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LED backlight drive circuit and LCD display

A technology of backlight driving circuit and backlight source, applied in the field of circuits, can solve the problems of complicated circuit, short service life of CCFL, large power consumption and can not meet energy saving, etc., and achieve the effect of prolonging service life and reducing cost.

Active Publication Date: 2015-09-30
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, cold cathode fluorescent lamp CCFL is widely used as the backlight source in LCD displays, and the CCFL backlight drive circuit is an important part of the backlight control circuit. needs

Method used

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  • LED backlight drive circuit and LCD display
  • LED backlight drive circuit and LCD display
  • LED backlight drive circuit and LCD display

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0034] See figure 1, which is a structural schematic diagram of an LED backlight driving circuit provided by an embodiment of the present invention, the circuit includes:

[0035] DC / DC boost chip U1, input terminal CON1, power supply circuit 1, square wave signal conversion circuit 2, protection circuit 3, voltage detection circuit 4, backlight LED load circuit 5, resistor R6, MOS tube Q2, inductor L1, diode D2, fuse F1, capacitor C3, resistor R3, diode D1, resis...

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PUM

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Abstract

An embodiment of the invention discloses an LED backlight drive circuit and an LCD display. The circuit includes a DC / DC boost chip U1, a power supply circuit, a square wave signal converting circuit, a protection circuit, a voltage detecting circuit, a backlight source LED load circuit, an MOS tube Q2, an inductor L1 and a diode D2. The DC / DC boost chip U1, the MOS tube Q2, the inductor L1 and the diode D2 form a boost circuit; the power supply circuit supplies power to the DC / DC boost chip U1 and the DC / DC boost chip U1 provides voltage for the backlight source LED load circuit through the MOS tube Q2; the backlight source LED load circuit is connected to the voltage detecting circuit, the square wave signal converting circuit and the protection circuit separately so as to realize voltage stabilization. By adopting the LED backlight drive circuit, electricity consumption can be reduced and service lifetime of the LCD display can be prolonged.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to an LED backlight driving circuit and an LCD display. Background technique [0002] At present, cold cathode fluorescent lamp CCFL is widely used as the backlight source in LCD displays, and the CCFL backlight drive circuit is an important part of the backlight control circuit. needs. Contents of the invention [0003] The technical problem to be solved by the embodiments of the present invention is to provide an LED backlight driving circuit and an LCD display, which can use LEDs as the backlight, and the circuit is simple to achieve the purpose of energy saving. [0004] In order to solve the above technical problems, an embodiment of the present invention provides an LED backlight drive circuit, including a DC / DC boost chip U1, an input terminal CON1, a power supply circuit, a square wave signal conversion circuit, a protection circuit, a voltage detection circuit, a backli...

Claims

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Application Information

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IPC IPC(8): G09G3/34G09G3/36
Inventor 周明杰刘百顺
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD
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