FieldEmissionDisplayScreen场发射显示器

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1、FieldEmissionDisplayScreenIntroductionDisplaysaredevicesbywhichwecanviewmovingobjectsUsedintelevisionandcomputersTheyalsohavewideuseinlaboratoriesandinmedicalapplications.HistoryofdisplaysCathoderaytubeLiquidcrystaldisplayPlasmadisplaysElectroluminescentdisplaysFieldemissiondisplaysFEDTechnologyThe

2、FEDscreenmainlycontainsthreeparts:1.Low-voltagephosphorousplate2.Afieldemissioncathodeusingathincarbonsheetasanedgeemitter3.FEDpackaging,includingsealingandvacuumprocessingStructureofFEDLowvoltagephosphorThelowvoltagephosphorsarethescreensinwhichtheimagesaredisplayedInthedisplaytechnologythephospho

3、rscreensactasanode,whichreceivestheelectronsemittedfromthecathodeThephosphorsaremadeupoflayersofthreeprimarycolours-green,redandblueFieldEmissionCathodeInthefieldemissiondisplayscreenthecathodeareelectrongunswhichemitelectronsElectrongunsarecalledmicrotipsTheemissionofelectronsiscalled“coldcathodee

4、mission”MicrotipsareofdifferenttypesWedgetypeemitterusingsilicon.Silicontipswithcontinuouscoatingofdiamondparticles.Single-crystaldiamondparticleonsilicontips.Planardiodeemitter.Metal-insulator-semiconductortypeplanaremitterWedgetypeemitterusingsiliconSilicontipswithcontinuouscoatingofdiamondpartic

5、lesSinglecrystaldiamondparticleonsilicontipsPlanardiodeemitterMetalinsulatorsemiconductortypeplanaremitterFEDpackagingWorkingThefieldemissiondisplayworksabitlikethecathoderaytubeThisemissionofelectronoccursfromthecoldcathodewhenavoltageisappliedbetweenthecathodeandanode.Theseelectronspropagatefromc

6、athodetoanodeTheybombardwiththephosphor,whichistheanodeandcausesittoglowThisreproducestheimageonthescreenbythemixingofcolourspresentinthescreenTwowaysofworkingLowvoltageanodeHighvoltageanodeLowVoltageAnodeInthismethodtheentirescreenisindividuallypaintedineachofthethreeprimarycolours,oneatatime.Asea

7、chofthecoloursarepaintedseparatelyonlythatcolourphosphorisgrounded,sothatalltheelectronscanstrikethatparticularcolourThispreventsanyoftheelectronstostrikeaccidentallytheothercolourspresentinthescreen.HighVo