Taug kev mus rau hauv ib chav ua yeeb yam nrog peb lossis plaub phab ntsa sib sau ua ke los ntawm cov khoom siv LED ua nyob rau hauv cov khoom sib txawv, thiab feem ntau koj tuaj yeem pom qhov teeb meem yam tsis paub nws lub npe: ib ntu ntawm phab ntsa video zoo li txias dua thiab bluish, seem nyob sib ze zoo li sov dua. Cov vaj huam sib luag tuaj yeem ua tau raws li qhov tshwj xeeb ntawm daim ntawv, tab sis rau lub qhov muag lub seam yog pom tseeb. Cov lus teb engineering yog xim calibration, thiab txawm hais tias yog ib qho ntawm cov kev sib tham tsawg tshaj plaws ntawm LED zaub ntau lawm, nws yog qhov cais qhov "pav- saib" npo los ntawm ib qho zoo sib xws.
Yog vim li cas LEDs drift - thiab yog vim li cas batching ib leeg kho tsis tau nws
Cov tuam txhab lag luam LED tso rau hauv lawv cov diodes los ntawm wavelength thiab luminous flux, ib txheej txheem ua ntej hauv ib tsab xov xwm cais. Binning tau txais koj nyob ze, tab sis nws yog qhov tseeb ntawm pawg txheeb cais: nyob rau hauv ib qho chaw, ib tus neeg chips tseem txawv. Tom qab ntawd kev sib sau ua ke, soldering, thiab tsav- tam sim no kam rau ua ntxiv qhov hloov pauv ntxiv. Thaum lub sij hawm, kev laus coj txawv txawv rau liab, ntsuab, thiab xiav emitters - liab LEDs nyob rau hauv particular degrade nyob rau hauv luminous flux sai dua lwm yam ob txoj kev - yog li lub vijtsam uas zoo ib yam nyob rau ib hnub yuav ya mus rau xim hloov (feem ntau txias dua thiab bluer) tom qab lub hlis hauv teb.
Qhov no ua rau ob qho teeb meem sib txawv:
Static kho- kho module-rau-module sib txawv uas muaj nyob rau hauv ntau lawm.
Drift them nyiaj- taug qab yuav ua li cas peb lub hnub nyoog sib txawv yog li phab ntsa nyob dawb tom qab xyoo ua haujlwm.
Dab tsi calibration ua tau
Calibration yog ib qho kev ntsuas -plus- kho lub voj: lub koob yees duab calibrated los yog spectroradiometer duab los yog scans lub teeb screen module los ntawm module; lub kaw lus ntsuas txhua pawg pixel qhov tseeb qhov ci thiab chromaticity; tom qab ntawd kev kho cov coefficients raug sau rau hauv daim npav txais lossis tus maub los yog li txhua pixel lub luag haujlwm PWM raug kho los yog qis kom haum rau lub hom phiaj dawb (feem ntau 6500 K) thiab lub hom phiaj ci.
Muaj ob theem fidelity:
- Module-level (coarse) calibration- kho qhov ci thiab xim sib txawv ntawm tag nrho cov txee lossis cov khoom siv. Ceev thiab txaus rau phab ntsa qhov twg modules los ntawm tib batch.
- Point-los ntawm-point (zoo) calibration- kho tus kheej LEDs lossis pixel pawg. Qhov no yog qhov tshem tawm pom pixel-theem tsis yog-kev tsis sib xws thiab "dirty screen" thaj ua rau thaj sib txawv me ntsis.
Lub ntsiab lus dawb yog qhov kev xaiv, tsis yog qhov tas mus li
Calibration lub hom phiaj yog pom zoo cov ntsiab lus dawb - feem ntau D65 (6504 K) rau kev ua yeeb yaj kiab, txawm hais tias qee qhov chaw tshaj tawm thiab xinesmas calibrate rau D55 lossis D93 los ntawm kev nyiam. Qhov tseem ceeb yog tias tag nrho cov phab ntsa raug khotib yamlub hom phiaj, thiab hais tias lub hom phiaj gamma thiab xim gamut (xws li, Rec.709 los yog DCI-P3 clipping) yog txhais ua ntej calibration pib, tsis yog tom qab tus neeg siv khoom yws.
Kev ua haujlwm zoo
Ua kom sov cov modules (15-30 min) ua ntej calibration; xim tso zis hloov nrog junction kub.
Txhim kho ambient lub teeb: calibration yuav tsum tshwm sim nyob rau hauv ib tug tswj qhov chaw dim, tsis nyob rau hauv ib tug sib xyaw nruab hnub nrig thiab tungsten.
Scanning qauv: ib daim duab puv -frame tsis txaus; siv ntau yam qauv (xim xim, gradients, checkerboards) yog li lub kaw lus muaj peev xwm paub qhov txawv ntawm -LED nce los ntawm cov qauv- nyob ntawm cov khoom cuav.
Txuag cov ntaub ntawv calibration rau ib qhov project kom tib phab ntsa tuaj yeem rov ua dua -calibrated tom qab tiv thaiv nws tus kheej keeb kwm hauv paus.
Tom qab qhov kev pabcuam teb lossis kev hloov pauv, rov-calibrate. Ib tug tshiab swapped txee ncaj nraim tawm ntawm nws lub thawv yuav luag ib txwm saib txawv ntawm nws cov laus neeg nyob ze.
Dab tsi "calibrated" tsis kho
Calibration txhim khotsis sib xws, tsiskev ncaj ncees. Nws tsis tuaj yeem rov qab poob gamut (lub vijtsam uas nws cov xim liab emitters fading tseem tsis tuaj yeem ntaus liab liab), nws tsis hloov saib -lub kaum sab xis hloov xim (uas yog qhov teeb meem kho qhov muag / ntim, tsis yog software ib qho), thiab nws tsis tuaj yeem kho cov khoom siv misalignment lossis seam khoob. Yog hais tias lub phab ntsa qhia tsis sib xws-tab sis- xim tsis raug, qhov ua rau yog qhov profile lossis cov ntsiab lus -xim-qhov chaw tsis sib haum, tsis yog calibration.
Hauv qab kab
Rau cov neeg yuav khoom, qhov kev siv tau yooj yim yog qhov yooj yim: nug seb koj lub npov xa khoom puas yog lub Hoobkas-calibrated, ntawm qhov twg dawb point, thiab seb puas muaj daim ntawv qhia calibration. Rau cov neeg ua haujlwm, qhov kev tshem tawm yog: calibration tsis yog ib qho - lub sijhawm tshwm sim - nws yog ib feem ntawm lub sijhawm saib xyuas lub neej ntawm lub vijtsam, ib yam li kev hloov kho firmware thiab kev kuaj xyuas cov neeg tsav tsheb rov qab.