With the maturity of splicing technology, the interface of LCD splicing screens has become more and more abundant. For example, the commercial splicing screen products of Shenzhen Hualinuo Display Technology Co., Ltd., a leading supplier of commercial displays, not only have abundant ports, but also have complete wiring, providing composite video and color. Different output ports, USB, VGA, DVI, HDMI, AV, etc. meet the real-time processing requirements of 1920 * 1080P for full HD signals; in fact, the output ports of LCD splicing screens are not only used for different wires, but also play different roles. Hualinuo will give you a brief introduction.
DVI output: DVI interface is mainly used to connect a computer graphics card with digital display output function to display the computer's RGB signal. DVI (Digital Visual Interface) digital display interface is a digital display interface standard developed by the Digital Display Working Group (DDWG), which was established on the Intel Developer Forum in September 1998.
VGA output: VGA interface adopts asymmetric distributed 15pin connection. The working principle is to simulate the image (frame) signal stored in the digital format in the video memory as an analog high-frequency signal in the RAMDAC, and then output it to the projector. Imaging allows the VGA signal to be placed at the input (inside the projector) without having to be converted by a matrix decoding circuit like other video signals. From the previous video imaging principle, the VGA video transmission process is the shortest, so the VGA interface has many advantages, such as no crosstalk and no circuit synthesis and separation loss.
Standard video output (RCA): also known as AV interface, usually a pair of white audio interface and yellow video interface. It is usually connected by RCA (usually called lotus head) and only requires the standard of lotus head. The AV cable can be connected to the corresponding interface. The AV interface realizes the separate transmission of audio and video, which avoids the degradation of image quality due to audio/video mixing interference, but it is still the brightness/chroma (Y/C) mixed video transmitted by the AV interface. The signal still needs to be illuminated by the display device for color/color separation and chroma decoding. The process of mixing and then separating will inevitably lead to the loss of color signals, and the chrominance signal and the luminance signal will have a great opportunity for interaction. Therefore, interference will affect the quality of the final output image. AV also has a certain vitality, but due to its insurmountable Y/C hybrid shortcomings, it cannot be used in certain situations where visual limitations are pursued.
