【 Weak current College 】 led display terms detailed 】

Colour: red and green LED together as one pixel of the display name is two-color screen or color screen; the red, green and blue LED tube together as one pixel of the display is called the three color screen or full color screen.

Pixels: making indoor LED screen pixel size is 2-10 mm, often with several kinds of produce different base LED tube packaging. Outdoor LED screen pixel size is 12-26 mm, each pixel is composed of several different monochrome LED, common product called pixel tube. Two color pixels for Red tube by 3 2 green, three-colour pixels used 2 Red 1 blue, 1 green. Whatever LED production monochrome, double or three-colour screen and want to display the image needs constitute a pixel each led luminous intensity must be able to adjust the degree of its fine adjustment is the display's gray-scale level. The higher the levels of gray, the display of the image the more delicate flavour is richer, the corresponding display control system is also more complex. 256-level grayscale general image, color transitions are very soft, and 16-level gray in color images, color transition boundary very obvious. Therefore, the current color LED screen requires 256-level gradation of made.

Display speed: refers to led display updating and converting images of speed, usually frames/sec.

Interface: VGA input connector: VGA interface with asymmetric distribution of 15pin connection, how it works: the memory storage in digital format within the images (frames) signal in the RAMDAC into after analog modem, analog high-frequency signal is then output to VGA plasma imaging so that the signal input (led screen), you do not have to like the other video signal that even after conversion matrix decoding circuit. From the previous video imaging known VGA video transfer process is the shortest, VGA interface has many advantages, such as no crosstalk circuit synthesis and separation loss, etc.

DVI input connector: DVI interface is mainly used with digital display output function of computer graphics, displays the computer's RGB signal. DVI (DigitalVisualInterface) digital display interface, September 1998, at the Intel Developer Forum set up by the digital display working group (DDWG DigitalDisplayWorkingGroup abbreviation), developed by the digital display interface standard.
DVI Digital Terminal than standard VGA Terminal signal better digital interface ensures that all content transmitted using the number format to ensure that the host to monitor transit data integrity (no interference signal into), you can get a sharper image.

Standard video input (RCA) interface: also called AV interface, usually in pairs of white audio interface and the yellow video connector, it usually uses the RCA (commonly known as Lotus head) to connect, you only need to be used with Lotus flower head of standard AV cable and connect the appropriate interface. AV interface enables separation of audio and video transmission, this avoids because audio/video mixing interference caused by the image quality decreases, but because AV interface transmission of remained a luminance/chroma (Y/C) mixing of video signals, still need to show devices for light/color separation and chroma decoding to Imaging, this first mixed then the inevitable separation process will cause the color signal loss, chroma signal and the luminance signal is also a great opportunity to interfere in order to affect the final output image quality. AV also has a certain vitality, but since it itself Y/C mixed this insuperable shortcomings cannot be pursued in a number of occasions of vision limits.

S-video input: the full name in English is called S-Video specific SeparateVideo, in order to achieve better video effects, people began exploring a more efficient excellent sharpness even higher video transmission mode, this is the current flourishing S-Video (also known as two-component video connector), the significance of SeparateVideo is delivered separately from the Video signal, that is in AV interface on the basis of the chrominance signal C and brightness signal Y to detach, and then separately to different channel for transmission, it appears and develops in the late 1990s generally uses a standard 4-core (without sound) or extended 7-core (with sound). Belt S-Video interface graphics and video equipment (for example, analog video capture/editing card TV and associate professional grade monitor TV card/TV box and video projection equipment, etc.) currently have generally, compared with AV interface because it no longer carries Y/C mixed transmission and therefore there is no need for the light color separation and decode, and uses its own independent transmission channel to a large extent, to avoid the video device signal crosstalk and image distortion, greatly improves the sharpness of the image, but still wish to two S-Video road color difference signals (CrCb) along mixed for chrominance signal transmission C, and then in the display device decoding for Cb and Cr are processed, so how many still poses a signal loss and distortion (this distortion is very small but in strict broadcast-quality video equipment under test is still to be found), and because of the mixed results in CrCb chrominance signal bandwidth also has certain restrictions, although already excellent S-Video but far from perfect yet, S-Video although not the best, but given the current market situation and other factors such as the comprehensive cost, it is also the application of the most common video interface.

Video color difference input interface: it is now possible in some professional-grade video workstation/edit card professional-grade video equipment or high-end DVD player, etc, see YUVYCbCrY/B-Y/B-Y etc tag interface identifier, even though its tag method and connector shape is different but all are of the same kind of interface color port (also called the component video interface). It usually uses the YPbPr and YCbCr two identification, which represents the color difference output progressive scan, which indicates an interlaced color difference output. From the gatewayDepartment of ending, we just need to know the value of the YCrCb can get G values (that is, a fourth and so on-is not necessary), video output and color processing on a unified ignore green poor Cg except the YCrCb, this is the basic definition of the color difference output. As a product of advanced S-Video chromatic aberration output re-attach the chroma signal transmitted into color C Cr and Cb, this avoids mixing two chromatic aberration and isolation of the decoding process again, and keep the chroma channels maximum bandwidth, only need to go through the reverse matrix decoding circuit can revert to RGB RGB signal and imaging, which minimize the video source to display the video signal between imaging channels, to avoid the cumbersome process of transferring the image distortion, chromatic aberration output interface is at present a variety of video output connector on the best kind.

BNC port: typically used for workstation and coaxial cable connectors, standard for professional video device input and output ports. BNC cable 5 connector to receive the red, green, blue, horizontal and vertical synchronization signal synchronization. BNC connector is different from the normal 15-pin d-sub standard connectors for special display interface. From R, G, B color signals and the line synchronization, synchronization five separate signal connector. Is used primarily to connect workstations and so on scan frequency demanding systems. BNC connector can be isolated from the video input signal, the signal mutual interference is reduced, and the signal bandwidth greater than ordinary D-SUB, best signal response effect.

RS232C serial port: RS-232C standard (Protocol)-the full name is EIA-RS-232C standards which EIA (ElectronicIndustryAssociation) on behalf of the United States electronic industries Association, RS (ecommededstandard) represents the recommended standard 232 is identification number C represents the latest RS232 last amended (1969), and before that, there are RS232B, RS232A.. It provides connection cables and mechanical, electrical characteristics, signal functions and transfer process. There is also a commonly used physical standard EIA & # 0; RS-232-C, EIA & # 0; RS-422-A, EIA & # 0; RS-423A, EIA & # 0; RS-485. here only EIA & # 0; RS-232-C (232, RS232). Computer input and output interfaces, is the most common serial interface, RS-232C gauge standard interface with 25 lines, 4 data cables, control cables, 11 3 timing line, 7 alternate and undefined line, commonly used only 9 root, commonly used for and 25-pinD-sub port, its maximum transmission rate is the longest 20kbps, cable is 15 meters. RS232C port is used for computer signal input control led display.

Communication distance: General led display of input signal is a computer or other device, display off signal input device has a distance, so called led display must support the distance signal input and restore all the basic support of led display 10 meters above the signal input.

Life: usually in outdoor led display, led display is required to adapt to the changing environment of outdoor, anti-aging and trouble-free operation than other display devices are extremely seriously. Normal fail-safe use time reached more than 5000 hours.

Led display: led display (LEDpanel): LED is lightemittingdiode, led by the initials, or LED. It is a means of control of semiconductor light-emitting diode display mode that is used to display text, graphics, images, animations, market, video, video signals and other information display screen.
Led display is divided into graphic display and video display screen, the LED matrix block. Graphic display screen can display Chinese characters in sync with your computer, the English text and graphics; video display screen with mini-computer control, graphics, images, and Mao to real-time, synchronous, clear information dissemination methods play a variety of information, you can also display two-dimensional and three-dimensional animations, video, TV, VCD programs and live. Led screen display bright colors, three-dimensional sense of strong, dynamic static such as paintings, such as film, widely used in the stations, wharves, airports, shopping malls, hospitals, hotels, banks, securities market, building market, auction houses, industrial enterprises and other public places.

Its advantages: high-brightness, low operating voltage, low power consumption and miniaturisation, easy and simple IC matching, driving, long life, resistant to shocks, and stable performance.