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Driving apparatus for lamp of liquid crystal display device

A backlight drive and transistor technology, applied in the field of light drive devices, can solve problems such as power loss, high voltage boost ratio, and low conversion efficiency

Inactive Publication Date: 2007-01-10
LG PHILIPS LCD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the above process, power is lost in every step of converting common power into tube current for driving the backlight
In particular, in the step-up process by the DC / DC converter 23 at the inverter 24, since the voltage is boosted from 24V to 1000V, the voltage step-up ratio is high, which results in low conversion efficiency

Method used

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  • Driving apparatus for lamp of liquid crystal display device
  • Driving apparatus for lamp of liquid crystal display device
  • Driving apparatus for lamp of liquid crystal display device

Examples

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Embodiment Construction

[0017] Reference will now be made in detail to preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.

[0018] image 3 is a block diagram showing an apparatus for driving a backlight unit according to an exemplary embodiment of the present invention. Such as image 3 As shown, the rectification and filtering part 31 converts the AC voltage applied from the common power supply 30 into a DC voltage. The converted DC voltage from the rectification filter section 31 is boosted to a DC voltage of 400V by the PFC circuit section 32 . The boosted voltage is sent to each driving device in the system that needs a driving voltage.

[0019] The DC / AC converter 33 boosts the 400V DC voltage boosted by the PFC circuit portion 32 to an AC voltage of 1000V. The DC / AC converter includes a switching block 35 and a step-up transformer 36 . The switching block 35 converts the DC voltage of 400V into AC voltage. The converted AC voltage from t...

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PUM

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Abstract

Driving apparatus for lamp of liquid crystal display device. A backlight driving apparatus comprises a rectifying-smoothing part to convert an AC voltage supplied from a common power source into a DC voltage, a power factor correction circuit part to boost the DC voltage converted from the rectifying-smoothing part, and a DC / AC converter to convert the boosted DC voltage from the power factor correction circuit part into a boosted AC voltage such that the boosted AC voltage drives a backlight.

Description

technical field [0001] The present invention relates to a lamp driving device of a liquid crystal display device, and more particularly, to a method and a device for driving a lamp of a liquid crystal display device. Background technique [0002] Generally, a liquid crystal display (LCD) device includes a liquid crystal display panel having a plurality of control switches and a plurality of liquid crystal cells arranged in a matrix. These control switches supply video signals to the respective liquid crystal cells, thereby controlling the amount of transmitted light supplied from the backlight unit to the liquid crystal cells to display a picture. [0003] As shown in FIG. 1 , most LCD devices in the prior art are manufactured as a transmissive type in which a backlight unit 2 is mounted on the back of an LCD panel 1 . The related art LCD panel 1 controls transmittance of light incident from a backlight unit 2 to display images on the LCD panel 1 . Light incident from the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133
CPCH05B41/282Y02B20/183Y02B20/00G02F1/133
Inventor 田镇焕张燻
Owner LG PHILIPS LCD CO LTD