JPH0375620A - Reflection type display device - Google Patents
Reflection type display deviceInfo
- Publication number
- JPH0375620A JPH0375620A JP1211248A JP21124889A JPH0375620A JP H0375620 A JPH0375620 A JP H0375620A JP 1211248 A JP1211248 A JP 1211248A JP 21124889 A JP21124889 A JP 21124889A JP H0375620 A JPH0375620 A JP H0375620A
- Authority
- JP
- Japan
- Prior art keywords
- light
- polarized light
- phase difference
- polarized
- display device
- 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.)
- Granted
Links
- 230000010287 polarization Effects 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 229940125730 polarisation modulator Drugs 0.000 claims description 6
- 239000004973 liquid crystal related substance Substances 0.000 claims description 5
- 230000005684 electric field Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 244000171726 Scotch broom Species 0.000 description 1
- 206010041662 Splinter Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
グロジヱクションテレビ用の表示装置としては、ＣＲＴ
投射管や透過型の液晶ライトパルプ等が用Ｌ・られてい
る。特に液晶ライトバルブ型はＣＲＴを用いたグロジェ
クターと比べ、小型、軽量、低コスト、操作性容易等の
長所を有している。反射型の表示素子を使ったプロジェ
クタ−はまだ実用化されていないが、今後実用化が期待
される。本発明はプロジェクタ−等に応用可能な反射型
表示装置に関する。[Detailed Description of the Invention] [Industrial Application Field] CRT is used as a display device for grosgection television.
Projection tubes and transmission type liquid crystal light pulp are used. In particular, the liquid crystal light valve type has the advantages of being smaller, lighter, lower cost, and easier to operate than a glow projector using a CRT. Although projectors using reflective display elements have not yet been put into practical use, it is expected that they will be put into practical use in the future. The present invention relates to a reflective display device applicable to projectors and the like.
第３図はカラー液晶プロジェクタ−用に提案されている
反射型表示装置の従来例である。第１の偏光１と第２の
偏光２は偏光ビームスプリッタ−７に入射し、第２の偏
光は除かれ、第１の偏光のみが第１の色分離ミラー４５
に入射し第１の偏光の第１の原色４６が第１原色用の反
射型偏光変調素子４１に入射し変調される。第１の原色
以外は第２の色分離ミラー４４に入射し、第１の偏光の
第２の原色４７が第２原色用の反射型偏光変調素子４２
に入射、第１の偏光の第３の原色４８が第３原色用の反
射型偏光変調素子４６に入射し、それぞれ変調される。FIG. 3 shows a conventional example of a reflective display device proposed for a color liquid crystal projector. The first polarized light 1 and the second polarized light 2 enter the polarizing beam splitter 7, the second polarized light is removed, and only the first polarized light is sent to the first color separation mirror 45.
The first primary color 46 of the first polarized light enters the reflective polarization modulation element 41 for the first primary color and is modulated. Light other than the first primary color enters the second color separation mirror 44, and the second primary color 47 of the first polarized light enters the reflective polarization modulation element 42 for the second primary color.
The third primary color 48 of the first polarized light enters the reflective polarization modulation element 46 for the third primary color and is modulated.
これらの３つの原色の変調光は色分離□ジー４４．４５
で合成され、偏光ビームスプリッタ−７で入射光とは異
なる角度に第１の偏光の変調光３として出射される。第
１の偏光の非変調光は破線５の如く元の経路を逆進し、
入射光方向に戻る。The modulated light of these three primary colors is color separated □G44.45
The polarized beam splitter 7 emits the first polarized modulated light 3 at a different angle from that of the incident light. The unmodulated light of the first polarization travels backward along the original path as shown by the broken line 5,
Return to the direction of the incident light.
従来例の欠点は光の利用効率が低い点にある。 The drawback of the conventional example is that the light utilization efficiency is low.
第３図の如く第２の偏光２は全く利用していない。As shown in FIG. 3, the second polarized light 2 is not used at all.
更に第１の偏光の非変調光も全く利用していない。Furthermore, the unmodulated light of the first polarization is not utilized at all.
プロジェクタ−では光の利用効率が非常に重要であり、
従来例では非常に大きな光源が必要となる。Light usage efficiency is very important for projectors.
The conventional example requires a very large light source.
本発明は上記の問題に鑑み、従来例で利用していなかっ
た第２の偏光を利用するのみでなく、第１の偏光の非変
調光をも利用する反射型表示装置を提供する。本発明の
光学系には積極的な光吸収素子が存在せず、光源の光の
大半を利用する事が可能となる。In view of the above problems, the present invention provides a reflective display device that not only uses the second polarized light, which was not used in the conventional example, but also uses unmodulated light of the first polarized light. The optical system of the present invention does not include any active light absorption element, making it possible to utilize most of the light from the light source.
本発明の構成は、光源と、光源からの入射光の第１の偏
光と第２の偏光を分離する偏光ビームスプリッタ−と、
該偏光ビームスプリッタ−で分離された第１の偏光或は
第２の偏光の少なくとも一方の光路上に配置された反射
型偏光変調素子とを有する反射型表示装置に於て、光源
の背後の反射面と偏光ビームスプリッタ−の間に、第１
の偏光と第２の偏光の間に位相差を生ぜしめる位相差素
子を配置する事を特徴としている。The configuration of the present invention includes a light source, a polarizing beam splitter that separates first polarized light and second polarized light of incident light from the light source,
In a reflective display device having a reflective polarization modulation element disposed on the optical path of at least one of the first polarized light and the second polarized light separated by the polarizing beam splitter, the reflection behind the light source Between the plane and the polarizing beam splitter, the first
It is characterized by arranging a retardation element that generates a phase difference between the polarized light and the second polarized light.
以下、図面により本発明の説明を行う。第１図は本発明
の反射型表示装置の第１の実施例である。The present invention will be explained below with reference to the drawings. FIG. 1 shows a first embodiment of a reflective display device of the present invention.
装置は光変調部１４と光源部１５に大別される。The device is roughly divided into a light modulation section 14 and a light source section 15.
光変調部１４では、入射光である第１の偏光１と第２の
偏光２が偏光ビームスプリッタ−７に入射し、該偏光ビ
ームスプリッタ−７で分離された第１の偏光１は、その
光路上に配置された第１の反射型偏光変調素子８に入射
し、偏光変調される。In the light modulation unit 14, the first polarized light 1 and the second polarized light 2, which are incident lights, enter the polarizing beam splitter 7, and the first polarized light 1 separated by the polarizing beam splitter 7 is The light enters the first reflective polarization modulation element 8 placed on the road and is polarized.
偏光ビームスプリッタ−７で分離された第２の偏光２は
、その光路上に配置された第２の反射型偏光変調素子９
によって偏光変調される。それぞれの変調光は偏光ビー
ムスプリッタ−７によって合成され、入射光とは異なる
角度に第１の偏光の変調光３及び第２の偏光の変調光４
として出射する。The second polarized light 2 separated by the polarizing beam splitter 7 passes through a second reflective polarization modulation element 9 disposed on its optical path.
The polarization is modulated by The respective modulated lights are combined by a polarization beam splitter 7, and the modulated light 3 of the first polarization and the modulated light 4 of the second polarization are separated at different angles from the incident light.
It emits as.
出射光はレンズで集められ、スクリーンに投影される。The emitted light is collected by a lens and projected onto a screen.
本発明では上記第１、第２の反射型偏光変調素子のどち
らか一方、例えば第２の反射型偏光変調素子は反射板で
置き換える事が可能である。従来例では第２の偏光は捨
てていたが、本発明の構成をとれば、第２の偏光の光路
上に反射板を設けて第２の偏光を非変調光６として光源
側に戻す事により、第２の偏光も利用できる。In the present invention, one of the first and second reflective polarization modulators, for example, the second reflective polarization modulator, can be replaced with a reflector. In the conventional example, the second polarized light was discarded, but with the configuration of the present invention, a reflector is provided on the optical path of the second polarized light and the second polarized light is returned to the light source side as unmodulated light 6. , a second polarization can also be used.
本発明の特徴である光源部１５は、光源１１と、その背
後に設けられた反射面１６と、反射面１６上に設けられ
た位相差素子１２と、レンズ１０からなる。光変調部１
４から戻ってきた第１の偏光の非変調光５、及び第２の
偏光の非変調光６は、レンズ１０を通過し、位相差素子
１２−反射面１６−位相差素子１２と通過し、再び光変
調部１４に入射する。ここで位相差素子とは第１の偏光
と第２の偏光の間の位相差を与える素子であり、光源１
０の光の波長に対し約４分のｔａ長の光路位相差を与え
る素子とすると、位相差素子１２−反射面１６−位相差
素子１２と通過する事により、偏光面がほぼ９０度回転
する。よって本発明では、光源側に戻された第１の偏光
の非変調光は第２の偏光として、第２の偏光の非変調光
は第１の偏光として再び光変調部１４に入射し、表示に
利用される。The light source section 15, which is a feature of the present invention, includes a light source 11, a reflective surface 16 provided behind the light source 11, a retardation element 12 provided on the reflective surface 16, and a lens 10. Light modulation section 1
The first polarized non-modulated light 5 and the second polarized non-modulated light 6 returned from 4 pass through the lens 10, phase difference element 12-reflection surface 16-phase difference element 12, The light enters the light modulation section 14 again. Here, the phase difference element is an element that provides a phase difference between the first polarized light and the second polarized light, and is an element that provides a phase difference between the first polarized light and the second polarized light.
Assuming that the element provides an optical path phase difference of approximately 4 minutes ta length for the wavelength of light of 0, the plane of polarization rotates approximately 90 degrees by passing through the phase difference element 12 - reflection surface 16 - phase difference element 12. . Therefore, in the present invention, the first polarized non-modulated light returned to the light source side enters the light modulating section 14 again as the second polarized light, and the second polarized non-modulated light enters the light modulating section 14 as the first polarized light. used for.
本発明の構成を用いれば、前述のように片方の、例えば
第２の偏光の光路上に反射板を設けた場合、戻ってきた
第２の偏光の非変調光は第１の偏光に変換され、今度は
第１の偏光の光路上に設けられた反射型偏光変調素子に
よって表示に利用される。If the configuration of the present invention is used, as described above, if a reflector is provided on one of the optical paths of the second polarized light, for example, the returned unmodulated light of the second polarized light will be converted into the first polarized light. , which is then used for display by a reflective polarization modulation element provided on the optical path of the first polarized light.
もちろん、この反射型偏光変調素子によって変調されな
かった第１の偏光の非変調光も再び光源部１５に戻され
最後には利用される。Of course, the unmodulated light of the first polarization that was not modulated by the reflective polarization modulator is also returned to the light source section 15 and finally used.
第２図は本発明の第２の実施例である。本実施例では位
相差素子１２が光源１１と反射面１６０間ではなく、光
源１１と偏光ビームスプリッタ−７の間に設けられてい
る。動作は第１の実施例とほぼ同様である。FIG. 2 shows a second embodiment of the invention. In this embodiment, the phase difference element 12 is provided not between the light source 11 and the reflective surface 160 but between the light source 11 and the polarizing beam splitter 7. The operation is almost the same as the first embodiment.
以上の説明で明らかな如く、本発明は光の殆どを利用で
きるという従来にない高効率の表示装置を可能とし、本
発明を用いれば極めて高性能のプロジェクタ−等を提供
し得る。As is clear from the above description, the present invention enables an unprecedentedly highly efficient display device that can utilize most of the light, and by using the present invention, extremely high performance projectors and the like can be provided.
第１図、第２図は本発明の反射型表示装置の実施例を示
す説明図、第３図は従来の反射型表示装置の一例を示す
説明図である。
１・・・・・・第１の偏光、
２・・・・・・第２の偏光、
３・・・・・・第１の偏光の変調光、
４・・・・・・第２の偏光の変調光、
５・・・・・・第１の偏光の非変調光、６・・・・・・
第２の偏光の非変調光、７・・・・・・偏光ビームスプ
リンター８・・・・・・反射型偏光変調素子、
１１・・・・・・光源、
１２・・・・・・位相差素子、
１６・・・・・・反射面。
箒１日1 and 2 are explanatory diagrams showing an embodiment of a reflective display device of the present invention, and FIG. 3 is an explanatory diagram showing an example of a conventional reflective display device. 1...First polarized light, 2...Second polarized light, 3...Modulated light of first polarized light, 4...Second polarized light Modulated light of 5... First polarized non-modulated light, 6...
Second polarized non-modulated light, 7... Polarization beam splinter 8... Reflective polarization modulation element, 11... Light source, 12... Phase difference Element, 16... Reflective surface. Broom for 1 day
Claims (5)
偏光を分離する偏光ビームスプリッターと、該偏光ビー
ムスプリッターで分離された第１の偏光或は第２の偏光
の少なくとも一方の光路上に配置された反射型偏光変調
素子とを有する反射型表示装置に於て、光源の背後に反
射面を設け、該反射面と偏光ビームスプリッターの間に
、第１の偏光と第２の偏光の間に位相差を生ぜしめる位
相差素子を配置してなる反射型表示装置。(1) A light source, a polarizing beam splitter that separates the first polarized light and the second polarized light of the incident light from the light source, and at least one of the first polarized light or the second polarized light separated by the polarized beam splitter. In a reflective display device having a reflective polarization modulation element disposed on the optical path of A reflective display device comprising a retardation element that creates a phase difference between polarized light.
事を特徴とする請求項１に記載の反射型表示装置。(2) The reflective display device according to claim 1, wherein the retardation element is provided between the light source and the reflective surface.
間に設けられている事を特徴とする請求項１に記載の反
射型表示装置。(3) The reflective display device according to claim 1, wherein the phase difference element is provided between the light source and the polarizing beam splitter.
設けた請求項１に記載の反射型表示装置に対し、第２の
偏光の光路上に反射板を設けた事を特徴とする反射型表
示装置。(4) The reflective display device according to claim 1, in which the reflective polarization modulator is provided only on the optical path of the first polarized light, is further characterized in that a reflective plate is provided on the optical path of the second polarized light. reflective display device.
してなる液晶反射型偏光変調素子である事を特徴とする
請求項１に記載の反射型表示装置。(5) The reflective display device according to claim 1, wherein the reflective polarization modulator is a liquid crystal reflective polarization modulator in which birefringence of liquid crystal is controlled by an electric field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01211248A JP3086463B2 (en) | 1989-08-18 | 1989-08-18 | Reflective display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01211248A JP3086463B2 (en) | 1989-08-18 | 1989-08-18 | Reflective display |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000123414A Division JP3207408B2 (en) | 1989-08-18 | 2000-04-25 | Reflective display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0375620A true JPH0375620A (en) | 1991-03-29 |
| JP3086463B2 JP3086463B2 (en) | 2000-09-11 |
Family
ID=16602755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01211248A Expired - Fee Related JP3086463B2 (en) | 1989-08-18 | 1989-08-18 | Reflective display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3086463B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0615148A2 (en) * | 1993-03-08 | 1994-09-14 | Ernst Prof. Dr.-Ing. habil. Lüder | Method and device for the polarization of light |
-
1989
- 1989-08-18 JP JP01211248A patent/JP3086463B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0615148A2 (en) * | 1993-03-08 | 1994-09-14 | Ernst Prof. Dr.-Ing. habil. Lüder | Method and device for the polarization of light |
| EP0615148A3 (en) * | 1993-03-08 | 1995-06-28 | Lueder Ernst | Method and device for the polarization of light. |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3086463B2 (en) | 2000-09-11 |
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