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Apparatus and method for driving backlight of liquid crystal display apparatus

A liquid crystal display device, backlight driving technology, applied in lighting devices, identification devices, optics, etc., can solve problems such as electric shocks to inspectors or consumers, and backlight drive devices do not have error detection functions, etc.

Inactive Publication Date: 2010-08-18
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] As described above, the prior art backlight driving device does not have an error detection function, so that inspectors or consumers may receive electric shocks

Method used

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  • Apparatus and method for driving backlight of liquid crystal display apparatus
  • Apparatus and method for driving backlight of liquid crystal display apparatus
  • Apparatus and method for driving backlight of liquid crystal display apparatus

Examples

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Embodiment Construction

[0063] Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings. Throughout the drawings, the same reference numerals are used to designate the same or similar parts.

[0064] FIG. 4 is a block diagram showing the structure of a backlight driving device of a liquid crystal display (LCD) device according to an embodiment of the present invention.

[0065] Referring to FIG. 4 , a backlight driving device 300 according to an embodiment of the present invention includes a master DC / AC switching part 205 , a slave DC / AC switching part 206 , a master transformer 207 and a slave transformer 208 .

[0066] The backlight driving device 300 also includes: a lamp driving controller 301, configured to generate a push-pull gate signal for controlling a plurality of lamps 201 according to the pulse dimming signal; a master driver 302 and a slave driver 303, configured to respond to the The push-pull gate signal is ...

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PUM

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Abstract

The invention provides a backlight driving device used for a liquid crystal display device and a method thereof. The backlight driving device of the liquid crystal display (LCD) device comprises a main transformer and an auxiliary transformer which are used for supplying current to a plurality of lamps, and a main driver and an auxiliary driver which are used for driving the lamps. The backlight driving device comprises a working state unit which converts an AC voltage which is generated by a phase difference between a main AC voltage and an auxiliary AC voltage which are respectively fed back from the main transformer and the auxiliary transformer into a simulation DC voltage, a protection controller which determines the generated errors during the working period of the lamps according to the simulation DC voltage and outputs the working error signal when the error is generated, and a lamp driving controller which responds to the working error signal to stop the driving of the main driver and the auxiliary driver.

Description

technical field [0001] The present invention relates to a liquid crystal display (LCD) device, and more particularly, to a backlight driving device of the LCD device and a driving method thereof adapted to automatically shield voltage supply when an error occurs during lamp operation. Background technique [0002] Generally, a liquid crystal display (LCD) device controls light transmittance of a liquid crystal cell according to a video signal to display an image. An advantage of an active matrix type LCD device is that a moving image can be realized because the switching device actively controls each liquid crystal cell. Thin film transistors (hereinafter referred to as "TFTs") are mainly used as switching devices in active matrix type LCD devices. [0003] FIG. 1 is an equivalent circuit diagram of a pixel of an LCD device according to the related art. [0004] Referring to FIG. 1 , the LCD converts digital input data into analog data voltages based on a gamma reference v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G09G3/34G09G3/20G02F1/133G02F1/13357G09F9/35
CPCG02F1/133604G09G3/3406G09G2330/04H05B41/36
Inventor 李泰旭
Owner LG DISPLAY CO LTD