Full color LED displayThe general appearance is that it is composed of many RGB three color light-emitting diodes. Each pixel combination has RGB diodes, and the full-color pictures of different colors are displayed by the lighting of each group of pixel lights. Different full-color LED display quality can be carried out from the following five aspects, such as the quality and parameters of LED beads for full-color LED display.
　　
1. Inefficiency
　　
Because the full-color LED display screen is composed of tens of thousands or even hundreds of thousands of pixel points composed of red, green and blue LED beads, the failure of any color LED beads will affect the overall visual effect of the display screen. Generally speaking, according to industry experience, the failure rate of the LED display screen should not be higher than 1 / 10000 (referring to the failure caused by the LED device itself) 72 hours before shipment.
　　
2. Antistatic ability
　　
LED lamp beads are semiconductor devices, which are sensitive to static electricity and easily lead to electrostatic failure. Therefore, the anti-static ability is very important to the life of LED display screen. Generally speaking, the human body electrostatic mode test failure voltage of LED lamp beads should not be lower than 2000V.
　　
3. Attenuation characteristics
　　
Red, green and blue LED beads have the characteristics of brightness attenuation with the increase of working time. The attenuation speed of LED beads is determined by the quality of LED chips, auxiliary materials and packaging technology. Generally speaking, after 1000 hours and 20 mA normal temperature lighting test, the attenuation of red LED beads should be less than 10%, and the attenuation of blue and green LED beads 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 LED display.
　　
4. Brightness
　　
The brightness of LED beads is an important determinant of the brightness of the full-color LED display screen. The higher the brightness of the LED bulb, the better the stability of the LED bulb. The LED light bead has different angle values. When the chip brightness is set, the smaller the angle, the brighter the LED light bead, but the smaller the angle of view of the LED display screen. Generally, led beads of 100-110 degrees should be selected to ensure sufficient viewing angle of LED display. For LED displays with different point spacing and different viewing distance, a balance should be found in brightness, angle and price.
　　
5. Consistency
　　
The full-color LED display screen is composed of countless pixels composed of red, green and blue LED beads. The consistency of brightness and wavelength of each color LED bead determines the brightness consistency, white balance consistency and chromaticity consistency of the whole LED display screen. Generally speaking, LED display manufacturers require device suppliers to provide led beads with a wavelength range of 5nm and a brightness range of 1:1.3. These indicators can be achieved by device suppliers through light and color separation machines. Voltage consistency is generally not required.
　　
Because the LED light beads are angled, the full-color LED display also has angular directionality, that is, when viewed from different angles, its brightness will increase or decrease. In this way, the angle consistency of red, green and blue LED beads will seriously affect the consistency of white balance at different angles, and directly affect the fidelity of video color of full-color LED display.