System and apparatus for controlling light intensity output of light emitting diode arrays

一种光强度、阵列的技术，应用在电致发光光源、光学、光源等方向，能够解决昂贵、不实际等问题

Inactive Publication Date: 2012-02-08
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The downside of this solution is that it requires a high-speed, high-resolution analog-to-digital converter to measure the forward voltage of up to a thousand or more LEDs
This solution is expensive and therefore impractical

Method used

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Examples

Experimental program
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Embodiment Construction

[0026] In view of the disadvantages associated with variations in light intensity of LEDs in certain applications, a method and system are described to control drive current. More generally, applicants have recognized and appreciated that it would be beneficial to predict the junction temperature of an LED and adjust the drive current required to meet intensity requirements in future frames. In the following detailed description, for purposes of illustration and not limitation, representative examples disclosing specific details are presented in order to provide a thorough understanding of the present teachings. Descriptions of well-known devices, materials, and methods of fabrication may be omitted so as not to obscure the description of representative embodiments. Nonetheless, such devices, materials, and methods, which are within the knowledge of one of ordinary skill in the art, may be used in accordance with representative embodiments.

[0027] Refer to attached figure ...

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PUM

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Abstract

Disclosed herein is a system for controlling a drive current of an LED that includes a controller configured to estimate a junction temperature of the LED at a location of a heat sink. The system also includes a driver configured to change a drive current to the LED in response to a command from the controller. Also disclosed is a method of determining drive currents for LEDs in an array that includes determining a required light output intensity at a first time for each LED; estimating heat generated by each LED at the first time; solving heat flow equations for the array at the first time; estimating a junction temperature for each of the LEDs at the first time; and determining a drive current for the required light intensity at the first time for each of the LEDs based on the junction temperature.

Description

technical field [0001] The present invention generally relates to light emitting diode (LED) arrays. More specifically, various methods and apparatus of the invention disclosed herein relate to methods and systems for controlling the light intensity output of LED arrays. Background technique [0002] Digital lighting technology, ie lighting based on semiconductor light sources such as LEDs, offers a viable alternative to traditional fluorescent, HID and incandescent lamps. Functional advantages and benefits of LEDs include: high energy conversion and optical efficiency, durability, lower operating costs, and many others. Recent advances in LED technology have provided efficient and reliable full-spectrum light sources that can achieve a variety of lighting effects in many applications. Some fixtures embodying these light sources feature lighting modules that include one or more LEDs capable of producing different colors such as red, green, and blue and for independently co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08G02F1/13357G09G3/34H05B44/00
CPCG09G3/3426G09G2320/0233G09G2320/041G09G2320/0633G09G2320/064H05B45/18H05B45/20
Inventor I·阿什当
Owner SIGNIFY HLDG BV
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