UHP lamps for projection

Moench, Holger; Derra, Guenther; Fischer, Ernst; Riederer, X.

doi:10.1889/1.1827849

Cited by 7 publications

(8 citation statements)

References 5 publications

(6 reference statements)

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“…(2) for a given étendue E (in mm 2 -sr) and arc length d (in mm). 8,10,16 Clearly, a short arc is very important, especially for low-étendue projection systems, i.e., systems with small display sizes. The UHP technology enables arc lengths as small as 0.7 mm with good lifetimes.…”

Section: Collection Efficiencymentioning

confidence: 99%

“…Such arc instabilities affect the light distributi on on th e dis play and therefore cause disturbing brightness variations on the screen. 7,8 Optical averaging of the collected flux (by lens-array or rod-type integrators) usually is a good measure against the visibility of arc instabilities. However, for display diagonals smaller than 1 in., arc instabilities still become visible as fluctuations of total image brightness.…”

Section: Electronic Drivermentioning

confidence: 99%

“…Following its launch, the UHP-lamp system has been improved with a fast innovation rate. [4][5][6][7][8][9][10][11][12][13][14] Many important new technology improvements have been realized: burner designs for higher lamp power, advanced ignition systems, miniaturized electronic drivers, and innovative reflector concepts. These achievements enabled the impressive increase of light output from the projector, a remarkable reduction of projector size, and an even higher optical efficiency of projection systems during the last several years (see Fig.…”

Section: Introductionmentioning

confidence: 99%

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Invited Paper: UHP‐lamp systems for projection applications

Pollmann‐Retsch¹,

Mönch²,

Baier³

et al. 2007

J Soc Info Display

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Abstract— 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.

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Section: Collection Efficiencymentioning

confidence: 99%

Section: Electronic Drivermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Invited Paper: UHP‐lamp systems for projection applications

Pollmann‐Retsch¹,

Mönch²,

Baier³

et al. 2007

J Soc Info Display

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“…UHP lamps are the standard light source for projection applications 1,2,3,4 . Essential features of UHP lamps are a mercury pressure above 200 bar for a good spectrum and high burning voltage, and the implementation of a chemical cycle which keeps the wall clear over thousands of hours lamp life.…”

Section: Introductionmentioning

confidence: 99%

26.2: Controlled Electrodes in UHP Lamps

Moench

Deppe

Hechtfischer

et al. 2004

Symp Digest of Tech Papers

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The electrodes of short arc UHP lamps bear the brunt to combine high power densities with long life. This conflict can be resolved by a proper electrical operation of the lamp. Special drive schemes for Philips UHP lamps provide a stable arc attachment and a superior electrode durability. In this paper, we present electrode performance measurements under various conditions and discuss the underlying physical effects.

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“…Short arc lamps are a key component for projection systems to achieve highest efficiency for small display sizes. Looking back, the introduction of the UHP lamp concept by Philips represents a significant technological breakthrough and a commercial boost for the projection market 1,2,3,4 . Today, UHP lamps are the standard for most commercially available front and rear projectors.…”

Section: Introductionmentioning

confidence: 99%