Xaver Riederer

52.1: Invited Paper: New Developments in Projection Light Sources—Shorter Arcs and Miniaturisation

New developments of UHP lamps with higher power and shorter arcs (even below 1mm) fulfill the optical demands of future projectors and novel displays. In addition a new technology is presented which leads to a reduction of the lamp ignition voltage from 20kV to 5kV. This enables a further step in system size reduction.

UHP lamps for projection

UHP lamps are now standard equipment in highly efficient projection systems. These systems are moving toward smaller displays, brighter screens, and ultra-compactness. Consequently, a range of UHP lamps has been developed to fulfil these ever-increasing demands. This paper describes the basic principles of UHP lamps and reviews the major achievements made over the last several years, which include reduction in arc size, arc stabilization, and ignition voltage reduction.

9.1: Arc Stabilisation for Short Arc Projection Lamps

UHP-lamps are standard for high efficient projection systems. All short arc lamps show arc instabilities. Optical integrators can successfully suppress visual effects but they are of limited use for small displays. A new technology is presented here which stabilises the lamp arc directly and keeps the good maintenance of the lamp.