KR100446379B1 - Fringe Field Switching Liquid Crystal Display device - Google Patents
Fringe Field Switching Liquid Crystal Display device Download PDFInfo
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- KR100446379B1 KR100446379B1 KR10-2001-0017174A KR20010017174A KR100446379B1 KR 100446379 B1 KR100446379 B1 KR 100446379B1 KR 20010017174 A KR20010017174 A KR 20010017174A KR 100446379 B1 KR100446379 B1 KR 100446379B1
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- 230000005684 electric field Effects 0.000 description 10
- 239000004020 conductor Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
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- 239000010409 thin film Substances 0.000 description 1
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- G—PHYSICS
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- 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
- G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/124—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
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- 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
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134372—Electrodes characterised by their geometrical arrangement for fringe field switching [FFS] where the common electrode is not patterned
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Abstract
본 발명은 프린지 필드 스위칭 액정표시장치에 관한 것으로, 액정층을 사이에 두고 소정 거리 대향 배치되어 화소를 구성하는 상부 및 하부기판과; 공통신호 인가를 위한 슬릿형으로 형성된 투명한 공통전극과; 상기 공통전극과 절연막의 개재하에 이격되면서, 상기 공통전극과 함께 액정층내 액정분자를 구동시키기 위한 프린지 필드를 형성하며, 상기 절연막상에 슬릿형으로 형성된 투명한 화소전극을 포함하여 구성되는 프린지 필드 스위칭 액정표시장치에 있어서, 상기 화소는 적어도 2부분 이상으로 분할되어 적어도 1부분은 상기 공통전극과 화소전극이 하부기판 또는 절연막상에 배치되어 있고, 적어도 나머지 1부분은 상기 공통전극과 화소전극 각각이 상기 하부기판 또는 절연막상에 상하로 중첩되지 않게 배치되어 있으며, 상기 하부기판상의 공통전극 및 화소전극의 형상 및 배치가 변경되므로써 잔상이 감소되고, 또한, 화소의 일정부분은 공통전극과 화소전극의 위치가 역전되어 있어서 잔류 직류성분이 상쇄되는 것이다. 한편, 공통전극과 화소전극을 상하 중첩되지 않게 배치함으로써 전극간의 전계 세기를 종래보다 상당부분 약화시켜 잔상이 감소되고, 이와 같이 잔상 특성이 개선되어 장시간 고정화면을 띄워도 잔상이 남지 않게 되는 것이다.The present invention relates to a fringe field switching liquid crystal display device, comprising: upper and lower substrates disposed opposite to a predetermined distance with a liquid crystal layer interposed therebetween to constitute a pixel; A transparent common electrode formed in a slit shape for applying a common signal; A fringe field switching liquid crystal is formed between the common electrode and the insulating layer while being spaced apart, and forms a fringe field for driving the liquid crystal molecules in the liquid crystal layer together with the common electrode, and includes a transparent pixel electrode formed in a slit shape on the insulating layer. In the display device, the pixel is divided into at least two parts, at least one part of which the common electrode and the pixel electrode are disposed on a lower substrate or an insulating layer, and at least one part of the common electrode and the pixel electrode, respectively, It is disposed on the lower substrate or the insulating layer so as not to overlap each other, and afterimage is reduced by changing the shape and arrangement of the common electrode and the pixel electrode on the lower substrate, and the predetermined part of the pixel is located at the position of the common electrode and the pixel electrode. Is reversed, and the residual DC component is canceled out. On the other hand, by arranging the common electrode and the pixel electrode so that they do not overlap with each other, the field strength between the electrodes is considerably weakened compared to the prior art, and the afterimage is reduced. As a result, the afterimage is improved so that no afterimage remains after a long fixed screen is displayed.
Description
본 발명은 액정표시장치에 관한 것으로, 보다 구체적으로는 잔상을 방지할 수 있는 프린지 필드 스위칭 액정표시장치(Fringe Field Switching Liquid Crystal Display device)에 관한 것이다.The present invention relates to a liquid crystal display device, and more particularly, to a fringe field switching liquid crystal display device capable of preventing afterimages.
일반적으로 프린지 필드 스위칭 액정표시장치는 인 플레인 스위칭 액정표시장치의 낮은 개구율 및 투과율을 개선시키기 위하여 제안된 것이다.In general, fringe field switching liquid crystal displays have been proposed to improve low aperture and transmittance of in-plane switching liquid crystal displays.
이러한 프린지 필드 스위칭 액정표시장치는 공통전극과 화소전극을 투명 전도체로 형성하면서, 공통전극과 화소전극과의 간격을 상,하기판 사이의 간격보다 좁게 형성하여, 공통전극과 화소전극 상부에 프린지 필드(fringe filed)가 형성되도록 하는 것이다.In the fringe field switching liquid crystal display, the common electrode and the pixel electrode are formed of a transparent conductor, and the gap between the common electrode and the pixel electrode is formed to be narrower than the gap between the upper and lower substrates, and the fringe field is formed on the common electrode and the pixel electrode. (fringe filed) is formed.
종래 기술에 따른 프린지 필드 스위칭 액정표시장치를 도 1을 참조하여 설명하면 다음과 같다.A fringe field switching liquid crystal display according to the prior art will be described with reference to FIG. 1.
종래 기술에 따른 프린지 필드 스위칭 액정표시장치는, 도 1에 도시된 바와 같이, 하부기판(100)과 상부기판(114)이 소정 거리를 두고 대향 배치되어 있다. 여기서, 하부기판(100)과 상부기판(114)의 이격된 거리를 이하 셀 갭(cell gap)이라 칭한다.In the fringe field switching liquid crystal display according to the related art, as shown in FIG. 1, the lower substrate 100 and the upper substrate 114 are disposed to face each other at a predetermined distance. Here, the distance between the lower substrate 100 and the upper substrate 114 is referred to as a cell gap hereinafter.
또한, 상기 하부기판(100)과 상부기판(114) 사이에는 액정층(110)이 개재되어 있고, 하부기판(100) 상에는 공통전극(102)이 배치되어 있다. 여기서,공통전극(102)은 투명 전도체, 예를 들어, ITO(indium tin oxide)를 사용하여 플레이트(plate) 형상으로 형성된다. 공통전극(102)이 형성된 하부기판(100) 상부에는 절연막(104)이 형성되고, 절연막(104)상에는 등간격으로 배치된 슬릿 형상의 화소전극(106)이 형성된다.In addition, the liquid crystal layer 110 is interposed between the lower substrate 100 and the upper substrate 114, and the common electrode 102 is disposed on the lower substrate 100. Here, the common electrode 102 is formed in a plate shape using a transparent conductor, for example, indium tin oxide (ITO). An insulating film 104 is formed on the lower substrate 100 on which the common electrode 102 is formed, and slit-shaped pixel electrodes 106 arranged at equal intervals are formed on the insulating film 104.
그리고, 상기 하부기판(100)의 대향면 최상부 및 상부기판(114)의 대향면 표면에는 액정층(110)내의 액정 분자(미도시)들을 전계가 형성되기 이전 일률적으로 배열시키는 역할을 하는 배향막(108)(112)이 형성되어 있다.In addition, an alignment layer that uniformly arranges liquid crystal molecules (not shown) in the liquid crystal layer 110 on the upper surface of the lower surface of the lower substrate 100 and the opposite surface of the upper substrate 114 before an electric field is formed. 108 and 112 are formed.
이와 같은 구성을 갖는 프린지 필드 스위칭 액정표시장치에 있어서 액정분자(미도시)는, 공통전극(102)과 화소전극(106) 사이에 전계가 형성되기 이전에, 배향막(108)(112)의 영향으로 기판에 거의 수평을 이루도록 배열된다.In the fringe field switching liquid crystal display device having such a configuration, the liquid crystal molecules (not shown) are influenced by the alignment layers 108 and 112 before an electric field is formed between the common electrode 102 and the pixel electrode 106. Are arranged to be nearly horizontal to the substrate.
한편, 공통전극(102)과 화소전극(106) 사이에 전계가 형성되면, 전계의 형태는 수직 성분을 포함하는 프린지 필드가 형성되고, 액정 분자(미도시)들은 그것의 광축이 전계 방향과 수직 또는 수평이 되도록 틀어져서 광을 누설하게 된다.Meanwhile, when an electric field is formed between the common electrode 102 and the pixel electrode 106, a fringe field including a vertical component is formed in the form of the electric field, and the liquid crystal molecules (not shown) have their optical axes perpendicular to the electric field direction. Or it is twisted to be horizontal to leak light.
그러나, 상기와 같은 프린지 필드 스위칭 액정표시장치는 공통전극과 화소전극이 서로 중첩되어 있으므로 강한 전계가 절연막에 집중되고, 특히 상기와 같은 전극구조에 있어서는 전극 사이에 적층된 이온 불순물이 외부로 배출될 통로가 없어 잔상이 심하게 나타나는 문제점이 있다.However, in the fringe field switching liquid crystal display device as described above, since the common electrode and the pixel electrode overlap each other, a strong electric field is concentrated on the insulating film, and in the electrode structure as described above, ion impurities stacked between the electrodes may be discharged to the outside. There is a problem that afterimages appear badly because there is no passage.
따라서, 본 발명의 목적은 전술한 종래의 문제점을 해결하기 위하여 안출된것으로, 본 발명의 목적은 프린지 필드 스위칭 액정표시장치의 공통전극 및 화소전극의 형상 및 배치를 변경하여 잔상을 제거하므로써 화질 특성을 개선시킬 수 있는 프린지 필드 스위칭 액정표시장치를 제공함에 있다.Accordingly, an object of the present invention is to solve the above-mentioned problems, the object of the present invention is to change the shape and arrangement of the common electrode and the pixel electrode of the fringe field switching liquid crystal display device to remove the afterimage To provide a fringe field switching liquid crystal display device that can improve the.
도 1은 종래 기술에 따른 프린지 필드 스위칭 액정표시장치의 전극구조를 도시한 단면도.1 is a cross-sectional view showing an electrode structure of a fringe field switching liquid crystal display device according to the prior art.
도 2는 본 발명의 실시예 1에 따른 프린지 필드 스위칭 액정표시장치의 전극구조를 도시한 단면도.2 is a cross-sectional view showing an electrode structure of a fringe field switching liquid crystal display device according to a first embodiment of the present invention;
도 3은 본 발명의 실시예 2에 따른 프린지 필드 스위칭 액정표시장치의 전극구조를 도시한 단면도.3 is a cross-sectional view showing an electrode structure of a fringe field switching liquid crystal display device according to a second embodiment of the present invention;
도 4는 본 발명의 실시에 3에 따른 프린지 필드 스위칭 액정표시장치의 전극구조를 도시한 단면도.4 is a cross-sectional view showing an electrode structure of a fringe field switching liquid crystal display device according to Embodiment 3 of the present invention;
도 5는 본 발명의 실시예 4에 따른 프린지 필드 스위칭 액정표시장치의 전극구조를 도시한 단면도.5 is a cross-sectional view showing an electrode structure of a fringe field switching liquid crystal display device according to a fourth embodiment of the present invention.
<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>
200; 하부기판 202; 공통전극200; Lower substrate 202; Common electrode
204; 절연막 206; 화소전극204; Insulating film 206; Pixel electrode
208, 212; 배향막 210; 액정층208, 212; Alignment layer 210; Liquid crystal layer
214; 상부기판214; Upper board
상기한 본 발명의 목적을 달성하기 위한 본 발명의 일견지에 따른 프린지 필드 스위칭 액정표시장치는, 액정층을 사이에 두고 소정 거리 대향 배치되어 화소를 구성하는 상부 및 하부기판과; 공통신호 인가를 위한 슬릿형으로 형성된 투명한 공통전극과; 상기 공통전극과 절연막의 개재하에 이격되면서, 상기 공통전극과 함께 액정층내 액정분자를 구동시키기 위한 프린지 필드를 형성하며, 상기 절연막상에 슬릿형으로 형성된 투명한 화소전극을 포함하여 구성되는 프린지 필드 스위칭 액정표시장치에 있어서, 상기 화소는 적어도 2 부분 이상으로 분할되어 적어도 1부분은 상기 공통전극과 화소전극이 상기 하부기판 또는 절연막상에 배치되어 있고, 적어도 나머지 1부분은 상기 공통전극과 화소전극 각각이 상기 하부기판 또는 절연막상에 상하로 중첩되지 않게 배치되어 있는 것을 특징으로 한다.A fringe field switching liquid crystal display device according to an aspect of the present invention for achieving the above object of the present invention comprises: upper and lower substrates disposed to face each other with a liquid crystal layer interposed therebetween to constitute a pixel; A transparent common electrode formed in a slit shape for applying a common signal; A fringe field switching liquid crystal is formed between the common electrode and the insulating layer while being spaced apart, and forms a fringe field for driving the liquid crystal molecules in the liquid crystal layer together with the common electrode, and includes a transparent pixel electrode formed in a slit shape on the insulating layer. In the display device, the pixel is divided into at least two portions, at least one portion of which the common electrode and the pixel electrode are disposed on the lower substrate or the insulating layer, and at least one portion of the pixel which is the common electrode and the pixel electrode, respectively. It is characterized in that it is disposed on the lower substrate or the insulating film so as not to overlap up and down.
또한, 상기한 본 발명의 목적을 달성하기 위한 본 발명의 다른 견지에 따른 프린지 필드 스위칭 액정표시장치는, 액정층을 사이에 두고 소정 거리 대향 배치되어 다수개의 화소를 구성하는 상부 및 하부기판과; 공통신호 인가를 위한 슬릿형으로 형성된 투명한 공통전극과; 상기 공통전극과 절연막의 개재하에 이격되면서, 상기 공통전극과 함께 액정층내 액정분자를 구동시키기 위한 프린지 필드를 형성하며, 상기 절연막상에 슬릿형으로 형성된 투명한 화소전극을 포함하여 구성되는 프린지 필드 스위칭 액정표시장치에 있어서, 상기 다수개의 화소는 상기 공통전극과화소전극이 상기 하부기판 또는 절연막상에 배치된 구조의 화소와, 상기 공통전극과 화소전극 각각이 상기 하부기판 또는 절연막상에 상호 중첩되지 않게 배치된 구조의 화소로 이루어진 것을 특징으로 한다.In addition, a fringe field switching liquid crystal display device according to another aspect of the present invention for achieving the above object of the present invention comprises: upper and lower substrates disposed opposite each other with a liquid crystal layer interposed therebetween to constitute a plurality of pixels; A transparent common electrode formed in a slit shape for applying a common signal; A fringe field switching liquid crystal is formed between the common electrode and the insulating layer while being spaced apart, and forms a fringe field for driving the liquid crystal molecules in the liquid crystal layer together with the common electrode, and includes a transparent pixel electrode formed in a slit shape on the insulating layer. In the display device, the plurality of pixels may include pixels having a structure in which the common electrode and a pixel electrode are disposed on the lower substrate or the insulating layer, and the common electrode and the pixel electrode do not overlap each other on the lower substrate or the insulating layer. It is characterized by consisting of a pixel of the arrangement structure.
이하, 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 상세히 설명하도록 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 2 내지 5는 본 발명의 실시예에 따른 프린지 필드 스위칭 액정표시장치의 전극구조를 도시한 단면도이다.2 to 5 are cross-sectional views illustrating electrode structures of a fringe field switching liquid crystal display device according to an exemplary embodiment of the present invention.
본 발명에 따른 박막트랜지스터 액정표시장치는, 화소가 적어도 2 부분 이상으로 분할되어, 적어도 1부분은 상기 공통전극과 화소전극이 상기 하부전극 또는 절연막상에 배치되어 있고, 적어도 나머지 1부분은 상기 공통전극과 화소전극 각각이 상기 하부기판 또는 절연막상에 상하로 중첩되지 않게 배치되어 있다.In the thin film transistor liquid crystal display device according to the present invention, a pixel is divided into at least two parts, at least one part of which the common electrode and the pixel electrode are disposed on the lower electrode or the insulating film, and at least one other part of the common part. Electrodes and pixel electrodes are disposed so as not to overlap each other on the lower substrate or the insulating film.
본 발명의 실시예 1에 따른 프린지 필드 스위칭 액정표시장치는, 도 2에 도시된 바와 같이, 화소가 두 영역 A 및 B로 구분되어 있고, 각각의 영역에는 상호 상이한 전극구조로 되어 있다.In the fringe field switching liquid crystal display according to the first embodiment of the present invention, as shown in FIG. 2, pixels are divided into two regions A and B, and each region has an electrode structure different from each other.
구체적으로, 본 발명의 실시예 1의 A영역은, 하부기판(200)과 상부기판(214)이 소정 거리를 두고 대향 배치되어 있고, 상기 하부기판(200)과 상부기판(214) 사이에는 수개의 액정분자(미도시)를 포함하는 액정층(210)이 개재되어 있다.Specifically, in the region A according to the first embodiment of the present invention, the lower substrate 200 and the upper substrate 214 are disposed to face each other at a predetermined distance, and the lower substrate 200 and the upper substrate 214 are located between the lower substrate 200 and the upper substrate 214. The liquid crystal layer 210 including two liquid crystal molecules (not shown) is interposed.
또한, 상기 하부기판(200) 상에는 투명 전도체, 예를 들어, ITO로 된 공통전극(202)이 슬릿 형상으로, 소정 폭을 가지면서 일정 등간격으로 이격 배치되어 있다. 상기 공통전극(202)을 포함한 하부기판(200) 상부에는 절연막(204)이 형성되어있다. 상기 절연막(204)상의 공통전극(202) 사이의 부분에는 슬릿 형상을 가지며, ITO와 같은 투명 전도체로 된 화소전극(206)이 형성되어 있다. 여기서, 상기 화소전극(206)과 공통전극(202)간의 간격은 포물선 형태의 프린지 필드(fringe field)를 형성하기 위하여 셀 갭보다 작으며, 상기 공통전극(202)과 화소전극(206)의 폭은 화소전극(206)과 공통전극(202) 사이에 형성되는 전계가 각각의 전극(202)(206) 상부에도 미칠 수 있을 정도의 폭을 갖도록 형성되어 있다.In addition, on the lower substrate 200, a common conductor 202 made of a transparent conductor, for example, ITO, has a slit shape and is spaced at a predetermined equal interval while having a predetermined width. An insulating film 204 is formed on the lower substrate 200 including the common electrode 202. In the portion between the common electrode 202 on the insulating film 204, a pixel electrode 206 having a slit shape and made of a transparent conductor such as ITO is formed. Here, the distance between the pixel electrode 206 and the common electrode 202 is smaller than the cell gap to form a parabolic fringe field, and the width of the common electrode 202 and the pixel electrode 206 is smaller than the cell gap. The electric field formed between the pixel electrode 206 and the common electrode 202 is formed to have a width enough to extend over the respective electrodes 202 and 206.
여기서, 상기 공통전극(202)과 화소전극(206)간의 간격은 적어도 0보다 크게 하여, 즉 양 전극(202)(206)간에 형성되는 프린지 필드의 세기를 감소시키기 위한 일환으로 양 전극(202, 206)이 상하로 중첩되지 않도록 형성되게 한다.Here, the distance between the common electrode 202 and the pixel electrode 206 is greater than at least 0, that is, the positive electrode 202, as part of reducing the intensity of the fringe field formed between the positive electrode 202, 206. 206 is formed so that it does not overlap up and down.
또한, 본 발명의 실시예 1의 B영역은, 상기 공통전극(202) 및 화소전극(206)이 절연막(204)상에 형성되어 있다. 상기와 같이 동일 층, 즉 절연막(204)상에 공통전극과 화소전극이 형성된 구조는 전계가 절연막에 집중되지 않아서 잔상이 쉽게 발생되지 않는다.In the region B of the first embodiment of the present invention, the common electrode 202 and the pixel electrode 206 are formed on the insulating film 204. As described above, in the structure in which the common electrode and the pixel electrode are formed on the same layer, that is, the insulating film 204, the electric field is not concentrated on the insulating film, so that afterimages are not easily generated.
한편, 본 발명의 실시예 2는, 도 3에 도시된 바와 같이, 공통전극(202)과 화소전극(206)이 다른 층, 예를 들면, 하부기판(200) 및 절연막(204)상에 각각 형성된 구조(A영역)와, 실시예 1과 달리, 상기 공통전극(202)과 화소전극(206)이 동일 층, 즉 하부기판(200)상에 형성된 구조(B영역)로 구성되어 있다. 상기와 같은 구조도 전계가 절연막에 집중되지 않아서 잔상이 쉽게 발생되지 않는다.Meanwhile, in the second embodiment of the present invention, as shown in FIG. 3, the common electrode 202 and the pixel electrode 206 are respectively disposed on different layers, for example, the lower substrate 200 and the insulating film 204. Unlike the formed structure (region A) and the first embodiment, the common electrode 202 and the pixel electrode 206 have the same layer, that is, the structure (region B) formed on the lower substrate 200. Even in the above structure, since an electric field is not concentrated on the insulating film, afterimages are not easily generated.
본 발명의 실시예 3은 화소가 적어도 3부분 이상으로 분할되고, 각 분할된 영역에는 서로 다른 전극구조가 형성된 구조로 되어 있다.In Embodiment 3 of the present invention, a pixel is divided into at least three parts, and each divided area has a structure in which different electrode structures are formed.
이를 구체적으로 설명하면 다음과 같다. 본 발명의 실시예 3은, 도 4에 도시된 바와 같이, 공통전극(202)과 화소전극(206)이 서로 다른 층, 즉 하부전극(200)과 절연막(204)상에 형성된 구조(A영역)와, 상기 공통전극(202)과 화소전극(206)이 동일 층, 즉 절연막(204) 또는 하부기판(200)상에 형성된 구조(B 및 C영역)가 조합된 구조로 구성되어 있다.This will be described in detail as follows. In the third exemplary embodiment of the present invention, as shown in FIG. 4, the common electrode 202 and the pixel electrode 206 are formed on different layers, that is, the lower electrode 200 and the insulating film 204 (region A). ) And a structure in which the common electrode 202 and the pixel electrode 206 are formed on the same layer, that is, the structures (regions B and C) formed on the insulating film 204 or the lower substrate 200.
여기서, 상기 B 영역과 C 영역에 있어서, 각 전극(202)(206)이 위치하는 층은 각 영역간에 서로 다르다.Here, in the regions B and C, the layers where the electrodes 202 and 206 are located are different from each other.
한편, 본 발명의 실시예 4에 따른 프린지 필드 액정표시장치에 있어서 상기 공통전극(202)과 화소전극(206)은 화소의 특정 부분(A영역)에서는 그 위치가 상호 역전되게 형성된 구조로 되어 있다.On the other hand, in the fringe field liquid crystal display according to the fourth embodiment of the present invention, the common electrode 202 and the pixel electrode 206 have a structure in which their positions are reversed in a specific portion (region A) of the pixel. .
여기서, 도 5에 도시된 바와 같이, 하부기판(200)을 점선으로 좌우 양분하여 좌측영역을 A1영역이라 하고, 우측영역을 A2영역이라고 가정한다.As shown in FIG. 5, it is assumed that the lower substrate 200 is divided into left and right by dotted lines, and the left region is called the A1 region, and the right region is called the A2 region.
상기 A1영역은 하부기판(200)상에 공통전극(202)이 형성되어 있고, 화소전극(206)은 절연막(204)상에 형성되어 있는 구조로서, 전계소멸 직후의 잔류 DC 성분은 상기 공통전극(202; 양의 전극)으로부터 상기 화소전극(206; 음의 전극)쪽인 상향이다.The common electrode 202 is formed on the lower substrate 200 in the A1 region, and the pixel electrode 206 is formed on the insulating film 204. The residual DC component immediately after the electric field disappears is the common electrode. (202; positive electrode) is upward toward the pixel electrode 206 (negative electrode).
이에 반해, 상기 A2영역은 상기 A1영역과는 역으로 하부기판(200)상에 화소전극(206)이 형성되어 있고, 공통전극(202)은 절연막(204)상에 형성되어 있는 구조로서, 전계소멸 직후의 잔류 DC 성분은 하향이다.On the contrary, in the A2 region, the pixel electrode 206 is formed on the lower substrate 200 and the common electrode 202 is formed on the insulating film 204 in the opposite direction to the A1 region. The residual DC component immediately after extinction is downward.
상기한 바와 같이, 각 영역에서의 잔류 DC성분 방향이 상호 반대 방향이므로도 5의 점선 부근에서 잔류 DC성분은 상쇄되어 소멸되므로 잔상효과가 감소된다.As described above, since the residual DC component directions in the respective regions are opposite to each other, the residual DC component is canceled and disappeared near the dotted line in FIG.
도 2 내지 5에 도시된 본 발명의 다양한 실시예에 있어서, A영역상의 전극의 상하 위치를 역전시킬 수 있으며, A, B 및 C 영역의 조합을 다양하게 가져갈 수 있다. 특히, 한 화소내에 상기 A, B 및 C 영역이 조합된 구조가 잔상을 제거하는데 가장 적합하다. 또한, 상기 A영역이, 도 5에 도시된 바와 같이, A1 및 A2영역으로 전극이 상호 역전된 구조로 되어 있으면 잔상을 제거하는데 더 적합한 구조이다.In various embodiments of the present invention shown in Figures 2 to 5, it is possible to reverse the up and down position of the electrode on the A region, it is possible to take a combination of the A, B and C region in various ways. In particular, the structure in which the A, B, and C regions are combined in one pixel is most suitable for removing the afterimage. In addition, as shown in FIG. 5, the region A is more suitable for removing afterimages when the electrodes are inverted into regions A1 and A2.
지금까지는 한 화소를 기준으로 상이한 전극구조가 조합되는 실시예를 들었지만, 한 화소 전체를 특정한 전극구조로 형성하고 이러한 화소들을 인접하게 배치하여도 잔상을 제거하는 효과를 얻을 수 있다. 특히, 인접화소간 상기 A, B 및 C와 같은 전극구조가 조합된 구조가 잔상을 제거하는데 가장 적합한 화소배열이다.Up to now, the embodiment in which different electrode structures are combined with respect to one pixel has been described. However, even if the entire pixel is formed in a specific electrode structure and these pixels are arranged adjacently, the effect of removing the afterimage can be obtained. In particular, a structure in which electrode structures such as A, B, and C are combined between adjacent pixels is a pixel array most suitable for removing an afterimage.
본 명세서에 개시된 실시예는 본 발명에 따른 프린지 필드 액정표시장치를 설명하기 위한 것이지, 본 발명을 이에 한정하려는 의도는 아니다. 기타, 본 발명의 요지를 벗어나지 않는 범위에서 다양하게 변경하여 실시할 수 있다.The embodiments disclosed herein are intended to describe the fringe field liquid crystal display device according to the present invention, but are not intended to limit the present invention thereto. In addition, it can implement in various changes in the range which does not deviate from the summary of this invention.
이상에서 자세히 설명된 바와 같이, 본 발명에 따른 프린지 필드 스위칭 액정표시장치에 있어서는 다음과 같은 효과가 있다.As described in detail above, the fringe field switching liquid crystal display according to the present invention has the following effects.
본 발명에 있어서는 하부기판상의 공통전극 및 화소전극의 형상과 배치를 변경하되 공통전극과 화소전극이 화소의 일정부분에 있어서는 동일 층상에 배치하고, 화소의 다른 부분에 있어서는 서로 다른 층상에 배치함으로써 잔상을 감소시킬 수 있다.In the present invention, the shape and arrangement of the common electrode and the pixel electrode on the lower substrate are changed, but the common electrode and the pixel electrode are arranged on the same layer in a certain portion of the pixel, and in the other portion of the pixel, the afterimage is obtained by placing them on different layers. Can be reduced.
또한, 본 발명에 있어서는 공통전극과 화소전극의 위치를 역전되게 배치함으로써 잔류 직류성분이 상쇄되게 하고, 공통전극과 화소전극을 상하 중첩되지 않게 배치함으로써 전극간의 전계 세기를 종래보다 상당부분 약화시켜 잔상을 감소시킬 수 있다.In addition, in the present invention, the positions of the common electrode and the pixel electrode are reversed so that the residual DC component is canceled, and the common electrode and the pixel electrode are arranged so as not to overlap each other. Can be reduced.
따라서, 본 발명에 있어서는 잔상 특성이 종래 FFS 구조에 비해 1/4 수준이하로 감소되어 장시간 고정화면을 띄워도 잔상이 남지 않게 된다.Therefore, in the present invention, the afterimage property is reduced to less than 1/4 level compared to the conventional FFS structure, so that afterimages remain after a long time of holding a fixed screen.
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| KR101296648B1 (en) | 2007-05-15 | 2013-08-14 | 엘지디스플레이 주식회사 | Liquid Crystal Display Device |
| KR101323488B1 (en) | 2007-03-02 | 2013-10-31 | 엘지디스플레이 주식회사 | Liquid Crystal Display Panel and Manufacturing Method thereof |
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| KR101383785B1 (en) * | 2011-08-02 | 2014-04-11 | 부산대학교 산학협력단 | Horizontal switching mode liquid crystal display device |
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