KR20010017403A - Illuminating System for Liquid Crystal Display Projector - Google Patents

Illuminating System for Liquid Crystal Display Projector Download PDF

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Publication number
KR20010017403A
KR20010017403A KR1019990032894A KR19990032894A KR20010017403A KR 20010017403 A KR20010017403 A KR 20010017403A KR 1019990032894 A KR1019990032894 A KR 1019990032894A KR 19990032894 A KR19990032894 A KR 19990032894A KR 20010017403 A KR20010017403 A KR 20010017403A
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South Korea
Prior art keywords
light beam
liquid crystal
light
lens
light source
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KR1019990032894A
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Korean (ko)
Inventor
엄기태
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구자홍
엘지전자 주식회사
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Priority to KR1019990032894A priority Critical patent/KR20010017403A/en
Publication of KR20010017403A publication Critical patent/KR20010017403A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141Constructional details thereof
    • H04N9/315Modulator illumination systems
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0009Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE: An illumination system for a liquid crystal projecting device is provided to improve efficiency of light beam emitted from a light source and to improve luminance level of the same. CONSTITUTION: The illumination system for a liquid crystal projecting device includes a light source(12), the first elliptical reflecting mirror(14), the second elliptical reflecting mirror(16), a load lens(20), and a spherical lens(18). The light source(12) is located at the first focus point, and generates light beam. The first elliptical reflecting mirror(14) reflects the light beam. The second elliptical reflecting mirror(16) focuses light beam reflected from the first elliptical reflecting mirror(14) on the second focus point. The load lens(20) makes light beam focused on the second focus point parallel. The spherical lens(18) transmits light beam focused on the second focus point to the load lens(20).

Description

액정투사장치용 조명계{Illuminating System for Liquid Crystal Display Projector}Illuminating System for Liquid Crystal Display Projector

본 발명은 액정투사장치에 관한 것으로, 특히 광원에서 출사되는 광빔의 효율을 향상시키도록 구성된 액정투사장치용 조명계에 관한 것이다.The present invention relates to a liquid crystal projection apparatus, and more particularly, to an illumination system for a liquid crystal projection apparatus configured to improve the efficiency of a light beam emitted from a light source.

통상적으로 광원과 조명계로 구성되어 필름, 화상 등을 확대하여 스크린에 투사하는 프로젝터(Projector)들은 음극선관을 채용한 프로젝션 장치들이 일반화 되어 있으며, 최근에는 액정패널(Liquid Crystal Display)을 장착한 프로젝션 장치들이 보급되고 있는 추세이다. 이때, 액정패널을 채용한 프로젝션 장치들은 광원으로 부터의 광빔을 액정패널(Liquid Crystal Panel)로 입사시키기 위한 조명계를 사용하게 된다. 이러한, 조명계에서는 광원에서 출사된 광빔중 상당량의 광은 실제로 액정패널에 입사되지 못하게 된다. 도 1 및 도 2를 결부하여 이에 대하여 살펴보기로 한다.In general, projectors, which are composed of a light source and an illumination system, to enlarge a film, an image, and the like onto a screen, are commonly used in projection devices employing a cathode ray tube, and recently, a projection device equipped with a liquid crystal display. Is spreading. In this case, projection apparatuses employing a liquid crystal panel use an illumination system for injecting a light beam from a light source into a liquid crystal panel. In such an illumination system, a considerable amount of light emitted from the light source does not actually enter the liquid crystal panel. This will be described with reference to FIGS. 1 and 2.

도 1에 도시된 바와같이 종래의 액정투사장치용 조명계는 광빔을 발생하는 광원(2)과, 광빔을 반사시키는 타원반사경(4)과, 타원반사경(4)에서 반사된 광빔중 초점에 집속된 광빔을 평행하게 진행시키는 로드렌즈(6)를 구비한다. 광원(2)에서 발생된 광빔은 반사면이 타원형태로 구성된 타원반사경(4)에 의해 반사된다. 이때, 타원반사경(4)에 의해 광빔은 타원면의 다른 초점으로 집속되어 진행하게 된다. 초점으로 집속된 광빔은 로드렌즈(6)에 의해 평행하게 진행하여 LCD(도시되지 않음)로 전달되게 된다. 한편, 도 2에 도시된 바와같이 광원(2)에서 출사되는 광빔중 실선으로 도시된 유효광만이 타원반사면에 반사되어 초점으로 집속된다. 반면에 광빔중 점선으로 도시된 손실광은 초점의 외부로 진행하므로, 조명계에 사용되지 못하고 소모된다. 이러한 손실광에 의해 광원에서 출사되는 광빔의 효율이 저하되게 된다.As shown in FIG. 1, a conventional illumination system for a liquid crystal projection apparatus focuses on a light source 2 for generating a light beam, an elliptical reflector 4 for reflecting the light beam, and a focus among light beams reflected by the ellipsoidal reflector 4. A rod lens 6 for advancing the light beam in parallel is provided. The light beam generated by the light source 2 is reflected by an elliptical reflector 4 whose reflective surface is formed in an elliptical shape. At this time, the light beam is focused by the ellipsoidal reflector 4 to another focal point of the ellipsoidal plane. The light beam focused at the focal point travels in parallel by the rod lens 6 and is transmitted to the LCD (not shown). On the other hand, as shown in FIG. 2, only the effective light shown by the solid line of the light beams emitted from the light source 2 is reflected on the ellipsoidal reflecting surface to focus on the focus. On the other hand, the lost light shown by the dotted line in the light beam travels out of the focus, and thus is not used in the illumination system and is consumed. The loss of light reduces the efficiency of the light beam emitted from the light source.

따라서, 본 발명의 목적은 광원에서 출사되는 광빔의 효율을 향상시키도록 구성된 액정투사장치용 조명계를 제공 하는데 있다.Accordingly, it is an object of the present invention to provide an illumination system for a liquid crystal projection apparatus configured to improve the efficiency of a light beam emitted from a light source.

도 1은 종래의 액정투사장치용 조명계중 반사경의 구성을 도시한 도면.1 is a view showing the configuration of a reflector of a conventional illumination system for a liquid crystal projector.

도 2는 도 1의 반사경에서의 광경로를 설명하기 위해 도시한 도면.FIG. 2 is a diagram illustrating an optical path in the reflector of FIG. 1. FIG.

도 3은 본 발명의 액정투사장치용 조명계의 구성을 도시한 도면.3 is a view showing the configuration of an illumination system for a liquid crystal projection apparatus of the present invention.

도 4는 도 3의 반사경에서의 광경로를 설명하기 위해 도시한 도면.FIG. 4 is a diagram illustrating an optical path in the reflector of FIG. 3. FIG.

도 5는 도 3의 구형렌즈에서의 광경로를 설명하기 위해 도시한 도면.FIG. 5 is a diagram for explaining an optical path in the spherical lens of FIG. 3; FIG.

도 6은 도 3의 로드렌즈 에서의 광경로를 설명하기 위해 도시한 도면.FIG. 6 is a diagram illustrating an optical path in the rod lens of FIG. 3. FIG.

〈 도면의 주요 부분에 대한 부호의 설명 〉<Description of the code | symbol about the principal part of drawing>

2,12 : 광원 4,14,16 : 타원반사경2,12 light source 4,14,16 elliptical reflector

6,18 : 구형렌즈 20 : 로드렌즈6,18: spherical lens 20: rod lens

상기 목적을 달성하기 위하여 본 발명의 액정투사장치용 조명계는 제1 타원반사경에서 반사된 광빔을 제2 초점에 집속시키는 제2 타원반사경과, 제2 초점에 집속된 광빔을 평행하게 진행시키는 로드렌즈와, 제2 초점에 집속된 광빔을 로드렌즈에 전달하는 구형렌즈를 구비한다.In order to achieve the above object, the illumination system for a liquid crystal projector according to the present invention includes a second elliptical reflector for focusing a light beam reflected from a first ellipsoidal mirror to a second focus, and a rod lens for parallelly traveling a light beam focused on a second focus. And a spherical lens for transmitting the light beam focused on the second focal point to the rod lens.

상기 목적외에 본 발명의 다른 목적 및 특징들은 첨부도면을 참조한 실시예에 대한 설명을 통하여 명백하게 드러나게 될 것이다.Other objects and features of the present invention other than the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.

도 3 내지 도 6을 참조하여 본 발명의 바람직한 실시예에 대하여 설명 하기로 한다.With reference to Figures 3 to 6 will be described a preferred embodiment of the present invention.

도 3을 참조하면, 본 발명의 액정표시장치용 조명계는 제1 초점위치에 배치되어 광빔을 발생하는 광원(12)과, 상기 광빔을 반사시키는 제1 타원반사경(14)과, 제1 타원반사경(14)에서 반사된 광빔을 제2 초점위치에 집속시키는 제2 타원반사경(16)과, 제2 초점위치(f2)에 집속된 광빔을 평행하게 진행시키는 로드렌즈(20)와, 제2 초점위치(f2)에 집속된 광빔을 로드렌즈(20)에 전달하는 구형렌즈(18)를 구비한다. 제1 초점(f1)에 배치된 광원(12)에서 출사된 광빔은 도 4에 도시된 바와같이 제1 타원반사경(12)에 의해 반사되어 제2 초점(f2)으로 진행하게 된다. 또한, 제1 타원반사경(12)에 의해 반사된 광빔중 일부는 제1 타원반사경(12)과 인접하게 배치된 제2 타원반사경(16)으로 반사되게 된다. 이때, 제2 타원반사경(16)으로 진행된 광빔은 도 4에 도시된 바와같이 타원면에 의해 제2 초점(f2)으로 집속되게 된다. 제1 및 제2 타원반사경(14,16)에 의해 제2 초점(f2)으로 집속된 광빔은 구형렌즈(18)를 경유하여 로드렌즈(20)로 진행하게 된다. 도 5를 결부하여 이에 대하여 상세하게 살펴보기로 한다. 제2 초점(f2)으로 집속된 광빔은 구형렌즈(18)의 표면에 거의 수직으로 입사되게 된다. 이 경우, 구형렌즈(18)의 표면은 AR코팅 처리되어 있으며, 입사각이 거의 0°에 가깝기 때문에 입사시의 반사에 의한 손실이 거의 없게 된다. 이때, 구형렌즈(18)는 로드렌즈(20)의 입사면측에 장착되어 있다.Referring to FIG. 3, an illumination system for a liquid crystal display device according to the present invention includes a light source 12 disposed at a first focal position and generating a light beam, a first elliptical reflector 14 reflecting the light beam, and a first ellipsoidal reflector. A second ellipsoidal reflector 16 for focusing the light beam reflected at 14 to the second focus position, a rod lens 20 for advancing the light beam focused at the second focus position f2 in parallel, and a second focus And a spherical lens 18 for transmitting the light beam focused at the position f2 to the rod lens 20. As shown in FIG. 4, the light beam emitted from the light source 12 disposed at the first focal point f1 is reflected by the first ellipsoidal reflector 12 to travel to the second focal point f2. In addition, a portion of the light beam reflected by the first elliptical reflector 12 is reflected by the second elliptical reflector 16 disposed adjacent to the first elliptical reflector 12. At this time, the light beam propagated to the second ellipsoidal reflector 16 is focused to the second focal point f2 by the ellipsoid as shown in FIG. 4. The light beams focused at the second focal point f2 by the first and second ellipsoidal reflectors 14 and 16 proceed to the rod lens 20 via the spherical lens 18. 5 will be described in detail with reference to FIG. The light beam focused at the second focal point f2 is incident almost perpendicularly to the surface of the spherical lens 18. In this case, the surface of the spherical lens 18 is AR coated, and since the incident angle is nearly 0 °, there is almost no loss due to reflection at the time of incidence. At this time, the spherical lens 18 is mounted on the incident surface side of the rod lens 20.

한편, 구형렌즈(18)를 경유하여 로드렌즈(20)로 입사된 광빔을 평행광에 가깝게 만들어 준다. 도 6을 결부하여 이에 대하여 살펴보기로 한다. 로드렌즈(20)는 4면 모두에 테이퍼 형태의 각을 가지고 있다. 각 면의 표면에는 반사코팅을 하여 입사된 광빔중에 전반사 조건을 만족하지 못하는 각도의 광빔도 반사되도록 구성되어 있다. 또한, 입사된 광빔이 로드렌즈(20)의 표면에 반사되면 될 수록 그 진행각도가 작게 하므로 평행광에 가까운 광빔을 만들게 된다.On the other hand, the light beam incident on the rod lens 20 via the spherical lens 18 is made close to parallel light. This will be described with reference to FIG. 6. The rod lens 20 has tapered angles on all four surfaces. The surface of each surface is configured to reflect light beams of angles that do not satisfy the total reflection condition among the incident light beams by reflection coating. In addition, as the incident light beam is reflected on the surface of the rod lens 20, the advancing angle becomes smaller, thereby making the light beam close to parallel light.

또한, 도 4에 도시된 바와같이 광원(12)에서 출사된 광빔중 일부는 점선으로 도시된 바와같이 초점의 외부로 진행하게 된다. 이러한 광빔은 조명계에 사용되지 못하고 소모되게 된다. 본 발명의 조명계에서 소모되는 광량은 종래 손실광의 일부에 해당하므로 종래에 비해 광원에서 출사되는 광빔의 효율을 향상됨을 알 수 있다.In addition, as shown in FIG. 4, some of the light beams emitted from the light source 12 travel out of the focal point as shown by the dotted lines. Such light beams cannot be used in an illumination system and are consumed. Since the amount of light consumed in the illumination system of the present invention corresponds to a part of the conventional lost light, it can be seen that the efficiency of the light beam emitted from the light source is improved compared to the conventional.

상술한 바와같이, 본 발명의 액정투사장치용 조명계는, 광원에서 출사되는 광빔의 효율을 향상시킬수 있는 장점이 있다.As described above, the illumination system for the liquid crystal projection apparatus of the present invention has an advantage of improving the efficiency of the light beam emitted from the light source.

또한, 본 발명의 액정투사장치용 조명계는 액정투사장치의 휘도레벨을 높일수 있는 장점이 있다.In addition, the illumination system for the liquid crystal projection device of the present invention has the advantage of increasing the luminance level of the liquid crystal projection device.

이상 설명한 내용을 통해 당업자 라면 본 발명의 기술사상을 일탈하지 아니하는 범위에서 다양한 변경 및 수정이 가능함을 알수 있을 것이다. 따라서, 본 발명의 기술적 범위는 명세서의 상세한 설명에 기재된 내용으로 한정되는 것이 아니라 특허 청구의 범위에 의해 정하여 져야만 할 것이다.Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (4)

제1 초점에 배치되어 광빔을 발생하는 광원과, 상기 광빔을 반사시키는 제1 타원반사경을 구비하는 액정투사장치용 조명계에 있어서,In the illumination system for a liquid crystal projection apparatus having a light source disposed at a first focal point and generating a light beam, and a first elliptical reflector reflecting the light beam, 상기 제1 타원반사경에서 반사된 광빔을 제2 초점에 집속시키는 제2 타원반사경과,A second elliptical reflector for focusing the light beam reflected by the first ellipsoidal reflector to a second focal point, 상기 제2 초점에 집속된 광빔을 평행하게 진행시키는 로드렌즈와,A rod lens for traveling the light beam focused on the second focal point in parallel; 상기 제2 초점에 집속된 광빔을 로드렌즈에 전달하는 구형렌즈를 구비하는 것을 특징으로 하는 액정투사장치용 조명계.And a spherical lens for transmitting the light beam focused on the second focal point to the rod lens. 제 1 항에 있어서,The method of claim 1, 상기 제2 타원반사경이 상기 제1 타원반사경과 인접하게 배치된 것을 특징으로 하는 액정투사장치용 조명계.And the second ellipsoidal reflector is disposed adjacent to the first ellipsoidal reflector. 제 1 항에 있어서,The method of claim 1, 상기 구형렌즈가 상기 로드렌즈에 장착된 것을 특징으로 하는 액정투사장치용 조명계.And the spherical lens is mounted on the rod lens. 제 1 항에 있어서,The method of claim 1, 상기 제1 초점이 발광점이고 상기 제2 초점이 수광점인 것을 특징으로 하는 액정투사장치용 조명계.And said first focus is a light emitting point and said second focus is a light receiving point.
KR1019990032894A 1999-08-11 1999-08-11 Illuminating System for Liquid Crystal Display Projector KR20010017403A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06130301A (en) * 1992-10-20 1994-05-13 Ikegami Tsushinki Co Ltd Method and device for converged lighting
JPH07168097A (en) * 1994-09-16 1995-07-04 Casio Comput Co Ltd Light equipment
JPH1020239A (en) * 1996-07-04 1998-01-23 Canon Inc Illuminator and flash light emitting device for photographing
JPH10221693A (en) * 1997-02-10 1998-08-21 Mitsubishi Electric Corp Light source device
JPH10288739A (en) * 1997-04-16 1998-10-27 Olympus Optical Co Ltd Light source optical system for endoscope

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06130301A (en) * 1992-10-20 1994-05-13 Ikegami Tsushinki Co Ltd Method and device for converged lighting
JPH07168097A (en) * 1994-09-16 1995-07-04 Casio Comput Co Ltd Light equipment
JPH1020239A (en) * 1996-07-04 1998-01-23 Canon Inc Illuminator and flash light emitting device for photographing
JPH10221693A (en) * 1997-02-10 1998-08-21 Mitsubishi Electric Corp Light source device
JPH10288739A (en) * 1997-04-16 1998-10-27 Olympus Optical Co Ltd Light source optical system for endoscope

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