Uhlelo Lokucubungula Umbala Kumabonakude E-LED
Amathelevishini e-LED (Light Emitting Diode) abe yindinganiso yegolide yamadivayisi okubonisa emakhaya nasezindaweni zomphakathi ngoba anikeza izithombe ezikhanyayo, mancane, asebenzisa amandla kahle, futhi angabizi kakhulu. Nakuba evame ukubizwa ngokuthi “ama-TV e-LED,” iningi lalawa madivayisi empeleni angama-TV e-LCD asebenzisa izibani zangemuva ze-LED. Ikhwalithi yesithombe esiyibonayo—ikakhulukazi ukunemba kombala, amazinga okuqhathanisa, kanye nokuhlelwa kwezigaba—ayinqunywa nje kuphela yiphaneli yokubonisa, kodwa futhi nayisistimu yokucubungula imibala esebenza ngemuva kwezigcawu. Lesi sihloko sixoxa ngendlela umbala ku-TV ye-LED ocutshungulwa ngayo kusukela emthonjeni wesignali ukuze ekugcineni uvele njengesithombe esicebile, semvelo.
1. Kusukela kuSignali Yevidiyo Kuya kuMbala Obonakalayo
Empeleni, ithelevishini ithola isignali yesithombe ngesimo sedijithali noma se-analog (isb., i-HDMI, ukusakazwa kwedijithali, noma imidiya yokusakaza). Lesi signali siphethe ulwazi lokukhanya (ukukhanya) kanye ne-chrominance (umbala), ngokuvamile kumafomethi afana ne-YCbCr noma i-RGB. Ngaphambi kokuba iboniswe esikrinini, le datha kumele icutshungulwe yiprosesa yesithombe (iprosesa yevidiyo). Le prosesa inesibopho sezinto eziningi: ukunciphisa umsindo, ukuthuthukisa ubukhali, ukuthuthukisa ukunyakaza, futhi okubaluleke kakhulu kulo mongo—ukuguqulwa kombala kanye nokumapha ukuze kuhambisane nezici zephaneli.
Emithonjeni eminingi yevidiyo, ulwazi lombala lufakwa ikhodi ngesampula encane, njengo-4:2:0, ukuze kusebenze kahle. Lokhu kusho ukuthi imininingwane yombala icindezelwa ngaphezu kwemininingwane yokukhanya. I-TV bese yenza isampula ephezulu ye-chroma ukuze "ibuyisele" ukucaca kombala, ivimbele isibonisi ukuthi singabonakali sinamaphikseli ngombhalo omncane noma imigqa emincane enemibala.
2. Iphaneli ye-LCD, Isibani Sangemuva se-LED, kanye Nendima Yezihlungi Zombala
Ama-TV e-LED ngokuvamile asebenzisa amaphaneli e-LCD (Liquid Crystal Display). Amaphaneli e-LCD awakhiphi ukukhanya ngokwawo, kodwa kunalokho alawula ukuthi kungakanani ukukhanya okuvela ekukhanyeni kwangemuva kwe-LED okuvumela ukuthi kudlule. Ukukhanya okuvela kulokhu kukhanya kwangemuva ngokuvamile kuba mhlophe (i-LED emhlophe) noma inhlanganisela ethile ye-spectrum. Ukukhanya bese kudlula kusihlungi sombala se-RGB (obomvu, oluhlaza okotshani, noluhlaza okwesibhakabhaka) ku-subpixel ngayinye. Ukuqina okuhlangene kwala ma-subpixel amathathu kudala izigidi zemibala.
Ikhwalithi yombala ithonywa kakhulu yilokhu:
– I-spectrum ye-LED yangemuva: Uma i-spectrum “ihlanza” kakhulu, ububanzi bemibala (i-gamut) bungatholakala.
– Ikhwalithi yesihlungi sombala: Isihlungi esihle siyakwazi ukukhiqiza ubomvu, uhlaza, kanye nohlaza okwesibhakabhaka okumsulwa.
– Ukusebenza kwephaneli: Kufaka phakathi amakhono okuvimba ukukhanya kwemibala emnyama kanye nokuqina kwe-engeli yokubuka.
Kuma-TV asezingeni eliphakathi kanye nasezingeni eliphezulu, abakhiqizi abaningi basebenzisa ubuchwepheshe obufana ne-Quantum Dot (QLED) ukwandisa ubumsulwa be-spectrum yokukhanya ukuze imibala ibe mnandi kakhulu futhi ububanzi be-gamut bube bubanzi.
3. Isikhala Sombala kanye neGamut
Uhlelo lokucubungula imibala lwe-TV kumele luvumelanise isibonisi nendinganiso ethile yesikhala sombala. Ezinye izindinganiso ezivamile yilezi:
– sRGB / Rec.709: Okuvamile ekusakazweni kwe-TV ye-HD kanye nokuqukethwe okuningi kwe-SDR (Standard Dynamic Range).
– I-DCI-P3: Isetshenziswa kabanzi kokuqukethwe kwe-cinema kanye nokuqukethwe kwe-HDR.
– Rec.2020: Ihloselwe okuqukethwe kwe-UHD/HDR okune-gamut ebanzi kakhulu, yize kungewona wonke ama-TV akwazi ukukufeza ngokugcwele.
Uma okuqukethwe kungena ku-Rec.709, i-TV imaka imibala ukuze iboniswe kahle kuphaneli. Kodwa-ke, uma okuqukethwe kuyi-HDR enethagethi ebanzi ye-gamut, i-TV kumele yenze imephu ye-gamut yombala ukuze ivumelanise ulwazi lombala namakhono ephaneli. Uma lokhu kumaka kungalungile, imibala ingabonakala igcwele ngokweqile noma ihlanzwe.
4. Ukujula Kwebhithi Nokuhlukaniswa Kombala
Imibala yedijithali imelelwa ngamanani ezinombolo. Uma ukujula kwe-bit kuphakeme, kulapho ukuhlelwa kwe-degree kushelela khona. Ama-TV anamuhla avame ukusekela:
– I-8-bit (cishe imibala eyizigidi ezingu-16,7) ye-SDR,
– I-10-bit (imibala engaphezu kwezigidigidi eziyi-1) ye-HDR,
– Kukhona futhi iphaneli ethi “8-bit + FRC” (Frame Rate Control) elilinganisa i-10-bit ngokudilika kwesikhathi.
Uhlelo lokucubungula imibala lusebenza futhi ekunciphiseni ukuhlukaniswa kombala, imigqa ye-gradient ebonakalayo esibhakabhakeni noma izithunzi ezithambile. Izici ezifana nokufiphala kanye nokushelela kwe-gradation zingasiza ekudaleni ukushintsha kombala okubushelelezi.
5. Ibhalansi Emhlophe, Izinga Lokushisa Lombala, kanye neGamma
Ukunemba kombala akukhona nje kuphela ngokubomvu-oluhlaza okwesibhakabhaka, kodwa futhi nangokumhlophe okulungile. Okumhlophe okuluhlaza okwesibhakabhaka kakhulu kwenza isithombe sibonakale sipholile, kuyilapho okumhlophe okuphuzi kakhulu kwenza sifudumale. Ama-TV ngokuvamile anikeza izindlela zokushisa kombala njengokuthi "Kupholile," "Okujwayelekile," kanye "Nokufudumala." Ngokuzenzakalelayo, ekubukeni ama-movie nokunye okuqukethwe ngokunembile, inhloso evamile yi-D65 (cishe i-6500K).
Ngaphezu kwalokho, kunepharamitha ebalulekile ebizwa ngokuthi i-gamma (ye-SDR) noma i-transfer curve, njenge-PQ (ST.2084) kanye ne-HLG (ye-HDR). I-Gamma ilawula indlela ama-midtone aboniswa ngayo. Uma i-gamma iphakeme kakhulu, isithombe sibonakala simnyama futhi siphambene kakhulu; uma siphansi kakhulu, isithombe sibonakala sihlanziwe.
Uhlelo lokucubungula umbala luzohlanganisa izilungiselelo zokulinganisela okumhlophe, i-gamma, kanye nokuphathwa kombala ukuqinisekisa ukuthi umphumela wokugcina uhlangabezana nezindinganiso zomsebenzisi noma izintandokazi.
6. Uhlelo Lokuphathwa Kombala (i-CMS)
Ama-TV amaningi anamuhla ahlinzeka nge-CMS, okuyisistimu yokulungisa amapharamitha ombala ngokuningiliziwe, ngokuvamile afaka:
– Umbala (umbala),
- Ukugcwala,
– Ukukhanya (ukukhanya kombala).
I-CMS ivumela ukulungiswa kwemibala eyinhloko (RGB) neyesibili (CMY) ukuze kufinyelelwe ezindinganisweni zokubhekisela ezilinganisweni ezilinganiselwe. Ekulinganisweni kobungcweti, ochwepheshe basebenzisa i-colorimeter noma i-spectroradiometer ukukala umphumela wephaneli, bese belungisa i-CMS kanye nebhalansi emhlophe ukuze kufezwe iphutha eliphansi lombala (i-Delta E).
7. Ukucutshungulwa kwe-HDR kanye nokuMepha ithoni
I-HDR (High Dynamic Range) yandisa ububanzi bokukhanya nemibala, okwenza imininingwane yokukhanya nemnyama ibonakale kakhulu. Kodwa-ke, akuwona wonke ama-TV anamakhono afanayo okukhanya okuphezulu. Ngakho-ke, ama-TV enza imephu yethoni: ukumaka isignali ye-HDR, mhlawumbe eyenzelwe ama-nit ayi-1000–4000 (noma ngaphezulu), ukuze ifane namakhono ephaneli, njengama-nit ayi-500–1000.
Ukumapha kwethoni kuhlobene kakhulu nombala, ngoba ku-HDR, ukugcwala kombala kuvame ukushintsha njengoba ukukhanya kukhuphuka. Yingakho izinhlelo zokucubungula umbala ze-HDR kumele zigcine imibala ebukeka njengeyemvelo ezindaweni ezikhanyayo, zivimbele ukuthi ingagezwa noma "ishiswe."
Amafomethi ajwayelekile e-HDR afaka:
– I-HDR10 (i-metadata engaguquki),
– I-HDR10+ kanye ne-Dolby Vision (i-metadata enamandla),
– I-HLG (evame ukusetshenziswa ekusakazeni).
I-metadata enamandla ivumela i-TV ukuthi ilungise imephu yethoni ngesigcawu ngasinye noma ngohlaka ngalunye ukuze imibala nemininingwane kugcinwe kangcono.
8. Ukufiphala Kwendawo kanye Nomphumela Wakho Embaleni
Ama-TV e-LED anokufiphaza kwendawo (ikakhulukazi i-Full Array Local Dimming/FALD) angafiphaza izindawo ezithile zokukhanya kwangemuva ukuze kuthuthukiswe ukuphambana. Kodwa-ke, lolu hlelo luthinta nokubona umbala. Uma i-algorithm yokufiphaza yendawo inamandla kakhulu, imininingwane yombala ezindaweni ezimnyama ingalahleka noma ukuqhakaza kungenzeka (ukukhanya "kuvuza" eduze kwezinto ezikhanyayo). Ngakho-ke, ukucubungula umbala nokulawula ukukhanya kwangemuva kumele kusebenze ngokuvumelana ukuze kugcinwe imibala ecebile emthunzini ngaphandle kokulahla ukuphambana.
9. Imodi Yesithombe Nokunambitha Kombala
Ama-TV amaningi anikeza izindlela ezifana ne-Vivid, Standard, Cinema, noma i-Filmmaker Mode. Imodi ecacile ivame ukwandisa ukugcwala, ukugqama, kanye nokucaca ukuze ikhange ezindaweni zokuthengisa ezikhanya kakhulu, kodwa ivame ukudela ukunemba kombala. Imodi ye-Cinema noma i-Filmmaker ivame ukuba seduze nezindinganiso zokukhiqiza amafilimu futhi ilethe imibala yemvelo kakhulu.
Ngaphezu kwalokho, amanye ama-TV anezici ezengeziwe ezifana nokuthi "Umbala Obukhoma," "I-Color Enhancer," noma "I-Dynamic Contrast," ezilungisa imibala ngendlela evumelana nezimo. Lezi zici zingaba usizo kokunye okuqukethwe, kodwa kubasebenzisi abagxile ekunembeni, ngokuvamile kungcono bangazinaki.
10. Isiphetho
Uhlelo lokucubungula imibala kuthelevishini ye-LED luwuchungechunge oluyinkimbinkimbi lwezinqubo eziguqula idatha yevidiyo ibe ukubonisa kombala okukhululekile, okunembile, nokukhangayo. Kusukela ekuguqulweni kwefomethi yombala, ukumepha kwe-gamut, izilungiselelo zebhalansi emhlophe, i-gamma, i-CMS, kuya ekucubungulweni kwe-HDR kanye nokumepha kwethoni—konke kudlala indima ekunqumeni ikhwalithi yokubuka. Umphumela wokugcina uphinde uthonywe amakhono angokwenyama edivayisi: i-backlight spectrum, ikhwalithi yesihlungi sombala, ukujula kwe-panel bit, kanye ne-algorithm yokufiphaza yendawo.
Ukuqonda ukuthi ukucubungula imibala kusebenza kanjani kusiza abasebenzisi ukuthi bakhethe imodi yesithombe efanele, benze izilungiselelo ezinolwazi oluthe xaxa, noma balinganisele ukuze bafinyelele imibala eseduze nereferensi. Ngale ndlela, ama-TV e-LED awabonisi nje kuphela izithombe "ezikhanyayo", kodwa futhi nemibala egqamile, elinganiselayo ehambisana nenhloso yomdali wokuqukethwe.
