Patent ID: 9269857
Filing Date: 2016-02-23
CPC Classification: B23K,H01L

Claim Text:
1. A method of for eliminating a yellow ring phenomenon occurring on a plurality of lightspots of a white light emitting diode (LED) having a blue light chip exciting a plurality of yellow phosphor powders and having a packaging surface thereon, comprising steps of: (a) acquiring a lightspot image of a lightspot outside the packaging surface of the white LED; (b) analyzing the lightspot image to obtain a yellow ring information; (c) looking for a coarse degree required and corresponding to the yellow ring information from a look-up table having a relationship between a plurality of yellow ring information and a plurality of coarse degrees corresponding thereto; (d) launching an atomization process on the packaging surface of white LED according to the coarse degree corresponding to the yellow ring information; and (e) determining if the lightspot is a final one among the plurality of lightspots, and going back to step (a) with respect to a next one among the plurality of lightspots if the lightspot is determined as an intermediate lightspot; and (f) ending up the method if the lightspot is determined as the final lightspot.