JP2874163B2 - Polarized light source, liquid crystal display device and projection display device - Google Patents
Polarized light source, liquid crystal display device and projection display deviceInfo
- Publication number
- JP2874163B2 JP2874163B2 JP63222613A JP22261388A JP2874163B2 JP 2874163 B2 JP2874163 B2 JP 2874163B2 JP 63222613 A JP63222613 A JP 63222613A JP 22261388 A JP22261388 A JP 22261388A JP 2874163 B2 JP2874163 B2 JP 2874163B2
- Authority
- JP
- Japan
- Prior art keywords
- polarized light
- light source
- display device
- liquid crystal
- emitted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、液晶表示装置の背部光源、投射型表示装置
の光源、光弾性実験等の偏光が利用される機器及びその
応用製品の光源に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back light source of a liquid crystal display device, a light source of a projection display device, a device using polarized light such as a photoelasticity experiment, and a light source of an applied product thereof. .
従来の偏光光源は、第３図に示すように、ランプ出射
光をリフレクターやレンズ系で集光した後に、フィルム
状の偏光板により透過光の偏光を利用する光学系であっ
た。As shown in FIG. 3, a conventional polarized light source is an optical system that uses the polarization of transmitted light by a film-shaped polarizing plate after condensing light emitted from a lamp by a reflector or a lens system.
しかし、前述の従来技術では、偏光板が、不要な偏光
方向の光を半分吸収し、偏光板自身の透過率も80％程度
で、光が減衰し、出射偏光光束が著しく少なく、ランプ
から出射される光束が有効に偏光光束として利用され
ず、明るさが十分に得られないという問題点を有する。However, in the above-mentioned conventional technology, the polarizing plate absorbs half of the light in the unnecessary polarization direction, the transmittance of the polarizing plate itself is about 80%, the light is attenuated, the output polarized light flux is extremely small, and the light emitted from the lamp is emitted. However, there is a problem that the luminous flux to be emitted is not effectively used as a polarized luminous flux, so that sufficient brightness cannot be obtained.
そこで、本発明は、このような問題点を解決するもの
で、その目的とするところは、ランプからの出射光束を
有効に偏光光束にし、明るい偏光光源及びそれを用いて
なる液晶表示装置及び投射型表示装置を提供するところ
にある。Therefore, the present invention solves such a problem, and an object of the present invention is to effectively convert a light beam emitted from a lamp into a polarized light beam, to provide a bright polarized light source, a liquid crystal display device using the same, and a projection device. To provide a type display device.
本発明の偏光光源は、光源と、前記光源から出射され
た光束を、互いに偏光方向が異なる２つの偏光光束に分
離して、互いに異なる方向へ出射する偏光分離手段と、
一方の前記偏光光束と他方の前記偏光光束の偏光方向と
を揃える半波長板と、前記偏光分離手段によって分離さ
れた前記偏光光束のそれぞれを反射して、並列に隙間な
く出射させる複数の反射鏡と、を備え、前記複数の反射
鏡によって前記一方の偏光光束が反射される回数と、前
記複数の反射鏡によって前記他方の偏光光束が反射され
る回数とが、等しいことを特徴とする。The polarized light source of the present invention comprises: a light source; a polarized light separating unit that separates a light beam emitted from the light source into two polarized light beams having different polarization directions, and emits the light beams in different directions.
A half-wave plate for aligning the polarization directions of the one polarized light beam and the other polarized light beam, and a plurality of reflecting mirrors for reflecting each of the polarized light beams separated by the polarization separating means and emitting them in parallel without gaps Wherein the number of times the one polarized light beam is reflected by the plurality of reflecting mirrors is equal to the number of times the other polarized light beam is reflected by the plurality of reflecting mirrors.
本発明の液晶表示装置は、上記の偏光光源と、前記偏
光光源から出射された光を入射する液晶シャッターとを
有することを特徴とする。A liquid crystal display device according to the present invention includes the polarized light source described above and a liquid crystal shutter that receives light emitted from the polarized light source.
本発明の投射型表示装置は、上記の偏光光源と、前記
偏光光源から出射された光を入射する液晶シャッターと
を有することを特徴とする。A projection display apparatus according to the present invention includes the above-mentioned polarized light source, and a liquid crystal shutter that receives light emitted from the polarized light source.
本発明の上記の構成によれば、ビームスプリッターで
はほとんどの光が損失なく、互いに直交する直線偏光と
なる。次にその片方の光束を半波長板を透過することに
より偏光方向が他方と同一方向になる。このときの透過
損失はわずかにすることができる。これらの損失の少な
い偏光光束を反射鏡で略同一方向へ平行出射するとき全
反射に近い状態にすれば、反射損失はわずかなものとな
り、ランプの光束のほとんどを損失少なく偏光光束にす
ることができる。According to the above configuration of the present invention, most of the light in the beam splitter is linearly polarized light orthogonal to each other without any loss. Next, one of the light beams is transmitted through the half-wave plate so that the polarization direction becomes the same as the other. The transmission loss at this time can be made small. When these polarized light beams with small loss are emitted in parallel in substantially the same direction by a reflecting mirror, if the state is close to total reflection, the reflection loss will be very small, and most of the lamp light beam can be converted into a polarized light beam with little loss. it can.
第１図は、本発明における主要平面図であってランプ
１より出射された光は、リフレクター２によって略平行
光束とする。このとき光束は自然偏光光束である。次
に、この光束をビームスプリッター３で、反射光をＳ偏
光に、透過光をＰ偏光に分離し、本実施例においては、
反射光Ｓを反射鏡５で方向を変えて半波長板６を通過さ
せて、偏光軸を90゜回転させ、透過光Ｓと同一方向と
し、反射鏡７により両光束を略平行に、同一方向の偏光
として並列に出射することができる。このとき半波長板
を反射鏡５の前段に配しても同等の効果が得られる。又
半波長板を反射鏡４の前段又は後段に配すると偏光方向
の異なる、やはり同一偏光の並列出射光束を得ることが
できる。FIG. 1 is a main plan view of the present invention, in which light emitted from a lamp 1 is converted into a substantially parallel light beam by a reflector 2. At this time, the light beam is a naturally polarized light beam. Next, this beam is separated by a beam splitter 3 into reflected light into S-polarized light and transmitted light into P-polarized light.
The direction of the reflected light S is changed by the reflecting mirror 5 to pass through the half-wave plate 6 and the polarization axis is rotated by 90 ° so that the reflected light S has the same direction as the transmitted light S. And emitted in parallel as polarized light. At this time, the same effect can be obtained even if the half-wave plate is arranged before the reflecting mirror 5. If the half-wave plate is arranged before or after the reflecting mirror 4, parallel emitted light beams having different polarization directions and also having the same polarization can be obtained.
第２図は、本発明の参考例の主要平面図であって、構
成思想は同一であるが、反射鏡の段数を減らし、Ｓ、Ｐ
各偏光とも１回反射で構成する実施例で、反射回数が少
ない分だけ反射損失が減り、より明るい偏光光源が得ら
れる。FIG. 2 is a main plan view of a reference example of the present invention, which has the same configuration concept, but reduces the number of stages of the reflecting mirror, and
In this embodiment, each polarized light is configured to be reflected once. The reflection loss is reduced by the smaller number of times of reflection, and a brighter polarized light source can be obtained.
以上に述べたように、発明によれば、ランプの出射光
束の損失が少なく、利用率の高い、従来に比して非常に
明るい偏光光源が得られ、しかもその光束は平行性の高
い性質であるので、例えば液晶の視覚依存性の悪影響の
ない表示や、遠距離への伝達や、テレセントリックレン
ズとのマッチングが良い等のすぐれた性質の明るい偏光
光源であるという効果を有する。また、以上の効果を享
受した液晶表示装置及び投射型表示装置を提供すること
が出来る。As described above, according to the present invention, it is possible to obtain a polarized light source with a small loss of light emitted from the lamp, a high utilization factor, and an extremely bright light as compared with the conventional light source. Therefore, there is an effect that the display is a bright polarized light source having excellent properties such as display without adverse effect of visual dependency of liquid crystal, transmission to a long distance, and good matching with a telecentric lens. Further, it is possible to provide a liquid crystal display device and a projection display device that have enjoyed the above effects.
第１図は、本発明の偏光光源の実施例を示す主要平面
図。 第２図は、本発明の偏光光源の参考例を示す主要平面
図。 第３図は、従来の偏光光源を示す主要平面図。 １、21、31……ランプ ２、22、32……リフレクター ３、23……ビームスプリッター ４、５、７、23、24、25……反射鏡 ６、26……半波長板（1/2波長板） 39……偏光板FIG. 1 is a main plan view showing an embodiment of a polarized light source according to the present invention. FIG. 2 is a main plan view showing a reference example of the polarized light source of the present invention. FIG. 3 is a main plan view showing a conventional polarized light source. 1, 21, 31 ... lamp 2, 22, 32 ... reflector 3, 23 ... beam splitter 4, 5, 7, 23, 24, 25 ... reflecting mirror 6, 26 ... half-wave plate (1/2 Wave plate) 39 ... Polarizing plate
Claims (3)
る２つの偏光光束に分離して、互いに異なる方向へ出射
する偏光分離手段と、 一方の前記偏光光束と他方の前記偏光光束の偏光方向と
を揃える半波長板と、 前記偏光分離手段によって分離された前記偏光光束のそ
れぞれを反射して、並列に隙間なく出射させる複数の反
射鏡と、を備え、 前記複数の反射鏡によって前記一方の偏光光束が反射さ
れる回数と、前記複数の反射鏡によって前記他方の偏光
光束が反射される回数とが、等しいことを特徴とする偏
光光源。A light source; a light beam emitted from the light source; polarized light separating means for separating light beams emitted from the light source into two polarized light beams having different polarization directions, and emitting the polarized light beams in mutually different directions; A half-wave plate that aligns the polarization direction of the polarized light beam, and a plurality of reflecting mirrors that reflect each of the polarized light beams separated by the polarization separating unit and emit the light in parallel without gaps, A polarized light source, wherein the number of times the one polarized light beam is reflected by a reflecting mirror is equal to the number of times the other polarized light beam is reflected by the plurality of reflecting mirrors.
ーとを有することを特徴とする液晶表示装置。2. A liquid crystal display device comprising: the polarized light source according to claim 1; and a liquid crystal shutter that receives light emitted from the polarized light source.
ーとを有することを特徴とする投射型表示装置。3. A projection type display device comprising: the polarized light source according to claim 1; and a liquid crystal shutter for receiving light emitted from the polarized light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63222613A JP2874163B2 (en) | 1988-09-06 | 1988-09-06 | Polarized light source, liquid crystal display device and projection display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63222613A JP2874163B2 (en) | 1988-09-06 | 1988-09-06 | Polarized light source, liquid crystal display device and projection display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0269715A JPH0269715A (en) | 1990-03-08 |
| JP2874163B2 true JP2874163B2 (en) | 1999-03-24 |
Family
ID=16785199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63222613A Expired - Lifetime JP2874163B2 (en) | 1988-09-06 | 1988-09-06 | Polarized light source, liquid crystal display device and projection display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2874163B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2893599B2 (en) * | 1989-10-05 | 1999-05-24 | セイコーエプソン株式会社 | Polarized light source and projection display |
| JPH0830790B2 (en) * | 1990-05-18 | 1996-03-27 | 日本ビクター株式会社 | Polarization conversion optical system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0769539B2 (en) * | 1986-11-12 | 1995-07-31 | 株式会社日立製作所 | Liquid crystal display |
-
1988
- 1988-09-06 JP JP63222613A patent/JP2874163B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0269715A (en) | 1990-03-08 |
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