Exponential dimming method and system for a light emitting diode

A light-emitting diode and index technology, applied in the field of dimming, can solve problems such as complex dimming methods, and achieve the effect of simple dimming methods, less hardware resources, and high precision

Active Publication Date: 2021-05-04
SHANGHAI AWINIC TECH CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

The existing LED index dimming method is relatively complicated

Method used

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  • Exponential dimming method and system for a light emitting diode
  • Exponential dimming method and system for a light emitting diode
  • Exponential dimming method and system for a light emitting diode

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Embodiment Construction

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0043] As mentioned in the background art, the current methods for realizing LED index dimming through digital circuits mainly include: look-up table method, segmented line method and iterative method. However, the existing LED index dimming method is relatively complicated.

[0044] Specifically, the look-up table method requires more hardware resources for digital circuits, especially when the dimming resolution is required to be higher and higher, the hardw...

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Abstract

The invention discloses a method and system for exponential dimming of light-emitting diodes, comprising: acquiring Nbit dimming control codes; judging all numbers, and obtaining the corresponding coefficient of the i-th number when the i-th number is 1 as [(I max / I min )^(1 / code max )]^(2^i), and the corresponding coefficient obtained when the number is 0 is 1; according to formula I Dac =I 计算 *(Corresponding coefficient of the N-1th digital number *···*The corresponding coefficient of the zeroth digital number), the adjustment current is obtained by calculation; the light-emitting diode is dimmed according to the adjustment current. Combine Formula I Dac =I 计算 *(Corresponding coefficient of the N-1th digital number *... *corresponding coefficient of the zeroth digital number) can be obtained, for the Nbit dimming control code, the adjustment current can be obtained by the multiplication of the N coefficients, and the dimming method is more Simple, and can occupy less hardware resources, while ensuring high precision of dimming current.

Description

technical field [0001] The present invention relates to the technical field of dimming, and more specifically, to an exponential dimming method and system for light-emitting diodes. Background technique [0002] With the popularization of LED (Light Emitting Diode, light-emitting diode) lighting applications, the development of LED driving and dimming technologies is also changing with each passing day. At present, in terms of LED backlight dimming, more and more LED driver chips use exponential dimming curves compared to linear dimming curves. This is because at low brightness, the brightness changes of the exponential curve will make the human eyes more comfortable. experiences and feelings. Commonly used exponential dimming methods include analog and digital. Analog circuits can achieve exponential dimming through corresponding analog devices such as diodes, but the accuracy and stability of analog dimming methods are far inferior to digital circuits. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/10H05B45/30H05B44/00
CPCH05B45/10
Inventor 蒋知广张忠高桂华祝尊震杜黎明孙洪军乔永庆
Owner SHANGHAI AWINIC TECH CO LTD
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