LED Bin dividing method and application product thereof

Abstract

The invention discloses an LED Bin dividing method and an application product thereof. The LED Bin dividing method and an application product thereof are characterized in that LED Bin dividing parameters included in the method at least comprise brightness or luminous fluxes, voltage and chromaticity coordinates of wafers in LEDs, according to actual distribution conditions of the LED parameters under preset conditions, the parameters are divided into different section ranges, and the parameters in the sections are arranged and combined together to form a final Bin dividing standard. The Bin dividing condition or range of the Bin dividing parameters is reasonably and scientifically defined, scientific definition of optics, electricity and chromaticity is included, products with similar parameters are concentrated in a same Bin, LED products with Bin divided through the method are assembled together, color consistency of end application products can be greatly improved, and color difference or color deviation problems of a same batch of products can be solved.

Description

technical field [0001] The invention belongs to the application field of LED products, and in particular relates to an LED binning method and the application of LED products binned by the method to terminal products. Background technique [0002] Compared with other light-emitting products, LED products have the advantages of excellent energy saving and environmental protection, long life, low cost, etc., so they have been extensively studied and their technological level has developed rapidly. [0003] Before the existing LED products are assembled into final products, in order to eliminate color differences, they must be binned or screened, so that products with similar parameters are divided into one Bin for assembly. The current mainstream binning method is to test and sort the parameters of the LED through a certain interval range under a certain driving current, mainly including the main wavelength, brightness, color temperature, luminous flux, voltage, color coordinat...

AI Technical Summary

Problems solved by technology

[0004] For display LED products, basically all LED wafer or package manufacturers on the market use wavelength, brightness and voltage as binning conditions, such as figure 1 As shown, one reason is that there are differences due to different application fields; another reason is that the research on light chromaticity in the display industry is not thorough enough; in addition, due to the huge demand for display products, existing methods can reduce the proportion of out-of-range and improve Product yield

[0005] In view of the above reasons, from theoretical analysis, there is a certain correspondence between wavelength and chromaticity, such as figure 2 As shown, although the dominant wavelength parameter in the existing display LED binning method has a certain limit on the chromaticity, but because the products with the same dominant wavelength have different color saturation or color purity, there is still a certain color difference in the same Bin product. Deviation problem, which can be compared intuitively in the CIE color coordinate map, such as image 3 As shown, this is also the blurred screen phenomenon that we often see after the LED display is assembled, and it has been difficult to solve, especially for COB display products.

Although some display manufacturers use color coordinate binning for LED products, the range of color coordinates is randomly selected. Therefore, the existing method of binning bins from the source of the product has a certain color shift problem. It is conceivable that the assembled display The color consistency of similar products will also be unsatisfactory

[0006] For white light lighting products, especially white light products composed of multiple colors, although the binning method refers to the phosphor powder or display parameter standards, the product consistency after binning is also poor.

One of the reasons is that phosphor-based white light products use parameters such as color temperature, luminous flux, voltage, and CRI for binning. In terms of colorimetry, color temperature corresponds to color coordinates, but the MacAdam ellipse is used as the interval range, and any range includes The wavelength span may be relatively large, and the color consistency will be poor

If you refer to the display category bin standard, the reason is also the deviation problem due to the difference in color purity

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