US Patent No. 10,219,346

DYNAMIC COLOR SHADOWS FOR DECORATIVE WHITE LIGHTING


Patent No. 10,219,346
Issue Date February 26, 2019
Title Dynamic Color Shadows For Decorative White Lighting
Inventorship Ties Van Bommel, Eindhoven (NL)
Rifat Ata Mustafa Hikmet, Eindhoven (NL)
Assignee PHILIPS LIGHTING HOLDING B.V., Eindhoven (NL)

Claim of US Patent No. 10,219,346

1. A lighting device for illuminating an object, the lighting device comprising:a light source arrangement comprising multiple light sources of different colors configured to emit a respective light beam, wherein a total light emitted by said light source arrangement produces a white light beam;
a contrast producing element comprising an optically transmissive portion and a second portion being at least partly optically blocking, said contrast producing element being arranged to receive white light from said light source arrangement, and to create shadows on the object;
a control unit configured to control said light source arrangement to modulate a spatial light spectral distribution of the total light emitted by said light source arrangement at said contrast producing element; and
a selector for switching said lighting device between a first mode in which said control unit is inactive and said lighting device emits white light, and a second mode in which said control unit is active, and
wherein in the second mode said lighting device is arranged to create dynamically changing color shadows on the object.