Berlin 2001 – scientific programme

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P: Plasmaphysik

P II: HV II

P II.1: Invited Talk

Monday, April 2, 2001, 15:30–16:00, 2053

High Pressure Gas Discharge Lamps for the TV of the Future — •Holger Mönch —

Large screen TV (>1m diagonal) is becoming reality. Several technologies compete for this market: "Jumbo-CRTs", plasma displays, tiled LCD and last but not least projection. It is the charming feature of projection to create large pictures by a small, lightweight and finally cheap device. Basically the same technology can be used for professional presentation and home TV. The need for lower costs drives further size reduction of projection displays and integration of driver electronics. New technologies like LCoS (Liquid Crystal on Silicon) will allow mega-pixel resolution in a single device of less than one inch. This development on the display side is only possible if accompanied by a similar progress in light sources. Small displays with sophisticated optics require light sources with a luminance well above the brightness of the sun (1Gcd). Philips invented the UHP lamp, a high-pressure mercury lamp with a regenerative halogen cycle. Thanks to it highest brightness, good colour and up to 20000 hours life the UHP lamp is today used in more than 95% of all projection applications. Further improvements require detailed understanding of the discharge plasma and the heat transfer to quartz bulb and tungsten electrodes. Temperature gradients up to 100000K/mm in front of the electrode and strong material transports have to be controlled. This talk will span the bridge from projection application requirements to actual plasma lamp research.