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Illumination system comprising LED array

A technology of light-emitting diodes and lighting systems, applied in the field of lighting systems, can solve the problems of high cost, time-consuming efficiency, etc.

Inactive Publication Date: 2004-12-01
SIGNIFY HOLDING B V
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This combined process is costly, time consuming and inefficient

Method used

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  • Illumination system comprising LED array
  • Illumination system comprising LED array
  • Illumination system comprising LED array

Examples

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Embodiment Construction

[0026] image 3 An arrangement 100 of light emitting diodes for a lighting system according to an embodiment of the invention is shown. This lighting system includes a large number of conductive branches. Each branch includes diodes connected in series. A group of corresponding light-emitting diodes of all branches is defined as a unit. image 3 The arrangement shown in shows a cascade of LED units 101(a), 101(b) to 101(n). It is to be noted that any number of cells may be formed according to various embodiments of the present invention.

[0027] Each cell 101 of the arrangement 100 includes a first light emitting diode (such as light emitting diode 110 ) of branch 102 and a first light emitting diode of branch 103 (such as light emitting diode 111 ). Each branch containing LEDs is de novo connected in parallel via resistors (say resistors 105 and 106). The resistors preferably have the same resistance value to ensure that each branch receives the same current.

[0028] ...

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PUM

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Abstract

A lighting system comprising a plurality of light-emitting diodes and a current driver for driving current through a plurality of parallel disposed, electrically conductive branches, wherein the branches comprise at least one cell. In each cell, each branch has a light-emitting diode with an anode terminal and a cathode terminal. The anode terminal of each light-emitting diode is coupled to the cathode terminal of a light-emitting diode of an adjacent branch via a shunt. The shunt further comprises a light-emitting diode. In each cell, each light-emitting diode may have a different forward voltage characteristic, while still insuring that all of the light-emitting diodes in the arrangement have the same brightness. Upon failure of one light-emitting diode, the remaining light-emitting diodes in the lighting system are not extinguished.

Description

technical field [0001] The present invention relates generally to lighting systems, and more particularly to improved array structures of light emitting diodes used as lighting sources. Background technique [0002] A light-emitting diode (LED) is a semiconductor device, specifically a p-n junction, which emits electromagnetic rays when an electric current is applied to it. Typically, a light emitting diode comprises a semiconductor material which is a suitably selected mixture of gallium-arsenic-phosphorus. By changing the ratio of phosphorus to arsenic, the wavelength of light emitted by the LED can be tuned. [0003] Along with advances in semiconductor materials and optical technology, light-emitting diodes are increasingly used for lighting purposes. For example, high-brightness light-emitting diodes are commonly used in car signals, traffic lights and signboards, and large-area displays. In most applications, parallel LEDs are connected in an array configuration to ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCY10S362/80F21W2101/00H05B33/0821F21W2111/02H05B33/089F21W2107/00H05B45/40H05B45/52H05B45/54
Inventor 张劲
Owner SIGNIFY HOLDING B V
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