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KR100265248B1 - Reflective lcd device - Google Patents

Reflective lcd device Download PDF

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Publication number
KR100265248B1
KR100265248B1 KR1019970040895A KR19970040895A KR100265248B1 KR 100265248 B1 KR100265248 B1 KR 100265248B1 KR 1019970040895 A KR1019970040895 A KR 1019970040895A KR 19970040895 A KR19970040895 A KR 19970040895A KR 100265248 B1 KR100265248 B1 KR 100265248B1
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South Korea
Prior art keywords
liquid crystal
light
crystal display
display device
color
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KR1019970040895A
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Korean (ko)
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KR19990017835A (en
Inventor
한관영
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김순택
삼성에스디아이주식회사
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Priority to KR1019970040895A priority Critical patent/KR100265248B1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers
    • 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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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE: A reflective liquid crystal display is to secure high contrast and to improving a reflective rate by a high molecular layer as a color embodying member. CONSTITUTION: The liquid crystal display comprises upper and lower substrates(3a,3b) with a liquid crystal(9) interposed between conductive films(5), a color embodying member, and a reflective plate(13) for reflecting an incident ray. Molecular of the liquid crystal is oriented in a state of slanted angle relative to a surface of the substrate. The upper and lower substrates are made of a transparent glass or plastic. The conductive film includes a common electrode provided on the upper substrate and a pixel electrode provided on a lower substrate, so that the conductive film is applied with a voltage to orient the liquid crystal to a desired direction. The color embodying member consists of a cholesteric high molecular layer(11), and the cholesteric high molecular layer is disposed on an incident surface of the reflective plate.

Description

반사형 액정표시장치Reflective LCD

본 발명은 반사형 액정표시장치에 관한 것으로서, 보다 상세하게는 저조한 반사율로 인해 컨트라스트가 저하되는 것을 개선한 고반사율 반사형 액정표시장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflective liquid crystal display device, and more particularly, to a high reflectivity reflective liquid crystal display device in which contrast is reduced due to low reflectance.

일반적으로 액정표시장치(LCD)는 투명전극 사이에 있는 액정에 일정한 전기장을 인가하여 빛의 투과 특성을 변화시켜 명암을 나타내는 장치로서, 조명방식에 따라 투과형과 반사형으로 대별된다.In general, a liquid crystal display (LCD) is a device that displays a contrast by applying a constant electric field to the liquid crystal between the transparent electrodes to change the transmission characteristics of light, and is classified into a transmission type and a reflection type according to an illumination method.

위에 언급된 반사형 액정표시장치는 내부에 인위적인 광원을 구비한 투과형 과는 달리 반사판을 이용하여 외부의 광원, 즉 자연광 또는 백열등으로부터 입사한 빛을 반사하여 사용자에게 원하는 화상을 제공하는 장치이다.The above-mentioned reflective liquid crystal display device is a device that provides a desired image to a user by reflecting light incident from an external light source, that is, natural light or incandescent lamp, using a reflective plate, unlike a transmission type having an artificial light source therein.

그러나 이 반사형 액정표시장치는 액정물질을 사이에 두고 배치되는 편광판(Polarizer Film)이 상당량의 빛을 차단하여 반사율을 저조케 하는 관계로 컨트라스트가 떨어지는 단점이 있다.However, this reflective liquid crystal display device has a disadvantage in that contrast is lowered because a polarizer film disposed with a liquid crystal material interposed therebetween blocks a considerable amount of light to lower reflectance.

이를 해결하기 위하여, 지속적인 연구가 계속되는 가운데, 이 연구의 결과로서, 2개의 편광판을 1개로 줄여 반사율을 향상시킨 반사형 액정표시장치가 제안되고 있다.In order to solve this problem, continuous research has been continued, and as a result of this research, a reflective liquid crystal display device having improved reflectance by reducing two polarizing plates to one has been proposed.

그러나 위에 기재한 1개의 편광판을 채용하여 반사율을 향상시킨 종래의 반사형 액정표시장치는 컬러화상을 구현하기 위한 컬러필터(Color Filter)가 편광판을 통해 입사한 빛을 흡수하고 또한 반사판에 의해 반사된 빛의 상당량을 다시 한 번 흡수하게 되어 높은 반사율을 얻기에는 부족한 감이 있다.However, in the conventional reflective liquid crystal display device employing one polarizing plate described above to improve reflectance, a color filter for realizing a color image absorbs light incident through the polarizing plate and is reflected by the reflecting plate. The absorption of a large amount of light once again is not enough to achieve a high reflectance.

이에 따라 컨트라스트가 불량하게 됨은 물론 실질적으로 사용자의 눈에 들어오는 광의 량이 미흡해 보는 사람의 눈을 피로하게 한다.As a result, the contrast is not only poor, but the amount of light entering the user's eyes is substantially insufficient, and the viewer's eyes are tired.

따라서 본 발명은 종래의 반사형 액정표시장치가 해결하지 못한 기술적 과제를 해소하기 위해 발명된 것으로서, 본 발명의 목적은 반사율을 향상시켜 높은 컨트라스트를 확보함은 물론 컬러 실현도를 개선하여 고반사율의 컬러화가 가능한 반사형 액정표시장치를 제공하는데 있다.Therefore, the present invention was invented to solve the technical problem that the conventional reflective liquid crystal display device has not solved. The object of the present invention is to improve the reflectivity by improving the reflectance and to improve the color realization to improve the high reflectance. The present invention provides a reflective liquid crystal display device capable of colorization.

위에 기재한 목적을 실현하기 위하여 본 발명에 따른 반사형 액정표시장치는 액정을 사이에 두고 배치되는 상, 하 기판과; 위에 기재한 상, 하 기판의 액정방향 일측면에 제공된 도전막과; 이 도전막의 액정방향에 제공된 배향막과; 위에 기재한 상 기판의 타측면에 제공된 편광막과; 위에 기재한 하 기판과 전도막사이에 제공된 반사판과; 이 반사판의 광의 입사면에 제공되고, 입사광을 적, 녹, 청 3색의 반사광으로 전환시키는 제공하는 컬러구현수단을 포함한다.Reflective liquid crystal display device according to the present invention for realizing the above object and the upper and lower substrates disposed with the liquid crystal interposed therebetween; A conductive film provided on one side of the upper and lower substrates in the liquid crystal direction; An alignment film provided in the liquid crystal direction of the conductive film; A polarizing film provided on the other side of the upper substrate described above; A reflector provided between the lower substrate and the conductive film described above; And a color implementation means provided on the incident surface of the light of the reflecting plate and converting the incident light into reflected light of three colors of red, green, and blue.

위에 기재한 컬러구현수단은 입사광을 적, 녹, 청 3색의 가시광으로 전환시킬 수 있는 피치를 갖는 콜레스테릭 고분자층을 포함한다.The color implementation means described above includes a cholesteric polymer layer having a pitch capable of converting incident light into visible light of three colors of red, green, and blue.

도 1은 본 발명에 의해 새롭게 구현되는 반사형 액정표시장치의 측단면도.1 is a side cross-sectional view of a reflective liquid crystal display device newly implemented by the present invention.

도 2는 본 발명에 따른 반사형 액정표시장치에서 밝은 반사광의 구현 범위를 설명하기 위한 측단면도.Figure 2 is a side cross-sectional view for explaining the implementation range of the bright reflected light in the reflective liquid crystal display device according to the present invention.

도 3은 본 발명에 따른 반사형 액정표시장치의 반사판의 구조를 설명하기 위한 측단면도.Figure 3 is a side cross-sectional view for explaining the structure of the reflecting plate of the reflective liquid crystal display device according to the present invention.

도 4는 본 발명에 따른 반사형 액정표시장치의 반사율과 시야각과의 관계를 설명하기 위한 그래프.4 is a graph for explaining the relationship between the reflectance and the viewing angle of the reflective liquid crystal display according to the present invention;

이하 본 발명의 가장 바람직한 실시예를 첨부한 도면을 참조하여 보다 상세하게 설명한다.DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

먼저 도 1은 본 발명에 의해 새롭게 구현되는 반사형 액정표시장치의 측단면도이고, 도 2는 본 발명에 따른 반사형 액정표시장치에서 밝은 반사광의 구현범위를 설명하기 위한 측단면도이고, 도 3은 본 발명에 따른 반사형 액정표시장치의 반사판의 구조를 설명하기 위한 측단면도이며, 도 4는 본 발명에 따른 반사형 액정표시장치의 반사율과 시야각과의 관계를 설명하기 위한 그래프이다.First, FIG. 1 is a side cross-sectional view of a reflective liquid crystal display device newly implemented by the present invention, FIG. 2 is a side cross-sectional view for explaining an implementation range of bright reflected light in the reflective liquid crystal display device according to the present invention, and FIG. 4 is a side cross-sectional view illustrating the structure of a reflecting plate of the reflective liquid crystal display device according to the present invention, and FIG. 4 is a graph for explaining the relationship between the reflectance and the viewing angle of the reflective liquid crystal display device according to the present invention.

본 발명에 의해 새롭게 구현되는 반사형 액정표시장치(G)는 도 1에 나타낸 바와 같이 액정(9)을 사이에 두고 각각 도전막(5)을 갖는 상, 하 기판(3a)(3b)과, 컬러화상을 구현하는 컬러구현수단과, 입사광을 반사시키는 반사판(13)을 포함하며, 위에 언급된 액정(9)은 유전이방성형인 티엔(Twisted Nemetic), 또는 에스티엔(Super twisted Nematic)모드(Mode)로 제공되고, 액정분자는 장축방향이 상, 하 기판(3a)(3b)면에 수직으로 배향된 수직배향이나 장축방향이 기판면에 일정 각도만큼 기울어진 경사배향된다.The reflective liquid crystal display device G newly implemented by the present invention includes upper and lower substrates 3a and 3b each having a conductive film 5 interposed therebetween as shown in FIG. It includes a color implementation means for implementing a color image, and a reflecting plate 13 for reflecting the incident light, wherein the liquid crystal 9 mentioned above is a dielectric anisotropic twisted nemetic, or super twisted nematic mode ( Mode), and the liquid crystal molecules are vertically aligned in a long axis direction orthogonal to the upper and lower substrates 3a and 3b or inclined inclined by a predetermined angle to the substrate surface.

위에 기재한 상, 하 기판(3a)(3b))은 액정(9)을 보존하기 위하여 제공되는 것으로 사용자의 시선이 닿는 상 기판(3a)과, 이 상 기판(3a)과 함께 액정(9)을 보존하는 하 기판(3b)으로 구성되며, 보통 광투과성이 우수한 투명유리로 형성되는 것이 일반적이나, 안전성을 고려하여 투명한 플라스틱으로 형성되기도 한다.The upper and lower substrates 3a and 3b described above are provided to preserve the liquid crystal 9, and the liquid crystal 9 together with the upper substrate 3a to which the user's eyes touch and the upper substrate 3a. It is composed of a lower substrate (3b) for preserving the, usually formed of a transparent glass excellent in light transmittance, but is also formed of a transparent plastic in consideration of safety.

이 상,하 기판(3a)(3b)에 제공되는 도전막(5)은 전압을 인가받아 액정을 원하는 상태로 배향시키기 위하여 제공되는 것으로, 상 기판(3a)에 제공되는 공통전극과 하 기판(3b)에 제공되는 화소전극으로 구성된다.The conductive film 5 provided on the upper and lower substrates 3a and 3b is provided to orient the liquid crystal in a desired state by applying a voltage. The common electrode and the lower substrate provided on the upper substrate 3a It consists of the pixel electrode provided to 3b).

상기한 공통전극과 화소전극은 통상의 구조를 따르므로 그 자세한 설명은 생략하기로 한다.Since the common electrode and the pixel electrode have a conventional structure, detailed description thereof will be omitted.

한편 위에 기재한 컬러구현수단은 위에 기재한 반사판(13)에 의해 반사된 광을 적, 녹, 청 3색의 가시광으로 전환시키기 위하여 제공되는 것이다.On the other hand, the color implementation means described above is provided to convert the light reflected by the reflector 13 described above into visible light of three colors of red, green and blue.

위에 기재한 액정(9)을 보존하기 위한 상, 하 기판(3a)(3b)은 투명유리로 형성된 바, 액정(9)의 배향방향에 관계없이 광원으로부터 입사된 빛 모두를 그대로 투과시키므로, 화상의 구현은 이루어지지 않는다.Since the upper and lower substrates 3a and 3b for preserving the liquid crystal 9 described above are formed of transparent glass, all of the light incident from the light source is transmitted as it is regardless of the alignment direction of the liquid crystal 9, so that the image The implementation of is not done.

따라서 광원으로부터 입사되는 광을 액정(9)의 배향방향을 고려하여 편광시켜 투과시키거나 차단시키기 위해 상 기판(3a)의 도전막(5) 반대방향 일측면으로 편광막(1)이 제공된다.Accordingly, in order to polarize and transmit or block light incident from the light source in consideration of the alignment direction of the liquid crystal 9, the polarizing film 1 is provided on one side opposite to the conductive film 5 of the upper substrate 3a.

또한 위에 기재한 상, 하 기판(3a)(3b)의 도전막(5)의 액정방향으로 배향막(7)이 제공되는데, 이 배향막(7)은 러빙 등의 처리를 받아 도전막(5)에 전기장이 인가되지 않아도 액정(9)이 소정의 상태로 일정하게 배향하고 있도록 한다.In addition, an alignment film 7 is provided in the liquid crystal direction of the conductive film 5 of the upper and lower substrates 3a and 3b described above. The alignment film 7 is subjected to treatment such as rubbing to the conductive film 5. Even if an electric field is not applied, the liquid crystal 9 is constantly oriented in a predetermined state.

한편 위에 기재한 반사판(13)에 의해 반사된 광을 적, 녹, 청 3색의 가시광으로 전환시키기 위한 컬러구현수단으로 본 실시예에서는 고분자와 콜레스테릭 액정으로 이루어진 콜레스테릭 고분자층(11)이 적용되며, 이 콜레스테릭 고분자층(11)은 반사판(13)의 광의 입사면에 제공된다.．On the other hand, as a color implementation means for converting the light reflected by the reflector 13 described above into visible light of red, green and blue colors, in this embodiment, the cholesteric polymer layer 11 made of a polymer and a cholesteric liquid crystal. ) Is applied, and the cholesteric polymer layer 11 is provided on the incident surface of the light of the reflecting plate 13.

이 콜레스테릭 고분자층(11)은 반사판(13)에 반사된 광의 파장을 비틀린 콜레스테릭 액정의 피치(Pitch)에 따라 컬러별 반사광, 즉 적, 녹, 청 3색의 가시광으로 전환시키며, 이렇게 전환된 반사광은 색상의 흡수없이 액정(9)을 통과하여 사용자의 눈에 인식된다.The cholesteric polymer layer 11 converts the wavelength of the light reflected by the reflector 13 into visible light of three colors, that is, red, green, and blue, depending on the pitch of the twisted cholesteric liquid crystal. The converted reflected light passes through the liquid crystal 9 without being absorbed in color and is recognized by the user's eyes.

더욱 상세하게 설명하면 다음과 같다.More detailed description is as follows.

이 콜레스테릭 고분자는 헤리칼 방향과 동일 방향을 갖는 편광이 선택적으로 파장에 해당하는 빛을 산란 반사하게 된다.In the cholesteric polymer, polarized light having the same direction as the helical direction selectively reflects and reflects light corresponding to the wavelength.

즉, 최대의 선택광산란(λ)은 다음의 수학식 1로 표현된다.That is, the maximum selective light scattering? Is expressed by the following equation.

Figure 1019970040895_B1_M0001
Figure 1019970040895_B1_M0001

위의 수학식 1에서 P는 헤리칼 피치(Picth)이고,

Figure 1019970040895_B1_M0003
은 헤리칼 축에 직교하는 평면내의 평균 굴절율로서 다음의 수학식 2로 표현된다.In Equation 1 above, P is a helical pitch,
Figure 1019970040895_B1_M0003
 Is the average refractive index in the plane orthogonal to the helical axis, and is represented by the following expression (2).

Figure 1019970040895_B1_M0002
Figure 1019970040895_B1_M0002

여기서 n11 은 콜레스테릭 고분자 액정의 평행 굴절율이고, n12 은 콜레스테릭 고분자 액정의 수직성분의 굴절율이다.here n 11 Is the parallel refractive index of the cholesteric polymer liquid crystal, n 12 Is the refractive index of the vertical component of the cholesteric polymer liquid crystal.

이때의 반사광의 파장밴드폭( Δλ )는 다음의 수학식 3과 4로 표현된다.The wavelength band width of the reflected light at this time ( Δλ ) Is expressed by the following equations (3) and (4).

Δλ=Δn⋅pΔλ = Δn⋅p

Δn=n11-n12 Δn = n 11 -n 12

따라서 콜레스테릭 고준바 액정층의 피치를 조절하여 박막화하면 원하는 적, 녹, 청의 구현이 가능케 된다.Therefore, if the thin film is adjusted by adjusting the pitch of the cholesteric high-compliance liquid crystal layer, the desired red, green, and blue colors can be realized.

또한 입사광 및 반사광의 상당량을 흡수하는 종래 컬러필터(도시생략)가 적용되지 않고 위에 기재한 콜레스테릭 고분자층(11)이 제공되므로 반사율은 향상되고, 높은 콘트라스트를 얻을 수 있다.In addition, since the cholesteric polymer layer 11 described above is provided without the conventional color filter (not shown) absorbing a considerable amount of incident light and reflected light, the reflectance is improved, and high contrast can be obtained.

보다 상세하게는 기존의 컬러 필터는 광의 흡수도가 높은 감법혼색에 의해 투과광이 낮은 것이 단점이며, 더욱이 입사광, 반사광을 2번 광흡수로 하게 되어 반사율이 낮은 것이 단점이었으나, 본 발명의 콜레스테릭 고분자층이 반사막 위에 적층되어 박막화되므로, 반사광의 흡수는 거의 없고, 더욱이 가법혼색의 원리를 활용하므로 반사율은 더 높이 증가시켜 50%이상 실현 가능하다.More specifically, the conventional color filter has a disadvantage in that the transmitted light is low due to subtractive mixed color with high absorption of light, and in addition, the incident light and reflected light are absorbed twice so that the reflectance is low. Since the polymer layer is laminated on the reflective film and thinned, the absorption of the reflected light is almost absent. Furthermore, since the principle of additive color mixing is used, the reflectance can be further increased to realize more than 50%.

또한 비선형 구조의 반사판과 일체가 되므로 고반사율, 고컨트라스트가 가능한 반사형 액정표시장치의 실현이 가능하게 된다.In addition, since it is integrated with the reflector of the nonlinear structure, the reflection type liquid crystal display device capable of high reflectance and high contrast can be realized.

한편 위에 언급된 반사판(13)의 광의 입사면, 즉 콜레스테릭 고분자층(11)과 접하는 면은 도 2~4에 도시한 바와 같이 ±40°이내의 일정 시야각(ψ)에서 광을 더욱더 확대하여 밝은 반사광을 제공하기 위해, 비선형적인 구조로 형성된다.On the other hand, the incident surface of the light of the reflector 13 mentioned above, that is, the surface in contact with the cholesteric polymer layer 11, further enlarges the light at a certain viewing angle (ψ) within ± 40 ° as shown in FIGS. In order to provide bright reflected light, it is formed into a nonlinear structure.

즉, 이처럼 비선형 구조의 입사면을 갖는 반사판(13)은 도 4에 반사율(R)과 반사각도의 관계를 그래프로 도시한 바와 같이 입사되는 광을 ±40°이내로 모아서 반사시킨다.That is, the reflecting plate 13 having the non-linear incidence surface collects and reflects the incident light within ± 40 ° as shown in a graph of the relationship between the reflectance R and the reflection angle in FIG. 4.

상기에서는 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것이 아니고 특허청구의 범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시하는 것이 가능하고 이 또한 본 발명의 범위에 속하는 것은 당연하다.Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

위와 같이 본 발명에 의하여 새롭게 구현되는 반사형 액정표시장치는 입사광과 반사광의 상당량을 흡수하는 컬러필터 대신에 광의 흡수가 없는 컬러구현수단으로 콜레스테릭 고분자층과 적, 녹, 청 3색의 염료가 일정한 패턴으로 제공된 고분자층을 사용함으로써, 양호한 반사율과 높은 컨트라스트를 얻을 수 있으며, 반사판 표면의 구조를 비선형으로 형성하여 입사광의 각도에 상관없이 반사광의 각도를 ±30° 이내의 범위로 모아 그 범위내에서 밝은 반사광을 제공하여 고반사율의 컬러화가 가능케 된다.Reflective liquid crystal display device newly implemented according to the present invention as described above is a color implementation means that does not absorb light, instead of a color filter absorbing a considerable amount of incident light and reflected light cholesteric polymer layer and red, green, blue three-color dye By using the polymer layer provided in a uniform pattern, good reflectance and high contrast can be obtained. The structure of the reflecting plate surface is formed non-linearly, and the angle of reflected light is collected within a range of ± 30 ° regardless of the incident light angle. It provides bright reflected light within, enabling high color reflectance.

Claims (4)

액정을 사이에 두고 배치되는 상, 하 기판과; 위에 기재한 상, 하 기판의 액정방향 일측면에 제공된 도전막과; 이 도전막의 액정방향에 제공된 배향막과; 위에 기재한 상 기판의 타측면에 제공된 편광막과; 위에 기재한 하 기판과 전도막 사이에 제공된 반사판과; 이 반사판의 광의 입사면에 제공되고, 입사광을 적, 녹, 청 3색의 가시광으로 전환시키는 컬러구현수단을 포함하는 반사형 액정표시장치.Upper and lower substrates having liquid crystals interposed therebetween; A conductive film provided on one side of the upper and lower substrates in the liquid crystal direction; An alignment film provided in the liquid crystal direction of the conductive film; A polarizing film provided on the other side of the upper substrate described above; A reflector provided between the lower substrate and the conductive film described above; A reflection type liquid crystal display device provided with an incident surface of light of the reflecting plate and including color implementing means for converting the incident light into visible light of three colors of red, green and blue. 제1항에 있어서, 컬러구현수단은 입사광을 적, 녹, 청 3색의 가시광으로 전환시킬 수 있는 피치를 갖는 콜레스테릭 액정과 고분자를 포함하는 콜레스테릭 고분자층을 특징으로 하는 반사형 액정표시장치.The liquid crystal display according to claim 1, wherein the color implementation means comprises a cholesteric liquid crystal having a pitch capable of converting incident light into visible light of three colors of red, green, and blue and a cholesteric polymer layer comprising a polymer. Display. 제1항에 있어서, 위에 언급된 액정은 티엔이나 에스티엔 모드로서, 상, 하 기판면에 수직 또는 경사배향됨을 특징으로 하는 반사형 액정표시장치.The liquid crystal display device according to claim 1, wherein the above-mentioned liquid crystal is a Tien or styrene mode, and is vertically or obliquely aligned to upper and lower substrate surfaces. 제1항에 있어서, 위에 기재한 반사판은 광의 입사면이 비선형 구조로 형성됨을 특징으로 하는 반사형 액정표시장치.The reflective liquid crystal display device according to claim 1, wherein the reflecting plate described above has a non-linear structure in which an incident surface of light is formed.
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