LED full-color screen is a new type of electronic communication media. It has irreplaceable advantages in large size, high brightness and environmental adaptability. It is used in advertising media, stage scenery, building decoration, traffic information, sports venues and other purposes. With the rapid improvement of LED chip technology, packaging technology and LED full-color screen manufacturing technology and further decline in price, full-color LED display screens are crossing the threshold of cost-effective applications, thus gaining huge market applications and demands. The most critical component of full-color LED full-color screens is LED devices for three reasons: first, LEDs are the most used key components in full-color screen displays, and thousands to tens of thousands of LEDs are used per square meter; The main body of the optical display performance of the entire screen directly affects the audience's evaluation of the display screen; third, LEDs account for the largest proportion of the overall cost of the display screen, ranging from 30% to 70%. LED is the most critical device of full-color LED full-color screen, which is equivalent to the CPU of a computer. The choice of LED has determined the quality of more than 50% of the entire display. If you fail to choose a good LED, then no matter how good the other parts of the display are, it will not be able to make up for the defects in the quality of the display. Full-color LED The quality and parameters of LEDs dedicated to full-color screens can be attributed to the following major elements: (1) Brightness, LED brightness is an important determinant of the brightness of the display screen. The higher the brightness of the LED, the greater the margin of the current used, which is more beneficial to saving power consumption and maintaining the stability of the LED. LEDs have different angle values. When the brightness of the chip is fixed, the smaller the angle, the brighter the LED, but the smaller the viewing angle of the display. Generally, 100° LED should be selected to ensure sufficient viewing angle of the display screen. For LED displays with different dot pitches and different viewing distances, a balance point should be found in brightness, angle and price. (2) Antistatic ability. LED is a semiconductor device, which is sensitive to static electricity and can easily lead to static failure. Therefore, the antistatic ability is very important to the life of the display screen. Generally speaking, the failure voltage of LED human body electrostatic mode test should not be lower than 2000V. (3) Failure rate. Since the LED full-color screen is composed of tens of thousands or even hundreds of thousands of pixels composed of red, green, and blue LEDs, the failure of any color LED will affect the overall visual effect of the display. Generally speaking, according to industry experience, the failure rate of LED full-color screens should not be higher than 3/10,000 (referring to the failure caused by the LED device itself) from the beginning of assembly to the aging of 72 hours before shipment. .