KR0178710B1 - Polarized light illuminator - Google Patents
Polarized light illuminator Download PDFInfo
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- KR0178710B1 KR0178710B1 KR1019920008364A KR920008364A KR0178710B1 KR 0178710 B1 KR0178710 B1 KR 0178710B1 KR 1019920008364 A KR1019920008364 A KR 1019920008364A KR 920008364 A KR920008364 A KR 920008364A KR 0178710 B1 KR0178710 B1 KR 0178710B1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- Optics & Photonics (AREA)
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Abstract
입사광선의 편광성분드을 동일한 편광성분으로 변환하여 액정패널에 투사하는 광학시스템에 있어서, 입사광선을 수직편광성분과 평행편광성분으로 분리하는 편광분리수단과, 상기 편광분리수단에서 발생하는 편광성분중의 어느 하나를 광학적 활성도(Optical Activity)를 이용하여 다른 편광성분으로 변환하는 수단과, 상기의 분리수단 및 변환수단에서 투사되는 동일한 편광성분이 액정패널로 진행하도록하는 광경로 변경수단을 구비한 편광변환조명기를 구성함으로써 전체시스템의 부피를 줄이며 생산원가를 낮출 수 있는 효과가 있다.An optical system for converting incident polarization components into identical polarization components and projecting them onto a liquid crystal panel, comprising: polarization separation means for separating incident light into vertical polarization components and parallel polarization components, and among the polarization components generated by the polarization separation means; Means for converting any one of the polarization components into another polarization component using optical activity, and a light path changing means for causing the same polarization component projected by the separating means and the conversion means to proceed to the liquid crystal panel. By constructing a conversion fixture, it is possible to reduce the volume of the entire system and to lower the production cost.
Description
제1도는 종래의 편광변환조명기를 나타내는 구성도.1 is a block diagram showing a conventional polarization conversion illuminator.
제2도는 본 발명에 따른 편광변환조명기의 일 실시예를 나타내는 구성도.2 is a block diagram showing an embodiment of a polarization conversion illuminator according to the present invention.
제3도는 본 발명에 따른 편광변환조명기의 다른 실시예를 나타내는 구성도.3 is a block diagram showing another embodiment of a polarization conversion illuminator according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 광원 11 : 편광프리즘10 light source 11 polarization prism
12 : 평광면 13 : 반사거울12: flat surface 13: reflection mirror
14 : 편광변환소자 15 : 편광판14 polarization converting element 15 polarizing plate
17 : 액정패널17: liquid crystal panel
본 발명은 편광변환조명기에 관한 것으로서, 특히 액정프로젝터처럼 광의 편광을 이용하는 광학시스템에서 편광변환소자를 사용한 편광변환조명기에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarization conversion illuminator, and more particularly, to a polarization conversion illuminator using a polarization conversion element in an optical system using polarization of light like a liquid crystal projector.
일반적으로 광변조에 사용하는 액정패널(LC Panel)에 편광Polarized Light)을 제공하기 위하여 편광변환조명기를 이용하고 있는데, 제1도는 종래의 편광변환조명기를 나타낸 것이다. 종래의 편광변환조명기는 입사하는 자연광이 편광프리즘(1)에 투사되면, 입사광선을 수직성분 및 평행성분의 편광으로 나누는 편광프리즘(1)에 의하여 두개의 편광이 발생한다. 즉, 평행편광은 두개의 프리즘을 접합시켜 구성한 편광프리즘(1)내부의 편광면에서 입사광이 반사하면서 발생하며,수직편광은 입사광이 편광프리즘(1)의 평관면을 투과하면서 발생한다. 편광프리즘(1)에서 생성되는 평행편광은 제1직각프리즘(2) 및 제2직각프리즘(3)을 통과하면서 광경로가 변경되어 합성용프리즘(4)에 투사된다. 또한, 편광프리즘(1)에서 생성되는 수직편광은 제3직각프리즘(5) 및 제4직각프리즘(6)을 통과하면서 광경로 및 편광성분이 변경되어 합성용프리즘(4)으로 투사된다. 즉, 제3직각프리즘(5)에서는 광경로만 변경되도록 설계되어 있고, 제4직각프리즘(6)에서는 광경로 및 편광성분이 함께 변하도록 설계되어 있다. 따라서, 편광프리즘(1)에서 생성된 수직평광은 제4직각프리즘(6)에서 평행편광으로 변환되어 합성용프리즘(4)에 입사된다. 합성용프리즘(4)에 입사하는 상기의 평행편광은 광경로가 보정되어 액정패널(7)로 투사된다.In general, a polarization conversion illuminator is used to provide a polarized polarized light to a liquid crystal panel (LC panel) used for optical modulation, and FIG. 1 shows a conventional polarization conversion illuminator. In the conventional polarization converting lighting device, when incident natural light is projected onto the polarizing prism 1, two polarizations are generated by the polarizing prism 1 which divides the incident light into polarized light of vertical and parallel components. That is, parallel polarization occurs when incident light is reflected from the polarization plane inside the polarizing prism 1 formed by joining two prisms, and vertical polarization occurs while incident light passes through the flat tube plane of the polarization prism 1. The parallel polarization generated by the polarizing prism 1 passes through the first rectangular prism 2 and the second rectangular prism 3 and changes its optical path and is projected onto the synthesizing prism 4. In addition, the vertically polarized light generated by the polarizing prism 1 passes through the third rectangular prism 5 and the fourth rectangular prism 6, and the optical path and polarization components are changed and projected onto the synthesizing prism 4. That is, the third rectangular prism 5 is designed to change only the optical path, and the fourth rectangular prism 6 is designed to change both the optical path and the polarization component. Accordingly, the vertical flat light generated in the polarizing prism 1 is converted into parallel polarized light in the fourth rectangular prism 6 and is incident on the synthesizing prism 4. The parallel polarized light incident on the synthesizing prism 4 is projected onto the liquid crystal panel 7 by correcting the optical path.
상기와 같은 종래의 편광변환조명기에서는, 다수의 직각프리즘을 사용함으로써 구조가 복잡해짐에 따라 생산원가가 상승하며 전체시스템이 부피가 커지는 문제점이 있었다.In the conventional polarization conversion lighting apparatus as described above, as the structure is complicated by using a plurality of rectangular prisms, the production cost increases and the entire system becomes bulky.
본 발명은 상기와 같은 문제점을 해결하기 위한 것으로서, 본 발명의 목적은 편광변환소자를 사용하여 전체시스템의 부피를 줄이며 생산원가를 낮출 수 있는 편광변환조명기를 제공함에 있다.The present invention has been made to solve the above problems, and an object of the present invention is to provide a polarization conversion illuminator that can reduce the volume of the entire system and lower the production cost by using a polarization conversion element.
상기와 같은 목적을 달성하기 위한 본 발명의 특징은, 입사광선의 평광성분들을 동일한 편광성분으로 변환하여 액정패널에 투사하는 광학시스템에 있어서, 입사광선을 수직편광성분과 평행편광성분으로 분리하는 편광분리수단과, 상기 편광분리수단에서 발생하는 편광성분중의 어느하나를 광학적 활성도(Optical Activity)를 이용하여 다른 편광성분으로 변환하는 수단과, 상기의 분리수단 및 변환수단에서 투사되는 동일한 편광성분이 액정패널로 진행하도록하는 광경로 변경수단을 구비한 편광변환조명기에 있다. 또한, 상기의 분리수단은 입사하는 광선을 수직편광성분과 평행편광성분으로 분리하는 편광프리즘 또는 편광판인 것을 특징으로 한다.A feature of the present invention for achieving the above object is, in an optical system for converting the flat light components of the incident light to the same polarized light component and projecting them on the liquid crystal panel, polarization for separating the incident light into a vertical polarized light component and a parallel polarized light component Means for converting any one of the separation means and the polarization components generated by the polarization separation means into another polarization component using optical activity, and the same polarization component projected by the separation means and conversion means There is a polarization conversion lighting device having a light path changing means for proceeding to the liquid crystal panel. In addition, the separating means is characterized in that the polarizing prism or polarizing plate for separating the incident light rays into a vertical polarization component and a parallel polarization component.
이하 본 발명에 따른 편광변환조명기의 바람직한 일 실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, a preferred embodiment of a polarization conversion lighting apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
제2도는 본 발명의 일 실시에에 따른 편광변환조명기의 구성도로서, 편광성분들을 분리하는 편광프리즘(11)과, 광경로를 변경하는 반사거울(13)과, 편광변환소자(14)로 구성된다. 광원(10)에서 투사하는 백색광이라고도 불리는 자연광이 편광프리즘(11)에 입사하면, 입사광의 한 편광성분은 편광프리즘(11)의 편광면(12)에서 반사하고, 입사광의 다른 한 편광성분은 편광프리즘(11)의 편광면(12)을 투과한다. 여기서, 반사하는 광을 평행편광이라 하고 투과하는 광을 수직편광이라고 한다. 상술의 편광프리즘(11)에서 생성되는 평행현광은 반사거울(13)에서 반사되어 편광변환소자(14)로 투사된다. 편광변환소자(14)는 운모(Mic)등의 소재로 만들어진 것으로 광학적 활성도(Optical Activity)를 이용하여 입사하는 수직편광을 평행편광으로 또는 입사하는 평행편광을 수직편광으로 변형한다. 따라서, 편광변환소자(14)에 입사한 평행편광은 수직편광으로 바꾸어진다. 또한, 편광면(12)을 투과하는 수직편광은 편광성분의 변형없이 편광프리즘(11)에서 투사되어 나온다. 상술의 편광프리즘(11)과 편광변환소자(14)에서 투사되어 나오는 수직편광의 광선은 액정패널(17)에 투사되고, 또한 액정패널(17)에 의해 광변조된다.2 is a block diagram of a polarization conversion lighting apparatus according to an embodiment of the present invention, comprising a polarizing prism 11 for separating polarization components, a reflective mirror 13 for changing an optical path, and a polarization conversion element 14. It is composed. When natural light, also called white light, projected from the light source 10 is incident on the polarizing prism 11, one polarized component of the incident light is reflected at the polarization plane 12 of the polarized prism 11, and the other polarized component of the incident light is polarized. The polarization plane 12 of the prism 11 is transmitted. Here, reflected light is called parallel polarized light and transmitted light is called vertical polarized light. Parallel light generated by the above-described polarizing prism 11 is reflected by the reflecting mirror 13 and is projected onto the polarization converting element 14. The polarization conversion element 14 is made of a material such as mica (Mic), and transforms the incident vertical polarized light into parallel polarized light or the incident parallel polarized light into vertical polarized light using optical activity. Therefore, the parallel polarized light incident on the polarization converting element 14 is changed to vertical polarized light. In addition, the vertically polarized light transmitted through the polarization plane 12 is projected from the polarization prism 11 without deformation of the polarization component. The vertically polarized light beams projected from the above-described polarization prism 11 and the polarization conversion element 14 are projected onto the liquid crystal panel 17, and are further modulated by the liquid crystal panel 17.
요약하면 제2도는, 편광분리수단(편광프리즘;11)으로부터의 평행편광성분의 광경로를 반사거울(13)에 의해 변경한후, 수직편광성분으로 변환하여 액정패널(17)로 투사하는 경우의 바람직한 일실시예를 보인 것이다.In summary, FIG. 2 shows a case in which the optical path of the parallel polarization component from the polarization separating means (polarization prism) 11 is changed by the reflection mirror 13, and then converted into a vertical polarization component and projected onto the liquid crystal panel 17. FIG. One preferred embodiment of the will be shown.
한편 도시하지는 않았지만, 분리된 수직편광성분의 광경로를 변경한후 평행편광성분으로 변환하여 액정패널로 투사하는 경우의 다른 실시예를, 당업자라면 본 발명의 목적 및 기술요지에 근거하여 제2도구성들의 결합관계를 변형하므로써 용이하게 구현할 수 있으므로 상세히 기술하지 않기로 한다. 다만, 그 구성들의 결합관계를 간략히 살펴보면, 편광분리수단(11,15)으로부터의 분리된 평행편광성분은 액정패널(17)로 곧바로 투사될 수 있도록 액정패널이 배치되며, 편광분리수단(11,15)으로부터의 분리된 수직편광성분은 광경로변경수단인 반사거울(13)에 의해 경로변경된후 편광변환소자(14)에 의해 평행편광성분으로 변환되어 액정패널(17)에 투사되도록 구성하면 된다.On the other hand, although not shown, another embodiment of the case of changing the optical path of the separated vertical polarization component and converting it into a parallel polarization component and projecting it to the liquid crystal panel, a person skilled in the art based on the object and technical spirit of the present invention a second tool Since it can be easily implemented by modifying the relationship of the sexes will not be described in detail. However, briefly looking at the coupling relationship of the components, the liquid crystal panel is arranged so that the parallel polarization component separated from the polarization separation means 11, 15 can be directly projected onto the liquid crystal panel 17, and the polarization separation means 11, The separated vertically polarized light component from 15 may be converted to a parallel polarized light component by the polarization converting element 14 after being redirected by the reflective mirror 13, which is an optical path changing means, to be projected onto the liquid crystal panel 17. .
제3도는 본 발명의 다른 일 실시예에 따른 편광변환조명기의 구성도로서, 상기 제1실시예의 편광프리즘(11)을 편광판(15)에 도달하면, 편광판(15)에서 반사하면서 평행편광이 생성되며 편광판(15)을 투과하면서 수직편광이 발생한다. 이후의 과정은 상술의 제1실시에에서 편광성분이 바뀌며 액정패널(17)에 투사되는 과정과 동일하다.3 is a block diagram of a polarization conversion lighting apparatus according to another embodiment of the present invention. When the polarizing prism 11 of the first embodiment reaches the polarizing plate 15, parallel polarization is generated while reflecting from the polarizing plate 15. And vertical polarization is generated while passing through the polarizing plate (15). The subsequent process is the same as the process of changing the polarization component and projecting onto the liquid crystal panel 17 in the above-described first embodiment.
상기와 같은 본 발명에 따른 편광변환조명기에 의하면, 광학적 활성도(Optical Activity)를 이용하는 편광변환소자를 사용하여 전체시스템의 부피를 줄이며 생산원가를 낮출 수 있는 효과가 있다.According to the polarization conversion lighting apparatus according to the present invention as described above, by using a polarization conversion device using an optical activity (Optical Activity) has the effect of reducing the volume of the entire system and lower the production cost.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019920008364A KR0178710B1 (en) | 1992-05-18 | 1992-05-18 | Polarized light illuminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019920008364A KR0178710B1 (en) | 1992-05-18 | 1992-05-18 | Polarized light illuminator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR930023742A KR930023742A (en) | 1993-12-21 |
| KR0178710B1 true KR0178710B1 (en) | 1999-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019920008364A KR0178710B1 (en) | 1992-05-18 | 1992-05-18 | Polarized light illuminator |
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| KR (1) | KR0178710B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6822857B2 (en) | 2002-07-16 | 2004-11-23 | Samsung Electronics Co., Ltd. | Monitor improved in a tilting structure |
-
1992
- 1992-05-18 KR KR1019920008364A patent/KR0178710B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6822857B2 (en) | 2002-07-16 | 2004-11-23 | Samsung Electronics Co., Ltd. | Monitor improved in a tilting structure |
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| Publication number | Publication date |
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| KR930023742A (en) | 1993-12-21 |
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