JPH03259131A - Liquid crystal projecting device - Google Patents
Liquid crystal projecting deviceInfo
- Publication number
- JPH03259131A JPH03259131A JP2056507A JP5650790A JPH03259131A JP H03259131 A JPH03259131 A JP H03259131A JP 2056507 A JP2056507 A JP 2056507A JP 5650790 A JP5650790 A JP 5650790A JP H03259131 A JPH03259131 A JP H03259131A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal panel
- optical system
- projection
- optical axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 78
- 230000003287 optical effect Effects 0.000 claims abstract description 72
- 238000005286 illumination Methods 0.000 claims abstract description 28
- 239000002131 composite material Substances 0.000 claims 1
- 229910052736 halogen Inorganic materials 0.000 abstract 1
- 150000002367 halogens Chemical class 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 230000010287 polarization Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は液晶投影装置、特に液晶パネルの透過光を所定
の投影光学系に入射させ、前記液晶パネルに表示された
光学像を所定のスクリーン上に投影する液晶投影装置に
関するものである。Detailed Description of the Invention [Industrial Application Field] The present invention is a liquid crystal projection device, in particular, allows transmitted light from a liquid crystal panel to enter a predetermined projection optical system, and displays an optical image displayed on the liquid crystal panel on a predetermined screen. This invention relates to a liquid crystal projection device that projects images onto a liquid crystal display.
［従来の技術１
従来より液晶は、低電圧、低消費電力で駆動でき、また
ＬＳＩとの整合性が極めてよく、軽量、薄型化が可能な
表示素子として知られており、また表示面サイズの設計
の自由度が高い。[Conventional technology 1] Liquid crystals have traditionally been known as display elements that can be driven with low voltage and low power consumption, have extremely good compatibility with LSIs, can be made lightweight and thin, and are capable of reducing display surface size. High degree of freedom in design.
さらに、液晶を用いた表示パネル（以下液晶パネルとい
う）は、透過光でも反射光でも表示が可能であるという
特徴を有する。Furthermore, a display panel using liquid crystal (hereinafter referred to as a liquid crystal panel) has the characteristic that display can be performed using either transmitted light or reflected light.
このような利点から、各種電子機器の表示装置など、種
々のデイスプレィシステムに実施されている。Because of these advantages, it has been implemented in various display systems such as display devices for various electronic devices.
［発明が解決しようとする課題］
液晶パネルは、液晶を２枚の透明電極の間で電界を与え
ることにより、所定の方向に配向させることにより、光
学的な透過率を変化させ、表示を行なうものであるが、
原理上ないし構造上の理由から、液晶パネルの法線方向
に対しである角度においで最もコントラストのよい光像
が得られるように設計、製造されている。[Problems to be Solved by the Invention] A liquid crystal panel displays images by applying an electric field between two transparent electrodes to orient liquid crystal in a predetermined direction, thereby changing its optical transmittance. Although it is a thing,
For principle or structural reasons, they are designed and manufactured so that an optical image with the highest contrast can be obtained at a certain angle with respect to the normal direction of the liquid crystal panel.
この最もコントラストのよい光像を得られる角度は、一
般に視野角と呼ばれる。The angle at which an optical image with the best contrast can be obtained is generally called the viewing angle.
一般に、電卓などの機器の液晶パネルでは、士数度〜数
十度程度の範囲でほぼ良好な光像が得られるように設計
されている。In general, liquid crystal panels for devices such as calculators are designed to provide a generally good optical image in the range of a few degrees to several tens of degrees.
ところが、市場に供給されている透過型／反射型の液晶
パネルでは、ある程度の表示コントラストを得るために
は、最低限の角度（数度程度）が要求されていることが
多い。第４図は、−射的なしＣＤパネルの視野角δと、
コントラスとＣｏのある。However, in transmissive/reflective liquid crystal panels supplied on the market, a minimum angle (on the order of several degrees) is often required in order to obtain a certain degree of display contrast. Figure 4 shows - viewing angle δ of the non-optical CD panel;
Contrast and Co.
反射型のアプリケーションでは、ユーザが直接光像を視
認し、その視認角度がパネルの法線方向であることはむ
しろまれなので、それほど大きな問題は生じないが、透
過型のアプリケーションでは不都合がある。In reflective applications, this is not a major problem because it is rather rare for the user to directly view the light image and the viewing angle is in the normal direction of the panel, but in transmissive applications this is a disadvantage.
透過光を用いるアプリケーションには、たとえば液晶プ
ロジェクタがあるが、液晶パネルの透過光を用いて表示
光像を最もコントラストよく表示するためには、液晶パ
ネルに対する照明光の入射角度は、その液晶パネルで決
められた最低の視野角度以上としなければならない。An example of an application that uses transmitted light is a liquid crystal projector, but in order to display a display light image with the highest contrast using the transmitted light of the liquid crystal panel, the angle of incidence of the illumination light on the liquid crystal panel must be determined by the angle of incidence of the illumination light on the liquid crystal panel. The viewing angle must be at least the specified minimum viewing angle.
このため、液晶パネルに表示された光像を投影する光学
系に大きな負担を与えることになる。This places a heavy burden on the optical system that projects the optical image displayed on the liquid crystal panel.
液晶パネルに対してＯｏを越える照明光入射角度をもっ
て投影を行なう光学系の配置としては、まず、投影レン
ズの光軸と液晶パネルからの照明（透過）光の主光線方
向を一致（平行に）させた場合には、もっとも効率はよ
いが、レンズ光軸に対してパネルを傾けた配置となり、
チルト（ア才り）投影となる。したがって、スクリーン
上の投影像に非対称な歪みが生じる。In order to arrange the optical system that projects the illumination light onto the liquid crystal panel with an incident angle exceeding Oo, first, the optical axis of the projection lens and the principal ray direction of the illumination (transmission) light from the liquid crystal panel should be aligned (parallel). Although it is most efficient if the panel is tilted relative to the optical axis of the lens,
This is a tilted projection. Therefore, an asymmetrical distortion occurs in the projected image on the screen.
一方、第５図に示すように、投影光学系のレンズＬＬの
光軸に対して液晶パネル２１を垂直に配置することも考
えられる。この場合には、液晶パネルの像がシフト投影
され、チルト投影の場合のような歪みは発生しない。な
お、第５図において、符号ＬＳは光源、ＬＳＣはコンデ
ンサレンズである。On the other hand, as shown in FIG. 5, it is also conceivable to arrange the liquid crystal panel 21 perpendicularly to the optical axis of the lens LL of the projection optical system. In this case, the image on the liquid crystal panel is projected with a shift, and no distortion occurs as in the case of tilt projection. In addition, in FIG. 5, the symbol LS is a light source, and LSC is a condenser lens.
ビデオプロジェクタなどの場合、像の歪みは商品価値を
左右するので、現在では、上記後者の光学系配置が用い
られている。In the case of video projectors and the like, since image distortion affects the commercial value, the latter optical system arrangement is currently used.
ところが、シフト投影の場合には、第５図のように、レ
ンズの周辺部分しか使用していないので、明るさに関し
て効率のよい光学系とはいえない。従ってこのような構
成では、明るい投影像を得るためには１画角が大きく、
また、ｆナンバーの小さい投影レンズＬが必要となり、
装置の大型化は避けられず、また設計の難易度も増す、
したがって、製造コストも増大することになる。However, in the case of shift projection, as shown in FIG. 5, only the peripheral portion of the lens is used, so it cannot be said that the optical system is efficient in terms of brightness. Therefore, in such a configuration, in order to obtain a bright projected image, one angle of view must be large;
In addition, a projection lens L with a small f number is required,
Increasing the size of the equipment is unavoidable, and the difficulty of designing it also increases.
Therefore, manufacturing costs will also increase.
本発明の課題は、以上の問題を解決し、簡単安価で、光
学的な効率の高い液晶投影装置を提供することにある。An object of the present invention is to solve the above problems and provide a liquid crystal projection device that is simple, inexpensive, and has high optical efficiency.
［課題を解決するための手段１
以上の課題を解決するために、本発明においては、液晶
パネルの透過ないし反射光を所定の投影光学系に入射さ
せ、前記液晶パネルに表示された光字像を所定のスクリ
ーン−１−に投影する液晶投影装置番こおいて、前記液
晶パネルが画成する下面に対し、て所定の入射角度をも
つ照明光を入射する手段と、前記液晶パネルが画成する
平面に対しで、ほぼ垂直に光軸を配置させた投影光学系
と、前記液晶パネルと投影光字系の間の所定位置に配置
された偏角プリズムを有し、前記偏角プリズムを介して
前記投影光学系側からみた前記液晶パネルの照明光の光
軸を前記投影光字系の光軸と一致させＬＨ構成を採用し
た。[Means for Solving the Problems 1] In order to solve the above problems, in the present invention, transmitted or reflected light from a liquid crystal panel is made incident on a predetermined projection optical system, and an optical character image displayed on the liquid crystal panel is a liquid crystal projection device for projecting images onto a predetermined screen -1; means for making illumination light incident at a predetermined angle of incidence onto a lower surface defined by the liquid crystal panel; a projection optical system having an optical axis arranged substantially perpendicular to a plane to be projected; and a deflection prism disposed at a predetermined position between the liquid crystal panel and the projection optical system; An LH configuration was adopted in which the optical axis of the illumination light of the liquid crystal panel as viewed from the projection optical system side was made to coincide with the optical axis of the projection optical system.
１作用１
以上の構成によれば、前記偏角プリズムにより、前記液
晶パネルの照明光が投影光学系に正対した位置から入射
させた場合と同じ状態を作り出すことができる。1 Effect 1 According to the above configuration, the deflection prism can create the same state as when the illumination light of the liquid crystal panel is made to enter the projection optical system from a position directly facing the projection optical system.
一方、液晶パネルに対する照明光は光像のコントラスト
が最も良好な角度に保たれる。On the other hand, the illumination light for the liquid crystal panel is maintained at an angle that provides the best contrast of the optical image.
［実施例１
以下、図面に示す実施例に基づき１本発明な詳細１．二
説明する１、
第１図（Ａ）は、本発明を採用し７だ液晶投影装置の要
部の構成を示している。[Example 1] Hereinafter, details of the present invention will be explained based on the embodiment shown in the drawings. 2. Explanation 1. FIG. 1(A) shows the configuration of the main parts of a liquid crystal projection device employing the present invention.
図においで符号１１は液晶パネルで、投影光学系のレン
ズＩ、の光軸に対し２゛ｃ直角にバマル面が配置されて
いる。In the figure, reference numeral 11 denotes a liquid crystal panel, and a Bamaru surface is arranged at a right angle of 2°c to the optical axis of lens I of the projection optical system.
液晶パネル１１は、δなる入側角度で昭明し、たとき、
最もコントラストの良好な画像が得られるものであり、
第１図に右いて照明光の入射方向は液晶パネル１１の法
線に対しでこの入射角度りをているものとＪる。The liquid crystal panel 11 is illuminated at an entrance angle of δ, and when
This provides the image with the best contrast,
As shown on the right in FIG. 1, the direction of incidence of the illumination light is assumed to be at this angle of incidence with respect to the normal line of the liquid crystal panel 11.
一方、投影レンズ１．に対して、第５図のように液晶パ
ネル】１を配置し、シフト投影を行った場合、光学系の
効率が低下するので、本実施例では、液晶パネル１１と
投影系のフィールドレンズＬ２の間に偏角プリズム１２
を配置し、投影レンズｌ、１．フィールドレンズ１．２
の光軸と、これら投影レンズ側から偏角プリズム１２を
介しでみた液晶パネル１１の照明（透過）光の主光線の
到来方向を一致させる。On the other hand, projection lens 1. On the other hand, if the liquid crystal panel 11 is arranged as shown in FIG. 5 and shift projection is performed, the efficiency of the optical system will decrease, so in this embodiment, the liquid crystal panel 11 and the field lens L2 of the projection system are An angle prism 12 between
and projecting lenses l, 1. field lens 1.2
and the arrival direction of the chief ray of the illumination (transmission) light of the liquid crystal panel 11 viewed from the projection lens side through the deflection prism 12 are made to coincide.
このような構成によれば、投影レンズ１−１の側からみ
れば、液晶パネル１１は投影レンズ１．の有効なイメー
ジサークルの中心に位置しているのと同じことになり、
従来例のように、光量低ｔ゛の問題も生じることがない
。According to such a configuration, when viewed from the projection lens 1-1 side, the liquid crystal panel 11 is the same as the projection lens 1-1. It is the same as being located at the center of the effective image circle of
Unlike the conventional example, the problem of low light amount t' does not occur.
従来例以上の明るさでスクリーンＳ十に液晶パネル１１
の表示光像を鮮明に投影できる。また、従来と同等の明
るさが確保できればよいのなら、従来よりｆナンバーの
小さいレンズ、あるいは、光量の少ない照明系を用いる
ことができ、コストダウン、装置の小型軽量化、低消費
電力化が図れる。LCD panel 11 on screen S10 with brightness higher than conventional example
A display light image can be projected clearly. In addition, if you only need to ensure the same brightness as before, you can use a lens with a smaller f-number or a lighting system with less light intensity than before, which will reduce costs, make the device smaller and lighter, and lower power consumption. I can figure it out.
なお、偏角プリズム１２の頂角θと、液晶パネル１１に
対する好ましい照明光入射角度δ、および偏角プリズム
１２の屈折率ｎの関係は、次のように示される（頂角θ
が小さい場合）。The relationship between the apex angle θ of the deflection prism 12, the preferable illumination light incident angle δ with respect to the liquid crystal panel 11, and the refractive index n of the deflection prism 12 is shown as follows (vertex angle θ
is small).
δ＝（ｎ−１）θ
たとえば、最適な照明光入射角度がδ＝３°、偏角プリ
ズム１２（ガラス）の屈折率ｎ ＝ １．５２とすると
、偏角ブリズｈ ｌ ２のｍ角ｅ Ｌ：ｊｔ、 ９７°
となる。δ=(n-1)θ For example, if the optimal illumination light incident angle is δ=3° and the refractive index of the polarization prism 12 (glass) n = 1.52, then m angle e of the polarization prism h l 2 L:jt, 97°
becomes.
なお、第１図（Ａ）では、フィールドレンズＬ。In addition, in FIG. 1(A), the field lens L is shown.
２と偏角プリズム１２を別体と［７かが、これらを第１
図（Ｂ）に示すように一体化しても良い。この場合、偏
角プリズム部分Ｘとフィールドｌノン１部分Ｙは、貼り
合せ、あるいは一体素材からの研磨などにより一体化さ
れる。この構成では、組立時に位置決めすべき部品の点
数が減少し、実装上有利である。2 and the declination prism 12 are separate parts [7], but these are the first
They may be integrated as shown in Figure (B). In this case, the deflection prism portion X and the field non-1 portion Y are integrated by bonding or polishing from an integral material. This configuration reduces the number of parts that must be positioned during assembly, which is advantageous in terms of mounting.
なお、以上では、液晶パネル１．１と投影レンズＬの量
器４：偏角プリズム１２を配置する構成を例示したが、
第２図に示すように、液晶パネル１１の表面あるいは裏
面のガラスへ−ス１．８（１９）にスラント角を与えて
、これを偏角プリズムとして機能させるようにしでもよ
い。このような構成によって、照明、表示、光学系全体
の構成をより簡略化することができる。なお、第２図に
おいて、符号Ｉ５は液晶を保持するガラス板、１６．１
７は互いに偏光方向が直角な偏光板である。In addition, although the configuration in which the liquid crystal panel 1.1 and the meter 4 of the projection lens L and the deflection prism 12 are arranged is illustrated above,
As shown in FIG. 2, a slant angle may be given to the glass base 1.8 (19) on the front or back surface of the liquid crystal panel 11, so that it functions as a deflection prism. With such a configuration, the configuration of the illumination, display, and optical system as a whole can be further simplified. In addition, in FIG. 2, the reference numeral I5 indicates a glass plate holding the liquid crystal, 16.1
7 are polarizing plates whose polarization directions are perpendicular to each other.
第２図のような、ＬＣＤパネル一体型の偏角ブＪズムを
用いた場合、第３図のような構成が考えられる。ここで
は、ＬＣＤ素子の表裏のガラス板を偏角プリズム１８ａ
、１８ｂとし、偏角プリズム１８ａで一旦ＬＣＤパネル
１１に対する照明光入射角度にコントラスト確保に必要
な角度（前記のδ）を得た後、偏角プリズム１８ｂによ
り、再度投影系光軸に対して平行な光線に戻している。When using an LCD panel-integrated deflection beam as shown in FIG. 2, a configuration as shown in FIG. 3 can be considered. Here, the front and back glass plates of the LCD element are connected to the deflection prism 18a.
, 18b, and once the incident angle of the illumination light to the LCD panel 11 is set to the angle (above δ) necessary for ensuring contrast, the angle of incidence of the illumination light to the LCD panel 11 is once obtained by the deflection prism 18b, and then the angle is set parallel to the optical axis of the projection system again by the deflection prism 18b. It is returning to the rays of light.
このような構成によれば、照明系の光軸と、投影系の光
軸を、ＬＣＤパネル１１の前後でほぼ平行（−直線上）
に配置することができる。According to such a configuration, the optical axis of the illumination system and the optical axis of the projection system are approximately parallel (on a - straight line) before and after the LCD panel 11.
can be placed in
従って、第３図の構成によれば、投影系の効率のみなら
ず、照明系の効率を向上させることができ、＠記実施例
よりも有利な条件で投影が可能である。当然、第１図（
Ａ）と同じ投影系であればより明るい投影像が得られ、
あるいはレンズ口径を小さくするなどの節約が可能とな
る。又、各光学素子配設のための空間も節約できる。Therefore, according to the configuration shown in FIG. 3, not only the efficiency of the projection system but also the efficiency of the illumination system can be improved, and projection can be performed under more advantageous conditions than the embodiment described in @. Naturally, Figure 1 (
If the projection system is the same as in A), a brighter projected image can be obtained.
Alternatively, savings can be made by reducing the lens aperture. Moreover, the space for arranging each optical element can also be saved.
以上では、ＬＣＤパネル１枚を用いる投影装置を考えた
が、例えば、カラー投影装置では、３原色の画像をそれ
ぞれ別の（３枚の）ＬＣＤパネルを用いて表示し、その
透過光像を所定の光学系を介して合成する。このような
装置でも、個々のＬＣＤパネルに前述の各実施例の構成
を何ら変更することな〈実施できるのはいうまでもない
。In the above, we considered a projection device that uses one LCD panel, but for example, in a color projection device, images of three primary colors are displayed using separate (three) LCD panels, and the transmitted light image is displayed at a predetermined level. are synthesized through an optical system. It goes without saying that even in such a device, the configuration of each of the above-described embodiments can be implemented without making any changes to the individual LCD panels.
また、ビームスプリッタを用いて照明光をＬＣＤパネル
に入射し、ＬＣＤパネル裏面の反射板での反射光（ＬＣ
Ｄパネルの透過光）を偏光ビームスプリッタ２２、投影
レンズを介して投影する構成（日経メカニカル１９８９
年１２月２５日号）があるが、このような投影系におい
ても、第３図に示すような偏角プリズムをＬＣＤパネル
の前後に配置することで、照明系、投影系の効率を損な
わずにＬＣＤパネルのコントラストが良好となる照明光
入射角度を確保できる。In addition, illumination light is incident on the LCD panel using a beam splitter, and the reflected light (LC
A configuration in which the transmitted light of panel D) is projected through a polarizing beam splitter 22 and a projection lens (Nikkei Mechanical 1989
(December 25, 2013 issue), but even in such a projection system, by placing deflection prisms in front and behind the LCD panel as shown in Figure 3, the efficiency of the illumination system and projection system can be maintained. It is possible to secure an angle of incidence of illumination light at which the contrast of the LCD panel is good.
［発明の効果］
以上から明らかなように１本発明によれば、液晶パネル
の透過ないし反射光を所定の投影光学系に入射させ、前
記液晶パネルに表示された光学像を所定のスクリーン上
に投影する液晶投影装置において、前記液晶パネルが画
成する平面に対して所定の入射角度をもつ照明光を入射
する手段と、前記液晶パネルが画成する平面に対して、
ほぼ垂直に光軸を配置させた投影光学系と、前記液晶パ
ネルと投影光学系の間の所定位置に配置された偏角プリ
ズムを有し、前記偏角プリズムを介して前記投影光学系
側からみた前記液晶パネルの照明光の光軸を前記投影光
学系の光軸と一致させた構成を採用しているので、前記
偏角プリズムにより、前記液晶パネルの照明光が投影光
学系に正対した位置から入射させた場合と同じ状態を作
り出すことができるとともに、一方、液晶パネルに対す
る照明光は光像のコントラストが最も良好な角度に保た
れるので、投影光学系の性能を有効に利用でき、小型軽
量かつ簡単安価、また低消費電力の照明系により、明る
（かつ鮮明な画像を投影できるという優れた効果がある
。[Effects of the Invention] As is clear from the above, according to the present invention, transmitted or reflected light from a liquid crystal panel is made incident on a predetermined projection optical system, and an optical image displayed on the liquid crystal panel is projected onto a predetermined screen. In a liquid crystal projection device for projecting, means for making illumination light incident at a predetermined angle of incidence with respect to a plane defined by the liquid crystal panel;
It has a projection optical system with an optical axis arranged almost vertically, and a deflection prism arranged at a predetermined position between the liquid crystal panel and the projection optical system, and from the projection optical system side through the deflection prism. Since the optical axis of the illumination light of the liquid crystal panel is aligned with the optical axis of the projection optical system, the polarization prism allows the illumination light of the liquid crystal panel to directly face the projection optical system. It is possible to create the same condition as when the light is incident from a certain position, and on the other hand, the illumination light to the liquid crystal panel is maintained at an angle that provides the best contrast of the light image, so the performance of the projection optical system can be effectively utilized. It is small, lightweight, simple and inexpensive, and has the excellent effect of projecting bright (and clear) images thanks to its low power consumption lighting system.
第１図（Ａ）は本発明を採用した液晶投影装置の要部を
示した説明図、第１図（Ｂ）は本発明の異なる実施例を
示した説明図、第２図は本発明の異なる実施例における
液晶パネルを示した説明図、第３図は本発明の異なる実
施例における液晶投影装置を示した説明図、第４図は液
晶パネルの視野角とコントラストの関係を示す線図、第
５図は従来の液晶投影装置の構成を示した説明図である
。
Ｓ−・スクリーン Ｌ・・・投影レンズ１１．
２１・・・液晶パネル １２・・−偏角プリズム１５−
・ガラス板 １６．１７・・−偏光板１８．１
９−・ベースFIG. 1(A) is an explanatory diagram showing the main parts of a liquid crystal projection device adopting the present invention, FIG. 1(B) is an explanatory diagram showing a different embodiment of the present invention, and FIG. An explanatory diagram showing a liquid crystal panel in different embodiments, FIG. 3 is an explanatory diagram showing a liquid crystal projection device in a different embodiment of the present invention, and FIG. 4 is a diagram showing the relationship between viewing angle and contrast of a liquid crystal panel. FIG. 5 is an explanatory diagram showing the configuration of a conventional liquid crystal projection device. S- Screen L... Projection lens 11.
21...Liquid crystal panel 12...-deflection prism 15-
・Glass plate 16.17...-Polarizing plate 18.1
9-Base
Claims (1)
、前記液晶パネルに表示された光学像を所定のスクリー
ン上に投影する液晶投影装置において、 前記液晶パネルが画成する平面に対して所定の入射角度
をもつ所定の照明手段の照明光を入射する手段と、 前記液晶パネルが画成する平面に対して、ほぼ垂直に光
軸を配置させた投影光学系と、 前記液晶パネルと投影光学系の間の所定位置に配置され
た偏角プリズムを有し、 前記偏角プリズムを介して前記投影光学系側からみた前
記液晶パネルの照明光の光軸を前記投影光学系の光軸と
一致させたことを特徴とする液晶投影装置。 ２）前記投影光学系の光軸と、前記照明手段の光軸がほ
ぼ平行に配置され、しかも前記液晶パネルに対する所定
の入射角度を保つよう、前記偏角プリズムが前記液晶パ
ネルの前後に配置されることを特徴とする請求項第１項
に記載の液晶投影装置。 ３）前記偏角プリズムが、投影光学系内の所定素子と一
体化されることを特徴とする請求項第１項または第２項
に記載の液晶投影装置。 ４）前記偏角プリズムが、前記液晶パネルを構成する単
数または複数の所定素子と一体化されることを特徴とす
る請求項第１項または第２項に記載の液晶投影装置。 ５）前記液晶パネル、偏角プリズムおよび照明手段が複
数設けられ、各液晶パネルの表示像の合成像をスクリー
ンに投影する投影光学系を有することを特徴とする請求
項第１項から第３項までのいずれか１項に記載の液晶投
影装置。[Scope of Claims] 1) A liquid crystal projection device that causes transmitted light of a liquid crystal panel to enter a predetermined projection optical system and projects an optical image displayed on the liquid crystal panel onto a predetermined screen, wherein the liquid crystal panel a projection optical system having an optical axis arranged substantially perpendicular to the plane defined by the liquid crystal panel; , a deflection prism disposed at a predetermined position between the liquid crystal panel and the projection optical system, and the optical axis of the illumination light of the liquid crystal panel viewed from the projection optical system side through the deflection prism is projected. A liquid crystal projection device characterized by aligning the optical axis of an optical system. 2) The deflection prisms are arranged in front of and behind the liquid crystal panel so that the optical axis of the projection optical system and the optical axis of the illumination means are arranged substantially parallel to each other and maintain a predetermined angle of incidence with respect to the liquid crystal panel. The liquid crystal projection device according to claim 1, characterized in that: 3) The liquid crystal projection device according to claim 1 or 2, wherein the deflection prism is integrated with a predetermined element within a projection optical system. 4) The liquid crystal projection device according to claim 1 or 2, wherein the deflection prism is integrated with one or more predetermined elements constituting the liquid crystal panel. 5) Claims 1 to 3 are characterized in that a plurality of the liquid crystal panels, deflection prisms, and illumination means are provided, and a projection optical system is provided for projecting a composite image of the display images of the respective liquid crystal panels onto a screen. The liquid crystal projection device according to any one of the preceding items.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2056507A JPH03259131A (en) | 1990-03-09 | 1990-03-09 | Liquid crystal projecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2056507A JPH03259131A (en) | 1990-03-09 | 1990-03-09 | Liquid crystal projecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03259131A true JPH03259131A (en) | 1991-11-19 |
Family
ID=13029041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2056507A Pending JPH03259131A (en) | 1990-03-09 | 1990-03-09 | Liquid crystal projecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03259131A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05257114A (en) * | 1992-03-13 | 1993-10-08 | Hitachi Ltd | Liquid crystal projection type display |
| JPH0579530U (en) * | 1992-03-24 | 1993-10-29 | 日本ビクター株式会社 | Display system optics |
| US5371559A (en) * | 1991-11-15 | 1994-12-06 | Matsushita Electric Industrial Co., Ltd. | Light valve image projection apparatus |
| US5612797A (en) * | 1994-05-14 | 1997-03-18 | U.S. Philips Corporation | Liquid crystal projection display systems |
| US20140078429A1 (en) * | 2007-05-10 | 2014-03-20 | Stanley Electric Co., Ltd. | Vertical alignment type liquid crystal display apparatus having improved display uniformity |
-
1990
- 1990-03-09 JP JP2056507A patent/JPH03259131A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5371559A (en) * | 1991-11-15 | 1994-12-06 | Matsushita Electric Industrial Co., Ltd. | Light valve image projection apparatus |
| JPH05257114A (en) * | 1992-03-13 | 1993-10-08 | Hitachi Ltd | Liquid crystal projection type display |
| JPH0579530U (en) * | 1992-03-24 | 1993-10-29 | 日本ビクター株式会社 | Display system optics |
| US5612797A (en) * | 1994-05-14 | 1997-03-18 | U.S. Philips Corporation | Liquid crystal projection display systems |
| US20140078429A1 (en) * | 2007-05-10 | 2014-03-20 | Stanley Electric Co., Ltd. | Vertical alignment type liquid crystal display apparatus having improved display uniformity |
| US9207471B2 (en) * | 2007-05-10 | 2015-12-08 | Stanley Electric Co., Ltd. | Vertical alignment type liquid crystal display apparatus having improved display uniformity |
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