Patent · US Active

Color-controlled illumination device

US8022632B2 · kind B2 · utility

25Cited by

7References

10Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Volkmar Schulz · Schwarzenbruck, DE
Eduard Johannes Meijer · Eindhoven, NL

Key dates

Filing date	Jan 10, 2007
Grant date	Sep 20, 2011
Priority date	—
Expiry date	Mar 16, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH05B45/22
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The invention relates to a color-controlled illumination device (1) with a number of light emitters, for example LEDs (L1, L2, L3, L4), of different primary colors. Photosensors (D1, D2, D3) consisting of a photodiode (20) covered with different dielectric filter layers (21) measure the light output of the light emitters (L1, L2, L3, L4) with distinct oscillating sensitivity curves that extend over the whole relevant spectral range. In a control unit (14), the actual color point of the illumination device (1) is calculated and the emissions of the light emitters (L1, L2, L3, L4) are individually adapted in order to match a target color point ((X,Y,Z)target) given with e.g. CIE tri-stimulus values.

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