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Cu to bn trong mn hnh plasma

Hnh 1

Hnh 2

Kh xenon hoc neon trong mn hnh plasma c cha trong hng trm ngn nhng cn phng nhgi l cc t bo, nm gia hai tm knh. Cc in cc di nm gia hai tm knh v kp gia cc t bo.

Cc in cc nm st tm knh pha sau c gi l cc in cc a ch (address electrode). Chng nmsong song vi nhau theo chiu ngang. Cc in cc nm st tm knh pha trc c gi l cc in cchin th (display electrode). Chng trong sut v nm theo chiu thng ng. Bao quang cc in cc hinth l mt lp vt liu in mi cch in. Nm gia cc t bo v in cc hin th cn c mt lp bov bng MgO. Cc in cc hin th v cc in cc a ch phi hp vi nhau to thnh mt li, mimt li l mt t bo.

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ion ho cht kh ca mt t bo no , b x l ca mn hnh s np in cho hai thanh in cctng ng giao nhau ti t bo . Thi gian np/phng in rt nhanh, hng ngn chu k trong khongvi phn trm giy. Dng in chy qua t bo no s lm cho t bo pht sng. Cc t bo c chopht sng lin tip nhau vi tc rt nhanh, to cho ta cm gic ton b mn hnh pht sng lin tc.

Khi hai in cc no c cp in, mt dng in s chy qua cht kh trong t bo ch hai incc giao nhau lm cht kh pht ra cc tia cc tm (tia UV). Tia cc tm ny s kch thch cht pht-phoph thnh ca cc t bo pht sng. Mi im nh trn mn hnh plasma bao gm ba t bo c lp cba mu khc nhau l , xanh lc v xanh thm (RGB). Ba t bo ny pht sng cng nhau. Mu sc caim nh l tng hp ca c ba mu. Bng cch thay i cng dng in chy qua mi t bo, ngita thay i c cng nh sng ca mu . Do vy s tng hp ca ba mu c bn vi cng khc nhau s to ra bt k mu no mong mun.

u im chnh ca cng ngh plasma l ch c th ch to nhng mn hnh cc ln vi cht liu ccmng. Phn ln mn hnh plasma u c ch to theo tiu chun kch thc 16:9 l kch thc ngycng c s dng rng ri trong cc h thng hometheatre v HDTV. Mt khc do mi im nh c

thp sng ring bit nn hnh nh rt sng, tuyt i phng v c th quan st c di mi gc .Tuy cht lng hnh nh cn cha c nh TV n hnh nhng mn hnh plasma cng p ng tt yucu ca hu ht mi ngi.

Nhc im ln nht ca mn hnh plasma l gi cn qu cao. Vi gi t 4.000$ n 30.000$, n hinnm ngoi kh nng ca nhiu ngi. Tuy vy, cng ngh ang pht trin tng ngy, chng ta tin rngchng bao lu na mn hnh plasma s h gi xung mc bng vi TV thng thng hin nay.

Ghi ch: Phn ln mn hnh plasma khng phi l TV m ch l thit b hin th do khng c phn thu vgii iu ch; gii m tn hiu truyn hnh. bin n thnh TV, bn cn lp thm mt anten v mt b

gii m, v d VCR.