Single chip LED as compact color variable light source

A technology of color light and color change, applied in semiconductor devices, electrical components, circuits, etc.

Active Publication Date: 2007-11-14
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the color of such an array is fixed, and even small variations in phosphor thickness between arrays result in different colors and thus large bin ranges for such arrays

Method used

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  • Single chip LED as compact color variable light source
  • Single chip LED as compact color variable light source
  • Single chip LED as compact color variable light source

Examples

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Embodiment Construction

[0033] An exemplary embodiment of the present invention, as shown in FIG. 1 , includes a nine-stack LED array 1 formed on a substrate in a 3*3 square structure.

[0034] The array is divided into three separate groups of LEDs, group 2 of one LED providing blue light, group 3 of four LEDs providing red light, and group 4 of four LEDs providing green light.

[0035] The three groups are respectively connected to the LED driver unit 6 with 7 (to cathode) and 17 (to anode) for blue, 8 (to cathode) and 18 (to anode) for green, Each connector in red 9 (to cathode) and 19 (to anode) can independently control the voltage and / or current through the three separate groups. Alternatively, the anodes or cathodes of the groups of LEDs are connected, resulting in only four electrically isolated connections between the LED driver unit and the LED array.

[0036] The array in Figure 1 thus constitutes an RGB unit that can provide light of any color within the color space defined by the blue, ...

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PUM

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Abstract

The present invention relates to a color variable light-emitting device comprising an array of a plurality of LEDs formed on one highly resistive substrate, which array comprises a first, a second and a third set of at least one LED arranged to provide light of a first, a second and a third color, respectively. At least one of the sets is independently addressable. Further, each light-emitting diode in the array has a separate connection to a circuitry, and at least one of the sets comprises at least two LEDs, interconnected in series via the circuitry. Thus, all connections between separate LEDs, for example in the same set, can be done via the circuitry. This also allows for a very dense packing of the LEDs in the array, as no interconnects between different LEDs of the array need to be arranged in the array.

Description

technical field [0001] The present invention relates to a color variable light emitting diode array formed on a high impedance substrate, comprising at least two groups of at least one light emitting diode, each group emitting light of an individual color. Background technique [0002] Light emitting diodes (LEDs) are becoming attractive alternatives to commonly used light bulbs as light sources. They are replacing light bulbs in automotive applications such as stop tail lights and exterior door signals as well as traffic signals. From room lighting to stage lighting, they also began to replace the usual light bulbs. [0003] Lighting systems employing LEDs have several advantages over standard light sources, such as longer life cycles, greater reliability, lower operating temperatures, and lower voltage power requirements. [0004] LED lighting systems for providing, for example, white light generally utilize multiple LEDs of different colors, and the different colors are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/15H01L33/50
CPCH01L27/156H01L2224/13H01L2924/0002H01L33/504
Inventor J·P·M·安森斯C·G·A·霍伦
Owner SIGNIFY HLDG BV
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