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1、ThedevelopmentandapplicationofLEDAsthefurtherdevelopmentofdisplaydeviceandtechnology,screendisplaysystemhasbeenwidelyusedinnationaleconomy,LEDdisplayasacarrierfordisplayinginformationisoneofmajormedia.LEDdisplayiscomposedbyusingLEDlatticemoduleorpixel
2、unit.Ascomputertechnologydeveloped,LEDdigitalhasthecharacteristicsofhighreliability,longlife,highcostperformance,lowusingcost,stronglyadaptivecapacitytoenvironmentwhichcanbedirectlydrivenwithoutreducingdrive,therefore,ithasbeenplayingaimportancerolein
3、thefieldofflatdisplay.andforalongperiodoftime,thereareconsiderableroomfordevelopment.So,itwidelyusedinthefinancialmarkets,hospitals,stadiums,airports,terminals,stations,highwaysandotherpublicplacesforinformationdisplayandadvertising.FirstLEDSummaryLED
4、(LightEmittingDiode),light-emittingdiode,isasolidstatesemiconductordevices,whichcanbedirectlyconvertedintoelectricitytolight.LEDistheheartofasemiconductorchip,thechipisattachedtooneendofastent,isthenegativeside,theotherendofthepowerofthecathode,theent
5、irechippackagetobeepoxyresin.Semiconductorchipiscomposedoftwoparts,partoftheP-typesemiconductor,itinsidethehole-dominated,theothersideistheN-typesemiconductor,hereismainlyelectronic.Butlinkingthetwosemiconductors,amongthemtheformationofa"PNjunction."W
6、henthecurrentthroughthewiresroleinthischip,willbepushinge-P,Pzoneintheholewithelectroniccomposite,andthentobeissuedintheformofphotonenergy,andthisistheprincipleofLEDluminescence.Thewavelengthoflightthatisthecoloroflight,isformedbythePNjunctionofthedec
7、isionsofthematerial.SecondLEDdevelopmentThedevelopmentofLEDdisplaycanbedividedintothefollowingphases:firstphase1990to1995,mainlymonochromeand16colorgraphicsscreen.Usedtodisplaytextandsimpleimages,mainlyusedinrailwaystations,financialsecurities,banks,p
8、ostofficesandotherpublicplaces,aspublicinformationdisplaytools.Thesecondstageisfrom1995to1999,therehavebeen64,256levelgray-scaletwo-colorvideoscreen.Videocontroltechnology,imageprocessing,opticalfibercommunicationtechnologyapplicationswillenha
