables. The Colibri standard does not feature a
dedicated LVDS LCD interface. Nevertheless, a parallel RGB to LVDS transmitter can be placed on
the carrier board to get an LVDS interface.
Since there are different LVDS color mapping available, check with your display vendor how the
RGB signals need to be connected to the transmitter in order to be compatible.
Figure 8: LVDS Transmitter Reference Schematic
18-bit Color Mapping
The color mapping for the 18-bit LVDS interface is standardized and is shown in the following
picture:
Figure 9: 18-bit LVDS Color Mapping
LVDS1_A_CLK+
LVDS1_B_CLK+
LVDS1_A_TX0+/-
LVDS1_B_TX0+/-
LVDS1_A_TX1+/-
LVDS1_B_TX1+/-
LVDS1_A_TX2+/-
LVDS1_B_TX2+/-
Previous Cycle Current Cycle Next Cycle
G0 R5 R4 R3 R2 R1 R0
B1 B0 G5 G4 G3 G2 G1
DE VSYNC HSYNC B5 B4 B3 B2

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