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1、ThedevelopmentandapplicationofLEDAsthefurtherdevelopmentofdisplaydeviceandtechnology,screendisplaysystemhasbeenwidelyusedinnationaleconomy,LEDdisplayasaearnerfordisplayinginformationisoneofmajormedia.LEDdisplayiscomposedbyusingLEDlatticemoduleorpixelunit・Ascom
2、putertechnologydeveloped,LEDdigitalhasthecharacteristicsofhighreliability,longlife,highcostperformance,lowusingcost,stronglyadaptivecapacitytoenvironmentwhichcanbedirectlydrivenwithoutreducingdrive,therefore,ithasbeenplayingaimportanceroleinthefieldofflatdispl
3、ay・andforalongperiodoftime,thereareconsiderableroomfordevelopment.So,itwidelyusedinthefinancialmarkets,hospitals,stadiums,airports,terminals,stations,highwaysandotherpublicplacesforinformationdisplayandadvertising・FirstLEDSummaryLED(LightEmittingDiode),light-e
4、mittingdiode,isasolidstatesemiconductordevices,whichcanbedirectlyconvertedintoelectricitytolight.LEDistheheartofasemiconductorchip,thechipisattachedtooneendofastent,isthenegativeside,theotherendofthepowerofthecathode,theentirechippackagetobeepoxyresin.Semicond
5、uctorchipiscomposedoftwoparts,partoftheP-typesemiconductor,itinsidethehole-dominated,theothersideistheN-typesemiconductor,hereismainlyelectronic.Butlinkingthetwosemiconductors,amongthemtheformationofaUPNjunction.'1Whenthecurrentthroughthewiresroleinthischip,wi
6、llbepushinge-P,Pzoneintheholewithelectroniccomposite,andthentobeissuedintheformofphotonenergy,andthisistheprincipleofLEDluminescence・Thewavelengthoflightthatisthecoloroflight,isformedbythePNjunctionofthedecisionsofthematerial・SecondLEDdevelopmentThedevelopment
7、ofLEDdisplaycanbedividedintothefollowingphases:firstphase1990to1995,mainlymonochromeand16colorgraphicsscreen.Usedtodisplaytextandsimpleimages,mainlyusedinrailwaystations,financialsecurities,banks,postofficesandotherpublicplaces,aspublicinformationdisplaytools.
8、Thesecondstageisfrom1995to1999,therehavebeen64,256levelgray-scalctwo-colorvideoscreen.Videocontroltechnology,imageprocessing,opticalfibercommunicationtechnologyapplicationswillenha
