KR930023763A - LCD projector optical system - Google Patents

LCD projector optical system Download PDF

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Publication number
KR930023763A
KR930023763A KR1019920008876A KR920008876A KR930023763A KR 930023763 A KR930023763 A KR 930023763A KR 1019920008876 A KR1019920008876 A KR 1019920008876A KR 920008876 A KR920008876 A KR 920008876A KR 930023763 A KR930023763 A KR 930023763A
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KR
South Korea
Prior art keywords
light
polarization
polarization state
lamp
wave
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Application number
KR1019920008876A
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Korean (ko)
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KR950007038B1 (en
Inventor
나만호
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이헌조
주식회사 금성사
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Priority to KR1019920008876A priority Critical patent/KR950007038B1/en
Publication of KR930023763A publication Critical patent/KR930023763A/en
Application granted granted Critical
Publication of KR950007038B1 publication Critical patent/KR950007038B1/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS 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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor

Abstract

본 발명은 LCD 프로젝터 광학계에 관한 것이다. 종래에는 램프에서 방사된 빛중에서 극히 일부분의 빛, 즉 일정한 1개의 편광만을 사용함으로써 광이용효율이 저하되는 문제점이 되었다. 이를 해결하기 위한 본 발명은 백색광을 방사하는 램프를 포함하는 광원부와, 상기 광원부의 램프에서 방사된 모든 빛을 한방향의 선형 편광상태로 제어하여 투과시키는 편광제어부와, 상기 편광제어부에 의하여 선형편광된 빛을 인가되는 비디오 시그널의 전압에 따라 타원 편광상태로 변화시키는 액정 패널과, 상기 액정 패널에 의해 타원 편광된 빛중 일정한 일방향의 선형편광만을 투과시켜 비디오 시그널의 화상정보를 화상으로 구현하는 편광판과, 상기 화상을 스크린위에 확대 투사하는 프로젝션 렌즈와, 상기 프로젝션 렌즈에 의하여 투사된 빛을 반사 혹은 투과하여 화상을 결상시키는 스크린으로 구성되어 있으며, 상기 편광제어부는 램프에서 방사되는 빛을 평행하게 조사시키기 위한 콜리메이터와, 입사빛의 편광상태를 변환시키는 λ/4-플레이트와, 입사빛의 파장을 분리하여 S파 편광상태의 빛은 투과시키고 P파 편광상태의 빛은 반사하는 S/P파 편광분리 프리즘과, 상기 S/P파 편광분리 프리즘에 의하여 반사된 P파 편광상태의 빛을 재반사하는 반사판으로 구성되어, 램프에서 방사된 모든 빛이 S파 편광상태를 유지하면서 액정 패널로 입사되도록 함으로써 빛의 이용효율을 극대화시킨 것이다.The present invention relates to an LCD projector optical system. Conventionally, light use efficiency is lowered by using only a portion of light emitted from a lamp, that is, a single polarized light. The present invention for solving this problem, a light source unit including a lamp for emitting white light, a polarization control unit for transmitting and transmitting all the light emitted from the lamp of the light source unit in a linear polarization state, and the linearly polarized by the polarization control unit A liquid crystal panel for converting light into an elliptical polarization state according to a voltage of a video signal applied thereto, a polarizing plate for transmitting image information of a video signal as an image by transmitting only linear polarization in a predetermined direction among the elliptical polarized light by the liquid crystal panel; And a projection lens for magnifying and projecting the image onto a screen, and a screen for reflecting or transmitting the light projected by the projection lens to form an image. The polarization controller is configured to irradiate light emitted from a lamp in parallel. Collimator and λ / 4-ple to change the polarization state of incident light S / P wave polarization separation prism that separates the wavelength of incident light and transmits light in S wave polarization state and reflects light in P wave polarization state, and P reflected by the S / P wave polarization separation prism It is composed of a reflecting plate reflecting light of the wave polarization state, so that all the light emitted from the lamp is incident to the liquid crystal panel while maintaining the S wave polarization state to maximize the utilization efficiency of the light.

Description

LCD 프로젝터 광학계LCD projector optical system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도의 (가)(나)(다)(라)는 제4도의 광제어부에서 나타나는 여러편광상태를 보인 도면으로서 (가)는 임의의 편광상태도, (나)는 제1선형 편광상태도, (다)는 타원 편광상태도, (라)는 제2선형 편광상태도, 제4도는 본 발명에 의한 LCD 프로젝터 광학계의 구성도, 제5도는 본 발명 편광제어부의 편광상태 진행과정을 보인 작용도.(A) (b) (c) (d) of FIG. 3 shows various polarization states shown in the light control part of FIG. 4, (a) is an arbitrary polarization state diagram, and (b) is a first linear polarization state diagram. , (C) is an elliptical polarization state diagram, (d) a second linear polarization state diagram, FIG. 4 is a configuration diagram of an LCD projector optical system according to the present invention, and FIG. 5 is a polarization state process of the present invention. Degree.

Claims (4)

백색광을 방사하는 램프(1) 및 리플렉터(2)로 이루어진 광원부(A)와, 상기 광원부(A)의 램프(1)에서 방사된 모든 빛을 한방향의 선형 편광상태로 제어하여 투과시키는 편광제어부(10)와, 상기 편광제어부(10)에 의하여 선형 편광된 빛을 인가되는 비디오 시그널(S)의 전압에 따라 타원 편광상태로 변환시키는 액정 패널(4)과 상기 액정 패널(4)에 의해 타원 편광된 빛중 일정한 일방향의 선형 편광만을 투과시켜 비디오 시그널(S)의 화상정보를 화상으로 구현하는 편광판(5)과, 상기 화상을 스크린위에 확대 투사하는 프로젝션렌즈(6)와, 상기 프로젝션렌즈(6)에 의하여 투사된 빛을 반사 혹은 투과하여 화상을 결상시키는 스크린(7)을 구비하여서 됨을 특징으로 하는 LCD 프로젝터 광학계.A light source unit A consisting of a lamp 1 and a reflector 2 emitting white light, and a polarization control unit for controlling and transmitting all light emitted from the lamp 1 of the light source unit A in a linear polarization state in one direction ( 10) and the elliptical polarization by the liquid crystal panel 4 and the liquid crystal panel 4 for converting the linearly polarized light by the polarization control unit 10 into an elliptical polarization state according to the voltage of the video signal S applied thereto. A polarizing plate 5 which transmits only linear polarization of a predetermined one direction among the light beams and implements the image information of the video signal S as an image, a projection lens 6 for enlarging and projecting the image on the screen, and the projection lens 6 And a screen (7) for reflecting or transmitting the light projected by the image to form an image. 제1항에 있어서, 상기 편광제어부(10)는 램프(1)에서 방사되는 빛을 평행하게 조사시키기 위한 콜리메이터(11)와, 입사빛의 편광상태를 변화시키는 리타데이션부재와, 입사빛의 파장을 분리하여 S파 편광상태의 빛은 투과시키고 P파 편광상태의 빛은 반사하는 S/P파 편광분리 프리즘(13)과, 상기 S/P파 편광분리 프리즘(13)에 의하여 반사된 P파 편광상태의 빛을 재반사하는 반사판(14)으로 구성됨을 특징으로 하는 LCD 프로젝터 광학계.According to claim 1, wherein the polarization control unit 10 is a collimator 11 for irradiating the light emitted from the lamp 1 in parallel, a retardation member for changing the polarization state of the incident light, the wavelength of the incident light P / S polarized light separating prism 13 which transmits light in S-wave polarization state and reflects light in P-wave polarization state, and P wave reflected by S / P wave polarization separating prism 13 LCD projector optical system, characterized in that consisting of a reflecting plate (14) for re-reflecting light in a polarized state. 제1항에 있어서, 상기 편광제어부(10)는 입사빛의 편광상태를 변화시키는 리타데이션부재와, 상기 리타데이션부재를 통과한 빛의 파장을 분리하여 S파는 투과시키고 P파는 반사시키는 S/P파 편광분리 프리즘(13)과, 상기 리타데이션부재와 S/P파 편광분리 프리즘(13)의 상ㆍ하측에 설치된 제1, 제2리플렉터(15)(16)로 구성됨을 특징으로 하는 LCD 프로젝터 광학계.The S / P of claim 1, wherein the polarization control unit 10 separates a retardation member for changing the polarization state of incident light from a wavelength of light passing through the retardation member, and transmits S waves and reflects P waves. LCD projector comprising a wave polarization separation prism (13) and first and second reflectors (15, 16) provided on the upper and lower sides of the retardation member and the S / P wave polarization separation prism (13). Optical system. 제2항 또는 제3항에 있어서, 상기 리타데이션부재는 λ/4-플레이트(12)인 것을 특징으로 하는 LCD 프로젝터 광학계.4. The LCD projector optical system according to claim 2 or 3, wherein the retardation member is lambda / 4-plate (12). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920008876A 1992-05-25 1992-05-25 Lens system for l.c.d. projector KR950007038B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920008876A KR950007038B1 (en) 1992-05-25 1992-05-25 Lens system for l.c.d. projector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920008876A KR950007038B1 (en) 1992-05-25 1992-05-25 Lens system for l.c.d. projector

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KR930023763A true KR930023763A (en) 1993-12-21
KR950007038B1 KR950007038B1 (en) 1995-06-26

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KR1019920008876A KR950007038B1 (en) 1992-05-25 1992-05-25 Lens system for l.c.d. projector

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6478429B1 (en) 1998-10-29 2002-11-12 Fujitsu Limited Reflective projector
KR100867767B1 (en) * 2008-03-21 2008-11-10 서보산업 주식회사 Apparatus for assembling pillars form and method for constructing pillars form

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6478429B1 (en) 1998-10-29 2002-11-12 Fujitsu Limited Reflective projector
KR100867767B1 (en) * 2008-03-21 2008-11-10 서보산업 주식회사 Apparatus for assembling pillars form and method for constructing pillars form

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KR950007038B1 (en) 1995-06-26

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