Tsev > Exhibition > Ntsiab lus

Luv qhia txog cov kua siv lead ua kua

Jun 29, 2018

Luv qhia txog cov kua siv lead ua kua


Cov khoom siv ua dej ua kua thiab kua tshuaj ua kua dej

Lub hauv paus ntsiab lus ntawm cov khoom siv lead ua kua thiab kua siv lead ua kua

Lub discovery ntawm kua Crystal
Kev faib tawm ntawm cov kua nplaum ua kua
Photoelectric cov nyhuv ntawm kua siv lead ua kua
Lub hauv paus ntsiab lus ntawm cov kua siv lead ua kua

Lub discovery ntawm kua Crystal

  Xyoo 1888, Leni FM, Austrian Botanist, pom tias thaum lub sijhawm cua sov ntawm cov roj cholesterol benzoate, nws tau pom tias nyob ntawm 145.5 degrees centigrade, cov khoom siv ua rau cov kua qaub, ua kua thiab ua cov kua dej thaum pib kom txog 178.5 degrees centigrade.

Thaum Lehmann, ib tug German physicist, tau pom cov khoom ntawm lub khoom siv nrog lub tshuab thaub qab, nws tau qhia meej txog qhov tshwm sim thiab npaj cov lus "kua Crystal".

Cov kua siv lead ua kua

Kev tshawb nrhiav cov kua muaj kuab muaj keeb kwm muaj ntau tshaj 100 xyoo, tab sis nws tau tsim sai heev hauv yav dhau los 20 xyoo. Qhov no yog vim hais tias qhov teebmeev ntawm qhov muag khoom ntawm cov khoom siv ua kua. Yog li nws yog siv rau tsawg voltage thiab lub teeb thiab luv luv zaub Cheebtsam.

Tam sim no, cov khoom siv lead ua kua tau siv ntau hauv cov tshuab computer, cov xov tooj hluav taws xob, xov tooj ntawm tes, cov laij lej thiab lwm yam khoom siv hluav taws xob. Nws tau dhau los ua ib qho khoom siv rau kev lag luam.

Cov khoom siv ua kua dej ua rau hauv lub neej

2.png

Txoj kev cais ntawm cov qauv siv lead ua kua

  1. kev faib tawm raws li txoj hauv kev ntawm cov dej qab siv ua kua

  2. raws li daim ntawv ntawm kev tsim molecular thiab kev faib tawm ntawm orde

Kev faib tawm raws li cov qauv ntawm cov kua qaub

Cov kua ua kua siv ua kua (Thermotropic liquid) Cov txheej txheem ntawm cov cua txias yog siv los ua kom dej txias. Thaum twg qhov kub poob rau ib cov degree, qhov orientation ntawm molecules yog yuam, thiab cov kua crystal xeev tau.

Melted kua Crystal Organic molecules yog yaj hauv cov kuab tshuaj, uas ua kom cov concentration ntawm solute hauv kev daws, txo cov concentration ntawm cov kuab tshuaj, thiab npaj cov kev txiav txim ntawm cov organic molecules thiaj li ua tau kua muaj kua.

Cov koog ua qauv ua kua crystalline state

1. pas
2. discoid
3. flexible ntev saw polymer uas muaj ntev saw lossis discoid molecules.
4. Ib daim nyias nyias uas tsim los ntawm kev sib koom tes ntawm niam txiv lub cev

Peb hom qauv ntawm cov kua siv lead ua kua

Nematic:
Cov molecules yuav raug teem nyob rau hauv ib qho kev taw qhia tshwj xeeb thiab muaj ntev ntau ntawm square txiav txim. Txoj kev faib rau ntawm txoj hauj lwm ntawm lub molecule yog teeb meem, thiab tsis muaj qhov ntev ntawm txoj haujlwm. Nws qhia tau hais tias cov yam ntxwv ntawm cov kua thiab yog fluidity.

3.png

Peb hom qauv ntawm cov kua siv lead ua kua

  Hom tshuaj tiv thaiv:
Nyob rau hauv cholesteric, ntev molecules yog tiaj tiaj thiab nyob ntawm kev sib cuam tshuam ntawm pab pawg. Cov axis ntawm lawv txoj sia ntev tuaj yeem sib tw ua ke nyob rau hauv lub dav hlau, thiab qhov kev qhia ntawm qhov ntev ntawm txoj kab ntawm ob kab uas nyob ib sab yog khoov.

4.png

Peb hom qauv ntawm cov kua siv lead ua kua:

   Nyob ze hom siv lead ua:
Tus pas nrig xws li cov qauv khom lub cev muaj nyob rau hauv ib qho qauv ntawm kev sib luag li sib luag, thiab qhov ntev ntawm txoj kab ntawm lub molecule yog ib txheej rau cov txheej. Nyob rau hauv txheej, qhov kev npaj ntawm cov molecules muaj ob seem kev txiav txim, txoj hauj lwm ntawm txoj hauj lwm centroid ntawm lub molecule disordered, thiab cov molecules tsuas txav tau rau hauv txheej no.

5.png

Photoelectric cov nyhuv ntawm kua siv lead ua kua molecules
Ib qho tseem ceeb ntawm lub cev muaj pes tsawg leej piav txog kev tsim tau qhov teebmeem ntawm cov kua siv lead ua kua roj:
1. dielectric coefficient
2. Performance index ntawm refraction

Lub cuab qhov muag ntawm cov khoom siv xaim hluav taws xob

Feem ntau cov kua siv lead ua kua molecules yog tsim los ntawm pas nrig xws li lossis phaj xws li lwg me me, yog li cov yam ntxwv ntawm lub ntsej muag los ntawm txoj kab sib qeeb los yog txoj kev siab ntawm txoj kab xev ntev yog qhov txawv, uas yog qhov sib txawv ntawm cov qauv ntawm cov kua ua kua.
Vim yog ntawm cov qauv siv lead ua kua molecules, cov kua siv lead ua kua molecules muaj cov khoom heteroscedastic ntawd cov dielectric qhov thiab photobacterial coefficient.

Cov ntsiab lus ntawm cov kua siv lead ua kua (LCD) ua kua Crystal Display

1.Light transmittance txoj cai ntawm polarizer
2.Cov phom nyhuv ntawm cov kua siv lead ua kua
3.Qhov feem ntau cov kua siv lead ua kua

Lub hauv paus ntsiab lus ntawm cov kua siv lead ua kua

Lub teeb txoj kab xev ntawm txoj kab sib chaws ntawm kev sib pauv:
Lub polarizer tsuas tso cai rau txoj kev coj ntawm txoj kev tuaj yeem siv los ntawm txoj kev coj ntawm txoj kev coj mus rau txoj kev coj mus rau qhov kev coj ntawm kev coj ua kom tau polarization. Yog hais tias qhov kev coj ntawm cov polarizers ntawm ob lub polarizers yog perpendicular sib, lub teeb tsis dhau los ntawm ob lub polarizations vim hais tias cov kev taw qhia polarization ntawm cov thawj emitted teeb yog perpendicular mus rau kev coj ntawm lub polarization ntawm lub thib ob polarizers.

 

6.png

Lub hauv paus ntsiab lus ntawm cov kua siv lead ua kua

Cov kua siv lead ua tau muab tso rau nruab nrab ntawm ob qho khoom plig. Nyob rau hauv cov kua siv ua kua nematic, qhov kev tsim ntawm tus pas nrig xws li cov pa taws ua ke yog sib luag. Yog hais tias lub iav thiab qis ob iav rods yog perpendicular rau txhua lwm, cov kua siv lead ua kua molecules yuav raug rau hauv lub kauv hauv kev hloov maj mam.

7.png

Lub hauv paus ntsiab lus ntawm cov kua siv lead ua kua

Yog hais tias lub teeb nkag thiab dhau los ntawm thawj lub ncov qaumteb, cov kua siv lead ua kua roj yuav ua rau hloov cov kev coj ntawm polarization. Thaum lub teeb ci ntsa iab los ntawm kev coj ua ntawm kev tsim molecular, qhov kaj yuav xaus rau lwm qhov kawg.

8.png

Yog tias qhov sib ntxiv ntawm ob lub iav daim hlau, qhov kev taw qhia ntawm cov kab sib dhos molecular yuav tsum yog mus raws li cov kev coj ua hluav taws xob. Lub teeb yuav tsis dhau los ntawm cov paib thib ob vim nws tsis tuaj yeem hloov.

9.png

Lub hauv paus ntsiab lus ntawm cov kua siv lead ua kua

Cov kua siv lead ua kua yog kev siv cov cuab yeej no, uas tau ntim nrog cov kua kua qaub ntawm lub nruab nrab thiab qis dua ob kab laj kab ntsig polarizing daim hlau, thiab siv hluav taws xob los tswj cov kev sib hloov ntawm cov kua siv lead ua kua. Qhov sib txawv ntawm qhov sib txawv me me yuav ua qhov ntsuas gray sib txawv.

10.png

Tus qauv ntawm cov kua siv lead ua kua

11.png

Cov kua siv lead ua kua yog kua ua kua dej ua los ntawm ob lub khob hluav taws xob. Lub thawv ntim nrog kua siv ua kua. Lub thawv ntim nrog cov ntaub ntim khoom nruab nrab ntawm lub thawv, thiab ob sab sab nraud ntawm lub thawv muaj nyob rau ntawm cov npov sov.

Peb cov qauv siv lead ua kua

  TN-LCD (ntxig kua nematic kua siv ua kua):
TwistedNematic-LCD Nws yog siv feem ntau hauv tshuab hluav taws xob, lub laij lej.

12.png

Peb cov qauv siv lead ua kua.

  STN-LCD (ultra twisted kua qaub qhob zaub)
Super TwistedNematic-LCD
Siv xov tooj ntawm tes, kev ua si hauv kev ua si

13.png

Peb cov qauv siv lead ua kua

  TFT-LCD (hom yeeb yaj kiab hom ua kua dej):
Thin Film Transistor-LCD
Siv cov kua siv lead ua kua, cov koob yees duab

14.png

Tus qauv ntawm TN thiab STN

Ob sab txheej ntawm daim iav hauv lub thawv ntim hauv cov kua ua kua muaj polarizing daim, thiab cov kabmob ntawm ob lub thauv polarizers yog sib luag (sib txig ntawm cov xim dub dub dub) lossis orthogonal (Tseeb Baixing ntawm cov lus dawb hauv qab dub) , tig mus los yog sib tshooj rau cov kev taw qhia ntawm lub pob zeb siv lead ua saum npoo. Polarizing zaj duab xis yog feem ntau yog ua los ntawm polymer yas zaj duab xis nyob rau hauv tej yam hauj lwm.

15.png

TN hom kua siv lead ua kua

    Nematic kua siv lead ua cov qhob cij nyob nruab nrab ntawm ob lub iav. Cov nplaum ntawm cov iav yog coated nrog ib lub yeeb yaj kiab hluav taws xob ITO (indium tin oxide) rau lub electrode, thiab tom qab ntawd coated nrog rau txheej txheej ntawm PI (polyimide) rau hauv cov iav nrog cov yeeb yaj kiab electrode kom npaj cov kua siv lead ua raws li ib qho thiab thaum uas tig mus rau iav nto. Lub xeev ntuj ntawm cov kua siv lead ua muaj qhov sib txawv ntawm 90 degrees. Kev siv fais fab yuav ua rau cov kua siv lead ua kua molecules tig. Lub taub ntawm lub kua dej ua kua hloov hloov nrog cov khoom siv lead ua kua, thiab txoj kev coj ntawm qhov sib pauv polarized puv tom qab TN hom kua siv lead ua.

TN hom kua siv lead ua kua

Ntev npaum li qhov kom zoo yog xaiv los ua qhov kev sib pauv polarization ntawm lub teeb pauv polarized li 90 degrees, ob lub npoo polarizers siv tau los ua kom lub teeb tsis tuaj yeem ua kom dhau. Qhov loj txaus voltage kuj tseem ua rau kev coj ntawm cov kua siv lead ua mus rau hauv cov kev taw qhia ntawm cov hluav taws xob, thiaj li hais tias txoj kev coj ntawm lub teeb ntawm lub teeb yuav hloov tsis tau, thiab lub teeb yuav dhau los ntawm ob lub thawv polarizers .

                      

16.png


STN hom kua siv lead ua kua

  Lub hauv paus ntsiab lus ntawm STN yog zoo li TN. Nws txawv qhov sib txawv ntawm cov kua siv lead ua kua tshuaj nrog TN torsional direction field rotate 90 degrees teeb meem, thaum STN super plural directional field effect tig qhov 180 ~ 270 degree teeb meem.

17.png

STN hom kua siv lead ua kua

Yooj yim TN LCD zaub nws tsuas yog dub thiab dawb ob leeg xwb, thiab STN kua crystal display yog kev sib raug zoo ntawm cov khoom siv lead ua kua, thiab cov cuam tshuam ntawm lub teeb, vim li ntawd cov xim yog xim ntsuab thiab txiv kab ntxwv xim. Yog tias xim xim ntxiv rau lub duab monochrome STN kua dej ua kua, cov monochromatic zaub pixels muab faib ua 3 daim duab pixels, thiab cov xim liab, ntsuab thiab xiav tso tawm kom pom los ntawm cov xim xim, thiab tom qab ntawd ces xim xim tas hom tuaj yeem tshwm sim los ntawm kev sib haum xeeb ntawm peb lub ntsiab xim.

TFT hom ua kua ua kua

 

18.png

TFT hom ua kua ua kua

   Ib txheej ntawm silicon yog tso rau hauv cov iav substrate thiab ib qho transistor array yog tsim los ntawm kev luam lithography thiab lwm yam kev ua. Txhua lub pixel muaj lub semiconductor hloov, uas zoo ib yam li ib qhov loj hauv kev sib tsuam. Tom qab ntawd cov kua siv lead ua kua perfused ntawm ob daim iav. Vim tias txhua pixel tuaj yeem tswj tau los ntawm tus taw tes mem tes, txhua qhov ntawm kuj ywj siab thiab tswj tau tsis tu ncua. Qhov kev tsim no tsis yog pab txhim kho cov lus teb ntawm qhov kev tshuaj ntsuam, tab sis kuj yog cov tswj ntawm qhov seem grey, ces cov xim ntawm TFT kua siv lead ua muaj tseeb, nws yog hu ua qhov tseeb xim.

TFT hom ua kua ua kua

Rau TFT-LCD xim lim nws tseem ceeb heev, siv cov xim ntsuab, ntsuab, xiav rau peb cov xim, muaj peev xwm sib xyaw rau ntau hom xim, muaj ntau cov duab zaub los siv cov ntsiab cai no los tso xim, peb xim muab faib ua cais cov ntsiab lus, txhua qhov hloov gray sib txawv, thiab tom qab ntawd ces qhov uas peb nyob ze peb RGB tso tawm cov ntsiab lus thaum qhov point. Ua ib pixel

19.png