LM130A-12C318- sunlight readable12.1"lcdmodule landmarktechnology172componentdrive,sanjose,ca95131(408)434-9302fax:(408)434-0954 08/2002
landmarktechnology LM130A-12C318 p.2 characteristics (note1,2) parameters typicalvalue units conditions lcdscreenluminance 1,350 cd/m 2 white(lcdinoffstate) luminanceuniformity 20%orbetter note3 backlightpowerconsumption 22 watts excludinginverterlosses screendimmingratio 200:1 withlmtbi200ainverter typicallcdcontrastratio 300 whitevs.black(measuredinthe darkatnormaldirection) typicalviewingangles 3:00to9:00direction 55(note4) degrees contrastratio 3 5 6:00to12:00direction +65,-30(note4)degrees contrastratio 3 5 3:00to9:00direction 55(note4) degrees screenbrightness 3 250cd/m 2 6:00to12:00direction +40,-55(note4)degrees screenbrightness 3 250cd/m 2 lcdscreenchromaticity white x=0.345,y=0.365 measuredatthenormaldirection red x=0.623,y=0.345 measuredatthenormaldirection green x=0.322,y=0.557 measuredatthenormaldirection blue x=0.152,y=0.149 measuredatthenormaldirection lcdmoduleweight 820 grams introduction LM130A-12C318isa12.1"highefficiencysunlightreadablelcdmodule.themoduleconsistsofatoshiba ltm12c318lowtemperaturepoly-silicon(ltps)tftcolorlcdpanelandalandmarkveryhighbrightness(vhb) backlightpackagedinacompactsized,edgemountcasewithextremelynarrowboardersoutsidetheactivearea.the LM130A-12C318ismechanicallycompartibletolandmark12.1"lm123-12dg11sunlightreadablelcdmodule. atthemaximumbacklightpowerof12watts,theLM130A-12C318moduledelivers1,350cd/m 2 (nits)oflcd screenbrightness.atthisbrightnesslevel,thedisplayishighlyreadableunderdirectsunlight.inaddition,thecolor toneofthe white displayedonthelcdscreencloselymatchesthecolorofnormalsunlight.withawidedimming rangeinverter,thescreenbrightnesscanbeadjusteddowntolessthan8cd/m 2 . theLM130A-12C318lcdmoduledisplaysasuperbcolorimageat1024x768(xga)resolutionoverambient illuminationlevelsrangingfromtotaldarknesstofullbrightsunshine,makingithighlysuitableforvariousoutdoor applications. note1:pleaserefertothetoshibaltm12c318datasheetfordetailedlcdelectricalspecificationsandgeneralprecautions note2:alldataismeasuredat25 o c 2 o cambienttemperature. note3:uniformity=(l max -l min )/(l max +l min )wherel max (l min )isthemaximum(minimum)luminancemeasuredusinga10 mmdiametermeterapertureoverthelcdactivearea,exceptthelast10mmareafromtheedges. note4:thepositveanglesarealongthe6:00&3:00directionsandthenegativeanglesarealongthe12:00&9:00directions landmarktechnology172componentdrive,sanjose,ca95131(408)434-9302fax:(408)434-0954 08/2002
landmarktechnology LM130A-12C318 p.3 landmarktechnology172componentdrive,sanjose,ca95131(408)434-9302fax:(408)434-0954 08/2002 lcdmoduleopticalperformances thetypicalscreenluminanceandcontrastratiofortheLM130A-12C318sunlightreadablelcdmoduleareshownin thefiguresbelow: thelcdscreenluminanceis measuredwiththelcdinthe off state(i.e.thepixelsarenotenergized). thisisthe white statethatprovides themaximumluminance.veryoften, this off stateisslightylybrighter thanthe white colordisplayedonthe screenwhenthelcdisturnedon.this resultmaybecausedbythelcd controllercardorthevideosignal drivingthedisplay.whenthelcdis properlydriven,thedifference betweentheluminanceofthe off stateandthe white colorshouldbe lessthan10%. theinherentcontrastratio(cr)ofthe lcdistheluminanceratiobetweenthe white andthe black states measuredinadarkroom.inoutdoor environments,thecontrastratioofthe displaydropssignificantlyduetothe reflectionsandglarecausedbythe ambientilluminationatthefront surfaceofthelcdandotherlayers, suchasatouchscreenoraprotective window.
landmarktechnology LM130A-12C318 p.4 landmarktechnology172componentdrive,sanjose,ca95131(408)434-9302fax:(408)434-0954 08/2002 backlightlampconnections theveryhighbrightness(vhb)backlightintheLM130A-12C318moduleutilizesatotalof8coldcathode fluorescentlampstoachievetherequiredluminance.thelampsareelectricallyconnectedinaparallelcircuit: thatis,theyareconnectedatoneside toacommonlead. thelampsareorientedinthe horizontaldirectionwiththe#1lamp atthetopsideofthelcd.thelead wiresconnectingthelampsare terminatedwithtwo11-pinmolex connectors.thefigureontheleft shows the connectorpinout assignments.customizedlampwire terminationswithotherconnectors areavailableonrequest. itisrecommendedthataninverterwitha1200to1300 v rms startingvoltagebeusedtorunthevhbbacklighton theLM130A-12C318module.atthemaximumlcd screenluminance,thelampvoltageandcurrentarelisted below: operatingvoltage 470 v rms lampcurrent 5.7 ma rms atthisdrivingcondition,thebacklightdeliversabout 1,350cd/m 2 lcdscreenluminancewithapower consumptionofabout21watts.sincemostinvertershave anefficiencylevelbetween70-80%,thetotaldcpower inputtotheinverterisabout28to26.3watts.whenthe backlightisdimmeddown,thepowerconsumption decreases. itisquitedifficulttomeasurethelampcurrent accurately.asaresult,ifyouintendtorunthe LM130A-12C318vhbbacklightwithyourown inverter,pleasemeasurethescreenbrightness instead.thenusethebrightnessdatatodeterminethe correctdrivingcondition.todoso,turnonthe invertertooperatethebacklight,butdonotturnon thelcd.makesurethattheroomtemperatureis about25 candrunthebacklightforatleast30 minutesbeforemeasuringthescreenbrightness.ifthe measuredscreenbrightnessexceedsthespecified valuebyasignificantmargin,forexample,morethan 15%,thelampsareover-driven.over-drivingthe lampscancauseasignificantreductioninbacklight life. backlightlampdrivingspecifications
landmarktechnology LM130A-12C318 p.5 landmarktechnology172componentdrive,sanjose,ca95131(408)434-9302fax:(408)434-0954 08/2002 thermalmanagement thevhbbacklightconsumesasignificantamountofpowerandasaresult,thelcdtemperatureofasunlightreadable modulewillbehigherthannormal.inaddition,thefrontsurfaceofanlcdisagoodsunlightabsorber.placingan lcdunderstrongdirectsunlightcancauseasignificanttemperatureriseevenwithoutthebacklightpower. theexactamountoftemperatureriseduetothesetwofactorsdependsonhowthelcdmoduleismountedandalso ontheheatdissipationdesign.forexample,ifthelcdismountedvertically,asignificantportionofthevhbbackight heatwillbedissipatedintotheairwithoutheatingupthelcdpanel.asaresult,thelcdtemperaturerisewillbe low.ontheotherhand,ifthelcdmoduleismountedhorizontally,thenalmostallofthebacklightheatrisestowarm thelcdpanel.however,ifasmallfanoraheatsinkismountedontothevhbbacklight,thetemperatureriseofthe lcdpanelcanbereducedsignificantly.withtheLM130A-12C318moduleoperatingatitsmaximumbrightness,the lcdtemperatureincreaseduetothevhbbacklightisabout10to15 o c.ontheotherhand,theabsorptionofdirect sunlightbythelcdcanheatupthelcdbymorethan40 o cintheextremecases!combiningbothheatingeffects, thelcdtemperaturemayincreasebymorethan55 o c!therefore,someforcedcoolingsolutionisneededtokeepthe lcdtemperaturewithinthespecifiedrange. itisrecommendedthatthelcdtemperaturebemeasuredatfulldisplaybrightnessinyourequipmentunderactual operatingenvironments(forexample,onasummerdaywithfullsunshine).thecoolingsolutionshouldthenbe designedaccordingly.pleaserefertothetoshibaltm12c318datasheetforlcdthermalspecifications.makesure thatthespecifiedmaximumlcdtemperatureisnotexceeded. backlightlife thebacklightlifeisusuallyspecifiedinhalfbrightnesslife,whichisthecummulativenumberofoperatinghours beforethebacklightluminancedropsdownto50%ofitsinitialvalue.thevhbbacklightintheLM130A-12C318 sunlightreadablelcdmoduleisratedat25,000hourswhenitisoperatedatmaximumbrightness.thebacklight lifeismainlydeterminedbythelamplife.lamplifedependsstronglyonthelampcurrent.ifthelampsareoperated atareducedcurrent,thenthehalfbrightnesslifeofthevhbbacklightcanbeextendedfarbeyondthespecified 25,000hours. inactualapplications,averybrightsunlightreadabledisplaywillmostlikelybedimmeddownduringduskandat night.forexample,ifthescreenbrightnessofthelcdmoduleisdimmeddownto2/3ofitsfulllevel,thelamp currentdecreasestoabout4maandthelamplifeincreasestoabout40,000hours.therefore,theactualoperating lifetimeofthevhbbacklightinthelcdmoduleisexpectedtoexceed25,000hoursundermostpracticalsituations. formoredetailedinformationonbacklightlifeissuesandactualtestdataonlandmarkbacklights,pleasereferto technicalnotetk801. disclaimer landmarktechnologyinc.reservestherighttomakechangestothisdocumentandtheproductwhichitdescribeswithoutnotice.in addition,landmarktechnologyinc.shallnotbeliablefortechnicaloreditorialerrorsoromissionsmadeherein;norforincidentalor consequentialdamagesresultingfromthefurnishing,performance,oruseofthisproduct. thisproductshallnotbeusedfororinconnectionwithequipmentthatrequiresanextremelyhighlevelofreliability,suchasmilitary andaerospaceapplications,telecommunicationequipment,nuclearpowercontrolequipmentandmedicalorotherlifesupport equipment.landmarktechnologyinc.takesnoresponsibilityfordamagecausedbyimproperuseofthisproductwhichdoesnot meettheconditionsforusespecifiedinthisspecificationsheet.
|
