LED display (LED panel): LED is light emitting diode, LED's initials, or LED. It is a semiconductor by controlling the light-emitting diode display to display text, graphics, video, animation, quotes, video, video signals and other information on the display screen.
LED display screen is divided into graphic and video displays, LED matrix by the composition of the block. Graphic display can be synchronized with a computer display Chinese characters and English text and graphics; video screen to control the use of micro-computer, fax, video and Mao to real-time, synchronization, clear message broadcast transmission of information, also revealed that two Dimensional, three-dimensional animation, video, TV, VCD, as well as live shows. LED display shows color images, strong sense of three-dimensional, static, such as painting, moving as the film is widely used in the station, port, airport, shopping malls, hospitals, hotels, banks, the stock market, the construction market, auction houses, industry and enterprise management Other public places.

Its advantages: high brightness, low voltage and power consumption of small, micro and easy to match with the integrated circuit, driving a simple, long life, impact resistance, stable performance.

Colors: red and green LED pixels together as a production called dual-color display screen or color screen; will be red, green and blue LED tubes of the three together as a pixel screen is called tri-color or full-screen Color.

Pixel: the production of indoors LED screen pixel size is generally 2-10 mm, often used to produce several different color of the LED die into one package. Outdoor LED screen pixel size to more than 12-26 mm, each pixel is composed of several kinds of LED components single, common products that pixel tube. Two-color pixel by 3 normally red drum 2 Green, three-color pixel 2 red cylinder with a blue-green component 1. Whether used to produce LED monochrome, dual-color or tri-color screen, would constitute a need to show images of each pixel brightness of the LED must be able to adjust its regulation of the level of fine is the display of gray level. The higher the level of gray, showing images of the more delicate, more color-rich, shows that the control system is also more complex. General 256 gray image, the transition has been very soft colors, and 16 of the gray color image, color transition line is very clear. Therefore, the current color LED screen all requests made of 256 gray.

Show speed: is the LED display screen to update and change the speed, often with frame / s to that.

Communication distance: general LED display is the input signal or other computer equipment, display signal from the input device has a long way, the LED display must support the requirements of long-range input signal and to restore basic to all of the LED display support 10 meters above the input signal.

Interface:
VGA input interface: VGA interface using an asymmetric distribution of the 15pin connection, and its working principle: memory is stored in digital format images (frames) RAMDAC, after a signal in the analog modulation into a high-frequency analog signal, then output to Plasma imaging, so that the VGA input signal (LED display), do not have to like the other video signal as to go through the conversion matrix decoding circuitry. From the front of the video image shows the principle of VGA video transmission is the shortest, the VGA interface has many advantages, such as crosstalk-free synthetic separation circuit without wear and tear.

DVI input interface: DVI interfaces used with the output figures show that the function of the computer graphics connected, the computer showed that the RGB signal. DVI (Digital Visual Interface) figures show that the interface, by September 1998, the Intel Developer Forum on the establishment of the working group's figures show that the (Digital Display Working Group referred to as the DDWG), developed by the digital display interface standard.

DVI digital video standard VGA video signal better digital interface ensures that all digital transmission format, to ensure that the host to monitor the transfer process, the integrity of the data (without the introduction of signal interference), you can get a clearer picture.
Standard video input (RCA) interface: also known as the AV port, usually in pairs of white and yellow audio interface video interface, which is usually used RCA (commonly known as the first Lotus) to connect, when used only to bring the first of the Lotus With the standard AV cable to connect the appropriate interface. AV interfaces to achieve a separation of audio and video transmission, which avoided because the audio / video mixing interference as a result of the decline in image quality, but because of AV transmission interface is still a brightness / chroma (Y / C) mixed the video Signal equipment still needs to show its light / color separation and color imaging can decode, the first mixed and then the separation process is bound to cause the loss of signal color, brightness and color signal will signal a great opportunity for each other Interference in order to influence the final output of image quality. AV also has a certain vitality, but because of its Y / C hybrid that is not insurmountable shortcomings in the pursuit of some of the visual limit the use of the occasion.

S video input: S-Video specific full name in English is called Separate Video, the video in order to achieve better results, people have begun to explore a more efficient and higher-definition quality video transmission, and this is the zenith of the current S-Video (also known as Two-component video interface), Separate Video is the meaning of separate Video signal transmission, which is in the AV interface based on the color and brightness signal C signal Y separated, and then separate channel for transmission, and it appears the development of In the late 1990's usually a standard 4-core (without sound) or the expansion of the 7 core (including audio). S-Video interface with the graphics and video equipment (such as analog video capture / TV card editor and associate professional level monitor TV card / boxes and video-projection TV equipment, etc.) currently has more common, compared with the AV interface because of its No longer carry out Y / C hybrid transmission is therefore no need for separation of Light and decoding, and the use of separate transmission channels to avoid a large extent, the video signal and crosstalk generated image distortion, greatly enhanced the image The resolution, but S-Video will have two color difference signal (Cr Cb) mixed-signal color all the way to C, transmitted and then displayed in the decoding devices for the Cb and Cr processed, so that will bring the number of A certain loss of signal distortion resulting from (a small, but this distortion in the strict broadcast quality video equipment under test can find), and as a result of Cr Cb color led to mixed signals in the bandwidth is also subject to certain restrictions, the S-Video Although the comparison has been excellent, but also a far cry from perfect, S-Video is not the best, but taking into account the current market situation and overall costs and other factors, it is the most common video interface.

Component video input interface: in a number of professional-grade video workstations / professional video editing card or high-end equipment such as DVD players, home appliances see YUV YCbCr Y / BY / BY such as the interface ID tag, although the method of marking and joint Different shape but they are referring to the same color interface port (also known as component video interface). It usually YCbCr and the two logo YPbPr, said the former progressive-scan color output, which said interlaced color outputs. We can see from the above-mentioned relations, we only need to know the value of Y Cr Cb will be able to get the value of G (that is, the fourth equation is not necessary), so the video output and color processing on the neglected green uniform and the only difference Cg Y Cr Cb, which is the basic definition of color output. S-Video as a product of advanced color output will be S-Video signal Chromaticity C transmission broken down into color difference Cr and Cb, thus avoiding a two-way mixed-color decoding and re-separation process, but also to maintain the color The biggest channel bandwidth, only after the anti-matrix decoding circuitry will be able to restore the three primary colors for RGB signals and imaging, which reduces the maximum video source to display video images between the channel and avoid the red tape as a result of the transfer process Brought about by the image distortion, so the color output interface is a way to preserve the video output interface in one of the best.
BNC port: workstations and is commonly used coaxial cable to connect the connectors, the standard of professional video equipment input and output ports. BNC cable connector 5 for receiving red, green, blue, the level of synchronization and vertical synchronization signals. BNC connector is different from ordinary 15-pin D-SUB connector standard special display interface. By the R, G, B and RGB signal line simultaneously, the synchronization field composed of five independent signal connections. Used to connect workstations, and so on the very high frequency scanning system. BNC connector can be isolated from the video input signal so that the signal to reduce interference with each other, and signal bandwidth than the ordinary D-SUB, can best respond to the signal effect.

RS232C serial ports: RS-232C standard (agreement) is the full name of the EIA-RS-232C standard, EIA (Electronic Industry Association) on behalf of the American Electronics Industry Association, RS (ecommeded standard) on behalf of the recommended standard is 232 identification number, C on behalf of the RS232 latest revision (1969), before that, RS232B, RS232A. . It provides cable connections and mechanical, electrical properties, function and signal transmission. There are also common physical standard EIA RS-232-C, EIA RS-422-A, EIA RS-423A, EIA RS-485. Introduced here only EIA RS-232-C (referred to as 232, RS232). Computer input and output interfaces, is the most common serial interface, RS-232C interface standards for the regulation 25 lines, data lines 4, 11, the Line of Control, 3-line from time to time, 7 and back-defined lines, commonly used Only 9, and used in the 25-pin D-sub along with the use of port, the largest of its transmission rate to 20kbps, cable up to 15 meters. RS232C port will be used to signal the computer to control the importation of LED display.