1.What is LED display screen
The LED display screen is an electronic display screen composed of an LED dot matrix. It can change the screen display content such as text, animation, pictures, and videos by turning on and off red and green lamp beads in real time, and performs component display control through a modular structure. It is mainly divided into display module, control system and power supply system. The display module is a dot matrix of LED lights that form a screen to emit light; the control system controls the on and off conditions within the area to convert the content displayed on the screen; the power system converts the input voltage and current to meet the needs of the display screen.
2. Key technologies of LED display screen
(1) Image acquisition technology: LED image display uses an electronic light-emitting system to display the result of image conversion of digital signals.
(2) Real image color reproduction: Under normal circumstances, the three color combinations of red, green and blue should satisfy the light intensity ratio tending to 3:6:1; red imaging sensitivity is stronger, so the red color in the spatial display must be evenly distributed; Because the light intensities of the three colors are different, the non-linear curves of resolution presented in people’s visual perception are also different. Therefore, it is necessary to use white light of different light intensities to correct the light emitted inside the TV. Color resolution capabilities vary due to personal differences and environmental differences, and must be determined according to certain requirements. Objective indicators for color reproduction.
(3) Brightness control D/T conversion technology: Based on the analysis of visual principles, the bright/off ratio of pixels is the main basis for people to analyze the average brightness. Effectively adjusting this ratio can achieve effective control of pixel brightness. When this principle is applied in LED electronic displays, digital signals can be converted into time signals to achieve effective conversion between D/A.
(4) Data reconstruction and storage technology: At present, the combined pixel method and the bit-flat pixel method are common memory combination methods. Among them, the bit plane method has more obvious advantages, effectively improving the best display effect of the LED screen. After bit plane data circuit reconstruction, RGB data is converted, different pixels in the same weighted bit are organically combined, and adjacent storage structures are used for data storage.
(5) ISP technology system in logic circuit design: With the emergence of programmable technology (ISP), users can repeatedly correct the deficiencies in the design and design their own targets, systems or circuit boards, realizing software-integrated designer applications. Function, at this time, the combination of digital system and system programmable technology brings new application effects. The introduction and use of new technologies can effectively shorten the design time, expand the limited uses of components, simplify on-site maintenance, and facilitate the realization of target equipment functions. When inputting logic in the system software, you can ignore the impact of the selected device and select input components at will, or select virtual components for adaptation after completing the input.
3.The difference between LED display screen and LCD display screen
(1) Brightness: The LED display screen has high brightness, is less affected by ambient light, and can be viewed clearly even in the face of strong light.
(2) Color: The color gamut of LCD screens can generally only reach 70%; while the color gamut of LED displays can reach 110%.
(3) Screen: The large LED screen has a good experience, can achieve seamless splicing, and has good display consistency; while the LCD mirror surface is seriously reflective and will be spliced after a period of use; due to the different degrees of attenuation of the LCD screen, the consistency is different, which will affect the look and feel. .
(4) Maintenance costs: LED display screens have low maintenance costs. Once the LCD screen leaks, the entire screen must be replaced. The LED display screen only needs to replace the module accessories.
(5) Application scope: LED display screens have wider application scenarios. LEDs can be used outdoors and indoors, and the trend of replacing LCDs is becoming more and more obvious.
(6) Lifespan: LED has a long life, and the LED lifespan can reach 100,000 hours; while the LCD is generally 60,000 hours.
(7) Energy consumption: When the LCD is turned on, the entire backlight layer is turned on, which can only be fully turned on or off, and the power consumption is high; each pixel of the LED works independently and can light up certain pixels individually, so the LED Power consumption will be lower.
(8) Environmental protection: LED LCD screen backlight is more environmentally friendly than LCD screen; LED LCD screen backlight is lighter and consumes less fuel during transportation; LED LCD screen is more environmentally friendly than LCD screen when discarded, because LCD screen Contains trace amounts of mercury. And the longer life also reduces waste generation.
