KR20000060041A - LCD apparatus for preventing an wave-type display - Google Patents
LCD apparatus for preventing an wave-type display Download PDFInfo
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- KR20000060041A KR20000060041A KR1019990008067A KR19990008067A KR20000060041A KR 20000060041 A KR20000060041 A KR 20000060041A KR 1019990008067 A KR1019990008067 A KR 1019990008067A KR 19990008067 A KR19990008067 A KR 19990008067A KR 20000060041 A KR20000060041 A KR 20000060041A
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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
- G02F1/1345—Conductors connecting electrodes to cell terminals
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2011—Display of intermediate tones by amplitude modulation
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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
Abstract
Description
본 발명은 물결 현상 방지를 위한 액정표시장치에 관한 것으로서, 더욱 상세하게는 인버터의 출력 주파수를 액정 샤시의 패널에 공급되는 수평동기신호의 주파수에 동기시킴으로써 화소의 데이터 신호가 평균적으로 균등하고 라인별로 휘도변화를 방지함으로써 물결 현상을 방지하는 액정표시장치에 관한 것이다.The present invention relates to a liquid crystal display device for preventing a wave phenomenon, and more particularly, by synchronizing the output frequency of the inverter with the frequency of the horizontal synchronizing signal supplied to the panel of the liquid crystal chassis, the data signals of the pixels are equally averaged and line by line. A liquid crystal display device which prevents a wave phenomenon by preventing a change in luminance.
통상, 액정표시장치는 액정샤시와 인쇄회로기판들 및 백라이트 어셈블리가 조합되어서 구성되고, 액정샤시는 액정패널을 지지하는 구성을 가지며 액정패널에는 전기적인 동작을 위한 부품을 실장하는 인쇄회로기판들이 구성되며, 백라이트 어셈블리는 액정샤시의 일면에서 광을 공급하도록 구성된다. 그리고, 백라이트 어셈블리의 구동을 위한 교류전원을 공급하는 인버터가 추가로 구성된다.In general, a liquid crystal display device is configured by combining a liquid crystal chassis, printed circuit boards, and a backlight assembly, a liquid crystal chassis supporting a liquid crystal panel, and printed circuit boards on which a component for electric operation is mounted. The backlight assembly is configured to supply light from one surface of the liquid crystal chassis. In addition, an inverter for supplying AC power for driving the backlight assembly is further configured.
도 1을 참조하면 액정표시장치는 액정패널(12)이 조립된 액정샤시(10)에 인버터(14)가 전류를 공급하도록 구성된다. 여기에서 인버터(14)는 액정샤시(10)에 포함된 백라이트 어셈블리에 교류 전원을 공급하며, 30KHz 내지 70 KHz 범위의 주파수를 갖는 전압을 공급한다.Referring to FIG. 1, the liquid crystal display device is configured such that the inverter 14 supplies current to the liquid crystal chassis 10 in which the liquid crystal panel 12 is assembled. The inverter 14 supplies AC power to the backlight assembly included in the liquid crystal chassis 10 and supplies a voltage having a frequency in the range of 30 KHz to 70 KHz.
그리고, 액정패널(12)에는 매트릭스 형상으로 화소가 형성되며, 화소는 박막트랜지스터와 스토리지 캐패시터 및 액정 캐패시터를 기본적으로 포함하여 구성되고, 이때 액정 캐패시터는 화소전극과 대향전극 사이에 소정 유전율을 갖는 액정을 포함하여 구성된다. 그리고, 각 화소에는 수평신호와 수직신호가 인가됨으로써 동작되며, 수평신호는 약 48KHz의 일정한 주파수를 갖는다.In the liquid crystal panel 12, pixels are formed in a matrix, and the pixels basically include a thin film transistor, a storage capacitor, and a liquid crystal capacitor, wherein the liquid crystal capacitor is a liquid crystal having a predetermined dielectric constant between the pixel electrode and the counter electrode. It is configured to include. Each pixel is operated by applying a horizontal signal and a vertical signal, and the horizontal signal has a constant frequency of about 48 KHz.
그리고, 대향전극은 공통단자로 구성되는 공통전극으로서 통상 패널의 상판 즉 사용자가 바라보는 면에 구성되며, 소정 재질의 도체로 전체면에 도포됨으로써 제작된다. 이때 대향전극은 도체이므로 일정한 전기적 저항을 가지며 주변에 위치되는 다른 도체들과 기생 캐패시턴스를 형성한다.The counter electrode is a common electrode composed of a common terminal, and is usually formed on an upper plate of a panel, that is, a surface viewed by a user, and is manufactured by coating the entire surface with a conductor of a predetermined material. At this time, since the counter electrode is a conductor, it has a constant electrical resistance and forms parasitic capacitance with other conductors located in the periphery.
이러한 기생 캐패시턴스는 상술한 인버터로부터 공급되는 고주파 전원에 의하여 발생되는 방사 노이즈의 영향을 받으며, 그 결과 공통전극의 전위가 왜곡되고, 액정에 인가되는 전압을 변화시킴으로써 화소 별로 휘도 차이를 발생시켜서 패널 전면적으로 물결이 발생되는 현상이 유발된다. 특히, 물결 현상은 인버터의 주파수와 수평신호의 주파수가 틀리면 심각하게 발생된다.The parasitic capacitance is affected by the radiation noise generated by the high frequency power supplied from the above-described inverter. As a result, the potential of the common electrode is distorted, and the luminance difference is generated for each pixel by changing the voltage applied to the liquid crystal. As a result, waves are generated. In particular, the wave phenomenon occurs seriously when the frequency of the inverter and the frequency of the horizontal signal are different.
즉, 정상적인 경우 화소에 인가되는 데이터는 도 2a와 같으나, 수평신호의 주파수와 다른 주파수를 갖는 인버터 출력 신호의 영향을 받으면 도 2b와 같이 공통전극의 전위가 흔들리면서 전체적인 데이터의 레벨이 왜곡되고, 라인별 휘도가 불균일한 물결 현상이 발생된다.That is, in the normal case, the data applied to the pixel is the same as that of FIG. 2A, but when the inverter output signal having a frequency different from the horizontal signal is affected, the potential of the common electrode is shaken as shown in FIG. 2B, and the overall data level is distorted. Waves with non-uniform brightness are generated.
그러므로, 전술한 바와 같은 물결현상이 발생되고, 그에 따라서 제품의 신뢰성에 심각한 영향을 미치는 문제점이 발생된다.Therefore, the wave phenomenon as described above occurs, and accordingly a problem that seriously affects the reliability of the product occurs.
본 발명의 목적은 액정패널의 각 화소에 인가되는 수평 신호를 기준으로 인버터의 출력을 동기시킴으로써 공통전압의 변화에 수평신호가 능동적으로 변화되어서 라인별 휘도가 균일해지므로 물결 현상이 발생되는 것을 방지함에 있다.An object of the present invention is to synchronize the output of the inverter on the basis of the horizontal signal applied to each pixel of the liquid crystal panel, the horizontal signal is actively changed to the change of the common voltage, so that the luminance of each line is uniform, thereby preventing the occurrence of wave phenomenon. It is in a ship.
본 발명의 또다른 목적들은 다음의 상세한 설명과 첨부된 도면으로부터 보다 명확해질 것이다.Other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.
도 1은 종래의 액정표시장치의 액정 샤시와 인버터의 구성을 나타내는 도면1 is a view showing the configuration of a liquid crystal chassis and an inverter of a conventional liquid crystal display device.
도 2a는 정상적인 데이터 신호를 나타내는 파형도2A is a waveform diagram showing a normal data signal
도 2b는 물결 현상이 발생되는 데이터 신호를 나타내는 파형도2B is a waveform diagram illustrating a data signal in which a wave phenomenon occurs
도 3은 본 발명에 따른 물결현상 방지를 위한 액정표시장치3 is a liquid crystal display for preventing a wave phenomenon according to the present invention
도 4는 본 발명에 따른 물결현상 방지를 위한 수평동기신호에 동기시킨 인버터의 출력을 나타내는 파형도4 is a waveform diagram showing an output of an inverter synchronized to a horizontal synchronous signal for preventing wave phenomenon according to the present invention.
본 발명에 따른 물결 현상 방지를 위한 액정표시장치는 액정패널과 인쇄회로기판을 포함하고 백라이트 어셈블리가 설치되는 액정샤시와, 상기 인쇄회로기판으로부터 상기 액정패널의 각 화소에 인가되는 수평신호의 주파수와 동일한 주파수를 갖는 수평동기신호를 출력하는 그래픽 컨트롤러 및 상기 수평동기신호의 주파수에 동기된 교류전압 출력을 갖는 인버터를 구비하여 이루어진다.The liquid crystal display device for preventing the wave phenomenon according to the present invention includes a liquid crystal chassis including a liquid crystal panel and a printed circuit board and having a backlight assembly installed thereon, and a frequency of a horizontal signal applied to each pixel of the liquid crystal panel from the printed circuit board. And a graphic controller for outputting a horizontal synchronous signal having the same frequency and an inverter having an AC voltage output synchronized with the frequency of the horizontal synchronous signal.
이하, 본 발명에 따른 바람직한 실시예에 대하여 첨부 도면을 참조하여 상세히 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 3를 참조하면, 본 발명에 따른 실시예는 액정샤시(30)에 액정패널(32)이 구성되며, 액정샤시(30)에 포함된 백라이트 어셈블리(도시되지 않음)에 교류 전원을 공급하도록 인버터(34)가 구성된다. 그리고 그래픽 컨트롤러(36)가 수평동기신호를 인버터(34)에 인가되도록 구성된다.Referring to FIG. 3, in the embodiment of the present invention, the liquid crystal panel 32 is configured in the liquid crystal chassis 30, and the inverter is configured to supply AC power to a backlight assembly (not shown) included in the liquid crystal chassis 30. 34 is configured. The graphic controller 36 is configured to apply the horizontal synchronization signal to the inverter 34.
전술한 바에 있어서 인버터(34)는 그래픽 컨트롤러(36)로부터 제공되는 수평동기신호의 주파수에 동기되어서 출력을 가지며, 그에 따라서 인버터(34)의 출력 주파수는 그래픽 컨트롤러(36)로부터 출력되는 수평동기신호의 주파수와 일치된다.As described above, the inverter 34 has an output in synchronization with the frequency of the horizontal synchronous signal provided from the graphic controller 36, so that the output frequency of the inverter 34 is the horizontal synchronous signal output from the graphic controller 36. Is matched to the frequency of
수평동기신호는 액정패널(32)의 각 화소에 인가되는 수평신호의 주파수와 동일하며, 결국 수평동기신호의 주파수가 48MHz라면 인버터(34)의 출력 주파수는 48KHz로 조정된다.The horizontal synchronizing signal is equal to the frequency of the horizontal signal applied to each pixel of the liquid crystal panel 32. Consequently, if the frequency of the horizontal synchronizing signal is 48 MHz, the output frequency of the inverter 34 is adjusted to 48 KHz.
전술한 구성에 있어서, 액정패널(32)는 상판이 컬러필터(도시되지 않음)이고 하판이 TFT기판(도시되지 않음)으로 제작되며, 컬러필터와 TFT기판은 상하로 쇼트 패드를 통하여 공통전극라인이 연결되고, 쇼트패드는 액정패널(32)의 구동을 위한 구동신호를 출력하도록 구성되는 드라이브 집적회로(도시되지 않음)를 통하여 공통전극의 전압을 조절하는 회로에 연결된다.In the above-described configuration, the liquid crystal panel 32 has a top plate made of color filters (not shown) and a bottom plate made of TFT substrates (not shown), and the color filter and TFT substrates are formed on the common electrode line through short pads. The short pad is connected to a circuit for regulating the voltage of the common electrode through a drive integrated circuit (not shown) configured to output a driving signal for driving the liquid crystal panel 32.
그리고, 공통전극과 인버터(34)의 사이에는 기생 캐패시터가 등가적으로 형성되며, 이 커플링된 캐패시터를 통하여 공통전극의 전압이 인버터(34)의 출력에 영향을 받는다.A parasitic capacitor is equivalently formed between the common electrode and the inverter 34, and the voltage of the common electrode is influenced by the output of the inverter 34 through the coupled capacitor.
액정패널(32)의 휘도를 결정하는 것은 데이터 전압과 공통전압의 전위차이다. 본 발명은 도 4와 같이 수평동기신호 H에 인버터(34)의 출력 I를 동기시킨다.The luminance of the liquid crystal panel 32 is determined by the potential difference between the data voltage and the common voltage. The present invention synchronizes the output I of the inverter 34 with the horizontal synchronizing signal H as shown in FIG.
그러면, 상술한 바와 같이 인버터(34)의 전압의 영향을 받은 공통전압이 각 수평라인에 동일한 양으로 발생되고, 그에 따라서 라인별 휘도차가 상쇄된다. 즉, 라인별로 평균적으로 동일한 전위차가 형성되므로 그에 따른 휘도차가 없어진다.Then, as described above, the common voltage affected by the voltage of the inverter 34 is generated in the same amount in each horizontal line, and the luminance difference for each line is canceled accordingly. That is, since the same potential difference is formed on a line-by-line basis, there is no luminance difference.
즉, 수평신호와 인버터의 주파수가 동일하게됨에 따라서 평균적인 데이터 신호의 라인별 변화가 발생되지 않으므로 휘도가 균일해지고, 그에 따라서 물결 현상이 방지된다.That is, since the horizontal signal and the frequency of the inverter are the same, since the line-by-line change of the average data signal does not occur, the luminance is uniform, and thus the wave phenomenon is prevented.
이상에서 상세히 설명한 바와 같이, 본 발명은 바람직한 실시예에 대해 상세히 기술되었지만, 본 발명이 속하는 기술 분야에 있어서 통상의 지식을 가진 사람이라면, 본 발명의 정신 및 범위를 벗어나지 않으면서 본 발명을 여러 가지로 변형 또는 변경하여 실시할 수 있음을 알 수 있을 것이다.As described in detail above, the present invention has been described in detail with respect to preferred embodiments, but those skilled in the art to which the present invention pertains, various embodiments of the present invention without departing from the spirit and scope of the present invention It will be appreciated that the present invention may be modified or modified as described above.
따라서, 본 발명에 의하면 휘도를 결정하는 데이터 신호의 전위가 평균적으로 균등해지므로 라인별 휘도차가 없어지고, 물결 현상이 방지됨으로써 제품의 신뢰성이 극대화되는 효과가 있다.Therefore, according to the present invention, since the potential of the data signal for determining the luminance is equalized on average, the luminance difference per line is eliminated, and the wave phenomenon is prevented, thereby maximizing the reliability of the product.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7612756B2 (en) | 2003-11-21 | 2009-11-03 | Samsung Electronics Co., Ltd. | Apparatus and method of driving light source for image display device and image display device having the same |
| US8144106B2 (en) | 2003-04-24 | 2012-03-27 | Samsung Electronics Co., Ltd. | Liquid crystal display and driving method thereof |
| US8723780B2 (en) | 2002-09-04 | 2014-05-13 | Samsung Display Co., Ltd. | Inverter for liquid crystal display |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100920372B1 (en) * | 2002-11-22 | 2009-10-07 | 엘지디스플레이 주식회사 | Method and apparatus for driving of liquid crystal display |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0113522Y1 (en) * | 1994-07-27 | 1998-04-13 | Lg Electronics Inc | Backlight delay device of liquid crystal display device |
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1999
- 1999-03-11 KR KR1019990008067A patent/KR100617877B1/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8723780B2 (en) | 2002-09-04 | 2014-05-13 | Samsung Display Co., Ltd. | Inverter for liquid crystal display |
| US8144106B2 (en) | 2003-04-24 | 2012-03-27 | Samsung Electronics Co., Ltd. | Liquid crystal display and driving method thereof |
| US7612756B2 (en) | 2003-11-21 | 2009-11-03 | Samsung Electronics Co., Ltd. | Apparatus and method of driving light source for image display device and image display device having the same |
| EP1533783B1 (en) * | 2003-11-21 | 2018-11-28 | Samsung Display Co., Ltd. | Apparatus and method for driving the light source of an image display device and image display device having the same |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100617877B1 (en) | 2006-09-05 |
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