KR200357947Y1 - Frequency variable device of backlight inverter - Google Patents
Frequency variable device of backlight inverter Download PDFInfo
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- KR200357947Y1 KR200357947Y1 KR2019980025138U KR19980025138U KR200357947Y1 KR 200357947 Y1 KR200357947 Y1 KR 200357947Y1 KR 2019980025138 U KR2019980025138 U KR 2019980025138U KR 19980025138 U KR19980025138 U KR 19980025138U KR 200357947 Y1 KR200357947 Y1 KR 200357947Y1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
- H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
- H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation
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Abstract
본 고안은 액정표시소자에 있어서 백라이트를 점등하기 위하 인버터의 주파수가변장치에 관한 것이다.The present invention relates to a frequency variable device of the inverter for lighting the backlight in the liquid crystal display device.
본 고안은 액정표시소자의 백라이트를 구동하기 위한 인버터의 주파수 가변장치에 있어서, 상기 인버터의 공진 주파수를 발생하기 위한 공진주파수 발생부와; 상기 공진주파수 발생부의 출력을 증폭시켜 주기위한 증폭부와; 상기 증폭부의 출력에 의해 상기 인버터를 구동하기 위한 트랜시포머로 이루어진다. 상기 공진주파수 발생부는 전원전압을 입력하여 가변시켜주기 위한 전압가변수단과; 상기 전압가변수단에 의해 가변된 전압에 비례하는 발진 주파수를 발생하는 전압제어발진기와; 상기 전압제어발진기로부터 발생되는 발진 주파수에 따라서 공진주파수를 상기 증폭부로 발생하는 주파수 발생수단으로 이루어진다.The present invention provides a frequency varying device of an inverter for driving a backlight of a liquid crystal display device, comprising: a resonance frequency generator for generating a resonance frequency of the inverter; An amplifier for amplifying the output of the resonance frequency generator; By the output of the amplification unit is made of a transformer for driving the inverter. The resonant frequency generator comprises a voltage variable stage for inputting and varying a power supply voltage; A voltage controlled oscillator for generating an oscillation frequency proportional to the voltage varied by the voltage variable stage; And a frequency generating means for generating a resonance frequency to the amplifier according to the oscillation frequency generated from the voltage controlled oscillator.
Description
본 고안은 액정표시소자에 있어서 백라이트를 점등하는 데 사용되는 인버터의 주파수를 용이하게 가변시켜 줄 수 있는 액정표시소자의 백라이트용 인버터의 주파수 가변장치에 관한 것이다.The present invention relates to a frequency variable device of an inverter for backlight of a liquid crystal display device that can easily vary the frequency of the inverter used to light the backlight in the liquid crystal display device.
일반적으로 액정표시소자의 백라이트를 점등하는 데 사용되는 인버터의 경우, 인버터의 공진 주파수와 액정표시소자의 인터페이스신호간의 간섭현상에 의해 디스플레이상 노이즈가 발생하게 된다. 이와 같이 인버터의 공진 주파수는 화면품위에 매우 중요한 영향을 미치게 된다.In general, an inverter used to light a backlight of a liquid crystal display device generates noise on the display due to interference between the resonance frequency of the inverter and an interface signal of the liquid crystal display device. In this way, the resonant frequency of the inverter has a very important effect on the screen quality.
종래에는 인버터의 공진 주파수를 트랜스포머의 리액터(L)와 콘덴서(C)에 의해 가변시켜 주었기 때문에 정확하게 주파수를 가변시켜주는 것이 어렵고, 주파수를 가변하기 위한 콘덴서(C)의 빈번한 교체로 인하여 접촉불량이 발생하며, 트랜스포머의 교체가 어려워 리액터의 튜닝이 어려운 문제점이 있었다.In the related art, since the resonant frequency of the inverter is changed by the reactor (L) and the capacitor (C) of the transformer, it is difficult to accurately change the frequency. It occurred, and the transformer is difficult to replace, there was a problem that the tuning of the reactor is difficult.
본 고안은 상기한 바와같은 문제점을 해결하기 위한 것으로서, 인버터의 특성에 따라 인버터의 공진주파수와 액정표시소자의 인터페이스신호와의 간섭현상(interference)을 일으키지 않는 공진주파수를 용이하게 선택할 수 있는 액정표시소자의 백라이트용 인버터의 주파수 가변장치를 제공하는 데 그 목적이 있다.The present invention is to solve the problems described above, according to the characteristics of the inverter liquid crystal display which can easily select the resonant frequency that does not cause interference between the resonant frequency of the inverter and the interface signal of the liquid crystal display device It is an object of the present invention to provide a frequency variable device of an inverter for a backlight of a device.
도 1은 본 고안의 실시예에 따른 액정표시소자의 백라이트용 인버터의 주파수 가변장치의 블럭도,1 is a block diagram of a frequency variable device of an inverter for backlight of a liquid crystal display device according to an embodiment of the present invention;
도 2는 도 1의 인버터의 주파수 가변장치에 있어서, 공진 주파수 발생부의 상세도,2 is a detailed view of a resonant frequency generator in the frequency variable device of the inverter of FIG. 1;
도 3는 도 2의 주파수 가변장치의 공진주파수 발생부에 있어서, 전압제어발진기의 스펙트럼도,3 is a spectrum diagram of a voltage controlled oscillator in a resonance frequency generator of the frequency variable device of FIG.
(도면의 주요 부분에 대한 부호의 설명)(Explanation of symbols for the main parts of the drawing)
10 : 공진 주파수 발생부 20 : 증폭기10: resonant frequency generator 20: amplifier
30 : 인버터 11 : 전압가변수단30: inverter 11: voltage variable stage
12 : 전압제어발진기 13 : 주파수 발생수단12 voltage controlled oscillator 13 frequency generating means
상기한 본 고안의 목적을 달성하기 위하여, 본 고안은 액정표시소자의 백라이트를 구동하기 위한 인버터의 주파수 가변장치에 있어서, 상기 인버터의 공진 주파수를 발생하기 위한 공진주파수 발생부와; 상기 공진주파수 발생부의 출력을 증폭시켜 주기위한 증폭부와; 상기 증폭부의 출력에 의해 상기 인버터를 구동하기 위한 트랜시포머로 이루어지는 것을 특징으로 하는 백라이트용 인버터의 주파수 가변장치를 제공하는 것을 특징으로 한다.In order to achieve the above object of the present invention, the present invention is a frequency variable device of the inverter for driving the backlight of the liquid crystal display device, the resonance frequency generator for generating a resonance frequency of the inverter; An amplifier for amplifying the output of the resonance frequency generator; It is characterized by providing a frequency inverter of the inverter for backlight, characterized in that the output of the amplifier consisting of a transformer for driving the inverter.
본 발명의 실시예에 있어서, 상기 공진주파수 발생부는 전원전압을 입력하여 가변시켜주기 위한 전압가변수단과; 상기 전압가변수단에 의해 가변된 전압에 비례하는 발진 주파수를 발생하는 전압제어발진기와; 상기 전압제어발진기로부터 발생되는 발진 주파수에 따라서 공진주파수를 상기 증폭부로 발생하는 주파수 발생수단으로 이루어진다.In an embodiment of the present invention, the resonant frequency generator comprises: a voltage variable stage for inputting and varying a power supply voltage; A voltage controlled oscillator for generating an oscillation frequency proportional to the voltage varied by the voltage variable stage; And a frequency generating means for generating a resonance frequency to the amplifier according to the oscillation frequency generated from the voltage controlled oscillator.
본 발명의 실시예에 있어서, 주파수 발생수단은 상기 전압제어 발진기로부터 발생되는 발진주파수를 입력하여 공진주파수를 발생하기 위한 프로그램 카운터와 밴드패스 필터로 이루어진다.In an embodiment of the present invention, the frequency generating means comprises a program counter and a band pass filter for generating the resonance frequency by inputting the oscillation frequency generated from the voltage controlled oscillator.
본 발명의 실시예에 있어서, 상기 주파수 발생수단은 상기 전압제어발진기로부터 수십MHz 의 발진주파수가 발생되는 경우에는 프로그램 카운터를 통해 일정시간마다 샘플링하여 수KHz 로 주파수를 다운시켜 공진주파수를 발생하고, 상기 전압제어 발진기로부터 수KHz 발진 주파수가 발생되는 경우에는 전압제어발진기의 발진파형중 원하는 발진파형을 밴드패스필터를 통해 필터링하여 원하는 수십KHz 의 공진주파수를 발생하는 것을 특징으로 한다.In an embodiment of the present invention, when the oscillation frequency of several tens of MHz is generated from the voltage controlled oscillator, the frequency generating means generates a resonant frequency by sampling every predetermined time through a program counter and lowering the frequency to several KHz. When a several KHz oscillation frequency is generated from the voltage controlled oscillator, a desired oscillation waveform of the oscillation waveform of the voltage controlled oscillator is filtered through a band pass filter to generate a desired frequency of several tens of KHz.
이하 첨부한 도면에 의거하여 본 고안의 바람직한 실시예를 자세히 설명하도록 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 고안의 실시예에 따른 액정표시소자의 백라이트용 인버터의 주파수 가변장치의 블록도를 도시한 것이고, 도 2는 도 1의 백라이트용 인버터의 주파수 가변장치에 있어서, 공진 주파수 발생부의 상세 블록도를 도시한 것이다.1 is a block diagram of a frequency variable device of a backlight inverter of a liquid crystal display device according to an embodiment of the present invention, Figure 2 is a detail of the resonant frequency generator in the frequency variable device of the backlight inverter of Figure 1 A block diagram is shown.
도 1을 참조하면, 본 고안의 실시예에 따른 액정표시소자의 백라이트용 인버터의 주파수 가변장치는 인버터의 공진 주파수를 발생하기 위한 공진주파수 발생부(10)와, 상기 공진주파수 발생부(10)의 출력을 증폭시켜 주기위한 증폭부(20)와, 상기 증폭부(20)의 출력을 냉음극 형광램프(도면상에는 도시되지 않음)로 제공하여 냉음극 형광램프를 구동하기 위한 트랜시포머(30)로 이루어진다.Referring to FIG. 1, a frequency variable device of a backlight inverter of a liquid crystal display device according to an exemplary embodiment of the present invention includes a resonance frequency generator 10 and a resonance frequency generator 10 for generating a resonance frequency of an inverter. An amplifier 20 for amplifying the output of the amplifier and a transformer for driving the cold cathode fluorescent lamp by providing the output of the amplifier 20 to a cold cathode fluorescent lamp (not shown). )
도 2를 참조하면, 주파수 가변장치에 있어서, 공진주파수 발생부(10)는 전원전압(VDD)을 입력하여 전압을 가변시켜주기 위한, 전압 디바이더로 이루어진 전압가변수단(11)과, 상기 전압가변수단(11)에 의해 가변된 전압에 비례하는 발진 주파수를 발생하는 전압제어발진기(12)와, 상기 전압제어발진기(12)로부터 발생되는 발진 주파수를 입력하여 공진주파수를 상기 증폭부(20)로 발생하는 주파수 발생수단(13)으로 이루어진다.Referring to FIG. 2, in the frequency variable device, the resonant frequency generator 10 inputs a power supply voltage VDD to change a voltage, and includes a voltage variable stage 11 formed of a voltage divider and the voltage variable. A voltage controlled oscillator 12 generating an oscillation frequency proportional to the voltage varied by the means 11 and an oscillation frequency generated from the voltage controlled oscillator 12 and inputting a resonance frequency to the amplifying unit 20. It consists of the frequency generating means 13 to generate.
주파수 발생수단(13)은 프로그램 카운터와 밴드패스필터로 이루어져서, 전압제어발진기(12)로부터 수십 MHz 발진 주파수가 발생되는 경우에는 프로그램 카운터를 이용하여 상기 전압제어 발진기(12)로부터의 발진주파수를 분주하여 원하는 공진주파수를 발생한다. 한편, 전아제어 발진기(12)로부터 수KHz 발진주파수가 발생되는 경우에는 밴드패스를 이용하여 수십KHz 내지 수백KHz 의 공진주파수를 발생하게 된다.The frequency generating means 13 is composed of a program counter and a band pass filter, and when the oscillation frequency of several tens of MHz is generated from the voltage controlled oscillator 12, the oscillation frequency from the voltage controlled oscillator 12 is divided using a program counter. To generate the desired resonance frequency. On the other hand, when a few KHz oscillation frequency is generated from the pre-controlled oscillator 12, a resonant frequency of several tens of KHz to several hundred KHz is generated using a band pass.
상기한 바와같은 구성을 갖는 본 고안의 백라이트용 인버터의 주파수 가변장치의 동작을 설명하면 다음과 같다.Referring to the operation of the frequency variable device of the backlight inverter of the present invention having the configuration as described above are as follows.
공진주파수 발생부(10)는 공진주파수를 발생하여 증폭부(20)로 제공한다.즉, 상기 공진 주파수 발생부(10)는 원하는 공진주파수에 따라 전압가변수단(11)을 통해 전원전압(VDD)을 가변시키고, 가변된 전압을 전압제어발진기(12)로 제공한다. 상기 전압제어 발진기(12)는 전압가변수단(11)에 의해 가변된 전압에 비례하는 발진주파수를 발생한다.The resonance frequency generator 10 generates a resonance frequency and provides it to the amplifier 20. That is, the resonance frequency generator 10 supplies the power supply voltage VDD through the voltage variable stage 11 according to a desired resonance frequency. ) And provide the variable voltage to the voltage controlled oscillator 12. The voltage controlled oscillator 12 generates an oscillation frequency proportional to the voltage varied by the voltage variable stage 11.
주파수 발생수단(13)은 전압제어 발진기(12)로부터 발생되는 발진 주파수에 따라 공진주파수를 증폭부(20)로 발생하는데, 전압제어발진기(12)가 수십MHz 단위로 발진하는 경우에는 주파수 발생수단(13)의 프로그램 카운터를 통해 일정시간마다 샘플링하여 수KHz fh 주파수를 다운(down)시켜 원하는 공진주파수를 발생한다.The frequency generator 13 generates the resonance frequency to the amplifier 20 according to the oscillation frequency generated from the voltage controlled oscillator 12. When the voltage controlled oscillator 12 oscillates in units of several tens of MHz, the frequency generator means Sampling every predetermined time through the program counter (13), down several KHz fh frequency to generate the desired resonance frequency.
한편, 전압제어 발진기(12)가 수KHz 단위로 발진하는 경우에는 도 3에 도시된 바와같이 전압제어 발진기(12)의 발진 파형스펙트럼중에서 주파수 발생수단(13)의 밴드패스필터를 통해 원하는 발진파형을 필터링하여 원하는 수십KHz 의 공진주파수를 발생하게 된다. 증폭부(20)는 상기한 바와같은 공진 주파수 발생부(10)로부터 발생되는 공진 주파수를 증폭한 다음 트랜스포머(30)를 통해 냉음극 형광램프 즉, 백라이트에 인가하여 백라이트를 구동시켜 주게 된다.On the other hand, when the voltage controlled oscillator 12 oscillates in units of several KHz, a desired oscillation waveform is generated through the band pass filter of the frequency generating means 13 among the oscillation waveform spectrum of the voltage controlled oscillator 12 as shown in FIG. 3. This filter generates the desired resonant frequency of several tens of KHz. The amplifier 20 amplifies the resonance frequency generated from the resonance frequency generator 10 as described above and then applies the cold cathode fluorescent lamp, that is, the backlight through the transformer 30 to drive the backlight.
이상에서 자세히 설명된 바와 같이, 상술한 바와 같은 본 발명의 인버터의 주파수 가변장치에 따르면, 전압제어 발진기로부터 발생되는 발진주파수를 프로그램 카운터 또는 밴드패스필터를 통해 조절하여 줌으로써, 백라이트와 LCD 인터페이스신호간의 간섭현상에 의한 노이즈 문제를 해결할 수 있다.As described in detail above, according to the frequency variable device of the inverter of the present invention as described above, by adjusting the oscillation frequency generated from the voltage controlled oscillator through a program counter or a band pass filter, between the backlight and the LCD interface signal The noise problem caused by the interference phenomenon can be solved.
기타, 본 발명은 그 요지를 일탈하지 않는 범위에서 다양하게 변경하여 실시할 수 있다.In addition, this invention can be implemented in various changes within the range which does not deviate from the summary.
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