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Novel liquid crystal display television backlight drive circuit

A technology of LCD TV and driving circuit, applied in the field of LCD TV backlight drive, can solve problems such as damage to backlight and dimming MOS tube, and achieve the effect of reducing overshoot current

Active Publication Date: 2017-06-30
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to propose a new LCD TV backlight drive circuit to solve the problem that the overshoot current of the traditional LCD TV LED backlight may damage the backlight and the dimming MOS tube.

Method used

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  • Novel liquid crystal display television backlight drive circuit
  • Novel liquid crystal display television backlight drive circuit

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Embodiment

[0016] The new LCD TV backlight drive circuit in this embodiment includes a DC power supply module, a ground wire, a transformer, an LED lamp group, a backlight drive control circuit module, a first MOS transistor Q1, a second capacitor C2 and a second diode D2, and Circuit diagram see figure 2 . Wherein, the DC power supply module is connected to the transformer, the cathode of the second diode D2 is connected to the sixth pin of the transformer, the anode is connected to the negative pole of the second capacitor C2, the positive pole of the second capacitor C2 is connected to the ground wire, and the negative pole of the LED lamp group is connected to the first The anode and anode of the second diode D2 are connected to the ground wire, the drain of the first MOS transistor Q1 is connected to the fifth pin of the transformer, the source is connected to the ground wire, and the gate is connected to the backlight driving control circuit module.

[0017] In the above circuit,...

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PUM

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Abstract

The invention relates to the liquid crystal display television backlight driving technology. According to the technology, the problem that overshoot current may damage backlights and dimming MOS transistors when LED backlight dimming is performed on a traditional liquid crystal display television is solved. According to the novel liquid crystal display television backlight drive circuit, the technical scheme generally comprises a direct current supply module, ground wires, a transformer, an LED light set and a backlight drive control circuit module, and is characterized by including a first MOS transistor, a second capacitor and a second diode. The novel liquid crystal display television backlight drive circuit has the advantages that through the dotted terminal inversion of the transformer, the negative output of backlight voltage is achieved, so that the overshoot current is reduced in order to protect the backlights and the dimming MOS transistors, which is suitable for a liquid crystal display television.

Description

technical field [0001] The invention relates to LCD TV technology, in particular to LCD TV backlight driving technology. Background technique [0002] The LCD TV backlight system has developed from the traditional cold cathode fluorescent lamp (CCFL) and external electrode fluorescent lamp (EEFL) to the current LED. Compared with the traditional lamp backlight, LED has the advantages of low power consumption and small size. In the topological structure of the LED backlight driving circuit, AC-DC is more often used to generate DC voltage, and then the backlight is driven through the DC-DC BOOST boost. This circuit topology is relatively mature. [0003] In the BOOST driving LED backlight circuit system, the general LCD TV will adopt the PWM digital dimming method. The main feature of the circuit of this dimming method is to use a dimming MOS tube, here is the first MOS tube Q1, which controls the flow of the backlight current. off, the backlight current is switched between t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34H04N5/44
CPCG09G3/3406H04N5/44
Inventor 黄德军
Owner SICHUAN CHANGHONG ELECTRIC CO LTD