Title:
LEDユニットの光出力を制御するフィードバック制御システム
Document Type and Number:
Japanese Patent JP2008521237
Kind Code:
A
Abstract:
The present invention relates to a control system (13) and method for controlling the light output of an emitting unit (11) having at least one LED (15) and emitting light of at least one color. The control system (13) comprises a feedback based on a detection unit (19) detecting the light output of the emitting unit (11), a detection pulse generator (27), a suppression unit (23) suppressing environmental light interferences in detected light, and a control unit (21) for controlling the light output of the emitting unit on basis of a comparison between a reference signal representing a desired light output of the emitting unit and an output signal of the suppression unit. The detection pulse generator (27) generates detection pulses a-periodically. Thus, an a-periodicity is introduced into the feedback processing of the light output. This provides a possibility by means of conventional suppression algorithms to eliminate or reduce interfering environmental light, particularly pulsed light.
Inventors:
Kurt, Ralph
Meyer, Eduard Ye
Meyer, Eduard Ye
Application Number:
JP2007542398A
Publication Date:
June 19, 2008
Filing Date:
November 14, 2005
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H05B44/00; H01L33/00; H05B37/02; G02F1/133
Domestic Patent References:
| JP2004517445A | 2004-06-10 | |||
| JP2004170721A | 2004-06-17 | |||
| JP2004077585A | 2004-03-11 |
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito
Koichi Matsumoto
Shinsuke Onuki
Tadashige Ito
Koichi Matsumoto