KR100520377B1 - Liquid crystal display - Google Patents
Liquid crystal display Download PDFInfo
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- KR100520377B1 KR100520377B1 KR1019980024229A KR19980024229A KR100520377B1 KR 100520377 B1 KR100520377 B1 KR 100520377B1 KR 1019980024229 A KR1019980024229 A KR 1019980024229A KR 19980024229 A KR19980024229 A KR 19980024229A KR 100520377 B1 KR100520377 B1 KR 100520377B1
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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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
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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
- G02F1/13452—Conductors connecting driver circuitry and terminals of panels
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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
- G02F1/13458—Terminal pads
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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
- G02F1/133337—Layers preventing ion diffusion, e.g. by ion absorption
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
본 발명은 상부기판 측에 발생되는 EMI 및 노이즈를 제거할 수 있는 액정표시장치를 개시한다. 개시된 본 발명의 액정표시장치는, 대향하는 하부기판과 상부 기판; 상기 하부기판의 내측면에 매트릭스 형태로 배치된 화소전극; 상기 상부기판의 내측면에 배치된 컬러필터; 상기 컬러필터 표면에 배치되며, 하부기판의 접지단과 연결되는 제1상대전극; 상기 제1상대전극 표면에 배치된 절연막; 및 상기 절연막 표면에 배치되며, 공통신호가 인가되어 상기 화소전극과 함께 전계를 형성하는 제2상대전극;을 포함하는 것을 특징으로 한다.The present invention discloses a liquid crystal display device capable of removing EMI and noise generated on the upper substrate side. The disclosed liquid crystal display device includes an opposing lower substrate and an upper substrate; A pixel electrode arranged in a matrix form on an inner surface of the lower substrate; A color filter disposed on an inner surface of the upper substrate; A first relative electrode disposed on a surface of the color filter and connected to the ground terminal of the lower substrate; An insulating film disposed on a surface of the first relative electrode; And a second relative electrode disposed on the surface of the insulating layer and having a common signal applied thereto to form an electric field together with the pixel electrode.
Description
본 발명은 액정표시장치에 관한 것으로, 보다 구체적으로는 상부기판 측에 발생되는 EMI 및 노이즈를 제거할 수 있는 액정표시장치에 관한 것이다.The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of removing EMI and noise generated on the upper substrate side.
일반적으로 액정표시장치는, 도 1에 도시된 바와 같이, 액정패널(1)과, 상기액정패널(1)의 선택된 단부에 부착되는 게이트 및 데이터 인쇄회로기판(Printed Circuit Board; 이하, PCB)(2,3)과, 액정패널(1)과 PCB(2,3)을 연결하는 TCP(5; Tape Carrier Package) 및 광원인 백라이트(도시되지 않음)를 포함한다.Generally, as shown in FIG. 1, a liquid crystal display device includes a liquid crystal panel 1, a gate and a data printed circuit board (PCB) attached to a selected end of the liquid crystal panel 1 ( 2, 3, and a TCP (Tape Carrier Package) 5 for connecting the liquid crystal panel 1 and the PCBs 2, 3 and a backlight (not shown) which is a light source.
여기서, 액정패널(1)은 게이트버스라인, 데이터버스라인 및 화소전극이 구비된 하부기판(1a)과, 컬러필터 및 상대전극이 형성된 상부기판(1b), 및 상기 하부기판(1a)과 상부기판(1b) 사이에 개재되는 액정(도시되지 않음)을 포함한다.The liquid crystal panel 1 includes a lower substrate 1a including a gate bus line, a data bus line, and a pixel electrode, an upper substrate 1b on which color filters and a counter electrode are formed, and the lower substrate 1a and an upper portion. It includes a liquid crystal (not shown) interposed between the substrate 1b.
이때, 상부기판(1b)의 크기는 하부기판(1a)의 크기 보다 작으며, 상부기판(1b)과 하부기판(1a)은 일측 모서리가 일치되도록 부착되어, 상기 하부기판(1a)의 두 측 모서리 부분이 노출된다. 이때, 노출된 하부기판(1a)의 두 측면 중 단측면에는 게이트패드들(도시되지 않음)이 배열되어 있고, 장측면에는 데이터패드들(도시되지 않음)이 배열된다. 게이트 PCB(2)는 게이트패드들이 배열된 액정패널(1)의 외측에 TCP(5)에 의하여 부착되고, 데이터 PCB(3)는 데이터패드들이 배열된 액정패널 (1)의 외측에 TCP(5)에 의하여 부착된다.At this time, the size of the upper substrate (1b) is smaller than the size of the lower substrate (1a), the upper substrate (1b) and the lower substrate (1a) is attached so that one side corners coincide, the two sides of the lower substrate (1a) The corner part is exposed. In this case, gate pads (not shown) are arranged on a short side of two side surfaces of the exposed lower substrate 1a, and data pads (not shown) are arranged on a long side. The gate PCB 2 is attached to the outer side of the liquid crystal panel 1 in which the gate pads are arranged by TCP 5, and the data PCB 3 is attached to the outer side of the liquid crystal panel 1 in which the data pads are arranged. ) Is attached.
그리고, 이러한 액정패널(1), PCB(2,3) 및 광원인 백라이트(도시되지 않음)는 프레임(도시되지 않음)에 의하여 고정된다. 이때, 프레임은 노트 북(note book)과 같은 시스템에 장착하는 과정에서 시스템 외부로부터 발생되는 노이즈가 액정패널에 전달되지 않도록 하는 역할을 한다.The liquid crystal panel 1, the PCBs 2 and 3, and the backlight (not shown) which are the light sources are fixed by a frame (not shown). In this case, the frame serves to prevent noise generated from the outside of the system from being transferred to the liquid crystal panel in the process of mounting on a system such as a note book.
여기서, 게이트 PCB(2)는 시스템과 함께 접지되고, 데이터 PCB(3)는 프레임과 함께 접지된다. 이에따라, 시스템과 프레임에 발생되는 노이즈 등이 접지단자를 통하여 방출된다.Here, the gate PCB 2 is grounded with the system and the data PCB 3 is grounded with the frame. Accordingly, noise generated in the system and the frame is emitted through the ground terminal.
그러나, 상기한 액정표시장치는 광원인 백라이트, 구동용 인버터가 실장된 TCP 및 PCB 등으로부터, 외부의 EMI(electro- magnetic interference) 및 노이즈 등이 발생된다.However, in the liquid crystal display, external electromagnetic interference (EMI), noise, and the like are generated from a backlight, a TCP, a PCB, and the like in which a driving inverter is mounted.
이때, 프레임, PCB(2,3) 및 시스템은 각각 접지되어 있으므로, 이러한 부품에서 발생되는 EMI나 노이즈가 쉽게 제거된다. 그러나, 액정패널(1), 특히, 상기 액정패널(1)의 상부기판(1b)은 전기적으로 플로팅(floating)되어 있어 때문에 상기와 같은 EMI나 노이즈가 기판에 잔류하게 된다.At this time, the frame, the PCB (2, 3) and the system is grounded, respectively, so that EMI or noise generated in these components can be easily removed. However, since the liquid crystal panel 1, in particular, the upper substrate 1b of the liquid crystal panel 1 is electrically floating, such EMI and noise remain on the substrate.
이로 인해, 액정표시장치의 화면이 흔들리거나, 얼룩이 발생되기 쉬우며, 그래서, 고품위의 화질을 얻는데 어려움이 있다. For this reason, the screen of the liquid crystal display device is easily shaken or unevenly generated, and therefore, it is difficult to obtain high quality image quality.
따라서, 본 발명은 상술한 종래의 문제점을 해결하기 위하여 안출된 것으로, 액정패널의 상부기판에 잔류하는 EMI 및 노이즈를 제거하여 고품위의 화질을 얻을 수 있는 액정표시장치를 제공하는 것을 극 목적으로 한다.Accordingly, an object of the present invention is to provide a liquid crystal display device capable of obtaining high quality image quality by removing EMI and noise remaining on the upper substrate of the liquid crystal panel. .
상기한 본 발명의 목적을 달성하기 위하여, 본 발명의 일 실시예에 따르면, 대향하는 하부기판과 상부기판; 상기 하부기판의 내측면에 매트릭스 형태로 배치된 화소전극; 상기 상부기판의 내측면에 배치된 컬러필터; 상기 컬러필터 표면에 배치되며, 하부기판의 접지단과 연결되는 제1상대전극; 상기 제1상대전극 표면에 배치된 절연막; 및 상기 절연막 표면에 배치되며, 공통신호가 인가되어 상기 화소전극과 함께 전계를 형성하는 제2상대전극;을 포함하는 것을 특징으로 하는 액정표시장치가 제공된다.In order to achieve the above object of the present invention, according to an embodiment of the present invention, the lower substrate and the upper substrate; A pixel electrode arranged in a matrix form on an inner surface of the lower substrate; A color filter disposed on an inner surface of the upper substrate; A first relative electrode disposed on a surface of the color filter and connected to the ground terminal of the lower substrate; An insulating film disposed on a surface of the first relative electrode; And a second relative electrode disposed on the surface of the insulating layer and having a common signal applied thereto to form an electric field together with the pixel electrode.
본 발명에 의하면, 상부기판의 상대전극을 접지시키므로써, 상부기판 측에 발생되는 EMI 및 노이즈를 효과적으로 제거할수 있다.According to the present invention, by grounding the counter electrode of the upper substrate, EMI and noise generated on the upper substrate side can be effectively removed.
(실시예)(Example)
이하, 첨부한 도면에 의거하여 본 발명의 바람직한 실시예를 자세히 설명하도록 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명의 일 실시예에 따른 액정패널의 단면도이고, 도 3은 본 발명의 다른 실시예에 따른 액정패널의 단면도이다.2 is a cross-sectional view of a liquid crystal panel according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view of a liquid crystal panel according to another exemplary embodiment of the present invention.
본 발명에서는 액정패널의 상부기판 측에 잔류하는 EMI 및 노이즈를 방지하기 위하여, 상부기판의 상대전극을 접지시킨다.In the present invention, in order to prevent EMI and noise remaining on the upper substrate side of the liquid crystal panel, the counter electrode of the upper substrate is grounded.
즉, 도 2에 도시된 바와 같이, 하부기판(10)의 내측면에는 매트릭스 형태로 화소전극(11)이 배열되어 있다. 이와 대향하는 상부기판(15)의 내측면에는 컬러필터(16) 및 상대전극(17)이 차례로 배치된다.That is, as shown in FIG. 2, the pixel electrodes 11 are arranged on the inner surface of the lower substrate 10 in a matrix form. The color filter 16 and the counter electrode 17 are sequentially disposed on the inner surface of the upper substrate 15 facing the same.
여기서, 상기 상대전극(17)은 플레이트 형상을 가지며, 접지용 전도성 트랜스퍼 패드(20)에 의하여 하부기판(10)의 접지단(도시되지 않음)과 콘택된다. 이때, 상기 하부기판(10)의 접지단은 PCB(도시되지 않음)의 접지부와 연결된다.Here, the counter electrode 17 has a plate shape and contacts the ground terminal (not shown) of the lower substrate 10 by the conductive transfer pad 20 for grounding. At this time, the ground terminal of the lower substrate 10 is connected to the ground of the PCB (not shown).
이와같이, 상부기관(15)에 배치되는 상대전극(17)이 하부기판(10)의 접지단과 콘택되면, 상부기판(15) 측에 잔류하던 EMI나 노이즈가 전도성 트랜스퍼 패드(20)을 통하여 하부기관(10)의 접지단과 연결된 PCB(도시되지 않음)의 접지부로 빠져나가게 된다.As such, when the counter electrode 17 disposed on the upper engine 15 contacts the ground terminal of the lower substrate 10, EMI or noise remaining on the upper substrate 15 side may be lowered through the conductive transfer pad 20. It is exited to the ground of the PCB (not shown) connected to the ground terminal of (10).
따라서, 본 발명의 액정표시장치는 상부기판(15) 측의 EMI나 노이즈가 쉽게 제거되는 바, 화면이 흔들리거나 얼룩이 발생되는 등의 화질 저하는 효과적으로 예방된다.Therefore, in the liquid crystal display of the present invention, EMI or noise on the upper substrate 15 side can be easily removed, and thus the image quality deterioration such as shaking or staining of the screen is effectively prevented.
또한, 액정표시장치의 특정 주파수대에서 발생되는 EMI는 상대전극(17)의 두께를 조절하므로써 제거할 수 있다.In addition, EMI generated in a specific frequency band of the liquid crystal display device can be removed by adjusting the thickness of the counter electrode 17.
한편, 본 실시예서는 상대전극(17)에 접지전압이 계속적으로 인가되는 것이므로, 액정 캐패시터를 형성하기 위하여, 즉, 화소전극(11)과 상대전극(17) 사이에 전계가 형성되도록 하기 위하여는 게이트버스라인 및 데이터버스라인(도시되지 않음)에 인가되는 신호를 조절하여야 한다.In the present embodiment, since the ground voltage is continuously applied to the counter electrode 17, in order to form a liquid crystal capacitor, that is, to form an electric field between the pixel electrode 11 and the counter electrode 17. Signals applied to gate bus lines and data bus lines (not shown) must be adjusted.
도 3은 본 발명의 다른 실시예를 설명하기 위한 것으로, 본 실시예는 상술한 일 실시예에서와 같이 게이트버스라인 및 데이터버스라인의 신호 조절없이 상부기판에 잔류하는 EMI 및 노이즈를 제거하는 방법이다.3 is a view for explaining another embodiment of the present invention, and this embodiment is a method for removing EMI and noise remaining on an upper substrate without signal control of a gate bus line and a data bus line as in the above-described embodiment. to be.
즉, 도 3에 도시된 바와 같이, 하부기판(10)의 내측면에는 매트릭스 형태로 화소전극(11)이 배열되어 있다. 이와 대향하는 상부기판(15)의 내측면에는 컬러필터(16) 및 제1상대전극(17)이 차례로 배치되고, 제1상대전극(17) 표면 상에는 절연막(18)과 제2상대전극(19)이 순차적으로 배치된다.That is, as shown in FIG. 3, the pixel electrodes 11 are arranged on the inner surface of the lower substrate 10 in a matrix form. On the inner side of the upper substrate 15 facing each other, the color filter 16 and the first relative electrode 17 are sequentially disposed, and the insulating film 18 and the second relative electrode 19 are disposed on the surface of the first relative electrode 17. ) Are arranged sequentially.
여기서, 상기 제1 및 제2상대전극(17,19)은 모두 플레이트 형상을 가진다. 또한, 상기 제1상대전극(17)은 접지용 전도성 트랜스퍼 패드(20)에 의하여 하부기판(10)의 접지단과 콘택되며, 상기 제2상대전극(19)은 공통신호단자(도시되지 않음)와 콘택된다. 이때, 하부기판(10)의 접지단은 PCB(도시되지 않음)의 접지부와 연결된다.Here, the first and second relative electrodes 17 and 19 both have a plate shape. In addition, the first relative electrode 17 is contacted with the ground terminal of the lower substrate 10 by a conductive transfer pad 20 for grounding, and the second relative electrode 19 is connected to a common signal terminal (not shown). Contact is made. At this time, the ground terminal of the lower substrate 10 is connected to the ground of the PCB (not shown).
이와같이, 제1상대전극(17)은 하부기판(10)의 접지단과 콘택되고, 제2상대전극(19)은 공통신호단자와 콘택되면, 상부기판(15) 측에 잔류하던 EMI나 노이즈는 트랜스퍼 패드(20)을 통해 PCB(도시되지 않음)의 접지부로 빠져나가게 되고, 그리고, 제2상대전극(19)은 화소전극(11)과 함께 전계를 형성하게 된다.As such, when the first relative electrode 17 contacts the ground terminal of the lower substrate 10 and the second relative electrode 19 contacts the common signal terminal, EMI or noise remaining on the upper substrate 15 side is transferred. The pad 20 exits to the ground of the PCB (not shown), and the second relative electrode 19 forms an electric field together with the pixel electrode 11.
따라서, 본 실시예 또한 상부기판(15) 측에 발생되는 EMI 및 노이즈를 효과적으로 제거할 수 있으며, 그리고, 이전 실시예와 비교해서 게이트버스라인 및 데이터버스라인의 신호를 별도로 조절하지 않아도 되므로, 액정 구동을 용이하게 할 수 있다.Therefore, the present embodiment can also effectively remove the EMI and noise generated on the upper substrate 15 side, and compared to the previous embodiment, the signals of the gate bus line and the data bus line do not need to be adjusted separately, so that the liquid crystal Driving can be facilitated.
이상에서 자세히 설명된 바와 같이, 본 발명에 의하면, 상부기판의 상대전극을 접지시키므로써, 상부기판 측에 발생되는 EMI 및 노이즈를 효과적으로 제거할수 있다. 따라서, 본 발명은 EMI 및 노이즈에 의해 화면이 흔들리거나 얼룩이 발생되는 등의 화질 저하 요인을 효과적으로 제거할 수 있다.As described in detail above, according to the present invention, by grounding the counter electrode of the upper substrate, EMI and noise generated on the upper substrate side can be effectively removed. Therefore, the present invention can effectively eliminate the deterioration factors such as the screen shake or spots caused by EMI and noise.
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.
도 1은 종래의 액정표시장치를 나타낸 블록도.1 is a block diagram showing a conventional liquid crystal display device.
도 2는 본 발명의 일 실시예에 따른 액정패널의 단면도.2 is a cross-sectional view of a liquid crystal panel according to an embodiment of the present invention.
도 3은 본 발명의 다른 실시예에 따른 액정패널의 단면도.3 is a cross-sectional view of a liquid crystal panel according to another embodiment of the present invention.
(도면의 주요 부분에 대한 부호의 설명)(Explanation of symbols for the main parts of the drawing)
10 : 하부기판 11 : 화소전극10: lower substrate 11: pixel electrode
15 : 상부기판 16 : 컬러필터15: upper substrate 16: color filter
17,19 : 상대전극 20 : 트랜스퍼 패드17,19: counter electrode 20: transfer pad
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980024229A KR100520377B1 (en) | 1998-06-25 | 1998-06-25 | Liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019980024229A KR100520377B1 (en) | 1998-06-25 | 1998-06-25 | Liquid crystal display |
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| Publication Number | Publication Date |
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| KR20000003117A KR20000003117A (en) | 2000-01-15 |
| KR100520377B1 true KR100520377B1 (en) | 2006-01-12 |
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