Muaj ntau ntau hom interfaces rau kov npo zaub, thiab kev faib tawm yog zoo heev. Nws tsuas yog nyob ntawm kev tsav tsheb thiab kev tswj hom ntawm TFT LCD Screens. Tam sim no, feem ntau muaj ntau hom kev sib txuas rau xim LCDs ntawm lub xov tooj ntawm tes: MCU interface (tseem sau ua MPU interface), RGB interface, SPI interface VSYNC interface, MIPI interface, MDDI interface, DSI interface, thiab lwm yam. TFT module muaj RGB interface.
MCU interface thiab RGB interface yog siv ntau dua.
MCU interface
Vim nws tsuas yog siv nyob rau hauv daim teb ntawm ib leeg-chip microcomputers, nws muaj npe. Tom qab ntawd, nws tau siv dav hauv cov xov tooj ntawm tes qis, thiab nws lub ntsiab feature yog tias nws pheej yig. Lub sij hawm txheem rau MCU-LCD interface yog 8080 tus qauv tsheb npav uas tau npaj los ntawm Intel, yog li I80 yog siv los xa mus rau MCU-LCD npo hauv ntau cov ntaub ntawv.
8080 yog ib hom kev sib txuas sib txuas, tseem hu ua DBI (Data Bus interface) cov ntaub ntawv tsheb thauj mus los, microprocessor MPU interface, MCU interface, thiab CPU interface, uas yeej yog tib yam.
8080 interface yog tsim los ntawm Intel thiab yog ib qho kev sib txuas, asynchronous, ib nrab-duplex kev sib txuas lus raws tu qauv. Nws yog siv rau sab nraud nthuav ntawm RAM thiab ROM, thiab tom qab ntawd siv rau lub LCD interface.
Muaj 8 khoom, 9 khoom, 16 khoom, 18 khoom, thiab 24 khoom rau cov ntaub ntawv me ntsis kis tau tus mob. Ntawd yog, qhov dav me ntsis ntawm cov ntaub ntawv npav.
Feem ntau siv yog 8-ntsis, 16-ntsis, thiab 24-ntsis.
Qhov zoo dua yog: kev tswj tau yooj yim thiab yooj yim, tsis muaj moos thiab synchronization teeb liab.
Qhov tsis zoo yog: GRAM tau noj, yog li nws nyuaj rau ua tiav lub vijtsam loj (saum toj 3.8).
Rau LCM nrog MCU interface, nws cov nti sab hauv hu ua LCD tsav tsheb. Lub luag haujlwm tseem ceeb yog hloov cov ntaub ntawv / lus txib xa los ntawm lub khoos phis tawj tswj hwm mus rau RGB cov ntaub ntawv ntawm txhua pixel thiab tso rau ntawm qhov screen. Cov txheej txheem no tsis tas yuav tsum tau dot, kab, lossis lub moos moos.
LCM: (LCD Module) yog LCD zaub module thiab kua siv lead ua kua module, uas yog hais txog kev sib dhos ntawm cov kua siv lead ua kua zaub, cov khoom sib txuas, cov khoom siv hluav taws xob xws li kev tswj thiab tsav, PCB Circuit Court boards, backlights, structural parts, thiab lwm yam.
GRAM: cov duab RAM, uas yog, daim duab sau npe, khaws cov duab cov ntaub ntawv los tso tawm hauv nti ILI9325 uas tsav lub TFT-LCD zaub.
Ntxiv rau cov ntaub ntawv kab (ntawm no yog 16-ntsis cov ntaub ntawv ua piv txwv), lwm tus yog nti xaiv, nyeem, sau, thiab cov ntaub ntawv / lus txib plaub tus pins.
Qhov tseeb, ntxiv rau cov pins no, yeej muaj qhov rov pib dua tus pin RST, uas feem ntau rov pib dua nrog tus lej 010.
Lub interface piv txwv daim duab yog raws li nram no:
Cov teeb liab saum toj no yuav tsis yog txhua yam siv hauv kev siv hluav taws xob tshwj xeeb. Piv txwv li, hauv qee qhov kev siv hluav taws xob, txhawm rau txuag IO cov chaw nres nkoj, nws tseem tuaj yeem txuas ncaj qha rau cov nti xaiv thiab rov pib dua cov teeb liab mus rau theem ruaj khov, thiab tsis ua rau RDX nyeem teeb liab.
Nws yog ib qho tsim nyog sau cia los ntawm cov ntsiab lus saum toj no: tsis yog cov ntaub ntawv cov ntaub ntawv nkaus xwb, tab sis kuj hais kom xa mus rau lub vijtsam LCD. Thaum xub thawj siab ib muag, nws zoo nkaus li tias nws tsuas yog yuav tsum xa cov ntaub ntawv pixel xim rau lub vijtsam, thiab cov neeg tsis paub qab hau feem ntau tsis quav ntsej cov lus txib xa mus.
Vim hais tias lub npe hu ua kev sib txuas lus nrog LCD npo yog tiag tiag kev sib txuas lus nrog lub LCD screen tsav tsheb tswj nti, thiab cov chips feem ntau muaj ntau yam configuration registers (tshwj tsis yog lub nti nrog cov haujlwm yooj yim heev xws li 74 series, 555, thiab lwm yam), muaj. kuj yog ib qho kev taw qhia nti. Yuav tsum xa configuration commands.
Lwm qhov uas yuav tsum nco ntsoov yog: LCD tsav tsheb chips siv 8080 parallel interface xav tau built-in GRAM (Graphics RAM), uas tuaj yeem khaws cov ntaub ntawv tsawg kawg ib qho screen. Qhov no yog vim li cas vim li cas qhov screen modules siv qhov interface no feem ntau kim dua li cov uas siv RGB interfaces, thiab RAM tseem raug nqi.
Feem ntau: 8080 interface xa cov lus txib thiab cov ntaub ntawv los ntawm lub tsheb npav thaum uas tig mus, thiab ua kom lub vijtsam tshiab los ntawm kev hloov kho cov ntaub ntawv rau GRAM uas los nrog LCM kua siv lead ua module.
TFT LCD Screens RGB interface
TFT LCD Screens RGB interface, tseem hu ua DPI (Display Pixel Interface) interface, kuj yog ib qho kev sib txuas sib txuas, uas siv cov synchronization zoo tib yam, moos, thiab cov kab teeb liab xa cov ntaub ntawv, thiab yuav tsum tau siv nrog SPI lossis IIC serial tsheb thauj mus los. tswj cov lus txib.
Rau qee qhov, qhov sib txawv loj tshaj plaws ntawm nws thiab 8080 interface yog cov ntaub ntawv kab thiab kev tswj kab ntawm TFT LCD Screens RGB interface tau sib cais, thaum 8080 interface yog multiplexed.
Lwm qhov sib txawv yog tias txij li kev sib tham sib tham RGB interface txuas ntxiv xa cov ntaub ntawv pixel ntawm tag nrho lub vijtsam, nws tuaj yeem hloov kho cov ntaub ntawv nws tus kheej, yog li GRAM tsis xav tau ntxiv lawm, uas txo cov nqi LCM zoo heev. Rau kev sib tham sib LCD modules nrog tib qhov loj me thiab kev daws teeb meem, kov npo zaub RGB interface ntawm cov chaw tsim khoom dav dav yog pheej yig dua li 8080 interface.
Yog vim li cas vim li cas lub vijtsam kov zaub RGB hom tsis xav tau kev txhawb nqa ntawm GRAM yog vim RGB-LCD video nco tau ua los ntawm lub cim xeeb ntawm lub cev, yog li nws qhov loj me tsuas yog txwv los ntawm qhov loj ntawm lub cim xeeb, yog li RGB- LCD tuaj yeem ua rau qhov loj dua, Zoo li tam sim no 4.3 "tsuas yog suav tias yog nkag-theem, thaum 7" thiab 10" cov ntxaij vab tshaus hauv MIDs tau pib siv dav.
Txawm li cas los xij, thaum pib ntawm kev tsim ntawm MCU-LCD, nws tsuas yog yuav tsum xav txog tias lub cim xeeb ntawm ib lub microcomputer me me, yog li lub cim xeeb tau tsim rau hauv LCD module. Tom qab ntawd lub software hloov kho lub cim xeeb video los ntawm cov lus txib tshwj xeeb, yog li lub vijtsam kov lub vijtsam MCU feem ntau tsis tuaj yeem ua kom loj heev. Nyob rau tib lub sijhawm, cov zaub hloov tshiab nrawm nrawm dua li ntawm RGB-LCD. Kuj tseem muaj qhov sib txawv hauv cov duab hloov pauv cov ntaub ntawv.
Lub vijtsam kov zaub RGB lub vijtsam tsuas yog xav tau lub cim xeeb video los npaj cov ntaub ntawv. Tom qab pib cov zaub, LCD-DMA yuav cia li xa cov ntaub ntawv hauv lub cim xeeb video rau LCM los ntawm RGB interface. Tab sis lub vijtsam MCU yuav tsum xa cov lus txib kom hloov kho RAM hauv MCU (uas yog, RAM ntawm MCU screen tsis tuaj yeem sau ncaj qha).
Cov zaub ceev ntawm kov npo zaub RGB yog pom tseeb sai dua li ntawm MCU, thiab hais txog kev ua yeeb yaj kiab, MCU-LCD kuj qeeb dua.
Rau LCM ntawm lub vijtsam kov zaub RGB interface, cov zis ntawm tus tswv tsev yog cov ntaub ntawv RGB ntawm txhua pixel ncaj qha, tsis muaj kev hloov pauv (tshwj tsis yog kev kho GAMMA, thiab lwm yam). Rau qhov kev sib tshuam no, yuav tsum muaj tus tswj hwm LCD hauv tus tswv tsev los tsim cov ntaub ntawv RGB thiab taw tes, kab, thav duab synchronization teeb liab.
Feem ntau cov ntxaij vab tshaus loj siv RGB hom, thiab cov ntaub ntawv xa tawm me ntsis kuj tau muab faib ua 16 khoom, 18 khoom, thiab 24 khoom.
Kev sib txuas feem ntau suav nrog: VSYNC, HSYNC, DOTCLK, CS, RESET, qee qhov kuj xav tau RS, thiab tus so yog cov ntaub ntawv kab.
Lub interface technology ntawm kev sib tham sib zaub LCD yog qhov tseem ceeb TTL teeb liab los ntawm qhov kev xav ntawm qib.
Cov khoom siv sib txuas ntawm cov khoom siv sib tham sib LCD yog nyob ntawm TTL, thiab cov khoom siv sib cuam tshuam ntawm cov khoom siv sib tham sib LCD kuj nyob rau theem TTL. Yog li ob ntawm lawv tuaj yeem txuas ncaj qha, xov tooj ntawm tes, ntsiav tshuaj, thiab cov rooj sib tham txhim kho ncaj qha rau hauv txoj kev no (feem ntau txuas nrog cov kab hloov pauv tau yooj yim).
Qhov tsis xws luag ntawm TTL qib yog tias nws tsis tuaj yeem kis tau deb dhau. Yog hais tias lub vijtsam LCD nyob deb dhau ntawm lub motherboard maub los (1 meter lossis ntau dua), nws tsis tuaj yeem txuas ncaj qha rau TTL, thiab yuav tsum hloov pauv.
Muaj ob hom kev sib cuam tshuam rau xim TFT LCD cov ntxaij vab tshaus:
1. TTL interface (RGB xim interface)
2. LVDS interface (pob RGB xim rau hauv cov teeb liab sib txawv).
Cov kua siv lead ua kua TTL interface yog tsuas yog siv rau cov ntxaij vab tshaus TFT me me hauv qab 12.1 ntiv tes, nrog ntau cov kab sib txuas thiab kev sib kis luv luv;
Cov kua siv lead ua kua LVDS interface yog tsuas yog siv rau loj-loj TFT cov ntxaij vab tshaus saum 8 nti. Lub interface muaj qhov sib kis tau ntev thiab cov kab me me.
Lub vijtsam loj txais ntau hom LVDS, thiab cov tswj tuav yog VSYNC, HSYNC, VDEN, VCLK. S3C2440 txhawb nqa txog 24 cov ntaub ntawv tus pins, thiab cov ntaub ntawv tus pins yog VD [23-0].
Cov duab cov ntaub ntawv xa los ntawm CPU lossis daim npav duab yog TTL teeb liab (0-5V, 0-3.3V, 0-2.5V, lossis 0-1.8V), thiab LCD nws tus kheej tau txais TTL teeb liab, vim TTL teeb liab yog kis tau los ntawm kev kub ceev thiab kev ncua deb Lub sijhawm ua haujlwm tsis zoo, thiab lub peev xwm tiv thaiv kev cuam tshuam tsis zoo. Tom qab ntawd, ntau hom kev sib kis tau raug npaj, xws li LVDS, TDMS, GVIF, P&D, DVI thiab DFP. Qhov tseeb, lawv tsuas yog encode TTL teeb liab xa los ntawm CPU lossis daim npav daim duab rau hauv ntau lub cim rau kev sib kis, thiab txiav txim siab lub teeb liab tau txais ntawm sab LCD kom tau txais TTL teeb liab.
Tab sis tsis muaj teeb meem dab tsi kis tau tus mob tau txais, qhov tseem ceeb TTL teeb liab yog tib yam.
SPI interface
Txij li thaum SPI yog ib qho kev sib kis, kev sib kis bandwidth yog txwv, thiab nws tsuas yog siv tau rau cov ntxaij vab tshaus me, feem ntau rau cov ntxaij vab tshaus hauv qab 2 ntiv tes, thaum siv los ua ib qho screen LCD interface. Thiab vim nws ob peb kev sib txuas, kev tswj software yog qhov nyuaj dua. Yog li siv tsawg dua.
MIPI interface
MIPI (Mobile Industry Processor Interface) yog ib qho kev sib koom ua ke tsim los ntawm ARM, Nokia, ST, TI thiab lwm lub tuam txhab hauv xyoo 2003. complexity thiab nce kev yooj yim tsim. Muaj ntau pawg WorkGroups nyob rau hauv lub MIPI Alliance, uas txhais tau ib tug series ntawm xov tooj ntawm tes nyob rau hauv interface qauv, xws li lub koob yees duab interface CSI, tso saib interface DSI, xov tooj cua zaus interface DigRF, microphone/hais lus interface SLIMbus, thiab lwm yam. Qhov zoo ntawm ib tug unified interface txheem yog tias cov tuam txhab xov tooj ntawm tes tuaj yeem hloov tau yooj yim xaiv cov chips sib txawv thiab cov khoom siv los ntawm kev ua lag luam raws li lawv cov kev xav tau, ua kom sai thiab yooj yim dua los hloov cov qauv tsim thiab kev ua haujlwm.
Lub npe tag nrho ntawm MIPI interface siv rau lub vijtsam LCD yuav tsum yog MIPI-DSI interface, thiab qee cov ntaub ntawv tsuas yog hu nws DSI (Display Serial Interface) interface.
DSI-compatible peripherals txhawb ob hom kev ua haujlwm yooj yim, ib qho yog hom kev hais kom ua, thiab lwm yam yog hom Video.
Nws tuaj yeem pom los ntawm qhov no tias MIPI-DSI interface kuj muaj cov lus txib thiab cov ntaub ntawv sib txuas lus tib lub sijhawm, thiab tsis xav tau kev sib cuam tshuam xws li SPI los pab xa cov lus txib.
MDDI interface
Lub interface MDDI (Mobile Display Digital Interface) tau thov los ntawm Qualcomm hauv 2004 tuaj yeem txhim kho kev ntseeg tau ntawm cov xov tooj ntawm tes thiab txo qis kev siv hluav taws xob los ntawm kev txo cov kev sib txuas. Kev vam khom rau Qualcomm kev lag luam sib koom hauv kev ua lag luam ntawm cov chips mobile, nws yog qhov kev sib tw sib tw nrog MIPI interface saum toj no.
MDDI interface yog raws li LVDS sib txawv kis tau tus mob thev naus laus zis thiab txhawb nqa qhov siab tshaj plaws ntawm 3.2Gbps. Cov kab teeb liab tuaj yeem raug txo mus rau 6, uas tseem muaj txiaj ntsig zoo heev.
Nws tuaj yeem pom tias MDDI interface tseem xav tau siv SPI lossis IIC txhawm rau xa cov lus tswj hwm, thiab nws tsuas yog xa cov ntaub ntawv nws tus kheej xwb.
Post lub sij hawm: Sep-01-2023