Schermo al plasma: differenze tra le versioni

Versione delle 11:24, 23 gen 2007

Versione delle 23:12, 28 gen 2007

Riga 10:

Gli svantaggi più grandi di questa tecnologia sono dati dal prezzo e dal progressivo degrado dell'immagine; soprattutto la persistenza di immagini statiche tende a creare fastidiose ombreggiature e zone scure, che, nei casi più gravi, si notano anche a schermo spento, il degrado dell'immagine è conseguente alla progressiva alterazione cromatica della superficie interna della singola cella contenente il gas, e dal progressivo ridursi della sua luminosità, analogalmente come avviene nelle lampade al neon.

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Gli schermi al plasma vennero inventati nell' [[Università di Illinos a Urbana-Champaign]] da [[Donald Bitzer|Donald L. Bitzer]], H. Gene Slottow, e dal laureato Robert Willson nel 1964 pre la [[PLATO|PLATO Computer System]]. L'originale schermo monocromatomonocromatico (generalmente arancione o verde, ma qualche volta anche giallo) fu felicemente molto popolare agli inizi del '70, perchè lo schermo era robusto e rispondeva alle prime necessità di memoria circuitry to refresh the images. ASegui longun periodlungo ofperiodo salesdi declinecalo followeddelle invendite theche latefu 1970sseguito, asalla fine degli anni '70, dalla----dei monitor CRT a"semiconductor memory" madeche CRTrisultarono displayspiù cheapereconomici thandei plasmamonitor displaysal plasma. NonethelessComunque, plasma'sla relativelyrelativamente largegrande screentaglia sizedei andmonitor thinal profileplasma madee thela displaysloro attractivesottigliezza ne fanno un'attrattiva forper "high-profile placement such as lobbies and stock exchanges.

InNel 1983, la [[IBM]] introducedintrodusse aun display da 19-inch pollici monocromatico "orange-on-black" monochrome(arancio displaysu nero)(model 3290 'information panel') whichche wasera ablein togrado showdi fourillustrare simultaneoussimultaneamente quattro sessioni su terminale [[IBM 3270]] del tipo "macchine virtuali" (virtual machine) (VM) terminal sessions. That factory was transferred in 1987 to startup company [http://www.plasmatvscience.org/plasmatv-history1.html Plasmaco], which Dr. [[Larry F. Weber]], one of Dr. Bitzer's students, founded with [[Stephen Globus]], and James Kehoe, who was the IBM plant manager. In 1992, [[Fujitsu]] introduced the world's first 21-inch full-color display. It was a hybrid, based upon the plasma display created at the [[University of Illinois at Urbana-Champaign]] and [[NHK]] [[STRL]], achieving superior brightness. In 1996, [[Matsushita]] Electrical Industries (Panasonic) purchased Plasmaco, its color AC technology, and its American factory. In 1997, [[Pioneer Corporation|Pioneer]] started selling the first plasma television to the public.

In 1983, [[IBM]] introduced a 19-inch orange-on-black monochrome display (model 3290 'information panel') which was able to show four simultaneous [[IBM 3270]] virtual machine (VM) terminal sessions. That factory was transferred in 1987 to startup company [http://www.plasmatvscience.org/plasmatv-history1.html Plasmaco], which Dr. [[Larry F. Weber]], one of Dr. Bitzer's students, founded with [[Stephen Globus]], and James Kehoe, who was the IBM plant manager. In 1992, [[Fujitsu]] introduced the world's first 21-inch full-color display. It was a hybrid, based upon the plasma display created at the [[University of Illinois at Urbana-Champaign]] and [[NHK]] [[STRL]], achieving superior brightness. In 1996, [[Matsushita]] Electrical Industries (Panasonic) purchased Plasmaco, its color AC technology, and its American factory. In 1997, [[Pioneer Corporation|Pioneer]] started selling the first plasma television to the public.

Screen sizes have increased since the 21-inch display in 1992. The largest plasma video display in the world was shown at the ([[Consumer Electronics Show]]) in Las Vegas, Nevada, U.S.A., in 2006, measuring 103 inches and was made by [[Matsushita]].