KR100294680B1 - Structure of film compensating type liquid crystal display - Google Patents
Structure of film compensating type liquid crystal display Download PDFInfo
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- KR100294680B1 KR100294680B1 KR1019930010230A KR930010230A KR100294680B1 KR 100294680 B1 KR100294680 B1 KR 100294680B1 KR 1019930010230 A KR1019930010230 A KR 1019930010230A KR 930010230 A KR930010230 A KR 930010230A KR 100294680 B1 KR100294680 B1 KR 100294680B1
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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
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
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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
- G02F1/1396—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 the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
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Abstract
Description
제1도는 일반적인 네마틱-액정표시장치의 전압대 투과율 곡선.1 is a voltage versus transmittance curve of a typical nematic liquid crystal display.
제2(a)도는 노멀/블랙모드의 네마틱-액정표시장치의 인가전압에 대한 투과율 곡선.2 (a) is a transmittance curve with respect to an applied voltage of a nematic-liquid crystal display device in a normal / black mode.
제2(b)도는 노멀/화이트 모드의 네마틱-액정표시장치의 인가전압에 대한 투과율 곡선.2 (b) is a transmittance curve with respect to an applied voltage of a nematic-liquid crystal display device in a normal / white mode.
제3도는 본 발명의 위상차 필름 2장을 사용하여 파장 분산 특성을 보상하는 FLTN-LCD의 구성도.3 is a block diagram of an FLTN-LCD compensating wavelength dispersion characteristics using two retardation films of the present invention.
제4도는 본 발명의 60° 꼬인 FLTN-LCD의 투과 스펙트럼.4 is a transmission spectrum of a 60 ° twisted FLTN-LCD of the present invention.
제5(a)도는 본 발명의 액정이 60° 꼬인 FLTN-LCD와 종래의 TN-LCD의 전압에 대한 임계전압 부근에서의 투과율 곡선.5 (a) is a transmittance curve near the threshold voltage with respect to the voltage of the FLTN-LCD and the conventional TN-LCD in which the liquid crystal of the present invention is twisted by 60 °.
제5(b)도는 본 발명의 액정이 60° 꼬인 FLTN-LCD와 종래의 TN-LCD의 전압에 대한 전체 전압영역의 투과율 곡선.Figure 5 (b) is the transmittance curve of the entire voltage range with respect to the voltage of the FLTN-LCD twisted liquid crystal of the present invention 60 ° and conventional TN-LCD.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 편광자 2 : 위상차 필름1: polarizer 2: retardation film
3 : 액정셀3: liquid crystal cell
본 발명은 액정셀내의 분자들이 꼬인 상태로 비열되어 있는 액정표시장치에 관한 것으로, 액정분자의 꼬인각이 90° 미만인 LTN(Lower Twisted Nematic)액정표시장치에 위상차 필름을 부착시킨 필름 보상형 액정표시장치 구조에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device in which a molecule in a liquid crystal cell is twisted in a specific state, and has a film compensation type liquid crystal display in which a retardation film is attached to an LTN (Lower Twisted Nematic) liquid crystal display device having a twist angle of less than 90 ° Device structure.
LCD(Liquid Crystal Display)에서 TN(Twisted Nematic) 액정표시장치는 네마틱 액정의 액정분자들이 액정셀내에서 90° 꼬이도록 배향되고, 액정셀 양면에 편광자가 부착된 구조를 갖는다.TN (Twisted Nematic) liquid crystal displays in liquid crystal displays (LCDs) are aligned so that liquid crystal molecules of nematic liquid crystals are twisted by 90 ° in the liquid crystal cell, and polarizers are attached to both sides of the liquid crystal cell.
또한, TN-LCD와 유사한 구조를 가지며 액정셀의 액정분자들의 꼬인각도가 180° 이상인 액정표시장치를 STN(Super Twisted Nematic)-LCD라 하고 그 각도가 90° 이하인 LCD를 LTN(Lower Teisted Nematic)-LCD라 한다.In addition, a liquid crystal display device having a structure similar to a TN-LCD and having a twist angle of liquid crystal molecules of a liquid crystal cell of 180 ° or more is called STN (Super Twisted Nematic) -LCD, and an LCD having an angle of 90 ° or less is LTN (Lower Teisted Nematic). LCD is called.
그리고, TN-LCD에 전압을 인가하면 액정분자가 전계방향으로 일어서게 되는데 이와 같은 액정분자 배열의 변화에 따라 광의 투과율이 변하게 된다.When a voltage is applied to the TN-LCD, the liquid crystal molecules rise in the electric field direction, and the light transmittance changes according to the change in the arrangement of the liquid crystal molecules.
제1도는 종래의 기술을 설명하기 위한 TN-LCD의 인가전압에 따른 광의 투과율을 나타낸 것으로, 인가전압이 높아지면 투과율이 급격히 증가하다가 일정 전압 이상에서는 투과율이 거의 증가하지 않는다.FIG. 1 shows the light transmittance according to the applied voltage of the TN-LCD for explaining the conventional technology. As the applied voltage increases, the transmittance rapidly increases, but the transmittance hardly increases above a certain voltage.
그런데, 이 경우 인가 전압대 투과율의 기울기가 완만할수록 다계조(gradation : 화상에서의 명암 또는 농담의 상태를 소정의 농도로 구분한 것)를 표시하는데 유리하다.In this case, however, the gentler the slope of the applied voltage to transmittance, the more advantageous it is to display gradation (dividing the state of light and shade in an image by a predetermined density).
일반적으로 LTN-LCD는 TN-LCD에 비하여 전압대 투과율 곡선의 기울기가 더 완만하며, 따라서 다계조 표시에 있어 유리한 점이있다.In general, LTN-LCDs have a more gentle slope of the voltage-to-transmission curve than TN-LCDs, which is advantageous in multi-gradation display.
그리고, 능동 매트릭스 구동의 LCD에서 총천연색(Full Color)을 구현하기 위해서 가장 쉬운 방법은 전압대 투과율 곡선의 기울기를 완만하게 하는데 이때에도 LTN-LCD가 TN-LCD보다 적합하다.In addition, the easiest way to achieve full color in an active matrix driven LCD is to smooth the slope of the voltage-to-transmittance curve. LTN-LCDs are more suitable than TN-LCDs.
제2(a)도, 제2(b)도는 TN-LCD에서 노멀/블랙모드와 노멀/화이트 모드시 인가전압에 따른 투과율 곡선을 나타낸 것으로, LCD의 두편광자의 투과축 방향이 서로 평행일 때 노멀블랙(N/B)모드가 되고, 두편광자의 투과축의 방향이 서로 수직일 때 노멀화이트(N/W)모드가 된다.2 (a) and 2 (b) show the transmittance curves according to the applied voltages in the normal / black mode and the normal / white mode in the TN-LCD, when the transmission axis directions of the two polarizers of the LCD are parallel to each other. In the normal black (N / B) mode, when the transmission axes of the two polarizers are perpendicular to each other, the normal white (N / W) mode is entered.
제2(a)도의 N/B모드에서 암(dark)표시시 완전한 암표시가 안되는 이유는 파장분산 특성 때문이다.The reason why full dark display is not performed in the dark display in the N / B mode of FIG. 2 (a) is due to the wavelength dispersion characteristic.
즉, 전압 비 인가시 액정셀에 입사되는 직선편광이 액정셀을 통과할 때 그 편광방향이 90° 회전하는 선광효과가 특정한 단일 파장의 빛에 대해서만 완벽하게 나타나며, 그 파장과 다른 파장의 빛은 정확히 90° 선광되지 않는 파장분산 특성이 나타난다.In other words, when a linear polarized light incident on the liquid crystal cell passes through the liquid crystal cell when no voltage is applied, the optical beneficiation effect of rotating the polarization direction by 90 ° is perfect for only a single wavelength of light. Wavelength dispersion characteristics are exhibited that are not exactly 90 ° beneficiation.
그리고, N/W(Normal/white)모드에서는 이 파장 분산 특성으로 인해 전압비 인가시(명(bright)표시시) 밝기가 약간 떨어진다.In the N / W (Normal / white) mode, the brightness is slightly decreased when the voltage ratio is applied (bright display) due to the wavelength dispersion characteristic.
파장 분산 특성에 의한 콘트라스트(Contrast) 비의 저하는 N/W 모드에 비해 N/B 모드에서 현저하게 나타난다.The decrease in the contrast ratio due to the wavelength dispersion characteristic is remarkable in the N / B mode compared to the N / W mode.
그 이유는 콘트라스트 비에 절대적인 영향을 미치는 요인은 암 표시 상태가 얼마나 어두운가에 달려있기 때문이다.The reason for the absolute influence on the contrast ratio depends on how dark the cancer display state is.
그러나, 이와는 달리 능동 매트릭스 LCD의 밝기면에서는 N/W 모드가 N/B 모드 보다 더 밝다.However, in contrast, the N / W mode is brighter than the N / B mode in terms of the brightness of the active matrix LCD.
그 이유는 N/W 모드와는 달리 N/B 모드에서는 블랙 마스크(Black Mask)가 원리적으로 필요하지 않아 개구율이 상대적으로 높기 때문이다.This is because, unlike the N / W mode, a black mask is not required in principle in the N / B mode, so the aperture ratio is relatively high.
그리고, TN-LCD에서 N/B 모드시 광투과율은 제2(a)도에서와 같이 인가전압의 증가에 따라 처음 낮은 전압상태에서는 투과율이 일정하다가 일정 전압 이상에서는 광투과율이 급격하게 직선적으로 증가하다가 일정 전압 이상이 되면 광투과율은 일정한 값을 나타낸다.In the N / B mode of the TN-LCD, the transmittance is constant at the first low voltage state as the applied voltage increases, as shown in FIG. 2 (a), but the light transmittance rapidly increases linearly above a certain voltage. When the voltage is higher than a certain voltage, the light transmittance is constant.
반면 TN-LCD에서 N/W 모드시는 제2(b)도에서와 같이 투과율이 전압 비인가시 최대치를 나타내며, 인가전압의 증가에 따라 어느 한도까지는 일정한 광투과율을 나타내다가 급격하게 직선적으로 감소하여 일정 전압 이상에서는 광투과율이 제로(Zero)가 된다.On the other hand, in the N / W mode in TN-LCD, the transmittance shows the maximum value when no voltage is applied, as shown in FIG. 2 (b). Above a certain voltage, the light transmittance becomes zero.
이와같은 종래의 기술에서 LTN-LCD는 TN-LCD에 비하여 계조 표시가 용이하나 파장 분산 특성은 TN-LCD에 비하여 보다 높기 때문에 콘트라스트가 더 낫다.In this conventional technique, LTN-LCDs are easier to display gradations than TN-LCDs, but the contrast is better because the wavelength dispersion characteristic is higher than that of TN-LCDs.
따라서, LTN-LCD를 이용하여 다계조 표시를 구현하기 위해서는 파장 분산특성을 줄여야 한다.Therefore, in order to implement multi-gradation display using LTN-LCD, wavelength dispersion characteristics should be reduced.
본 발명은 상기한 종래 기술의 문제점을 해결하기 위해 안출된 것으로, LTN-LCD에 위상차 필름을 부가하여 파장 분산 특성에 의한 콘트라스트 비의 저하를 방지하는데 그 목적이 있다.The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to prevent a decrease in contrast ratio due to wavelength dispersion characteristics by adding a retardation film to the LTN-LCD.
이하에서 본 발명의 목적을 실현하기 위한 실시예를 첨부된 도면을 참조하여 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings an embodiment for realizing the object of the present invention will be described.
제3(a)도-제3(c)도는 본 발명을 설명하기 위한 FLTN-LCD의 개략적인 구성을 나타낸 것으로, FLTN-LCD의 구조는 제3(a)도와 같이 LCD의 상부 판넬의 편광자(1)하부에 위상차 필름(2)을 형성하고, 액정셀(액정분자의 꼬임각이 0° ~ 90° )(3)하부에 위상차 필름(2)을 형성하고, 그 하부에 편광자(1)를 형성시킨 구조와 제3(b)도와 같이 상층으로부터 편광자(1), 액정셀(3), 위상차 필름(2), 위상차 필름(2), 편광자(1)의 순서로 형성된 구조와, 제3(c)도와 같이 상층으로부터, 편광자(1), 위상차 필름(2), 위상차 필름(2), 액정셀(3), 편광자(1)의 순서로 형성시킨 3가지 구조로 제작될 수 있다.FIG. 3 (a)-FIG. 3 (c) show the schematic structure of the FLTN-LCD for explaining the present invention. The structure of the FLTN-LCD is a polarizer of the upper panel of the LCD as shown in FIG. 1) The retardation film 2 is formed on the lower part, the retardation film 2 is formed on the lower part of the liquid crystal cell (the angle of twist of the liquid crystal molecules is 0 ° to 90 °), and the polarizer 1 is disposed on the lower part thereof. The structure formed and the structure formed in the order of the polarizer 1, the liquid crystal cell 3, the retardation film 2, the retardation film 2, and the polarizer 1 from the upper layer like FIG. 3 (b), and the 3 ( As shown in c), the polarizer 1, the retardation film 2, the retardation film 2, the liquid crystal cell 3, and the polarizer 1 may be manufactured in three structures.
제3도에서 위상차 필름(2)은 액정셀(3)을 통과한 빛의 편광상태를 각 파장별로 적절하게 변환시킴으로써 파장 분산 특성을 보상하는 역할을 한다.In FIG. 3, the retardation film 2 serves to compensate wavelength dispersion characteristics by appropriately converting polarization states of light passing through the liquid crystal cell 3 for each wavelength.
본 발명에 의하여 제작된 필름 보상형 LTN-LCD(이하 FLTN-LCD라 한다)에서는 위상 지연치가 100~1000nm인 위상차 필름(폴리카보네이트 내지 폴리비닐알코올)(2)을 2장 사용하는 것이 특성과 가격측면에서 유리하지만, 필요에 따라서는 1장 또는 3장 이상의 필름을 사용할 수도 있다.In the film-compensated LTN-LCD (hereinafter referred to as FLTN-LCD) produced by the present invention, the use of two retardation films (polycarbonate to polyvinyl alcohol) 2 having a phase retardation of 100 to 1000 nm is characteristic and price. Although advantageous in terms of aspect, one or three or more films may be used if necessary.
그리고 제3(a)도-제3(c)도와 같이 각기 다른 구성을 갖는 FLTN-LCD는 광학적 측면에서 특성이 약간 다를 수는 있으나 파장 분산 특성을 보상하는 점에서는 유사하다.In addition, FLTN-LCDs having different configurations as shown in FIGS. 3 (a) and 3 (c) may have slightly different optical characteristics, but are similar in terms of compensating wavelength dispersion characteristics.
또한 FLTN-LCD는 기존의 TN-LCD 및 LTN-LCD와 액정셀의 구조와 편광자 사용면에서는 유사하지만 위상차 필름을 사용하여 파장 분산 특성을 보상하는 기능과 설계 조건에서는 다르다.In addition, FLTN-LCD is similar in structure and polarizer use of conventional TN-LCD and LTN-LCD and liquid crystal cell, but differs in function and design condition to compensate wavelength dispersion characteristics using retardation film.
FLTN-LCD에서 대표적인 설계 변수는 두 편광자의 투과축 방향, 보상용 필름의 광축방향과 위상지연값, 액정셀의 Δnd(Δn : 굴절율 이방성 d : 셀 두께)와 트위스트각 등으로 제품에서 요구되는 여러 가지 전기광학 특성(계조표시, 콘트라스트, 밝기, 배경색, 시야각등)을 만족하도록 한다.Representative design parameters of FLTN-LCD include various polarizations of two polarizers, optical axis direction and phase delay value of compensation film, Δnd (Δn: refractive anisotropy d: cell thickness) and twist angle of liquid crystal cell. It meets all kinds of electro-optical characteristics (gradation display, contrast, brightness, background color, viewing angle, etc.).
제4도는 본 발명에서 액정분자들이 60° 꼬인 FLTN-LCD(Δnd=400nm)와 종래의 TN-LCD의 전압인가시 및 전압 비 인가시의 스펙트럼을 나타낸 것으로 이 그래프에서 나타난 바와같이 암(dark)표시시(전압 비 인가시) FLTN-LCD(곡선 c)가 TN-LCD(곡선 a)보다 파장 분산 특성이 현저히 낮음을 보인다.4 shows the spectrum of the liquid crystal molecules twisted at 60 ° FLTN-LCD (Δnd = 400nm) and the conventional TN-LCD when voltage is applied and voltage is not applied, as shown in this graph. At display (no voltage applied), the FLTN-LCD (curve c) shows significantly lower wavelength dispersion characteristics than the TN-LCD (curve a).
즉, 위상차 필름에 대한 보상으로 파장 분산에 의한 전압 비 인가시 빛의 누설을 현저히 줄일 수 있다.That is, the leakage of light can be significantly reduced when the voltage ratio is not applied due to wavelength dispersion as compensation for the retardation film.
제5(a)도, 제5(b)도는 본 발명에서 액정분자가 60° 꼬인 FLTN-LCD와 종래의 TN-LCD의 전압에 대한 임계전압부근과 전체 전압영역에서의 투과율 곡선을 나타낸 것으로, 여기서 FLTN-LCD의 액정셀의 Δnd는 300(곡선 b), 400(곡선 c), 500nm(곡선 d)이고 TN-LCD의 액정셀(곡선 a)의 Δnd는 476nm이다.5 (a) and 5 (b) show the transmittance curves near the threshold voltage and the entire voltage range with respect to the voltages of the FLTN-LCD and the conventional TN-LCD whose liquid crystal molecules are twisted by 60 ° in the present invention. Here, Δnd of the liquid crystal cell of the FLTN-LCD is 300 (curve b), 400 (curve c) and 500 nm (curve d), and Δnd of the liquid crystal cell of the TN-LCD (curve a) is 476 nm.
먼저 제5(a)도의 임계전압 부근에서의 FLTN-LCD의 암표시시의 빛의 누설을 나타낸 곡선(b)-(d)는 TN-LCD의 곡선 (a)와 비교하여 보면 약 ½로 누설되는 빛의 양이 감소함을 알 수 있다.First, curves (b) to (d) showing the light leakage in the dark display of the FLTN-LCD near the threshold voltage of FIG. 5 (a) are about ½ as compared to the curve (a) of the TN-LCD. It can be seen that the amount of light is reduced.
따라서, 이때 FLTN-LCD의 콘트라스트 비는 TN-LCD의 경우보다 약 2배 증가한다.Thus, the contrast ratio of the FLTN-LCD is increased by about two times than that of the TN-LCD.
그리고 제5(b)도 전체 전압 영역을 나타낸 그래프에서는 액정셀의 Δnd가 300nm, 400nm(곡선 b, c)인 FLTN-LCD의 경우(곡선 a)보다 곡선이 완만하기 때문에 다계조 표시가 용이하며, 액정의 Δnd가 500nm인(곡선 d) FLTN-LCD는 TN-LCD 보다 구동전압이 더 낮다는 장점을 보인다.In addition, in the graph showing the entire voltage range, the multi-gradation display is easier because the curve is gentler than that of the FLTN-LCD having Δnd of 300 nm and 400 nm (curves b and c) (curve a). In addition, the FLTN-LCD having a liquid crystal Δnd of 500 nm (curve d) has a lower driving voltage than the TN-LCD.
따라서 FLTN-LCD에서 액정셀의 Δnd를 조정함으로써 계조표시능력을 향상시키거나 구동전압을 감소시킬 수 있다.Therefore, by adjusting the Δnd of the liquid crystal cell in the FLTN-LCD, the gray scale display capability can be improved or the driving voltage can be reduced.
이와같은 본 발명에 의한 FLTN-LCD는 종래의 TN-LCD에 비하여 다조계 표시에 유리하고, 높은 콘트라스트와 밝기를 동시에 실현할 수 있으며, 필요에 따라 낮은 전압으로 구동시킬 수 있는 효과가 있다.Such FLTN-LCD according to the present invention is advantageous to multi-tone display, and can realize high contrast and brightness at the same time, compared to the conventional TN-LCD, there is an effect that can be driven at a low voltage as needed.
따라서 본 발명은 고화질 풀 칼라(Full Color) 박막트랜지스터 액정표시장치 개발에 효과적으로 적용할 수 있다.Therefore, the present invention can be effectively applied to the development of a high quality full color thin film transistor liquid crystal display device.
Claims (7)
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