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TFT - Kev tsav tsheb hauv kev lag luam hauv LCD thiab kev paub txog kev sib cog lus

TFT - Kev tsav tsheb hauv kev lag luam hauv LCD thiab kev paub txog kev sib cog lus

Sep 28, 2017

TFT - Kev tsav tsheb hauv kev lag luam hauv LCD thiab kev paub txog kev sib cog lus

TFT-LCD tso txujci

Qhov kev txiav txim ntawm lub npov TFT zoo li kev hloov (Hloov), thiab lub luag haujlwm ntawm cov kua siv lead ua kua yog zoo ib yam li ntawm lub capacitor, xws li, Hloov ntawm ON / OFF tshiab / tuav cov nqi hluav taws xob qhov tseem ceeb ntawm lub capacitor .

Nyob ntawm SW ON, qhov teeb liab yog sau (ntxiv, kaw tseg) rau cov kua ua kua dej ua kua, uas tsis pub lub teeb liab tawm ntawm cov kua siv ua kua dej nyob hauv SW OFF.

Thaum tsim nyog, tus tuav lub cev muaj peev xwm txuas nrog rau cov khoom siv ua kua ua kom lub cev ua kom nws zoo dua qub.

Cov duab nram qab no yog qhov sib npaug ntawm TFT pixels. Lub rooj vag kab txuas tag nrho lub npov ntawm TFT rooj sab laj ntawm sab nraud, thaum cov kab uas txuas tau txhua qhov TFT qhov chaws electrodes rau tib txoj kab.

Thaum ON, cov ntaub ntawv ntawm qhov Chaw Kab ntawv sau rau cov kua siv lead ua kua capacitor. Nyob rau ntawm lub sij hawm no, lub npov TFT yog tsawg impedance (RON), thiab thaum lub OFF yog Kab, lub npov TFT yog qhov siab impedance (ROFF), uas ua rau tsis muaj qhov leakam ntawm Cov Ntaub Ntawv Tau Los.

Lub rooj vag kab ntxiv thiab qhov hluav taws xob ua rau lub SW tig mus, thiab Qhov Chaw Kab Pib ntsig txog lub capacitor (nyob rau hauv daim ntawv ntawm qhov hluav taws xob) thiaj li tswj tau lub qhov tawg ntawm lub kua siv lead ua kua molecule kom paub cov zaub.

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TFT-LCD tsav txoj cai

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Cov teeb liab los ntawm qhov Interface Connector muaj xws li fais fab VDD, cov cim kev qhia, thiab kev tswj cov teeb meem. Lub VDD mus rau hauv DCDC Converter thiab ua ib 3.3V cov khoom siv hluav taws xob DVDD, uas xav tau kev pab los ntawm SOURCE, IC, GATE, IC, thiab T / CON. Qhov sib luag yog analog mov voltage AVDD. Nws muab khoom siv rau hauv Gamma seem, qhov Chaw Txuas Lus IC. Los ntawm DCDC, muaj TFT qhib voltage Von thiab tua hluav taws xob Voff. Cov cim kev qhia thiab cov cim kev qhia tau raug nkag mus rau hauv T / CON, uas tsim cov sijhawm tswj kev tswj thiab xa mus rau Lub Chaw, IC, thiab GATE IC nrog rau cov ntaub ntawv. Tus Gamma Circuit yog siv los ua kom muaj qhov Gamma reference voltage, uas yog xa mus rau qhov chaw IC, thiab qhov tseem ceeb voltage coj los sib piv rau txhua tus grey qib hloov ntawm DA converter hauv qhov chaw IC. Vcom (CF reference voltage) yog tsim los ntawm VCOM Circuit Court thiab feem ntau yog nkag los ntawm PCB lub rooj tsavxwm mus rau lub vaj huam sib luag ntawm Source, IC, thiab Gate IC

Tsav txoj cai thuam _PCB Block

Fais fab Block

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Cov Ntaub Ntawv Pov Thaiv

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PCB Thaiv daim ntawv qhia lub cev

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Txhav txoj cai _DVDD

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keeb

lub xeev

Kev Tiv Thaiv Ib Nrab

tshwm sim

R218

Luv luv

DVDD = 4V

OK

R218

Qhib

DVDD = 1.2V

Dawb npo

R219

Luv luv

DVDD = 2V

Dawb npo gradient dub npo

R219

Qhib

DVDD = 3.6V

OK

Capacitor C223, C224,

C266 luv luv Circuit Court ua DVDD voltage 0, dawb vijtsam, C225 luv Circuit Court DVDD = 2V, dawb screen npo npo dub

Tsav txoj cai tso cai

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C201 ~ C203, C216 ~ C221, luv luv Circuit Court, AVDD = 0, dawb screen;

keeb

lub xeev

Kev Tiv Thaiv Ib Nrab

tshwm sim

R216

Luv luv

-

OK

R216

Qhib

AVDD = 16V

OK

R217

Luv luv

AVDD = 6V

A / D, raws li qhia hauv daim duab 1

R217

Qhib

AVDD = 4.6V

Dawb npo

R261

Luv luv

-

OK

R261

Qhib

AVDD = 4.6V

Dawb npo

C284

Luv luv

AVDD = 6.3V

Lub grayscale phem, raws li qhia hauv daim duab 2

C282

Luv luv

AVDD = 4.6V

Dawb npo

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Daim duab 1 A / D Daim duab 2 pluag grey, dawb npo

Tsav txoj cai _T / C (input)

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1.Cov khoom siv hluav taws xob input input voltage nrog ib tug multimeter tuaj yeem pab nrhiav tau yog tias muaj cov lus qhia txawv txav. Yog tus Connector tus pin yog skewed thiab lub teeb liab tsis tuaj yeem input, qhov ntsuas qhov ntsuas yuav txawv txav. Tus nqi ntsuas ntawm qhov kev tawm tswv yim feem ntau yog 1.1 ~ 1.3V

2.Cov ntsuas qhov impedance ntawm txhua qhov input nkag rau lub hauv paus impedance los ntawm kev siv lub ntsuas, nws tuaj yeem raug kev cuam tshuam seb T-CON puas lawm (qhov kev tawm tsam tau muab tso hauv T-CON), xws li lub impedance ntawm cov kev ntsuam xyuas taw tes rau hauv av yog 0, thiab qhov kev puas tsuaj hauv T-CON tau paub

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B1O1, qhib, T-CON, tsis muaj tswv yim, dawb screen. B101, luv luv, xav tshuaj

Cov ntsiab lus tsav - txuam resistor

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1., qhov txawv txav (ntsuas tus nqi yuav tsum yog 50 ohms), grey-scale image A / D, xws li

2. kuaj taw rau lub plaj luv luv hauv av, tsis pom kev zoo, xws li kev cai (feem ntau qhov COF electrostatic tu

Lub ntsiab lus tsav tsheb _ / voltage control signal (18.5)

Qhov hluav taws xob qhov hluav taws xob:

VDD: ntxiv cov khoom hluav taws xob (5V)

DVDD: digital voltage. (3.3V)

AVDD: analog voltage. (12V)

Von:, TFT, Lub rooj vag rooj vag ON voltage. (27V)

Voff: TFT, Lub rooj vag rooj vag kaw tawm ntawm qhov hluav taws xob. (- 7V)

VCOM: CF (xim lim) sab hauv kev siv hluav taws xob (5.5V)

Gamma voltage: V1 = 11.48V, V2 = 11.36V, ----- V10 = 3.59V, V11 = 3.21V, V12 = 2.53V, V13 = 0.43V, V14 = 0.16V

tswj teeb liab

Tswj cov teeb liab rau qhov chaw tsav tsheb

STH: pib lub teeb liab rau cov ntaub ntawv qhia txog kab

CPH: qhov chaw tus neeg tsav tsheb lub sij hawm teeb liab (cov ntaub ntawv synchronization teeb)

TP lossis Load: qhov teeb meem tawm ntawm cov ntaub ntawv tawm los ntawm tus neeg tsav tsheb tuaj tso saib

MPOL (cov ntaub ntawv rov qab): yuav kom tsis txhob ua kua dej ua kua, qhov voltage ntawm cov kua dej ua kua yuav tsum tau ua rau lub cev tsis muaj zog.

Tswj lub teeb liab rau rooj vag tsav

STV (Pib, Ntsug): Pib teeb liab pib

CPV (Moos, Pulse, Ntsug): lub tsiv teeb ntawm daim phiaj

OE1 (Tso Zis Tso, Pab Ua Tau): Lub rooj laj kab zij zis tswj kev teeb tsa

OE2 (Zov, Qib, Qhov Rooj): lub teeb liab rau ntau grayscale