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Device and method for controlling the color point of an LED light source

A technology of LED light source and color point, applied in the field of color point equipment, can solve problems such as segmental crosstalk and affecting optical sensors

Inactive Publication Date: 2011-04-13
KONINK PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, it may not be practical to optically isolate the segments from each other, which would result in significant crosstalk between the segments, i.e. each LED string affecting substantially all of the optical sensors

Method used

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  • Device and method for controlling the color point of an LED light source
  • Device and method for controlling the color point of an LED light source
  • Device and method for controlling the color point of an LED light source

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Embodiment Construction

[0052] The theory of additive color mixing will be discussed before describing and illustrating the details of the invention.

[0053] If the light of n light sources is mixed (additive color mixing), the luminous flux and chromaticity coordinates of the mixed light, that is, brightness and color, can be calculated according to the luminous flux and chromaticity coordinates of n light sources.

[0054] The power spectral density is P i (λ), i=1,..., the additive mixing of the light of n light sources of n obtains the mixed light with following power spectral density:

[0055] P ( λ ) = Σ i = 1 n P i ( λ ) - - - ( 1 )

[0056] The tristimulus values ​​of the mixed light are as follows:

...

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Abstract

The present invention relates to a device and method for controlling the color point of an LED light source (50). Color point control is a most interesting product feature both for white and colored LED light sources. In known methods for the color control of RGB LED light sources use is made of flux and color sensors. However, there are difficulties with respect to sensing quickly changing ambient light, deeply dimmed colors, coordinating the measurements with the switching of the LEDs, and controlling the color in LED light units comprising a number of independent LED lamps, e.g. segmented wall washers and LCD backlights. It is proposed according to the present invention to control the color of the LED light source (50), using a model-based feed forward approach. Factors relating the parameters controlling the LED currents to the brightness for the different colors (and segments) are stored and used for open loop control. A slow-running procedure continuously measures and updates these factors. Whilst the measurements are e.g. synchronized with the PWM, the procedure itself can run considerably slower and updates the factors asynchronously.

Description

technical field [0001] The invention relates to a device and a corresponding method for controlling the color point of an LED light source. Background technique [0002] Light-emitting diode (LED) white light sources are expected to have a major impact on the general lighting market. White LED lights based on additive color mixing have unique advantages over white LED lights based on phosphor conversion: potentially higher efficiency, adjustable color temperature, and the possibility of producing colored light. Color point control is the most interesting product feature for both white and colored light. Electronic compensation for manufacturing scalability / aging / temperature / current related color changes has the potential to achieve substantial cost advantages and may even be the only commercially viable solution. Color stability and reproducibility are important factors for mass markets: it must be possible to operate lamps with nominally the same color point close to each...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCG09G2360/147G09G2320/0666Y02B20/341G09G2320/0242G09G2320/064G09G3/3413H05B33/086G09G3/3426B61L5/1881Y02B20/30H05B45/28H05B45/59
Inventor B·阿克曼D·亨特C·马丁尼E·尼乌夫兰德斯G·绍尔拉恩德M·文特
Owner KONINK PHILIPS ELECTRONICS NV
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