Like TTL output interfaces, LVDS output interfaces are classified into the following four types: Some LVDS transmitters are one or two independent chips (such as DS90C383), while some are integrated in the main control chip (such as GM5221 has an LVDS transmitter inside).
#8bit single chanel lvds screen spec driver
It should be noted that LVDS transmitters on the driver board of different LCDS are not the same. The so-called signal pair, refers to the LVDS interface circuit, each data transmission channel or clock transmission channel output are two signals (positive output and negative output). LVDS interface transmits both data and clock in the form of differential signal pair.
In the process of data transmission, clock signal must also be involved. Figure 1 shows the schematic diagram of LVDS interface circuit.
#8bit single chanel lvds screen spec serial
The LVDS receiver then converts the serial signal into TTL level parallel signal, which is sent to the LCD screen timing control and row and column drive circuit. LVDS transmitter converts TTL level parallel RGB data signals and control signals output by the main control chip of the driver board into low-voltage serial LVDS signals, and then transmits the signals to the LVDS receiver on the side of the LCD panel through the flexible cable (cable) between the driver board and the LCD panel. In the LIQUID crystal display, THE LVDS interface circuit includes two parts, namely the LVDS output interface circuit (LVDS transmitter) on the side of the drive board and the LVDS input interface circuit (LVDS receiver) on the side of the LCD panel. LVDS output interface is widely used in 17 "and above LCD display. Because of the low voltage and low current driving mode, low noise and low power consumption are realized. LVDS output interface can make the signal transfer rate of several hundred Mbit/s on the differential PCB line or balanced cable. low voltage differential signal transmission.
LVDS output interface utilizes very low voltage swing (about 350mV) to transmit data through differential between two PCB routes or a pair of balanced cables, i.e. It is a kind of digital video signal transmission method developed by NS company in order to overcome the disadvantages of high power consumption and EMI electromagnetic interference when TTL level is used to transmit broadband data with high bit rate.
So, what is the LVDS output interface? LVDS, or Low Voltage Differential Signaling, is a Low Voltage Differential signal technology interface. Using LVDS output interface to transmit data, these problems can be solved, and the data can be transmitted with high rate, low noise, long distance and high accuracy. In addition, THE TTL multi-channel data signal is transmitted by the way of the line, the number of the whole line up to dozens of roads, not only inconvenient connection, but also not suitable for the trend of ultra-thin. With THE TTL interface, the data transmission rate is not high, the transmission distance is short, and the anti-EMI capability is poor, which will affect the RGB data to some extent. LCD driver board output of digital signals, in addition to including RGB data signal, also includes line synchronization, field synchronization, pixel clock and other signals, the highest frequency of the pixel clock signal can exceed 28MHz.
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