JPH05203894A - Display device using light valve - Google Patents
Display device using light valveInfo
- Publication number
- JPH05203894A JPH05203894A JP4035564A JP3556492A JPH05203894A JP H05203894 A JPH05203894 A JP H05203894A JP 4035564 A JP4035564 A JP 4035564A JP 3556492 A JP3556492 A JP 3556492A JP H05203894 A JPH05203894 A JP H05203894A
- Authority
- JP
- Japan
- Prior art keywords
- light
- polarized
- light valve
- polarized light
- polarization direction
- 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
Landscapes
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
- Polarising Elements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ライトバルブ本体の両
側に偏光方向が互いに直交するかまたは平行となる第
１、第２偏光板を設けたライトバルブに光源からの光を
照射することによって表示を行なう表示装置の改良に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention irradiates light from a light source on a light valve having first and second polarizing plates whose polarization directions are orthogonal or parallel to each other on both sides of a light valve body. The present invention relates to an improvement of a display device for displaying.
【０００２】[0002]
【従来の技術】従来、この種の表示装置は図２に示すよ
うに構成されていた。すなわち、ランプ１０と反射板１
２からなる光源１４から出力した光１６をライトバルブ
１８に照射し、このライトバルブ１８上の画像を投写レ
ンズでスクリ−ン上へ投写したり、ライトバルブ１８上
の画像を直視するようにしていた。ライトバルブ１８
は、ライトバルブ本体（例えば液晶素子又はＰＬＺＴ素
子）２０と、このライトバルブ本体２０の両側に設けら
れて偏光方向が互いに直交する第１の偏光板（偏光子と
もいう）２２と第２の偏光板（検光子ともいう）２４と
からなり、第１偏光板２２は光源１４側に設けられてい
る。なお、ライトバルブ本体２０への電界印加時と無印
加時における表示の明暗状態を逆とするときは、第１偏
光板２２と第２偏光板２４はその偏光方向が互いに平行
となるように配置する。2. Description of the Related Art Conventionally, this type of display device has been constructed as shown in FIG. That is, the lamp 10 and the reflector 1
The light 16 output from the light source 14 composed of two is applied to the light valve 18, and the image on the light valve 18 is projected onto the screen by the projection lens, or the image on the light valve 18 is directly viewed. It was Light valve 18
Is a light valve body (for example, a liquid crystal element or a PLZT element) 20, a first polarizing plate (also referred to as a polarizer) 22 provided on both sides of the light valve body 20 and having polarization directions orthogonal to each other, and a second polarized light. A plate (also referred to as an analyzer) 24, and the first polarizing plate 22 is provided on the light source 14 side. When the bright and dark states of the display when the electric field is applied to the light valve body 20 and when the electric field is not applied are reversed, the first polarizing plate 22 and the second polarizing plate 24 are arranged such that their polarization directions are parallel to each other. To do.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、図２に
示した従来例では、光源１４から出力した光１６のう
ち、第１偏光板２２を透過した光だけしか利用していな
いので、光の利用効率が低いという問題点があった。す
なわち、光源１４から出力した光１６はあらゆる方向に
偏光しており、そのうちの第１偏光板２２を透過した光
だけしか表示に利用していないからである。However, in the conventional example shown in FIG. 2, of the light 16 output from the light source 14, only the light transmitted through the first polarizing plate 22 is used, so that the light is used. There was a problem of low efficiency. That is, the light 16 output from the light source 14 is polarized in all directions, and only the light transmitted through the first polarizing plate 22 is used for display.
【０００４】例えば、光源１４から出力した光１６は一
般に偏光方向が互いに直交するＰ偏光成分の偏光光１６
ＰとＳ偏光成分の偏光光１６Ｓとに分解できるが、第１
偏光板２２はＰ、Ｓ偏光成分の偏光光１６Ｐ、１６Ｓの
うちのＰ偏光成分の偏光光１６Ｐしか透過しないので、
光の利用効率が最大で１／２であった。なお、図２にお
いて、ライトバルブ本体（例えば液晶素子）２０に電圧
を印加して全体を透過モ−ドとしたときは、第１偏光板
２２を透過したＰ偏光成分の偏光光１６Ｐは、ライトバ
ルブ本体２０によってその偏光方向がほぼ９０度変わっ
てＳ偏光成分の偏光光１６ＳＰとなり、第２偏光板２４
を透過する。For example, the light 16 output from the light source 14 is generally a P-polarized light component 16 whose polarization directions are orthogonal to each other.
Although it can be decomposed into polarized light 16S of P and S polarization components,
Since the polarizing plate 22 transmits only the polarized light 16P of the P polarized component of the polarized light 16P of the P polarized component and the polarized light 16S of the S polarized component,
The maximum light utilization efficiency was 1/2. In FIG. 2, when a voltage is applied to the light valve body (for example, a liquid crystal element) 20 to set the whole in a transmission mode, the polarized light 16P of the P polarization component transmitted through the first polarizing plate 22 is The polarization direction of the bulb body 20 is changed by approximately 90 degrees to become the polarized light 16SP of the S polarization component, and the second polarizing plate 24
Through.
【０００５】本発明は上述の問題点に鑑みなされたもの
で、ライトバルブを用いた表示装置において光の利用効
率を高くすることを目的とするものである。The present invention has been made in view of the above problems, and an object of the present invention is to improve the light utilization efficiency in a display device using a light valve.
【０００６】[0006]
【課題を解決するための手段】本発明は、ライトバルブ
本体の両側に偏光方向が互いに直交するかまたは平行と
なる第１、第２偏光板を設けてライトバルブを形成し、
このライトバルブの第１偏光板側に光源からの光を照射
することによって表示を行なう表示装置において、前記
光源からの光を偏光方向が前記第１偏光板の偏光方向と
平行な偏光光と直交する偏光光の２つに分解する偏光ビ
−ムスプリッタと、この偏光ビ−ムスプリッタで分解し
た２つの偏光光のうちの一方の偏光方向をほぼ９０度変
える１／２波長板と、前記偏光ビ−ムスプリッタで分解
した２つの偏光光のうちの他方の偏光光と前記１／２波
長板で偏光方向を変えた偏光光とを前記ライトバルブの
第１偏光板側に案内する光学系とを具備してなることを
特徴とするものである。According to the present invention, a light valve is formed by providing first and second polarizing plates whose polarization directions are orthogonal or parallel to each other on both sides of a light valve body.
In a display device that performs display by irradiating light from a light source on the first polarizing plate side of the light valve, the light from the light source is orthogonal to polarized light whose polarization direction is parallel to that of the first polarizing plate. A polarized beam splitter that splits the polarized light into two polarized light beams, a half-wave plate that changes the polarization direction of one of the two polarized light beams split by the polarized beam splitter by approximately 90 degrees, and the polarized light beam. An optical system for guiding the other polarized light of the two polarized lights decomposed by the beam splitter and the polarized light whose polarization direction is changed by the ½ wavelength plate to the first polarizing plate side of the light valve. It is characterized by comprising.
【０００７】[0007]
【作用】偏光ビ−ムスプリッタは、光源から出力した光
を偏光方向が第１偏光板の偏光方向と平行な偏光成分の
偏光光（例えばＰ偏光成分の偏光光）と直交する偏光成
分の偏光光（例えばＳ偏光成分の偏光光）の２つの偏光
光に分解する。この分解された２つの偏光光のうちの一
方（例えばＳ偏光成分の偏光光）の偏光方向は１／２波
長板によってほぼ９０度変えられ、他方（例えばＰ偏光
成分の偏光光）の偏光方向と同一となる。光学系は、こ
の同一の偏光方向に揃った２つの偏光光をライトバルブ
の第１偏光板側に案内する。そして、観視者は、ライト
バルブ上の画像を投写レンズでスクリ−ン上に拡大投写
したものを観視するか、または、ライトバルブ上の画像
を直接観視する。The polarizing beam splitter is a polarized light component whose polarization direction is orthogonal to polarized light having a polarization component parallel to the polarization direction of the first polarizing plate (for example, P polarized light). The light (for example, the polarized light of the S-polarized component) is decomposed into two polarized lights. The polarization direction of one of the decomposed two polarized lights (for example, the polarized light of the S-polarized component) is changed by about 90 degrees by the ½ wavelength plate, and the polarization direction of the other (for example, the polarized light of the P-polarized component). Is the same as The optical system guides the two polarized lights aligned in the same polarization direction to the first polarizing plate side of the light valve. Then, the viewer views the image on the light valve enlarged and projected on the screen by the projection lens, or directly views the image on the light valve.
【０００８】[0008]
【実施例】以下、本発明によるライトバルブを有する表
示装置の一実施例を図１を用いて説明する。図１におい
て図２と同一部分は同一符号とする。図１において、１
４は光源で、この光源１４はランプ１０と反射板１２と
からなっている。１８はライトバルブで、このライトバ
ルブ１８は、ライトバルブ本体（例えば液晶素子又はＰ
ＬＺＴ素子）２０と、このライトバルブ本体２０の両側
に設けられて偏光方向が互いに直交する第１の偏光板
（偏光子ともいう）２２と第２の偏光板（検光子ともい
う）２４とからなり、前記第１偏光板２２は前記光源１
４側に設けられている。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a display device having a light valve according to the present invention will be described below with reference to FIG. 1, the same parts as those in FIG. 2 are designated by the same reference numerals. In FIG. 1, 1
Reference numeral 4 denotes a light source, and the light source 14 includes a lamp 10 and a reflector 12. Reference numeral 18 denotes a light valve. This light valve 18 is a light valve body (for example, a liquid crystal element or a P
LZT element) 20, a first polarizing plate (also referred to as a polarizer) 22 and a second polarizing plate (also referred to as an analyzer) 24 that are provided on both sides of the light valve body 20 and have polarization directions orthogonal to each other. And the first polarizing plate 22 is the light source 1
It is provided on the 4 side.
【０００９】前記光源１４と前記ライトバルブ１８の間
には、本発明に特有の偏光ビ−ムスプリッタ３０、３２
と、１／２波長板３４と、光学系３６とが設けられてい
る。前記偏光ビ−ムスプリッタ３０、３２は、前記光源
１４から出力した光１６を２つの偏光光（例えばＰ偏光
成分の偏光光１６ＰとＳ偏光成分の偏光光１６Ｓ）に分
解するように構成されている。Between the light source 14 and the light valve 18, polarization beam splitters 30 and 32 peculiar to the present invention are provided.
A half-wave plate 34 and an optical system 36 are provided. The polarization beam splitters 30 and 32 are configured to decompose the light 16 output from the light source 14 into two polarized lights (for example, a polarized light 16P having a P polarization component and a polarized light 16S having an S polarization component). There is.
【００１０】前記１／２波長板３４は、前記偏光ビ−ム
スプリッタ３０、３２で分解した２つの偏光光のうちの
一方の偏光光（例えばＳ偏光成分の偏光光１６Ｓ、１６
Ｓ）の偏光方向をほぼ９０度変えるように構成されてい
る。前記光学系３６は、ミラ−３８、４０とコンデンサ
レンズ４２とからなり、前記偏光ビ−ムスプリッタ３
０、３２で分解した２つの偏光光のうちの他方の偏光光
（例えばＰ偏光成分の偏光光１６Ｐ、１６Ｐ）と、前記
１／２波長板３４で偏光方向を変えた偏光光（例えばＰ
偏光成分の偏光光１６ＰＳ、１６ＰＳ）とを前記ライト
バルブ１８の第１偏光板２２側に案内するように構成さ
れている。前記コンデンサレンズ４２は凸レンズ４４と
凹レンズ４６とからなっている。The half-wave plate 34 is one of the two polarized lights separated by the polarizing beam splitters 30 and 32 (for example, polarized light 16S and 16 having S-polarized components).
It is configured to change the polarization direction of S) by approximately 90 degrees. The optical system 36 comprises mirrors 38 and 40 and a condenser lens 42, and the polarization beam splitter 3
The other polarized light (for example, the polarized light 16P, 16P of the P-polarized component) of the two polarized lights decomposed by 0 and 32, and the polarized light whose polarization direction is changed by the ½ wavelength plate 34 (for example, P
The polarized light of polarized components 16PS, 16PS) is guided to the first polarizing plate 22 side of the light valve 18. The condenser lens 42 includes a convex lens 44 and a concave lens 46.
【００１１】つぎに、前記実施例の作用を説明する。 （イ）光源１４から出力した光１６、…は偏光ビ−ムス
プリッタ３０、３２によって偏光方向が互いに直交する
Ｐ偏光成分の偏光光１６Ｐ、…とＳ偏光成分の偏光光１
６Ｓ、…の２つに分解される。Next, the operation of the above embodiment will be described. (A) The light 16 output from the light source 14 is polarized light 16P of P-polarized component whose polarization directions are orthogonal to each other by the polarization beam splitters 30 and 32, and polarized light 1 of S-polarized component 1
6S, ...
【００１２】（ロ）偏光ビ−ムスプリッタ３０、３２に
よって分解したＳ偏光成分の偏光光１６Ｓ、…は、１／
２波長板３４によって偏光方向がほぼ９０度変わってＰ
偏光成分の偏光光１６ＰＳ、…となり、ついでミラ−３
８、４０によって光源１４からの光１６、…の光軸と平
行な光となってコンデンサレンズ４２に入力する（入射
する）。また、偏光ビ−ムスプリッタ３０、３２によっ
て分解したＰ偏光成分の偏光光１６Ｐ、…は、光１６、
…の光軸と平行な状態で直接コンデンサレンズ４２に入
力する。(B) The polarized light 16S of the S-polarized component decomposed by the polarization beam splitters 30 and 32 is 1 /
The polarization direction changes by almost 90 degrees by the two-wave plate 34
The polarized light of the polarized component becomes 16PS, ..., and then Mira-3
The light from the light source 14 becomes parallel to the optical axis of the light 16 from the light sources 8 and 40 and is input (incident) to the condenser lens 42. Further, the polarized light 16P of the P-polarized component decomposed by the polarization beam splitters 30 and 32 is the light 16,
It is directly input to the condenser lens 42 in a state parallel to the optical axis of.
【００１３】（ハ）コンデンサレンズ４２は、ミラ−３
８、４０からのＰ偏光成分の偏光光１６ＰＳ、…と、偏
光ビ−ムスプリッタ３０、３２からのＰ偏光成分の偏光
光１６Ｐ、…とを所定のビ−ム径に絞ってライトバルブ
１８の第１偏光板２２に案内する。この第１偏光板２２
はＰ偏光成分の偏光光を透過するように配置されている
ので、上述のＰ偏光成分の偏光光１６ＰＳ、…と１６
Ｐ、…はそのまま透過する。(C) The condenser lens 42 is a mirror-3
The polarized light 16PS of the P-polarized component from 8 and 40 and the polarized light 16P of the P-polarized component from the polarizing beam splitters 30 and 32 are narrowed down to a predetermined beam diameter, and the light of the light valve 18 is reduced. Guide to the first polarizing plate 22. This first polarizing plate 22
Are arranged so as to transmit the polarized light of the P-polarized component, the polarized lights 16PS, ...
P, ... Are transmitted as they are.
【００１４】（ニ）そして、ライトバルブ本体２０に表
示用の電圧を印加することによってライトバルブ１８上
に画像が形成され、この画像が第２偏光板２４側から観
視者に直視されるか、または第２偏光板２４側から投写
レンズによってスクリ−ン上に拡大投写される。このと
き、光源からの光の偏光方向が互いに直交する２つの偏
光成分の偏光光をともに利用しているので、１つの偏光
成分の偏光光しか利用していなかった従来例と比べて、
表示画面の明るさをほぼ２倍にすることができる。(D) By applying a display voltage to the light valve body 20, an image is formed on the light valve 18, and whether this image is viewed directly by the viewer from the second polarizing plate 24 side. Alternatively, the image is enlarged and projected on the screen by the projection lens from the second polarizing plate 24 side. At this time, since the polarized light of the two polarized components in which the polarization directions of the light from the light source are orthogonal to each other are used together, as compared with the conventional example in which only the polarized light of one polarized component is used,
The brightness of the display screen can be almost doubled.
【００１５】例えば、ライトバルブ本体２０に電圧を印
加してライトバルブ１８全体を透過モ−ドとしたとき
は、図１に示すように、第１偏光板２２を透過したＰ偏
光成分の偏光光１６ＰＳ、…と１６Ｐ、…は、ライトバ
ルブ本体２０によってその偏光方向がほぼ９０度変わっ
てＳ偏光成分の偏光光１６ＳＰＳ、…と１６ＳＰ、…と
なり、第２偏光板２４を透過し、１つの偏光成分の偏光
光１６ＳＰ、…しか利用していなかった従来例と比べ
て、明るさがほぼ２倍になる。For example, when a voltage is applied to the light valve body 20 to set the entire light valve 18 in the transmission mode, as shown in FIG. 1, the polarized light of the P polarization component transmitted through the first polarizing plate 22. 16PS, ... And 16P, ... By the light valve main body 20, the polarization directions thereof are changed by approximately 90 degrees to become polarized light 16SPS, ... And 16SP ,. The brightness is almost doubled as compared with the conventional example in which only the component polarized light 16SP, ... Is used.
【００１６】前記実施例では、ライトバルブを、ライト
バルブ本体と、このライトバルブ本体の両側に設けられ
て偏光方向が互いに直交する第１、第２偏光板とで形成
した表示装置に本発明を利用した場合について説明した
が、本発明はこれに限るものでなく、ライトバルブ本体
への電界印加時と無印加時における表示の明暗状態を逆
にした表示装置についても利用できること勿論である。
すなわち、ライトバルブ本体と、このライトバルブ本体
の両側に設けられて偏光方向が互いに平行となる第１、
第２偏光板とでライトバルブを形成した表示装置につい
ても本発明を利用できる。In the above embodiment, the present invention is applied to a display device in which the light valve is formed by the light valve body and the first and second polarizing plates provided on both sides of the light valve body and having polarization directions orthogonal to each other. Although the present invention has been described above, the present invention is not limited to this, and it goes without saying that the present invention can also be applied to a display device in which the bright and dark states of the display are reversed when an electric field is applied to the light valve body and when no electric field is applied.
That is, the light valve main body and the first, which is provided on both sides of the light valve main body and has polarization directions parallel to each other,
The present invention can be applied to a display device in which a light valve is formed with the second polarizing plate.
【００１７】前記実施例では、光学系をミラ−とコンデ
ンサレンズとで形成し、偏光ビ−ムスプリッタで分解し
た２つの偏光光の進行方向をミラ−によって同一とし、
この同一進行方向に揃った２つの偏光光をコンデンサレ
ンズによって所定のビ−ム径の平行光にしてライトバル
ブに案内するようにしたが、本発明はこれに限るもので
なく、偏光ビ−ムスプリッタで分解した２つの偏光光の
うちの一方であって１／２波長板で偏光方向を変えた偏
光光と、偏光ビ−ムスプリッタで分解した２つの偏光光
のうちの他方の偏光光とをライトバルブの第１偏光板側
に案内するものであればよい。In the above embodiment, the optical system is formed by the mirror and the condenser lens, and the traveling directions of the two polarized lights separated by the polarization beam splitter are made the same by the mirror.
The two polarized lights aligned in the same traveling direction are converted into parallel light having a predetermined beam diameter by the condenser lens and guided to the light valve. However, the present invention is not limited to this, and the polarized beam is used. One of the two polarized lights decomposed by the splitter, and the polarized light whose polarization direction is changed by the half-wave plate, and the other polarized light of the two polarized lights decomposed by the polarizing beam splitter. May be guided to the first polarizing plate side of the light valve.
【００１８】前記実施例では、モノクロ用のライトバル
ブを用いた表示装置に本発明を利用した場合について説
明したが、本発明はこれに限るものでなく、カラ−用の
ライトバルブを用いた表示装置についても利用すること
ができる。例えば、光源からの光をダイクロイックミラ
−でＲ（赤色）、Ｇ（緑色）、Ｂ（青色）の３原色の光
に分解し、このＲ、Ｇ、Ｂの３原色の光を本発明に特有
の偏光ビ−ムスプリッタ、１／２波長板および光学系を
介してＲ、Ｇ、Ｂ用のライトバルブに入力するようにし
てもよい。In the above embodiment, the case where the present invention is applied to a display device using a monochrome light valve has been described, but the present invention is not limited to this, and a display using a color light valve is used. It can also be used for devices. For example, the light from the light source is decomposed into light of three primary colors of R (red), G (green) and B (blue) by a dichroic mirror, and the light of the three primary colors of R, G and B is unique to the present invention. Alternatively, the light may be input to the R, G, and B light valves via the polarization beam splitter, the half-wave plate, and the optical system.
【００１９】[0019]
【発明の効果】本発明によるライトバルブを有する表示
装置は、上記のように、偏光ビ−ムスプリッタによって
光源からの光を偏光方向が第１偏光板の偏光方向と平行
な偏光光と直交する偏光光の２つの偏光光に分解し、１
／２波長板によってこの分解した２つの偏光光のうちの
一方の偏光方向をほぼ９０度変えることによって他方の
偏光光の偏光方向と同一の偏光方向とし、これらの同一
の偏光方向の偏光光を光学系によってライトバルブの第
１偏光板側に案内するように構成したので、光源からの
光の偏光方向が互いに直交する２つの偏光成分の偏光光
を共に利用することができる。このため、表示画面の明
るさを従来例のほぼ２倍にすることができ、光源からの
光の利用効率を従来より向上させることができる。As described above, in the display device having the light valve according to the present invention, the light from the light source is orthogonal to the polarized light whose polarization direction is parallel to that of the first polarizing plate by the polarization beam splitter. Split the polarized light into two polarized lights, and
By changing the polarization direction of one of the decomposed two polarized lights by about 90 degrees by the / 2 wavelength plate, the polarized direction of the other polarized light is made the same, and the polarized light of the same polarized direction is Since the light is guided to the first polarizing plate side of the light valve by the optical system, it is possible to use the polarized light of two polarization components in which the polarization directions of the light from the light source are orthogonal to each other. Therefore, the brightness of the display screen can be almost doubled as compared with the conventional example, and the utilization efficiency of the light from the light source can be improved as compared with the conventional example.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明によるライトバルブを用いた表示装置の
一実施例を示す要部の概略構成図である。FIG. 1 is a schematic configuration diagram of a main part showing an embodiment of a display device using a light valve according to the present invention.
【図２】従来例の装置の概略構成図である。FIG. 2 is a schematic configuration diagram of a conventional device.
１４…光源、 １６…Ｐ偏光成分の偏光光１６ＰとＳ偏光成分の偏光光
１６Ｓを含む光、 １６Ｐ、１６ＰＳ…Ｐ偏光成分の偏光光、 １６Ｓ、１６ＳＰ、１６ＳＰＳ…Ｓ偏光成分の偏光光、 １８…ライトバルブ、 ２０…ライトバルブ本体、 ２
２…第１偏光板、 ２４…第２偏光板、 ３０、３２…偏光ビ−ムスプリッ
タ、 ３４…１／２波長板、 ３６…光学系、 ３８、４０…
ミラ−、 ４２…コンデンサレンズ、 ４４…凸レンズ、 ４６…
凹レンズ。14 ... Light source, 16 ... Light including polarized light 16P of P polarized component and polarized light 16S of S polarized component, 16P, 16PS ... Polarized light of P polarized component, 16S, 16SP, 16SPS ... Polarized light of S polarized component, 18 … Light valve, 20… Light valve body, 2
2 ... 1st polarizing plate, 24 ... 2nd polarizing plate, 30, 32 ... Polarization beam splitter, 34 ... 1/2 wavelength plate, 36 ... Optical system, 38, 40 ...
Mirror, 42 ... Condenser lens, 44 ... Convex lens, 46 ...
concave lens.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０３Ｂ 21/14 7316−2Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location G03B 21/14 7316-2K
Claims (2)
に直交するかまたは平行となる第１、第２偏光板を設け
てライトバルブを形成し、このライトバルブの第１偏光
板側に光源からの光を照射することによって表示を行な
う表示装置において、前記光源からの光を偏光方向が前
記第１偏光板の偏光方向と平行な偏光光と直交する偏光
光の２つに分解する偏光ビ−ムスプリッタと、この偏光
ビ−ムスプリッタで分解した２つの偏光光のうちの一方
の偏光方向をほぼ９０度変える１／２波長板と、前記偏
光ビ−ムスプリッタで分解した２つの偏光光のうちの他
方の偏光光と前記１／２波長板で偏光方向を変えた偏光
光とを前記ライトバルブの第１偏光板側に案内する光学
系とを具備してなることを特徴とするライトバルブを用
いた表示装置。1. A light valve is formed by providing first and second polarizing plates having polarization directions orthogonal to or parallel to each other on both sides of a light valve body, and a light source is provided on the first polarizing plate side of the light valve. In a display device which performs display by irradiating the above-mentioned light, a polarized light beam that decomposes the light from the light source into two polarized light beams whose polarization direction is parallel to the polarization direction of the first polarizing plate and orthogonal to the polarized light beam. Of the two polarized lights separated by the polarizing beam splitter and a half-wave plate that changes the polarization direction of one of the two polarized lights separated by the polarizing beam splitter by about 90 degrees. A light valve comprising: an optical system for guiding the other polarized light of the other and the polarized light whose polarization direction is changed by the half-wave plate to the first polarizing plate side of the light valve. Display device using.
た偏光光の進行方向を、偏光ビ−ムスプリッタで分解し
た２つの偏光光のうちの他方の偏光光の進行方向と同一
にするためのミラ−と、この同一進行方向に揃った２つ
の偏光光を所定のビ−ム径の平行光にしてライトバルブ
の第１偏光板側に案内するコンデンサレンズとを具備し
てなる請求項１記載のライトバルブを用いた表示装置。2. An optical system, wherein the traveling direction of polarized light whose polarization direction is changed by a half-wave plate is the traveling direction of the other polarized light of the two polarized lights decomposed by a polarizing beam splitter. A mirror for making the same and a condenser lens for guiding two polarized lights aligned in the same traveling direction to parallel light having a predetermined beam diameter to the first polarizing plate side of the light valve are provided. A display device using the light valve according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4035564A JPH05203894A (en) | 1992-01-27 | 1992-01-27 | Display device using light valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4035564A JPH05203894A (en) | 1992-01-27 | 1992-01-27 | Display device using light valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05203894A true JPH05203894A (en) | 1993-08-13 |
Family
ID=12445249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4035564A Pending JPH05203894A (en) | 1992-01-27 | 1992-01-27 | Display device using light valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05203894A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0756167A (en) * | 1993-08-18 | 1995-03-03 | Nec Corp | Polarization light source and projection type liquid crystal display device using the same |
| JPH0764075A (en) * | 1993-08-25 | 1995-03-10 | Nec Corp | Liquid crystal projection device |
| JPH07146474A (en) * | 1993-11-22 | 1995-06-06 | Nec Corp | Polarization converting optical system of projection type liquid crystal display device |
| JPH08201751A (en) * | 1995-01-31 | 1996-08-09 | Hitachi Ltd | Picture display device |
| JPH08201753A (en) * | 1995-01-23 | 1996-08-09 | Nec Corp | Projection type liquid crystal display device |
| WO1999024852A1 (en) * | 1997-10-16 | 1999-05-20 | Matsushita Electric Industrial Co., Ltd. | Hologram element polarization separating device, polarization illuminating device, and image display |
| JPH11231134A (en) * | 1998-02-13 | 1999-08-27 | Fuji Xerox Co Ltd | Method and device for producing optical film |
| EP0883302A3 (en) * | 1997-06-03 | 2000-09-27 | Hitachi, Ltd. | Projection type liquid crystal display device |
| JP2013152179A (en) * | 2012-01-26 | 2013-08-08 | Nikon Corp | Spectroscope and microspectroscopy system |
| EP2846180A4 (en) * | 2013-04-02 | 2015-05-13 | Master Image 3D Asia Llc | Stereoscopic imaging device |
| US9927691B2 (en) | 2006-09-29 | 2018-03-27 | Reald Inc. | Polarization conversion systems for stereoscopic projection |
| US10203511B2 (en) | 2007-05-09 | 2019-02-12 | Reald Inc. | Polarization conversion system and method for projecting polarization encoded imagery |
| US10291906B2 (en) | 2013-12-16 | 2019-05-14 | Reald Inc. | Stereoscopic image device having improved brightness and method for providing stereoscopic image |
| US11223819B2 (en) | 2015-04-06 | 2022-01-11 | Reald Inc. | Stereoscopic image display apparatus with alignment function and method of displaying stereoscopic image using the same |
-
1992
- 1992-01-27 JP JP4035564A patent/JPH05203894A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0756167A (en) * | 1993-08-18 | 1995-03-03 | Nec Corp | Polarization light source and projection type liquid crystal display device using the same |
| JPH0764075A (en) * | 1993-08-25 | 1995-03-10 | Nec Corp | Liquid crystal projection device |
| JPH07146474A (en) * | 1993-11-22 | 1995-06-06 | Nec Corp | Polarization converting optical system of projection type liquid crystal display device |
| JPH08201753A (en) * | 1995-01-23 | 1996-08-09 | Nec Corp | Projection type liquid crystal display device |
| JPH08201751A (en) * | 1995-01-31 | 1996-08-09 | Hitachi Ltd | Picture display device |
| EP0883302A3 (en) * | 1997-06-03 | 2000-09-27 | Hitachi, Ltd. | Projection type liquid crystal display device |
| WO1999024852A1 (en) * | 1997-10-16 | 1999-05-20 | Matsushita Electric Industrial Co., Ltd. | Hologram element polarization separating device, polarization illuminating device, and image display |
| JPH11231134A (en) * | 1998-02-13 | 1999-08-27 | Fuji Xerox Co Ltd | Method and device for producing optical film |
| US11143948B2 (en) | 2006-09-29 | 2021-10-12 | Reald Inc. | Polarization conversion systems for stereoscopic projection |
| US9927691B2 (en) | 2006-09-29 | 2018-03-27 | Reald Inc. | Polarization conversion systems for stereoscopic projection |
| US10203511B2 (en) | 2007-05-09 | 2019-02-12 | Reald Inc. | Polarization conversion system and method for projecting polarization encoded imagery |
| US10739611B2 (en) | 2007-05-09 | 2020-08-11 | Reald Inc. | 3D projection system |
| JP2013152179A (en) * | 2012-01-26 | 2013-08-08 | Nikon Corp | Spectroscope and microspectroscopy system |
| JP2015526747A (en) * | 2013-04-02 | 2015-09-10 | マスターイメージ ３ディー アジア リミテッド ライアビリティ カンパニー | 3D image device |
| US9958697B2 (en) | 2013-04-02 | 2018-05-01 | Reald Inc. | Stereoscopic image apparatus |
| JP2016153896A (en) * | 2013-04-02 | 2016-08-25 | マスターイメージ ３ディー アジア リミテッド ライアビリティ カンパニー | Stereoscopic imaging device |
| US10914965B2 (en) | 2013-04-02 | 2021-02-09 | Reald Inc. | Stereoscopic image apparatus |
| EP2846180A4 (en) * | 2013-04-02 | 2015-05-13 | Master Image 3D Asia Llc | Stereoscopic imaging device |
| US11520163B2 (en) | 2013-04-02 | 2022-12-06 | Reald Inc. | Stereoscopic image apparatus |
| US10291906B2 (en) | 2013-12-16 | 2019-05-14 | Reald Inc. | Stereoscopic image device having improved brightness and method for providing stereoscopic image |
| US11223819B2 (en) | 2015-04-06 | 2022-01-11 | Reald Inc. | Stereoscopic image display apparatus with alignment function and method of displaying stereoscopic image using the same |
| US11575880B2 (en) | 2015-04-06 | 2023-02-07 | Reald Inc. | Stereoscopic image display apparatus with alignment function and method of displaying stereoscopic image using the same |
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