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Drive circuit, method and backlight system for a plurality of loads

A technology of driving circuit and backlight system, applied in the field of driving circuit of backlight system and multiple loads, can solve the problems of unbalanced current of cold cathode fluorescent tube, uneven brightness of liquid crystal display, and shortening life of cold cathode fluorescent tube, etc. Reduction in the number of components and the effect of reducing the number of components and achieving current balance

Inactive Publication Date: 2012-02-29
AOTU ELECTRONICS WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the tolerance of the transformer of the inverter and CCFLs, the conventional circuit for driving multiple CCFLs may have the problem that the CCFL currents cannot be balanced
Cold cathode fluorescent tube current imbalance can reduce the life of cold cathode fluorescent tubes and cause uneven brightness of LCD screens

Method used

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  • Drive circuit, method and backlight system for a plurality of loads
  • Drive circuit, method and backlight system for a plurality of loads
  • Drive circuit, method and backlight system for a plurality of loads

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Embodiment Construction

[0015] A detailed description will be given below of embodiments of the present invention. Although the invention will be described in conjunction with certain specific embodiments, the invention is not limited to the specific embodiments described. Any modifications or equivalent replacements made to the present invention shall fall within the scope of the claims of the present invention.

[0016] figure 1 Shown is a schematic diagram of a circuit 100 for driving a plurality of CCFLs according to one embodiment of the present invention. Circuit 100 may include power cord 110 , power box 120 , transformers 101 and 103 , CCFLs 111 , 113 , 115 and 117 , and a current sensor 130 . Cold cathode fluorescent tubes 111 , 113 , 115 and 117 can provide backlight for liquid crystal display 140 . The power box 120 is connected to the parallel connected primary coils of the transformers 101 and 103 . The power box 120 can convert a DC input voltage VCC from the power line 110 into an ...

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Abstract

A circuit comprises a power tank, a pair of transformers and multiple loads. The power tank converts a DC input voltage to an AC voltage. The pair of transformers comprise a pair of primary windings and a pair of secondary windings and transform the intermediate AC voltage to an output AC voltage. The pair of primary windings are coupled to the power tank for receiving the intermediate AC voltage, and the pair of secondary windings provide the output AC voltage. The loads are coupled to the pair of secondary windings for receiving the output AC voltage. The pair of secondary windings are serially coupled to each other through the series-coupled loads to achieve current balance among the loads.

Description

technical field [0001] The invention relates to a backlight circuit for a liquid crystal display, in particular to a driving circuit, a method and a backlight system for multiple loads. Background technique [0002] Liquid crystal displays are used in everything from portable electronic devices to fixed-location equipment units such as video cameras, car navigation systems, notebook computers, and industrial equipment. The LCD screen itself cannot emit light, but needs to be backlit by a light source. A cold cathode fluorescent tube (CCFL) is one of the common backlight light sources. Typically, CCFLs require a large AC signal to light and drive. To derive a large AC signal from a DC source (eg, a rechargeable battery), a DC / AC inverter including a power tank and transformer needs to be designed. [0003] Recently, there has been increasing interest in large-size LCD panels used in LCD TVs and computer monitors. Large-size LCD screens require multiple cold-cathode fluore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/24G09G3/36
CPCH05B41/282Y02B20/183Y02B20/00
Inventor 李友玲李胜泰胡应鹏
Owner AOTU ELECTRONICS WUHAN
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