The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 2012
Filed:
Dec. 05, 2007
Roger Peter Anna Delnoij, Eindhoven, NL;
Roger Peter Anna Delnoij, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An illumination system (), comprising:—four lamps (A,B,C,D);—four lamp drivers (A,B,C,D) capable of driving their corresponding lamps with respective dim factors (ξ);—a common controller () for controlling the dim factors of the respective lamps. The controller is responsive to an input signal indicating a target color point (T) having target chromaticity coordinates (x, y) and target brightness (B). The controller sets the dim factor (ξ) of one lamp to be equal to 1, and calculates an optimum solution for the other three dim factors as a function of the target chromaticity coordinates (x, y), for the maximum allowed value of the luminance (Y) for which 0≦ξ≦1 applies for each of said dim factors (ξ).