LVDS screen cable interface classification and signal transmission principle

1. LVDS LCD screen line interface classification
1. Single 6bit LVDS
In this interface circuit, single-channel transmission is adopted, and each primary color signal uses 6-bit data, a total of 18-bit RGB data, so it is also called 18-bit or 18-bit LVDS interface.
2. Dual 6bit LVDS
In this interface circuit, two-way transmission is adopted, and each primary color signal uses 6-bit data, of which the odd data is 18 bits, the even data is 18 bits, and a total of 36 bits of RGB data, so it is also called 36 bits or 36 bits. LVDS interface.
3. Single 8bit LVDS
In this interface circuit, single-channel transmission is adopted, and each primary color signal adopts 8-bit data, with a total of 24-bit RGB data. Therefore, it is also called 24-bit or 24-bit LVDS interface.

4. Dual 8bit LVDS
In this interface circuit, two-way transmission is adopted, and each primary color signal uses 8-bit data, of which the odd data is 24 bits, the even data is 24 bits, and a total of 48 bits of RGB data, so it is also called 48 bits or 48 bits. LVDS interface.

Two, common LVDS LCD screen line interface definition
D6L (single 6-bit LVDS): 14-pin plug, 20-pin plug, 14-chip plug, 30-chip plug (the number of 100 ohm resistors on the screen display substrate is 4), mainly for notebook LCD screens (12 inches, 13 inches, 14 inches) , 15 inches)
D8L (single 8-bit LVDS): 20-pin plug (5 100 ohms) (15 inches)
S6L (dual 6-bit LVDS): 20-pin plug, 30-pin plug, 30-pin plug (8 100 ohms) (14 inches, 15 inches, 17 inches)
S8L (dual 8-bit LVDS): 30-pin plug, 30-chip plug (10 100 ohm resistors) (17 inches, 18 inches, 19 inches, 20 inches, 21 inches)

Terminal: DF19-20P
Features: ①Pin1-2 power line, Pin3-4 is ground line.
②5 groups of LVDS signal lines.
Interface Definition: 1-2 Power; 3-4: Ground; 5-6 Group 1; 7 Empty; 8-9 Group 2; 10 Ground; 11-12: Group 3; 13 Ground; 14-15 Group 4 Groups; 16 empty; 17-18 Group 5, 19-20 empty. The resistance between each group of signal lines is (about 120 ohms for the digital meter)

Terminal: FIX30P.
Features: ①Pin1-3 power cord.
②8 groups of signal lines.
Interface definition: 1-3 power; 4-7 empty; 8-9: group 1; 10 black wire; 11-12 group 2; 13 black; 14-15 group 3; 16 empty; 17-18 group 4 Groups; 19 empty; 20-21 group 5; 22 empty; 23-24 group 6; 25 empty; 26-27 group 7; 28 empty; 29-30 group 8. The resistance between each group of signal lines is (about 120 ohms for the digital meter)

Terminal: FIX30P.
Features: ①Pin1-3 power cord.
②10 groups of signal lines.
Interface definition: 1-3 power; 4 empty; 5 empty; 6 empty; 7 ground; 8R0-; 9R0+; 10R1-; 11R1+; 12R2-; 13R2+; 14 ground; 15CLK-; 16CLK+; 20RB0-; 21RB0+; 22RB1-; 23RB1+; 24 ground; 25RB2-; 26RB2+; 27CLK2-; 28CLK2+; 29RB3-; 30RB3+
3. Introduction of LVDS LCD screen line sending chip
Typical LVDS sending chips are divided into four-channel, five-channel and ten-channel types, which are briefly introduced below.
1. Four-channel LVDS transmitter chip
Figure 1 shows the internal block diagram of the four-channel LVDS transmitter chip. Contains three data signal (including RGB, data enable DE, line synchronization signal HS, vertical synchronization signal VS) channel and a clock signal transmission channel.

The 4-channel LVDS sending chip is mainly used to drive the 6bit LCD panel. Using the four-channel LVDS sending chip can form a single-channel 6bit LVDS interface circuit and an odd/even dual-channel 6bit LVDS interface circuit.
2. Five-channel LVDS transmitter chip
Figure 2 shows the internal block diagram of the five-channel LVDS transmitter chip (DS90C385). Contains four data signal (including RGB, data enable DE, line synchronization signal HS, vertical synchronization signal VS) channels and a clock signal transmission channel.

The five-channel LVDS sending chip is mainly used to drive the 8bit LCD panel. The five-channel LVDS sending chip is mainly used to form a single-channel 8bit LVDS interface circuit and an odd/even dual-channel 8bit LVDS interface circuit.
3. Ten-channel LVDS transmitter chip
Figure 3 shows the internal block diagram of the ten-channel LVDS transmitter chip (DS90C387). Contains eight data signal (including RGB, data enable DE, line synchronization signal HS, vertical synchronization signal VS) channels and two clock signal transmission channels.

The ten-channel LVDS sending chip is mainly used to drive the 8bit LCD panel. The ten-channel LVDS transmission chip is mainly used to form an odd/even dual-channel 8bitLVDS interface circuit.
In the ten-channel LVDS sending chip, two clock pulse output channels are set, the purpose of this is to be more flexible to adapt to different types of LVDS receiving chips. When the LVDS receiving circuit also uses a ten-channel LVDS receiving chip, it only needs to use the clock signal of one channel; when the LVDS receiving circuit uses two five-channel LVDS receiving chips, the ten-channel LVDS transmitting chip needs to be used for each LVDS receiving chip. The chip provides a separate clock signal.