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Light emitting diode (LED) driving device

A technology of light-emitting diodes and driving devices, which can be applied to instruments, static indicators, etc., and can solve problems such as cost waste

Active Publication Date: 2014-03-19
POWER FOREST TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the number of regulation channels of off-the-shelf current regulation chips is usually fixed (for example, the number of regulation channels is usually 4 or 6), and since one regulation channel is used to regulate the current flowing through a group of LED strings, when the light When the diode backlight module has, for example, 10 groups of light-emitting diode strings (the number is determined based on the size of different panels), it is necessary to select 3 current regulation chips with 4 regulation channels, or select 2 current regulation chips with 6 A current regulation chip that adjusts the number of channels, but no matter which one is selected, there will be two unused regulation channels, which will undoubtedly cause unnecessary waste of cost

Method used

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  • Light emitting diode (LED) driving device
  • Light emitting diode (LED) driving device
  • Light emitting diode (LED) driving device

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Embodiment Construction

[0024] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In addition, wherever possible, elements / members using the same reference numerals in the drawings and embodiments represent the same or similar parts.

[0025] figure 1 It is a schematic diagram of an LED driving device 10 according to an embodiment of the present invention. Please refer to figure 1 The LED driving device 10 of this embodiment is at least suitable for driving a light emitting diode (LED) backlight module (light emitting diode (LED) backlight module) 20 of a liquid crystal display (liquid crystal display, LCD), but is not limited thereto. Wherein, the light-emitting diode backlight module 20 has multiple groups of light-emitting diode strings (LED strings) LLBi (i=1~m) arranged in parallel, and each light-emitting diode string LLBi (i=1~m) is composed of multiple LED strings. Composed of light-emi...

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Abstract

The invention provides a light emitting diode (LED) driving device. The device comprises: a power switching circuit, which is used to receive and switch an input power supply so as to produce a direct current (DC) voltage which can simultaneously drive multiple groups of parallel LED strings; a plurality of current adjusting chips possessing a single regulation channel, wherein the current adjusting chips correspond with the LED strings, the ist current adjusting chip is only used to adjust a current flowed through the ist group of the LED string and the i is a positive integer.

Description

technical field [0001] The present invention relates to a light emitting diode driving device, in particular to a light emitting diode driving device with expandable and current balance / current matching characteristics. Background technique [0002] In recent years, with the vigorous development of semiconductor technology, portable electronic products and flat panel display products are also emerging. Among many types of flat panel displays, Liquid Crystal Display (LCD) has become the mainstream of various display products due to its advantages of low voltage operation, no radiation scattering, light weight and small size. Generally speaking, since the liquid crystal display panel itself does not have the characteristic of self-illumination, a backlight module must be placed under the liquid crystal display panel to provide the required (back) light source for the liquid crystal display panel. [0003] Traditional backlight modules can be roughly divided into two categorie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34G09G3/36
Inventor 史富元曾扬玳
Owner POWER FOREST TECH
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