What is an LED display? LED display (LEDpanel): LED is light emitting diode, the abbreviation of light emitting diode, abbreviated as LED. It is a display method by controlling semiconductor light-emitting diodes, and its general appearance is composed of a lot of small lights that are usually red, and characters are displayed by turning on and off the lights. A display screen used to display various information such as text, graphics, images, animation, market quotations, videos, and video signals. Types and applications of LED displays LED displays are divided into graphic displays and video displays, both of which are composed of LED matrix blocks. The graphic display screen can display Chinese characters, English text and graphics synchronously with the computer; the video display screen is controlled by a microcomputer, and the graphics, text and images are both displayed. It can display various information in real-time, synchronized and clear information dissemination mode, and can also display two One-dimensional, three-dimensional animation, video, TV, VCD programs and live broadcasts. The LED display screen has bright colors and strong three-dimensional effect. It is as quiet as an oil painting and as moving as a movie. It is widely used in finance, taxation, industry and commerce, post and telecommunications, sports, advertising, factories and mining enterprises, transportation, education systems, stations, docks, etc. The display advantages of LED display The LED display can display changing numbers, text, and graphics; it can be used not only in indoor environments but also in outdoor environments. It has the incomparable advantages of projectors, TV walls, and LCD screen
s. The reason why LED is widely valued and developed rapidly is inseparable from its own advantages. These advantages can be summed up as follows: the development prospects of LEDs with high brightness, low working voltage and power consumption are extremely broad. Currently, they are moving towards higher brightness, higher weather resistance, higher luminous density, higher luminous uniformity, and reliability. Development in the direction of sex and panchromatic. The classification of LED display screens: 1, according to the color base color classification Single color display: single color (red or green). Dual-primary color display: red and green dual-primary colors, 256-level grayscale, 65536 colors can be displayed. Full-color display: red, green, and blue three primary colors, 256-level gray-scale full-color display can display more than 16 million colors. 2. Classification of LED digital display screens by display device: The display device is a 7-segment digital tube, which is suitable for making clock screens, interest rate screens, etc., and digital display screens. LED dot matrix graphic display: The display device is a dot matrix display module composed of many evenly arranged light-emitting diodes, suitable for playing text and image information. LED video display screen: The display device is composed of many light-emitting diodes, which can display various video files such as videos and animations. 3. Classification of indoor display screens according to use occasions: the luminous point is small, generally Φ3mm--Φ8mm, and the display area is generally a few to ten square meters. Outdoor display screen: The area is generally tens of square meters to hundreds of square meters, with high brightness, can work in the sun, and has the functions of windproof, rainproof and waterproof. 4. According to the diameter of the luminous point, indoor screens are classified: Φ3mm, Φ3.75mm, Φ5mm, outdoor screens: Φ10mm, Φ12mm, Φ16mm, Φ19mm, Φ20mm, Φ21mm, Φ22mm, Φ26mm 5, according to the display method classification static, horizontal scrolling, vertical scrolling and flip Page display etc. A single module controls and drives 12 (up to 24) 8X8 dot matrix, a total of 16X48 dot matrix (or 32X48 dot matrix), is a single MAX7219 (or PS7219, HD7279, ZLG7289 and 8279 and other similar LED display driver modules) 12 times (or 24 times)! Can use 'cascade' method to form any large dot matrix display screen. The display effect is good, the power consumption is small, and the cost is lower than that of the MAX7219 circuit. Indoor LED screen scheme introduces the earliest design scheme of dot matrix module scheme, developed from indoor pseudo-color dot matrix screen. Advantages: The cost of raw materials is the most advantageous, and the production and processing technology is simple, and the quality is stable. Disadvantages: poor color consistency, serious mosaic phenomenon, and poor display effect. In order to solve the color problem of the dot matrix screen, the single-lamp solution draws lessons from outdoor display technology, and at the same time transplants outdoor pixel multiplexing technology (also called pixel sharing technology, virtual pixel technology) to indoor display screens. Advantage: The color consistency is better than that of the dot matrix module. Disadvantages: poor color mixing effect, low viewing angle, and chromatic aberration when viewed horizontally. The processing is more complicated, and the antistatic requirements are high. It is difficult to achieve the actual pixel resolution above 10,000 dots. The patch scheme uses a patch luminous tube as the display element. Advantages: The color consistency, viewing angle and other important display indicators are the best among the existing solutions, especially the color mixing effect of the three-in-one surface mount is very good. Disadvantages: the processing technology is troublesome and the cost is too high. The sub-surface mount solution is actually an improvement of the single lamp solution, and it is still being improved. Advantages: There is little difference in display color consistency, viewing angle and other primary indicators and labeling schemes, but the cost is lower, the display effect is very good, and the resolution can theoretically be more than 17200. Disadvantages: The processing is still more complicated, and the antistatic requirements are high.
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