high dynamic range global shutter cmos...
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5MP Global Shutter White Paper
All specifications based on Canon’s testing standards and subject to change without notice. ©2017 Canon USA, Inc. v1.1
HighDynamicRangeGlobalShutterCMOSSensor1.BackgroundCMOSImagesensorswithaglobalshutter(GS)areidealforavarietyofapplicationsincludingfactoryautomation,unmannedaerialvehicles,andautomobileadvanceddriver-assistancesystems(ADAS).Fortheseapplications,CMOSimagingsensorswithaglobalshutterareusedtoavoidimagedegradationcausedbyrollingshutter(RS)distortion.Figure1showsanimagequalitycomparisonbetweenarollingshutterimagerandaglobalshutterimager.
TheimagequalitydegradationintherollingshutterimageriscausedbytheexposureprocedureasshowninFigure2.Intherollingshutterexposureprocedure,pixelsineachrowareexposedatslightlydifferentinstances.Thisresultsinatimedelaybetweeneachrowandcausestheimagedistortionwhencapturingveryfastmovingobjects.Ontheotherhand,inaglobalshutterimager,eachpixelrowisexposedsimultaneously;therefore,theimagercancapturethelightsignalsineveryrowwithoutatimedelay.Inadditiontotheglobalshutterfunctionality,imagingsensorsforgeneralapplicationsarestillexpectedtohavehighperformancecharacteristicsinallotheraspects,includinglownoise,highsensitivity,highsaturation,andhighdynamicrange.Keepingthoseadditionalspecificationshighwhileadding
Figure1
5MP Global Shutter White Paper
All specifications based on Canon’s testing standards and subject to change without notice. ©2017 Canon USA, Inc. v1.1
globalshutterfunctionalityisoneofthemanychallengessensordesignersfaceasperformancedemandsincrease.
2.FeaturesofCanon’sglobalshutterimagerCanon’sglobalshutterCMOSsensorhasthecapabilitytocapturefastmovingobjectaccurately(distortion-free).Withinthisnewsensor,Canonintroducednoveldrivetechnologyresultinginadrasticallyenhancedsaturationsignal.Inaddition,Canonengineeredanewpixelstructurewithoptimizedgeometrytocollectlightefficiently,whichachieveshighsensitivityandlownoiseperformance.Theupdateddrivetechnologyalongwiththenewpixeldesignallowssensorperformancewitharemarkablyhighdynamicrangeallowingimagecreationinsituationswherethereisawidedifferenceinbrightness.Figure3showsanimageofCanon’snew5megapixel,2/3inchCMOSsensor.Ithasasquarepixelarrangementwith5.33millioneffectivepixels(2592x2056).Thesensorhasaglobalelectronicshutterforcontrollingthechargeaccumulationtimeandanallpixelprogressivereadoutof120fps.
Figure2
Figure3
5MP Global Shutter White Paper
All specifications based on Canon’s testing standards and subject to change without notice. ©2017 Canon USA, Inc. v1.1
3.TechnicaladvancesForthefirsttime,Canonintroducedalightguidestructurewithintheglobalshutterpixel,makingitpossibletocollectlightfromawidevarietyofangles.Thelightguidecontributestoincreasedsensitivityandwideincidentlightangledetection.Figure4showsaFDTD(Finitedifferentialtimedomainmethod)lightpropagationsimulationwithandwithoutalightguide.Inthissimulation,theincidentlightangleis15degrees.
Figure4
5MP Global Shutter White Paper
All specifications based on Canon’s testing standards and subject to change without notice. ©2017 Canon USA, Inc. v1.1
Figure5graphicallyshowsthesimulationresultswithotherincidentlightanglesconsidered..Theeffectivenessofthelightguidecanbeclearlyseenthroughthissimulationandtheresultingdata.
4.SummaryIncorporatingsuperiorpixeldesign,andintroducingnewdriveandlightguidingtechnologies,CanonhascreatedaglobalshutterCMOSsensorcapableofperformanceinthemostdemandingsituations.Canon'sproprietaryCMOSsensorsareamongthemostadvancedintheworld,capturinghigh-resolutionimagesandfeaturingaccuratecolorreproduction.ThecompanycontinuestoworktoimprovethesensitivityandresolutionofCMOSimagingsensors,allowingthemtoenablenewscientificandindustrialapplications.
Figure5
5MP Global Shutter White Paper
All specifications based on Canon’s testing standards and subject to change without notice. ©2017 Canon USA, Inc. v1.1
5.PreliminarySpecifications
SensorSpecification NoteSensorSize 2/3inch(8.8mmx7.0mm) FilterType RGBon-chipfilter,
Monochrome
Numberofeffectivepixels 2,592hx2,056v Pixelpitch(um) 3.4um MaximumFrameRate(fps) 120fps MainClockFrequency 36MHz RecommendedPowerConsumption 500mW Typ.Fullpixelscanat60fpsSensitivity 28,000e-/lux/sec(TBD) GreenSaturation 14,000e(TBD) Gainx1DarkRandomNoise 3.0e(TBD) Gainx4DynamicRange 73dB(TBD) PowerSupplyVoltage 3.3V,1.2V Package 180-pinceramicLGA Function ROIfunction(8region)
Invertedoutputfunction(horizontalandvertical
Formoreinformationortocontactus:sensors.usa.canon.com•855-79-CANON•[email protected]