1, Lub zog noj muaj pes tsawg leeg ntawm segmented LCD: lub ntsiab kom zoo dua yog los ntawm cov txheej txheem kev
Lub zog noj ntawm segmented LCD feem ntau yog los ntawm peb qhov chaw: kua siv lead ua kua molecule deflection tsav tam sim no, lub zog zoo li qub ntawm kev tsav tsheb IC, thiab kev siv hluav taws xob rov qab (yog tias qhib). Nws qhov txiaj ntsig tseem ceeb yog nyob rau hauv hluav taws xob hluav taws xob tsav cov yam ntxwv ntawm cov khoom siv lead ua kua lawv tus kheej - tsuas yog microampere theem tam sim no yog xav tau los hloov cov txheej txheem ntawm cov kua siv lead ua kua molecules thiab ua tiav cov duab hloov pauv hauv lub xeev.
LCD tsav lub zog siv:
Qhov voltage xav tau rau cov kua siv lead ua kua molecule deflection feem ntau yog 3.3V-5V, thiab qhov tam sim no tsuas yog 5-10 μ A. Qhov no feature ua rau nws lub hwj chim noj ntau tsawg dua active light-emitting zaub yees xws li LED thiab OLED nyob rau hauv backlight dawb hom. Piv txwv li, ib qho 5-nti segmented LCD tsuas yog yuav tsum tau 0.57 μ A tam sim no (hauv tawm nti capacitor voltage faib tsav hom) rau cov zaub zoo li qub, thiab thaum ua ke nrog lub zog qis MCU, tag nrho cov kab ke tam sim no tuaj yeem tswj tau hauv 2.2 μ A.
Tsav IC zog noj:
Kev siv hluav taws xob zoo li qub ntawm cov kab lus tshwj xeeb LCD tsav tsheb chips (xws li HT1621) feem ntau yog qis dua 100 μ A, thaum dhau los ntawm kev siv tshuab multiplexing (xws li 4: 1 multiplexing), lub sijhawm siv hluav taws xob tiag tiag ntawm txhua ntu tsuas yog tso nyiaj rau 25%, ntxiv kom txo tau lub zog siv hluav taws xob. Qhov kev tsim no ua rau loj - qhov loj segmented LCD kom muaj cov yam ntxwv ntawm kev siv hluav taws xob tsawg txawm tias tsav cov qauv nyuaj.
Backlight zog noj:
Backlight yog qhov hloov pauv tseem ceeb cuam tshuam rau lub zog noj ntawm segmented LCD. Lub zog siv ntawm ib lub hlaws LED yog li 15mA. Yog hais tias 10 hlaws dai txuas nrog rau qhov sib npaug ntawm 5-nti npo, lub teeb pom kev siv hluav taws xob tuaj yeem ncav cuag 150mA. Txawm li cas los xij, los ntawm kev tsim ntawm ib lub pob tshab thiab semi-reflective polarizer, lub vijtsam tuaj yeem tua lub teeb rov qab thaum lub teeb pom kev zoo txaus, cia siab rau lub teeb pom kev zoo rau cov zaub. Lub sijhawm no, kev siv hluav taws xob zoo ib yam li ntawm hom tsis muaj teeb pom kev zoo.
2, Kev sib tw siv hluav taws xob loj ntawm - qhov loj me segmented LCD: ciam teb cuam tshuam ntawm kev nthuav dav
Thaum qhov loj ntawm segmented LCD nthuav tawm los ntawm ib txwm me me mus rau ntau dua 5 ntiv tes, kev hloov pauv ntawm lub zog yuav tsum tau ntsuas los ntawm cov kev xav hauv qab no:
LCD vaj huam sib luag cheeb tsam thiab tsav tsheb thauj khoom:
Cov ntxaij vab tshaus loj yuav tsum muaj cov tsav tsheb ntau dua (xws li nthuav tawm los ntawm 32 ntu mus rau 128 ntu), tab sis kev siv lub zog ntawm tus tsav tsheb ICs tsis nce linearly. Piv txwv li, thaum HT1621 tsav 128 ntu, qhov kev siv hluav taws xob zoo li qub tsuas yog nce los ntawm 100 μ A mus rau 120 μ A, nrog kev txwv tsis pub tshaj. Qhov tseem ceeb nyob rau hauv kev xaiv ntawm txoj kev tsav tsheb: siv dynamic scanning tsav tsheb yuav txo tau tam sim no tam sim no, thaum zoo li qub tsav tsheb yuav tsum tau siab dua ncov tam sim no.
Kev loj hlob exponential ntawm backlight zog noj:
Lub backlight fais fab noj yog ncaj qha proportional rau tus naj npawb ntawm LED chips. Yog tias lub vijtsam 5-nti siv ntug LED backlight (xws li 8 LED chips), lub zog siv yog li 120mA; thaum lub teeb ci tag nrho (xws li 32 LED chips) tuaj yeem haus txog 480mA. Nyob rau ntawm lub sijhawm no, lub teeb pom kev siv hluav taws xob tuaj yeem tshaj qhov sib npaug ntawm LCD tsav tsheb thiab tsav tsheb IC, dhau los ua qhov tseem ceeb hauv kev siv hluav taws xob.
Attenuation ntawm multiplexing efficiency:
Me me ntu code LCDs feem ntau siv 4: 1 lossis 8: 1 multiplexing, tab sis rau loj - cov ntxaij vab tshaus loj, qhov multiplexing piv yuav txo mus rau 2: 1 vim qhov nce ntawm cov ntu, ua rau muaj kev nce hauv kev khiav hauj lwm zaus ntawm tus tsav IC thiab static zog noj. Piv txwv li, ib qho 7-nti ntu LCD nce lub zog noj ntawm tus tsav tsheb IC los ntawm 80 μ A rau 150 μ A hauv qab 2: 1 multiplexing.
3, Daim ntawv thov scenario adaptation: nyob qhov chaw ntawm loj -loj segmented LCD
Txawm hais tias loj - loj segmented LCDs ntsib cov teeb meem hauv kev siv hluav taws xob rov qab, lawv tseem muaj qhov hloov tsis tau hauv cov xwm txheej tshwj xeeb:
Cov cuab yeej siv sab nraum zoov thiab cov khoom siv hauv tsev:
Nyob rau hauv cov xwm txheej xws li hnub ci siv dej thiab hluav taws xob ntsuas hluav taws xob, semi pob tshab thiab semi reflective segmented LCD tuaj yeem tua lub teeb thiab tso siab rau lub teeb pom kev zoo. Piv txwv li, ib qho 5-nti hnub ci dej ntsuas ntsuas tau txais cov qauv tsim, uas tsis tas yuav hloov roj teeb thaum nws lub neej 10 xyoo, thiab LCD tsav lub zog siv tsuas yog 5% ntawm tag nrho cov kev siv hluav taws xob.
Tsawg zaus hloov tshiab zaub yuav tsum:
Hauv cov xwm txheej xws li ntsuas kub thiab av noo, cov cuab yeej saib xyuas ib puag ncig, thiab lwm yam, cov ntsiab lus ntawm lub vijtsam tsuas yog hloov kho ob peb zaug hauv ib teev. Lub sijhawm no, lub zog siv hluav taws xob ntawm tus tsav tsheb IC tuaj yeem tsis quav ntsej, thiab tag nrho lub zog siv ntawm lub kaw lus yog txiav txim siab los ntawm lub teeb rov qab. Yog tias lub teeb pom kev tsis siv neeg hloov pauv rov qab siv, lub teeb rov qab tuaj yeem raug tua thaum nruab hnub thiab ua haujlwm ntawm qhov ci qis (xws li 5mA) thaum hmo ntuj, ua kom lub roj teeb lub neej ntev.
Cov ntawv thov raug nqi:
Tus nqi kom zoo dua ntawm qhov loj - qhov loj segmented LCD nyob deb tshaj li ntawm TFT-LCD lossis OLED. Piv txwv li, 5-inch segmented LCD module raug nqi kwv yees li $8, thaum TFT-LCD module ntawm tib qhov loj me raug nqi ntau dua $20. Hauv cov xwm txheej xws li kev tswj xyuas kev ua liaj ua teb ntse thiab cov cuab yeej siv kho mob qis kawg, tus nqi tseem ceeb tshaj plaws ua rau segmented LCD cov kev xaiv uas nyiam.
