KR100294490B1 - Liquid crystal display - Google Patents
Liquid crystal display Download PDFInfo
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- KR100294490B1 KR100294490B1 KR1019980018333A KR19980018333A KR100294490B1 KR 100294490 B1 KR100294490 B1 KR 100294490B1 KR 1019980018333 A KR1019980018333 A KR 1019980018333A KR 19980018333 A KR19980018333 A KR 19980018333A KR 100294490 B1 KR100294490 B1 KR 100294490B1
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- liquid crystal
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- pentylphenylbiphenylcarboxylate
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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
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/54—Additives having no specific mesophase characterised by their chemical composition
- C09K19/542—Macromolecular compounds
- C09K19/544—Macromolecular compounds as dispersing or encapsulating medium around the liquid crystal
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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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
Abstract
Description
본 발명은 온도 전이형 액정에 상호 보상 작용을 하는 카이랄 도판트를 첨가하여 액정의 초기에 설정된 피치(360도로 꼬이는 길이)값의 변형을 방지할 수 있도록 하고, 결과적으로 균일한 콘트라스트를 실현할 수 있도록 한 카이랄 네마틱(chiral nematic) 상의 액정표시소자에 관한 것이다.According to the present invention, a chiral dopant having a mutually compensating effect can be added to a temperature-transfer type liquid crystal to prevent deformation of an initial set pitch (360 degree twisted length) value of the liquid crystal, thereby realizing uniform contrast. The present invention relates to a liquid crystal display device on a chiral nematic.
액정표시소자는 시각정보에 대한 다양화와 미래형 디스플레이로서의 역할을 견지하기 위해 대용량화, 고화질화, 저소비전력화가 추구되고 있다.In order to keep diversification of visual information and its role as a future display, liquid crystal display devices have been pursued to have higher capacity, higher quality, and lower power consumption.
이러한 노력의 일환으로 TFT(thin film transistor) 액정표시소자와 달리 제조가 간단하고, STN(super twisted nematic) 액정표시소자의 기술을 그대로 이용하면서도 저전력 동작과 동화상 구현이 가능하며 콘트라스트 비가 높고 쌍안정 특성을 갖는 BTN(bistable twisted nematic) 액정표시소자가 US PAT. 5,594,464호 및 US PAT. 4,239,345호, 그리고 한국광학회지 제 8권 제 3호(1997월 6월)에 소개되어 있다.As part of this effort, it is simple to manufacture unlike TFT (thin film transistor) liquid crystal display device, and it is possible to realize low power operation and moving image while using the technology of STN (super twisted nematic) liquid crystal display device with high contrast ratio and bistable characteristics. BTN (bistable twisted nematic) liquid crystal display device having a US PAT. 5,594,464 and US PAT. 4,239,345, and Korean Optical Journal Vol. 8, No. 3 (June 1997).
여기에 소개된 BTN 액정표시소자는 네마틱 액정에 카이랄 도판트(chiral dopant)를 첨가하여 원하는 꼬임각을 갖도록 한 것이며, 2종류의 준안정 상태로전이되는 쌍안정 특성을 갖추어 그레이레벨의 표현이 가능하고, 꼬임각이 커서 시야각이 광대역함은 물론 콘트라스트비가 높고, 저전력에 의한 구동이 가능하며, 스위칭속도가 빨라 동화상이 구현되도록 하고 있다.The BTN liquid crystal display device introduced here has a chiral dopant added to the nematic liquid crystal to have a desired twist angle, and it has a bistable characteristic that transitions to two kinds of metastable states to express gray levels. In addition, the twist angle is large, and the viewing angle is wide, the contrast ratio is high, the driving is possible by low power, and the switching speed is fast to realize the moving image.
이를 위하여 BTN 액정표시소자는 유리 기판위에 투명전극, 절연막, 배향막을 차례로 형성하고, 꼬임각이 ψ로 된 셀을 얻기 위해 상, 하의 배향막을 서로 반대 방향으로 러빙한 것이며, 스페이서를 이용해 셀의 두께를 일정하게 유지하고, 액정의 꼬임각이 ψ가 되도록 카이랄 도판트가 첨가된 네막틱 액정을 주입한 구성으로 이루어진다.BTN liquid crystal display is a transparent electrode, an insulating film, and an alignment film formed on a glass substrate in this order, and the upper and lower alignment films are rubbed in opposite directions to obtain a cell having a twist angle of ψ, and the thickness of the cells using spacers Is maintained constant, and the nematic liquid crystal to which the chiral dopant is added is injected such that the twist angle of the liquid crystal is ψ.
이렇게 구성된 BTN 액정표시소자는 구동 전압을 인가할 때 ψ-π 또는 ψ+π로 전이되는 액정의 쌍안정 특성에 의해 화상을 구현하게 되는 바, 액정의 쌍안정 특성은 셀의 두께(d)와 액정의 피치(p)와의 비 즉, d/p값에 의해 그 안정성이 정하여 질 수 있다.The BTN liquid crystal display device configured as described above implements an image by the bistable characteristics of the liquid crystal transitioned to ψ-π or ψ + π when the driving voltage is applied. The stability thereof can be determined by the ratio of the liquid crystal to the pitch p, that is, the d / p value.
이러한 특성에 비추어 볼 때, BTN 액정표시소자는 쌍안정 특성을 고려하여 제조된 초기의 d/p값을 그대로 유지할 필요성이 있으며, d/p값이 변화될 경우 오동작을 일으키게 되는 것이다. 여기서 셀의 두께(d)는 일정한 것이므로 결국 액정의 피치(p)에 의해 BTN 액정표시소자의 표시 특성이 정하여 질 수 있다.In view of these characteristics, the BTN liquid crystal display device needs to maintain the initial d / p value produced in consideration of bistable characteristics, and causes a malfunction when the d / p value is changed. Since the thickness d of the cell is constant, the display characteristics of the BTN liquid crystal display may be determined by the pitch p of the liquid crystal.
그러나 지금까지 알려진 액정은 온도 전이형 물질로서 온도 변화에 따라 그 상이 변화되는 것이며, 특히 네마틱 액정에 카이랄 도판트가 첨가된 경우 액정의 피치는 카이랄 도판트에 의해 변화되고 그 변화량은 액정에 의해 정하여지게 되므로, 온도가 변화될 경우 초기 제작 당시의 액정 피치(p)가 변화되고, 결과적으로액정표시소자의 콘트라스트 및 표시 특성을 저하시키는 문제점을 수반하게 된다.However, the liquid crystal known to date is a temperature-transforming material, the phase of which changes with temperature, and especially when the chiral dopant is added to the nematic liquid crystal, the pitch of the liquid crystal is changed by the chiral dopant, and the amount of change is the liquid crystal. Since the liquid crystal pitch p at the time of initial fabrication is changed when the temperature is changed, it is accompanied with a problem of lowering the contrast and display characteristics of the liquid crystal display element.
앞서 설명된 종래 기술의 문제점을 해소하기 위한 목적에서 안출된 것으로, 본 발명은 온도 변화에 수반되는 피치 즉, d/p의 초기 설정값 변화를 방지하고, 온도에 따른 콘트라스트 및 표시 특성 저하를 개선할 수 있도록 한 액정표시소자를 제공함에 그 목적을 두고 있다.SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the problems of the prior art described above, and the present invention prevents the initial setting value change of the pitch, i.e., d / p, accompanying the temperature change, and improves the contrast and display characteristics deterioration with temperature. It is an object of the present invention to provide a liquid crystal display device.
상기 목적을 실현하기 위하여 본 발명은 온도의 증감에 대하여 상호 보상하는 쪽으로 액정의 꼬임각을 변화시키는 2종류 이상의 카이랄 도판트를 네마틱 상의 액정에 첨가하여 카이랄 네마틱 상의 액정을 형성하고, 이것을 투명 전극, 절연막 및 배향막이 차례로 형성된 상, 하 유리 기판의 사이에 주입, 봉합함으로써 얻어진 액정표시소자를 제안한다.In order to realize the above object, the present invention adds two or more kinds of chiral dopants for changing the twist angle of the liquid crystal toward mutual compensation for increase and decrease of temperature to the liquid crystal of the nematic phase to form a liquid crystal of the chiral nematic phase, The liquid crystal display element obtained by injecting and sealing this between the upper and lower glass substrate in which the transparent electrode, the insulating film, and the oriented film were formed one by one is proposed.
여기서 본 발명의 목적물인 카이랄 네마틱 상의 액정은 피치를 변화시키는 카이랄 도판트의 상호 보상 작용에 의해, 액정의 꼬임각의 변화를 방지할 수 있으며, 그에 따라 콘트라스트 및 표시 특성의 저하를 방지할 수 있는 것이다.Here, the liquid crystal of the chiral nematic phase, which is the object of the present invention, can prevent the change of the twist angle of the liquid crystal by mutual compensation action of the chiral dopant which changes the pitch, thereby preventing the deterioration of contrast and display characteristics. You can do it.
이하, 본 발명을 실현하기 위한 바람직한 실시예를 보다 상세하게 설명한다.Hereinafter, preferred embodiments for realizing the present invention will be described in more detail.
본 발명은 유리 기판위에 투명전극, 절연막, 배향막을 차례로 형성하고, 꼬임각이 ψ로 된 셀을 얻기 위해 상, 하의 배향막을 서로 반대 방향으로 러빙한 것이며, 스페이서를 이용해 셀의 두께를 일정하게 유지하고, 액정의 꼬임각이 ψ가 되도록 하기 위해 네마틱 액정에 2종의 카이랄 도판트를 첨가하여 얻어진 카이랄네마틱 액정을 주입한 구성으로 이루어진다.According to the present invention, a transparent electrode, an insulating film, and an alignment film are sequentially formed on a glass substrate, and the upper and lower alignment films are rubbed in opposite directions to obtain a cell having a twist angle of ψ, and the thickness of the cells is kept constant using spacers. The chiral nematic liquid crystal obtained by adding two kinds of chiral dopants to the nematic liquid crystal is injected so that the twist angle of the liquid crystal becomes ψ.
여기서 본 발명의 목적물인 카이랄 네마틱 액정은 온도 증감에 따라 액정의 초기 설정된 꼬임각이 변화되는 문제점을 방지할 수 있도록 한 것이며, 이를 위하여 액정의 꼬임각을 상호 보상하는 쪽으로 조정하는 2종류의 카이랄 도판트를 첨가한 구성으로 되어 있다.The chiral nematic liquid crystal, which is the object of the present invention, is intended to prevent the problem of changing the initial twist angle of the liquid crystal according to temperature increase and decrease, and for this purpose, two kinds of adjustments are made to compensate for the twist angle of the liquid crystal. It is the structure which added the chiral dopant.
보다 구체적으로, 본 발명에서는 네마틱 액정으로 독일의 머크사에서 출시된 제품중 ZLI-3054-000(페닐싸이클로헥산, 싸이클로헥실싸이클로헥산, 싸이클로헥실바이싸이클로헥실 카르복실레이트 및 싸이클로헥실비페닐싸이클로헥산의 혼합물)을 사용하고, 제 1 카이랄 도판트로 동사(同社)에서 출시된 제품중 S-811(옥틸헥실옥시벤조일옥시벤조에이트)을 사용하며, 제 2 카이랄 도판트로 동사에서 출시된 제품중 S-1011(펜틸페닐비페닐카르복실레이트)을 사용하고 있다. 또 제 1 카이랄 도판트로는 동사에서 출시된 제품중 R-811(S-811의 거울상체 도판트)을 사용하고, 제 2 카이랄 도판트로는 동사에서 출시된 제품중 R-1011(S-1011의 거울상체 도판트)을 사용할 수 있다.More specifically, in the present invention, ZLI-3054-000 (phenylcyclohexane, cyclohexylcyclohexane, cyclohexylbicyclohexyl carboxylate and cyclohexylbiphenylcyclohexane of the product released by Merck, Germany as a nematic liquid crystal) Of the product released by the company as the first chiral dopant and S-811 (octylhexyloxybenzoyloxybenzoate) as the second chiral dopant. S-1011 (pentylphenylbiphenylcarboxylate) is used. The first chiral dopant is R-811 (S-811 enantiomeric dopant), and the second chiral dopant is R-1011 (S-). 1011 enantiomeric dopant) may be used.
이와 같이 네마틱 액정에 첨가되는 제 1 및 제 2 카이랄 도판트는 온도의 변화에 대하여 각각 네마틱 액정과의 상호 작용에 의해 그 꼬임각을 변화시키게 되는 바, 그 작용을 온도의 변화에 대한 액정의 꼬이는 힘을 나타내는 HTP(헬리컬 트위스트 파워)값으로 표시하면 다음과 같다.As described above, the first and second chiral dopants added to the nematic liquid crystals change their twist angles by interaction with the nematic liquid crystals, respectively. The helical twisted power (HTP) value of the twisting force of is expressed as follows.
표 1에서 HTP의 '-'값은 왼쪽으로 꼬이는 방향을 나타낸 것이다. 표 1에 보여진 바와 같이 제 1 카이랄 도판트로 사용된 S-811과 제 2 카이랄 도판트로 사용된 S-1011은 꼬임 방향이 같고, HTP의 크기가 서로 반대로 증감됨을 알 수 있다.In Table 1, the '-' value of HTP indicates the direction of twisting to the left. As shown in Table 1, it can be seen that S-811 used as the first chiral dopant and S-1011 used as the second chiral dopant have the same twist direction, and the size of HTP increases and decreases in opposite directions.
따라서 본 발명의 목적물인 카이랄 네마틱 액정은 외부 및 내부 온도의 증가시 S-811의 작용에 의해 꼬이는 힘이 작아져 피치가 커지게 되지만, S-1011의 반대 작용에 의해 꼬이는 힘이 커져 피치가 다시 작아지게 되므로, 결과적으로 온도의 변화에 관계없이 초기에 설정된 피치(p)를 그대로 유지하게 되는 것이며, 액정 셀의 두께(d)가 일정하다고 볼 때 d/p값이 안정되므로 결국 구동 전압에 의한 쌍안정 특성이 향상되고, 제품의 콘트라스트 및 표시 특성이 향상되는 결과를 얻게 되는 것이다.Therefore, the chiral nematic liquid crystal, which is the object of the present invention, increases the pitch by decreasing the twisting force due to the action of S-811 when the external and internal temperatures increase, but increases the twisting force due to the opposite action of S-1011. Is smaller again, and as a result, the initial set pitch (p) is maintained as it is regardless of the change in temperature, and the d / p value is stabilized when the thickness (d) of the liquid crystal cell is constant. The bistable characteristic is improved, and the contrast and display characteristics of the product are improved.
이 경우에 본 발명을 구성하는 제 1 카이랄 도판트는 R-811이 사용될 수 있는데 이것은 S-811과 동일 제품이나 액정의 꼬이는 방향이 반대인 것이고, 제 2 카이랄 도판트는 마찬가지로 R-1011이 사용될 수 있다.In this case, R-811 may be used as the first chiral dopant constituting the present invention, which is the same as that of S-811 but the twisting direction of the liquid crystal is reversed, and R-1011 may be used as the second chiral dopant. Can be.
한편, 본 발명의 카이랄 네막틱 액정에 첨가되는 제 1 및 제 2 카이랄 도판트의 첨가량은 액정의 꼬이는 힘을 나타내는 HTP값의 변화량에 반비례하는 비율로 정하여지는 바, 이것은 다음과 같이 설명될 수 있다.On the other hand, the amount of the first and second chiral dopants added to the chiral nemaktic liquid crystal of the present invention is determined at a ratio inversely proportional to the amount of change in the HTP value indicating the twisting force of the liquid crystal, which will be described as follows. Can be.
예를 들어 S-811의 첨가량이 Xg, S-1011의 첨가량이 Yg, S-811의 HTP값 변화량이 ΔHx, S-1011의 HTP값 변화량이 -ΔHy라고 할 때, 앞에서 설명된 바와 같이 본 발명의 목적을 실현하기 위해서는 기본적으로 온도에 따른 HTP값의 변화가 없어야 되는 것이므로, 다음과 같은 수학식이 성립될 수 있다.For example, when the amount of addition of S-811 is Xg, the amount of addition of S-1011 is Yg, and the amount of change of HTP value of S-811 is ΔHx and the amount of change of HTP value of S-1011 is -ΔHy, as described above, the present invention In order to realize the purpose of the basically need to change the HTP value according to the temperature, the following equation can be established.
따라서 본 발명에 의하면 제 1 카이랄 도판트인 S-811과 제 2 카이랄 도판트인 S-1011의 첨가량은의 비율로 정하여짐을 알 수 있다.Therefore, according to the present invention, the addition amount of the first chiral dopant S-811 and the second chiral dopant S-1011 is It can be seen that it is determined by the ratio of.
이상에서 설명된 구성 및 작용을 통하여 알 수 있듯이, 본 발명에 의한 액정표시소자는 종래 기술의 문제점을 실질적으로 해소하고 있다.As can be seen through the configuration and operation described above, the liquid crystal display device according to the present invention substantially solves the problems of the prior art.
즉, 본 발명의 카이랄 네마틱 액정은 외부 및 내부 온도의 증감시 액정의 꼬임각을 반대로 변화시키는 제 1 카이랄 도판트 및 제 2 카이랄 도판트의 상호 작용에 의해, 온도의 변화에 관계없이 초기에 설정된 피치(p)를 그대로 유지할 수 있으며, 결과적으로 액정 셀의 두께(d)가 일정하다고 볼 때 d/p값이 안정되므로, 제품의 콘트라스트 및 표시 특성을 향상시키는 효과를 얻게 되는 것이다.That is, the chiral nematic liquid crystal of the present invention is related to the change in temperature by the interaction of the first chiral dopant and the second chiral dopant which reversely change the twist angle of the liquid crystal when the external and internal temperatures are increased or decreased. It is possible to maintain the initially set pitch p as it is, and as a result, since the d / p value is stabilized when the thickness d of the liquid crystal cell is constant, the effect of improving the contrast and display characteristics of the product is obtained. .
Claims (10)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980018333A KR100294490B1 (en) | 1998-05-21 | 1998-05-21 | Liquid crystal display |
| JP11018119A JPH11323338A (en) | 1998-05-21 | 1999-01-27 | Liquid crystal display element and liquid crystalline material therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980018333A KR100294490B1 (en) | 1998-05-21 | 1998-05-21 | Liquid crystal display |
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| KR19990085733A KR19990085733A (en) | 1999-12-15 |
| KR100294490B1 true KR100294490B1 (en) | 2001-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019980018333A KR100294490B1 (en) | 1998-05-21 | 1998-05-21 | Liquid crystal display |
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| JP (1) | JPH11323338A (en) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007037575A1 (en) * | 2005-09-29 | 2007-04-05 | Korea University Industry and Academy Cooperation Foundation | Polar nematic liquid crystal assembly and liquid crystal device using the same |
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| TWI273130B (en) | 2002-10-09 | 2007-02-11 | Dainippon Ink & Chemicals | Liquid crystal composition and liquid crystal display element |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02170136A (en) * | 1988-12-23 | 1990-06-29 | Nec Corp | Thin-film two-terminal element type active matrix liquid crystal display device |
| JPH0588150A (en) * | 1991-09-30 | 1993-04-09 | Sumitomo Chem Co Ltd | Liquid crystal display device |
-
1998
- 1998-05-21 KR KR1019980018333A patent/KR100294490B1/en not_active IP Right Cessation
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1999
- 1999-01-27 JP JP11018119A patent/JPH11323338A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02170136A (en) * | 1988-12-23 | 1990-06-29 | Nec Corp | Thin-film two-terminal element type active matrix liquid crystal display device |
| JPH0588150A (en) * | 1991-09-30 | 1993-04-09 | Sumitomo Chem Co Ltd | Liquid crystal display device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007037575A1 (en) * | 2005-09-29 | 2007-04-05 | Korea University Industry and Academy Cooperation Foundation | Polar nematic liquid crystal assembly and liquid crystal device using the same |
| US7935394B2 (en) | 2005-09-29 | 2011-05-03 | Korea University Industry and Academy Cooperation Foundation | Polar nematic liquid crystal assembly and liquid crystal device using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11323338A (en) | 1999-11-26 |
| KR19990085733A (en) | 1999-12-15 |
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