Industry Patents
Patent: 6737814
Enhanced Trim Resolution Voltage-Controlled Dimming LED Driver
(Click image for PDF of full patent)
| Patent Number: |
6737814 |
| Title: |
Enhanced Trim Resolution Voltage-Controlled Dimming LED Driver |
| Abstract: |
Illumination sources, each including at least one light emitting diode, are
connected either in series or in parallel by a switching circuit,
depending upon an applied input voltage. The switching circuit switches
the illumination sources from series- to parallel-connection, or vice
versa, when the applied input voltage crosses a threshold value in
traversing the operating range of applied input voltages. Because the
light emitting diodes within the illumination sources are switched from
series to parallel connection at a defined kickover point, the
voltage-luminance characteristic changes on opposite sides of the kickover
point. The resulting overall voltage-luminance characteristic has greater
variability in luminance across the entire operating range of applied
input voltages, and luminance-variance is not limited to only a portion of
the operating range. Greater trim resolution for voltage-controlled
dimming of the light emitting diodes is therefore provided, with industry
standard luminances being achieved at appropriate applied input voltages.
|
| Country of Issue: |
US |
| First Named Inventor: |
Guthrie, Coley |
| Assignee: |
Aerospace Optics |
| Continuation or Divisional of: |
6323598 |
| International Classification: |
H05B 37/00 |
| US Classification: |
315/200A |
| Issue Date: |
05-18-2004 |
| Filing Date: |
09-07-2001 |
| Application : |
09/949138 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
6737814 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
6737814 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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