JP2005099093A - Polarization separating device and projection display device - Google Patents

Polarization separating device and projection display device Download PDF

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JP2005099093A
JP2005099093A JP2003329514A JP2003329514A JP2005099093A JP 2005099093 A JP2005099093 A JP 2005099093A JP 2003329514 A JP2003329514 A JP 2003329514A JP 2003329514 A JP2003329514 A JP 2003329514A JP 2005099093 A JP2005099093 A JP 2005099093A
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light
polarization
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color
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Terumi Ohara
輝美 大原
Togo Nishiyama
東郷 西山
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Victor Company of Japan Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a polarization separating means maintaining polarization separating performance even in the case of high temperature, and also to provide a projection display device providing high image quality even in the case of applying a high-luminance illumination light source by using the polarization separating means. <P>SOLUTION: White non-polarization light emitted from a lamp 61 is supplied to a color component separation part 10. In the color component separation part 10, a P polarized light component out of light transmitted through a 1st color polarizer 12 is transmitted through a reflection type polarizing plate for color separation 11 and supplied to a 2nd color separation and composition part 30, and an S polarization component is reflected by the polarizing film surface of the reflection type polarizing plate for color separation plate 11, emitted in a direction orthogonal to incident light, transmitted through a reflection type polarizing plate 13 and supplied to a 1st color component separation and composition part 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、反射型偏光板を用いた偏光分離装置、及び投射表示装置に関する。   The present invention relates to a polarization separation device using a reflective polarizing plate, and a projection display device.

カラー投射表示装置は、白色光から3原色光に係るR(赤)、G(緑)、B(青)の色光を分解して対応色の空間光変調素子に導き、当該空間光変調素子で映像信号に応じて光変調された色光を合成して投射し、スクリーン上にカラー映像を表示させるものである。   The color projection display device decomposes R (red), G (green), and B (blue) color lights related to the three primary colors from white light and leads them to the corresponding spatial light modulation elements. Color light modulated according to the video signal is synthesized and projected to display a color video on the screen.

カラー投射表示装置は、それに適用される空間光変調素子の種類によって次にあげる3種類に大別される。透過型の空間光変調素子を適用したもの、反射型の空間光変調素子を適用したもの、またDMD(Digital Mirror Device)を適用したものがある。   Color projection display devices are roughly classified into the following three types depending on the type of spatial light modulation element applied thereto. There are those to which a transmissive spatial light modulator is applied, those to which a reflective spatial light modulator is applied, and those to which a DMD (Digital Mirror Device) is applied.

透過型の空間光変調素子及びDMDは、光学構成が比較的簡単にできるために小型化が容易であるが高解像度化に難がある。一方、反射型の空間光変調素子は高解像度化に有利であるが光学構成が複雑となるために小型化に難がある。   The transmissive spatial light modulator and DMD can be reduced in size easily because the optical configuration can be made relatively simple, but it is difficult to achieve high resolution. On the other hand, the reflective spatial light modulator is advantageous for high resolution, but it is difficult to reduce the size because the optical configuration is complicated.

特に、反射型の空間光変調素子を適用した投射表示装置は、空間光変調素子に照射される入射光と当該空間光変調素子で変調された反射光とを分離するために偏光ビームスプリッタを必要とする。高コントラストを実現するためには一つの空間光変調素子に対して、通常2つ以上の偏光ビームスプリッタを作用させるために、これが反射型の投射表示装置の光学構成を複雑にしていた。   In particular, a projection display device to which a reflective spatial light modulation element is applied requires a polarization beam splitter to separate incident light irradiated on the spatial light modulation element and reflected light modulated by the spatial light modulation element. And In order to achieve high contrast, two or more polarization beam splitters are normally applied to one spatial light modulator, which complicates the optical configuration of the reflective projection display device.

このような反射型の空間光変調素子における光学構成の課題を解決し構成を小型化した色分解合成光学系が、提案されている(例えば、特許文献1参照。)。この色分解合成光学系は、複数の偏光ビームスプリッタを至近距離に配置して、反射型液晶変調素子を効率よく配置し、反射ミラー等による光路の回りこみ導入の必要がない光学系を構成することにより小型化を達成している。   There has been proposed a color separation / synthesis optical system that solves the problem of the optical configuration of such a reflective spatial light modulator and has a reduced size (for example, see Patent Document 1). This color separation / synthesis optical system forms an optical system in which a plurality of polarizing beam splitters are arranged at a close distance, a reflection type liquid crystal modulation element is efficiently arranged, and there is no need to introduce an optical path wraparound by a reflection mirror or the like. This achieves miniaturization.

また偏光ビームスプリッタに相当する偏光分離手段として、反射型偏光板を用いる提案が、ワイヤーグリッド偏光子として開示されている(例えば、特許文献2参照。)。これは、従来赤外線、マイクロ波、レーダの分野で用いられていたワイヤーグリッド偏光子を可視光帯域であるディスプレイシステムに適用するものである。   In addition, a proposal using a reflective polarizing plate as a polarization separating means corresponding to a polarizing beam splitter is disclosed as a wire grid polarizer (see, for example, Patent Document 2). In this method, a wire grid polarizer that has been used in the fields of infrared rays, microwaves, and radars is applied to a display system in the visible light band.

特開2000−284228公報JP 2000-284228 A 特表2002−514778公報Special Table 2002-514778

ところで、近年の投影画面の大型化、高輝度化の市場要求が出てきている。そのためには、照明用光源を大型化する方法が用いられる。照明光源の大型化は、発生熱量の増大によりそれを構成する光学部品の温度上昇を招き、特に、照明用光源から最初に光束が入射する偏光分離手段を構成する偏光ビームスプリッターが高温になり、それを構成する硝材の複屈折等により投射画面にシェーディングが発生したりコントラスト比が低下するという問題があった。   By the way, in recent years, there has been a market demand for larger projection screens and higher brightness. For this purpose, a method of increasing the size of the illumination light source is used. Increasing the size of the illumination light source causes an increase in the amount of heat generated, leading to an increase in the temperature of the optical components constituting it, and in particular, the polarization beam splitter constituting the polarization separation means on which the light beam first enters from the illumination light source becomes high temperature, There is a problem that shading occurs on the projection screen or the contrast ratio decreases due to the birefringence of the glass material constituting the material.

また、ワイヤーグリッド偏光子を用い偏光分離手段の冷却を行うことが考えられるが、特許文献2にあるような偏光子を構成するガラス基板の入射光側に、偏光素子を配列するワイヤーグリッド偏光子の場合、偏光分離した偏光光がガラス基板を透過するため、入射光により発熱温度上昇でガラス基板に発生する複屈折の影響を除去できないという問題があった。   Further, although it is conceivable to cool the polarization separating means using a wire grid polarizer, a wire grid polarizer in which a polarizing element is arranged on the incident light side of a glass substrate constituting the polarizer as in Patent Document 2. In this case, since polarized polarized light is transmitted through the glass substrate, there is a problem that the influence of birefringence generated on the glass substrate due to an increase in heat generation temperature due to incident light cannot be removed.

本発明は、以上の点に鑑みなされたもので、高温になっても偏光分離性能を維持する偏光分離装置を提供すると共に、この偏光分離手段を用いて高輝度照明光源を適用しても高画質を得られる投射表示装置を提供することを、更には色分解合成光学系の冷却を容易にした投写表示装置を提供する目的とする。   The present invention has been made in view of the above points, and provides a polarization separation device that maintains polarization separation performance even at a high temperature, and also provides a high brightness illumination light source using this polarization separation means. An object of the present invention is to provide a projection display device that can obtain image quality, and further to provide a projection display device that facilitates cooling of the color separation / synthesis optical system.

本発明は、上記課題を解決するために、以下の1)〜3)記載の手段よりなる。
すなわち、
1)光透過性基板の片面上に反射型偏光膜を形成した反射型偏光板を複数枚用いて、白色あるいは3原色光のうち特定の色光の不定偏光光束を入射し、前記不定偏光光束中のS偏光成分を入射光の進行方向に対して直角に反射し、他の成分は入射光の進行経路に対し透過させる偏光分離装置であって、
前記光透過性基板側から光束を入射し前記反射型偏光膜でS偏光成分を反射する第1の反射型偏光板と、前記反射されたS偏光光の進行経路に、前記光透過性基板側を入射側としS偏光光を透過させる第2の反射型偏光板を設けたことを特徴とする偏光分離装置。
2)光透過性基板の片面上に反射型偏光膜を形成した反射型偏光板を複数枚用いて、白色あるいは3原色光のうち特定の色光の不定偏光光束を入射し、前記不定偏光光束中のS偏光成分を入射光の進行方向に対して直角に反射し、他の成分は入射光の進行経路に対し透過させる偏光分離装置であって、
前記反射型偏光膜側から光束を入射し前記反射型偏光膜でS偏光成分を反射する第1の反射型偏光板と、前記第1の反射型偏光板を透過したP偏光光の進行経路に、前記光透過性基板側を入射側としP偏光光を透過させる平行ニコル状態に第2の反射型偏光板を設けたことを特徴とする偏光分離装置。
3)光源と色分解合成光学系と第1〜3の反射型空間光変調素子と投射レンスとからなる投射表示装置において、
前記色分解合成光学系は、
前記光源から出射され所定の偏光状態となされた照明光が入射され、前記照明光を、各原色光の偏光状態に応じて、第1及び第2の原色光を含む光束と第3の原色光を含む光束とに分離させ、これら光束を互いに直交する2方向に出射する偏光分離手段と、
前記偏光分離手段により分離された光束のうち、第1及び第2の原色光を含む光束が入射され、この光束を各原色光の偏光状態に応じて互いに直交する2方向に分離させて第1及び第2の反射型空間光変調素子にそれぞれ入射させるとともに、これら第1及び第2の反射型空間光変調素子において変調されて反射された反射光束を合成して、前記偏光分離手段からの光束の入射方向に対して直交する方向に出射する第1の偏光分離合成手段と、
前記偏光分離手段により分離された光束のうち、第3の原色光を含む光束が入射され、この光束を第3の反射型空間光変調素子に入射させるとともに、この第3の反射型空間光変調素子において変調されて反射された反射光束を、前記偏光分離手段からの光束の入射方向に対して直交する方向に出射する第2の偏光分離合成手段と、
前記第1の偏光分離合成手段からの出射光束及び前記第2の偏光分離合成手段からの出射光束が入射され、これら光束を合成して、前記投射レンズに入射させる偏光合成手段と、
を具備し、
前記偏光分離手段、前記第1の偏光分離合成手段、前記第2の偏光分離合成手段及び前記偏光合成手段のうち、少なくとも前記偏光分離手段は、請求項1又は請求項2記載の偏光分離装置で構成したことを特徴とする投射表示装置。
In order to solve the above problems, the present invention comprises the following means 1) to 3).
That is,
1) Using a plurality of reflective polarizing plates having a reflective polarizing film formed on one side of a light-transmitting substrate, an indefinitely polarized light beam of a specific color of white or three primary colors is incident, and the indefinitely polarized light beam Is a polarization separation device that reflects the S-polarized light component at right angles to the traveling direction of the incident light, and transmits the other component to the traveling path of the incident light,
A first reflective polarizing plate that receives a light beam from the light transmissive substrate side and reflects an S-polarized light component by the reflective polarizing film; and a path of the reflected S-polarized light on the light transmissive substrate side A polarization separation device characterized in that a second reflective polarizing plate that transmits S-polarized light is provided.
2) Using a plurality of reflective polarizing plates each having a reflective polarizing film formed on one side of a light-transmitting substrate, an indefinitely polarized light beam of a specific color of white or three primary colors is incident, and the indefinitely polarized light beam Is a polarization separation device that reflects the S-polarized light component at right angles to the traveling direction of the incident light, and transmits the other component to the traveling path of the incident light,
In the traveling path of the P-polarized light that has passed through the first reflective polarizing plate and the first reflective polarizing plate that reflects the S-polarized component by the reflective polarizing film by entering the light beam from the reflective polarizing film side A polarization separation device, characterized in that a second reflective polarizing plate is provided in a parallel Nicol state in which the light transmissive substrate side is an incident side and P-polarized light is transmitted.
3) In a projection display device comprising a light source, a color separation / synthesis optical system, first to third reflective spatial light modulation elements, and a projection lens,
The color separation / synthesis optical system includes:
Illumination light emitted from the light source and having a predetermined polarization state is incident, and the illumination light is converted into a light beam including first and second primary color light and third primary color light according to the polarization state of each primary color light. Polarization separating means for separating the luminous flux into two directions orthogonal to each other;
Of the light beams separated by the polarization separation means, a light beam including the first and second primary color lights is incident, and the light beams are separated into two directions orthogonal to each other according to the polarization state of each primary color light to be the first. And the reflected light beams modulated and reflected by the first and second reflective spatial light modulation elements, and combined with the reflected light beams from the polarization separation means. First polarized light separating and combining means for emitting light in a direction orthogonal to the incident direction of
Of the light beams separated by the polarization separating means, a light beam containing the third primary color light is incident, and this light beam is incident on the third reflective spatial light modulation element, and this third reflective spatial light modulation is performed. A second polarization separation / combination means for emitting a reflected light beam modulated and reflected by the element in a direction orthogonal to the incident direction of the light flux from the polarization separation means;
A polarization beam combining unit that receives the light beam emitted from the first polarization beam splitting and combining unit and the light beam beam output from the second polarization beam splitting and combining unit, combines the beam beams, and enters the projection lens;
Comprising
3. The polarization separation device according to claim 1, wherein at least the polarization separation unit of the polarization separation unit, the first polarization separation / combination unit, the second polarization separation / combination unit, and the polarization synthesis unit. A projection display device characterized by comprising.

入射光を反射型偏光板の光透過性ガラス基板側から入射させ、P偏光光を透過かつS偏光光を反射、さらに次の反射型偏光板の光透過性ガラス基板側から入射させ透過S偏光光を作成する。このようにP偏光光、及びS偏光光の出射を反射型偏光板の偏光膜側から行うことにより、入射光による発熱温度上昇で光透過性ガラス基板に発生する複屈折の影響を除去できるため、消光比の大きなPS偏光光、及びS偏光光を得ることができる偏光分離装置を提供できる。
また、発熱による複屈折の影響が少ないため光透過性ガラス基板に安価な白板硝子等が使用でき、安価で高性能な偏光分離装置を提供できる。
Incident light is incident from the light-transmitting glass substrate side of the reflective polarizing plate, P-polarized light is transmitted and S-polarized light is reflected, and further, the incident light is incident from the light-transmitting glass substrate side of the next reflective polarizing plate. Create light. In this way, by emitting P-polarized light and S-polarized light from the polarizing film side of the reflective polarizing plate, it is possible to eliminate the influence of birefringence that occurs in the light-transmitting glass substrate due to the rise in heat generation temperature due to incident light. It is possible to provide a polarization separation device capable of obtaining PS polarized light and S polarized light having a large extinction ratio.
Further, since there is little influence of birefringence due to heat generation, an inexpensive white glass or the like can be used for the light-transmitting glass substrate, and an inexpensive and high-performance polarization separation device can be provided.

この偏光分離装置を投射表示装置の光学ユニットで一番高温となる色分離部に用いることにより、投射画面にシェーディングが発生したりコントラスト比が低下することがない高画質な投射表示装置を提供することができる。
また、反射型偏光板を用いた偏光分離装置で投射表示装置の光学ユニットを構成するため、冷却風を送る空間を確保でき各部の温度を適正に維持した投射表示装置を提供することができる。
By using this polarized light separation device for the color separation portion that is the highest temperature in the optical unit of the projection display device, a high-quality projection display device in which shading does not occur on the projection screen or the contrast ratio does not decrease is provided. be able to.
In addition, since the optical unit of the projection display device is configured by the polarization separation device using the reflective polarizing plate, it is possible to provide a projection display device in which a space for sending cooling air can be secured and the temperature of each part is properly maintained.

以下、本発明に係る偏光分離装置及び投射表示装置の発明を実施するための最良の形態につき、好ましい実施例により説明する。
図1は、本発明の第1の実施例に適用される偏光分離装置を示す模式図である。図2は、第2の実施例に適用される偏光分離装置を示す模式図である。図3は、図2の第2実施例の変形例である。
Hereinafter, the best mode for carrying out the invention of the polarized light separation device and the projection display device according to the present invention will be described with reference to preferred embodiments.
FIG. 1 is a schematic diagram showing a polarization beam splitting apparatus applied to the first embodiment of the present invention. FIG. 2 is a schematic diagram showing a polarization beam splitting apparatus applied to the second embodiment. FIG. 3 is a modification of the second embodiment of FIG.

図1に示すように、実施例1に適用される偏光分離装置は、同図左側から不定偏光光あるいは色により偏光を制御された入射光を入射させる。そして光学ガラス基板の上に偏光反射膜1aを形成した第1の反射型偏光板1に、その光学ガラス基板側から入射させる。
入射光に含まれたP偏光光は、第1の反射型偏光板1を透過し透過P偏光光となって出射される。一方入射光に含まれたS偏光光は、反射型偏光板1の偏光反射膜1aで反射され垂直方向(図面上方)に出射される。更に、第2の反射型偏光板2に光学ガラス基板側から入射され、S偏光光を透過させる偏光面に配置された偏光反射膜2aを透過し反射S偏光光となって垂直方向に出射される。
したがって第1、第2の反射型偏光板を構成する光学ガラス基板による複屈折の影響を偏光膜で除去して、入射された不定偏光光をP偏光光とS偏光光とに分離し出射するようにしている。
As shown in FIG. 1, the polarization beam splitter applied to the first embodiment makes indefinitely polarized light or incident light whose polarization is controlled by color enter from the left side of the figure. And it is made to inject from the optical glass substrate side into the 1st reflective polarizing plate 1 which formed the polarizing reflective film 1a on the optical glass substrate.
The P-polarized light contained in the incident light passes through the first reflective polarizing plate 1 and is emitted as transmitted P-polarized light. On the other hand, the S-polarized light contained in the incident light is reflected by the polarization reflection film 1a of the reflective polarizing plate 1 and emitted in the vertical direction (upward in the drawing). Further, the light is incident on the second reflective polarizing plate 2 from the optical glass substrate side, passes through the polarizing reflection film 2a disposed on the polarization plane that transmits the S-polarized light, and is emitted in the vertical direction as reflected S-polarized light. The
Therefore, the influence of birefringence by the optical glass substrate constituting the first and second reflective polarizing plates is removed by the polarizing film, and the incident indefinitely polarized light is separated into P-polarized light and S-polarized light and emitted. I am doing so.

図2に示すように、実施例2に適用される偏光分離装置は、不定偏光光あるいは色により偏光を制御された入射光を第3の反射型偏光板3の偏光反射膜3a側から入射させる。そして入射光に含まれたS偏光光は垂直方向に反射分離される。
一方入射光に含まれたP偏光光は、第3の反射型偏光板3を透過し、第4の反射型偏光板4の光学ガラス基板側から入射しP偏光光を通過させる配置に設定した反射型偏光膜4aを通過し出射される。
したがって第3、第4の反射型偏光板を構成する光学ガラス基板による複屈折の影響を偏光膜で除去して、入射された不定偏光光をP偏光光とS偏光光とに分離し出射するようにしている。
As shown in FIG. 2, the polarization separation device applied to the second embodiment causes indefinitely polarized light or incident light whose polarization is controlled by color to be incident from the side of the polarizing reflective film 3 a of the third reflective polarizing plate 3. . Then, the S-polarized light contained in the incident light is reflected and separated in the vertical direction.
On the other hand, the P-polarized light included in the incident light is transmitted through the third reflective polarizing plate 3 and is incident from the optical glass substrate side of the fourth reflective polarizing plate 4 so as to pass the P-polarized light. The light passes through the reflective polarizing film 4a and is emitted.
Therefore, the influence of birefringence by the optical glass substrate constituting the third and fourth reflective polarizing plates is removed by the polarizing film, and the incident indefinitely polarized light is separated into P-polarized light and S-polarized light and emitted. I am doing so.

図3は、前述の実施例2における第一の反射型偏光板3によって垂直方向に反射出射されたS偏光光を、第5の反射型偏光板5の光学ガラス基板側から入射しS偏光光を通過させる配置に設定した反射膜5aを透過後出射するようにして、反射光に残留するP偏光光を除去して出射させている。
したがって第4、第5の反射型偏光板を構成する光学ガラス基板による複屈折の影響を偏光膜で除去して、入射された不定偏光光をP偏光光とS偏光光とに分離し出射するようにしている。
FIG. 3 shows that S-polarized light reflected and emitted in the vertical direction by the first reflective polarizing plate 3 in Example 2 described above is incident from the optical glass substrate side of the fifth reflective polarizing plate 5 and is S-polarized light. The P-polarized light remaining in the reflected light is removed and emitted so as to be emitted after being transmitted through the reflective film 5a set to pass the light.
Therefore, the influence of birefringence caused by the optical glass substrates constituting the fourth and fifth reflective polarizing plates is removed by the polarizing film, and the incident indefinitely polarized light is separated into P-polarized light and S-polarized light and emitted. I am doing so.

図4は、実施例4,5,6に適用される投射表示装置を示す概略構成図である。図5は、実施例4に適用される投射表示装置の主要部を示す概略構成図である。図6は、実施例5に適用される投射表示装置の主要部を示す概略構成図である。図7は、実施例6に適用される投射表示装置の主要部を示す概略構成図である。
図4に示すように、投射表示装置は筐体99と筐体99内に収められた照明光源部6と色分離合成部7と投写レンズ8で構成された投写ユニットと電源・映像信号処理部9で構成されている。
FIG. 4 is a schematic configuration diagram showing a projection display device applied to the fourth, fifth, and sixth embodiments. FIG. 5 is a schematic configuration diagram illustrating a main part of a projection display device applied to the fourth embodiment. FIG. 6 is a schematic configuration diagram illustrating a main part of a projection display device applied to the fifth embodiment. FIG. 7 is a schematic configuration diagram illustrating a main part of a projection display device applied to the sixth embodiment.
As shown in FIG. 4, the projection display device includes a housing 99, an illumination light source unit 6 housed in the housing 99, a color separation / combination unit 7, a projection unit composed of a projection lens 8, and a power source / video signal processing unit. 9.

図5に投写ユニットのさらに詳しい構成図を示し説明する。同図に示すように、投写ユニットは、光源部6と色成分分離部10と第1の色成分分離合成部20と第2の色分離合成部30と色合成部40と投写レンズ8とから構成されている。
光源部6は、ランプ61と偏光板62とを備えている。偏光板62はランプ61から出射された白色無偏光光のうち、おおよそP偏光成分のみあるいはS偏光成分のみを透過し色成分分離部10に供給される。
色分離部10は色分離用反射型偏光板11とその色分離PBSの光源部6側の主面に対向配置された第1のカラー偏光子12と第一の色分離合成部20側に反射型偏光板13を備えている。
光源部6から供給された偏光光は、第1のカラー偏光子12で白色光のうち、所望の波長域を部分的に偏光方向を90度回転させて色分離用反射型偏光板11に透過供給される。
色分離用反射型偏光板11では、第1のカラー偏光子12を透過する光のうちP偏光成分を透過し第2の色分離合成部30に導かれる。S偏光成分は、色分離用反射型偏光板11の偏光膜面で反射され入射光と直行する方向に出射され、反射型偏光板13を透過し第1の色成分分離合成部20に導かれる。
FIG. 5 shows a detailed configuration diagram of the projection unit. As shown in the figure, the projection unit includes a light source unit 6, a color component separation unit 10, a first color component separation / synthesis unit 20, a second color separation / synthesis unit 30, a color synthesis unit 40, and the projection lens 8. It is configured.
The light source unit 6 includes a lamp 61 and a polarizing plate 62. The polarizing plate 62 transmits only the P-polarized component or the S-polarized component of the white non-polarized light emitted from the lamp 61 and supplies the light to the color component separation unit 10.
The color separation unit 10 is reflected on the color separation reflective polarizing plate 11 and the first color polarizer 12 disposed opposite to the main surface of the color separation PBS on the light source unit 6 side and on the first color separation composition unit 20 side. A mold polarizing plate 13 is provided.
The polarized light supplied from the light source unit 6 is transmitted through the color separation reflective polarizing plate 11 by partially rotating the polarization direction of the desired wavelength region by 90 degrees out of white light by the first color polarizer 12. Supplied.
In the color separation reflective polarizing plate 11, the P-polarized component of the light transmitted through the first color polarizer 12 is transmitted and guided to the second color separation / combination unit 30. The S-polarized component is reflected by the polarizing film surface of the color separation reflective polarizing plate 11, is emitted in a direction perpendicular to the incident light, passes through the reflective polarizing plate 13, and is guided to the first color component separation / synthesis unit 20. .

第1の色分離合成部20は分離合成PBS21と、入射光が分離合成PBS21の反射面で反射して達する主面側に第1の反射型液晶変調素子22とを備えている。色分離部10から供給されたS偏光成分は、分離合成PBS21の反射面で反射され反射型液晶変調素子22に供給される。
第1の反射型液晶変調素子22に供給された光成分は、投写する画像に応じて偏光を制御され反射される。投写画像が明るい画素素子では入射光が90度回転されて反射され、暗い画素素子では偏光面はそのままで反射される。すなわち、第1の反射型液晶変調素子22に供給されたS偏光光は画像に応じてP偏光光となって反射し、分離合成用PBS21の反射面で反射し色成分合成部40に供給される。偏光を制御されなかったS偏光成分は、分離合成用PBS21の反射面を透過して色分離部10へ戻される。
The first color separation / combination unit 20 includes a separation / combination PBS 21 and a first reflection type liquid crystal modulation element 22 on the main surface side where incident light is reflected by the reflection surface of the separation / combination PBS 21. The S-polarized component supplied from the color separation unit 10 is reflected by the reflection surface of the separation / combination PBS 21 and supplied to the reflective liquid crystal modulation element 22.
The light component supplied to the first reflective liquid crystal modulation element 22 is reflected with its polarization controlled according to the image to be projected. In a pixel element with a bright projected image, incident light is rotated by 90 degrees and reflected, and in a dark pixel element, the polarization plane is reflected as it is. That is, the S-polarized light supplied to the first reflective liquid crystal modulation element 22 is reflected as P-polarized light according to the image, reflected by the reflection surface of the separation / combination PBS 21, and supplied to the color component synthesis unit 40. The The S-polarized component whose polarization has not been controlled passes through the reflection surface of the separation / combination PBS 21 and is returned to the color separation unit 10.

第二の色分離合成部30は色分離部10側の主面に対向配置された第2のカラー偏光子32と分離合成PBS31と、入射光が分離合成PBS31を透過して達する主面側に第2の反射型液晶変調素子33と、分離合成PBS21の反射面で反射して達する主面側に第3の反射型液晶変調素子34とを備えている。色分離部10の色分離用反射型偏光板11を透過したP偏光光は、第2のカラー偏光子32で所望の波長域を部分的に偏光方向を90度回転させて分離合成用PBS31に透過供給される。カラー偏光子32で90度偏光面を回転された光成分はS偏光となり分離合成用PBS31の反射面では反射し第3の反射型液晶変調素子34に供給される。   The second color separation / combination unit 30 has a second color polarizer 32 and a separation / combination PBS 31 arranged opposite to the main surface on the color separation unit 10 side, and a main surface side where incident light passes through the separation / combination PBS 31 and reaches. The second reflection type liquid crystal modulation element 33 and the third reflection type liquid crystal modulation element 34 are provided on the main surface side which is reflected by the reflection surface of the separation / combination PBS 21. The P-polarized light that has passed through the color separation reflective polarizing plate 11 of the color separation unit 10 is rotated by the second color polarizer 32 in a desired wavelength region by partially rotating the polarization direction by 90 degrees to the separation / combination PBS 31. Permeated supply. The light component rotated about the 90-degree polarization plane by the color polarizer 32 becomes S-polarized light, is reflected by the reflection surface of the separation / combination PBS 31, and is supplied to the third reflective liquid crystal modulation element 34.

一方、第3のカラー偏光子32を透過しただけのP偏光成分は、分離合成用PBS31の反射面を透過し第2の反射型液晶変調素子33に供給される。第2の反射型液晶変調素子33と第3の反射型液晶変調素子34に供給された光成分は、投写する画像に応じて偏光を制御され反射される。投写画像が明るい画素素子では入射光が90度回転されて反射され、暗い画素素子では偏光面はそのままで反射される。すなわち、第2の反射型液晶変調素子33に供給されたP偏光光は画像に応じてS偏光光となって反射し、分離合成用PBS31の反射面で反射され色合成部40に供給される。偏光を制御されなかったP偏光成分は、分離合成用PBS31の反射面を透過して色分離部10さらに光源部6へ戻される。
第3の反射型液晶変調素子34に供給されたS偏光光は画像に応じてP偏光光となって反射し、分離合成用PBS31の反射面を透過して色合成部40に供給される。偏光を制御されなかったS偏光成分は、分離合成用PBS31の反射面で反射して色分離部10さらに光源部6へ戻される。
On the other hand, the P-polarized component that has just passed through the third color polarizer 32 passes through the reflection surface of the separation / combination PBS 31 and is supplied to the second reflective liquid crystal modulation element 33. The light components supplied to the second reflective liquid crystal modulation element 33 and the third reflective liquid crystal modulation element 34 are reflected with their polarization controlled according to the image to be projected. In a pixel element with a bright projected image, incident light is rotated by 90 degrees and reflected, and in a dark pixel element, the polarization plane is reflected as it is. That is, the P-polarized light supplied to the second reflective liquid crystal modulation element 33 is reflected as S-polarized light according to the image, reflected by the reflection surface of the separation / combination PBS 31, and supplied to the color synthesis unit 40. . The P-polarized component whose polarization is not controlled passes through the reflection surface of the separation / combination PBS 31 and is returned to the color separation unit 10 and the light source unit 6.
The S-polarized light supplied to the third reflective liquid crystal modulation element 34 is reflected as P-polarized light according to the image, passes through the reflection surface of the separation / combination PBS 31, and is supplied to the color synthesis unit 40. The S polarization component whose polarization is not controlled is reflected by the reflection surface of the separation / combination PBS 31 and returned to the color separation unit 10 and the light source unit 6.

色合成部40は、合成用PBS41と第二の色分離合成部20に対向する主面に第三のカラー偏光子42と、第三の色分離合成部30に対向する主面に第四のカラー偏光子43とを備えている。第1の色分離合成部20から供給されたP偏光信号成分は第三のカラー偏光子42で偏光面を90°回転されS偏光光となり、合成用PBS41の偏光反射面で反射され投射レンズ8側に出射される。   The color synthesizing unit 40 includes a third color polarizer 42 on the main surface facing the combining PBS 41 and the second color separation / synthesis unit 20, and a fourth surface on the main surface facing the third color separation / synthesis unit 30. And a color polarizer 43. The P-polarized signal component supplied from the first color separation / combination unit 20 is rotated by 90 ° in the polarization plane by the third color polarizer 42 to become S-polarized light, reflected by the polarization reflection surface of the PBS 41 for synthesis, and reflected by the projection lens 8. Emitted to the side.

一方第2の色分離合成部30から供給される第2の反射型液晶変調素子33からのS偏光信号成分は、第4のカラー偏光子43で偏光面を90°回転されP偏光光となり合成用PBS41の偏光膜を透過しそのまま投射レンズ8側に出射される。第3の反射型液晶変調素子34から供給されるP偏光信号成分は、第4のカラー偏光子43を透過しさらに合成用PBS41の偏光膜を透過しそのまま投射レンズ8側に出射される。   On the other hand, the S-polarized signal component from the second reflective liquid crystal modulation element 33 supplied from the second color separation / synthesis unit 30 is rotated by 90 ° by the fourth color polarizer 43 to become P-polarized light. The light is transmitted through the polarizing film of the PBS 41 and is emitted to the projection lens 8 as it is. The P-polarized signal component supplied from the third reflective liquid crystal modulation element 34 passes through the fourth color polarizer 43 and further passes through the polarizing film of the combining PBS 41 and is emitted to the projection lens 8 side as it is.

実施例4では、色合成部40に偏光ビームスプリッター(PBS41)と第3、第4のカラー偏光子を用いて色合成部40を構成したが、ダイクロイックミラープリズムのみで色合成部を構成することもできる。
合成用PBS41の位置にダイクロイックミラープリズムを配置し、第2の色分離合成部から入射された画像光を反射し、第2の色分離合成部から入射された光は透過合成し、投写レンズ8に導きスクリーン(図示せず)に投写結像させる方法でも同じである。
In the fourth embodiment, the color synthesizing unit 40 is configured by using the polarization beam splitter (PBS41) and the third and fourth color polarizers in the color synthesizing unit 40. However, the color synthesizing unit is configured only by the dichroic mirror prism. You can also.
A dichroic mirror prism is disposed at the position of the combining PBS 41, reflects the image light incident from the second color separation / combination unit, and transmits and combines the light incident from the second color separation / combination unit. This is the same for the method of guiding the light to the screen (not shown) and projecting it on the screen (not shown).

次に図6を用いて実施例5について説明する。同図に示すように、投写ユニットは、光源部6と色成分分離部10と第1の色成分分離合成部20と第2の色成分分離合成部30と色合成部40と投写レンズ8とから構成されている。光源部6は、ランプ61と偏光板62とを備えている。偏光板62はランプ61から出射された白色不定偏光光のうち、おおよそP偏光成分のみあるいはS偏光成分のみを透過し色成分分離部10に供給される。   Next, Example 5 will be described with reference to FIG. As shown in the figure, the projection unit includes a light source unit 6, a color component separation unit 10, a first color component separation / synthesis unit 20, a second color component separation / synthesis unit 30, a color synthesis unit 40, and a projection lens 8. It is composed of The light source unit 6 includes a lamp 61 and a polarizing plate 62. The polarizing plate 62 transmits only the P-polarized component or the S-polarized component of the white indefinitely polarized light emitted from the lamp 61 and supplies it to the color component separating unit 10.

色分離部10は色分離用反射型偏光板11とその色分離PBSの光源部6側の主面に対向配置された第1のカラー偏光子12とを備えている。光源部6から供給された偏光光は、第1のカラー偏光子12で白色光のうち、所望の波長域を部分的に偏光方向を90度回転させて色分離用反射型偏光板11にガラス基板面から透過供給される。色分離用反射型偏光板11では、第1カラー偏光子12の透過光のうちP偏光成分を透過し第2の色分離合成部30に導かれる。S偏光成分は、色分離用反射型偏光板11の偏光膜面で反射され入射光と直行する方向に出射され、第1の色成分分離合成部20に導かれる。   The color separation unit 10 includes a reflective polarizing plate 11 for color separation and a first color polarizer 12 disposed to face the main surface of the color separation PBS on the light source unit 6 side. The polarized light supplied from the light source unit 6 is formed on the reflective polarizing plate 11 for color separation by partially rotating the polarization direction of the desired wavelength region by 90 degrees out of white light by the first color polarizer 12. Permeated and supplied from the substrate surface. In the color separation reflective polarizing plate 11, the P-polarized light component of the transmitted light of the first color polarizer 12 is transmitted and guided to the second color separation / combination unit 30. The S-polarized component is reflected by the polarizing film surface of the color separation reflective polarizing plate 11 and emitted in a direction perpendicular to the incident light, and is guided to the first color component separation / combination unit 20.

第1の色分離合成部20はと、第2カラー偏光子25と、入射光が分離合成反射偏光板23を透過して達する主面に入射色成分に合わせた第1の波長板24と第1の反射型液晶変調素子22とを備えている。色成分分離部10から供給されたS偏光成分は、第2カラー偏光子25で偏光面を90°回転(λ/2波長板でも可)され、P偏光光として分離合成反射偏光板23のガラス基板面から入射・透過して第1の波長板24と第1の反射型液晶変調素子22とに供給される。
第1の反射型液晶変調素子22に供給された光成分は、投射する画像に応じて偏光を制御され反射される。投射画像が明るい画素素子では入射光が90度回転されて反射され、暗い画素素子では偏光面はそのままで反射される。すなわち、第1の反射型液晶変調素子22に供給されたP偏光光は画像に応じてS偏光光となって反射し、分離合成反射偏光板23の反射面で反射し色成分合成部40に供給される。偏光を制御されなかったP偏光成分は、分離合成反射偏光板23の反射面を透過して色分離部10へ戻される。
The first color separation / combination unit 20, the second color polarizer 25, the first wave plate 24 matched to the incident color component on the principal surface where incident light passes through the separation / synthesis reflection polarizing plate 23, and the first wavelength plate 24 1 reflective liquid crystal modulation element 22. The S-polarized component supplied from the color component separation unit 10 is rotated by 90 ° (or a λ / 2 wavelength plate) by the second color polarizer 25 to rotate the plane of polarization. The light is incident / transmitted from the substrate surface and is supplied to the first wave plate 24 and the first reflective liquid crystal modulation element 22.
The light component supplied to the first reflective liquid crystal modulation element 22 is reflected with its polarization controlled according to the image to be projected. In a pixel element with a bright projected image, incident light is rotated by 90 degrees and reflected, and in a dark pixel element, the polarization plane is reflected as it is. That is, the P-polarized light supplied to the first reflective liquid crystal modulation element 22 is reflected as S-polarized light according to the image, reflected by the reflection surface of the separation / combination reflective polarizing plate 23, and reflected on the color component synthesis unit 40. Supplied. The P-polarized light component whose polarization has not been controlled passes through the reflection surface of the separation / synthesis reflection polarizing plate 23 and is returned to the color separation unit 10.

第2の色分離合成部30は色分離部10側の主面に対向配置された第3のカラー偏光子32と分離合成反射偏光板35と、入射光が分離合成反射偏光板35を透過して達する主面側に第2波長板37と第2反射型液晶変調素子と33分離合成反射偏光板35の反射面で反射して達する主面側に第3波長板36との第3反射型液晶変調素子34とを備えている。色分離部10の色分離用反射型偏光板11を透過したP偏光光は、第3のカラー偏光子32で所望の波長域を部分的に偏光方向を90度回転させて分離合成反射偏光板35に透過供給される。第3カラー偏光子32で90度偏光面を回転された光成分はS偏光となり分離合成反射偏光板35の反射面では反射して、第3の反射型液晶変調素子34に供給される。   The second color separation / combination unit 30 includes a third color polarizer 32 and a separation / combination reflection / polarization plate 35 disposed opposite to the main surface on the color separation unit 10 side, and incident light passes through the separation / combination reflection / polarization plate 35. The third reflection type of the third wave plate 36 on the main surface side which is reflected by the reflection surface of the second wave plate 37, the second reflection type liquid crystal modulation element 33, and the separation / separation reflection polarizing plate 35 on the main surface side to reach. And a liquid crystal modulation element 34. The P-polarized light that has passed through the color separation reflective polarizing plate 11 of the color separation unit 10 is separated and synthesized by the third color polarizer 32 by partially rotating the polarization direction of the desired wavelength region by 90 degrees. Permeated to 35. The light component whose polarization plane is rotated by 90 ° by the third color polarizer 32 becomes S-polarized light, is reflected by the reflection surface of the separation / synthesis reflective polarizing plate 35, and is supplied to the third reflective liquid crystal modulation element 34.

一方、第3のカラー偏光子32を透過しただけのP偏光成分は、分離合成反射偏光板35の反射面を透過して、第2の反射型液晶変調素子33に供給される。第2の反射型液晶変調素子33と第3の反射型液晶変調素子34とに供給された光成分は、投写する画像に応じて偏光を制御され反射される。投写画像が明るい画素素子では入射光が90度回転されて反射され、暗い画素素子では偏光面はそのままで反射される。すなわち、第2の反射型液晶変調素子33に供給されたP偏光光は画像に応じてS偏光光となって反射し、分離合成反射偏光板35の反射面で反射され色成分合成部40に供給される。偏光を制御されなかったP偏光成分は、分離合成反射偏光板35の反射面を透過して色分離部10さらに光源部6へ戻される。   On the other hand, the P-polarized light component that has just passed through the third color polarizer 32 passes through the reflection surface of the separation / synthesis reflective polarizer 35 and is supplied to the second reflective liquid crystal modulation element 33. The light component supplied to the second reflective liquid crystal modulation element 33 and the third reflective liquid crystal modulation element 34 is reflected with its polarization controlled in accordance with the image to be projected. In a pixel element with a bright projected image, incident light is rotated by 90 degrees and reflected, and in a dark pixel element, the polarization plane is reflected as it is. That is, the P-polarized light supplied to the second reflective liquid crystal modulation element 33 is reflected as S-polarized light in accordance with the image, reflected by the reflection surface of the separation / combination reflective polarizing plate 35, and reflected on the color component synthesis unit 40. Supplied. The P-polarized light component whose polarization has not been controlled passes through the reflection surface of the separation / synthesis reflection polarizing plate 35 and is returned to the color separation unit 10 and the light source unit 6.

第3の反射型液晶変調素子34に供給されたS偏光光は画像に応じてP偏光光となって反射し、分離合成反射偏光板35の反射面を透過して色成分合成部40に供給される。偏光を制御されなかったS偏光成分は、分離合成反射偏光板35の反射面で反射して色分離部10さらに光源部6へ戻される。色合成部40は、合成用PBS41と第2の色分離合成部30に対向する主面に第4カラー偏光子43と、投射レンズ8に対向する主面に第5カラー偏光子44と偏光板45を備えている。第1の色分離合成部20から供給されたS偏光信号成分は合成用PBS41の偏光反射面で反射され投射レンズ8側に出射される。このとき色分離合成部20からの色成分帯域の偏光面を第5カラー偏光子44で90°回転させP偏光光として偏光板45を透過させている。   The S-polarized light supplied to the third reflective liquid crystal modulation element 34 is reflected as P-polarized light according to the image, passes through the reflection surface of the separation / combination reflective polarizing plate 35, and is supplied to the color component synthesis unit 40. Is done. The S polarization component whose polarization is not controlled is reflected by the reflection surface of the separation / synthesis reflection polarizing plate 35 and returned to the color separation unit 10 and the light source unit 6. The color synthesis unit 40 includes a fourth color polarizer 43 on the main surface facing the PBS for synthesis 41 and the second color separation / synthesis unit 30, and a fifth color polarizer 44 and a polarizing plate on the main surface facing the projection lens 8. 45. The S-polarized signal component supplied from the first color separation / combination unit 20 is reflected by the polarization reflection surface of the combining PBS 41 and emitted to the projection lens 8 side. At this time, the polarization plane of the color component band from the color separation / combination unit 20 is rotated by 90 ° by the fifth color polarizer 44 and transmitted through the polarizing plate 45 as P-polarized light.

一方、第2の色分離合成部30から供給される第2の反射型液晶変調素子33からのS偏光信号成分は、第4のカラー偏光子43で偏光面を90°回転されP偏光光となり合成用PBS41の偏光膜を透過しそのまま投射レンズ8側に出射される。   On the other hand, the S-polarized signal component from the second reflective liquid crystal modulation element 33 supplied from the second color separation / combination unit 30 is rotated by 90 ° by the fourth color polarizer 43 to become P-polarized light. The light passes through the polarizing film of the combining PBS 41 and is output as it is to the projection lens 8 side.

第3の反射型液晶変調素子34から供給されるP偏光信号成分は、第4のカラー偏光子43を透過しさらに合成用PBS41の偏光膜を透過しそのまま投射レンズ8側に出射される。第1,2,3の反射型液晶変調素子22,33,34の前に配置されている、第1,2,3の波長板は、反射型液晶変調素子22,33,34の液晶プレチルト角の偏光状態の補正を行うためのものである。なお、いずれの波長板も各色に対応したλ/4波長板あるいはλ/2波長板を用いる。液晶プレチルト角分の補正は微量でよく、1/10波長以下、さらには1/20波長以下の微量な波長板であるほうが望ましい。
実際の波長板の取り付けにあたり光学軸方向の設定は、反射型液晶変調素子を黒表示状態にし、スクリーンに投影した画像で黒が最も沈んだ状態になるように調整して行う。
The P-polarized signal component supplied from the third reflective liquid crystal modulation element 34 passes through the fourth color polarizer 43 and further passes through the polarizing film of the combining PBS 41 and is emitted to the projection lens 8 side as it is. The first, second, and third wave plates disposed in front of the first, second, and third reflection type liquid crystal modulation elements 22, 33, and 34 are liquid crystal pretilt angles of the reflection type liquid crystal modulation elements 22, 33, and 34, respectively. This is for correcting the polarization state. Each wave plate is a λ / 4 wave plate or a λ / 2 wave plate corresponding to each color. The correction for the liquid crystal pretilt angle may be a very small amount, and it is desirable that the wavelength plate be a very small wavelength plate of 1/10 wavelength or less, and more preferably 1/20 wavelength or less.
In the actual mounting of the wave plate, the setting in the optical axis direction is performed by setting the reflective liquid crystal modulation element to the black display state and adjusting so that the black is the most sinked in the image projected on the screen.

第3の反射型液晶変調素子34と分離合成反射偏光板35の間に配置されているシリンドリカルレンズ81は、反射型液晶変調素子34で反射された投射光が結像系に斜めに入る分離合成反射偏光板35の光学ガラス基板で発生する非点収差を補正するためのレンズである。   The cylindrical lens 81 disposed between the third reflective liquid crystal modulation element 34 and the separation / combination reflective polarizing plate 35 separates and combines the projection light reflected by the reflection liquid crystal modulation element 34 into the imaging system. This is a lens for correcting astigmatism generated in the optical glass substrate of the reflective polarizing plate 35.

次に図7を用いて実施例6について説明する。同図に示すように、実施例6は、図6に示した実施例5の分離反射偏光板11と分離合成反射偏光板23との間にある第2カラー偏光子を外し、分離合成部20と合成部40との間に第5カラー偏光子42を配置したものである。このとき分離合成反射偏光板23は、分離反射偏光板11からのS偏光光を透過する平行ニコルの状態に配置し、第1反射型液晶変調素子22からのP偏光信号成分は反射膜で反射し、合成部40へ出射させる。他は、実施例5と同様の構成である。   Next, Example 6 will be described with reference to FIG. As shown in the figure, the sixth embodiment removes the second color polarizer between the separation reflective polarizer 11 and the separation composite reflection polarizer 23 of the fifth embodiment shown in FIG. The fifth color polarizer 42 is arranged between the synthesizer 40 and the synthesizer 40. At this time, the separation / synthesis reflection polarizing plate 23 is arranged in a parallel Nicol state that transmits the S-polarized light from the separation reflection polarizing plate 11, and the P-polarized signal component from the first reflective liquid crystal modulation element 22 is reflected by the reflection film. Then, the light is emitted to the synthesis unit 40. The other configuration is the same as that of the fifth embodiment.

なお、実施例4〜6においては、偏光分離装置を投射表示装置の光学ユニットで一番高温となる色分離部に用いること、あるいは、第1反射型液晶変調素子22に用いる例を示したが、実施する投射表示装置に応じて、光学ユニットで一番高温となる色分離部及びそれ以外の一部、あるいはすべてのPBSに適用する構成としてもよい。   In Examples 4 to 6, the example in which the polarization separation device is used for the color separation portion that is the highest temperature in the optical unit of the projection display device or the first reflection type liquid crystal modulation element 22 is shown. Depending on the projection display device to be implemented, the optical unit may be applied to the color separation unit that is the highest temperature in the optical unit and some or all of the PBSs.

実施例1に適用される偏光分離装置を示す模式図である。1 is a schematic diagram illustrating a polarization separation device applied to Example 1. FIG. 実施例2に適用される偏光分離装置を示す模式図である。6 is a schematic diagram showing a polarization beam splitting device applied to Example 2. FIG. 実施例3に適用される偏光分離装置を示す模式図である。6 is a schematic diagram showing a polarization beam splitting device applied to Example 3. FIG. 実施例4,5,6に適用される投射表示装置を示す概略構成図である。It is a schematic block diagram which shows the projection display apparatus applied to Example 4, 5, 6. FIG. 実施例4に適用される投射表示装置の主要部を示す概略構成図である。It is a schematic block diagram which shows the principal part of the projection display apparatus applied to Example 4. FIG. 実施例5に適用される投射表示装置の主要部を示す概略構成図である。It is a schematic block diagram which shows the principal part of the projection display apparatus applied to Example 5. FIG. 実施例6に適用される投射表示装置の主要部を示す概略構成図である。It is a schematic block diagram which shows the principal part of the projection display apparatus applied to Example 6. FIG.

符号の説明Explanation of symbols

1,2,3,4,5…反射型偏光板
1a,2a,3a,4a,5a…偏光反射膜
6…照明光源部
7…色分離合成部
8…投射レンズ
9…電源・映像信号処理部
99…筐体
20,30,40…色成分分離合成部
12,25,32,42,43,44…カラー偏光子
22,33,34…反射型液晶変調素子
DESCRIPTION OF SYMBOLS 1, 2, 3, 4, 5 ... Reflective polarizing plate 1a, 2a, 3a, 4a, 5a ... Polarization reflection film 6 ... Illumination light source part 7 ... Color separation synthetic | combination part 8 ... Projection lens 9 ... Power supply and video signal processing part 99... Housing 20, 30, 40... Color component separation / synthesis unit 12, 25, 32, 42, 43, 44... Color polarizer 22, 33, 34.

Claims (3)

光透過性基板の片面上に反射型偏光膜を形成した反射型偏光板を複数枚用いて、白色あるいは3原色光のうち特定の色光の不定偏光光束を入射し、前記不定偏光光束中のS偏光成分を入射光の進行方向に対して直角に反射し、他の成分は入射光の進行経路に対し透過させる偏光分離装置であって、
前記光透過性基板側から光束を入射し前記反射型偏光膜でS偏光成分を反射する第1の反射型偏光板と、前記反射されたS偏光光の進行経路に、前記光透過性基板側を入射側としS偏光光を透過させる第2の反射型偏光板を設けたことを特徴とする偏光分離装置。
Using a plurality of reflective polarizing plates in which a reflective polarizing film is formed on one surface of a light transmissive substrate, an indefinite polarized light beam of a specific color light out of white or three primary colors is incident, and S in the indefinite polarized light beam is incident. A polarization separation device that reflects polarized components perpendicular to the traveling direction of incident light and transmits other components to the traveling path of incident light,
A first reflective polarizing plate that receives a light beam from the light transmissive substrate side and reflects an S-polarized light component by the reflective polarizing film; and a path of the reflected S-polarized light on the light transmissive substrate side A polarization separation device characterized in that a second reflective polarizing plate that transmits S-polarized light is provided.
光透過性基板の片面上に反射型偏光膜を形成した反射型偏光板を複数枚用いて、白色あるいは3原色光のうち特定の色光の不定偏光光束を入射し、前記不定偏光光束中のS偏光成分を入射光の進行方向に対して直角に反射し、他の成分は入射光の進行経路に対し透過させる偏光分離装置であって、
前記反射型偏光膜側から光束を入射し前記反射型偏光膜でS偏光成分を反射する第1の反射型偏光板と、前記第1の反射型偏光板を透過したP偏光光の進行経路に、前記光透過性基板側を入射側としP偏光光を透過させる平行ニコル状態に第2の反射型偏光板を設けたことを特徴とする偏光分離装置。
Using a plurality of reflective polarizing plates in which a reflective polarizing film is formed on one surface of a light transmissive substrate, an indefinite polarized light beam of a specific color light out of white or three primary colors is incident, and S in the indefinite polarized light beam is incident. A polarization separation device that reflects polarized components perpendicular to the traveling direction of incident light and transmits other components to the traveling path of incident light,
In the traveling path of the P-polarized light that has passed through the first reflective polarizing plate and the first reflective polarizing plate that reflects the S-polarized component by the reflective polarizing film by entering the light beam from the reflective polarizing film side A polarization separation device, characterized in that a second reflective polarizing plate is provided in a parallel Nicol state in which the light transmissive substrate side is an incident side and P-polarized light is transmitted.
光源と色分解合成光学系と第1〜3の反射型空間光変調素子と投射レンズとからなる投射表示装置において、
前記色分解合成光学系は、
前記光源から出射され所定の偏光状態となされた照明光が入射され、前記照明光を、各原色光の偏光状態に応じて、第1及び第2の原色光を含む光束と第3の原色光を含む光束とに分離させ、これら光束を互いに直交する2方向に出射する偏光分離手段と、
前記偏光分離手段により分離された光束のうち、第1及び第2の原色光を含む光束が入射され、この光束を各原色光の偏光状態に応じて互いに直交する2方向に分離させて第1及び第2の反射型空間光変調素子にそれぞれ入射させるとともに、これら第1及び第2の反射型空間光変調素子において変調されて反射された反射光束を合成して、前記偏光分離手段からの光束の入射方向に対して直交する方向に出射する第1の偏光分離合成手段と、
前記偏光分離手段により分離された光束のうち、第3の原色光を含む光束が入射され、この光束を第3の反射型空間光変調素子に入射させるとともに、この第3の反射型空間光変調素子において変調されて反射された反射光束を、前記偏光分離手段からの光束の入射方向に対して直交する方向に出射する第2の偏光分離合成手段と、
前記第1の偏光分離合成手段からの出射光束及び前記第2の偏光分離合成手段からの出射光束が入射され、これら光束を合成して、前記投射レンズに入射させる偏光合成手段と、
を具備し、
前記偏光分離手段、前記第1の偏光分離合成手段、前記第2の偏光分離合成手段及び前記偏光合成手段のうち、少なくとも前記偏光分離手段は、請求項1又は請求項2記載の偏光分離装置で構成したことを特徴とする投射表示装置。

In a projection display device comprising a light source, a color separation / synthesis optical system, first to third reflective spatial light modulation elements, and a projection lens,
The color separation / synthesis optical system includes:
Illumination light emitted from the light source and having a predetermined polarization state is incident, and the illumination light is converted into a light beam including first and second primary color light and third primary color light according to the polarization state of each primary color light. Polarization separating means for separating the luminous flux into two directions orthogonal to each other;
Of the light beams separated by the polarization separation means, a light beam including the first and second primary color lights is incident, and the light beams are separated into two directions orthogonal to each other according to the polarization state of each primary color light to be the first. And the reflected light beams modulated and reflected by the first and second reflective spatial light modulation elements, and combined with the reflected light beams from the polarization separation means. First polarized light separating and combining means for emitting light in a direction orthogonal to the incident direction of
Of the light beams separated by the polarization separating means, a light beam containing the third primary color light is incident, and this light beam is incident on the third reflective spatial light modulation element, and this third reflective spatial light modulation is performed. A second polarization separation / combination means for emitting a reflected light beam modulated and reflected by the element in a direction orthogonal to the incident direction of the light flux from the polarization separation means;
A polarization beam combining unit that receives the light beam emitted from the first polarization beam splitting and combining unit and the light beam beam output from the second polarization beam splitting and combining unit, combines the beam beams, and enters the projection lens;
Comprising
3. The polarization separation device according to claim 1, wherein at least the polarization separation unit of the polarization separation unit, the first polarization separation / combination unit, the second polarization separation / combination unit, and the polarization synthesis unit. A projection display device characterized by comprising.

JP2003329514A 2003-09-22 2003-09-22 Polarization separating device and projection display device Pending JP2005099093A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014215332A (en) * 2013-04-23 2014-11-17 独立行政法人情報通信研究機構 Video reading device and video reading method
CN109655457A (en) * 2017-10-11 2019-04-19 住友化学株式会社 The manufacturing method of flaw detection apparatus, defect detecting method and film

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014215332A (en) * 2013-04-23 2014-11-17 独立行政法人情報通信研究機構 Video reading device and video reading method
CN109655457A (en) * 2017-10-11 2019-04-19 住友化学株式会社 The manufacturing method of flaw detection apparatus, defect detecting method and film

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