Patent · US Active

Method for generating mixed light colors

US8115416B2 · kind B2 · utility

2Cited by

2References

12Claims

0Family size

Assignee

Diehl Aerospace GmbH · DE

Inventors

Eckhard Steffen · Burgthann, DE
Till Kiewning · Winkelhaid, DE

Key dates

Filing date	Nov 7, 2008
Grant date	Feb 14, 2012
Priority date	—
Expiry date	Apr 22, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH05B45/325
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for avoiding physiological phenomena such as color separation or stroboscopic effects that occur under boundary conditions in the case of intermittent feeding in particular of light-emitting diodes, for additive superposition to form color-locus-variable mixed light, whereby the emission brightness that can be represented by a periodic duty ratio of a pulse-time-modulated constant current feeding—preferably within the respective period—is realized by changeover to other or between different constant current intensities in such a way that a brightness equivalent, namely once again the current-time integral of the predetermined, brightness-determining duty ratio, arises in the current area sum, which now preferably no longer exhibits gaps over the period.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.