Umehluko omkhulu phakathi kwekristalu ewuketshezi ne-plasma ukuthi ikristalu enguketshezi kufanele incike emthonjeni wokukhanya okwenziwayo, kuyilapho i-plasma TV ingeyemishini yokubonisa i-luminescence esebenzayo. Okwamanje, ubuchwepheshe obuyinhloko bokukhanyisa ikristalu emakethe buhlanganisa i-LED(light-emitting diode) kanye I-CCFL(isibani se-cold cathode fluorescent).I-LCD ye-LCD i..I-Liquid Crystal Display imfushane ngesibonisi se-Liquid Crystal.Isakhiwo se-LCD siyi-Liquid Crystal ebekwe phakathi kwezingcezu ezimbili zengilazi ezihambisanayo.Kunezintambo eziningi ezincane eziqondile nezivundlile phakathi kwezingcezu ezimbili zengilazi.
I-Liquid crystal ngokwayo ayikhiphi ukukhanya, ingakhiqiza izinguquko zombala kuphela, idinga ukukhanya okungemuva ukuze ibone okuqukethwe kwesibonisi.Umehluko phakathi kwezikrini zelaptop yendabuko, ezisebenzisa amashubhu abandayo e-cathode fluorescent (CCFL) njengesibani sangemuva, nezikrini ezikhanyayo ze-LED, ezisebenzisa ama-diode akhipha ukukhanya (ama-led), yilokho.I-LED emhlophe ingumthombo wokukhanya wamaphuzu, ishubhu ye-CCFL ingumthombo wokukhanya okuhlutshiwe.Amaledi amancane amhlophe anikwa amandla amandla amanje (dc), angasetshenziswa ngokuhambisana, kodwa uma ube nama-watts angaphezu kwambalwa, udinga ukucabangela isekethe yedrayivu efanele ukuze uthuthukise ukusebenza kahle.Ithubhu le-CCFL kumele libe nokusetshenziswa okufanayo “kwepuleti lomfutho ophezulu”. Kukhona nje izinhlobo ezimbalwa zendlela yokukhanya kwe-LCD, okuhlanganisa ne-LED (Light Emitting Diode) ene I-CCFL (I-Cold Cathode Fluorescent Lamp) noma ibizwa nge-CCFT (Cold Cathode Fluorescent Tube).
I-CCFL (i-cold cathode fluorescent lamp) iwumkhiqizo wokukhanya ongemuva oyinhloko we-LCD TV. Isebenza lapho amandla kagesi aphezulu kuzo zombili iziphetho zeshubhu, ishubhu ngaphakathi komthelela we-electronic high-speed ambalwa ngemva kokuba i-electrode ikhiqize ukukhishwa kwe-electron yesibili, iqala ukuphuma, ithubhu le-mercury noma igesi engasebenzi kagesi kagesi ngemva komthelela, imisebe evusa amadlingozi engu-253.7 nm ukukhanya kwe-ultraviolet, ukuvuswa kwe-ultraviolet kwe-tu the phosphors odongeni lweshubhu futhi kukhiqize ukukhanya okubonakalayo.Impilo yesibani ye-CCFL ngokuvamile ichazwa ngokuthi: ku-25℃ izinga lokushisa elizungezile, likalwe isibani samanje sokushayela, ukukhanya kuncishiswe ku-50% wokukhanya kokuqala kobude besikhathi sokuphila kwesibani.Okwamanje, ukuphila okuzisholo kwe-LCD TV backlight kungafinyelela amahora angu-60,000.I-CCFL backlight ibonakala ngezindleko eziphansi, kodwa ukusebenza kombala ayilungile njenge-backlight ye-LED.
I-backlight ye-LED isebenzisa i-LED njengomthombo we-backlight, okuwubuchwepheshe obuthembisa kakhulu ukufaka esikhundleni sethubhu ye-cathode fluorescent evamile esikhathini esizayo. ukudala izimbobo ezinecala elihle lapho ama-electron kanye nezimbobo kuhlangana khona njengoba ugesi udlula, ukukhulula amandla amaningi ngendlela yokukhanya kwemisebe.Ama-LED anezici ezihlukahlukene ze-luminescence angatholakala ngokusebenzisa izinto ezihlukahlukene ze-semiconductor. , okuluhlaza okotshani, okuwolintshi, okusawolintshi nokumhlophe.Umakhalekhukhwini ikakhulukazi USEBENZISA ukukhanya kwangemuva kwe-LED okumhlophe, kuyilapho ukukhanya kwe-LED engemuva esetshenziswa ku-LCD TV kungaba mhlophe, obomvu, oluhlaza okotshani noluhlaza okwesibhakabhaka.Emikhiqizweni ephezulu, ukukhanya kwangemuva kwe-LED okunemibala eminingi kungasetshenziswa ukuze kuthuthukiswe ukuvezwa kombala, okufana nemibala eyisithupha eyisisekelo yokukhanya kwe-LED. Inzuzo yokukhanyisa kwe-LED ukuthi ukujiya kuncane, cishe ku-5 cm, kanye ne-gamut yombala. ibanzi kakhulu, engafinyelela ku-105% we-NTSC color gamut.Ukukhanya okukhanyayo okumnyama kungancishiswa ku-0.05 lumens, okwenza isilinganiso sokungafani se-LCD TV sibe phezulu ku-10,000: 1. Ngesikhathi esifanayo, umthombo we-backlight we-LED unamanye amahora okuphila angu-100,000. Okwamanje, inkinga enkulu ikhawulela ukuthuthukiswa kokukhanya kwe-LED yizindleko, ngoba intengo iphakeme kakhulu kunomthombo wokukhanya wesibani esibandayo se-fluorescent, umthombo we-backlight we-LED ungavela kuphela ku-LCD TVS ephezulu phesheya.
Izinzuzo zomthombo we-backlight LED
1. Isikrini singenziwa sibe mncane.Uma sibheka amanye ama-LCDS, singabona ukuthi kunamashubhu amaningana e-CCFL e-filament ahleliwe.Ukukhanyisa kwangemuva, ngakolunye uhlangothi, kuyimpahla eyisicaba ekhipha ukukhanya, engadingi mishini eyengeziwe.
2. Umphumela ongcono wesithombe Isikrini esikhanyiselwe emuva se-CCFL sivamise ukuba nokukhanya okuhlukene phakathi nendawo ezungezile, kanti okunye kumhlophe uma isikrini simnyama bhuqe.
Amalambu e-CCFL e-fluorescent, njengamalambu e-fluorescent, aguga ngokuhamba kwesikhathi, ngakho izikrini zekhompuyutha eziphathwayo zendabuko zizophenduka zibe phuzi futhi zibe mnyama ngemva kweminyaka emibili noma emithathu, kuyilapho izikrini ezikhanyisa i-LED zizohlala isikhathi eside, okungenani izikhathi ezimbili noma ezintathu ubude.
Sonke siyazi ukuthi izibani ze-fluorescent zidinga i-voltage ephezulu ukuze ibhomuze umphunga we-mercury, ngakho-ke ukusetshenziswa kwamandla kwesikrini se-CCFL kukhulu, ngokuvamile ama-intshi angu-14 okusetshenziswa kwamandla angaphezu kwama-watts angu-20. Ama-Leds angama-semiconductors asebenza ku-voltage ephansi, alula ngesakhiwo, futhi zisebenzisa amandla amancane, okuzenza zilungele impilo yebhethri yekhompyutha ephathekayo.
5. Enobungani bemvelo ngokwengeziwe i-mercury ezibanini ze-CCFL izodala ukungcoliswa okukhulu kwemvelo, futhi kuzoba nzima kakhulu ukuyigaya kabusha ngokungenabungozi.
Isimiso sokusebenza sesibani se-CCFL esibandayo se-cathode fluorescent
Ukwakheka komzimba kwelambu elibandayo le-CCFL le-cathode fluorescent liwukuthi ingxube yegesi engasebenzi ye-Ne+Ar equkethe umhwamuko we-trace mercury (mg) ivalwa ngeshubhu lengilazi futhi into ekhanyayo iboshwe odongeni lwangaphakathi lwengilazi.Amashubhu e-CCFL e-cathode fluorescent ebandayo khipha ukukhanya ngokushaya impushana ye-fluorescent odongeni enokukhanya kwe-ultraviolet okujatshuliswa i-gaseous mercury ngokusebenzisa ama-electrode kuzo zombili iziphetho zeshubhu.Ubude begagasi bunqunywa izici zezinto ze-fluorescent.
Isici sesibani se-CCFL esibandayo se-cathode fluorescent
Umthombo wokukhanya we-CCFL i-liquid crystal TV EWUSEBENZISA ngokuvamile njengamanje, kungakhathaliseki ukuthi ubukeka kanjani kusukela ekunikezeni isimiso sokukhanya noma esakhiweni somzimba, bheka ngeshubhu lokukhanya kwasemini esilisebenzisa nsuku zonke eduze kakhulu.Lolu hlobo lomthombo wokukhanya lunezinzuzo zesakhiwo esilula, izinga lokushisa eliphansi likhuphuka phezu kwe-tube, ukukhanya okuphezulu phezu kwe-tube nokucubungula kalula kube yizimo ezihlukahlukene.Kodwa impilo yesevisi ifushane, iqukethe i-mercury, i-gambit yombala incane, kuphela ingafinyelela i-NTSC 70% ~ 80%.Kuzikrini ze-TV ezinosayizi omkhulu, amandla kagesi e-CCFL nokucutshungulwa kwamapayipi anwetshiwe kunzima.
Okokuqala, ikhanda elikhulu kunawo wonke ubude besikhathi sokuphila esifushane.Impilo yesevisi yokukhanya kwe-CCFL ngokuvamile ingamahora angu-15,000 kuya emahoreni angu-25,000, uma ukusetshenziswa isikhathi eside kwe-LCD (ikakhulukazi i-laptop LCD), lapho ukukhanya kwehla ngokusobala, lapho kusetshenziswa iminyaka engu-2-3. , isikrini se-LCD sizoba mnyama, siphuzi, lokhu ukuphila okufushane kwamaphutha e-CCFL okubangelwa.
Okwesibili, ikhawulela ukudlala kombala we-LCD.Iphikseli ngalinye ku-LCD lakhiwe ngamabhulokhi ombala angamanxande u-R, G no-B, futhi ukusebenza kombala kwe-LCD kuncike ngokuphelele ekusebenzeni kwemojuli yokukhanya kwangemuva kanye nefilimu yesihlungi sombala.Okuthathu okuyinhloko imibala yefilimu yokuhlunga iyafana nokukhanya okumhlophe okukhishwa i-CCFL (ukwakheka kwemibala emithathu eyinhloko), kodwa imojuli yokukhanya kwangemuva kwe-CCFL ayikwazi ukuhlangabezana nezidingo zedizayini, cishe kuphela u-70% wezinga le-NTSC.
Okwesithathu, isakhiwo siyinkimbinkimbi futhi ukufana kokukhishwa kokukhanya kumpofu.Ngoba isibani esibandayo se-cathode fluorescent asiwona umthombo wokukhanya kwendiza, ngakho-ke ukuze kuzuzwe ukukhanya okufanayo kokukhishwa kwe-backlight, i-backlight module ye-LCD idinga ukuhlonywa ngamadivaysi amaningi asizayo. njengepuleti le-diffuser, ipuleti likamhlahlandlela okhanyayo kanye nepuleti lokubonisa.
Okwesine, umthamo omkhulu, ukusetshenziswa kwamandla akulungile.Ivolumu ye-LCD ayikwazi ukuncishiswa ngokuqhubekayo ngoba ukukhanya kwe-CCFL kwangemuva kufanele kuqukathe ipuleti le-diffuser, ipuleti lokubonisa kanye nezinye izinto eziyinkimbinkimbi zamadivayisi okubona.Mayelana nokusetshenziswa kwamandla, ama-LCDS asebenzisa i-CCFL njengesibani sangemuva nawo akhona. akugculisi, njengoba i-LCDS engu-14-intshi idinga amandla angu-20W noma ngaphezulu.
Yiqiniso, eminyakeni emibili edlule abakhiqizi basekhaya nabangaphandle ngokubheka ukushiyeka kwe-CCFL yendabuko benza ukuthuthukiswa okuthile, kubonakala sengathi sekufinyelele izinga eliphezulu kakhulu, ukukhangisa kwabakhiqizi kuthiwa umlingo, kodwa lezi ntuthuko zilinganiselwe, futhi azikwazi ukuqeda ngokuphelele. i-CCFL backlight congenital technical defects.
Njengamanje, ukukhanya kwangemuva ikakhulukazi kuyishubhu le-CCFL, izindleko zingase zehle kancane, ubuchwepheshe bukhulile kakhulu. Ukukhanyisa kwe-LED kukhawulelwe emikhiqizweni emincane yesikrini efana nomakhalekhukhwini, i-MP3, i-MP4, njll. Ngemikhiqizo yesikrini emikhulu, i-. kuseyisiqondiso semizamo.Nokho, isindisa amandla kakhudlwana, okuyinzuzo yayo
Isikhathi sokuthumela: Jun-29-2019