PWM dimming tswj LED ci ntsa iab los ntawm kev hloov lub zog ntawm lub zog thiab tawm ntawm qhov zaus, feem ntau yog li ntawm 200 Hz mus rau ntau kHz. Qhov nruab nrab tam sim no los ntawm LED - thiab yog li nws pom qhov ci ci - yog txiav txim siab los ntawm lub luag haujlwm lub voj voog, piv txwv li, qhov sib piv ntawm lub sijhawm rau tag nrho lub sijhawm voj voog. Lub voj voog 100% txhais tau tias tag nrho qhov ci, thaum 10% ua rau dim 10% tso zis. Qhov txiaj ntsig tseem ceeb ntawm PWM yog nws qhov tshwj xeeb linearity thiab xim ruaj khov: vim tias LED ua haujlwm ntawm nws qhov ntsuas rau pem hauv ntej tam sim no thaum lub sijhawm on-theem, xim kub tseem nyob tas li thoob plaws txhua theem dimming. Qhov no ua rau PWM zoo tagnrho rau cov ntawv thov uas muaj xim fidelity yog ib qho tseem ceeb, xws li cov khw muag khoom, tsev cia puav pheej, thiab cov duab thaij duab.
Txawm li cas los xij, qhov tseem ceeb parameter yog qhov hloov zaus. Yog tias qhov zaus poob qis dua li ntawm 200 Hz, tib neeg lub qhov muag tuaj yeem pom qhov flicker, ua rau pom kev qaug zog, mob taub hau, lossis txawm tias ua rau muaj mob vwm rau cov neeg raug mob. Cov teeb pom kev zoo tshaj lij feem ntau siv ntau zaus tshaj 1 kHz - feem ntau 20 kHz lossis siab dua - txhawm rau tshem tawm qhov pom flicker tag nrho. Piv txwv li, nyob rau hauv lub high-end chaw ua hauj lwm kho dua tshiab, pab neeg tsim tau teev PWM tsav tsheb nrog ib tug 25 kHz hloov zaus, kom ntseeg tau tias txawm nyob rau hauv high-ceev video kaw, tsis muaj banding los yog flicker artifacts tshwm sim. Qhov kev txwv tseem ceeb ntawm PWM yog tias nws tuaj yeem qhia txog kev cuam tshuam ntawm electromagnetic cuam tshuam (EMI) ntawm cov zaus siab, yuav tsum tau ceev faj tiv thaiv thiab teeb tsa. Txawm li cas los xij, rau feem ntau daim ntawv thov teeb pom kev zoo LED, PWM tseem yog txoj kev siv dav dav tshaj plaws vim nws qhov txiaj ntsig zoo thiab kev ua tau zoo dua.
