Light emitting device

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United States of America Patent

PATENT NO 8344632
APP PUB NO 20110140618A1
SERIAL NO

12637769

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A light emitting device including a voltage source, a light emitting unit, and a current source is provided. The voltage source is coupled to the light emitting unit for supplying a voltage. The light emitting unit includes n light emitting diodes (LEDs) and n current control switches, wherein n is greater than or equal to 3. The LEDs are respectively coupled to the current control switches in series. The current control switches are turned on and off according to a current threshold. The current source is coupled to the light emitting unit for supplying a fixed current. Thereby, the luminous intensity of the light emitting device remains stable even when some of the LEDs fail.

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Patent Owner(s)

  • SILICON TOUCH TECHNOLOGY INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Wang, Jia-Shyang Hsinchu, TW 57 39

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