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1. (KR1020080030063) METHOD OF DRIVING A DISCHARGE LAMP IN A PROJECTION SYSTEM, AND DRIVING UNIT

Office : Republic of Korea
Application Number: 1020087002251 Application Date: 28.01.2008
Publication Number: 1020080030063 Publication Date: 03.04.2008
Publication Kind : A
IPC:
H05B 41/36
H05B 41/288
H04N 5/74
H04N 9/31
H ELECTRICITY
05
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
B
ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
41
Circuit arrangements or apparatus for igniting or operating discharge lamps
14
Circuit arrangements
36
Controlling
H ELECTRICITY
05
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
B
ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
41
Circuit arrangements or apparatus for igniting or operating discharge lamps
14
Circuit arrangements
26
in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
28
using static converters
288
with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
5
Details of television systems
74
Projection arrangements for image reproduction, e.g. using eidophor
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
9
Details of colour television systems
12
Picture reproducers
31
Projection devices for colour picture display
CPC:
H05B 41/36
Applicants: KONINKLIJKE PHILIPS ELECTRONICS N.V.
Inventors: DEPPE CARSTEN
MUNTERS TOM
Priority Data: 2005 05105872 30.06.2005 EP
Title: (EN) METHOD OF DRIVING A DISCHARGE LAMP IN A PROJECTION SYSTEM, AND DRIVING UNIT
Abstract: front page image
(EN) The invention describes a method of driving a discharge lamp (1) in a projection system (10), wherein, in a feed-forward control process, system status data (SDL, SDF, SDV) comprising static information pertaining to the design of the projection system and/or dynamic information pertaining to the projection system and/or dynamic information pertaining to the lamp operation are obtained. Based on the system status data (SDL, SDF, SD V), a momentary target light waveshape (LWT, LW T') required by the projection system (10) and a waveshape correcting function are determined. Subsequently, the actual current (I) of the discharge lamp (1) is controlled regulated according to a momentary required waveshape (RW) which is determined based on the target light waveshape (LWT, LWT') and the waveshape correcting function. Moreover the invention describes an appropriate drivingunit (11) for driving a discharge lamp (1) and a projection system (10), comprising such a driving unit (11). ┬ęKIPO&WIPO 2008
Also published as:
EP1905280JP2008545154US20100134765CN101213884WO/2007/004101