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Energy saving power supply of backlight source of LCD device

A liquid crystal display and energy-saving power supply technology, which is applied to static indicators, instruments, etc., can solve the problems of large heat generation, high manufacturing cost, and low energy conversion efficiency, and achieve the effect of improving energy conversion efficiency and reducing manufacturing cost

Inactive Publication Date: 2008-10-29
SKYWORTH LCD SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned backlight power supply requires a DC / DC inverter to output low voltage and high current, so there are defects such as large heat generation, low energy conversion efficiency and high manufacturing cost

Method used

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  • Energy saving power supply of backlight source of LCD device

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] An energy-saving power supply for LCD backlight composed of four CCFLs

[0018] The energy-saving power supply as shown in the accompanying drawings includes an EMI filter circuit 1, a full-wave rectification circuit 2, and a power factor correction circuit 3 connected step by step. The EMI filter circuit 1 is connected to an AC input power supply.

[0019] A DC / AC inverter 4 with a half-bridge topology directly connected to the output end of the power factor correction circuit is provided, and the output end of the DC / AC inverter 4 is connected to the output end of the power factor correction circuit through a coupling capacitor C4 and three inductors L2 , L3, L4 parallel group composed of balanced current output circuit respectively connected to CCFL1, CCFL2, CCFL3, CCFL4 correspondingly.

[0020] The DC / AC inverter 4 with a half-bridge topology structure includes first and second field effect transistors Q1 and Q2, first and second capacitors C1 and C2, field effect ...

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Abstract

The invention discloses an energy saving power of a LCD backlight source, including the filter circuit, rectifier circuits, and power factor correction circuit. The filter circuit is connected to AC power. It characters that power factor correction circuit output terminal is connected directly to the half-bridge topology DC / AC inverter. DC / AC inverter output terminal is connected to cold cathode fluorescent lamp. The invention circuit compared with the existing technical has beneficial effects, omit the former class DC / DC converters, by the half-bridge topology with a DC / AC inverter produce high-voltage alternating current to the LCD backlight directly provide energy, energy conversion more efficiency of nearly 10%, and lower manufacturing costs of about 20%.

Description

technical field [0001] The invention relates to a Liquid Crystal Display (LCD for short), in particular to an energy-saving power supply for an LCD backlight source. Background technique [0002] Cold cathode fluorescent lamps (CCFL for short) are commonly used in existing LCD backlight sources. The power supply generally adopts two-stage inverters at the front and rear. ) filtering, rectification, power factor correction (Power Factor Correction, referred to as PFC) the AC input voltage is inverted into a DC voltage, and then the DC voltage is converted into a constant current AC high voltage through a DC / AC inverter, also known as a high-voltage package. CCFL is a closed gas discharge tube, and the main gases in the tube include argon, neon, krypton and other gases. When a constant current AC high voltage is applied across the CCFL, the gas is ionized to generate ultraviolet rays. The ultraviolet light bombards the luminescent material coated on the inner wall to excite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G09G3/34
Inventor 朱锡勤
Owner SKYWORTH LCD SHENZHEN CO LTD