KR100252070B1 - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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KR100252070B1
KR100252070B1 KR1019970055559A KR19970055559A KR100252070B1 KR 100252070 B1 KR100252070 B1 KR 100252070B1 KR 1019970055559 A KR1019970055559 A KR 1019970055559A KR 19970055559 A KR19970055559 A KR 19970055559A KR 100252070 B1 KR100252070 B1 KR 100252070B1
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South Korea
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liquid crystal
crystal display
substrate
electrode layer
layer
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KR1019970055559A
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Korean (ko)
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KR19990034078A (en
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박의열
처내오 야마자끼
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손욱
삼성에스디아이주식회사
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Priority to KR1019970055559A priority Critical patent/KR100252070B1/en
Priority to JP10301905A priority patent/JPH11218776A/en
Priority to CN98123620A priority patent/CN1217521A/en
Publication of KR19990034078A publication Critical patent/KR19990034078A/en
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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
    • 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
    • G02F1/133305—Flexible substrates, e.g. plastics, organic film
    • 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
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • 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
    • G02F1/1343—Electrodes

Abstract

PURPOSE: A liquid crystal display is provided to lower an electric resistance and improve a conductivity by forming a rear substrate of an LCD with a material like PCB. CONSTITUTION: An LCD(20) comprises a front polarized light board(11a) located in the most external angle, a front substrate(17a) formed under the front polarized light board(11a), the first electrode layer(14a) formed on the front substrate(17a) with a specific pattern, a liquid crystal layer(13a) formed under the first electrode layer(14a), upper and lower alignment films(19a,19b) formed in an external side of the liquid crystal layer(13a) to align particles of the liquid crystal layer(13a) to a specific direction, a spacer(13b) intervened between the upper and lower alignment films(19a,19b), the second electrode layer(24c) formed under the lower alignment film(19b), and a rear substrate(28) having the second electrode layer(24c).

Description

액정 표시 장치Liquid crystal display

본 발명은 액정표시소자에 관한 것으로서, 특히 ITO가 형성된 배면기판을 경제적인 기판 재료로 대체하여 제작되는 액정 표시 장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device manufactured by replacing an ITO-formed back substrate with an economical substrate material.

액정 표시 장치는 외부로부터 광이 입사된 후, 반사 되어서 보여지는 수광형장치이다. 상기와 같은 액정 표시 장치는 경박형, 저소비전력으로 집적회로와의 설계가 용이하여 전자기기, 노트북 컴퓨터, 벽걸이 텔레비전 등의 정보를 나타내는 영상 또는 문자의 표시장치로서 사용된다.The liquid crystal display is a light-receiving type device that is reflected by light after being incident from the outside. The liquid crystal display device as described above is light and thin, has low power consumption, and is easy to design with an integrated circuit, and thus is used as an image or text display device for displaying information on electronic devices, notebook computers, wall-mounted televisions, and the like.

도 1은 종래의 액정 표시 장치의 구성을 도시한 개략적인 단면도이다.1 is a schematic cross-sectional view showing the configuration of a conventional liquid crystal display device.

도면을 참조하면, 종래의 액정 표시 장치(10)는 소정간격 이격되어, 상호 나란하게 배치되며 유리재질로 된 전면기판(17a) 및 배면기판(17b), 상기 전면기판(17a)과 배면기판(17b)의 외부에 설치되는 전면편광판(11a)과 배면편광판(11b), 또한 상기 전면기판(17a)과 배면기판(17b)의 내부에 설치되는 매트릭스상의 제1전극층(14a)과 제2전극층(14b)을 포함한다.Referring to the drawings, the conventional liquid crystal display device 10 is spaced apart from each other by a predetermined interval, arranged in parallel with each other and made of a glass substrate front substrate 17a and back substrate 17b, the front substrate 17a and the rear substrate ( The first polarizing plate 11a and the rear polarizing plate 11b, which are provided outside the 17b), and the first electrode layer 14a and the second electrode layer 14, which are formed inside the front substrate 17a and the rear substrate 17b. 14b).

또한 상기 전면기판(17a)과 배면기판(17b) 사이에는 실링재(13c)에 의해 액정층(13a)이 충진되는 독립공간이 형성된다.In addition, an independent space in which the liquid crystal layer 13a is filled by the sealing material 13c is formed between the front substrate 17a and the rear substrate 17b.

또한 상기 액정층(13a)이 충진된 상기 독립공간에는 상기 액정층(13a)을 소정의 방향으로 배향시키기 위한 두 개의 배향막(19a)(19b)이 상하로 나란하게 형성되며, 상기 상하 배향막(19a)(19b)들 사이에 스페이서(13b)가 개재되어 상기 전면기판(17a)과 배면기판(17b)을 소정의 간격으로 유지시켜 준다.In addition, in the independent space filled with the liquid crystal layer 13a, two alignment layers 19a and 19b for aligning the liquid crystal layer 13a in a predetermined direction are formed side by side, and the vertical alignment layer 19a is formed. The spacers 13b are interposed between the pads 19b to maintain the front substrate 17a and the rear substrate 17b at predetermined intervals.

그리고 상기 배면기판(17b) 하부의 배면편광판(11b)의 외표면에는 반사판(16)이 설치된다.In addition, a reflecting plate 16 is provided on an outer surface of the rear polarizing plate 11b under the rear substrate 17b.

상기의 액정 표시 장치를 만들기 위해서는 먼저 유리로 된 배면기판(17b) 상에 전극부분을 형성하기 위하여 스퍼터링(sputtering) 방식으로 인디움 틴 옥사이드 막(indium tin oxide coating/이하 "ITO"라고 함)을 입힌다. 이후 상기 ITO막에 포토 레지스터를 도포하여 노광에 의해 소정의 패턴으로 상술한 제2전극층(14b)을 형성시키는데, 종래의 액정 표시 장치(10)에서는 ITO용 솔더를 사용함으로써 발생되는 높은 저항(여기서 코팅된 ITO막의 표면저항은 10옴 내지 15옴 정도)으로 인하여 배면기판(17b) 위에 직접 부품을 실장하기가 곤란하고, 또한 상기 ITO막을 형성하기 위해서는 스퍼터링공정을 거쳐야 하므로 제작단가가 높아지는 문제점이 있다.In order to form the liquid crystal display device, an indium tin oxide coating (hereinafter referred to as "ITO") is first formed by sputtering to form an electrode portion on a glass back substrate 17b. Clothe. Thereafter, a photoresist is applied to the ITO film to form the second electrode layer 14b described above in a predetermined pattern by exposure. In the conventional liquid crystal display device 10, a high resistance generated by using ITO solder (here Since the surface resistance of the coated ITO film is about 10 to 15 ohms), it is difficult to mount the component directly on the back substrate 17b, and in order to form the ITO film, a sputtering process is required to increase the manufacturing cost. .

또한 최근의 액정 표시 장치 모듈은 대부분이 LSI같은 구동 칩(18a)을 실장하고 있는데, TAB(Tape Automated Bonding) 방식으로 상기 배면기판(17b)상에 상기 구동 칩(18a)을 실장코자 할 경우 전사 범퍼(Bumper) 실장방식 등을 사용하며, 이는 상기 구동 칩(18a) 상에 금속다층막을 형성하는 포토 리소그라피(Photo-lithography) 등의 복잡한 공정으로, 대단히 어렵고 제조 코스트가 고액인 단점이 있었다.In addition, most of the recent liquid crystal display modules have a driving chip 18a such as LSI, which is transferred when the driving chip 18a is mounted on the back substrate 17b by a tape automated bonding (TAB) method. A bumper mounting method is used, which is a complicated process such as photolithography in which a metal multilayer is formed on the driving chip 18a, and has a disadvantage of being extremely difficult and expensive to manufacture.

또한 상기 배면기판(17b)의 하부에 배면편광판(11b)과 반사판(16)을 사용할 경우 재료비의 상승, 공정수의 증가, 경박화 곤란 등의 단점이 있다.In addition, when the rear polarizing plate 11b and the reflecting plate 16 are used under the rear substrate 17b, there are disadvantages such as an increase in material cost, an increase in the number of processes, and difficulty in thinning.

본 발명은 상기 문제점을 해결하기 위하여 창출된 것으로 액정 표시 장치의 배면기판을 PCB 등의 재질로 대체 형성하여 경제적인 액정 표시 장치를 제공함에 그 목적이 있다.The present invention has been made to solve the above problems, and an object thereof is to provide an economical liquid crystal display device by replacing the back substrate of the liquid crystal display device with a material such as a PCB.

도 1은 종래의 액정 표시 장치의 구조를 개략적으로 도시한 단면도이다.1 is a cross-sectional view schematically illustrating a structure of a conventional liquid crystal display.

도 2는 본 발명에 따른 액정 표시 장치의 구조를 개략적으로 도시한 단면도이다.2 is a cross-sectional view schematically showing the structure of a liquid crystal display according to the present invention.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

11a...전면편광판 11b...배면편광판11a ... front polarizer 11b ... back polarizer

13a...액정층 13b...스페이서13a ... liquid layer 13b ... spacer

14a...제1전극층 14b,24c...제2전극층14a ... first electrode layer 14b, 24c ... second electrode layer

16...반사판 17a...전면기판16 ... Reflector 17a ... Front board

17b,28...배면기판17b, 28 ... back board

상기와 같은 목적을 달성하기 위해서 본 발명의 액정 표시 장치는 전면기판과, 상기 전면기판에 대향하는 배면기판과, 상기 기판들의 내측면에 소정 패턴으로 형성된 제1, 2전극층과, 상기 제1, 2전극층들 사이에 형성된 액정층을 구비한 액정 표시 장치에 있어서, 상기 배면기판은 합성 수지 재료 또는 글래스 파이버 재료로 형성되는 것을 특징으로 한다.In order to achieve the above object, the liquid crystal display of the present invention includes a front substrate, a rear substrate facing the front substrate, first and second electrode layers formed in predetermined patterns on inner surfaces of the substrates, and the first and second substrates. A liquid crystal display device having a liquid crystal layer formed between two electrode layers, wherein the back substrate is formed of a synthetic resin material or a glass fiber material.

또한 상기 배면기판의 내측면에는 동박의 제2전극층이 형성되는 것을 더 포함하는 것이 바람직하다. 또한 상기 합성 수지 재료는 에폭시, 폴리카보네이트, 폴리에테르 살폰, 폴리알리레드 들 중 어느 하나인 것을 더 포함하는 것이 바람직하다.In addition, it is preferable that the inner surface of the rear substrate further includes a second electrode layer of copper foil is formed. In addition, the synthetic resin material preferably further comprises any one of epoxy, polycarbonate, polyether salone, polyalired.

이하 첨부된 도면을 참조로 본 발명에 따른 액정 표시 장치의 바람직한 일 실시예를 상세히 설명하기로 한다.Hereinafter, an exemplary embodiment of a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 액정 표시 장치의 구조를 개략적으로 도시한 단면도이다. 여기에서 앞서 도시된 도면에서와 동일한 참조부호는 동일한 구성요소를 가리킨다.2 is a cross-sectional view schematically showing the structure of a liquid crystal display according to the present invention. Here, the same reference numerals as in the above-described drawings indicate the same components.

상기 도면을 참조하면, 본 발명에 따른 액정 표시 장치(20)는 최외각에 위치하는 전면편광판(11a)과 상기 전면편광판(11a)의 하부에 형성되며 투명한 재질로 이루어진 전면기판(17a)과, 상기 전면기판(17a)에 소정의 패턴으로 형성된 제1전극층(14a)과, 상기 제1전극층(14a)의 하단에 형성된 액정층(13a)과, 상기 액정층(13a)의 분자를 소정의 방향으로 배향시키기 위해 소정간격으로 상기 액정층(13a) 외부에 형성된 상하 배향막(19a)(19b)과, 상기 상하 배향막(19a)(19b) 사이에 개재된 스페이서(13b), 상기 하부 배향막(19b) 하부에 형성된 제2전극층(24c) 및 상기 제2전극층(24c)이 형성된 배면기판(28)을 포함한다.Referring to the drawings, the liquid crystal display device 20 according to the present invention includes a front polarizing plate 11a positioned at the outermost portion and a front substrate 17a formed under the front polarizing plate 11a and made of a transparent material; A first electrode layer 14a formed in a predetermined pattern on the front substrate 17a, a liquid crystal layer 13a formed at a lower end of the first electrode layer 14a, and molecules of the liquid crystal layer 13a in a predetermined direction. Spacer 13b and the lower alignment layer 19b interposed between the upper and lower alignment layers 19a and 19b formed outside the liquid crystal layer 13a at predetermined intervals, and the upper and lower alignment layers 19a and 19b. The lower electrode includes a second electrode layer 24c and a rear substrate 28 on which the second electrode layer 24c is formed.

또한 상기 배면기판(28)은 본 발명의 특징부로서 종래의 ITO 박막이 형성된 유리재질의 배면기판(도 1의 17b참조)을 대체한 것이며, 그 재료는 에폭시, 폴리카보네이트, 폴리에테르 살폰, 폴리알리레드 등의 유기 합성 수지 재료 또는 글래스 파이버인 것이 바람직하다. 또한 상기 배면기판(28)상에 형성되는 상기 제2전극층(24c)은 전도성과 광반사성이 있는 동박 등과 같은 물질로 형성되는 것이 바람직하다. 상기 배면기판(28)은 그 표면의 평면도(Flatness)가 상기 광반사성에 적합하도록 가공된다. 또한 도면에 도시되지는 않았지만 제1전극층(14a)과 제2전극층(24c) 사이에는 컬러필터가 개재되는 것을 더 포함하는 것이 바람직하다.In addition, the back substrate 28 is a feature of the present invention as a substitute for a glass back substrate (see 17b of FIG. 1) formed with a conventional ITO thin film, the material is epoxy, polycarbonate, polyether salpon, poly It is preferable that it is organic synthetic resin materials, such as alired, or glass fiber. In addition, the second electrode layer 24c formed on the rear substrate 28 is preferably formed of a material such as copper foil having conductivity and light reflectivity. The back substrate 28 is processed such that its flatness is suitable for the light reflectivity. Although not shown in the drawings, it is preferable to further include a color filter interposed between the first electrode layer 14a and the second electrode layer 24c.

상기 배면기판(28)상에 형성되는 상기 제2전극층(24c)은 전기저항이 낮아, 액정 표시부의 구동을 위해 설치되는 컴포넌트 즉, LSI 등의 구동 칩(18a)의 작동에 용이하다.The second electrode layer 24c formed on the back substrate 28 has a low electrical resistance, which facilitates operation of a component installed for driving the liquid crystal display, that is, a driving chip 18a such as an LSI.

특히, 종래의 COG(Chip On Glass)의 경우 상기 구동 칩(18a)을 유리 재질의 기판에 형성한 ITO에 실장 하였으나, 본 발명에 따른 배면기판(28)은 기존의 인쇄회로기판의 특성과 유사하므로 드라이브 LSI와 같은 구동 칩(18a)을 상기 배면기판(28)상에 형성되는 상기 제2전극층(24c)에 용이하게 실장할 수 있고, 또 다른 컴포넌트를 실장하는 것이 용이하다.In particular, in the case of a conventional chip on glass (COG), the driving chip 18a is mounted on an ITO formed on a glass substrate, but the back substrate 28 according to the present invention is similar to the characteristics of a conventional printed circuit board. Therefore, a driving chip 18a such as a drive LSI can be easily mounted on the second electrode layer 24c formed on the back substrate 28, and another component can be easily mounted.

상기한 본 발명에 따른 액정 표시 장치는 다음과 같은 효과가 있다.The liquid crystal display according to the present invention described above has the following effects.

첫째, 에폭시 등으로 된 배면기판 상에 동박 등으로 회로를 구성함으로써 전기저항이 낮고, 도전성이 양호하여 구동을 위한 부품을 용이하게 실장 할 수 있다.First, by constructing a circuit with a copper foil or the like on a back substrate made of epoxy or the like, the electrical resistance is low and the conductivity is good, so that components for driving can be easily mounted.

둘째, 보다 더 경박한 액정 표시 장치를 제작 할 수 있다.Second, a thinner liquid crystal display device can be manufactured.

셋째, 배면기판에 전극 재료를 코팅하는 스퍼터링 공정이 필요 없게 되어 제조경비가 절감된다.Third, the sputtering process of coating the electrode material on the back substrate is eliminated, thereby reducing manufacturing costs.

넷째, 조립이 간편하여 공정이 절감되며 부품수가 줄어 부품비가 절감된다.Fourth, the assembly is simple, the process is reduced, and the number of parts is reduced, thereby reducing the cost of parts.

본 발명은 도면에 도시된 일 실시 예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 본 기술 분야의 통상적 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시 예가 가능하다는 점을 이해할 것이다. 따라서 본 발명의 진정한 기술적 보호 범위는 첨부된 특허 청구 범위의 기술적 사상에 의해 정해져야만 할 것이다.Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (4)

전면기판과,Front board, 상기 전면기판에 대향하는 배면기판과,A rear substrate facing the front substrate, 상기 기판들의 내측면에 각각 소정 패턴으로 형성된 제1, 2전극층과,First and second electrode layers formed in predetermined patterns on inner surfaces of the substrates; 상기 제1, 2전극층들 사이에 형성된 액정층을 구비한 액정 표시 장치에 있어서,In the liquid crystal display device having a liquid crystal layer formed between the first and second electrode layers, 상기 배면기판은 합성 수지 재료 또는 글래스 파이버 재료로 형성되는 것을 특징으로 하는 액정 표시 장치.And the back substrate is formed of a synthetic resin material or a glass fiber material. 제1항에 있어서,The method of claim 1, 상기 배면기판의 내측면에는 동박의 제2전극층이 형성되는 것을 특징으로 하는 액정 표시 장치.The second electrode layer of copper foil is formed on the inner surface of the back substrate. 제2항에 있어서,The method of claim 2, 상기 동박의 제2전극층은 반사층을 겸하는 것을 더 구비되는 것을 특징으로 하는 액정 표시 장치.And the second electrode layer of the copper foil serves as a reflective layer. 제1항에 있어서,The method of claim 1, 상기 합성 수지 재료는 에폭시, 폴리카보네이트, 폴리에테르 살폰, 폴리알리레드 들 중 어느 하나인 것을 특징으로 하는 액정 표시 장치.The synthetic resin material is any one of epoxy, polycarbonate, polyether salone, polyallyled.
KR1019970055559A 1997-10-28 1997-10-28 Liquid crystal display KR100252070B1 (en)

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KR1019970055559A KR100252070B1 (en) 1997-10-28 1997-10-28 Liquid crystal display
JP10301905A JPH11218776A (en) 1997-10-28 1998-10-23 Liquid crystal display element
CN98123620A CN1217521A (en) 1997-10-28 1998-10-28 Liquidcrystal display

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