Interface commonly used for TFT-LCD

Commonly used interfaces of TFT-LCD, TTL (RGB), LVDS, EDP and MIPI, we mainly discuss TTL and LVD below.

TTL (transistor-transistor Logic) is a transistor-transistor Logic in which the TTL level signal is generated by a TTL device. TTL device is a kind of digital integrated circuit. It is made by bipolar process and has the characteristics of high speed, low power consumption and many varieties.

TTL interface is an interface for data transmission in parallel mode. When using this interface, it is not necessary to use special interface circuits at the driver board end and the LCD panel end, but the TTL data signal output by the driver board main control chip is directly transmitted to the LCD panel input interface through the cable.

Overview of THE LVDS interface

LVDS, Low Voltage Differential Signaling, is a Low Differential signal technical interface. A digital video signal transmission method is developed to overcome the disadvantages of high power consumption and EMI electromagnetic interference when transmitting wideband 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 routing lines or a pair of balanced cables, i.e. low-voltage differential signal transmission. 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.

In LCD, THE LVDS interface circuit consists of two parts: the LVDS output interface circuit on the motherboard side (LVDS transmitter) and the LVDS input interface circuit on the LCD panel side (LVDS receiver).