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US 2006/0038803 A1Published application
LED control method and structure therefor
AssigneeSemiconductor Components Industries, LLC
InventorsRoger Miller, Robert Houf, Ronald Vinsant
Life of this patent
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Abstract
In one embodiment, a plurality of LEDs are connected in series. A substantially constant current is applied to the LEDs. An amount of the current that flows through each LED is selectively controlled to provide light of a desired color and intensity.
Claims20
A method of forming an LED controller comprising:
- configuring the LED controller to form an LED drive current for a plurality of series connected LEDs and to maintain the LED drive current substantially constant;
- and
- configuring the LED controller to selectively control an amount of the LED drive current that passes through any one LED of the plurality of series connected LEDs separately from other LEDs of the plurality of series connected LEDs.
An LED controller comprising:
- a current controller operably coupled to receive a current sense signal that is representative of a drive current through a plurality of series connected LEDs and to responsively maintain the drive current substantially constant;
- and
- a plurality of switches configured to receive LED control signals and selectively control an amount of the drive current that flows through each LED of the plurality of series connected LEDs.
A method of controlling LEDs comprising:
- coupling a plurality of LEDs in series;
- applying a drive current to the plurality of LEDs and maintaining the drive current substantially constant;
- and
- selectively controlling an amount of the drive current that flows through each LED of the plurality of LEDs.
1 more element
Dependencies are inferred from the claim text.