低功耗26万色TFT液晶单芯片驱动器集成电路毕业论文外文翻译.docx
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低功耗26万色TFT液晶单芯片驱动器集成电路毕业论文外文翻译.docx
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低功耗26万色TFT液晶单芯片驱动器集成电路毕业论文外文翻译
附录A
LowPower260kColorTFTLCDOne-chipDriverIC
Abstract
Inthisstudy,wepresenta260k-colorTFTLCDone-chipdrivingICthatconsumesunder5mWinthemodule,whichisexceptionallylowpowerconsumption.Toreducepowerconsumption,weusedmanypower-loweringschemesinthelogicandanalogdesign.AdriverICfordrivingLCDshasabuilt-ingraphicSRAM.Besideswriteandreadoperations,thegraphicSRAMhasascanoperationthatissimilartothereadoperationofonerow-line,whichisdisplayedononelineinanLCDpanel.Currently,theembeddedgraphicmemoryisimplementedbyan8-transistorleafcellanda6-transistorleafcell.Weproposeanefficientscanmethodfora6-transistorembeddedgraphicmemorythatisgreatlyimprovedoverpreviousmethods.TheICisimplementedina0.18umprocess.The0.18ummixedprocessisfirstlyusedinworld.
1.Introduction
Currenttelecommunicationtechnologyhasimprovedamazingly.Theseimprovementshaverevitalizedhand-heldmodulesandincreasedservices.Becauseofthis,itisevenmoreimportantthatthechipenablevoicecommunication,data,graphicimages,andmovingpictures.Touseahand-heldmoduleforalongertime,eachchipneedstobecomesmallerandconsumelesspower.
Improvementsintelecommunicationshavemadedisplaytechnologyimprovetoo.Thesizeofdisplayequipmenthasbecomebiggerandtheresolutionhigher.Duetothis,powerconsumptionofdisplayequipmenthasalsobecomehigher.Powerreductionfordisplayequipmenthasbecomeaveryimportantissue.Thedisplayequipmentinhand-heldphonesissupertwistednematic(STN)andthinfilmtransistor(TFT)LCDs.Electro-luminescencewillbeapracticalutility.Displaymaterialcanhaveanalteredarrangementaccordingtothelevelofvoltageortheamountofcurrent.Inaccordancewiththearrangement,therateofatransmissionchanges.Wecancontrolthebrightnessofadisplaypanel,andtheblack/whitedisplaypanelisimplementedwiththismethod.Themulti-colordisplaypanelisimplementedbyarranginganRGB(red,greenandblue)colorfilter.Thecolorrectangularpanelissuppliedbyrow-directvoltageandcolumn-direct.voltage.Thedifferenceofthetwodirectvoltagesisthedrivingvoltageofthepixels.Thismethodiscalledmultiplexaddressing.TheLCDdriverICgeneratesandsuppliesthevoltagelevel.
Thispaperpresentsa260k-colorTFTLCDone-chipdrivermodulethatconsistsofagatedriverandsourcedriver.Thegatedrivergeneratesthedrivingvoltageofcolumndirectionandcommonvoltage.Figure1showshowtheTFTarrayisconstructed.Thegatedrivingvoltageisoftwotypes:
aselectedlevelandanon-selectedlevel.Thelevelofthesevoltagesisdeterminedbythecharacteristicsofeachpanel.Whenonegatelineisselected,thesourceICdrivesdatavoltagelevelsthatarevaluedbydecodingstoreddata.Thedifferentvoltageofthegate’sselectedlevelandsource’sdataleveldeterminethedisplaymaterialarrangement.
Currently,Withahighercolorresolution,theembeddedmemorycapacityneedstobebiggerintheLCDdriverIC.Withalargermemorycapacity,themetallinefromthelogicparttothememoryneedstobelonger.Becauseofthis,theembeddedgraphicmemory-addressingblock,theembeddedgraphicmemorycontrolblockinthelogic,andatimecontrolblockintheembeddedgraphicmemorybecomesmoreimportantindesigningtheembeddedgraphicmemory.TheinternalcontrolblockintheembeddedgraphicmemoryisespeciallyimportantinACcharacterization.
Thepowerconsumptionofthemergedmemoryalsobecomesaveryimportantissue.Withahigherresolutionandbiggerpanel,abiggerembeddedmemorysizeisnecessary.Becauseofthis,shrinkingtheRAMsizeisadominantfactorinthechipsizeofadriverIC.Becauseofthesefactors,thearchitectureoftheembeddedmemorywasimprovedfroma8-transistorSRAMarchitecturetoa6-transistorSRAMarchitecture.
Inthispaper,sectionIIpresentsthearchitectureofgraphicdrivingIC.SectionIIIdiscussesthearchitectureofthe8-transistor/6-transitorembeddedgraphicSRAMandthearchitecturaldefectofthewrite/read/scanmethodin6-transistorarchitecture.InsectionIV,alowpowerscanmethodin6-transistorarchitectureisproposed.Inthischapter,anotherlowpoweraccessedmethodisproposed.InChapterV,theimplementedsampleiscomparedinpowerconsumption.Thechipsamplesareimplementedina0.18umprocessandtestedinmanualboard.
Figure.1TFTone-chipdriverICdiagram
2.StructureofthedriverIC
Generally,thedriverICiscomposedofalogicpart,ananalogpart,andamemorypart.TheanalogpartiscomposedoftheLCDdriver,DCDCconverter,voltagedivider,andoscillator.Theoscillatorcircuitgeneratesaclockfordisplay.TheDCDCconvertercircuitreceivesthegeneratedclockandgeneratesthehighest/lowestvoltagelevel.Thevoltagedividercircuitdividesbetweenthehighestandlowestlevel.Thedriverblocksuppliesthevariousvoltagestothepanel.Figure1isablockdiagramoftheimplemented260kTFTone-chipIC.The260kTFTone-chipICiscomposedofalogic,amergedmemory,anoscillator,aDCDCconverterblock,asource/gatedriverblockandacommonvoltagegeneratingblock.
ThelogicpartiscomposedofanMPUinterfaceblock,memory-addressingblock,andtimingcontrolblock.TheMPUinterfaceblockinterfacesbetweenthedriverICandtheexternalMPU.Thememory-addressingblockreceivesthedecodedsignalintheMPUinterfaceandgeneratesthememoryaddress.Theesisterarrayisincludedinthegrayscalegenerator.TheimplementeddrivingIChasthreetypesofadjustment:
agradientadjustment,anamplitudeadjustment,andafineadjustment.Thetimingcontrolblockgeneratesasignal,whichcontrolsthedisplaypanel.
Thegatedriverblockdrivesthegateon/offlevelvoltage(VGH/VGOF).Theeachvoltagegeneratingblocksequencelygenerateseachvoltage.(Fig.2).TheTFTpanelmusthaveacapacitorforstorage.Thedrivingmethodisatwo-typepercapacitorconnectionthatisnamedthecapacitorforstorageinaTFTpanel(CST)onthegateandtheCSTonthecommon.
Theembeddedmemoryisthesameasnormalmemory.Inaddition,theembeddedmemoryhastheoperationofaccessingwhole-bitcellsintheX-address.Theoutputdatafrommemoryistransferredtothesourcedriver.Thesourcedriverdrivesthepanelwiththevoltagelevel,whichisdecodedbytheaccesseddata.Onetime,thegatedrivercircuitselectsonelineofthepanel.Thenexttime,thegatedrivercircuitselectsthenextline,andtheembeddedmemorytransmitsawhole-bitcellinthenextX-address.Thegatedrivercircuitselectsanext-columnline.Withthisaccessingprocess,onelineoftheLCDpanelisdisplayed.
Figure.2.Sequenceofthevoltagegenerator
Figure.3.Theproposedchipmodule
3.Structureofgraphicmemory
TheembeddedgraphicSRAMiscomposedofabitcellcoreblock,I/O&pre-chargeblock,acontrolblock,ascanlinedecodingblock,aword-linedecodingblock,ascanlatchblock,andseveralbufferblocks.Thebitcoreblockstoresdisplaydata.TheI/O&pre-chargeblockcontrolscharginganddischargingofthebit/bitbline.Thescan/wordline-decodingblockcontrolstheword-linecellinthebitcoreblock.Thisblockaccessesstoreddataandstoresdata.Thescan-latchblockdoesscanoperations.
Thecontrolblockreceivesexternalwrite/read/scanenablesignalsfromtheaddress-generatingblockofthelogicpartandregeneratesraminternalsignals.Thereceived-originsignalistransferredthroughalongmetallineandthelengthofthemetallinediffers.Becauseofthis,thewrite-enablesignalofthemostleftword-lineblockcanhaveatimegapwiththemostrightword-lineblock.Theslopeoftheexternalsignalthroughthelongmetallineislowandthedrivengateoftheslopedsignalconsumesmorepower.IftheoriginsignalisusedwithoutrefiningtheI/Oblockandword-lineblock,theoperationofthememoryisunstable.Becauseofthisinstability,asthehigherstoragememoryisembedded,regeneratingthetimingbecomesmoreimportant.
Theregeneratedsignalenablestheaccessoperationwhenthebit/bitblineisperfectlystable.Thecontrolblockhasanauto-detectcircuit,whichdetectsthebit/bitbstabletime.Inthe8-transistorgraphicSRAMarchitecture,theread/writeoperationisthesameasinanormalSRAM.However,aleafcellhastwoadditionaltransistors,whichdirectlyconnecttothestoragepath.Becausetheadditionaltwotransistorsareconnectedtothestoragecellindependentlyofthebit/bitbline,the2-transistorcanindependentlyaccessstoreddata.
Theadditionaltransistorwithadifferentaccesspathmakesitpossibletoaccessstoragedataeventhoughwrite/readisoperating.Becausethe8-transistorhasanindependentscanoperation,thememoryaccesslogicfortheembeddedgraphicSRAMissimple.However,becauseoftheadditional2-transistor,thechipsizeisbiggerthanthe6-transistorgraphicSRAM.InamonoSTNdriverICandalow-resolutionmulti-colorSTNdriver,theembeddedgraphicSRAMsizeisnotdominantinafullchip.Asthepanelbecomesbiggerandtheresolutionbecomeshigher,thesizeoftheembeddedgraphicSRAMbecomesdominantinthedriverIC.Duetothis,currently,the6-transistorembeddedgraphicSRAMisusedin256/65k/260kcolordriverICs.
Figure4.Comparisonof8-trscanand6-trscan.
Ina6-transistorgraphicSRAM,theadditional2-transistorisremoved.Thescanoperationisthesameasinthereadoperation,buttheselectleafcellisawholecolumnlineofonerow.Becausethescanoperationofthe6-transistorgraphicSRAMusesabit/bitbline,whenthewrite
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