Full color LED displayThe display effect of LED is directly related to users and audiences. In order to obtain a perfect use experience, we need to control and improve the quality of LED display. So, how to control and improve the quality of LED full-color display? What are the important indicators that reflect the quality of special LED for full-color LED display? The manufacturer will answer the following questions for you:
　　
As the most critical component of full-color LED display, LED devices have three reasons:
　　
1. LED is the most used key device in the full-color screen machine, and thousands to tens of thousands of LEDs will be used per square meter;
　　
2. LED is the main body that determines the performance of the whole screen optical display, which directly affects the audience's evaluation of the display screen;
　　
3. LEDs account for the largest proportion of the overall cost of the display screen, ranging from 30% to 70%. The selection of LED determines the quality of more than 50% of the whole display screen. If the LED is not selected well, no matter how good other parts of the display screen are, they cannot make up for the quality defects of the display screen.
　　
Important indicators reflecting the quality of special LED for full-color LED display screen mainly include:
　　
1. Inefficiency
　　
Because the full-color LED display screen is composed of tens of thousands or even hundreds of thousands of elements composed of red, green and blue LEDs, the failure of any color LED will affect the overall visual effect of the display screen. Generally speaking, according to industry experience, the failure rate of full-color LED display screens should not be higher than 3 / 10000 (referring to the failure caused by the LED device itself) 72 hours before shipment.
　　
2. Antistatic ability
　　
LED is a semiconductor device, which is sensitive to static electricity and easily leads to static electricity failure. Therefore, the anti-static ability is very important to the life of the display screen. Generally speaking, the human body electrostatic mode test failure voltage of LED should not be lower than 2000V.
　　
3. Consistency
　　
The full-color LED display screen is composed of countless red, green and blue LED elements. The brightness and wavelength consistency of each color LED determines the brightness consistency, white balance consistency and chromaticity consistency of the whole display screen. Generally speaking, the display manufacturer requires the device supplier to provide LEDs with a wavelength range of 5nm and a brightness range of 1:1.3. These indicators can be achieved by the device supplier through the light and color separation machine. Voltage consistency is generally not required.
　　
4. Brightness
　　
LED brightness is an important determinant of display brightness. The higher the brightness of the LED, the greater the margin of the current used, which is good for saving power consumption and maintaining the stability of the LED. LEDs have different angle values. When the brightness of the chip is set, the smaller the angle, the brighter the LED, but the smaller the viewing angle of the display screen. Generally, 100 degree LED should be selected to ensure sufficient viewing angle of the display screen. For displays with different point spacing and different viewing distances, a balance should be found in brightness, angle and price.
　　
5. Attenuation characteristics
　　
Red, green and blue LEDs all have the characteristics of brightness attenuation with the increase of working time. The attenuation speed of LED is determined by the quality of LED chip, auxiliary materials and packaging technology. Generally speaking, after 1000 hours and 20 mA ambient temperature lighting test, the attenuation of red LED should be less than 10%, and the attenuation of blue and green LED should be less than 15%; The consistency of red, green and blue attenuation has a great impact on the white balance of full-color LED display in the future, and then affects the display fidelity of the display.