The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 2008
Filed:
Nov. 30, 2006
Maniam Selvan, Pulau Penang, MY;
Yoke Peng Boay, Gelugor Penang, MY;
Hooi Choo Kang, Georgetown Penang, MY;
Maniam Selvan, Pulau Penang, MY;
Yoke Peng Boay, Gelugor Penang, MY;
Hooi Choo Kang, Georgetown Penang, MY;
Avago Technologis ECBU IP (Singapore) Pte Ltd, Singapore, SG;
Abstract
A light source having first, second, and third component light sources that are driven by first, second, and third primary drive circuits is disclosed. Each primary drive circuit provides an average current to a corresponding one of the component light sources. A photodetector and processor generate three intensity signals representing the intensity of light produced by each of the component light sources. A servo loop adjusts the drive circuits so as to maintain the intensity signals at corresponding target values. One of the compound light sources includes first and second LEDs that are driven such that the currents through the LEDs are maintained at a fixed ratio by a secondary drive circuit that is connected to the third primary drive circuit. The magnitude of the currents is determined by the third primary drive circuit.