Interference-resistant compensation for illumination devices using multiple series of measurement intervals
USRE48298E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | May 17, 2018 |
| Grant date | Nov 3, 2020 |
| Priority date | — |
| Expiry date | May 17, 2038 |
Classification
- Technology area (CPC —)General
Abstract
A method and illumination device are provided for interference-resistant compensation in light emitting diode (LED) illumination devices. In one embodiment, the method includes bringing to a level insufficient to produce illumination the respective drive current of all except one of multiple emission LED elements for the duration of a first measurement interval and a later-occurring second measurement interval. The first and second measurement intervals are within respective first and second series of measurement intervals interspersed with periods of illumination, and the first and second series of measurement intervals are separated by respective first and second offsets from a timing reference. An embodiment of an illumination device includes multiple emission LED elements, one or more photodetectors, and a lamp control circuit, where the lamp control circuit is adapted to perform steps of the method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.