LVDS interface introduction

LVDS interface introduction

1. Overview of LVDS interface

LVDS, or Low Voltage Differential Signaling, is a low voltage differential signal technology interface. A digital video signal transmission method developed to overcome the shortcomings of large power consumption and large EMI electromagnetic interference when transmitting broadband high bit rate data in TTL level mode. The LVDS output interface uses a very low voltage swing (about 350mV) to transmit data through differential on two PCB traces or a pair of balanced cables, that is, low-voltage differential signal transmission. Adopting LVDS output interface, can make the signal transmit at the speed of several hundred Mbit/s on the differential PCB line or balanced cable, because of adopting the low voltage and low current driving mode, therefore, realize low noise and low power consumption.

2. Composition of LVDS interface circuit

In the liquid crystal display, the LVDS interface circuit consists of two parts, namely the LVDS output interface circuit on the main board side (LVDS transmitter) and the LVDS input interface circuit on the liquid crystal panel side (LVDS receiver). The LVDS transmitter converts the TTL signal into an LVDS signal, and then transmits the signal to the LVDS decoder IC of the LVDS receiver on the side of the LCD panel through the flexible cable (flat cable) between the driver board and the LCD panel. The LVDS receiver then serializes the The signal is converted into a TTL level parallel signal and sent to the LCD screen timing control and row and column drive circuit. In other words, TFT only recognizes TTL (RGB) signals.