Tsev > Exhibition > Ntsiab lus

Backlight

Sep 26, 2017

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Feem ntau ntawm TFT siv LCD siv rau ntawm cov xov tooj ntawm tes siv LED ua lub teeb pom kev zoo, thiab muaj peb txoj hauv kev muaj lub teeb pom kev ntawm tus xov tooj uas twb muaj lawm dhau ntawm lub xov tooj txawb:

1, PWM hom, raws li cov khoom tso tawm square square fee piv txwv, tswj kev ziag no.

2, txoj kev poob siab, raws li cov ntsiab lus square square wave logic los tswj cov zis tawm me me.

3, DCS hom, nrog cov tswv yim LCD rau kev ntim tswj tuav nti kom tswj tau cov zis tawm me me.

Yuav muaj kev ntim thaub qab ntawm lub xov tooj txawb xov tooj rau kev tswj tuav tam sim no, thiab muab nti thaub qab nti 8 x 25 rau ntawm TPS61161 ua piv txwv (lwm yam teeb ci ntsa iab).

TPS61161 kev twb kev txuas sib txuas:

CTRL xav txuas rau lub platform ntawm GPIO los yog PMIC GPIO.

Qhov no nti yog PWM hom thiab lub plhaw hom dual lub ntsiab lus nti, ua hauj lwm hom yog raws li nram no:

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Cov lus sau rau saum toj no, lub sab nraud yog PWM, tswj los ntawm GPIO tuaj yeem ncaj qha mus rau ntiv nti nraub qaum, nws tseem ceeb heev kom nco ntsoov tias PWM kev tswj ncaj qha los ntawm PMIC vim tias yog koj siv AP tswj nyob rau hauv qhov system load thaum PWM ua rau muaj kev sib ceg. Qhov qis dua ib nrab ntawm cov kab no yog pulsed, thiab lub logic yuav tsum tau ua kom lub pulse

Cov hom ntaub ntawv yog raws li nram no:

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Cov ntaub ntawv sib thooj rau tus nqi tam sim no yog raws li hauv qab no (tsuas yog ib qho tseem ceeb ntawm qhov tseem ceeb)

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DCS yog qhov nws tus kheej yuav pab txhawb CABC los sis LABC

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Lub hauv paus, xws li cov duab, sab nrauv, siv Mipi DCS lus txib kom tswj tau CABC kev ua haujlwm, LCD register yog

51H (vim qhov muag teeb pom kev zoo 0 ~ 255)

53 H (qhib, kaw)

55H (qauv txawv, manufacturers txhais txawv) backlight

Lub platform los ntawm Mipi pob mus rau 51H 53H 55H rau cov vaj huam sib luag hauv LCD, ntsuas vaj huam sib luag los xyuas lawv cov nqi zoo hauv lub nrig qaum los ntawm pin tus vaj huam sib luag ntawm PWM square waveform rau lub ntsiab lus ntawm nws tus kheej raws li cov duab teeb thiab xa cov nqi ntawm cov platform, lub platform muaj sib npaug PWM yoj nti backlight, backlight nti nyob rau hauv LCD vaj huam sib luag LED tswj qhov voltage hla kev loj me raws li PWM waveform los tswj lub tsom teeb.

Nyob rau hauv DCS hom, nws muaj PWM ntau zaus thiab cov teeb nti thaub qab yog qhov sib txuas nrog qhov teeb meem, kev debugging yuav tsum them sai sai, tag nrho LCD cov zis kawg PWM tau hloov.