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LED display screen purchase entry: detailed terminology
LED display:
 
    LED display (LED panEL): LED is light emitting diode, the abbreviation of LED, referred to as LED. It is a display screen for displaying various information such as text, graphics, images, animations, quotes, videos, video signals, etc. by controlling the display mode of the semiconductor light-emitting diodes.
 
    The LED display is divided into a graphic display and a video display, both of which are composed of LED matrix blocks. The graphic display can display Chinese characters, English text and graphics synchronously with the computer; the video display screen is controlled by a microcomputer, and the pictures and images are displayed together, and various information can be played in real-time, synchronous and clear information dissemination mode, and the second display can also be displayed. Dimensions, 3D animation, video, TV, VCD shows and live live. The LED display screen has bright colors, strong stereoscopic effect, and is as static as oil painting. It is widely used in stations, terminals, airports, shopping malls, hospitals, hotels, banks, securities markets, construction markets, auction houses, industrial enterprises and Other public places.
    Its advantages: high brightness, low operating voltage, low power consumption, miniaturization, easy to match with integrated circuits, simple drive, long life, impact resistance, and stable performance.
 
color
 
    A display screen in which red and green LEDs are put together as one pixel is called a two-color screen or a color screen; a display screen in which three LED tubes of red, green, and blue are put together as one pixel is called a three-color screen or a full-color screen.
 
Pixel
 
    The pixel size of the indoor LED screen is generally 2-10 mm, and it is often used to package several LED dies that can produce different primary colors. The outdoor LED screen has a pixel size of 12-26 mm, and each pixel is composed of a plurality of various single-color LEDs. The common finished product is called a pixel tube. The two-color pixel tube is generally composed of 3 red 2 green, and the three-color pixel tube is composed of 2 red 1 green 1 blue. Regardless of whether a single-color, two-color or three-color screen is made with LEDs, the brightness of each LED that needs to constitute a pixel must be adjustable. The fineness of the adjustment is the gray level of the display. The higher the gray level, the finer the displayed image and the richer the color, and the more complex the corresponding display control system. Generally, the image of 256-level gray scale has a very soft color transition, while the color image of 16-level gray scale has a clear color transition boundary. Therefore, color LED screens are currently required to be 256-level grayscale.
 
Display speed
 
    Refers to the speed at which the fine pitch LED display updates and converts the picture, usually expressed in frames per second.
 
Communication distance
 
    Generally, the signal input of the LED display is a microcomputer or other device, and the display screen is separated from the signal input device. Therefore, the LED display screen must support the input and restore of the remote signal. Basically all the LED displays support more than 10 meters. Signal input.
 
life
 
    Usually the LED display is used outdoors, so the LED display can adapt to the outdoor variable environment, and it is better than other display devices in anti-aging and trouble-free operation. Generally, the normal and trouble-free use time can reach more than 5000 hours.
 
interface
 
    The interface is an important parameter indicator for all display devices. The LED display is also a display device. Here is a brief explanation of the commonly used interfaces:
 
    VGA input interface: VGA interface adopts asymmetrically distributed 15pin connection mode. Its working principle is to simulate the image (frame) signal stored in digital format in analog memory into analog high frequency signal in RAMDAC, and then output to plasma. Imaging, so that the VGA signal is at the input (in the LED display), it does not have to be converted by the matrix decoding circuit like other video signals. From the previous video imaging principle, the video transmission process of VGA is the shortest, so the VGA interface has many advantages, such as no crosstalk and no circuit synthesis separation loss.
 
    DVI input interface: The DVI interface is mainly used to connect with a computer graphics card with digital display output function to display the RGB signal of the computer. The DVI (Digital Visual Interface) digital display interface is a digital display interface standard developed by the Digital Display Working Group (DDWG), which was established at the Intel Developer Forum in September 1998.
    The DVI digital terminal is better than the standard VGA terminal signal. The digital interface ensures that all content is transmitted in digital format, ensuring the integrity of the data during the transmission from the host to the monitor (no interference signal is introduced), and a clearer image can be obtained.
 
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