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Lighting devices including current shunting responsive to LED node and related method

A light-emitting device and a technology of the device, applied in the field of light-emitting, capable of solving problems such as significant changes in color points of LED light-emitting systems

Inactive Publication Date: 2014-10-01
CREE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even when merging is utilized, LED lighting systems may still experience significant variation in color point from one system to the next

Method used

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  • Lighting devices including current shunting responsive to LED node and related method
  • Lighting devices including current shunting responsive to LED node and related method
  • Lighting devices including current shunting responsive to LED node and related method

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Embodiment Construction

[0051] Embodiments of the invention now will be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout.

[0052] In solid state lighting devices, a current is driven through an array of several lighting device LEDs (eg, light emitting diodes) to provide light output. Not only that, but the current through the different colored LEDs can be adjusted to provide color balance so that the combined / mixed output of the LEDs can appear white. Pending and commonly assigned U.S. Patent Application No. 12 / 987,485 (filed January 10, 2011, titled "Systems A...

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PUM

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Abstract

A solid state lighting device may include a power supply and a light emitting device electrically coupled between the power supply and a reference node, with the light emitting device defining a node. A control element may be provided in a current shunting path electrically coupled in parallel with the light emitting device between the power supply and the reference node, with the control element being configured to control a voltage drop across the current shunting path responsive to an electrical signal from the node of the light emitting device. Related methods are also discussed.

Description

technical field [0001] This invention relates to light emission, and more particularly to solid state light emission. Background technique [0002] Solid state lighting devices are used in many lighting applications. For example, solid state lighting panels including arrays of solid state lighting devices have been used as direct lighting sources, such as in architectural and / or accent lighting. Solid state lighting devices can include, for example, packaged lighting devices that include one or more light emitting diodes (LEDs). Typically inorganic LEDs include semiconductor layers forming a p-n junction. Organic LEDs (OLEDs), which include an organic light emitting layer, are another type of solid state light emitting device. Typically, solid-state light-emitting devices generate light by recombining electron carriers, ie, electrons and holes, in a light-emitting layer or region. [0003] Solid state light emitting panels are also commonly used as backlights for small l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L29/66H05B44/00
CPCH05B33/0815H05B33/083H05B45/48H05B45/37H05B45/38
Inventor J·P·乔鲍特
Owner CREE INC