Daily lifeof everyone, manyappliancescan be found inthe application of LED,thecookeron theSMD led and numericl displayis an obvioussign.Youcan well imagine,in yourhome,itcan be found inbasically everyelectricaltraces.Therefore, wecan not fail torecognize that it ispart of our lives, every day youhave to faceit,it makesour life morecolorful and simplicity.