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[Typetext][Typetext][Typetext]2014TradeScienceInc.
ISSN:0974-7435Volume10Issue19BioTechnologyAnIndianJournalFULLPAPERBTAIJ,10(19),2014[11084-11089]Designmentofnewtypeanti-glareinterferenceinfraredtouchscreenofhighresolutionJiaoyingChenDepartmentofElectronicandElectricalEngineering,GuangxiVocationalandTechnicalInstituteofIndustry,Nanning,530001,(CHINA)ABSTRACTAsaninteractiveoutputdevice,touchscreencanbeoperatedsoeasilythatitisappliedwidelytodaywhenscienceandtechnologydeveloprapidly.
Infraredtouchscreendesignedwithinfraredlighttheoryisacomparativelyraretypeoftouchscreen,mainlybecauseinterferencecausedbyambientlightcanseriouslyaffectitsworkingperformanceandcannotachievebetterresolutioneffect.
Thesetwodefectsbadlyhinderedpromotionandpopularizationofinfraredtouchscreen.
Thisdifficultydrewattentionofmanyresearchershomeandabroad.
Thisstudywasbasedonbasicdesignprinciplesofinfraredtouchscreen,designedandtestedhowtosolvedefectsofinfraredtouchscreen.
Thedesigndirectionistodevelopakindofinfraredmulti-touchscreenwithstrongcapabilityofanti-glareinterferenceandwithhighresolutionofcourse,thedesigningplanwastestified.
InfraredtouchscreeninthestudycouldcontroltransportingandreceivingcomponentsrealtimethroughCPU.
Infrontofreceivingtube,collimatedradiationchannelchannelwasinstalledwhichreducedinterferenceofambientlightwithitslighttransformationdirectionandsensitivity;itcouldimprovecapabilityofanti-glareinterferenceaboutthreetimes.
Realizationofhighresolutiondependedoncorrespondinglocationoftouchpointswithreceivedinfraredlightsignal;resolutioncouldbeincreasedas2045*768.
KEYWORDSInteractiveoutputdevice;Infraredtouchscreen;Multi-touch;Anti-glare;Resolution.
BTAIJ,10(19)2014Asatechniquewhichisusedwidelyandbecomesanewinputdeviceofcomputer;informationquerydeviceandetc[1].
Itcantechnique.
Informationqueryusercancompletepracticabilityandhigh-gradequalitywhenitembeddedoperatingsystem,measuringsystematpresent:vectorpressuresensor-basedtouchandsurfaceacousticwavetouchscreen.
Resistivewidely.
Throughinsertingglassplate,surfaceaffectedseriouslybylighttransmission;itshorttime.
InfraredtouchscreendecreasesHowever,ambientlightinterferencecanseriouslyenoughresolutioneffectlimitsitsdevelopment.
market;developinganti-glareinterferenceinfraredandvalidationwereconductedwithbasicworkingPRINCIPLEANDDEVELOPMENTSTATUSOFCOMMONTOUCHSCREENSCapacitivetouchscreenInstructureofcapacitivetouchscreen,anotherglassprotectionlayer;inthiswaydrawbackisreflection.
Itsoperatingprincipleelectrodesinlocationoftouchpoint;itismainlythetouchpointwillbetakenaway[4].
StructuralFigure1:PrincipleofcapacitivetouchscreenCapacitivetouchscreenisappliedResistivetouchscreenMulti-layercompoundthin-filmissensorofpressure;whenusertouchesscreen,willbedeterminedafteraseriesofcalculation;showninFigure2:Scratch-resistantPlasticLayerAdhesiveTransparentSpacerLayerITOFigure2:StructureofresistivetouchscreenCurrentresistivetouchscreenhasplasticsurfaceandglassbottom[6];productmainlyinPDA,ATM,large-screenmonitorJiaoyingChenINTRODUCTIONwidelyinthe21stcentury,inalargeextent,touchscreenreplacescomputer;itisusedinindustrialproduction,mediaequipment,canbeconsideredasthemostsimpleandconvenientmancompleterelevantinformationverificationthroughclickingitisappliedfororderingsysteminrestaurant;itisusedinsystem[2]andmovablerobotsystem[3].
Therearefivekindsoftouchscreen,resistivetouchscreen,capacitivetouchscreen,Resistiveandcapacitivetouchscreensarethinfilmtechnologysurfaceacousticwavetouchscreenismadewhichhasfollowingisdifficulttobemaintainedsinceitneedstobekeptclean;decreasesproblemsmentionedaboveinbigextentandhashighseriouslyaffectitsworkingperformance;itsanotherfataldevelopment.
Therefore,thereisnoperfectInfraredtouchscreeninfraredmulti-touchscreenismeaningful.
Inthestudy,boldworkingprinciple.
PRINCIPLEANDDEVELOPMENTSTATUSOFCOMMONTOUCHSCREENSscreen,transparentthin-filmconductorlayerisplatedonwaybothconductorlayerandsensorlayercanbeprotectedprincipleistoconfirmcoordinateoftouchpointbymeasuringcurrentmainlybecausethatwhenusertouchscreenwithfinger,aStructuralprincipleofcapacitivetouchscreenisasshowninFigureFigure1:PrincipleofcapacitivetouchscreenforawiderangeofproductssuchasmostofApple'sproductsisusedinstructureofresistivetouchscreen.
Touchingscreen,resistivechangeoftouchpointwillcalculated;coordinatecalculation;itcanbeoperatedwithhardobject.
StructureofresistiveresistantPlasticLayerTransparentSpacerLayerInnerGlassITOTouchingObjectFigure2:Structureofresistivetouchscreenhashighresolution,atthesametime,itcanwithstandseriousproductcostslowandcanbeproducedconveniently.
Itisappliedmonitorandvendingmachine[7].
11085replaceskeyboardandmousevideogames,restaurant,man-machineinteractionclickingonscreen;ithashighinindustrialequipmentsasofcommontouchscreensscreen,infraredtouchscreentechnologyandareusedthemostfollowingdefects:itcanbeclean;itcanonlyworkforhighstabilityandaccuracy.
fatalflawisthatnotgoodscreentomeetdemandsofboldandinnovativedesignPRINCIPLEANDDEVELOPMENTSTATUSOFCOMMONTOUCHSCREENSonglassscreenandaddprotectedcompletely;itsseriouscurrentpercentageoffourtinycapacitivecurrentofFigure1:products[5].
Touchingscreeniscontrolledbycoordinateoftouchpoint(X,Y)resistivetouchscreenisasTouchingObjectseriousinterferencethroughappliedextremelywidely,11086Designmentofnewtypeanti-glareinterferenceinfraredtouchscreenofhighresolutionBTAIJ,10(19)2014SurfaceacousticwavetouchscreenSurfaceacousticwaveisakindofultrasonicwavewhichistransportedthroughmediumsurface[8].
Surfaceacousticwavetouchscreenusuallyconsistsoftouchscreen,soundgenerator,transmitterandreceiver.
ItsstructureisasshowninFigure3.
;GLUHFWLRQ,QIUDUHG(PLVVLRQ7XEH3URSDJDWLRQ'LUHFWLRQRITherearefivestagesinitsdevelopment:(1)Thefirstgenerationinfraredtouchscreenappearedin1992anditsresolutionwasonly32*32,evenenvironmentalinterferencecouldcausemisjudgment;(2)Thesecondgenerationinfraredtouchscreenhadaresolutionof64*64.
Itwaswithdrawnfrommarketin1994.
Itsanti-glarereferencecapabilitywasimprovedlargelyanditcouldbeusedinsomeindoorenvironments;(3)Thethirdgenerationofinfraredtouchscreenappearedin1997.
Althoughitcouldbeappliedoutdoor,itcouldnotbeusedunderdirectsunshine.
Ithadaresolutionof320*240;(4)In1998,thefourthgenerationofinfraredtouchscreenwaslaunched.
Itsresolutionhadbeendevelopedinto800*600.
Butdevelopmentsmentionedabovewereonlybasedondefectsofinfraredtouchscreen,therewerestillproblemsneededtobesolved;(5)Thefifthgenerationofinfraredtouchscreenwasaqualitativeleapofproductlifeandmaintenance.
Itshadalifeaslongassevenyearsanditsresolutionwas1000*720.
Moreover,itcouldbeappliedevenunderstronglight.
Breakthroughdevelopmentofinfraredtouchscreenareconstantlyconductedintwoaspects:qualityandfunction.
Itsapplicationareaiswidened,includingindustrialcontrol,homeappliancesandetc.
Itcanbesaidthatinfraredtouchscreenhadstoodaheadofothertouchscreensandweregettingmoreandmoreattention.
Appearanceofinfraredmulti-touchscreenBTAIJ,10(19)2014JiaoyingChen11087improvedapplicationandsurvivingcapacityofinfraredtouchscreen.
Thesetechnologicaldevelopmentalsobrokethepatternconsistedoftouchscreensmentionedabove;wecanevenpredictthatinfraredtouchscreenwilloccupy80%ofmarketinfuture,thatapplicationof4inchesandlesswillbeoccupiedbyresistiveandcapacitivetouchscreensandthatsurfaceacousticwavetouchscreenwillexitthestageofhistory.
DESIGNANDVALIDATIONOFNEWTYPEINFRAREDTOUCHSCREENFrameofhardwaredesignInfraredtouchscreenrealizesitsinfraredlightmatrixthroughinfraredemissionandreceivingtubes.
Coordinateoftouchpointcanbecalculatedbymicroprocessor.
Inthestudy,LPC2132ChipwasusedasCPU;infraredemissiontubewasscannedthroughcontrolling74HC595ShiftLatch;eachcorrespondinginfraredreceivingtubewasfoundbyCPUthroughI2CBusLine;relevantvalueoflightintensitywasconfirmed;finally,CPUcalculatedcoordinateoffinaltouchpointandsentinformationtohostcomputerviaserialport.
ItsrealizingwayisshownasinFigure5.
,QIUDUHG(PLVVLRQ7XEH+&$'6,QIUDUHG5HFHLYLQJ7XEH/3&+RVW&RPSXWHU,23RUW,&%XV/LQH6HULDO3RUW&RPFigure5:RealizingprincipleofinfraredtouchscreenMicro-processingcircuitisthecorepartofhardwarecircuitwhichincludesJTAGDebugModule,DrivingInfraredReceivingModule,DrivingInfraredEmissionModuleandSerialPortCommunicationModule.
Itsmainfunctionsareasfollows:(1)Driveinfraredemissionandreceivingcircuit;(2)Judgeandcalculateweathertouchpointoccurredandspecificcoordinateinformationafteroccurrence;(3)Transportcoordinateinformationtohostcomputerthroughserialport;(4)Overallcontrolanddebugwholesystem.
SincecommonstandardRS-232SerialInterfaceisanon-balancedtransmissionwhichcommunicationrateislow,itonlysuitsforcommunicationoflocaldevice[9].
Inthestudy,standardRS-422SerialInterfacewasusedinserialportcommunicationmodulewhichcouldrealizepointtopointcommunicationspeedof10Mb/Sandtransmissiondistanceofover1000meters;italsosupportspointtomulti-pointboth-waycommunication.
Infraredemissioncircuitusesinfraredemissiontubeinwhichinfraredemissiontubesarelinedinorderofelectricityquantityandeachpieceof74HC595Chipscansinfraredemissiontubes.
Inthestudy,EVERLIGHTCompany'sIR333C/HO-Awasusedasinfraredemissiontube.
Mainfunctionofinfraredreceivingcircuitistocollectsignaloflightintensitywhichisfromcorrespondinginfraredemissiontubeandtodeterminefinaltouchingdata.
ADS7830ChipwasusedininfraredreceivingcircuitwhilePT334-6Bwasusedasinfraredreceivingtubewhichwasaphototransistorwithhighrespondingspeedandsensitivity.
Infraredemissionandreceivingtubesmustbekeptcorrespondingonetooneallthetimetimeandtheyplayakeyroleinentireinfraredtouchscreenwork,misjudgmentwillappearoncethereisamistake.
Therearetwokindsofmodulecircuits:5Vand3.
3V.
Externalpowerprovides5Vpowersupplyforsystemwhichisdividedintotwoparts:onepartisforinfraredemissiontubeand74HC595Chipwhiletheotherpartistransferredinto3.
3VcircuitforCPULPC2132andMax3490bytransferringcircuit.
Moreover,powersupplymoduleshallbeabletoprovide2Aoutputcurrent.
RealizationofhighresolutionCalculationmethodofresolutionistotimesdetectedquantityofpointsinXandYdirectionsonscreen.
Resolutionofinfraredtouchscreenwasdeterminedbyquantityofemissioninearlytime,soitwaslowmostofthetime.
Inthisstudy,11088Designmentofnewtypeanti-glareinterferenceinfraredtouchscreenofhighresolutionBTAIJ,10(19)2014theintensityofreceivedinfraredsignalswasquantifiedandclassified,calculatedintensityofconfirmedtouchingsignals;correspondingintensitychangehappenedevenwithtinymovement;inthiswaycoordinateoftouchingpointcouldbedeterminedaccuratelyandhighresolutioncouldbeachieved.
Resolutionoftouchscreenwasdeterminedbyquantityofinfraredtubesandgradeofintensityoflight.
Coordinateoftouchscreenisdeterminedbybothphysicalcoordinateofinfraredtubeandcorrespondingcoordinateoftouchingpoint[10].
DesignofthestudywastestedbyshutterdeviceandstructuredeviceofreceivingvoltageasshowninFigure6.
Figure6:StructureoftestingdeviceAccordingtofinalexperimentaltestingdata,iflightintensitysignalwasthirty-twogradequantified,minimumresolution--0.
0195couldbeachieved.
Ifsizeofappliedinfraredtouchscreenwas600mm*225mm,thenitsresolutionwas2048*768.
Resolutionoftouchscreencanbeimprovedlargelyinthisway.
Realizinganti-glareinterferenceInfraredtouchscreenwhichisbasedinfraredlightprincipleisverysensitivetolightinterference.
Sincethereare50%infraredlightinsunlightofrealenvironment,misleadingandmisjudgmentfortouchscreenwillappearassoonasthereischangeofinfraredlight.
Currentsolutionsareadjustingcircuitstructureandphysicallightprotection.
Theplanusedinthestudywastocombineinstallingcollimatedradiationchannelanddynamicallyadjustingareavalue.
Itcouldimprovecapabilityofanti-glareinterference,specificallyshowninfollowaspects:(1)Installedcollimatedradiationchannelandfilteredlight.
Infraredlightinobliquedirectioncouldbefilteredgreatlywhiletransmissivityinhorizontaldirectioncouldbekept.
Infraredlightofsunlightcouldbefilteredandreducedinmaximumextent;(2)Normalizedlightintensitysignalthroughtransferenceofmodules,transferred"0"statusofeachinfraredreceivingtubeinto0and"1"into0xFF;(3)CPUkeptcollectinglightintensitysignalofinfraredreceivingtube,determinedfinalareavalueanduseditasevidencefortouchingandcalculatingcoordinateoftouchingpoint;(4)Whenuserliftedhisorherhand,CPUcollectedlightintensitysignalin0and1statusofreceivingtube,determinedareavalueanduseditasevidencefornexttouchingpoint.
Throughactualcalculation,itwasfoundthatafterinstallingcollimatedradiationchannel,touchscreencouldkeepworkingeveninsunlightof7500lux.
Itimprovedalmostthreetimescomparedwithformerinfraredtouchscreenwhichcouldonlykeepworkinginsunlightof3500lux.
CONCLUSIONTouchscreenhasoccupiedamainpositioninapplicationofmoderntechnologicalequipment.
Itisakindofinteractivedeviceasamachine.
Howtosolvebottlenecksindevelopmentandwidenitsapplicationarea,likeextremelystrictenvironmentofaviationindustryDesigningplanofnewtypeinfraredtouchscreencanbegoodreferenceforrealizingthesegoals.
Infraredemissioncircuitcaneffectivelycontrolbrightnessofemissiontube;infraredreceivingmodulecanreceivelightintensitysignalandtransportitCPUforcalculation,andfinallyfinalcoordinateinformationisdeterminedthroughcalculationandsenttohostcomputer.
Highresolutioncanbeachievedbyquantifyingandclassifyinglightintensitysignalwhilecapabilityofanti-glarereferencecanbeimprovedbyjudgingareavalueoflightintensityandinstallingcollimatedradiationchannel.
Attheend,multi-touchcontrollingcanberealizedthroughorderlyrecordingcoordinatelocationinformationoftouchingpoint,deletinguselessonesandconsideringorderoftouchingpoints.
Ournextgoalsarerealizingthisfunctiononbiggertouchscreenandfurtherimprovingcapabilityofanti-reference.
Itisbelievedthatinnearfuture,betterinfraredtouchscreenwhichhasmorefunctionsandprovidesmoreconveniencesforpeoplewillappear.
ACKNOWLEDGEMENTSubject:ScienceandResearchProjectofGuangxiEducationDepartment:DevelopingIntelligentCoulombmeterwithElectronicPouchCard,No.
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