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1、外丈翻澤（附外丈原丈丿學(xué)院：信息科學(xué)與工程學(xué)院課題名稱基于單片機(jī)的定時(shí)顯示設(shè)計(jì)專業(yè)（方向）:班級(jí):學(xué)生:指導(dǎo)教師:日期：通信工程通值09包MB牛秦洲2013.4.231.1LEDdisplaybackgroundofthedevelopmentandresearchstatusMoreandmoreplacesinshoppingmalls,railwaystations,docks,subwaystationsandavarietyofworkwindowLEDdotmatrixdisplaygraphicsandcharacters.LEDindustryhasbecom
2、eafast-growingemergingindustry,ahugemarketspaceandbroadprospects.Withtherapiddevelopmentoftheinformationindustry,LEDdisplayhasbeenwidelyusedasanimportantmeansofdisseminationofinformation,contentandservicesaimtopromotetheneedforindoorandoutdoorpublicplaces,suchasindoorandoutdooradvertisingin
3、publicplaces,theairportstationvisitorsguidebusstopvehicles,securitiesandbankinginformationdisplay,restaurantsofferinformationbeansshown,highwayvariableinformationboards,stadiumsthegames,buildinglighting,trafficlights,landscapelighting.Clearly,LEDdisplayhasbecomeanimportantsymbolofthecitylig
4、hting,moderninformationsociety.LEDdotmatrixdesignismainlyusedindisplay,itisalightemittingdiodedotmatrixmoduleorunitofpixelscomposedofaflatdisplayscreen.Becauseithastheadvantagesofhighluminousefficiency,longlife,andflexibleconfiguration,richcolors,andtheindoorandoutdoorenvironmentaladaptabil
5、ity.The1970s,thefirstGaP,GaAsPhomogeneousknotred,yellow,greenandlowluminousefficiencyLEDbegantobeusedindicator,numbers,andtext.FromtheLEDstartstoenteravarietyofapplications,includingaerospace,aircraft,automotive,industrialapplications,communications,consumerproducts,etc.,throughoutthevariou
6、sdepartmentsofthenationaleconomy,andthousandsoffamilies.1996LEDsaleshavereachedbillionsofdollarsaroundtheworld?OvertheyearstheLEDhasbeensubjecttothelimitationsofcolorandluminousefficiency,butbecauseoftheGaPandGaAsPLEDwithlonglife,highreliability,operatingcurrent,andthushasmanyadvantageswith
7、TTL,CMOSdigitalcircuitscompatiblegreenbyuserMi.Inrecentyears,highbrightness,fullcolorLEDmaterialanddevicetechnologyresearchtopicsattheforefront.Theultra-highbrightness(UHB)istheluminousintensityatorabovelOOmcdLED,alsoknownasthecandela(cd)levelLED.Thedeve
