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Power circuit for liquid crystal display device

A technology for liquid crystal display devices and power circuits, which is applied in the direction of electric light sources, lighting devices, light sources, etc., can solve problems such as rising manufacturing unit prices and complex circuit configurations, and achieve the effects of reducing manufacturing costs and simplifying power circuits

Inactive Publication Date: 2007-01-10
NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, it is necessary to have a rectifier 150 for rectifying the AC power of the secondary winding of the power transformer 1402 and providing it to the inverter.
[0018] Therefore, according to the prior art, there is a problem that the configuration of the circuit is complicated and the unit cost of its manufacture is increased.

Method used

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  • Power circuit for liquid crystal display device
  • Power circuit for liquid crystal display device
  • Power circuit for liquid crystal display device

Examples

Experimental program
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Embodiment Construction

[0034] Hereinafter, a power supply circuit for a liquid crystal display device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, a power supply circuit capable of supplying power to two backlight lamps will be described below as an example.

[0035] image 3 It is a diagram schematically showing the configuration of a power supply circuit for a liquid crystal display device according to the present invention. Figure 4 It is a schematic diagram illustrating timing generation of AC power in a power supply circuit for a liquid crystal display device according to the present invention.

[0036] Such as image 3 As shown, the power supply circuit for liquid crystal display device according to the ideal embodiment of the present invention is composed of the following parts: DC power supply 210, high-frequency AC power generator 220, inverter transformer 230, system rectifier 240, system d...

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PUM

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Abstract

The invention discloses a power supply circuit for liquid crystal display, which includes: an AC power supply generator for generating high frequency AC power supply; a transformer for transforming the AC power supply provided by the AC power supply generator; a first winding connecting to the transformer secondary winding, an AC power supply for receiving output of the first winding, a rectifier for carrying rectification to generate DC voltage for system drive; a second winding connecting to the transformer secondary winding, an AC power supply for receiving output of the second winding, a lighting power supply outputting machine for outputting AC power supply to back lamp capable of supplying DC voltage for the system drive and AC power supply for the back lamp using one transformer. According to the invention, the power supply circuit is simplified and the manufacturing cost is reduced.

Description

1. Technical field [0001] The present invention relates to a power supply circuit for a liquid crystal display device capable of supplying a DC power supply for driving a system and an AC power supply for a backlight with a single transformer. 2. Background technology [0002] A liquid crystal display device (LCD: Liquid Crystal Display) requires a backlight made of a fluorescent lamp as a non-luminescent display element. [0003] LED elements or electroluminescent elements such as EL lamps can be used for the backlight, but most of them use cold cathode fluorescent lamps (CCFL: Cold Catode Fluorescent Lamps) with high luminous efficiency and low price. [0004] Most backlights using fluorescent lamps use a light guide plate method. Fluorescent lamps are mounted on one or both ends of a light guide plate made of acrylic resin, and the fluorescent lamps are connected to the high-voltage AC output of the inverter to be driven. [0005] Below, refer to the attached figure 1 w...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09G3/20G02F1/133
CPCG02F1/1336H05B41/2822H05B41/36
Inventor 宋炫承
Owner NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD