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Invited Paper : UHP‐lamp systems for projection applications
Author(s) -
PollmannRetsch Jens,
Mönch Holger,
Baier Johannes,
Carpaij Mark,
Deppe Carsten,
Derra Günther,
Giese Hermann,
Hechtfischer Ulrich,
Körber Achim,
Krücken Thomas,
Mackens Uwe,
Niemann Ulrich,
Nörtemann FolkeCharlotte,
Pekarski Pavel,
Ritz Arnd,
Weichmann Ulrich
Publication year - 2007
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.2798817
Subject(s) - computer science , gas discharge lamp , luminance , projection (relational algebra) , computer graphics (images) , key (lock) , arc lamp , optics , electrical engineering , engineering , operating system , artificial intelligence , physics , algorithm , voltage
— Projection systems have found widespread use in conference rooms and other professional applications during the last decade and are now entering the home‐TV market with considerable pace. Projectors as small as about one liter are nowadays able to deliver a screen flux of several thousand lumens and are, with a system efficacy of more than 10 lm/W, the most‐efficient display system realized today. Because such highly efficient projectors employ microdisplays as light valves, short‐arc lamps are a key component in realizing these properties. The introduction of the UHP‐lamp system by Philips in 1995 can be identified as one of the key enablers for the commercial success of projection systems. The ultra‐high‐performance (UHP) lamp concept features outstanding arc luminance, a well‐suited spectrum, long life, and excellent flux maintenance. For the first time, it combines a very‐high‐pressure mercury‐discharge lamp having an extremely short and stable arc length with a regenerative chemical cycle that keeps the discharge walls free from blackening, leading to lifetimes of over 10,000 hours. In this review, the most important aspects of the UHP concept that enabled its success in the projection market are described, followed by a discussion of some recent additions to the UHP‐product portfolio.