KR101728350B1 - Cholesteric lcd panel - Google Patents

Cholesteric lcd panel Download PDF

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KR101728350B1
KR101728350B1 KR1020100111686A KR20100111686A KR101728350B1 KR 101728350 B1 KR101728350 B1 KR 101728350B1 KR 1020100111686 A KR1020100111686 A KR 1020100111686A KR 20100111686 A KR20100111686 A KR 20100111686A KR 101728350 B1 KR101728350 B1 KR 101728350B1
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liquid crystal
state
electrodes
display panel
crystal display
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KR20120050263A (en
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송효식
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엘지디스플레이 주식회사
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    • 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
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Abstract

본 발명은 액정표시패널을 개시한다. 특히 본 발명은 수동 매트릭스(passive matrix)방식으로 구동하는 액정표시패널에서 플래너 상태(planer state) 구동시 패널상에 국부적으로 발생하는 포컬 코닉 상태(focal conic state)에 의한 투명도(transparency) 저하현상을 개선한 쌍안정 특성을 가지는 콜레스테릭 액정표시패널에 관한 것이다. The present invention discloses a liquid crystal display panel. Particularly, the present invention relates to a liquid crystal display panel driven by a passive matrix method, in which a transparency degradation phenomenon due to a focal conic state locally occurring on a panel during a planar state driving operation And more particularly to a cholesteric liquid crystal display panel having improved bistable characteristics.

Description

콜레스테릭 액정표시패널{CHOLESTERIC LCD PANEL}CHOLESTERIC LCD PANEL < RTI ID = 0.0 >

본 발명은 액정표시패널에 관한 것으로, 특히 수동 매트릭스(passive matrix)방식으로 구동하는 액정표시패널에서 플래너 상태(planer state) 구동시 패널상에 국부적으로 발생하는 포컬 코닉 상태(focal conic state)에 의한 투명도(transparency) 저하현상을 개선한 쌍안정 특성을 가지는 콜레스테릭 액정표시패널에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel, and more particularly, to a liquid crystal display panel driven by a passive matrix method, in which a focal conic state occurs locally on a panel in a planar state driving The present invention relates to a cholesteric liquid crystal display panel having a bistable characteristic which is improved in transparency degradation phenomenon.

주지된 액정표시패널은, 대향되는 두 개의 투명기판 상에 격자형을 이루도록 배열된 투명전극 라인들과 이 사이에 액정이 개재된 평판표시패널이다. 특히, 개재된 액정 셀에 다수의 얇은 분자층을 가지며 층 내에서 분자 배열이 장축방향이고 층의 면이 평행으로 전체적 나선구조를 이루는 콜레스테릭(Cholesteric) 액정을 적용하는 경우 빛을 선택적으로 반사 또는 투과하는 특성을 가짐으로서 투명 액정표시패널을 구현하는 데 용이하다.A well-known liquid crystal display panel is a flat panel display panel in which transparent electrode lines arranged in a lattice form on two opposed transparent substrates and a liquid crystal interposed therebetween. In particular, when a cholesteric liquid crystal having a plurality of thin molecular layers in an intervening liquid crystal cell and having a molecular array in a long axis direction and a plane parallel to the surface of the liquid crystal cell has a spiral structure, Or transparency, it is easy to realize a transparent liquid crystal display panel.

도 1을 참조하면, 전술한 콜레스테릭 액정은 인가되는 전계에 따라 액정의 사선 축(Helical axis)이 기판면에 대하여 수직방향으로 배열되는 플래너(Planner) 상태(P), 액정의 사선 축이 방향이 기판면에 대하여 일정하지 않지만 거의 평행이 되는 포컬 코닉(focal conic) 상태(F) 및, 액정분자가 기판면에 대하여 수직이 되는 호메오트로픽(Homeotropic) 상태(H)가 되는 특성이 있다. Referring to FIG. 1, the cholesteric liquid crystal described above includes a planner state (P) in which a helical axis of liquid crystal is arranged in a direction perpendicular to a substrate surface according to an applied electric field, The liquid crystal molecules are in a focal conic state (F) in which the liquid crystal molecules are not parallel to the substrate surface but are substantially parallel to the substrate plane, and a homeotropic state (H) in which the liquid crystal molecules are perpendicular to the substrate surface .

먼저 플래너 상태(P)에서는, 액정 셀의 분자들이 주기적인 나선 구조를 가지면서 나선 축(helical axis)이 기판면에 대하여 수직한 방향을 가진다. 이러한 플래너 상태(P)에서는 입사광에 대해 특정 파장의 빛을 선택적으로 반사하는 특성을 가진다. 예를 들면, 우원편광 나선구조를 가진 콜레스테릭 액정이 플래너 상태(P)인 경우, 원편광된 빛이 나선축에 평행하게 입사되면 나선구조와 같은 방향으로 원편광된 빛은 반사되고 반대 방향으로 원편광된 빛은 투과된다. 이러한 특성을 이용하면, 자외선, 가시광선 및 적외선을 선택적으로 투과 또는 반사할 수 있게 된다.First, in the planar state (P), the molecules of the liquid crystal cell have a periodic helical structure and a helical axis has a direction perpendicular to the substrate surface. In this planar state P, there is a characteristic of selectively reflecting light of a specific wavelength with respect to incident light. For example, when the cholesteric liquid crystal having the right circularly polarized helical structure is in the planar state (P), when the circularly polarized light is incident parallel to the helical axis, the circularly polarized light is reflected in the same direction as the helical structure, The circularly polarized light is transmitted. By using such a characteristic, ultraviolet rays, visible rays and infrared rays can be selectively transmitted or reflected.

또한, 포컬 코닉 상태(F)에서는 액정의 나선축이 임의의 방향으로 배열된다. 따라서, 포컬 코닉 상태(F)에서는 입사광에 대해 약한 산란을 일으키며 빛을 투과하는 특성을 가진다. In the focal conic state (F), the helical axis of the liquid crystal is arranged in any direction. Therefore, in the focal conic state (F), light scattering occurs with respect to the incident light and the light is transmitted.

마지막으로, 호메오트로픽 상태(P)는 액정의 분자들의 비틀림 구조가 완전히 풀려 모두 기판면에 대하여 수직으로 배열되게 된다. 이러한 상태에서는 모든 입사광은 반사나 산란을 일으키지 않고 투과하게 된다. Finally, the homeotropic state (P) is such that the twisted structure of the molecules of the liquid crystal is completely relaxed and all are arranged perpendicular to the substrate surface. In this state, all incident light is transmitted without causing reflection or scattering.

전술한 세 가지 상태는 인가하는 전계의 세기와 인가방법에 따라 제어할 수 있다. 배향 처리된 액정 셀에 콜레스테릭 액정을 주입하여 초기상태를 플래너 상태(P) 또는 포컬 코닉 상태(F)중 하나로 설정하고, 적절한 전계를 가하면 전술한 세가지 상태 중 하나로 액정분자의 배열을 변환시켜 액정표시패널이 원하는 투과율 가지도록 조절한다. The three states described above can be controlled according to the intensity of the applied electric field and the application method. The cholesteric liquid crystal is injected into the aligned liquid crystal cell to set the initial state to one of the planar state (P) or the focal conic state (F), and an appropriate electric field is applied to convert the arrangement of the liquid crystal molecules into one of the above three states Adjust the liquid crystal display panel to have the desired transmittance.

예를 들어, 초기상태가 플래너 상태(P)일 때, 이에 높은 전계를 인가하면 포컬 코닉 상태(F)로 전이하며, 전계를 더욱 증가시키면 호메오트로픽 상태(H)로 전이하게 된다. 또한 초기상태가 포컬 코닉 상태(F)이면, 전계의 인가에 따라 호메오트로픽 상태(H)가 된다.For example, when the initial state is the planar state (P), a high electric field is applied to the focal conic state (F), and when the electric field is further increased, the state transitions to the homeotropic state (H). When the initial state is the focal conic state (F), the homeotropic state (H) is obtained according to the application of the electric field.

또한, 호메오트로픽 상태(H)의 액정에 인가된 전계를 천천히 감소시키면 포컬 코닉 상태(F)를 얻을 수 있고, 전계를 빠르게 감소시키면 플래너 상태(P)를 얻을 수 있다. 이때, 플래너 상태(P) 및 포컬코닉 상태(F)는 전계를 제거한 후에도 그 상태를 계속 유지하려는 쌍안정(bistable) 특성이 있으며, 이는 콜레스테릭 액정의 메모리(memory) 특성에 기인한다. Further, if the electric field applied to the liquid crystal of the homeotropic state H is slowly reduced, the focal conic state F can be obtained, and if the electric field is rapidly reduced, the planar state P can be obtained. At this time, the planar state (P) and the focal conic state (F) have a bistable characteristic to keep the state after the electric field is removed, which is caused by the memory characteristics of the cholesteric liquid crystal.

도 2는 종래의 단순 매트릭스 콜레스테릭 액정표시패널의 전극형태를 개략적으로 도시한 도면이다. FIG. 2 is a schematic view showing an electrode shape of a conventional simple matrix cholesteric liquid crystal display panel.

도면을 참조하면, 스캔전극(10) 및 소스전극(20)이 격자형 형태를 이루는 단순 매트릭스(passive matrix)방식의 콜레스테릭 액정표시패널은, 초기상태에서 플래너 상태(P)로의 전이시 상하전극이 교차되어 화소를 이루는 부분(30)은 전극간에 형성되는 전계(E)에 의해 플래너 상태(P)가 되나, 상하전극이 교차되지 않는 부분, 즉 각 전극이 중첩되지 않은 부분(40)에서도 약한 전계(E1)가 형성되어 해당 부분이 원하지 않은 포컬 코닉 상태(F)가 된다. 이러한 포컬 코닉 상태(F)에 의해 빛이 산란됨으로서 해당부분(40)이 불투명상태가 되며, 만약 플래너 상태(P)를 통해 액정패널을 투명상태로 구동하고자 하는 경우, 해당부분(40)에서 예상치 못한 빛의 산란이 발생하게 되어, 관측자가 식별할 수 있을 정도의 불투명 영역이 화면상에 표시되는 문제점이 발생하게 된다.A passive matrix type cholesteric liquid crystal display panel in which the scan electrode 10 and the source electrode 20 are in a lattice form is formed in a state in which the transition from the initial state to the planar state (P) The portion 30 forming the pixel is formed by the electric field E formed between the electrodes to be in the planar state P. However, in the portion where the upper and lower electrodes do not cross, that is, the portion 40 where the electrodes are not overlapped A weak electric field E 1 is formed and the portion becomes an undesired focal conic state F. When the light is scattered by the focal conic state F, the corresponding part 40 becomes opaque. If the liquid crystal panel is to be driven in a transparent state through the planar state P, Scattering of light is generated, and a problem arises that an opaque region that can be discerned by an observer is displayed on the screen.

본 발명은 전술한 문제점을 해결하기 위해 안출된 것으로, 쌍안정 특성을 가지는 콜레스테릭 액정표시패널의 구동시 초기상태 이후, 플래너 상태로 전이시에 화면상에 국부적으로 발생하는 투명도 저하현상을 최소화하기 위한 콜레스테릭 액정표시패널을 제공하는 데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a cholesteric liquid crystal display panel having bistable characteristics that minimizes the transparency degradation that occurs locally on the screen And an object of the present invention is to provide a cholesteric liquid crystal display panel.

전술한 목적을 달성하기 위해, 본 발명의 바람직한 실시예에 따른 콜레스테릭 액정표시패널은, 복수의 제1전극이 구비된 상부기판, 제1전극과 직교하는 복수의 제2전극이 구비된 하부기판 및 상부기판과 하부기판 사이에 개재된 콜레스테릭 액정 셀을 포함한다.In order to achieve the above object, a cholesteric liquid crystal display panel according to a preferred embodiment of the present invention includes an upper substrate having a plurality of first electrodes, a lower substrate having a plurality of second electrodes orthogonal to the first electrodes, And a cholesteric liquid crystal cell interposed between the upper substrate and the lower substrate.

또한, 복수의 제1전극과 복수의 제2전극이 각각 중첩되는 영역에는 화소부가 구성되고, 화소부가 구성된 영역을 제외한 복수의 제1전극과 복수의 제2전극 각각에는 슬릿 형태의 개구부가 구성된다.A pixel portion is formed in a region where the plurality of first electrodes and the plurality of second electrodes overlap each other, and a slit-shaped opening portion is formed in each of the plurality of first electrodes and the plurality of second electrodes, .

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본 발명의 바람직한 실시예에 따르면, 쌍안정 특성을 가지는 액정표시패널의 구동시, 초기상태이후 쌍안정 모드에서 플래너 상태로의 전이시 화면상에 발생하는 투명도 저하현상을 최소화할 수 있는 효과가 있다. According to the preferred embodiment of the present invention, when driving a liquid crystal display panel having bistable characteristics, transparency degradation occurring on the screen at the time of transition from the bistable mode to the planar state after the initial state can be minimized .

도 1은 콜레스테릭 액정의 배열형태를 개략적으로 도시한 도면이다.
도 2는 종래의 패시브 매트릭스 액정표시패널의 전극형태를 개략적으로 도시한 도면이다.
도 3은 본 발명의 실시예에 따른 쌍안정 특성을 가지는 액정표시패널의 구조를 개략적으로 도시한 도면이다.
도 4는 콜레스테릭 액정표시장치 전압(V)-투과율(T) 특성을 그래프 형태로 나타낸 도면이다.
도 5는 종래의 개구부가 없는 액정표시패널과 본 발명의 실시예에 따른 개구부를 구비한 액정표시패널의 쌍안정 상태에서의 액정 셀에 형성된 전계의 형태를 도시한 도면이다.
도 6은 도 3에 도시한 액정표시패널의 VI 부분을 확대한 도면이다.Fig. 1 is a view schematically showing an arrangement form of a cholesteric liquid crystal.
2 is a view schematically showing an electrode shape of a conventional passive matrix liquid crystal display panel.
3 is a schematic view illustrating a structure of a liquid crystal display panel having a bistable characteristic according to an embodiment of the present invention.
4 is a graph showing the cholesteric liquid crystal display voltage (V) -transmittance (T) characteristics.
5 is a view showing a form of an electric field formed in a liquid crystal cell in a bistable state of a conventional liquid crystal display panel having no opening portion and a liquid crystal display panel having an opening portion according to an embodiment of the present invention.
6 is an enlarged view of the VI portion of the liquid crystal display panel shown in Fig.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예에 따른 쌍안정 특성을 가지는 콜레스테릭 액정표시패널을 상세히 설명한다. Hereinafter, a cholesteric liquid crystal display panel having a bistable characteristic according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

통상적으로, 액정표시장치의 구동방식 중 수동 매트릭스(passive matrix) 방식과 박막 트랜지스터(thin film transistor, TFT)를 이용한 능동 구동(active matrix) 방식이 있다. 단순 매트릭스 방식은 액정 셀과 수평방향으로 연결된 복수의 스캔전극과, 수직방향으로 연결되어 스캔전극과 격자형태로 직교하도록 형성되는 소스전극을 구비하고, 각 전극을 선택하여 구동하는 방식이다. 능동 구동 방식은 액정 셀에 TFT 및 저장 커패시터를 마련하여 커패시터에 저장된 용량에 의해 액정 셀에 인가되는 전계를 유지시키는 방식이다. 이하에서는, 전술한 구동방식 중 구조가 단순하여 투명 액정표시패널에 적합한 수동 매트릭스 방식을 적용한 일 예로서 본 발명의 실시예를 설명한다.Typically, a passive matrix method and an active matrix method using a thin film transistor (TFT) are among driving methods of a liquid crystal display device. The simple matrix method includes a plurality of scan electrodes connected in a horizontal direction with the liquid crystal cell, and a source electrode connected in a vertical direction so as to be orthogonal to the scan electrode in a lattice pattern, and each electrode is selected and driven. In the active driving method, a TFT and a storage capacitor are provided in a liquid crystal cell to maintain the electric field applied to the liquid crystal cell by the capacitance stored in the capacitor. Hereinafter, embodiments of the present invention will be described as an example in which a passive matrix method suitable for a transparent liquid crystal display panel is applied to a simple structure among the above driving methods.

도 3은 본 발명의 실시예에 따른 쌍안정 특성을 가지는 액정표시패널의 구조를 개략적으로 도시한 도면이다. 3 is a schematic view illustrating a structure of a liquid crystal display panel having a bistable characteristic according to an embodiment of the present invention.

도시한 바와 같이, 본 발명의 쌍안정 특성을 가지는 액정표시패널은 투명전극인 ITO 또는 IZO로 형성되는 다수의 스캔전극(100)이 수평방향으로 배치되는 하부기판과, 다수의 소스전극(200)이 스캔전극(100)과 직교하는 방향으로 배치되어 하부기판과 소정거리 이격되어 대향하도록 합착되는 상부기판 및, 상/하부 기판사이에 개재되는 콜레스테릭상의 액정으로 구성된다. 이러한 구성을 통해 스캔전극(100)과 데이터전극(200)이 교차하여 중첩되는 부분에 화소부(P)를 형성하고, 각 화소부(P)에 인가되는 신호에 따라 액정 셀의 광 굴절율이 변화함으로서 광을 투과하거나 반사하여 화상을 표시하게 된다.As shown in the figure, the liquid crystal display panel having the bistable characteristics of the present invention includes a lower substrate on which a plurality of scan electrodes 100 formed of ITO or IZO which are transparent electrodes are arranged in a horizontal direction, a plurality of source electrodes 200, An upper substrate arranged in a direction orthogonal to the scan electrode 100 and bonded to the lower substrate so as to face each other with a predetermined distance therebetween and a cholesteric liquid crystal interposed between the upper and lower substrates. In this structure, the pixel portion P is formed in a portion where the scan electrode 100 and the data electrode 200 intersect and overlap each other, and the light refractive index of the liquid crystal cell changes according to a signal applied to each pixel portion P So that light is transmitted or reflected to display an image.

또한, 도시하지는 않았지만 액정표시패널의 외측으로 구비되고 전술한 스캔전극(100) 및 소스전극(200)과 전기적으로 연결되어 스캔신호 및 데이터신호를 제공하는 스캔드라이버 및 데이터드라이버가 더 구비될 수 있다.Although not shown, a scan driver and a data driver, which are provided outside the liquid crystal display panel and are electrically connected to the scan electrode 100 and the source electrode 200 to provide a scan signal and a data signal, may be further provided .

이러한 액정표시패널은 선순차 구동방식 또는 멀티라인 방식으로 구동될 수 있다. 상세하게는, 선순차 구동방식은 하나의 스캔전극(100)마다 순차적으로 소정의 스캔신호를 인가하고, 각 행에 스캔신호가 인가될 때 복수의 소스전극(200)에 해당하는 데이터신호를 동시에 인가함으로서 영상을 표시하는 구동방식이다. 또한, 멀티라인 구동방식은 모든 스캔전극(100)을 복수의 서브그룹으로 분할 한 후에 서브그룹마다 소정의 스캔신호를 순차적으로 인가하고 각 서브그룹에 스캔신호가 인가될 때 복수의 데이터전극(200)에 해당하는 데이터신호를 동시에 인가함으로써 영상을 표시하는 구동방식이다.Such a liquid crystal display panel can be driven by a line-sequential driving method or a multi-line method. More specifically, in the line-sequential driving method, a predetermined scan signal is sequentially applied to each scan electrode 100. When a scan signal is applied to each row, data signals corresponding to the plurality of source electrodes 200 are simultaneously It is a driving method that displays images by applying a voltage. In addition, the multi-line driving method divides all the scan electrodes 100 into a plurality of sub-groups, sequentially applies a predetermined scan signal to each sub-group, and applies a plurality of data electrodes 200 ) At the same time to display an image.

도면을 참조하면, 본 발명의 액정표시패널에는 각 스캔전극(100)과 소스전극(200)이 격자형으로 중첩되며, 각 전극(100, 200)의 중첩되는 부분은 각각 하나의 화소영역을 형성하는 데, 일 전극(100)이 타 전극(200)과 중첩되지 않는 영역에 슬릿(slit)형태의 개구부(110, 210)가 형성된다. 이러한 개구부(210)는 전극(100, 200)의 비 중첩부분에 대하여 동일하게 형성되며, 각 전극(100, 200)의 패터닝시 동일 마스크를 통해 동시에 패터닝되는 방식으로 형성되는 것이 바람직하다.Referring to the drawings, in the liquid crystal display panel of the present invention, the scan electrodes 100 and the source electrodes 200 are overlapped in a lattice form, and overlapping portions of the electrodes 100 and 200 form one pixel region And slit-shaped openings 110 and 210 are formed in an area where the one electrode 100 does not overlap with the other electrode 200. [ The openings 210 are formed in the same manner with respect to the non-overlapping portions of the electrodes 100 and 200 and are formed in such a manner that the openings 210 are simultaneously patterned through the same mask when the respective electrodes 100 and 200 are patterned.

또한, 전술한 화소부(P) 및 개구부(110, 210)를 제외한 부분은 전극이 배치되지 않아 전계가 형성되지 않는 화상이 표현되지 않는 부분이다. The portion excluding the above-described pixel portion P and the openings 110 and 210 is a portion in which an electrode is not disposed and an image in which no electric field is formed is not represented.

전술한 구조의 본 발명의 콜레스테릭 액정표시패널은 해당 드라이버의 제어에 따라, 먼저 스캔전극(100)이 순차적으로 하나의 행 씩 스캔신호를 제공하고, 이와 동시에 데이터전극(200)이 데이터신호를 제공하면 각 전극의 전압차에 따라, 각 화소부(300)에 대응하는 액정 셀에는 액정상을 변환하는 전계가 형성되어 화상을 표시한다. In the cholesteric liquid crystal display panel of the present invention having the above-described structure, the scan electrodes 100 sequentially scan signals one row at a time according to the control of the corresponding driver, and at the same time, An electric field for converting the liquid crystal phase is formed in the liquid crystal cells corresponding to the respective pixel units 300 according to the voltage difference between the respective electrodes to display an image.

이러한 콜레스테릭 액정표시패널은 도 4에 도시한 전압(V)-투과율(T) 그래프의 특성을 가진다. 상세하게는, 콜레스테릭 액정은 각 전극에 인가된 전계가 약 0V 내지 8V에서 플래너 상태(P) 또는 포컬 코닉 상태(F) 중 하나인 초기상태를 유지하다가, 전계가 약 9V 내지 16V 사이에서 포컬 코닉(F)상태에 대응하는 투과율을 가지게 되며, 17V 이상에서 호메오트로픽 상태(H)에 대응하는 투과율을 가지게 된다. 이후, 쌍안성 모드의 진입을 위해 전계를 빠르게 제거하거나 또는 천천히 제거하는 경우, 각각 플래너 상태(P) 또는 포컬코닉 상태(F)로 전이된다.Such a cholesteric liquid crystal display panel has characteristics of a voltage (V) -transmittance (T) graph shown in Fig. Specifically, the cholesteric liquid crystal maintains an initial state in which the electric field applied to each electrode is one of the planar state (P) and the focal conic state (F) at about 0 V to 8 V, and the electric field is maintained at about 9 V to 16 V Has a transmittance corresponding to the focal conic state (F), and has a transmittance corresponding to the homeotropic state (H) at 17 V or higher. Thereafter, when the electric field is quickly removed or slowly removed to enter the bi-static mode, it is transferred to the planar state (P) or the focal conic state (F), respectively.

이러한 액정상태를 표로 정리하면 다음과 같다.The states of the liquid crystal states are summarized as follows.

Figure 112010073457292-pat00001
Figure 112010073457292-pat00001

표 1에 기재된 바와 같이, 액정 셀에 초기상태에서 8V이하, 9V 내지 16V 사이 및, 17V 이상의 전압차를 가지는 스캔 및 데이터신호를 인가하면, 액정 셀은 각각 초기상태 유지, 포컬 코닉 상태(F) 전환 및 호메오트로픽(H) 상태로 전환된다.As shown in Table 1, when scan and data signals having a voltage difference of 8V or less, 9V to 16V, and 17V or more are applied to the liquid crystal cell in the initial state, the liquid crystal cells maintain their initial states, the focal conic state F, Transition and homeotropic (H) state.

이후, 설정자는 OV 로의 전압 인가방법을 달리하여 선택적으로 액정표시패널을 플래너 상태(P) 또는 포컬 코닉 상태(F)로 구동할 수 있으며 원하는 액정상을 얻을 수 있다. 즉, 이하의 표 2를 참조하면,Thereafter, the configurator can selectively drive the liquid crystal display panel in the planar state (P) or the focal conic state (F) by applying a voltage application method to the OV and obtain a desired liquid crystal image. That is, referring to Table 2 below,

Figure 112010073457292-pat00002
Figure 112010073457292-pat00002

액정표시패널을 쌍안정 모드의 플래너 상태(P)로 구동하고자 하는 경우, 먼저 스캔전극(100) 및 데이터전극(200)을 통해 화소부(300)에 구동을 위한 스캔신호 및 데이터신호를 입력하여 액정 셀에 18V 이상의 전계를 형성하여 화소부(300)의 액정은 18V 이상의 전계에 따른 호메오트로픽(H) 상태로 전환한다. In order to drive the liquid crystal display panel in the planar state P of the bistable mode, a scan signal and a data signal for driving are input to the pixel portion 300 through the scan electrode 100 and the data electrode 200 An electric field of 18 V or more is formed in the liquid crystal cell, and the liquid crystal of the pixel portion 300 is converted into a homeotropic (H) state according to an electric field of 18 V or more.

이때, 각 전극에 형성된 개구부(100, 210) 영역에는 상하부로 전극이 존재하지 않으며, 이에 따라 개구부(100, 210)의 액정 셀에는 0V 내지 8V의 전계가 미약하게 형성되어 표 1에 기재된 바와 같이 초기상태가 유지된다.At this time, no electrodes are present in the upper and lower portions of the openings 100 and 210 formed in the respective electrodes, and thus an electric field of 0 V to 8 V is weakly formed in the liquid crystal cells of the openings 100 and 210, The initial state is maintained.

이후, 각 전극에 입력되는 신호를 조절하여 액정 셀에 인가된 전계를 0V 로 빠르게 제거하면, 화소부(300)에 대응하는 부분의 액정은 호메오트로픽(H) 상태에서 쌍안정 모드의 진입에 따라 플래너 상태(P)로 전환되며, 개구부(100, 210)에 해당하는 부분은 표 2에 기재된 바와 같이 이전상태인 초기상태를 유지하게 된다. When the electric field applied to the liquid crystal cell is rapidly removed to 0 V by adjusting the signals inputted to the respective electrodes, the liquid crystal in the portion corresponding to the pixel portion 300 is in the homeotropic (H) state and enters the bistable mode The planar state P is changed to the planar state P and the portion corresponding to the openings 100 and 210 is maintained in the initial state as shown in Table 2. [

다시 말하면, 초기상태가 플래너 상태(P)로 배향된 액정표시패널을 쌍안정 모드로 구동하기 위해 각 전극에 18V 이상의 전압차를 가지는 신호를 인가하면 화소부의 액정 셀은 호메오트로픽 상태로 변환되며, 이와 동시에 개구부(100, 210)의 액정 셀은 0V 내지 8V의 전계가 형성되어 초기상태인 플래너 상태(P)가 유지되며, 이후, 각 전극의 전압차를 0V로 천천히 낮추면 화소부(300)는 플래너 상태(P)로 전환되며, 개구부(100, 210)의 액정 셀은 이전 상태가 플래너 상태(P)이므로, 0V 에서도 포컬 코닉(F)상태가 아닌 플래너 상태(P)가 유지되게 된다.In other words, if a signal having a voltage difference of 18 V or more is applied to each electrode to drive the liquid crystal display panel whose initial state is aligned in the planar state (P) in the bistable mode, the liquid crystal cell of the pixel portion is converted into the homeotropic state The liquid crystal cell of each of the openings 100 and 210 forms an electric field of 0 V to 8 V to keep the planar state P in an initial state and then gradually decreases the voltage difference between the electrodes to 0 V, The planar state P of the liquid crystal cells of the openings 100 and 210 is maintained in the planar state P and not in the focal conic state F even at 0 V since the previous state is the planar state P.

도 5는 종래의 개구부가 없는 액정표시패널과 본 발명의 실시예에 따른 개구부를 구비한 액정표시패널의 쌍안정 상태에서의 액정 셀에 형성된 전계의 형태를 도시한 도면으로서, 도시한 바와 같이 개구부가 없는 종래의 액정표시패널(A)의 쌍안정 모드에서 화소부 부분은 플래너 상태(P)가 유지되나, 화소부를 제외한 전극이 중첩되지 않은 부분에서는 포컬 코닉 상태(F)가 유지된다. 반면, 본 발명의 개구부를 구비한 본 발명의 액정표시패널(B)에서 화소부 부분은 플래너 상태(P)이며 또한 개구부 부분은 초기상태가 계속 유지된다. 5 is a view showing a form of an electric field formed on a liquid crystal cell in a bistable state of a liquid crystal display panel having no opening portion and a liquid crystal display panel having an opening portion according to an embodiment of the present invention, The planar state P is maintained in the pixel portion portion in the conventional liquid crystal display panel A without the pixel portion, but the focal conic state F is maintained in the portion where the electrodes other than the pixel portion are not overlapped. On the other hand, in the liquid crystal display panel (B) of the present invention having the openings of the present invention, the pixel portion is in the planar state (P) and the opening portion is kept in the initial state.

포컬 코닉 상태(F)로의 전환을 위한 9V~15V의 전압을 인가한다. 이에 따라, 화소부(300)를 이루는 양 전극(100, 200)에는 인가된 전압에 대응하는 레벨의 전계가 형성되어 이에 대응하는 위치의 액정 셀은 플래너 상태(P) 또는 포컬 코닉 상태로 전환된다. 이때, 화소부(300)를 제외한 개구부(110, 210)에 대응하는 액정 셀에는 근접한 화소부(300)의 에지부분에서 형성되는 6V 내지 9V 전압이 인가되어 이전 초기상태를 그대로 유지하게 된다.A voltage of 9V to 15V is applied for switching to the focal conic state (F). Accordingly, an electric field of a level corresponding to the applied voltage is formed on both electrodes 100 and 200 constituting the pixel portion 300, and the liquid crystal cell corresponding to the voltage is switched to the planar state P or the focal conic state . At this time, a voltage of 6V to 9V formed at the edge portion of the pixel portion 300 adjacent to the liquid crystal cell corresponding to the openings 110 and 210 excluding the pixel portion 300 is applied, and the previous initial state is maintained.

현재 상태에서 액정 셀을 쌍안정 모드로 전환하기 위해, 각 전극(100, 200)이 화소부(300)에 인가하는 전압을 빠르게 또는 천천히 0V로 낮추면, 이에 대응하는 액정셀은 쌍안정 모드로서 콜레스테릭 액정의 특성에 따라 소정기간 동안 이전상태를 유지하게 된다.When the voltage applied to the pixel unit 300 by the electrodes 100 and 200 is rapidly or slowly lowered to 0 V in order to switch the liquid crystal cell to the bistable mode in the current state, The previous state is maintained for a predetermined period of time in accordance with the characteristics of the steric liquid crystal.

따라서, 화소부(300)의 액정셀이 전 단계에서 플래너 상태(P)인 경우 계속 플래너 상태(P)가 된다. 이때, 각 전극(100, 200)에서 화소부(300)를 제외한 슬릿형태의 개구부(110, 210)에 대응하는 액정셀에는 이전 상태인 초기상태가 그대로 유지된다.Accordingly, when the liquid crystal cell of the pixel unit 300 is in the planar state P in the preceding step, the planar state P is maintained. At this time, in the liquid crystal cells corresponding to the slit-shaped openings 110 and 210 except for the pixel portion 300, the initial state of the previous state is maintained.

도 6은 도 3에 도시한 액정표시패널의 VI 부분을 확대한 도면이다.6 is an enlarged view of the VI portion of the liquid crystal display panel shown in Fig.

도면을 참조하면, 본 발명의 액정표시패널은 복수의 스캔전극(100) 및 데이터전극(200)의 일부가 직교하며, 중첩되는 영역에 화소부(P)를 정의하고, 스캔전극(100) 또는 데이터전극(200) 중 하나가 배치되지 않은 영역 즉, 각 전극에서 화소부(P)를 제외한 영역에는 개구부(110, 210)가 형성된다. 또한, 각 전극 모두 배치되지 않는 영역에는 비표시부(N)가 형성된다. Referring to the drawings, a liquid crystal display panel according to the present invention includes a plurality of scan electrodes 100 and a plurality of data electrodes 200. The scan electrodes 100 and the data electrodes 200 are orthogonal to each other, Openings 110 and 210 are formed in a region where one of the data electrodes 200 is not disposed, that is, a region except for the pixel portion P in each electrode. In addition, non-display portions N are formed in regions where all the electrodes are not arranged.

이러한 구조에서, 3.2인치 이하 소형 액정표시패널을 기준으로 스캔전극(100) 및 데이터전극(200)의 폭은 240㎛(micro metre)인 것이 바람직하며, 이 경우 각 화소부를 연결하는 연결부(130, 230)는 적어도 4㎛보다 작은 폭을 가지도록 형성하는 것이 바람직하다. In this structure, it is preferable that the width of the scan electrode 100 and the data electrode 200 is 240 μm (micrometer) on the basis of a small-sized liquid crystal display panel of 3.2 inches or less. In this case, 230 are preferably formed to have a width of at least 4 mu m.

전술한 구조에 따라, 본 발명의 바람직한 실시예에 따른 쌍안정 특성을 가지는 액정표시패널은 스캔전극 및 데이터전극이 중첩되지 않는 부분에 개구부에 의해 원치 않는 전계형성을 방지함으로서, 액정표시패널의 쌍안정 모드에서 플래너 상태로 전이시에 화면상에 국부적으로 발생하는 투명도 저하현상을 제거할 수 있다.According to the above-described structure, in the liquid crystal display panel having the bistable characteristics according to the preferred embodiment of the present invention, an unwanted electric field is prevented from being formed due to the opening portion in the portion where the scan electrode and the data electrode are not overlapped, It is possible to eliminate the transparency degradation phenomenon that occurs locally on the screen when transitioning from the stable mode to the planar state.

이상에서 본 발명의 바람직한 실시예에 대하여 상세하게 설명하였지만, 당해 기술 분야에서 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 수 있을 것이다. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

100 : 스캔전극 200 : 데이터전극
110, 210 : 개구부 130, 230 : 연결부
300 : 화소부100: scan electrode 200: data electrode
110, 210: openings 130, 230:
300:

Claims (6)

일면에 일방향으로 복수의 제1 전극이 구비된 상부기판;
상기 상부기판과 소정거리 이격되어 대향하며 상기 제1 전극과 직교하는 복수의 제2 전극이 구비된 하부기판;
상기 상부기판 및 하부기판 사이에 개재되는 콜레스테릭 액정 셀;
상기 제1전극과 상기 제2전극이 중첩되는 영역에 구성된 화소부; 및
상기 화소부 이외의 영역에서 상기 제1전극과 상기 제2전극 각각에 구성된 슬릿 형태의 개구부를 포함하는 콜레스테릭 액정표시패널.An upper substrate having a plurality of first electrodes formed on one surface thereof in one direction;
A lower substrate opposed to the upper substrate by a predetermined distance and having a plurality of second electrodes orthogonal to the first electrode;
A cholesteric liquid crystal cell interposed between the upper substrate and the lower substrate;
A pixel portion formed in a region where the first electrode and the second electrode overlap; And
And a slit-shaped opening formed in each of the first electrode and the second electrode in a region other than the pixel portion. 제 1 항에 있어서,
상기 제1 및 제2 전극은, 인듐 주석산화물(Indium Tin Oxide, ITO) 또는 인듐 아연산화물(Indium Zinc Oxide, IZO) 중 하나인 콜레스테릭 액정표시패널.The method according to claim 1,
Wherein the first and second electrodes are one of indium tin oxide (ITO) or indium zinc oxide (IZO). 제 1 항에 있어서,
상기 제1 및 제2 전극의 폭이 240㎛(micro metre) 이상일 경우, 상기 화소부는 4㎛ 이하의 폭을 가지는 하나이상의 연장부를 통해 서로 연결되는 콜레스테릭 액정표시패널.The method according to claim 1,
And the pixel portion is connected to each other via at least one extension portion having a width of 4 mu m or less when the width of the first and second electrodes is 240 mu m or more. 제 1 항에 있어서,
상기 액정 셀은,
초기상태가 플래너 상태(Planner)인 콜레스테릭 액정표시패널.The method according to claim 1,
In the liquid crystal cell,
A cholesteric liquid crystal display panel in which an initial state is a planner state (Planner). 제 4 항에 있어서,
상기 화소부에 대응되는 액정 셀이 호메오트로픽 상태(Homeotropic)가 되도록 상기 제1 및 제2 전극에 18V 이상의 전계를 형성하는 경우, 상기 개구부에 대응되는 액정 셀은 플래너 상태(Planner)인 콜레스테릭 액정표시패널.5. The method of claim 4,
When an electric field of 18V or more is formed on the first and second electrodes so that the liquid crystal cell corresponding to the pixel unit is in a homeotropic state, the liquid crystal cell corresponding to the opening is in a planar state, Rick LCD display panel. 제 5 항에 있어서,
상기 화소부에 대응되는 액정 셀이 플래너 상태(Planner)가 되도록 상기 제1 및 제2 전극에 0V 의 전계를 형성하는 경우, 상기 개구부에 대응되는 액정 셀은 플래너 상태(Planner)를 유지하는 콜레스테릭 액정표시패널.6. The method of claim 5,
When an electric field of 0V is formed in the first and second electrodes so that the liquid crystal cell corresponding to the pixel unit is in a planner state, the liquid crystal cell corresponding to the opening part has a cholesteric Rick LCD display panel.
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