JPH07146474A - Polarization converting optical system of projection type liquid crystal display device - Google Patents
Polarization converting optical system of projection type liquid crystal display deviceInfo
- Publication number
- JPH07146474A JPH07146474A JP5316091A JP31609193A JPH07146474A JP H07146474 A JPH07146474 A JP H07146474A JP 5316091 A JP5316091 A JP 5316091A JP 31609193 A JP31609193 A JP 31609193A JP H07146474 A JPH07146474 A JP H07146474A
- Authority
- JP
- Japan
- Prior art keywords
- light
- polarized light
- liquid crystal
- polarization
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、投射型液晶表示装置の
偏光変換光学系に関し、特に、光源から照射される光の
利用効率を高める投射型液晶表示装置の偏光変換光学系
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarization conversion optical system for a projection type liquid crystal display device, and more particularly to a polarization conversion optical system for a projection type liquid crystal display device which enhances utilization efficiency of light emitted from a light source.
【０００２】[0002]
【従来の技術】近年、映像の大画面表示への要望が高ま
っている。大画面表示を行う装置として小型の液晶パネ
ルの表示内容を拡大投射する投射型液晶表示装置があ
る。2. Description of the Related Art In recent years, there has been an increasing demand for large-screen display of images. 2. Description of the Related Art As a device for displaying a large screen, there is a projection type liquid crystal display device for enlarging and projecting the display contents of a small liquid crystal panel.
【０００３】偏光変換光学系のない投射型液晶表示装置
は、例えば図３に示す構成となっている。投射型液晶表
示装置の構成において、液晶パネル６０では、その原理
により、光源４０から照射されるビームの内の一偏光光
のみが透過し、その透過光を投射レンズ７０により拡大
して投影写像８０を得ている。このため、光源４０から
投射された光束の液晶パネル６０における利用率は５０
％以下である。なお、利用されていない光束のエネルギ
ーは、液晶パネル５で熱に変換されている。A projection type liquid crystal display device having no polarization conversion optical system has, for example, the configuration shown in FIG. In the configuration of the projection type liquid crystal display device, in the liquid crystal panel 60, due to its principle, only one polarized light of the beam emitted from the light source 40 is transmitted, and the transmitted light is enlarged by the projection lens 70 to project a projection image 80. Is getting Therefore, the utilization rate of the light flux projected from the light source 40 in the liquid crystal panel 60 is 50.
% Or less. The energy of the light flux that is not used is converted into heat by the liquid crystal panel 5.
【０００４】上記の光束利用率を向上させる措置として
図４に示す構成の偏光変換光学系が考えられる。図４に
示す光学系は、光源４０からの光束をｐ偏光光とｓ偏光
光とに分離する偏光ビームスプリッタ１００（以下ＰＢ
Ｓという）を備えている。ＰＢＳ１００は２つの偏光ビ
ームスプリッタより構成され、２つの偏光ビームスプリ
ッタの偏光分離面は、互いに直交している。また、この
ＰＢＳ１００により分離・反射されたｓ偏光光の光路を
変えるための反射ミラー２００をＰＢＳ１００に隣接さ
せ、且つ反射ミラー２００の透過光に対する角度ａ’
を、ａ’＝４５度で配置し、ｓ偏光光の光路中に位相差
板３００を配置している。このような構成により、ＰＢ
Ｓ１００により分離されたｐ偏光光の他にｓ偏光光をｐ
偏光光に変換し、その光路をｐ偏光光に揃えて出射する
ため、偏光変換光学系を設けない場合には利用されなか
ったＳ偏光光を有効に使用することが可能となる。よっ
て、光束利用効率が向上する。A polarization conversion optical system having the configuration shown in FIG. 4 is conceivable as a measure for improving the luminous flux utilization rate. The optical system shown in FIG. 4 has a polarization beam splitter 100 (hereinafter referred to as PB) that splits a light beam from a light source 40 into p-polarized light and s-polarized light.
S). The PBS 100 is composed of two polarization beam splitters, and the polarization separation planes of the two polarization beam splitters are orthogonal to each other. Further, a reflection mirror 200 for changing the optical path of the s-polarized light separated / reflected by the PBS 100 is adjacent to the PBS 100, and the angle a ′ of the reflection mirror 200 with respect to the transmitted light.
Is arranged at a ′ = 45 degrees, and the retardation plate 300 is arranged in the optical path of the s-polarized light. With this configuration, the PB
In addition to p-polarized light separated by S100, p-polarized s-polarized light
Since the light is converted into polarized light and the light path is aligned with the p-polarized light to be emitted, it is possible to effectively use the S-polarized light that has not been used unless the polarization conversion optical system is provided. Therefore, the luminous flux utilization efficiency is improved.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記の
ｓ偏光光の利用を考慮した投射型液晶表示装置で、ＰＢ
Ｓ１００の透過光と反射光を液晶パネル６０の同一位置
に集光し輝度を高めるためには、図５に示されているよ
うに光線を光軸に対して集中角をもって入射させること
が必要となる。光束密度を上げるために、図５に示され
ているように反射ミラー２００の角度ａ”を４５度より
小さくした場合、反射ミラー２００によって反射された
光の光路は、ＰＢＳ１００を透過して直進する光束の光
軸と平行でなくなり、ＰＢＳ１００側に近づくように傾
斜する。この反射光のＰＢＳ１００側への光路変更は、
ＰＢＳ１００自体が光路の妨げとなる問題を生じる。構
造的・物理的な関係から、分離されたｓ偏光光のうちＰ
ＢＳ１００に近い中心側ほどこの影響を受け易い。光源
４０の出射する光線は一般的に、中心部ほど光束密度が
高い分布状態で構成されている。このため、ＰＢＳ１０
０が中心部の光束に対して光路の障壁となる上記の問題
は、障害の影響度が大きいと言える。However, in the projection type liquid crystal display device considering the use of the s-polarized light, the PB
In order to collect the transmitted light of S100 and the reflected light at the same position of the liquid crystal panel 60 to increase the brightness, it is necessary to make the light rays incident at an angle of convergence with respect to the optical axis, as shown in FIG. Become. As shown in FIG. 5, when the angle a ″ of the reflection mirror 200 is set to be smaller than 45 degrees in order to increase the luminous flux density, the optical path of the light reflected by the reflection mirror 200 passes through the PBS 100 and goes straight. It is no longer parallel to the optical axis of the light flux and is inclined so as to approach the PBS 100 side.
The PBS 100 itself causes a problem of obstructing the optical path. Due to the structural and physical relationships, P of the separated s-polarized light
The central side closer to BS100 is more susceptible to this influence. The light beam emitted from the light source 40 is generally formed in a distribution state in which the luminous flux density is higher toward the central portion. Therefore, PBS10
It can be said that the above-mentioned problem that 0 is a barrier of the optical path with respect to the light flux in the central portion has a large influence of the obstacle.
【０００６】本発明は、上記の問題点を解消し、光の利
用効率を高めた投射型液晶表示装置の偏光変換光学系を
提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a polarization conversion optical system for a projection type liquid crystal display device in which light utilization efficiency is improved.
【０００７】[0007]
【課題を解決するための手段】本発明によれば、光源か
ら照射される光束を第１の偏光光と第２の偏光光とに分
離して出力する投射型液晶表示装置の偏光変換光学系に
おいて、該光学系は、互いに直交する少なくとも２つの
偏光分離面により構成される偏光ビームスプリッタと、
前記偏光ビームスプリッタの偏光分離面により反射、分
離された前記第２の偏光光の光路を第１の偏光光に対し
て略平行光に反射させる光束反射手段と、前記光束反射
手段により反射された第２の偏光光の光軸を回転させ、
出力する位相変換手段と、前記光束反射手段により反射
された第２の偏光光を前記第１の偏光光の光軸に対し集
束するように屈折させる少なくとも１つの屈折手段を有
することを特徴とする。According to the present invention, a polarization conversion optical system of a projection type liquid crystal display device which separates a light beam emitted from a light source into a first polarized light and a second polarized light and outputs them. In the optical system, a polarization beam splitter configured by at least two polarization splitting surfaces orthogonal to each other,
A light flux reflecting unit that reflects the optical path of the second polarized light reflected and split by the polarization splitting surface of the polarization beam splitter into substantially parallel light with respect to the first polarized light, and is reflected by the light flux reflecting unit. Rotate the optical axis of the second polarized light,
It has a phase converting means for outputting and at least one refracting means for refracting the second polarized light reflected by the luminous flux reflecting means so as to be converged with respect to the optical axis of the first polarized light. .
【０００８】[0008]
【作用】本発明の投射型液晶表示装置の偏光変換光学系
によれば、屈折手段を有する為、光源から照射され、偏
光ビ−ムスプリッタの偏光分離面により反射される第２
の偏光光を、光束反射手段により、透過光である第１の
偏光光に対し略平行光とした後に、屈折手段によって第
１の偏光光に対し集束光とすることができる。According to the polarization conversion optical system of the projection type liquid crystal display device of the present invention, since it has the refraction means, it is irradiated from the light source and reflected by the polarization splitting surface of the polarization beam splitter.
The polarized light can be converted into a substantially parallel light with respect to the first polarized light, which is the transmitted light, by the light flux reflecting means, and then can be converted into a focused light with respect to the first polarized light by the refracting means.
【０００９】[0009]
【実施例】次に添付図面を参照して本発明による投射型
液晶表示装置の偏光変換光学系の実施例を詳細に説明す
る。図１には、本発明による投射型液晶表示装置の偏光
変換光学系の第１の実施例が示されている。Embodiments of the polarization conversion optical system of the projection type liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the polarization conversion optical system of the projection type liquid crystal display device according to the present invention.
【００１０】本実施例の偏光変換光学系は、光源４から
照射された光を選別分離する偏光ビームスプリッタＰＢ
Ｓ１と、光束反射手段としての反射ミラー２と、位相変
換手段としての位相差板３と、屈折手段としての三角プ
リズム５とから構成されている。なお、本実施例では光
源４から照射される略平行ビームの中心位置のビームを
基準光軸としている。The polarization conversion optical system of this embodiment has a polarization beam splitter PB for selectively separating the light emitted from the light source 4.
It is composed of S1, a reflecting mirror 2 as a light beam reflecting means, a phase difference plate 3 as a phase converting means, and a triangular prism 5 as a refracting means. In this embodiment, the beam at the center of the substantially parallel beam emitted from the light source 4 is used as the reference optical axis.
【００１１】ＰＢＳ１は、２枚の偏光分離面が基準光軸
に対してそれぞれ４５度、相互に直角を成して配置さ
れ、光源４から照射される光のｐ偏光光を基準光軸に対
し略平行に透過し、ｓ偏光光を基準光軸に対し略直角に
反射する。The PBS 1 has two polarization splitting surfaces which are arranged at a right angle to each other at 45 degrees with respect to the reference optical axis, and p-polarized light of the light emitted from the light source 4 with respect to the reference optical axis. The light is transmitted substantially in parallel and the s-polarized light is reflected substantially at right angles to the reference optical axis.
【００１２】反射ミラー２は、反射ミラー２の反射面の
基準光軸に対する傾斜角度ａが４５度に設定されてい
る。ＰＢＳ１で分離された基準光軸に対して直角のｓ偏
光光が反射ミラー２に入射されると、このｓ偏光光は傾
斜角度４５度の反射面でその方向が変更され、ＰＢＳ１
で透過されたｐ偏光光に対し、略平行方向に出射され
る。In the reflection mirror 2, the inclination angle a of the reflection surface of the reflection mirror 2 with respect to the reference optical axis is set to 45 degrees. When the s-polarized light that is perpendicular to the reference optical axis separated by the PBS1 is incident on the reflection mirror 2, the direction of the s-polarized light is changed by the reflection surface having an inclination angle of 45 degrees, and the PBS1
The p-polarized light transmitted by is emitted in a substantially parallel direction.
【００１３】位相差板３は、１／２λ板を使用してお
り、反射ミラー２で反射されたｓ偏光光の光軸を回転、
変更させ、ｐ偏光光として出射する。The phase difference plate 3 uses a 1/2 λ plate and rotates the optical axis of the s-polarized light reflected by the reflection mirror 2.
The light is changed and emitted as p-polarized light.
【００１４】尚、光源４は、ランプ４１と凹型の反射鏡
４２とにより構成され、ランプ４１から出射される光
は、反射鏡４２により所定の面積のビームとされてＰＢ
Ｓ１へ照射される。The light source 4 is composed of a lamp 41 and a concave reflection mirror 42, and the light emitted from the lamp 41 is converted into a beam having a predetermined area by the reflection mirror 42, and the light is emitted from the PB.
It is irradiated to S1.
【００１５】三角プリズム５は、位相差板３に隣接して
配設されており、本実施例ではその頂角ｂが３度に設定
されている。三角プリズム５は、位相差板３を通過して
入射された、ｐ偏光光の光軸に対し略平行光であるｓ偏
光光を、基準光軸に接近する方向へ屈折させる。上記の
構成の偏光変換光学系において、光源４からこの光学系
の基準光軸にビームの中心が概略合わせられたビームが
出射され、ＰＢＳ１へ照射される。ＰＢＳ１は偏光分離
面において、入射されたビームのうち、ｐ偏光光を透過
させ、ｓ偏光光を反射する。The triangular prism 5 is arranged adjacent to the retardation plate 3, and in this embodiment, the apex angle b is set to 3 degrees. The triangular prism 5 refracts the s-polarized light, which is incident on the retardation plate 3 and is substantially parallel to the optical axis of the p-polarized light, in a direction approaching the reference optical axis. In the polarization conversion optical system having the above configuration, the light source 4 emits a beam whose center is approximately aligned with the reference optical axis of the optical system, and irradiates the PBS 1. The PBS 1 transmits p-polarized light and reflects s-polarized light of the incident beam on the polarization splitting surface.
【００１６】ＰＢＳ１で反射されたｓ偏光光は、反射ミ
ラー２へ入射され、傾斜角度４５度の反射面でその方向
がｐ偏光光に対して略平行光となるように変更される。
反射ミラー２で反射されたｓ偏光光は、位相差板３で進
相、遅相処理がされてｐ偏光光に変換され、三角プリズ
ム５によって基準光軸に接近する方向に屈折される。The s-polarized light reflected by the PBS 1 is incident on the reflection mirror 2 and is changed so that its direction becomes substantially parallel to the p-polarized light on the reflecting surface having an inclination angle of 45 degrees.
The s-polarized light reflected by the reflection mirror 2 is advanced and retarded by the phase difference plate 3 to be converted into p-polarized light, and refracted by the triangular prism 5 in a direction approaching the reference optical axis.
【００１７】本実施例の偏光変換光学系によれば、上記
のように、反射ミラー２により反射されて、基準光軸に
対して略平行光となったＳ偏光光は、三角プリズム５を
透過することによってＰＢＳ１側に接近するように、即
ち基準光軸に対して集束するように光路を変更するた
め、図５の場合のように反射光がＰＢＳ１へ衝突するこ
とがない。よって光源４から照射されるビームは光路に
障害を受けることがなく、一つの偏光光に統一されて出
射される。これによって光源４から照射される全ビーム
が液晶パネル６０の表示画像の投影に用いられ、投影写
像８０の輝度を向上させる。この光学系により、偏光方
向を揃えた光線をより有効的に使用することが可能とな
り、投射型液晶表示装置の輝度を三角プリズム５を使用
しない従来の偏光変換光学系と比較して約３０％向上さ
せることが可能になる。According to the polarization conversion optical system of the present embodiment, as described above, the S-polarized light which is reflected by the reflection mirror 2 and becomes substantially parallel to the reference optical axis passes through the triangular prism 5. By doing so, the optical path is changed so as to approach the PBS1 side, that is, to focus on the reference optical axis, so that the reflected light does not collide with the PBS1 as in the case of FIG. Therefore, the beam emitted from the light source 4 is not disturbed in the optical path and is emitted as one polarized light. As a result, all the beams emitted from the light source 4 are used to project the display image on the liquid crystal panel 60, and the brightness of the projection map 80 is improved. With this optical system, it is possible to more effectively use light rays having the same polarization direction, and the brightness of the projection type liquid crystal display device is about 30% as compared with the conventional polarization conversion optical system which does not use the triangular prism 5. It will be possible to improve.
【００１８】図２には、本発明による第２の実施例が示
されている。この実施例では、図１の実施例のうち、Ｐ
ＢＳ１、反射ミラー２、および三角プリズム５が一体成
型された一体型偏光ビームスプリッタ１０が使用されて
いる。この実施例における動作および効果については図
１の実施例と同じであるため、その説明を省略する。更
に、一体型偏光ビームスプリッタ１０を使用したことに
より、ＰＢＳ１、反射ミラー２、および三角プリズム５
を個々に配設させた場合に比べ、振動等による微妙なず
れ偏光方向の変化を防止することができるという効果も
ある。FIG. 2 shows a second embodiment according to the present invention. In this embodiment, P of the embodiment of FIG.
The integrated polarization beam splitter 10 in which the BS 1, the reflection mirror 2, and the triangular prism 5 are integrally molded is used. Since the operation and effect of this embodiment are the same as those of the embodiment of FIG. 1, the description thereof will be omitted. Furthermore, by using the integrated polarization beam splitter 10, the PBS 1, the reflection mirror 2, and the triangular prism 5
It is also possible to prevent a slight change in the polarization direction due to vibration or the like, as compared with the case where each is separately arranged.
【００１９】なお、上記実施例は本発明の好適な実施の
一例ではあるが、本発明はこれに限定されるものではな
く、本発明の要旨を逸脱しない範囲において種々変形実
施可能である。例えば、三角プリズム５は、上記実施例
ではその頂角ｂが３度に設定されているが、３度に限ら
ず光源４の特性、あるいは要求される映像の光量分布等
により検討し、設定することが可能である。また、屈折
手段として三角プリズム５を使用したが、三角プリズム
５に限らずフレネルあるいはレンズ等光束を屈折させる
ことができる素子を使用することも可能である。また、
上記実施例では、偏光変換光学系から出射される光束を
ｐ偏光光としたが、ｐ偏光光に限らずｓ偏光光あるいは
（ｓ＋ｐ）／２偏光光等でもよい。Although the above embodiment is an example of a preferred embodiment of the present invention, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, although the apex angle b of the triangular prism 5 is set to 3 degrees in the above embodiment, the apex angle b is not limited to 3 degrees and is set by considering the characteristics of the light source 4, the required light quantity distribution of the image, or the like. It is possible. Further, although the triangular prism 5 is used as the refracting means, not only the triangular prism 5 but also an element capable of refracting a light beam such as a Fresnel or a lens can be used. Also,
In the above embodiment, the light beam emitted from the polarization conversion optical system is p-polarized light, but it is not limited to p-polarized light and may be s-polarized light or (s + p) / 2-polarized light.
【００２０】[0020]
【発明の効果】本発明の投射型液晶表示装置の偏光変換
光学系によれば、偏光ビームスプリッタと位相手段に隣
接して屈折手段を配設したため、偏光方向を揃えた光線
をより有効的に使用することが可能となり、投射型液晶
表示装置の輝度を向上させることが可能になる。According to the polarization conversion optical system of the projection type liquid crystal display device of the present invention, since the refraction means is disposed adjacent to the polarization beam splitter and the phase means, it is possible to more effectively make the light rays whose polarization directions are aligned. It can be used, and the brightness of the projection type liquid crystal display device can be improved.
【図１】本発明の投射型液晶表示装置の偏光変換光学系
の一実施例を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of a polarization conversion optical system of a projection type liquid crystal display device of the present invention.
【図２】本発明の投射型液晶表示装置の偏光変換光学系
の他の実施例を示す構成図である。FIG. 2 is a configuration diagram showing another embodiment of the polarization conversion optical system of the projection type liquid crystal display device of the present invention.
【図３】従来の投射型液晶装置の全体構成を示す構成図
である。FIG. 3 is a configuration diagram showing an overall configuration of a conventional projection type liquid crystal device.
【図４】従来の投射型液晶表示装置の偏光変換光学系の
一例を示す構成図である。FIG. 4 is a configuration diagram showing an example of a polarization conversion optical system of a conventional projection type liquid crystal display device.
【図５】従来の投射型液晶表示装置の偏光変換光学系の
他の例を示す構成図である。FIG. 5 is a configuration diagram showing another example of a polarization conversion optical system of a conventional projection type liquid crystal display device.
１ 偏光ビームスプリッタ（ＰＢＳ） ２ 反射ミラー ３ 位相差板 ４ 光源 ５ 三角プリズム １０ 一体型偏光ビームスプリッタ ４１ 反射鏡 ４２ ランプ 1 Polarizing Beam Splitter (PBS) 2 Reflecting Mirror 3 Phase Difference Plate 4 Light Source 5 Triangular Prism 10 Integrated Polarizing Beam Splitter 41 Reflecting Mirror 42 Lamp
Claims (3)
と第２の偏光光とに分離して出力する投射型液晶表示装
置の偏光変換光学系において、該光学系は、 互いに直交する少なくとも２つの偏光分離面により構成
される偏光ビームスプリッタと、 前記偏光ビームスプリッタの偏光分離面により反射、分
離された前記第２の偏光光の光路を第１の偏光光に対し
て略平行光に反射させる光束反射手段と、 前記光束反射手段により反射された第２の偏光光の偏波
面を回転させ、出力する位相変換手段と、 前記光束反射手段により反射された第２の偏光光を前記
第１の偏光光の光軸に対し集束するように屈折させる少
なくとも１つの屈折手段を有することを特徴とする投射
型液晶表示装置の偏光変換光学系。1. A polarization conversion optical system of a projection type liquid crystal display device, which separates a light beam emitted from a light source into a first polarized light and a second polarized light, and outputs the separated polarized light. A polarization beam splitter composed of at least two polarization splitting surfaces, and an optical path of the second polarized light reflected and split by the polarization splitting surface of the polarization beam splitter into substantially parallel light with respect to the first polarized light. A light flux reflecting means for reflecting the light, a phase converting means for rotating and outputting a polarization plane of the second polarized light reflected by the light flux reflecting means, and a second polarized light reflected by the light flux reflecting means for the second A polarization conversion optical system for a projection type liquid crystal display device, comprising at least one refracting means for refracting so that one polarized light is converged with respect to an optical axis.
射手段、前記位相変換手段、および前記屈折手段が一体
成型されていることを特徴とする請求項１に記載の投射
型液晶表示装置の偏光変換光学系。2. The polarization conversion optics for a projection type liquid crystal display device according to claim 1, wherein the polarization beam splitter, the light flux reflection means, the phase conversion means, and the refraction means are integrally molded. system.
を特徴とする請求項１または２に記載の投射型液晶表示
装置の偏光変換光学系。3. The polarization conversion optical system for a projection type liquid crystal display device according to claim 1, wherein the refracting means is a triangular prism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5316091A JPH07146474A (en) | 1993-11-22 | 1993-11-22 | Polarization converting optical system of projection type liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5316091A JPH07146474A (en) | 1993-11-22 | 1993-11-22 | Polarization converting optical system of projection type liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07146474A true JPH07146474A (en) | 1995-06-06 |
Family
ID=18073145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5316091A Pending JPH07146474A (en) | 1993-11-22 | 1993-11-22 | Polarization converting optical system of projection type liquid crystal display device |
Country Status (1)
| Country | Link |
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| US6022110A (en) * | 1997-07-15 | 2000-02-08 | Nec Corporation | Projection color liquid crystal display apparatus |
| KR101387097B1 (en) * | 2013-04-02 | 2014-04-29 | 유한회사 마스터이미지쓰리디아시아 | Three beam splitting method and a stereoscopic projection using the same |
| WO2015092536A3 (en) * | 2013-12-16 | 2015-11-12 | 유한회사 마스터이미지쓰리디아시아 | Stereoscopic image device having improved brightness and method for providing stereoscopic image |
| US9927691B2 (en) | 2006-09-29 | 2018-03-27 | Reald Inc. | Polarization conversion systems for stereoscopic projection |
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| 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 |
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| CN107422486A (en) * | 2013-04-02 | 2017-12-01 | 瑞尔D股份有限公司 | Stereoscopic image devices |
| CN104272172A (en) * | 2013-04-02 | 2015-01-07 | 斯特立体影像科技有限公司 | Stereoscopic imaging device |
| WO2014163322A1 (en) * | 2013-04-02 | 2014-10-09 | 유한회사 마스터이미지쓰리디아시아 | Stereoscopic imaging device |
| US9958697B2 (en) | 2013-04-02 | 2018-05-01 | Reald Inc. | Stereoscopic image apparatus |
| KR101387097B1 (en) * | 2013-04-02 | 2014-04-29 | 유한회사 마스터이미지쓰리디아시아 | Three beam splitting method and a stereoscopic projection using the same |
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| WO2015092536A3 (en) * | 2013-12-16 | 2015-11-12 | 유한회사 마스터이미지쓰리디아시아 | Stereoscopic image device having improved brightness and method for providing stereoscopic image |
| CN111273456A (en) * | 2013-12-16 | 2020-06-12 | 瑞尔D股份有限公司 | Stereoscopic image device with improved brightness and method of providing stereoscopic image |
| CN105980914B (en) * | 2013-12-16 | 2019-06-21 | 瑞尔D股份有限公司 | The method of the stereoscopic image devices and offer stereo-picture of brightness with raising |
| US10291906B2 (en) | 2013-12-16 | 2019-05-14 | Reald Inc. | Stereoscopic image device having improved brightness and method for providing stereoscopic image |
| US20160301920A1 (en) * | 2013-12-16 | 2016-10-13 | Masterimage 3D Asia, Llc. | Stereoscopic image device having improved brightness and method for providing stereoscopic image |
| CN105980914A (en) * | 2013-12-16 | 2016-09-28 | 斯特立体影像科技有限公司 | Stereoscopic image device having improved brightness and method for providing stereoscopic image |
| US9948925B2 (en) | 2014-03-04 | 2018-04-17 | Reald Inc. | Modulator for stereoscopic image device and stereoscopic image device using same |
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