Industry Patents
Patent: 7315139
Light Source Having More Than Three LEDs in Which the Color Points are Maintained Using a Three Channel Color Sensor
(Click image for PDF of full patent)
| Patent Number: |
7315139 |
| Title: |
Light Source Having More Than Three LEDs in Which the Color Points are Maintained Using a Three Channel Color Sensor |
| Abstract: |
A light source having first, second, and third component light sources
that are driven by first, second, and third primary drive circuits is
disclosed. Each primary drive circuit provides an average current to a
corresponding one of the component light sources. A photodetector and
processor generate three intensity signals representing the intensity of
light produced by each of the component light sources. A servo loop
adjusts the drive circuits so as to maintain the intensity signals at
corresponding target values. One of the compound light sources includes
first and second LEDs that are driven such that the currents through the
LEDs are maintained at a fixed ratio by a secondary drive circuit that is
connected to the third primary drive circuit. The magnitude of the
currents is determined by the third primary drive circuit.
|
| Country of Issue: |
US |
| First Named Inventor: |
Selvan, Boay, Kang |
| Assignee: |
Avago Technologies |
| Continuation or Divisional of: |
|
| International Classification: |
G05F 1/00 |
| US Classification: |
315/291 |
| Issue Date: |
01-01-2008 |
| Filing Date: |
11-30-2006 |
| Application : |
11/565540 |
| Notes: |
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| Link to Patent at freepatentsonline.com: |
7315139 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7315139 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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