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LED drive circuit and liquid crystal display device

An LED drive and LED light string technology, applied in lighting devices, electric light sources, electrical components, etc., can solve the problems of spikes, inaccuracy of LED light string current, noise generated by transformer T904, etc., to avoid spikes and control accurate. , the effect of reducing the delay of the signal

Inactive Publication Date: 2018-01-26
HISENSE VISUAL TECH CO LTD
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Problems solved by technology

However, since the optocoupler feedback circuit needs a certain amount of time to perform photoelectric conversion, there will be a certain delay in the response of the chip IC914 to the current feedback signal of the LED light string, so that the control of the chip IC914 on the current of the LED light string becomes variable. Inaccurately, the above delay can easily lead to a spike in the LED string current in the dimming state (such as figure 2 shown), and it is also easy to generate noise in the transformer T904 of the LED string

Method used

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  • LED drive circuit and liquid crystal display device
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  • LED drive circuit and liquid crystal display device

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Embodiment Construction

[0028] Various embodiments are now described with reference to the drawings, wherein like elements are designated with like reference numerals. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that the described embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

[0029] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, the terms "first", "second" are limited to Two" features may explicitly or implicitly include one or more of these features. "First" and "second" in the following embodiments are only used ...

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Abstract

The embodiment of the present invention provides an LED drive circuit and a liquid crystal display device which can control an LED lamp string current accurately. The LED drive circuit comprises an LLC resonance circuit module, a full-bridge rectifier filtering module, an LED lamp string module, a current detection circuit module, a control circuit module and a driving transformer. The output endof the LLC resonance circuit module is connected with the input end of the full-bridge rectifier filtering module, the output end of the full-bridge rectifier filtering module is connected with the positive pole of the LED lamp string module, and the first end of the current detection circuit module is connected with the negative pole of the LED lamp string module and the first end of the controlcircuit module; the second end of the current detection circuit module is grounded, the second end of the control circuit module is connected with the secondary first end of the driving transformer, the third end of the control circuit module is connected with the secondary second end of the driving transformer, and the primary of the driving transformer is connected with the LLC resonance circuitmodule. The LED drive circuit and the liquid crystal display device of the present invention are suitable for the liquid crystal television field.

Description

[0001] The application date is September 16, 2015, the application number is 201510348881.0, and the invention name is a Divisional application for patents on LED drive circuits and liquid crystal display devices. technical field [0002] The invention relates to the field of liquid crystal televisions, in particular to an LED (Light Emitting Diode, ie: light emitting diode) driving circuit and a liquid crystal display device. Background technique [0003] In the current LCD TV field, the use of LED backlight has become the mainstream of the industry. Such as figure 1 As shown, it is an LED driving circuit provided in the prior art. In this LED drive circuit, the chip IC914 is in the high-voltage area, and the LED light string is in the low-voltage area. In order to feed back the current of the LED light string to the chip IC914, it is necessary to use figure 1 The optocoupler feedback circuit in the current feedback. However, since the optocoupler feedback circuit n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08G09G3/34H05B44/00
Inventor 辛惠莹刘广学
Owner HISENSE VISUAL TECH CO LTD
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