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1、ThedevelopmentandapplicationofLEDAsthefurtherdevelopmentofdisplaydeviceandtechnology,screendisplaysystemhasbeenwidelyusedinnationaleconomy,LEDdisplayasacarrierfordisplayinginformationisoneofmajormedia.LEDdisplayiscomposedbyusingLEDlatticemoduleorpixelunit.Ascomputertechnologydeveloped,LEDdi
2、gitalhasthecharacteristicsofhighreliability,longlife,highcostperformance,lowusingcost,stronglyadaptivecapacitytoenvironmentwhichcanbedirectlydrivenwithoutreducingdrive,therefore,ithasbeenplayingaimportanceroleinthefieldofflatdisplay.andforalongperiodoftime,thereareconsiderableroomfordevelop
3、ment.So,itwidelyusedinthefinancialmarkets,hospitals,stadiums,airports,terminals,stations,highwaysandotherpublicplacesforinformationdisplayandadvertising.FirstLEDSummaryLED(LightEmittingDiode),light-emittingdiode,isasolidstatesemiconductordevices,whichcanbedirectlyconvertedintoelectricitytol
4、ight.LEDistheheartofasemiconductorchip,thechipisattachedtooneendofastent,isthenegativeside,theotherendofthepowerofthecathode,theentirechippackagetobeepoxyresin.Semiconductorchipiscomposedoftwoparts,partoftheP-typesemiconductor,itinsidethehole-dominated,theothersideistheN-typesemiconductor,h
5、ereismainlyelectronic.Butlinkingthetwosemiconductors,amongthemtheformationofa"PNjunction."Whenthecurrentthroughthewiresroleinthischip,willbepushinge-P,Pzoneintheholewithelectroniccomposite,andthentobeissuedintheformofphotonenergy,andthisistheprincipleofLEDluminescence.Thewavelengthoflightth
6、atisthecoloroflight,isformedbythePNjunctionofthedecisionsofthematerial.SecondLEDdevelopmentThedevelopmentofLEDdisplaycanbedividedintothefollowingphases:firstphase1990to1995,mainlymonochromeand16colorgraphicsscreen.Usedto10displaytextandsimpleimages,mainlyusedinrailwaystations,financialsecur
7、ities,banks,postofficesandotherpublicplaces,aspublicinformationdisplaytools.Thesecondstageisfrom1995to1999,therehavebeen64,256levelgray-scaletwo-colorvideoscreen.Videocontroltechnology,imageprocessing,opticalfibercommunicationtechnologyapplicationswillen
