The necessity of LED sorting

In the indication application stage of the LED development process, the main function of the LED is to be used as an indicator light or a display light, and generally appears as a single device. With the continuous improvement of LED light efficiency and brightness, its application range is expanding. When LEDs are used as display devices for arrays and displays, if they are not sorted, due to the differences in the photoelectric parameters of multiple LEDs, there must be large dispersion and inhomogeneity in wavelength and brightness. The human eye has a high resolution of the color and brightness of light, and is especially sensitive to color differences and changes. The sensitivity of the human eye to different wavelengths is different. For example, for light with a wavelength of 585nm, When the wavelength change is greater than Inm, the human eye can feel it; and for red light with a wavelength of 650nm, the human eye can perceive the color change only if the wavelength change is greater than 3nm. When multiple LEDs are used as array display and display screen devices, if they are not tested and screened, the unevenness of color and brightness will give people an uncomfortable feeling. Therefore, the parameters of the LED must be tested and screened according to the application requirements, according to the main wavelength, light intensity, luminous flux, color temperature and working voltage, working current and reverse breakdown voltage. LED side testing and sorting is an indispensable and relatively important process in the LED production process. It is the capacity bottleneck of many LED chip and packaging manufacturers at present, and it is also an important part of the cost of LED chip production and packaging.