Industry Patents

Patent: 7515128

Methods and Apparatus for Providing Luminance Compensation

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Patent Number:	7515128
Title:	Methods and Apparatus for Providing Luminance Compensation
Abstract:	Methods and apparatus for generating two or more different colors or color temperatures of light over a significant range of different saturations or different color temperatures, in which luminance compensation is provided. In one example, generated light is compensated, at least in part, for the "Helmholtz-Kohlrausch" (HK) effect, which models the perception of different brightnesses for different colors or color temperatures, notwithstanding identical luminances. In another example, lighting apparatus including one or more LEDs to generate two or more different colors or color temperatures of light are configured to provide luminance compensation so as to mitigate, at least in part, the HK effect.
Country of Issue:	US
First Named Inventor:	Dowling
Assignee:	Philips SSL
Continuation or Divisional of:
International Classification:	G09G 3/32
US Classification:	345/83
Issue Date:	04-07-2009
Filing Date:	12-20-2005
Application :	11/312030
Notes:
Link to Patent at freepatentsonline.com:	7515128 at Freepatentsonline
Link to World Patent Family¹:	World Patent Family at European Patent Office
Link to Google Patents¹:	7515128 at Google Patents

1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.

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