LVDS output interfaces

Overview of LVDS output interfaces

LCD driver board output digital signal, in addition to including RGB digital signals, including synchronization, field synchronization and pixel clock signals, such as the highest frequency of the clock signal pixels can be more than 28 MHZ, data transfer rate is not high, the TTL interface, short transmission distance, and the electromagnetic anti-interference ability is bad, can cause certain influence to the RGB data, in addition, TTL multi-channel data with the method of ribbon cable to transmit signal, the number of rows of dozens of road, not only the connection is not convenient, and is not suitable for thin, the trend of using an LVDS output interface to transmit data, These problems can be easily solved to realize data transmission with high speed, low noise, long distance and high accuracy.

The LVDS output interface USES a very low voltage swing (about 350mV) to transmit data through differential on two PCB routing lines or a pair of balanced cables, i.e. low-voltage differential signal output. LVDS output interface enables signals to be transmitted at a rate of several hundred Mbit/s on differential PCB lines or balanced cables. Low voltage and low current driving modes enable low noise and low power consumption.

Composition of THE LVDS interface circuit

In LCD, THE LVDS interface circuit consists of two parts: the LVDS output drive circuit on the driver panel side (LVDS transmitter) and the LVDS input interface circuit on the LCD panel side (LVDS receiver). An LVDS transmitter will drive plate 17 l level parallel RGB data of main control chip output signal and the control signal is converted to low voltage serial an LVDS signal, and then through the drive plate and flexible cable (wire) between the LCD panel will signal to the side of the LCD panel, an LVDS receiver to an LVDS receiver serial signal into TTL level parallel signal, an LVDS receivers that are sent to the side of the LCD panel to an LVDS receiver serial signal into TTL level parallel signal, sent to the LCD panel sequential control and drive circuit.