Light-emitting diode (LED) backlight driving circuit and liquid crystal television

A technology of LED backlight source and driving circuit, applied in the direction of light source, electric light source, electric lamp circuit layout, etc., can solve the problem of many devices and so on

Active Publication Date: 2013-05-08
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the drive circuit part needs a special drive chip to cooperate with the Boost topology peripheral circuit, and there are many components

Method used

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  • Light-emitting diode (LED) backlight driving circuit and liquid crystal television
  • Light-emitting diode (LED) backlight driving circuit and liquid crystal television
  • Light-emitting diode (LED) backlight driving circuit and liquid crystal television

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Embodiment Construction

[0020] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0021] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, therefore, the present invention is not limited to the specific embodiments disclosed below limit.

[0022] figure 2 A block diagram of an LED backlight driving circuit according to an embodiment of the present invention is shown.

[0023] like figure 2 As shown, the LED backlight driving circuit 200 according to the embodiment of th...

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PUM

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Abstract

The invention provides a light-emitting diode (LED) backlight driving circuit which comprises a rectifying filtering circuit, a resonance control circuit and an isolation driving circuit, wherein the rectifying filtering circuit receives alternating current input and outputs first direct current to the resonance control circuit, the isolation driving circuit is connected to the resonance control circuit and is used for outputting a driving signal, the resonance control circuit receives the driving signal from the isolation driving circuit and outputs second direct current to an LED backlight according to the driving signal and the first direct current. The invention further provides a liquid crystal television. According to the technical scheme of the LED backlight driving circuit and the liquid crystal television, a secondary circuit is utilized to drive and control the primary resonance circuit to supply power to the backlight, design of an original power supplying circuit is greatly simplified, production cost is reduced, and space utilization rate of a circuit board is also improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an LED backlight driving circuit and a liquid crystal television having the LED backlight driving circuit. Background technique [0002] LEDs are used as the backlight of LCD TVs, and there are at least two or more light bars on medium and large-sized LCD TVs. The driving mode of the power supply is to drive one LED light bar with one booster circuit, and realize the equal current of each light bar by sampling the current of each light bar, so as to meet the requirements of TV screen display. Multi-channel light strips generally use low-voltage 24V input. This method generally requires more chips and peripheral components, and the cost is relatively high. Therefore, increasing the number of LED lights for each light bar and reducing the number of light bars is the current trend of LED LCD TV backlighting. [0003] At present, 42-inch and 46-inch LED LCD TVs have two or more st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02G09G3/34
Inventor 丰明刚滕强迟洪波郝卫
Owner HISENSE VISUAL TECH CO LTD
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