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1、外丈翻泽（附外丈原丈丿学院：信息科学与工程学院课题名称基于单片机的定时显示设计专业（方向）:班级:学生:指导教师: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
