Backlight source driving circuit and driving circuit thereof as well as liquid crystal television

A technology for driving circuits and backlight sources, which is applied to TVs, color TVs, components of color TVs, etc., can solve the problems of multi-chip and peripheral components, high cost, complex circuit structure, etc., and achieves simple and easy circuit implementation and work. Stable, simple circuit structure effect

Active Publication Date: 2011-11-16
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Using the above power supply and driving methods requires more chips an

Method used

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  • Backlight source driving circuit and driving circuit thereof as well as liquid crystal television
  • Backlight source driving circuit and driving circuit thereof as well as liquid crystal television
  • Backlight source driving circuit and driving circuit thereof as well as liquid crystal television

Examples

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Embodiment Construction

[0056] The present invention will be further described below in conjunction with the accompanying drawings.

[0057] Such as figure 2 As shown, the backlight driving circuit of the present invention includes: a backlight power supply circuit and a control circuit; wherein,

[0058] The backlight power supply circuit, according to the received driving pulse signal output by the control circuit, provides the voltage required for operation to the backlight load;

[0059] The control circuit, in response to the control voltage signal, samples the working current of the backlight load in real time, generates and outputs a corresponding driving pulse signal according to the sampled current signal.

[0060] As a further embodiment of the present invention, the backlight power supply circuit includes: LLC resonance control and energy transfer circuit 14 and rectification and filtering circuit 15; wherein,

[0061] The LLC resonance control and energy transfer circuit 14, according ...

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PUM

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Abstract

The invention discloses a backlight source driving circuit and a driving circuit thereof as well as a liquid crystal television which are provided mainly aiming at the problems of multiple components, complicated structure and the like of the existing backlight source driving circuit. The backlight source driving circuit disclosed by the invention comprises a backlight source power supply circuitand a control circuit, wherein the backlight source power supply circuit supplies the voltage which is needed by the operation to a backlight source load according to the received driving pulse signals which are output by the control circuit; and the control circuit responses to control voltage signals, samples the operating current of the backlight source load in real time, and generates and outputs the corresponding driving pulse signals according to the sampled current signals. The backlight source driving circuit disclosed by the invention has the advantages of simple structure and stabledriving.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display backlight sources, in particular to a backlight source driving circuit, a driving method thereof, and a liquid crystal television. Background technique [0002] At present, LED (Light Emitting Diode) has been widely used as the backlight source of liquid crystal display. Among them, the medium and large size LED LCD TV backlight has at least two light strips, and the power supply and driving methods of each light strip are as follows: figure 1 Shown: [0003] The power supply unit is composed of a PFC (Power Factor Correction, power factor correction) power supply 1 and a half-bridge resonant control circuit 2; it provides electric energy for the circuit connected to it; [0004] Secondary power supply unit comprises: LLC resonance control and energy transfer circuit 3 and secondary power supply circuit 4; Wherein, the input end of described LLC resonance control and energy transf...

Claims

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Application Information

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IPC IPC(8): G09G3/36H04N5/63
Inventor 孟现策迟洪波辛晓光韩文涛
Owner HISENSE VISUAL TECH CO LTD
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