Analysis of 10 technical parameters of outdoor LED display

　　1. Clarity: Determine the required screen area and clarity based on the optimal viewing distance. The optimal distance is 5-50 meters. Use the most advanced 16-bit data interface to further improve the clarity of the picture.

　　2. Brightness: The screen brightness is designed to be above 2500cd/m2, which not only ensures the realistic colors and clear images of the indoor full-color LED display when it is in normal use, but also ensures that the LED display has sufficient brightness and the video image is bright and clear when the lamp attenuation exceeds 30%. Refresh rate: Category 5e twisted pair shielded wire is used between the processor and the screen, and a high-performance control IC is configured. The high refresh rate of the screen can be designed to be ≧1000HZ to ensure that there are no water ripples and flickering when the video is played. The full digital loss is low and anti-electromagnetic interference. Power supply and signal transmission method: Because of the importance of the full-color LED display, the power supply and signal transmission must be specially processed technically, and high-quality military-grade connectors are used. Further control the faults caused by various pulling forces at the connector.

　　3. Control method: We select a self-designed control system and conduct 240-hour non-stop power-on aging screening to select a highly reliable control system. In addition, dual redundant hot backup is used in the control method. Once a problem occurs, another signal line will be connected immediately to continue normal operation and smooth connection.

　　4. Raw materials: All raw materials of LED display screens are selected from famous brands and high-quality products, and the most important LED lamps are high-quality LED lamps;

　　5. Three-level product aging process: First, the modules produced by the automated assembly line are powered on for 24 hours for aging, then the single cabinet is powered on for 48 hours for aging, and finally the finished display screen is powered on for 72 hours to simulate on-site assembly. Only after passing the test can it be transported to the site for assembly.

　　6. Product quality control: All products are manufactured in strict accordance with ISO9001-2000 quality certification system documents. (See quality certification certificate), and will be strictly tested according to the waterproof level IP65 to achieve a completely waterproof effect. LED display installation and debugging: The LED display is installed and debugged strictly according to the design plan, and the installation level reaches C level or above (the highest level of LED display installation).

　　7. Leading system software (prepared for screen application): The operating system uses Windows XP and supports the latest Windows products provided by Microsoft. All application software uses Windows as the operating platform and has a user-friendly interface. The playback software has rich clock functions, which can display the current date and time. The display clock synchronized with the computer time can be an analog clock or a digital clock. The software uses advanced thread technology, and can play text, animation, clock, photo, audio, etc. in multiple threads when playing the software.

　　8. Perfect system function design (prepared for screen application): This system can meet the requirements of gatherings, performances, TV broadcasts and advertising broadcasts. The LED display screen system of this project has multimedia, multi-channel, and can transmit high-speed communication data and video interfaces in real time. It can easily introduce various forms of information sources into the computer network system and realize unified control of various audio and video inputs. The detailed functions are as follows:

　　9. The video playback function can display true color dynamic video images; it can broadcast closed-circuit television and satellite TV programs with high fidelity; it has a variety of video signal input and output interfaces: composite video, Y/C video (S_Video), YpbPr, VGA (RGBHV), DVI, HDMI, SDI (HDSDI); it can play video programs such as VCRs and video disc players (VCD, DVD, LD) with high fidelity; it has the function of superimposing text, animation and static pictures on the video screen; it can realize real-time editing and playback functions such as panorama, close-up, slow motion and special effects through editing equipment. Brightness, contrast, saturation and chroma can be adjusted by software, and the adjustment range is 256 levels; it has image freezing function; it has three display modes: video superposition (VGA+Video), image (Video), and VGA; it has horizontal/vertical position compensation function; it has display synchronization function.

　　10. Computer graphic information playback function can display various computer information, text, graphics, pictures and two-dimensional and three-dimensional animations, etc.; it has rich playback methods, displaying scrolling information, notifications, slogans, etc., and has a large storage capacity for data information. The display screen can open multiple windows to display calendars, clocks, and insert single-line flowing text. There are a variety of Chinese fonts and fonts to choose from, and you can also input many foreign languages ​​such as English, Spanish, French, German, Greek, Japanese, Latin and Russian. The broadcast system has multimedia software, which can flexibly input and broadcast a variety of information. There are more than 20 broadcast methods, including left and right scrolling, up and down scrolling, left and right push, up and down push, diagonal push, diffusion, fan-shaped, rotation, zoom, etc. It can display network data information through network connection. It is equipped with a network interface, which can be connected to the computer to share network resources, and has a standard audio signal output interface to achieve audio and video synchronization.