LCD PROCESS.ppt
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LCD PROCESS.ppt

LCDPROCESS.ppt

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LCDProcessCrossSectional&PlanViewofanLCDPhotolithographyTypicalITOpatternafterphotolithographyShortsandOpenPIcoatingandBuffingBuffingAngleScreenPrintofSealSpaceringCouplingCouplingofLCDEachlaminateLCFillingBasicStepsformakingLCDCleaningBasicInspectionsManufacturingstepsforTN/STNLCDsTN–TwistedNematic.AtypeofliquidcrystalwhereasthealignmentsurfaceandthereforetheLCmoleculesareoriented90°fromeachsurfaceofglass.Producesimagesintwomodes:PositiveandNegative.PositiveModeprovideswhitebackgroundwithblacksegments.NegativeModeprovidesblackbackgroundandwhitesegments.Whentwopolarizingfiltersarearrangedalongperpendicularaxes,asinthefirstillustration,lightpassesthroughtheleadfilterandfollowsthehelixarrangementoftheliquidcrystalmolecules.Thelightistwisted90degrees,thusallowingittopassthroughthelowerfilter.Whenvoltageisapplied,however,theliquidcrystalmoleculesstraightenoutoftheirhelixpattern.Lightisblockedbylowerfilterandthescreenappearsblackbecauseoftherebeingnotwistingeffect.Themultiplexrateisequaltothenumberofrowsthatcanbedisplayedsimultaneously.Forexample,adisplaywithamultiplexrateof16candisplay16rowsofinformationsimultaneously.TelecommunicationApplicationsTypesofSTNTypicalCOGLCDTheAdvantagesofCOGCOGBondingProcessAutomotiveApplicationsTN-veConfigurationDoubleSTN-DSTNDevelopmentofDSTNTN-veLCDMoreTN-veBM+colour….TheprincipleofLCDSTN-LCDThefieldofvisionofSTN-LCDisbroaderthanthatofTN-LCD.Anditdoesn'tneedthedriveelements,thereforeitisverysuitableforcomputer,PDAandelectricdictionaryapplication.