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Light source intensity control system and method

A technology of control system and light source, applied in the field of lighting, can solve problems such as complex optical feedback system

Inactive Publication Date: 2009-03-04
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, while the Muthu et al. reference provides a way to achieve control of the spectral power distribution of output light with desired color properties, this way uses a complex optical feedback system
In addition, a drawback of the process as disclosed by Muthu et al. is that it imposes excessive thermal stress on the LED during the low frequency ON and OFF cycles required by the optical feedback system.

Method used

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Embodiment Construction

[0025] definition

[0026] The term "Light Emitting Element" (LEE) is used to define any device capable of emitting light, for example in the visible, infrared and / or ultraviolet region, when activated, for example by applying a potential difference across it or by passing a current through it. Emitting radiation within any region or combination of regions of the electromagnetic spectrum. Therefore, the light-emitting element can have monochromatic or quasi-monochromatic spectral emission characteristics. Examples of light emitting elements include semiconducting, organic or polymer / polymeric light emitting diodes, blue or UV excited phosphor light emitting diodes, optically excited nanocrystal light emitting diodes or any other similar devices, as would be readily apparent to those skilled in the art. understand that. Furthermore, the term light-emitting element is used to define a specific device capable of emitting radiation, such as an LED die, and can likewise be used t...

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Abstract

The light source comprises one or more first light-emitting elements for generating light having a first wavelength range and one or more second light-emitting elements for generating light having a second wavelength range. The first light-emitting elements and second light-emitting elements are responsive to separate control signals provided thereto. A control system receives a signal representative of the operating temperature from one or more sensing devices and determines first and second control signals based on the desired colour of light and the operating temperature. The light emitted by the first and second light-emitting elements as a result of the received first and second control signals can be blended to substantially obtain the desired colour of light. The desired colour of light generated can thus be substantially independent of junction temperature induced changes in the operating characteristics of the light-emitting elements.

Description

technical field [0001] The invention relates to the lighting field, in particular to an intensity control system for a light source. Background technique [0002] Recent advances in the development of semiconductor light emitting diodes (LEDs) and organic light emitting diodes (OLEDs) have made these devices suitable for general lighting applications including, for example, architectural, entertainment and pavement lighting. As a result, these devices have become increasingly competitive with light sources such as incandescent, fluorescent, and high-intensity discharge lamps. [0003] Due to the natural lighting properties of white light, it is often preferred for lighting. An important consideration for LED-based light sources for ambient lighting and LED-based backlights for liquid crystal displays (LCDs) is the need to produce natural white light. White light can be generated by mixing light emitted from LEDs of different colors. [0004] Various standards have been pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B33/08H01L33/00H05B44/00
CPCH05B33/0863H05B33/0869H05B33/0872H05B45/28F21Y2115/10H05B45/20H05B45/22H05B45/46
Inventor K·文I·阿什当
Owner KONINK PHILIPS ELECTRONICS NV