KR0127226Y1 - Reflection type liquid crystal projector - Google Patents
Reflection type liquid crystal projector Download PDFInfo
- Publication number
- KR0127226Y1 KR0127226Y1 KR2019920027692U KR920027692U KR0127226Y1 KR 0127226 Y1 KR0127226 Y1 KR 0127226Y1 KR 2019920027692 U KR2019920027692 U KR 2019920027692U KR 920027692 U KR920027692 U KR 920027692U KR 0127226 Y1 KR0127226 Y1 KR 0127226Y1
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- light
- image display
- liquid crystal
- display device
- prism
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
- H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
- H04N5/7441—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of liquid crystal 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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
Abstract
본 고안은 반사형 액정 프로젝터에 관한 것이다.The present invention relates to a reflective liquid crystal projector.
일반적인 액정 프로젝터는 광원과 그 방사광이 입사되어 화상표시 장치에 조사시키는 빛분리계 및 화상표시장치의 화상을 스크린에 확대투사시키는 투사렌즈로 구성되어 있는 바, 광원-빛분리계-화상표시장치-투사렌즈-스크린의 계통으로 빛이 전달되므로 빛의 이용효율 저하를 초래한다.A general liquid crystal projector is composed of a light source, a light separator in which its radiation is incident and irradiated onto an image display device, and a projection lens that enlarges and projects an image of the image display device onto a screen. Since light is transmitted to the projection lens-screen system, the light utilization efficiency is reduced.
본 고안은 빛분리계를 제거하고 화상표시장치의 액정층과 접하는 하 얼라인먼트에 프리즘을 형성하면서 프리즘의 반사면 각도를의 식에 의해 설정하여 빛의 전달계통을 단축시킴으로써 빛의 이용효율을 향상시키고 또한 빛분리계 제거에 따른 시스템의 경박단소화를 실현할 수 있도록 된 것이다.The present invention removes the light separation system and forms the prism in alignment with the liquid crystal layer of the image display device, thereby adjusting the reflection surface angle of the prism. By setting the equation to shorten the light transmission system, it is possible to improve the utilization efficiency of the light and to realize the light and short reduction of the system by removing the light separation system.
Description
제1도는 종래 반사형 액정 프로젝터의 구성도.1 is a block diagram of a conventional reflective liquid crystal projector.
제2도는 종래 화상표시 장치인 TN-LCD의 구성도.2 is a configuration diagram of a TN-LCD which is a conventional image display device.
제3도는 종래 다른 화상표시 장치인 PDLC의 구성도.3 is a block diagram of a PDLC which is another conventional image display apparatus.
제4도는 본 고안 반사형 액정 프로젝터의 구성도.4 is a block diagram of a reflective liquid crystal projector of the present invention.
제5도는 본 고안 화상표시 장치의 구성도.5 is a configuration diagram of an image display device of the present invention.
제6도는 본 고안 화상표시 장치의 광변조 계통도.6 is a light modulation scheme of an image display device of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 광원 2 : 화상표시장치1: light source 2: image display device
4 : 스크린 5 : 투사렌즈4: screen 5: projection lens
7 : 액정 8,8a : 상ㆍ하 표면전극7: liquid crystal 8,8a: upper and lower surface electrodes
9,9a : 상ㆍ하 얼라인먼트 10 : 프리즘9,9a: upper and lower alignment 10: prism
본 고안은 반사형 액정 프로젝터에 관한 것으로, 특히 액정표시 장치에 프리즘 형태의 반사층을 형성하여 상향 또는 하향투사를 용이하게하여 빛의 이용 효율을 높이고 구성부품수를 감축시킬 수 있도록 한 프로젝터에 관한 것이다.The present invention relates to a reflective liquid crystal projector, and more particularly, to a projector having a prism type reflective layer formed on a liquid crystal display device to facilitate upward or downward projection, thereby increasing light utilization efficiency and reducing the number of components. .
종래의 반사형 액정 프로젝터는 제1도와 같이 광원(1)과, 광원으로부터 방사된 빛을 화상표시장치(2)에 조사시키는 빛 분리계(3)와, 화상표시장치에 형성된 화상을 스크린(4)에 확대 투사시키는 투사렌즈(5)로 구성되어 있고, 상기의 화상표시장치(2)는 제2도와 같이 빛분리계로부터의 입사광을 일정방향을 편광시키는 편광판(6)과, 액정(7)의 방향을 조절하는 상ㆍ하 표면전극(8)(8a)과, 액정의 초기 방향을 결정하여 주는 상ㆍ하얼라인먼트(9)(9a)로 구성되어 있다. 또한, 상기의 화상표시장치(2)는 제3도와 같이 액정(7) 대신 폴리머 디스퍼스트 액정(Polymer Dispersed LC)(7a)으로 되고 편광판(6)이 제거된 상태로 구성되어 있는 경우도 있다.The conventional reflective liquid crystal projector has a light source 1, a light separation system 3 for irradiating the image display device 2 with light emitted from the light source, and an image formed on the image display device as shown in FIG. The image display device 2 includes a polarizing plate 6 for polarizing a predetermined direction of incident light from a light splitter as shown in FIG. 2 and a liquid crystal 7. The upper and lower surface electrodes 8 (8a) for adjusting the direction of and the upper and lower alignment electrodes 9 (9a) for determining the initial direction of the liquid crystal. In addition, the image display apparatus 2 may be a polymer-dispersed LC 7a instead of the liquid crystal 7 and the polarizing plate 6 may be removed as shown in FIG.
이와같은 종래의 액정 프로젝터는 광원(1)으로부터 방사되는 빛이 빛분리계(3)에 의해 화상표시장치(2)에 조사되면 화상표시장치로부터 화상정보를 갖는 빛은 빛분리계(3)를 투과하여 투사렌즈(5)에 의해 스크린(4)상에 투사되고 광원(1)으로부터 방사된 빛이 빛분리계(3)를 투과, 반사하는 동안 빛의 손실을 보게 되는데, 이러한 빛의 손실은 빛분리계(3)를 통상적인 반투과거울(Half-Mirror)을 사용할 경우 광원(1)→빛분리계(3)→화상표시장치(2)의 과정에서 1/2의 빛손실이 나타나고 다시 화상표시장치(2)→빛분리계(3)→투사렌즈(5)의 과정에서 1/2의 빛손실이 나타나므로 결국 전체과정의 빛 손실은 3/4에 달하게 된다.In the conventional liquid crystal projector, when the light emitted from the light source 1 is irradiated to the image display apparatus 2 by the light splitter 3, the light having image information from the image display apparatus causes the light splitter 3 to emit light. When the light is transmitted and projected onto the screen 4 by the projection lens 5 and the light emitted from the light source 1 passes through and reflects through the light splitter 3, the loss of light is observed. In the case of using a conventional half-mirror for the light splitter (3), light loss of 1/2 appears in the process of the light source (1) to the light splitter (3) to the image display apparatus (2). In the process of the image display device 2 → light separation system 3 → projection lens 5, light loss of 1/2 appears, and eventually the light loss of the entire process reaches 3/4.
따라서 광원(1)으로부터의 빛 이용효율은 1/4을 초과하지 못하여 효율이 크게 저하되는 단점을 갖는 것이며 또한 시스템에 복잡하고 설계가 어려운 단점을 갖는 것이다.Therefore, the light utilization efficiency from the light source 1 does not exceed 1/4, which has a disadvantage in that the efficiency is greatly reduced, and also has a disadvantage in that the system is complicated and difficult to design.
본 고안은 부품을 감축하여 구조를 간단히 하고 설계를 용이하게 함은 물론 빛의 이용 효율을 증대시키고자 함이 목적인 것으로, 이를 위하여 빛분리계를 제거하고 화상표시장치에 프리즘을 형성한 것이다.The present invention aims to simplify the structure by reducing parts and to facilitate the design, as well as to increase the efficiency of light use. For this purpose, the light separation system is removed and a prism is formed in the image display device.
이하, 첨부도면에 의해 본 고안을 상세히 설명하면 다음과 같다.Hereinafter, the present invention in detail by the accompanying drawings as follows.
제4도 내지 제6도와 같이 광원(1)과, 광원의 방사광을 변조시켜 되반사시킬 수 있도록 광원(1)으로부터의 입사광을 일정방향으로 편광시키는 편광판(9), 액정(7)의 방향을 조절하는 상ㆍ하 표면전극(8)(8a)과 액정의 초기 방향을 결정하여 주는 상ㆍ하 얼라인먼트(9)(9a)로 된 화상표시장치(2)와, 화상표시장치(2)에 형성된 화상을 스크린(4)에 확대투사시키는 투사렌즈(5)와, 상기 액정(7)에 접한 하 얼라인먼트(9a)에 형성된 프리즘(10)으로 구성하고, 프리즘(10)의 반사표면 각도(r)와 투사각형 각도(θ1, θ2)의 설정을 다음식에 의하여 결정한다.As shown in FIGS. 4 to 6, the direction of the polarizing plate 9 and the liquid crystal 7 for polarizing the incident light from the light source 1 in a predetermined direction so as to modulate the reflected light of the light source 1 and the light source. The upper and lower surface electrodes 8 (8a) to be adjusted, the image display device 2 formed of the upper and lower alignments 9 and 9a for determining the initial direction of the liquid crystal, and formed in the image display device 2 A reflective lens 5 for projecting an image onto the screen 4 and a prism 10 formed on the lower alignment 9a in contact with the liquid crystal 7, and reflecting surface angle r of the prism 10; And the angle of projection angle (θ 1 , θ 2 ) are determined by the following equation.
여기서,here,
r : 프리즘(10)의 반사표면각도r: reflection surface angle of prism 10
n : 액정(7)의 굴절율n: refractive index of liquid crystal 7
θ1, θ2: 상ㆍ하향 투사각도θ 1 , θ 2 : Up and Down Projection Angles
θ6: 광원(1)과 화상표시장치(2)의 각도이다.θ 6 : The angle between the light source 1 and the image display device 2.
즉, 본 고안은 광원(1)의 반사경의 가상평면과 화상표시장치(2)의 평면법선 및 투사렌즈(5)의 광축과 화상표시장치(2)의 중심법선이 각기 어긋난 각이 이루어지도록 구성한 것이다.That is, the present invention is constructed such that the angle between the virtual plane of the reflector of the light source 1, the plane normal of the image display device 2, the optical axis of the projection lens 5, and the center normal of the image display device 2 is made to be different from each other. will be.
따라서 본 고안은 제4도 내지 제6도와 같이 광원(1)으로부터 화상표시장치(2)의 표면법선에 대한 각도(θ6)로 빛이 조사되면 이 입사광은 액정(7)의 굴절율(n)에 의해 하 얼라인먼트(9a)에 입사되면서 톱니형태의 프리즘(10) 표면에 의해 액정(7)으로 반사된다. 이때 빛은 액정(7)에서 공기층을 투과하여 θ1의 각도로 투사렌즈(5)에 입사되고 투사렌즈(5)는 화상표시장치(2)에 형성된 화상을 스크린(4)에 확대투사하게 되는 것이다.Therefore, when the light is irradiated from the light source 1 to the angle (θ 6 ) with respect to the surface normal of the image display device 2 as shown in FIGS. 4 to 6, the incident light becomes the refractive index n of the liquid crystal 7. By being incident on the alignment 9a, it is reflected by the serrated prism 10 surface to the liquid crystal 7. At this time, the light passes through the air layer in the liquid crystal 7 and enters the projection lens 5 at an angle of θ 1 , and the projection lens 5 projects the image formed on the image display device 2 on the screen 4. will be.
이와같이 빛분리계를 제거하고 광원으로부터 반사광을 일정각도로 화상표시장치(2)에 입사시킴으로써 소기의 목적을 달성할 수 있게된다. 또한 상향투사 또는 하향투사시 θ1을 고려하여 설계를 용이하게 할 수 있으며 투사각도(θ2) 및 광원(1)과 화상표시장치(2)와의 각도(θ6)에 의해 프리즘(10)의 반사면 각도를 결정할 수 있다.In this way, the desired purpose can be achieved by removing the light separation system and injecting the reflected light from the light source into the image display device 2 at a predetermined angle. In addition, the design can be facilitated in consideration of θ 1 during upward projection or downward projection, and the prism 10 can be controlled by the projection angle θ 2 and the angle θ 6 between the light source 1 and the image display device 2. The reflection surface angle can be determined.
이상과 같이 본 고안은 얼라인먼트에 프리즘을 형성하고 광원으로부터의 방사광을 일정각도로 화상표시장치에 직접 입사시킴으로써 빛의 이용효율을 높이게 되었고 빛분리계가 제거됨으로써 시스템의 단순화 및 소형화가 가능하며 아울러 상향 또는 하향의 광투사가 용이한 효과를 갖는다.As described above, the present invention increases the efficiency of light by forming a prism in the alignment and directly injecting the emitted light from the light source into the image display device at a predetermined angle. Downward light projection has an easy effect.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019920027692U KR0127226Y1 (en) | 1992-12-30 | 1992-12-30 | Reflection type liquid crystal projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019920027692U KR0127226Y1 (en) | 1992-12-30 | 1992-12-30 | Reflection type liquid crystal projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR940016912U KR940016912U (en) | 1994-07-25 |
| KR0127226Y1 true KR0127226Y1 (en) | 1998-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019920027692U KR0127226Y1 (en) | 1992-12-30 | 1992-12-30 | Reflection type liquid crystal projector |
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| Country | Link |
|---|---|
| KR (1) | KR0127226Y1 (en) |
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1992
- 1992-12-30 KR KR2019920027692U patent/KR0127226Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
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| KR940016912U (en) | 1994-07-25 |
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