Apparatus and method for controlling colour and colour...

Details Apparatus and method for controlling colour and colour... Apparatus and method for controlling colour and colour...

2008-09-09

2008-09-09

Vu, David H (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S169300, C315S18500S, C315S192000, C315S193000

Reexamination Certificate

active

11285980

ABSTRACT:
The present invention provides a method and apparatus for controlling the correlated colour temperature (CCT) or colour of light produced by an array of light-emitting elements by providing multiple selectable paths for the flow of drive current. The apparatus includes a primary path comprising primary light-emitting elements, and one or more secondary paths comprising secondary light-emitting elements that are used for compensation or correction of the colour of light emitted by the primary light-emitting elements. A plurality of control means, for example switches are used to direct current through particular paths. During operation, the drive current primarily flows through the primary light-emitting elements and is redirected, periodically for example, to a secondary path comprising light-emitting elements of a particular colour that is desired in addition to the colour produced by the primary light-emitting elements.

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