Composition of LVDS interface circuit

Composition of LVDS interface circuit

In the liquid crystal display, the LVDS interface circuit includes two parts, namely, the LVDS output drive circuit (LVDS transmitter) on the driver board side, and the LVDS input interface circuit (LVDS receiver) on the liquid crystal panel side. The LVDS transmitter converts the 17L level parallel RGB data signal and control signal output by the main control chip of the driver board into a low-voltage serial LVDS signal, and then transmits the signal to the liquid crystal through a flexible cable (line) between the driver board and the LCD panel The LVDS receiver on the panel side converts the serial signal into a TTL level parallel signal and sends it to the LVDS receiver on the LCD panel side. The LVDS receiver then converts the serial signal to a TTL level parallel signal. , Sent to the LCD screen timing control and row and column drive circuit. In the process of data transmission, a clock signal must also be involved. The LVDS interface uses differential signal pairs for both data transmission and transmission clock transmission. The so-called signal pair is just each data transmission channel or clock transmission in the LVDS interface circuit. The output of the channel is two signals (positive output and negative output). It should be noted that different LCD displays have different LVDS transmitters on the driver board. Some LVDS transmitters are one or two independent The chip (if DS90C383), some are integrated in the main control chip.

1. Four-channel LVDS transmitter chip

The four-channel LVDS transmitter chip contains three data signal (including RGB, data can DE, line synchronization signal HS, field synchronization signal VS) channels and a clock signal transmission channel. The 4-channel LVDS transmitter chip is mainly used to drive 6bit LCD panels. Using a 4-channel LVDS transmitter chip can form a single 6bit LVDS interface circuit and an odd/even dual 6bit LVDS interface circuit.

2. Five-channel LVDS transmitter chip

The five-channel LVDS transmitting chip contains four data signal (including RGB, data enable DE, horizontal synchronization signal HS, and vertical synchronization signal VS) channels and a clock signal transmission channel. The five-channel LVDS transmitter chip is mainly used to drive the 8bit LCD panel, and the five-channel LVDS transmitter chip is mainly used to form a single 8-bit LVDS interface circuit and an odd/even dual 8-bit LVDS interface circuit.

3. Ten-channel LVDS transmitter chip

Ten-channel LVDS transmitter chip. 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 transmitter chip is mainly used to drive 8bit LCD panels. The ten-channel LVDS transmitter chip is mainly used to form an odd/even dual 8-bit LVDS interface circuit.