JPH03152523A - Liquid crystal projector - Google Patents
Liquid crystal projectorInfo
- Publication number
- JPH03152523A JPH03152523A JP1291710A JP29171089A JPH03152523A JP H03152523 A JPH03152523 A JP H03152523A JP 1291710 A JP1291710 A JP 1291710A JP 29171089 A JP29171089 A JP 29171089A JP H03152523 A JPH03152523 A JP H03152523A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- crystal panel
- polarizing filter
- waves
- 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.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 36
- 230000010287 polarization Effects 0.000 claims abstract description 13
- 230000002194 synthesizing effect Effects 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract 1
- 239000003381 stabilizer Substances 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
この発明は、液晶パネルの画像をスクリーンに拡大投映
する液晶プロジェクタ−に間し、特に、光源から発せら
れた光を光学的に処理して、有効に利用するようにした
液晶プロジェクタ−に関する。Detailed Description of the Invention "Field of Industrial Application" This invention relates to a liquid crystal projector that enlarges and projects an image on a liquid crystal panel onto a screen, and in particular optically processes light emitted from a light source. This invention relates to a liquid crystal projector that can be used effectively.
「従来の技術」
従来、液晶プロジェクタ−の光学系は、第２図で示すよ
うにリフレクタ−１付の光源ランプ２と、反射ミラー４
と、コンデンサレンズ９と、入光側の偏光フィルタ１０
と、映像ソースの液晶パネル１１と、出光側の偏光フィ
ルタ１２及び投写レンズ１３とから構成されている。``Prior Art'' Conventionally, the optical system of a liquid crystal projector consists of a light source lamp 2 with a reflector 1 and a reflecting mirror 4, as shown in FIG.
, a condenser lens 9, and a polarizing filter 10 on the light input side.
, a liquid crystal panel 11 as a video source, a polarizing filter 12 on the light output side, and a projection lens 13.
そして、光源ランプ２から発せられる光及びリフレクタ
−１で反射された光は、反射ミラー４で反射されてコン
デンサレンズ９に入光し、集光される。The light emitted from the light source lamp 2 and the light reflected by the reflector 1 are reflected by the reflection mirror 4, enter the condenser lens 9, and are condensed.
コンデンサレンズ９で集光された光は、入光側の偏光フ
ィルタｌＯを通った後に、映像ソースである液晶パネル
１１を通り、さらに、出光側の偏光フィルタ１２を通っ
て再生される映像を透過する。The light collected by the condenser lens 9 passes through the polarizing filter IO on the light input side, passes through the liquid crystal panel 11 which is the video source, and then passes through the polarizing filter 12 on the light output side to transmit the reproduced image. do.
偏光フィルタ１２を通った映像の光は、投写レンズ１３
に入光し、投写レンズ１３によって拡大されスクリーン
（図示しない）上に投映される。The image light that has passed through the polarizing filter 12 is transmitted to the projection lens 13.
The light enters the field, is magnified by the projection lens 13, and is projected onto a screen (not shown).
「発明が解決しようとする課題」
従来の技術で述べたように、液晶パネル１１を使用して
スクリーンに拡大投映する場合には、液晶パネル１１を
挟んで入光側と出光側に偏光フィルタ１０．１２が配設
されている。"Problems to be Solved by the Invention" As described in the prior art, when using the liquid crystal panel 11 to project an enlarged image onto a screen, polarizing filters 10 are placed on the light input side and the light output side with the liquid crystal panel 11 in between. .12 is installed.
しかしながら、入光側の偏光フィルタ１０において、偏
光面と９０度の位相差の光は、偏光フィルタ１０で遮断
されるので、光源ランプ２及びリフレクタ−１からの光
が５０％遮断される結果となり、ロスが大きいと共に、
遮断された光が偏光フィルタｌＯに吸収されて偏光フィ
ルタｌＯを発熱させることになる。However, in the polarizing filter 10 on the light input side, light with a phase difference of 90 degrees from the polarization plane is blocked by the polarizing filter 10, resulting in 50% of the light from the light source lamp 2 and reflector 1 being blocked. , with large loss,
The blocked light is absorbed by the polarizing filter 10, causing the polarizing filter 10 to generate heat.
この発明は、上記のような問題点に鑑みなされたもので
、偏光フィルタによる光の遮断ロスを解消して有効に使
用すると共に、遮断による発熱を防止できる液晶プロジ
ェクタ−の提供を目的とする。The present invention has been made in view of the above-mentioned problems, and aims to provide a liquid crystal projector that can be used effectively by eliminating the light blocking loss caused by the polarizing filter, and can prevent heat generation due to the blocking.
「課題を解決するための手段」
上述の課題を解決するため、この発明においては、光源
から発せられた光及びその反射光をＰ波及びＳ波に分岐
する手段と、Ｐ波及びＳ波を液晶パネルの入光側の偏光
フィルタにおける偏波面と各々同位相に調整する手段と
、調整したＰ波及びＳ波を合成する手段とが具備された
ことを特徴とするものである。"Means for Solving the Problems" In order to solve the above-mentioned problems, the present invention provides a means for splitting the light emitted from a light source and its reflected light into P waves and S waves, and a means for splitting the light emitted from a light source and its reflected light into P waves and S waves. The device is characterized in that it includes means for adjusting the polarization planes in the polarization filter on the light incident side of the liquid crystal panel to be in phase with each other, and means for synthesizing the adjusted P waves and S waves.
ｒ作 用」
第１図で示す実施第１例において、バックライト用とし
て光源ランプ２から発せられた光及びリフレクタ−１で
反射された光は、ビームスビリツタ−３でＰ波とＳ波に
分岐される。In the first implementation example shown in FIG. 1, the light emitted from the light source lamp 2 for backlighting and the light reflected by the reflector 1 are converted into P waves and S waves by the beam stabilizer 3. Branched out.
Ｐ波及びＳ波に分岐された光は、各々の波長板６．７に
よって液晶パネル１１の入光側に設置された偏光フィル
タ１０の偏光面と同位相になるよう調整された後に、合
成用プリズム８によって再び合成され、液晶パネル１１
に出光される。The light branched into P waves and S waves is adjusted by each wavelength plate 6.7 so that it has the same phase as the polarization plane of the polarizing filter 10 installed on the light incident side of the liquid crystal panel 11, and then is used for synthesis. It is synthesized again by the prism 8, and the liquid crystal panel 11
It will be illuminated.
そして、液晶パネル１１で画像が透過される。The image is then transmitted through the liquid crystal panel 11.
画像を透過した光は、出光側の偏光フィルタ１２で補正
され、投写レンズ１３に入光する。The light that has passed through the image is corrected by a polarizing filter 12 on the light output side, and then enters a projection lens 13.
その投写レンズ１３で、液晶パネル１１の画像が拡大さ
れ、映像としてスクリーンに投映される。The image on the liquid crystal panel 11 is enlarged by the projection lens 13 and projected onto the screen as an image.
「実 施 例」
続いて、この発明に係る液晶プロジェクタ−の実施の一
例について、図面を参照して詳細に説明する。"Embodiment" Next, an embodiment of the liquid crystal projector according to the present invention will be described in detail with reference to the drawings.
この発明は、光源から発せられた光及びその反射光をＰ
波及びＳ波に分岐する手段と、Ｐ波及びＳ波を液晶パネ
ルの入光側の偏光フィルタにおける偏波面と各々同位相
に調整する手段と、調整したＰ波及びＳ波を合成する手
段とが具備されている。This invention allows light emitted from a light source and its reflected light to be
means for splitting the P waves and S waves into waves, means for adjusting the P waves and S waves to have the same phase as the plane of polarization in a polarizing filter on the light incident side of the liquid crystal panel, and means for synthesizing the adjusted P waves and S waves. is equipped.
第１図は、液晶プロジェクタ−の光学系を示す構成図で
ある。FIG. 1 is a configuration diagram showing the optical system of a liquid crystal projector.
この第１図において、液晶プロジェクタ−の光学系は、
リフレクタ−１付の光源ランプ２と、ビームスビリツタ
−３と、対角位置に配置された反射ミラー４．５と、波
長板６．７と、合成用プリズム８と、コンデンサレンズ
９と、入光例の偏光フィルタ１０と、液晶パネル１１と
、出光側の偏光フィルタ１２及び投写レンズ１３とから
構成されている。In this Figure 1, the optical system of the liquid crystal projector is as follows:
A light source lamp 2 with a reflector 1, a beam stabilizer 3, a reflecting mirror 4.5 arranged diagonally, a wavelength plate 6.7, a combining prism 8, a condenser lens 9, It is composed of a polarizing filter 10 as an example of light, a liquid crystal panel 11, a polarizing filter 12 on the light output side, and a projection lens 13.
光Ｒ２から発せられた光及びリフレクタ−１で反射され
た光は、分岐する手段としてのビームスビリツタ−３で
Ｐ波及びＳ波に分岐される。The light emitted from the light R2 and the light reflected by the reflector 1 are split into P waves and S waves by a beam stabilizer 3 serving as splitting means.
ビームスビリツタ−３で分岐されたＰ波は、反射ミラー
４で反射されて調整する手段としての波長板６に入光す
る。The P wave branched by the beam stabilizer 3 is reflected by a reflection mirror 4 and enters a wavelength plate 6 as adjustment means.
この波長板６を回転させることによって、液晶パネル１
１の人口側に配置された偏光フィルタ１０の偏光面と同
位相になるよう調整する。この調整によって偏光フィル
タ１０に入光する光は、偏光フィルタ１０による光量の
ロスがなく出光される。By rotating this wavelength plate 6, the liquid crystal panel 1
Adjustment is made so that it has the same phase as the polarization plane of the polarization filter 10 placed on the population side of No. 1. With this adjustment, the light that enters the polarizing filter 10 is emitted without any loss in the amount of light caused by the polarizing filter 10.
また、ビームスビリツタ−３で分岐されたＳ波は、Ｐ波
と同様に反射ミラー５で反射されて波長板７に入光する
。Further, the S wave branched by the beam stabilizer 3 is reflected by the reflection mirror 5 and enters the wavelength plate 7 in the same manner as the P wave.
そして、その波長板７を回転させることによフて、液晶
パネル１１の人口側に配置された偏光フィルタ１０の偏
光面と同位相になるように調整する。この調整によって
、Ｐ波の場合と同様に、偏光フィルタ】０に入光する光
は、偏光フィルタ１０による光量のロスがなく出光され
る。Then, by rotating the wave plate 7, it is adjusted to have the same phase as the polarization plane of the polarization filter 10 disposed on the population side of the liquid crystal panel 11. With this adjustment, as in the case of P waves, the light entering the polarizing filter 10 is emitted without any loss in the amount of light due to the polarizing filter 10.
波長板６．７から出光されたＰ波及びＳ波は、合成する
手段としての合成用プリズム８に入光して合成され、一
つの光としてコンデンサレンズ９に出光され、そのコン
デンサレンズ９で集光され、偏光フィルタ１０に出光さ
れる。The P waves and S waves emitted from the wavelength plate 6.7 enter a combining prism 8 as a combining means, are combined, are outputted as one light to a condenser lens 9, and are condensed by the condenser lens 9. The light is emitted to the polarizing filter 10.
偏光フィルタ１０に入光した光は、偏光されて液晶パネ
ル１１へ出光され、液晶パネル１１の画像を透過する。The light that enters the polarizing filter 10 is polarized and output to the liquid crystal panel 11, and is transmitted through the image on the liquid crystal panel 11.
液晶パネル１１を通過した光は、出光側の偏光フィルタ
１２を透過して投写レンズ１３に出光される。The light that has passed through the liquid crystal panel 11 passes through a polarizing filter 12 on the light output side and is output to a projection lens 13 .
投写レンズ１３に入光された光は、この投写レンズ１３
によって拡大され、スクリーン（図示しない）に投写さ
れる。The light incident on the projection lens 13 is
The image is enlarged by , and projected onto a screen (not shown).
「発明の効果」
以上のように、この発明に係る液晶プロジェクタ−は、
光源からの光をＰ波及びＳ波とに分岐し、分岐されたＰ
波及びＳ波を波長板に入光させ、液晶パネルにおける入
光側の偏光フィルタの偏波面と同位相となるよう各調整
し、再び合成して液晶パネル側に出光するようにしたも
のである。"Effects of the Invention" As described above, the liquid crystal projector according to the present invention has
The light from the light source is split into P waves and S waves, and the split P waves are split into P waves and S waves.
Waves and S waves are introduced into a wave plate, each adjusted so that they are in phase with the polarization plane of the polarizing filter on the light input side of the liquid crystal panel, and then combined again and output to the liquid crystal panel side. .
従って、入光側の偏光フィルタでのロスが解消でき、ロ
スが解消されたことによって光源の利用効率が大幅に改
善され、明るさが向上する。Therefore, the loss in the polarizing filter on the light entrance side can be eliminated, and by eliminating the loss, the utilization efficiency of the light source is significantly improved, and the brightness is improved.
さらに、偏光フィルタにおける発熱がほとんどなくなり
、偏光フィルタの性能劣化が抑えられ、より鮮明な映像
が得られる。Furthermore, almost no heat is generated in the polarizing filter, deterioration of the polarizing filter's performance is suppressed, and clearer images can be obtained.
第１図はこの発明に係る液晶プロジェクタ−の光学系示
す構成図、第２図は従来例の構成図である。
４゜
６゜
・光源ランプ
・ビームスビリツタ−
・反射ミラー
・波長板
・合成用プリズムFIG. 1 is a block diagram showing the optical system of a liquid crystal projector according to the present invention, and FIG. 2 is a block diagram of a conventional example. 4゜6゜・Light source lamp・Beam stabilizer・Reflection mirror・Wave plate・Composition prism
Claims (1)
Ｓ波に分岐する手段と、Ｐ波及びＳ波を液晶パネルの入
光側の偏光フィルタにおける偏波面と各々同位相に調整
する手段と、調整したＰ波及びＳ波を合成する手段とが
具備されたことを特徴とする液晶プロジェクター。(1) A means for branching the light emitted from the light source and its reflected light into P waves and S waves, and adjusting the P waves and S waves to have the same phase as the plane of polarization in the polarizing filter on the light input side of the liquid crystal panel. 1. A liquid crystal projector, comprising: means for combining adjusted P waves and S waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1291710A JPH03152523A (en) | 1989-11-09 | 1989-11-09 | Liquid crystal projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1291710A JPH03152523A (en) | 1989-11-09 | 1989-11-09 | Liquid crystal projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03152523A true JPH03152523A (en) | 1991-06-28 |
Family
ID=17772398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1291710A Pending JPH03152523A (en) | 1989-11-09 | 1989-11-09 | Liquid crystal projector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03152523A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05150190A (en) * | 1991-12-02 | 1993-06-18 | Nippon Avionics Co Ltd | Linear polarized light conversion device |
| US5555186A (en) * | 1994-02-15 | 1996-09-10 | Nec Corporation | Projection type liquid crystal display apparatus using multiple polarizing beam splitters |
| US5570210A (en) * | 1993-05-06 | 1996-10-29 | Fujitsu Limited | Liquid crystal display device with directional backlight and image production capability in the light scattering mode |
| US5653520A (en) * | 1995-01-23 | 1997-08-05 | Nec Corporation | Liquid crystal display projector |
| US6152566A (en) * | 1996-10-30 | 2000-11-28 | Seiko Epson Corporation | Projector for modulating polarized luminous flux |
| KR100786064B1 (en) * | 2001-02-01 | 2007-12-17 | 엘지전자 주식회사 | Illumination System in Liquid Crystal Projector |
-
1989
- 1989-11-09 JP JP1291710A patent/JPH03152523A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05150190A (en) * | 1991-12-02 | 1993-06-18 | Nippon Avionics Co Ltd | Linear polarized light conversion device |
| US5570210A (en) * | 1993-05-06 | 1996-10-29 | Fujitsu Limited | Liquid crystal display device with directional backlight and image production capability in the light scattering mode |
| US5555186A (en) * | 1994-02-15 | 1996-09-10 | Nec Corporation | Projection type liquid crystal display apparatus using multiple polarizing beam splitters |
| US5653520A (en) * | 1995-01-23 | 1997-08-05 | Nec Corporation | Liquid crystal display projector |
| US6152566A (en) * | 1996-10-30 | 2000-11-28 | Seiko Epson Corporation | Projector for modulating polarized luminous flux |
| KR100786064B1 (en) * | 2001-02-01 | 2007-12-17 | 엘지전자 주식회사 | Illumination System in Liquid Crystal Projector |
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