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LCD ntau lub ntsiab lus hauv kev txhooj

LCD ntau lub ntsiab lus hauv kev txhooj

Oct 20, 2017

TFT-lCD nquag siv interfaces, TTL (RGB), LVDS, EDP, MIPI, uas peb feem ntau hais, lub teeb liab ntawm cov interfaces tau ua tus qauv tseem ceeb.

Ib tug, TTL

1, TTL Interface Txheej Txheem

TTL (Transistor Transistor Logic), uas yog transistor transistor logic, TTL theem teeb liab yog tsim los ntawm TTL ntaus ntawv. TTL ntaus ntawv yog ib hom ntawm cov rooj vag digital ntawm kev sib xyuas, uas yog tsim los ntawm cov txheej txheem bipolar. Nws muaj cov yam ntxwv ntawm kev kub ceev, tsawg zog thiab ntau yam.

TTL interface yog sib npaug rau cov ntaub ntawv sib txuas, siv lub interface, tsis tas yuav siv tsav tshwj xeeb hauv lub rooj tsav xwm lub rooj sib tham ntawm cov kua hluav taws xob ua kua thiab cov kav dej ua siv ua kua dej kawg, tab sis tau tsav los ntawm kev tswj cov ntsiab lus TTL ncaj qha kis tau rau cov tib neeg los ntawm cov kev txuas ntawm cable interface ntawm cov vaj huam sib luag hauv LCD. Vim tias cov TTL interface muaj teeb liab siab, muaj ntau txoj kev sib txuas thiab cov kab mob ntev ntev, qhov kev cuam tshuam txog kev cuam tshuam ntawm Circuit Court yog pluag, thiab nws yog ib qho yooj yim los ua kom muaj hluav taws xob electromagnetic (EMI). Hauv cov ntawv siv, tus TTL interface Circuit Court yog siv los tsav me me (15in) los yog tsis tshua daws teeb meem LCD. TTL siab tshaj plaws ntawm pixel tsuas yog 28MHz.

TTL yog lub teeb liab nkaus xwb uas pom tau los ntawm TFT-LCD thaum lub sijhawm teeb liab. Cov ntawv ntim thaum ntxov yog TTL, uas yog, RGB tawm ncaj qha mus rau TFT-LCD.

2, teeb liab hom TTL interface

Lub rooj tsav tsheb tsav TTL tso tawm interface feem ntau muaj peb hom teeb liab, xws li RGB cov teeb liab, lub teeb liab lub suab thiab kev teeb liab. Raws li hauv daim duab nram no:

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(1) lub teeb liab RGB

IB, tib channel TTL

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Tib channel 6bit TTL tso zis interface

Rau 6b ib zaug TTL tso zis interface, tag nrho ntawm 18 RGB cov kab ntawv, feem ntau, R0 ~ R5 liab xim xim 6, G0 ~ G5 ntsuab xim xim 6, B0 ~ B5 xiav xim 6, tag nrho ntawm 3 * 6 = 18. Vim hais tias cov ntaub ntawv tseem ceeb RGB yog 18b, nws tseem hu ua 18 lossis 18bitTTL interface.

Tib channel 8 ntsis TTL tso zis interface

Rau 8b ib txoj kev TTI, cov zis interface, tag nrho ntawm 24 RGB cov kab lus, feem ntau, R0 ~ R7 liab lub ntsiab xim xim 8, B0 ~ B7 ntsuab ntsiab xim 8, BO ~ B7 xiav xim ntaub 8, 8 = 24. Vim hais tias cov ntaub ntawv tseem ceeb RGB yog 24b, nws tseem hu ua 24 npij los yog 24 ntiTTL interface.

B, dual channel TTL

Dual channel, uas yog, ob pawg ntawm RGB cov ntaub ntawv, muab faib ua ib feem ntawm cov channel, txawm tias channel, moos thiab qee qhov tseem faib tawm hauv OCLK / ECLK, thiab ib txhia pejxeem, peb kos duab nyob rau hauv daim ntawv qhia ntawm ob, raws li nram no:

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Dual channel 6 ntsis TTL tso zis interface

6bit dual TTL tso zis interface, tag nrho 36 RGB cov kab ntawv, RGB cov ntaub ntawv yog frontage txoj kab kab 18, txawm tias RGB cov kab 18, 3 * 6 * 2 = 36. Vim hais tias cov ntaub ntawv tseem ceeb ROB 36bit, nws tseem hu ua 36 ntsis lossis 36bitTTL interface.

Dual channel 8 ntsis TTL tso tawm interface

8bit dual TTL tso zis interface, tag nrho 48 RGB cov kab ntawv, RGB cov ntaub ntawv yog frontage txoj kab kab 24, txawm tias RGB cov ntaub ntawv kab 24, 3 * 8 * 2 = 48. Vim hais tias thawj xim RGB cov ntaub ntawv yog 48pib, nws tseem hu ua 48 ntsis lossis 48bitTTL interface.

(2) lub teeb liab lub sijhawm

Refers rau lub teeb liab pixel, yog kev sib kis ntawm cov ntaub ntawv thiab cov ntaub ntawv ntsig txog nyeem cov benchmark. Nyob rau hauv kev siv ntawm khib / Idol dual txoj kev kis tau tus mob RGB, kev sib txawv hauv interface uas siv pixel moos hom yog txawv. Muaj qee cov khoom zis tawm tswv yim / Idol ob txoj kev sib qiv ua ke pixel suab paj nruag output interface, qee tus khib / txawm tias ob txheej feem khij qis pixel thiab txawm tias ob lub teeb liab pixel,

(3) tswj teeb meem

Cov teeb liab tswj nrog cov teeb meem kom muaj cov ntaub ntawv (los yog cov ntaub ntawv qhia tawm ntawm cov teeb liab) DE, kab synchronization HS thiab teeb liab synchronization VS.

Ob, LVDS

1, LVDS Interface Overview

LVDS, uas yog, Tsawg Voltage Differential Signaling, yog qhov qis zog tsawg sib txawv technology tshuab. Cov teebmeem digital yeeb yaj kiab tso tawm los tsim kho kom tsis muaj teeb meem ntawm kev siv hluav taws xob thiab loj EMI electromagnetic cuam tshuam thaum kis tau tus nqi siab ntawm cov ntaub ntawv hauv TTL theem. LVDS output interface siv tsawg heev voltage viav (li 350mV) xa cov ntaub ntawv thoob ob kab hauv PCB los yog ib khub cab cab los ntawm cov ntaub ntawv sib txawv, piv txwv li, tsawg voltage sib txawv signaling. Nrog LVDS tso zis interface, lub teeb liab yuav kis tau rau ntawm PCB kab sib txawv los yog ib lub xov kab sib txuas ntawm ib tus nqi ntawm 175,000 Mbit / S. Tsis tshua muaj zog thiab tsis tshua muaj tsav tam sim no tau txais, thiaj li qis qis thiab qis zog siv tau pom.

2, muaj pes tsawg leeg ntawm LVDS interface Circuit Court

Hauv cov khoom siv kua deg ua kua, LVDS interface circuit muaj ob ntu, LVDS tso tawm qhov kev sib txuas lus ntawm Circuit board (LVDS sender) LVDS input interface Circuit Court thiab LCD vaj huam sib luag (LVDS receiver). Lub LVDS transmitter converts teeb liab TTL rau LVDS qhov teeb liab, thiab tsav tsheb dhau los ntawm cov khoom siv yooj yim ntawm lub rooj tsavxwm thiab cov kua siv ua kua (cable) xa cov teeb liab mus rau sab xis sab LCD ntawm qhov kawg txais LVDS LVDS decoding IC, LVDS receiver and serial cov teeb liab yuav raug hloov mus rau hauv TTL theem teeb liab uas xa mus rau lub npo LCD, sij hawm tswj thiab tsav tsheb sib tw. Ntawd yog, TFT tsuas pom TTL (RGB) cov teeb tseg. Qhov no yog ib feem ntawm qhov kev pab cuam peb ua nyob rau hauv Samsung nrog ntau dua, vim Samsung chip tsis muaj LVDS cov zis, yog li thaum peb siv LVDS TFT-LCD interface los ntxiv ib qho kev hloov siab CHIP (RGB-LVDS), tom qab ntawm peb lub hom phiaj.

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3, hom teeb liab ntawm LVDS interface

LVDS kev teeb tsa muaj cov ntaub ntawv sib txawv thiab cim lub sijhawm sib txawv. Raws li hauv daim duab nram no:

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(1) tib channel LVDS

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Tib channel 6 ntsis cov ntaub ntawv (yog tias nws 6 lub Y3M / P, qhov kab liab no tsis yog)

Muaj 4 pawg ntawm cov kab sib txawv, 3 pawg ntawm cov teeb liab, ib txheej ntawm cov kab suab. Y0M, Y0P, Y1M, Y1P, Y2M, Y2P, CLKOUT_M, CLKOUT_P.

Tib channel 8 ntsis cov ntaub ntawv

Muaj 5 pawg ntawm cov kab sib txawv, 4 pawg ntawm cov teeb liab, ib txheej ntawm cov kab xev. Lawv yog Y0M, Y0P, Y1M, Y1P, Y2M, Y2P, CLKOUT_M, CLKOUT_P.

(2) ob chav channel

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LVDS nyob rau hauv kev sib kis ntawm cov ntaub ntawv daws teeb meem, kev cuam tshuam txog kev cuam tshuam tsis tshua muaj zog, tab sis saum toj 1920X1080 kev daws teeb meem, txoj kev yog ib qho yooj yim, yog li muaj ob txoj kev tshwm sim. Lub hom phiaj yog yooj yim, ua kom zoo, txhim khu kev tiv thaiv kev cuam tshuam.

Dual channel 6 ntsis cov ntaub ntawv

Tsuas yog ob zaug ntawm ib zaug xwb, lub moos tseem yog ob txoj kev, liab qhov: Y3M, Y3P, Y3M1, Y3M1 Cov pawg ob ntawm cov teeb meem tsis txuas nrog.

Dual channel 8 ntsis cov ntaub ntawv

Zoo ib yam li yav dhau los.

Peb, EDP

Qhov kev sib txawv ntawm no yog txawv txawv, Kuv tuaj yeem tiv tau nrog ib qho screen IPAD3, rau siab txhais, xws li 2048 * 1536, goale N10 daws teeb meem 2536 * kuj siv qhov interface no.

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Plaub, MIPI interface

Tias peb lub tuam txhab muaj khoom, tab sis lwm lub platforms, tsis yog peb debugging, Kuv yeej tsis kov. Cia li ib feeb xwb. Mloog nws zoo li qhov interface no zoo sib xws: LVDS, EDP, HDMI, MIPI, tag nrho cov ntawm lawv yog cov ntaub ntawv sib txawv thiab txawv lub moos.

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Tsib, TTL (RGB) rau hauv LVDS

Peb tau siv ob daim ntawm peb tes num: SN75LVDS83B, THC63LVD827 (dual output LVDS), thiab SN75LVDS83B.

1, SN75LVDS83B, tus tswv, LVDS interface LCD piv

Raws li qhia hauv qab no, daim ntawv thov SN75LVDS83B:

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Nyob rau hauv qhov tseeb, tus Samsung chip TTL (RGB) lub teeb liab raug hloov mus rau hauv LVDS qhov sib txawv ntawm cov teeb liab LCD receiver.

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Lub cuab yeej hardware yog raws li nram no:

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2, SN75LVDS83B siv qhov rooj

Qhov tseeb, qhov no yuav tsum faj seeb rau cov lej LCD, koj npo yog 16b, 18b, los yog 24 npij, ntau tus lej LCD muaj ntau qhov sib xyuam xim. Raws li qhia hauv qab no, daim duab thaiv ntawm AP davhlau ya nyob twg los ntawm Samsung exynos4412 hauv cov zis ntawm cov ntawv sib txawv.

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(1), 24bitRGB 24 ntsis LCD

Pom hais tias siv tsib pawg ntawm cov teeb meem sib txawv, plaub teev ntawm ib lub teeb ntawm lub cim suab.

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(2), 24bitRGB 18 ntsis LCD

Nco ntsoov tias siv cov kab xev plaub sib txawv, peb lub teeb ntawm cov cim, ib txheej teev, thiab Y3M thiab Y3P yog NC. AP davhlau ya nyob twg RGB thaiv hom tsis yog tib yam, 6, 7, ob sab av.

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Yog tias txoj hlua txuas hauv (1) (24 xuab zis), txuas mus rau 18 lub vijtsam. 18tshais npo RGB (xim xim) qhia tau tias qhov qub, tab sis muaj cov duab, maj mam hloov tsis zoo li qub. Nws tau ntev nrog sib cav, tab sis qhov teeb meem tau raug daws. Ua cov kev xyaum ua haujlwm yog qhov sib txuas tseem ceeb, qee qhov kev nkag siab ntawm kev paub, yuav ua rau yuam kev hauv kev ua haujlwm.

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Rau, RGB hloov mus rau EDP

Peb muaj ib qho screen, tab sis qhov kev daws teeb meem loj heev, peb lub system yog heev card, thiab thaum kawg nres.

Daim duab thaiv kab yog raws li nram no:

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Sketch Daim Ntawv Qhia:

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EDP teeb liab zoo li LVDS, tab sis nws muaj ntau tshaj li ib qho teeb meem HPD. 图片27.png