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Liquid crystal display backlight inverter

A liquid crystal display, inverter technology, applied in static indicators, optics, light sources, etc., can solve the problems of error signal S13 increase, damage to fluorescent lamps, etc.

Inactive Publication Date: 2007-10-10
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, in a conventional LCD backlight inverter, during the initial drive, the error signal S13 will suddenly increase due to a sudden increase in PWM duty
This causes excessive voltage or current to be supplied to the fluorescent lamp, thereby damaging the fluorescent lamp

Method used

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  • Liquid crystal display backlight inverter
  • Liquid crystal display backlight inverter
  • Liquid crystal display backlight inverter

Examples

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Embodiment Construction

[0025] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, this invention may be embodied in different forms and should not be construed as limited to the embodiments described herein. The description of the embodiments of the present invention is for the purpose of fully illustrating the present invention to those skilled in the art. In the drawings, the same or similar components having substantially the same function and structure are assigned the same reference numerals.

[0026] FIG. 2 is a circuit diagram illustrating a liquid crystal display (LCD) backlight inverter for generating a pulse width modulation (PWM) signal according to the present invention.

[0027] As shown in FIG. 2, the LCD backlight inverter according to the present invention includes: a soft starter 230 for generating a gradually increasing soft-start reference voltage S22 when driving power is initially supplied...

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Abstract

An LCD backlight inverter includes a soft starter for generating a soft-start reference voltage gradually increasing as the driving power begins to be supplied. The LCD backlight inverter also includes a first error detector for receiving a first feedback voltage indicating the magnitude of driving current of the lamp and for comparing a smaller value out of a predetermined first reference voltage and the soft-start reference voltage with the first feedback voltage to generate a first error signal corresponding to the difference between the smaller value and the soft-start reference voltage. The LCD backlight inverter further includes a pulse width modulation comparator for comparing the first error signal and a triangle wave oscillation signal to output the pulse width modulation control signal with a predetermined duty ratio. The LCD backlight inverter prevents application of over-current and over-voltage to the LCD backlight to prolong the lifetime of the backlight.

Description

[0001] Related Application Cross Reference [0002] This application claims priority from Korean Patent Application No. 2006-30568 filed with the Korean Intellectual Property Office on Apr. 4, 2006, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a liquid crystal display (LCD) backlight inverter, and more particularly, to an LCD backlight inverter capable of soft start, so that the initial current and voltage can be controlled during the initial drive of the LCD backlight Provided stably, preventing application of overcurrent or overvoltage that would damage the LCD backlight. Background technique [0004] In general, display devices for computer monitors, TVs, etc. include those capable of emitting light independently, such as organic light emitting displays (OLEDs), vacuum fluorescent displays (VFDs), field emission displays (FEDs), and plasma display panels (PDP), and those display devices that cannot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G02F1/13357H05B41/26G09G3/34G02F1/1335
CPCH05B41/386
Inventor 申相哲闵丙云河昌佑孔正喆
Owner SAMSUNG ELECTRO MECHANICS CO LTD