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KR940009156B1 - Lcd light valve - Google Patents

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KR940009156B1
KR940009156B1 KR1019900011477A KR900011477A KR940009156B1 KR 940009156 B1 KR940009156 B1 KR 940009156B1 KR 1019900011477 A KR1019900011477 A KR 1019900011477A KR 900011477 A KR900011477 A KR 900011477A KR 940009156 B1 KR940009156 B1 KR 940009156B1
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liquid crystal
layer
light valve
light
crystal light
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KR920003092A (en
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이재원
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삼성전자 주식회사
강진구
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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
    • G02F1/135—Liquid crystal cells structurally associated with a photoconducting or a ferro-electric layer, the properties of which can be optically or electrically varied
    • 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
    • G02F1/1393—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 birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
    • 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
    • G02F1/135—Liquid crystal cells structurally associated with a photoconducting or a ferro-electric layer, the properties of which can be optically or electrically varied
    • G02F1/1352—Light-reflecting layers

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)

Abstract

내용 없음.No content.

Description

액정 라이트 밸브Liquid crystal light valve

제1도는 종래 액정 라이트 밸브의 개략적 단면도.1 is a schematic cross-sectional view of a conventional liquid crystal light valve.

제2도는 본 발명에 따른 액정 라이트 밸브의 개략적 단면도.2 is a schematic cross-sectional view of a liquid crystal light valve according to the present invention.

제3도는 제2도에 도시된 본 발명 액정 라이트 밸브의 반사층과 입사광의 화소와의 크기를 비교하여 나타내 보인 도면.FIG. 3 is a view showing the size of the reflection layer and the pixel of the incident light of the liquid crystal light valve of the present invention shown in FIG.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 코팅층 2,2a : 투명기판1: coating layer 2,2a: transparent substrate

3,3a : 투명전극 4 : 광도전층3,3a: transparent electrode 4: photoconductive layer

5 : 차광층 6a,6b : 반사막5: Light shielding layer 6a, 6b: Reflective film

7,7a : 배향막 8 : 스페이서7,7a: alignment layer 8: spacer

10 : 입력광 20 : 출력광10: input light 20: output light

LQ : 액정층 P : 화소LQ: liquid crystal layer P: pixel

본 발명은 대형의 이미지 투사장치 및 광학데이터 프로세싱 장치등에 채용되는 액정 라이트밸브에 관한 것으로서, 특히 단층구조의 요소간의 정합 특성이 개선되도록 반사층이 개량된 액정 라이트 밸브에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal light valve employed in a large-scale image projection apparatus, an optical data processing apparatus, and the like, and more particularly, to a liquid crystal light valve in which a reflective layer is improved so that matching characteristics between elements of a single layer structure are improved.

액정 라이트 밸브(Liquid crystal light valve)는 주사되는 입력광의 유무 또는 광량에 따라 그 동적특성이 변화되는 액정(液晶)의 전기광학적 특성을 이용하여 투사되는 출력광을 상기 액정을 통하여 변조하는 것으로서 영상을 구성하는 빛을 증폭하기도 하고 빛의 파장을 변화시키는데도 응용된다. 이러한 액정 라이트 밸브의 용도로는 광의 반사 및 전송투사 시스템과 광학적 자료처리장치등을 들 수 있다.The liquid crystal light valve modulates the projected output light through the liquid crystal by using the electro-optical characteristic of the liquid crystal whose dynamic characteristics change depending on the presence or absence of the input light to be scanned. It is also used to amplify the constituent light and to change the wavelength of light. Such liquid crystal light valves include light reflection and transmission projection systems and optical data processing devices.

종래의 액정 라이트 밸브는 제1도에 도시된 바와 같은 구조를 가진다.The conventional liquid crystal light valve has a structure as shown in FIG.

두매의 평행한 투명기판(2)(2a)의 내면에 AC구동전압이 인가되는 투명한 전극(3)(3a)이 피착 형성되며, 스페이서(8)(8a)에 의해 일정간격을 유지하는 상기 투명기판(2)(2a) 사이의 액정(LQ)은, 그 양측에 위치된 배향막(7)(7a)에 접촉된다. 그리고 입력광(10)이 입사되는 측의 투명기판(2)의 전극(3)과 이에 대향하는 상기 배향막(7)의 사이에는 광도전층(4), 차광층(5), 반사막(6)으로 된 샌드위치층이 개재된다. 도면중에 미설명된 부호 ‘1’은 코팅층, ‘20’은 출력광이다.The transparent electrodes 3 and 3a to which the AC driving voltage is applied are deposited on the inner surfaces of the two parallel transparent substrates 2 and 2a, and the transparent electrodes maintain a predetermined interval by the spacers 8 and 8a. The liquid crystal LQ between the substrates 2 and 2a is in contact with the alignment films 7 and 7a located on both sides thereof. The photoconductive layer 4, the light shielding layer 5, and the reflective film 6 are interposed between the electrode 3 of the transparent substrate 2 on the side where the input light 10 is incident and the alignment layer 7 opposite thereto. Sandwich layer is interposed. In the drawings, reference numeral '1' denotes a coating layer and '20' denotes output light.

이와 같은 액정 라이트 밸브의 동작을 위해서는, 화상신호를 가진 입력광(10)에 의해 여기(勵起)되는 상기 광도전층(光導專層 ; 4)에 의해서 실제 화상을 실현하는데 기여하는 상기 출력광을 복굴절시키는 액정(掖晶)을 동적으로 제어할 수 있도록 하기 위한 제어전압의 스위칭이 일어나야 한다. 따라서 광이 없을때는 절연층의 임피던스가 액정보다 아주 크게 유지되고, 광이 있을 때에는 액정보다 아주 적어지도록(스위칭되도록) 설계되어야 한다. 그러나 상기한 단층구조의 각 요소는 물리적으로 접합되어 있는데, 사실상 접합된 부위 마다의 정합 특성(예를들어 전기적 접촉저항 즉 임피던스)의 편차가 존재한다. 특히 상기한 단층 구조의 각 요소에 있어서의 정합특성은 각 층의 두께가 두꺼운 경우에 불리하게 되는 바, 상기 반사막(6)의 경우는 굴절률이 높고 낮은 2종의 유전물질이 다중으로 적층형성된 것이기 때문에 전체 정합 특성의 악화에 큰 영향을 미친다.For the operation of such a liquid crystal light valve, the output light that contributes to realizing an actual image by the photoconductive layer 4 excited by the input light 10 having an image signal is provided. The switching of the control voltage must occur in order to be able to dynamically control the birefringent liquid crystal. Therefore, in the absence of light, the impedance of the insulating layer is maintained to be much larger than that of the liquid crystal, and in the presence of light should be designed to be much smaller (switched) than the liquid crystal. However, each element of the single-layer structure described above is physically bonded, and in fact, there are variations in matching characteristics (for example, electrical contact resistance, or impedance) for each bonded portion. In particular, the matching property of each element of the single layer structure is disadvantageous in the case where the thickness of each layer is thick. In the case of the reflective film 6, two dielectric materials having a high refractive index and a low refractive index are formed in multiple layers. This greatly affects the deterioration of the overall registration characteristics.

이러한 반사막은 대개가 SiO2와 TiO2또는 MgF2와 ZnS로 된 소재층이 10층이상 적층 형성된 것으로 이를 통하여 약 95%의 높은 반사률을 얻을 수 있다. 그러나 완전반사가 일어나는 파장 영역은 특정한 기준 파장을 중심으로 두 물질의 굴절율차에 따라 ±수십 nm에 불과하므로 전가시광 영역에 대한 완전반사를 기대할 수 없다. 이러한 문제를 해결하기 위하여는 여러 기준 파장을 가지는 유전체 반사막을 다중으로 적층 형성해야 하므로 전체적인 두께의 증가는 필연적이다. 결과적으로 제조단가는 증가함은 물론 막의 두께가 증가함으로 반사막의 응력이 증가하여 인접된 다른 층, 예를들어 광도전층이나 차광층에 대한 접합특성이 매우 불량하게 되고, 이로 인해 제품의 신뢰성이 저하되게 된다. 이를 개선하는 방안으로서 미국특허 4799773호를 통하여 별도의 접합층을 가지는 액정 라이트 밸브가 공개된 바 있는데, 이와 같은 액정 라이트 밸브는 임피던스 매칭을 위하여 광도전층의 두께가 더욱 두꺼워져야 하는 문제점을 내포하고 있어서, 제작 비용의 증대는 물론 생산성 저하의 결과를 낳는다. 더우기 반사층의 반사영역이 좁기 때문에 별도의 개선수단으로서 광원에 필터등을 부착해야 하는 등의 문제점을 가지고 있다.Such reflective films are usually formed by stacking 10 or more layers of material layers consisting of SiO 2 and TiO 2 or MgF 2 and ZnS, thereby obtaining a high reflectance of about 95%. However, the full reflection range is only ± several tens of nm depending on the difference in refractive index between two materials around a specific reference wavelength. In order to solve this problem, it is necessary to stack a plurality of dielectric reflective films having various reference wavelengths, so that the overall thickness is inevitably increased. As a result, the manufacturing cost increases, and as the thickness of the film increases, the stress of the reflecting film increases, so that the bonding characteristics of other adjacent layers, for example, the photoconductive layer or the light shielding layer, are very poor. Will be. As a method of improving this problem, a liquid crystal light valve having a separate bonding layer has been disclosed through US Patent No. 4799773. Such a liquid crystal light valve has a problem that the thickness of the photoconductive layer must be thicker for impedance matching. As a result, the production cost increases as well as the productivity decreases. Furthermore, since the reflective area of the reflective layer is narrow, there is a problem of attaching a filter or the like to the light source as an additional improvement means.

본 발명은 제조단가가 저렴하고 그 제조가공이 용이한 액정 라이트 밸브를 제공함에 그 목적이 있다.It is an object of the present invention to provide a liquid crystal light valve having low manufacturing cost and easy manufacturing.

상기의 목적을 달성하기 위하여 본 발명은, 화상신호를 담은 입력광에 의해 임피던스가 변화되는 광도전층과, 일정 전위의 전압에 의해 입사된 출력광을 복굴절시키는 액정을 포함하는 복굴절수단층과, 상기 복굴절수단층과 상기 광도전층 사이에 개재되는 차광층과, 상기 복굴절수단의 구동전압을 제공하는 전극을 구비한 액정 라이트 밸브에 있어서, 상기 반사막을 금속성의 박막조각들로 이루어지도록 하여 된 점에 그 특징이 있다.In order to achieve the above object, the present invention provides a birefringence means layer comprising a photoconductive layer whose impedance is changed by an input light containing an image signal, and a liquid crystal which birefringes output light incident by a voltage having a predetermined potential, and A liquid crystal light valve having a light blocking layer interposed between a birefringent means layer and the photoconductive layer, and an electrode for providing a driving voltage of the birefringent means, wherein the reflective film is made of thin metal pieces. There is a characteristic.

이상과 같은 본 발명에 있어서, 상기 반사막의 소재로는 Al, Ag, Cu, Au등이 사용될 수 있는 바, 그 두께는 최대 1000Å 정도로서 종래 유전체 반사막에 대해 1/30 내지 1/40정에 불과하다. 그리고 반사막의 기본 단위인 금속성 박막조각은 질서정연하게 정렬된 동일한 크기를 가질 수도 있으나 무작위하게 불규칙한 크기를 가질 수도 있는 바, 그 크기는 입력광의 한 화소보다 극히 작아야 바람직하다.In the present invention as described above, as the material of the reflective film, Al, Ag, Cu, Au, etc. can be used, the thickness thereof is up to about 1000Å, only 1/30 to 1/40 tablets with respect to the conventional dielectric reflective film . In addition, the metallic thin film fragments, which are the basic units of the reflective film, may have the same size, but may be randomly irregular in size, and the size is preferably smaller than one pixel of the input light.

이하 첨부된 도면을 참조하면서 본 발명의 한 실시예를 상세히 설명한다.Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

제2도에 본 발명의 액정 라이트 밸브가 도시되어 있다. 이 액정 라이트 밸브는 통상적인 액정 라이트 밸브와 대략 동일한 단층적 구조를 가지는 바, 두매의 평행한 투명기판(2)(2a)의 내면에 AC구동전압이 인가되는 투명전극(3)(3a)가 피착 형성되며, 스페이서(8)(8a)에 의해 일정간격을 유지하는 상기 투명기판(2)(2a)의 사이의 액정(LQ)은 그 양측의 배향막(7)(7a)에 접촉되게 된다. 그리고 입력광(10)이 입사되는 측의 투명기판(2)의 전극(3)과 이에 대향되는 상기 배향막(7)의 사이에는 광도전층(4), 차광층(5), 반사막(6b)으로 된 샌드위치층이 개재된다.2 shows a liquid crystal light valve of the present invention. The liquid crystal light valve has a single layer structure which is approximately the same as a conventional liquid crystal light valve. The transparent electrodes 3 and 3a to which an AC driving voltage is applied to an inner surface of two parallel transparent substrates 2 and 2a are provided. The liquid crystal LQ between the transparent substrates 2 and 2a, which is formed to be deposited and maintains a constant distance by the spacers 8 and 8a, is brought into contact with the alignment films 7 and 7a on both sides thereof. The photoconductive layer 4, the light shielding layer 5, and the reflective film 6b are disposed between the electrode 3 of the transparent substrate 2 on the side where the input light 10 is incident and the alignment layer 7 opposite thereto. Sandwich layer is interposed.

이때에 상기 광도전층은 i형 비정질 실리콘으로 이루어지며, 상기 차광층은 CdTe 혹은 붕소가 도핑된 P형 비정질 실리콘층으로 이루어진다. 그리고 상기한 반사막(6b)은 본 발명의 특징적 요소로서, 제3도에 도시된 바와 같이 Al, Ag, Cu, Au등이 스퍼터링법이나 진공 증착법에 의해 형성된 후 사진 식각법이나 리프트 오프법에 의해 화소(P)보다 극히 작은 크기의 미세한 조각으로 분리 형성된 금속조각(6b′)들로 이루어지고, 그 외는 부분적으로 상기 배향막(7)의 소재가 침투되게 되어 차광층(5)에 직접 접촉되게 된다. 이러한 반사막(6a)은 그 두께가 최대 1000Å 정도로서 제3도에 도시된 바와 같이 미세한 동일크기의 금속조각(6a′)이 질서 정연하게 정렬되거나, 제3도에 도시된 바와 같이 불균일한 크기로 무작위한 산재될 수도 있으나 그 크기는 한 화소의 크기(수십 ㎛)보다 작은 수 ㎛ 정도의 크기를 가지게 한다. 그리고 상기한 차광층(5)은 상기한 바와 같이 저항이 높고 에너지 밴드갭이 적어서 광흡수도가 높은 p형 비정질 실리콘외에 Ge나 CdTE등을 사용할 수 있다.In this case, the photoconductive layer is made of i-type amorphous silicon, and the light blocking layer is made of P-type amorphous silicon layer doped with CdTe or boron. The reflective film 6b is a characteristic element of the present invention. As shown in FIG. 3, Al, Ag, Cu, Au, etc. are formed by sputtering or vacuum evaporation, followed by photolithography or lift-off. It consists of metal fragments 6b 'separated into fine pieces of an extremely small size than the pixel P, and the other part of the material of the alignment layer 7 is infiltrated to directly contact the light shielding layer 5. . The reflective film 6a has a maximum thickness of about 1000 micrometers, and fine metal fragments 6a 'of the same size are arranged in an orderly manner as shown in FIG. 3, or randomly unevenly sized as shown in FIG. One size may be scattered, but the size may be several micrometers smaller than the size of one pixel (tens of micrometers). As described above, the light shielding layer 5 may use Ge, CdTE, or the like, in addition to p-type amorphous silicon having high resistance and low energy band gap and high light absorption.

이러한 본 발명의 액정 라이트 밸브는 통상의 액정 라이트 밸브와 같은 방법으로 동작되게 되는 바, 화상신호가 실린 입력광(10)이 입사되게 되면 화소가 화소사이의 휘도차에 의해 광도전층(4)에서의 임피던스가 화상신호에 따라 변화되고 이로인해 전면투명기판(2a)으로 입사한 출력광(20)이 일정방향으로 배향되는 액정층(LQ)에 의해 복굴절되어 재반사 되고 상기 금속막으로 반사된 후 액정층을 통해 스크린상에 화상이 재현되게 된다. 이때에 광도전층(4)의 임피던스의 변화에 기여한 입력광(10)은 상기한 차광층(5)에 의해 완전 흡수된다.The liquid crystal light valve of the present invention is operated in the same manner as a conventional liquid crystal light valve. When an input light 10 carrying an image signal is incident, a pixel is emitted from the photoconductive layer 4 due to a luminance difference between pixels. The impedance of is changed in accordance with the image signal, which causes the output light 20 incident on the front transparent substrate 2a to be birefringed and re-reflected by the liquid crystal layer LQ oriented in a predetermined direction, and then reflected by the metal film. The image is reproduced on the screen through the liquid crystal layer. At this time, the input light 10 contributing to the change of the impedance of the photoconductive layer 4 is completely absorbed by the light shielding layer 5 described above.

그리고 액정(LQ)에 의한 출력광(20)의 복굴절은 상기 광도전층(4)의 임피던스 변화에 의해 이루어지게 되는 바, 본 발명에 있어서는 도체인 금속성 반사막(6b)이 채용되기 때문에 임피던스의 매칭에는 영향을 미치지 않게 되는 바, 전체적인 임피던스 매칭은 부분적으로 직접 접촉되는 배향막과 광도전층 및 차광층(실제적으로는 배향막이 접촉되는 액정과 상기 광도전층)에 의해 결정되게 된다. 따라서 본 발명의 액정 라이트 밸브는 액정이 입력광에 의해 매우 기민하게 되도록 되어 있기 때문에 화질에 있어서도 종래에 비해 뛰어나고, 그 제조가도 저렴하다.The birefringence of the output light 20 by the liquid crystal LQ is caused by the impedance change of the photoconductive layer 4. In the present invention, since the metallic reflective film 6b, which is a conductor, is employed, impedance matching is not required. The overall impedance matching is determined by the alignment film, the photoconductive layer and the light shielding layer (actually, the liquid crystal and the photoconductive layer to which the alignment film is in contact), which are partially in direct contact. Therefore, the liquid crystal light valve of the present invention is excellent in image quality compared to the conventional one because the liquid crystal is very agile by the input light, and the production thereof is also cheap.

이상에서 상세히 설명한 본 발명의 액정 라이트 밸브의 특징은 다음과 같이 요약된다.Features of the liquid crystal light valve of the present invention described in detail above are summarized as follows.

1) 반사막의 소재로서 일반적 무기재료인 유전체가 사용되지 않기 때문에 전체적인 임피던스 매칭에 유리하고, 그 두께도 종래에 비해 현저히 낮출 수 있다.1) Since a dielectric material, which is a general inorganic material, is not used as the material of the reflective film, it is advantageous for overall impedance matching, and its thickness can be significantly lower than in the related art.

2) 제조 공정에 있어서도, 다중의 박막 형성 공정이 요구되던 종래의 반사막과는 달리 일회의 금속막 형성 공정과 일회의 에칭공정만이 요구되므로 제조 공정이 단축을 통한 생산성 향상을 기할 수 있다.2) In the manufacturing process, unlike the conventional reflective film that required multiple thin film formation processes, only one metal film formation process and one etching process are required, so that the manufacturing process can improve productivity through shortening.

3) 그 특성면에 있어서도, 전파장대의 걸쳐서 종래보다 높은 반사률을 가지고, 이러한 특징을 통하여 천연색의 기종에 적합하다.3) In terms of its characteristics as well, it has a higher reflectance than the conventional one over the electric wave pole, and is suitable for natural color models through such characteristics.

4) 전체 단층 요소중 차광층, 반사막의 두께가 감소되므로 계면간의 접합특성이 양호하고 응력의 집중이 완화되기 때문에 제품의 높은 신뢰성이 확보된다.4) Since the thickness of the light shielding layer and the reflective film is reduced among all the single layer elements, the bonding characteristics between the interfaces are good and the concentration of stress is alleviated, thus ensuring high reliability of the product.

5) 광원에 대한 조건이나 이를 교정하고자 하는 보정 필터등이 요구되지 않기 때문에 전체 시스템의 가격을 낮출 수 있다.5) The price of the entire system can be lowered because no conditions for the light source or a correction filter to correct it are required.

Claims (3)

화상신호를 담은 입력광에 의해 임피던스가 변화되는 광도전층과, 일정 전위의 전압에 의해 입사된 출력광을 복굴절시키는 액정을 포함하는 복굴절수단층과, 상기 복굴절수단층과 상기 광도전층 사이에 개재되는 차광층과, 상기 복굴절수단의 구동전압을 제공하는 전극을 구비한 액정 라이트 밸브에 있어서, 상기 반사막이 한 화소보다 작은 크기의 금속성의 박막 조각들로 이루어지며, 상기 배향막과 차광층이 부분적으로 직접 접촉되도록 구성한 것을 특징으로 하는 액정 라이트 밸브.A birefringence means layer comprising a photoconductive layer whose impedance is changed by an input light containing an image signal, a liquid crystal which birefringes output light incident by a voltage of a predetermined potential, and interposed between the birefringence means layer and the photoconductive layer. A liquid crystal light valve having a light blocking layer and an electrode for providing a driving voltage of the birefringent means, wherein the reflecting film is made of thin metal thin films having a size smaller than one pixel, and the alignment film and the light blocking layer are partially directly A liquid crystal light valve, configured to be in contact. 제1항에 있어서, 상기 반사막이 Al, Ag, Cu, Au중에 선택된 최소한 하나 이상의 금속 혹은 그 결합물로 이루어지도록 된 것을 특징으로 하는 액정 라이트 밸브.The liquid crystal light valve of claim 1, wherein the reflective film is made of at least one metal selected from Al, Ag, Cu, Au, or a combination thereof. 제1항 내지 제2항중 어느 한 항에 있어서, 상기 반사막의 두께가 최대 1000Å인 것을 특징으로 하는 액정 라이트 밸브.The liquid crystal light valve according to any one of claims 1 to 2, wherein the reflective film has a thickness of at most 1000 kPa.
KR1019900011477A 1990-07-27 1990-07-27 Lcd light valve Expired - Fee Related KR940009156B1 (en)

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