1. What is an led display?
LED display screen is an electronic display screen composed of LED dot matrix. The display content forms such as text, animation, pictures and videos are changed in time by turning on and off the traffic light beads, and the module structure is used to control the display of components. It is mainly divided into display module, control system and power system. The display module is LED lamp dot matrix to form screen light; The control system is to control the lighting in the area to realize the conversion of the content displayed on the screen; The power supply system converts the input voltage and current to meet the needs of the display screen.
2. Key technologies of 2.led display screen
(1) Image acquisition technology: LED displays images, and the results of image conversion of digital signals are displayed by electronic light-emitting system.
(2) Real image color reproduction: In general, the combination of red, green and blue colors should meet the requirement that the light intensity ratio tends to 3: 6: 1; Red imaging is more sensitive, so the red color in spatial display must be evenly distributed; Because of the different light intensities of the three colors, people’s visual perception presents different resolution nonlinear curves, so it is necessary to benefit white light with different light intensities and correct the internal light of the TV set; Because of individual differences and environmental differences, the color discrimination ability is different, so it is necessary to reproduce the color according to certain objective indicators.
(3) Brightness control D/T conversion technology: Based on the analysis of visual principle, the brightness/extinction ratio of pixel points is the main basis for people to analyze the average brightness, and effective control of pixel brightness can be achieved by adjusting this ratio effectively. When this principle is applied in LED electronic display screen, digital signal can be converted into time signal, and effective conversion between D/A can be realized.
(4) Data reconstruction and storage technology: At present, combined pixel method and flat pixel method are common memory combination methods. Among them, the advantage of bit plane method is more obvious, which effectively improves the best display effect of LED screen. After the circuit is reconstructed by bit plane data, the RGB data is converted, and different pixels in the same weight position are organically combined, and the adjacent storage structure is used for data storage.
(5) ISP technology system in logic circuit design: With the appearance of programmable technology (ISP), users can repeatedly repair the shortcomings in the design and design their own targets, systems or circuit boards, realizing the designer application function of software integration. At this time, the combination of digital system and system programmable technology brings new application effects. The introduction and use of new technology can effectively shorten the design time, expand the limited use of components, simplify on-site maintenance and facilitate the realization of target equipment functions. When the system software inputs logic, the influence brought by the selected devices can be ignored, and the input components can be selected at will, or the virtual components can be selected for adaptation after the input is completed.
3. The difference between 3.led display and lcd display
(1) Brightness: LED display screen has high brightness, which is less affected by ambient light and can be taken care of in the face of strong light.
(2) Color: Generally, the color gamut of LCD screen can only reach 70%; The color gamut of LED display can reach 110%.
(3) Screen: LED large screen experience is good, seamless splicing can be realized, and the display effect is consistent; However, the LCD mirror is seriously reflective, and after a period of splicing; Due to the different attenuation degree of LCD screen, the consistency is different, which will affect the look and feel.
(4) Maintenance cost: The maintenance cost of LED display screen is low, and the LCD screen must be replaced once it leaks. The LED display screen only needs to replace the module accessories.
(5) Application scope: LED display screen has wider application scenarios, LED can be used outdoors and indoors, and the trend of replacing LCD is becoming more and more obvious.
(6) Life: LED has a long life, and the service life of LED can reach 100,000 hours; The LCD is generally 60 thousand hours.
(7) Energy consumption: When the LCD is turned on, the whole backlight layer is turned on, and it can only be turned on or off, so the power consumption is high; Each pixel of LED works independently, and some pixels can be lit separately, so the power consumption of LED will be lower.
(8) Environmental protection: LED LCD backlight is more environmentally friendly than LCD LCD; LED LCD backlight is light in weight and consumes less fuel during transportation. The LED LCD screen is more environmentally friendly than the LCD screen when it is discarded, because the LCD screen contains trace mercury. And the longer service life also reduces the generation of waste.
