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Method and driver for determining drive values for driving a lighting device

一种照明装置、驱动值的技术，应用在照明装置、仪器、静态指示器等方向，能够解决不适合、色移等问题，达到延长寿命、低衬底温度、放宽时序和信号完整性要求的效果

Active Publication Date: 2009-09-16
SIGNIFY HLDG BV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such systems are not suitable for driving lighting fixtures comprising multiple LEDs of different colors, since the shift in amplitude also results in significant color shift

Method used

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  • Method and driver for determining drive values for driving a lighting device
  • Method and driver for determining drive values for driving a lighting device
  • Method and driver for determining drive values for driving a lighting device

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Embodiment Construction

[0031] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which presently preferred embodiments of the invention are shown. However, this invention may be embodied in many different forms and should not be construed as limited to these embodiments set forth herein; rather, these embodiments are provided for sufficiency and completeness, and to fully convey to those skilled in the art clearly convey the scope of the invention. The same reference numerals are used to refer to the same elements throughout.

[0032] Referring now to the drawings and in particular to figure 1 , depicts a block diagram of a color adjustable lighting system 100 arranged in accordance with a presently preferred embodiment of the present invention. In the exemplary embodiment, lighting system 100 includes lighting device 101 that includes three differently colored light emitting diodes of red 102 , green 103 , and blue 104 . The lightin...

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Abstract

The present invention relates to a method for determining drive values for driving a lighting device at a desired brightness and color. The method comprising the steps of determining a first luminous flux weight ratio based on the desired color and a first drive current for driving each of the differently colored LEDs, determining a first luminous flux for each of the differently colored LEDs based on the desired brightness and the first luminous flux weight ratio, comparing, for each of the differently colored LEDs, the first luminous flux with a nominal luminous flux for a plurality of different drive currents, selecting, for each of the differently colored LEDs, a preferred drive current that at least can produce the first luminous flux, determining a second luminous flux weight ratio based on the desired color and the selected drive currents for each of the differently colored LEDs, determining a second luminous flux for each of the differently colored LEDs based on the desired brightness and the second luminous flux weight ratio, and determining a duty cycle for each of the differently colored LEDs at the selected drive currents, wherein the selected currents at the determined duty cycles produces the second luminous flux for each of the differently colored LEDs. The present invention provides for the possibility to limit the number of necessary computational steps for determining preferred drive currents. Furthermore, an increase in number of current level and / or differently colored LEDs would only slightly increase the computational cost.

Description

technical field [0001] The invention relates to a method for determining drive values ​​to drive a lighting device to a desired brightness and color. The invention also relates to a corresponding driver for determining an actuation value for driving a lighting device. Background technique [0002] Recently, great progress has been made in increasing the brightness of light emitting diodes (LEDs). Thus, LEDs have become sufficiently bright and inexpensive to be used, for example, as light sources in lighting systems such as color adjustable lamps, direct view liquid crystal displays (LCDs), and front and rear projection displays. [0003] By mixing LEDs of different colors, any number of colors can be generated, such as white. Color adjustable lighting systems are typically constructed using a number of primary colors, in one example the three primary colors red, green and blue. The color of the light generated is determined by which LEDs are used and the mixing ratio. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCG09G3/3413G09G2320/041H05B33/0872H05B33/0869H05B33/0818H05B33/0863G09G2320/0693G09G2320/0666H05B45/22H05B45/28H05B45/37
Inventor A·C·德里克R·范沃登伯格H·M·彼得斯P·H·F·多伊伦伯格
Owner SIGNIFY HLDG BV
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