JPH05113605A - Projection type display device - Google Patents

Projection type display device

Info

Publication number
JPH05113605A
JPH05113605A JP3272699A JP27269991A JPH05113605A JP H05113605 A JPH05113605 A JP H05113605A JP 3272699 A JP3272699 A JP 3272699A JP 27269991 A JP27269991 A JP 27269991A JP H05113605 A JPH05113605 A JP H05113605A
Authority
JP
Japan
Prior art keywords
light
light source
reflector
brightness
optical system
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
Application number
JP3272699A
Other languages
Japanese (ja)
Inventor
Hideaki Mitsutake
英明 光武
Kazumi Kimura
一己 木村
Shigeru Kawasaki
茂 川崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP3272699A priority Critical patent/JPH05113605A/en
Priority to EP92117925A priority patent/EP0545052B1/en
Priority to DE69207362T priority patent/DE69207362T2/en
Publication of JPH05113605A publication Critical patent/JPH05113605A/en
Priority to US08/403,549 priority patent/US5692819A/en
Pending legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Landscapes

  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)

Abstract

PURPOSE:To enable increasing of the brightness at both the center and periphery of a screen by illuminating the peripheral part of a body to be illuminated with the luminous fluxes from two high-brightness light emitting regions. CONSTITUTION:The reverse tracing light from the axial point on the screen is nearly converged to the focus of a reflector 2 by the shape on the exit side of the reflector 2 and a condenser 2'. Then, the illuminating luminous flux having the highest brightness is obtd. on the axial point by disposing the 1st high-brightness region alpha of a light source into the focus of the reflector 2. On the other hand, the partial luminous flux l221 falling to a part of the reverse tracing light from the off-axial point is refracted by a curved surface 2'-b and is converged to the high-brightness region alpha of the light source and the partial luminous flux l221 is made into the illuminating luminous flux of the high brightness. On the other hand, the partial luminous flux l221 does not pass the curved surface 2'-b of the condenser 2' and, therefore, the convergence to the other high-brightness region alpha' of the light source is maintained. The high-brightness region of the illuminating luminous flux of the reverse tracing light from the off-axial point is increased in this way and the illuminance of the image plane is increased.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は投写表示装置、特に液晶
プロジェクタの光源及び照明系を含めた光学系に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display device, and more particularly to an optical system including a light source and an illumination system of a liquid crystal projector.

【０００２】[0002]

【従来の技術】液晶ライトバルブを用いた液晶プロジェ
クタは大画面・高精細表示のための装置として近年注目
されている。液晶プロジェクタの特徴としては、大画面
投影時に重要な表示像の明るさ、及び解像力を各々光源
の高輝度化、液晶ライトバルブの画素数に対して独立に
担わせることが可能な点にあり、ＣＲＴ投写型に比べ、
装置のコンパクトさと相まって今後優位な位置を占める
と予想されている。2. Description of the Related Art A liquid crystal projector using a liquid crystal light valve has recently attracted attention as a device for large-screen / high-definition display. As a feature of the liquid crystal projector, the brightness of the display image, which is important when projecting a large screen, and the resolving power can be independently assigned to the high brightness of the light source and the number of pixels of the liquid crystal light valve, Compared to CRT projection type
Combined with the compactness of the device, it is expected to occupy an advantageous position in the future.

【０００３】図１１は液晶プロジェクタの基本形態を示
す装置構成例である。メタルハライドランプやハロゲン
ランプ等からなる光源１から発光した光束は、光源位置
或いはその近傍に焦点を有する回転放物面からなるリフ
レクタ２で平行光束となり、カットフィルター３で不要
な赤外・紫外光を除去した後、液晶パネル６への照明光
となる。液晶パネル６の前後には各々１枚ずつ偏光板が
配置され、偏光子５、検光子７の機能を持つ。コンデン
サ４は液晶パネル６の照明光を投影レンズ８の入射瞳へ
向けて集光し、光源或いはリフレクタ出射開口部の像を
投影レンズ８の入射瞳上に結像させるものであり、主と
してフィールドレンズとしての役割を果たすものであ
る。ツイステッド・ネマチック液晶（以下ＴＮ液晶と記
す）及びアクティブマトリクス等から構成される液晶パ
ネル６、偏光子５及び検光子７は、周知のように液晶ラ
イトバルブを構成するものである。上記液晶ライトバル
ブを通過した照明光は上記液晶ライトバルブに入力され
る表示信号に応じて変調され、投影レンズ８によって不
図示のスクリーン上に拡大投影される。FIG. 11 is an example of a device configuration showing a basic form of a liquid crystal projector. A light beam emitted from a light source 1 composed of a metal halide lamp or a halogen lamp becomes a parallel light beam by a reflector 2 composed of a paraboloid of revolution having a focal point at or near the light source position, and unnecessary infrared / ultraviolet light is cut off by a cut filter 3. After the removal, it becomes the illumination light for the liquid crystal panel 6. One polarizing plate is provided in front of and behind the liquid crystal panel 6, and functions as a polarizer 5 and an analyzer 7. The condenser 4 condenses the illumination light of the liquid crystal panel 6 toward the entrance pupil of the projection lens 8 and forms an image of the light source or the exit aperture of the reflector on the entrance pupil of the projection lens 8, and is mainly a field lens. To play a role as. The liquid crystal panel 6, which includes a twisted nematic liquid crystal (hereinafter, referred to as TN liquid crystal) and an active matrix, the polarizer 5 and the analyzer 7, constitutes a liquid crystal light valve as is well known. Illumination light that has passed through the liquid crystal light valve is modulated in accordance with a display signal input to the liquid crystal light valve, and is enlarged and projected by a projection lens 8 onto a screen (not shown).

【０００４】また、カラー表示を行う液晶プロジェクタ
としては、液晶パネル６の各画素上に赤・緑・青いずれ
かの色光のみ透過するフィルタをモザイク状に配置した
ものや、上記液晶ライトバルブの前後に色分解・色合成
のためのダイクロイックミラーを配し、各色光に各々１
組の液晶ライトバルブを用いるものが知られている。Further, as a liquid crystal projector for displaying a color, a liquid crystal panel 6 in which a filter for transmitting only red, green, or blue color light is arranged on each pixel in a mosaic shape, or before and after the liquid crystal light valve is used. A dichroic mirror for color separation and color synthesis is placed on each side, and one for each color light.
It is known to use a set of liquid crystal light valves.

【０００５】[0005]

【発明が解決しようとする課題】液晶プロジェクタの特
徴を生かして明るい大画面表示をするためには、先にも
触れた様に発光部の輝度の高い光源が必要である。可視
波長域での発光効率の高い光源として、近年メタルハラ
イドランプが使用される様になっているが、製品例から
見ると１５０Ｗクラスのメタルハライドランプで対角サ
イズ３インチの液晶ライトバルブを照明し、Ｆ４．５の
投影レンズで５０インチに投影した場合、投影像面中心
照度で２００ルクス前後、１００インチに投影した場合
は５０ルクス前後に留まり一般照明下の明るい周囲環境
に於ては未だ不十分な値である。In order to make use of the characteristics of the liquid crystal projector to display a bright large screen, it is necessary to use a light source having a light emitting portion with high brightness as mentioned above. In recent years, metal halide lamps have been used as a light source with high luminous efficiency in the visible wavelength range, but from a product example, a 150W class metal halide lamp illuminates a liquid crystal light valve with a diagonal size of 3 inches. When projected to 50 inches with a F4.5 projection lens, the projected image plane center illuminance is around 200 lux, and when projected to 100 inches, it stays around 50 lux and is still insufficient in a bright ambient environment under general lighting. Value.

【０００６】図１２は代表的なメタルハライドランプの
構造を示したものである。FIG. 12 shows the structure of a typical metal halide lamp.

【０００７】石英からなる透明な管球部１１には両端に
電極１２、１２′が設けられ、リード線１４、１４′を
介して電源と接続される。管内部１３には水銀、ハロゲ
ン化金属等の放電・発光ガスが封入されている。電源か
らは駆形パルス波形をなす交流電流が供給される。Electrodes 12 and 12 'are provided at both ends of a transparent tube portion 11 made of quartz, and are connected to a power source through lead wires 14 and 14'. A discharge / luminescent gas such as mercury or a metal halide is sealed in the tube interior 13. An alternating current having a driving pulse waveform is supplied from the power supply.

【０００８】図１３は上記メタルハライドランプの放電
発光状態を模式的に表したものであり、（ａ）は上記メ
タルハライドランプの２つの電極に対して垂直な方向か
らみた輝度分布を等輝度線で表したもの、（ｂ）は点
ａ、ａ′を結ぶ線分上での輝度分布を表したものであ
る。同図（ａ）に於て、両電極を結ぶ軸ａ、ａ′上及び
その近傍が輝度の高い領域をなし、この軸から離れるに
従って輝度は急速に低下する。同図（ｂ）に示すように
輝度の高い軸領域のうち、両電極端に近接して特に輝度
の高い２つの高輝度域α、α′が存在する。FIG. 13 schematically shows the discharge light emission state of the metal halide lamp, and FIG. 13 (a) shows the luminance distribution viewed from the direction perpendicular to the two electrodes of the metal halide lamp by isoluminance lines. 2B shows the luminance distribution on the line segment connecting the points a and a '. In FIG. 6A, the areas a and a'around the axes a and a'connecting the two electrodes form a high brightness area, and the brightness rapidly decreases as the distance from this axis increases. As shown in FIG. 6B, in the high-luminance axis region, two high-luminance regions α and α ′ having particularly high luminance exist near both electrode ends.

【０００９】図１４は現状の代表的照明系における光線
の集光状況を示すものであり、光学系全体の概略構成図
を示し、投影スクリーン９上の点から投影レンズ８の瞳
を満たす光線を逆方向に追跡した光線（以下逆トレース
光と記す）を示しており、図１５はスクリーン９上の点
Ｐ1 からのメリディオナル断面内での逆トレース光に
ついて光源１近傍での収斂状況を示したものである。FIG. 14 shows the state of light collection in a typical illumination system at present, and shows a schematic configuration diagram of the entire optical system, in which a light beam that fills the pupil of the projection lens 8 from a point on the projection screen 9 is shown. FIG. 15 shows a ray traced in the opposite direction (hereinafter referred to as “inverse trace light”), and FIG. 15 shows a convergence state in the vicinity of the light source 1 with respect to the inverse trace light in the meridional section from the point P 1 on the screen 9. It is a thing.

【００１０】図１５からも分かるように、スクリーン９
上の点Ｐ1 へは光源１の発光域全体からの光が集光して
いる、つまり２つの高輝度域α、α′だけでなくその周
辺の低輝度域からの光も利用している。このような照明
方法はランプの輝度分布の影響を受けにくいという点は
あるが、投影像面の照度の低下を招く。As can be seen from FIG. 15, the screen 9
The light from the entire light emitting area of the light source 1 is condensed to the upper point P 1 , that is, not only the two high brightness areas α and α ′ but also the light from the surrounding low brightness area is used. .. Although such an illumination method is less susceptible to the influence of the luminance distribution of the lamp, it causes a decrease in illuminance on the projection image plane.

【００１１】また、スクリーン９上の周辺部の点Ｐ2 へ
は、高輝度領域α、α′のうち片方からしか光は集光し
ておらず、かつ光源１の発光部からはずれた、つまり実
際には発光していない領域からの光も集光している。従
って、スクリーン９上軸外部（画面周辺部）において像
面照度の著しい低下を生じ、画面上の明るさムラが目立
ってしまう。At the peripheral point P 2 on the screen 9, light is collected from only one of the high-brightness areas α and α'and is deviated from the light emitting portion of the light source 1, that is, The light from the area that does not actually emit light is also collected. Therefore, the image plane illuminance is significantly reduced outside the upper axis of the screen 9 (the peripheral portion of the screen), and the uneven brightness on the screen becomes noticeable.

【００１２】[0012]

【課題を解決するための手段】本発明は上記問題に鑑み
てなされたものであり、メタルハライドランプ等の放電
型ランプの特に輝度の高い発光部を有効に利用する照明
光学系、ひいては画面の中心・周辺共に明るい大画面表
示のできる投写表示装置を提供することを目的とし、本
発明は、第１、第２の高輝度発光領域を有する光源と、
該光源からの光束を被照明体へ向ける照明光学系と、前
記被照明体の像を投影する投影光学系とを有する投写型
表示装置において、前記光源の第１、第２の高輝度発光
領域を前記照明光学系の光軸上に配置し、前記被照明体
上の中心部を前記光源の第１の高輝度発光領域からの光
束で照明し、前記被照明体上の周辺部を前記光源の第
１、第２双方の高輝度発光領域からの光束で照明するよ
うに前記照明光学系を構成したことを特徴とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an illumination optical system that effectively uses a particularly bright light emitting portion of a discharge type lamp such as a metal halide lamp, and thus a center of a screen. An object of the present invention is to provide a projection display device capable of a large-screen display with bright surroundings, and the present invention provides a light source having first and second high-luminance light emitting regions,
In a projection display device having an illumination optical system for directing a light flux from the light source to an illuminated object and a projection optical system for projecting an image of the illuminated object, first and second high-luminance light emitting regions of the light source. Is arranged on the optical axis of the illumination optical system, a central portion on the illuminated body is illuminated with a light flux from a first high-intensity light emitting region of the light source, and a peripheral portion on the illuminated body is illuminated by the light source. The illumination optical system is configured to illuminate with light fluxes from both the first and second high-luminance light emitting regions.

【００１３】[0013]

【実施例】図１は本発明の実施例を表す投写表示装置の
光学系の概略構成図を示したものである。光源１は図１
２に示したメタルハライドランプである。リフレクタ２
は回転放物面形状の反射面を有し、コンデンサ２′は後
述する如き複合形状をなす。３は不要な赤外・紫外光を
除去するカットフィルター、４は照明光束を投影レンズ
８の入射瞳上へ向けるコンデンサ、６はＴＮ液晶及びア
クティブマトリクス等から構成される液晶パネル、５、
７は偏光子及び検光子の機能をなす偏光板である。液晶
パネル６及び偏、検光子５、７は周知のように液晶ライ
トバルブを構成するものである。上記ライトバルブを通
過した光束は投影レンズ８によって不図示のスクリーン
上に拡大投影される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic configuration diagram of an optical system of a projection display apparatus showing an embodiment of the invention. The light source 1 is shown in FIG.
It is the metal halide lamp shown in 2. Reflector 2
Has a reflecting surface in the shape of a paraboloid of revolution, and the capacitor 2'has a complex shape as will be described later. 3 is a cut filter for removing unnecessary infrared / ultraviolet light, 4 is a condenser for directing the illumination light beam onto the entrance pupil of the projection lens 8, 6 is a liquid crystal panel composed of TN liquid crystal, active matrix, etc.
Reference numeral 7 is a polarizing plate that functions as a polarizer and an analyzer. The liquid crystal panel 6 and the polarizing and analyzers 5 and 7 constitute a liquid crystal light valve as is well known. The light flux passing through the light valve is enlarged and projected by a projection lens 8 onto a screen (not shown).

【００１４】光源１は図１３に示した如く両電極１２、
１２′の近傍に非常に輝度の高い領域α、α′を有して
おり、この高輝度領域α、α′が光学系の光軸上にくる
ように光源１は配置される。リフレクタ２は光源１の片
方の高輝度点αに焦点をもつ。一方コンデンサ２′の出
射側は液晶パネル位置に焦点を有する球面或いは非球面
形レンズをなす曲面２′−ａが形成されている。またコ
ンデンサ２′の入射側面は平面をなしており、その中央
には正のパワーをもつ曲面２′−ｂが形成されている。
ライトバルブに近いコンデンサ４はコンデンサ２′から
出射された照明光束を投影レンズ８の入射瞳へ向ける機
能をもち、主としてフィールドレンズの役割を果たす。The light source 1 has both electrodes 12, as shown in FIG.
The light source 1 is arranged so as to have very high brightness regions α and α ′ in the vicinity of 12 ′ and the high brightness regions α and α ′ to be on the optical axis of the optical system. The reflector 2 has a focus on one high-intensity point α of the light source 1. On the output side of the condenser 2 ', on the other hand, a curved surface 2'-a forming a spherical or aspherical lens having a focal point at the position of the liquid crystal panel is formed. The incident side surface of the capacitor 2'is a flat surface, and a curved surface 2'-b having a positive power is formed in the center thereof.
The condenser 4 close to the light valve has a function of directing the illumination light flux emitted from the condenser 2'to the entrance pupil of the projection lens 8, and mainly serves as a field lens.

【００１５】本構成に於て、光源１の高輝度領域α、
α′を有効に利用して高輝度の照明光束を得る機能をリ
フレクタ２、コンデンサ２′、コンデンサ４の組み合わ
せによって得るわけだが、以下にその詳細な説明を行な
う。In this structure, the high brightness area α of the light source 1,
The function of effectively utilizing α ′ to obtain a high-luminance illumination luminous flux is obtained by the combination of the reflector 2, the condenser 2 ′, and the condenser 4, which will be described in detail below.

【００１６】図２は比較のためコンデンサ２′の入射側
の正のパワーをもつ曲面がなく出射側にのみパワーをも
つ場合の光線の集光状況を示したものであり、光学系全
体の概略図を示し、投影スクリーン９上の点から投影レ
ンズ８の瞳を満たす光線を逆方向に追跡した逆トレース
光を示しており、図３はスクリーン上の点Ｐ2 からのメ
リディオナル断面内での逆トレース光について光源１近
傍での収斂状況を示したものである。FIG. 2 shows, for comparison, the state of light collection when there is no curved surface having positive power on the incident side of the condenser 2'and power is present only on the outgoing side. The figure shows an inverse trace light obtained by tracing a ray that fills the pupil of the projection lens 8 from a point on the projection screen 9 in the opposite direction, and FIG. 3 shows an inverse trace in the meridional section from the point P 2 on the screen. It shows the convergence of trace light near the light source 1.

【００１７】スクリーン上の軸上点Ｐ1 からの逆トレー
ス光はリフレクタ２及びコンデンサ２′の出射側の形状
の定義から明らかな様にリフレクタ２の焦点１点にほぼ
収斂する。従って、リフレクタ２の焦点上に光源１の第
１の高輝度領域αを配置するこにより、スクリーン軸上
点Ｐ1 へは最も輝度の高い照明光束が得られる。一方、
軸外点に対しては図３中の部分光束ｌ21、ｌ22で各々収
斂状況が異なる。部分光束ｌ21は高輝度領域αよりもリ
フレクタ２の底部に近い高輝度領域α′の近傍に収斂し
ている。また部分光束ｌ22は高輝度領域αよりもリフレ
クタ２の出射開口側にシフトして集光していることがわ
かる。The reverse trace light from the on-axis point P 1 on the screen is substantially converged on one focal point of the reflector 2 as is clear from the definition of the shapes of the reflector 2 and the condenser 2'on the emitting side. Therefore, by arranging the first high-intensity region α of the light source 1 on the focal point of the reflector 2, the illumination luminous flux with the highest brightness can be obtained at the on-axis point P 1 of the screen. on the other hand,
With respect to the off-axis point, the partial light beams l 21 and l 22 in FIG. 3 have different convergence conditions. The partial luminous flux l 21 is converged in the vicinity of the high-intensity region α ′ closer to the bottom of the reflector 2 than in the high-intensity region α. Further, it can be seen that the partial luminous flux l 22 is condensed and shifted to the exit opening side of the reflector 2 rather than the high brightness area α.

【００１８】本実施例に於けるコンデンサ２′は実際に
は図１で示される様にコンデンサ２′の入射側に正のパ
ワーをもつ曲面２′−ｂが形成されており、図４はその
場合のスクリーン上点Ｐ2 からの逆トレース光について
光源１近傍での収斂状況を示したものである。In the capacitor 2'in this embodiment, a curved surface 2'-b having a positive power is actually formed on the incident side of the capacitor 2'as shown in FIG. 1, and FIG. In the case of the reverse trace light from the point P 2 on the screen in the case, the convergence state in the vicinity of the light source 1 is shown.

【００１９】部分光束ｌ22の更に一部に当たる部分光束
ｌ221 は曲面２′−ｂで屈折され、光源１の高輝度領域
αに収斂しており、部分光束ｌ221 は輝度の高い照明光
束となる。一方、部分光束ｌ21はコンデンサの入射側の
曲面部２′−ｂを通過しないので、図３と同様に光源１
の他方の高輝度領域α′への収斂が維持されている。The partial light fluxes l 221 further hits the part of the partial light beams l 22 is refracted by a curved surface 2'-b, which converge in the high luminance area of the light source 1 alpha, partial light fluxes l 221 is the high illumination light beams having brightness Become. On the other hand, since the partial luminous flux l 21 does not pass through the curved surface portion 2'-b on the incident side of the condenser, the light source 1 is similar to FIG.
Convergence to the other high-intensity region α ′ is maintained.

【００２０】以上示した様に、スクリーン上の軸外点Ｐ
2 からの逆トレース光のうち光源の高輝度点から外れる
光束の一部にのみ作用する屈折部をコンデンサに付加す
ることにより、照明光束の高輝度領域を増加させること
ができ、像面照度を高めることができる。As indicated above, the off-axis point P on the screen
By adding to the condenser a refraction part that acts only on a part of the light flux that deviates from the high-brightness point of the light source in the reverse trace light from 2, it is possible to increase the high-brightness area of the illumination light flux, and to increase the image plane illuminance. Can be increased.

【００２１】本実施例において、軸上点Ｐ1 からの逆ト
レース光のうち、一部はコンデンサ入射側の曲面部２′
−ｂへ入射するため、この一部光束は光源１の高輝度領
域α、α′の中間部分へシフトしてしまい、多少の輝度
の低下を招くはずである。しかしながら、図１２に示す
ように光源１の管球部表面或いはリフレクタ底部のラン
プ保持部等の存在の為、従来においても光軸近傍の光束
はケラレてしまい、照明光として有効に作用していない
ので、曲面部２′−ｂ付加による軸上点Ｐ1 を照明する
光の実質的な輝度低下は殆どない。より好ましくは本実
施例では光源１の管球部サイズ等を考慮して曲面部２′
−ｂのサイズ・形状を決定することが望ましい。In this embodiment, a part of the reverse trace light from the on-axis point P 1 is a curved surface portion 2'on the condenser incident side.
Since it is incident on -b, this partial light flux shifts to the intermediate portion between the high-brightness areas α and α'of the light source 1, which should cause a slight decrease in brightness. However, as shown in FIG. 12, since the surface of the bulb of the light source 1 or the lamp holding portion at the bottom of the reflector exists, the light flux near the optical axis is eclipsed even in the conventional case, and it does not act effectively as illumination light. since, there is little substantial reduction in luminance of light illuminating the on-axis point P 1 by the curved portion 2'-b added. More preferably, in this embodiment, the curved surface portion 2 ′ is considered in consideration of the size of the bulb portion of the light source 1.
It is desirable to determine the size and shape of -b.

【００２２】本実施例に於ては、軸上の点Ｐ1 及び軸外
点Ｐ2（又は光軸周りの輪帯）にのみ着目して説明した
が、それ以外の軸外点或いは輪帯は光源１の高輝度領域
α、α′の中間領域からの光束を中心に照明されること
になる。従って、スクリーン面全体の照度均一化をより
効果的に行なう為には、従来方式に於ては急激に照度低
下を生じる軸外点近傍に上記Ｐ2 に相当する点が存在す
る様に系を構成することが望ましい。In the present embodiment, description has been made focusing only on the on-axis point P 1 and the off-axis point P 2 (or the ring zone around the optical axis), but other off-axis points or ring zones. Will be illuminated around the light flux from the intermediate region between the high brightness regions α and α ′ of the light source 1. Therefore, in order to more effectively make the illuminance uniform on the entire screen surface, in the conventional method, the system is arranged so that the point corresponding to P 2 exists near the off-axis point where the illuminance sharply decreases. It is desirable to configure.

【００２３】図１のコンデンサ４は液晶パネル６上の任
意の点に達する照明光束を投影レンズ８の入射瞳方向へ
有効に向ける機能を有するのもであり、球面形状をなす
単レンズに限らず、非球面形状或いは複数枚のレンズの
組み合わせを含めた１つのレンズ群で構成しても構わな
い。またアクリル等のプラスチックレンズも使用でき
る。またコンデンサ２′についてもレンズ群や非球面形
状等必要に応じて導入して構わない。重要なことは、被
照明体上の中心部を前記光源の第１の高輝度発光領域か
らの光束で照明し、被照明体上の周辺部を前記光源の第
１、第２双方の高輝度発光領域からの光束で照明できる
ように、逆トレース光で説明すると、コンデンサ４で光
束ｌ21とｌ22に分離し、コンデンサ２′で光束ｌ22の中
の光束ｌ221 を高輝度発光領域αに導いてやることであ
る。The condenser 4 of FIG. 1 has a function of effectively directing an illumination light flux reaching an arbitrary point on the liquid crystal panel 6 toward the entrance pupil of the projection lens 8, and is not limited to a single lens having a spherical shape. Alternatively, one lens group including an aspherical shape or a combination of a plurality of lenses may be used. A plastic lens such as acrylic can also be used. Also, the condenser 2'may be introduced as needed, such as a lens group and an aspherical shape. What is important is that the central part on the illuminated object is illuminated with the light flux from the first high-intensity light emitting region of the light source, and the peripheral part on the illuminated object is illuminated by high brightness of both the first and second light sources. as can be illuminated with light beams from the light emitting region, describing a reverse trace light is separated into light fluxes l 21 and l 22 in the capacitor 4, a high-brightness light-emitting region light flux l 221 in the light beam l 22 in the capacitor 2 'alpha It is to lead to.

【００２４】図５は本発明の第２の実施例を表す投写表
示装置の光学系の概略構成図を示したものである。図１
の第１の実施例と同じ部分には同符号を付した。FIG. 5 is a schematic block diagram of an optical system of a projection display apparatus showing a second embodiment of the present invention. Figure 1
The same parts as those in the first embodiment are designated by the same reference numerals.

【００２５】本実施例に於ては、リフレクタ５０２、５
０２′は焦点位置の異なる２つの回転楕円面或いはそれ
に近い形状の反射面から構成されている。リフレクタ５
０２は光源１の片方の高輝度領域αに第１の焦点をも
ち、液晶パネル６の軸上点に第２の焦点をもつ。一方リ
フレクタ５０２′はリフレクタ５０２の第１焦点よりも
リフレクタ５０２の出射開口側にずれた光軸上に片方の
焦点をもつ回転楕円面或いはそれに近い面形状である。
コンデンサ５０４はリフレクタ５０２、５０２′から出
射された照明光束を投影レンズ８の入射瞳へ向ける機能
をもち、主としてフィールドレンズの役割を果たす。In the present embodiment, the reflectors 502, 5
Reference numeral 02 'is composed of two spheroids having different focal positions or a reflecting surface having a shape close to that. Reflector 5
Reference numeral 02 has a first focus on one high-intensity region α of the light source 1, and has a second focus on an axial point of the liquid crystal panel 6. On the other hand, the reflector 502 ′ has a spheroidal surface having one focus on the optical axis, which is displaced from the first focus of the reflector 502 to the exit opening side of the reflector 502, or a surface shape close thereto.
The condenser 504 has a function of directing the illumination light flux emitted from the reflectors 502 and 502 'to the entrance pupil of the projection lens 8, and mainly serves as a field lens.

【００２６】本構成に於て、光源１の高輝度領域α、
α′を有効に利用して高輝度の照明光束を得る機能をリ
フレクタ５０２、５０２′及びコンデンサ５０４の組み
合わせによって得る訳だが以下にその詳細な説明を行な
う。In this structure, the high brightness area α of the light source 1,
A function of effectively utilizing α ′ to obtain a high-luminance illumination luminous flux is obtained by combining the reflectors 502 and 502 ′ and the condenser 504, but a detailed description thereof will be given below.

【００２７】図６は比較のためリフレクタ５０２の回転
楕円面に相当するリフレクタをリフレクタ５０２′の領
域まで延長した場合の光線の集光状況を示したものであ
り、光学系全体の概略構成図を示し、更に投影スクリー
ン９上の点から投影レンズ８の瞳を満たす光線を逆方向
に追跡した逆トレース光を示しており、図７はスクリー
ン上の点Ｐ2 からのメリディオナル断面内での逆トレー
ス光について光源１近傍での収斂状況を示したものであ
る。FIG. 6 shows, for comparison, the state of light collection when a reflector corresponding to the ellipsoid of revolution of the reflector 502 is extended to the area of the reflector 502 ', and a schematic configuration diagram of the entire optical system is shown. In addition, FIG. 7 shows an inverse trace light in which a ray filling the pupil of the projection lens 8 is traced in the opposite direction from a point on the projection screen 9, and FIG. 7 shows an inverse trace in the meridional section from the point P 2 on the screen. It shows the convergence state of light near the light source 1.

【００２８】スクリーン上の軸上点Ｐ1 からの逆トレー
ス光はリフレクタ５０２の形状の定義から明らかな様に
リフレクタ５０２の第１焦点１点に収斂する。従って、
リフレクタ５０２の第１焦点上に光源１の第１の高輝度
領域α′を配置することにより、スクリーンの軸上点Ｐ
1 へは最も輝度の高い照明光束が得られる。一方軸外点
に対しては図７中の部分光束ｌ21、ｌ22で各々収斂状況
が異なる。部分光束ｌ22は高輝度領域α′よりもリフレ
クタ出射開口部に近い高輝度点αの近傍に収斂している
ことがわかる。また、部分光束ｌ21は高輝度領域α′よ
りもリフレクタ５０２の底部側にシフトして集光してい
る事がわかる。The reverse trace light from the on-axis point P 1 on the screen converges on one point of the first focal point of the reflector 502, as is clear from the definition of the shape of the reflector 502. Therefore,
By disposing the first high-intensity region α ′ of the light source 1 on the first focal point of the reflector 502, the on-axis point P of the screen is set.
The illumination light flux with the highest brightness is obtained for 1. On the other hand, with respect to the off-axis point, the partial light beams l 21 and l 22 in FIG. 7 have different convergence states. It can be seen that the partial luminous flux l 22 is converged in the vicinity of the high-intensity point α closer to the reflector exit opening than in the high-intensity region α ′. Further, it can be seen that the partial luminous flux l 21 is condensed and shifted to the bottom side of the reflector 502 rather than the high brightness area α ′.

【００２９】本実施例におけるリフレクタは実際には図
５で示される様にリフレクタ５０２の外側に、焦点位置
がリフレクタ５０２の焦点位置よりもリフレクタ出射開
口側にあるリフレクタ５０２′を有しており、図８はそ
の場合のスクリーン上点Ｐ2からの逆トレース光につい
て光源１近傍での収斂状況を示したものである。As shown in FIG. 5, the reflector in this embodiment actually has a reflector 502 'on the outside of the reflector 502, the focal position of which is on the reflector exit opening side of the focal position of the reflector 502, FIG. 8 shows the convergence state in the vicinity of the light source 1 for the reverse trace light from the point P 2 on the screen in that case.

【００３０】光源１の高輝度領域α′よりもリフレクタ
底部へ向かう逆トレース光束ｌ21の一部の光束ｌ211 は
リフレクタ５０２′により高輝度領域α′へ収斂する。
よって、軸外点Ｐ2 へ到達する照明光束の輝度は向上す
る。また、軸上点Ｐ1 からの逆トレース光はリフレクタ
の周縁部５０２′へは到達しないため、リフレクタ５０
２′による軸上光束への影響はない。The high luminance area of the light source 1 alpha 'part of the light beam l 211 reverse trace beam l 21 towards the reflector bottom portion than the reflector 502' converge to the high luminance region alpha 'by.
Therefore, the brightness of the illumination light flux reaching the off-axis point P 2 is improved. Further, since the reverse trace light from the on-axis point P 1 does not reach the peripheral portion 502 ′ of the reflector, the reflector 50
The 2'has no effect on the axial luminous flux.

【００３１】以上の様に、軸上点Ｐ1 からの逆トレース
光束が及ばない範囲に、リフレクタ５０２よりもリフレ
クタの出射開口側に焦点をもつリフレクタ５０２′を配
置することによって軸外光束の輝度アップを図ることが
できる。As described above, by arranging the reflector 502 'having a focal point closer to the exit opening side of the reflector than the reflector 502, in the range where the reverse traced light flux from the on-axis point P 1 does not reach, the brightness of the off-axis light flux is increased. You can improve.

【００３２】図９及び図１０は本実施例と同等の機能を
もつ光学素子を構成する変形例である、まず、図９に於
ては、図８のリフレクタ５０２′の代わりにリフレクタ
５０２を周縁部までのばし、出射開口側にコンデンサ４
０２を付加したものであり、コンデンサ４０２の周縁部
５０２′に負のパワーをもたせてある。これにより、光
束ｌ21の一部ｌ211 が光源１の高輝度領域α′に収斂
し、軸外光束Ｐ2 の輝度アップが図れる。FIG. 9 and FIG. 10 are modified examples of constructing an optical element having the same function as this embodiment. First, in FIG. 9, the reflector 502 is replaced by a peripheral edge of the reflector 502 'in FIG. Capacitor 4 on the exit side
02 is added, and the peripheral portion 502 'of the capacitor 402 has negative power. As a result, a part l 211 of the light flux l 21 converges on the high-luminance region α ′ of the light source 1, and the brightness of the off-axis light flux P 2 can be increased.

【００３３】一方、図１０の例は、図８のリフレクタ５
０２′の代わりにリフレクタ５０２を周縁部までのば
し、その出射開口側周縁部に、周縁にいくほど厚みのあ
る屈折素子５０２′を付加したものであり、光束ｌ21の
一部ｌ211 が光源１の高輝度領域α′に収斂し、軸外光
束Ｐ2 の輝度アップが図れる。On the other hand, in the example of FIG. 10, the reflector 5 of FIG.
'Extended to the peripheral edge portion of the reflector 502 instead of at its exit opening side peripheral edge, refractive elements 502 a thick toward the periphery' 02 is obtained by adding a part l 211 of the light beam l 21 is the light source 1 Of the off-axis light beam P 2 and the brightness of the off-axis light beam P 2 can be increased.

【００３４】以上、第２の実施例は、回転楕円体をなす
リフレクタをベースにしているが、回転放物または球面
リフレクタとコンデンサレンズの組合せをベースにして
も本実施例と同様の機能をもつ光学素子を付加すること
は可能である。さらには回転放物体、回転楕円体に近い
曲面やその他の非球面による回転面からなるリフレクタ
についても同様である。As described above, the second embodiment is based on the spheroidal reflector, but the combination of a paraboloidal or spherical reflector and a condenser lens has the same function as this embodiment. It is possible to add optical elements. Further, the same applies to a reflector having a paraboloid of revolution, a curved surface close to a spheroid, or any other aspherical surface of revolution.

【００３５】また、第１の実施例で説明した様にコンデ
ンサ５０４は必要に応じて非球面形状を含んだり、レン
ズ群で置き換えることができる。またアクリル等のプラ
スチックレンズも使用できる。Further, as described in the first embodiment, the condenser 504 can include an aspherical shape or can be replaced with a lens group, if necessary. A plastic lens such as acrylic can also be used.

【００３６】第１、第２の実施例共、軸上点に対しては
光源１の片方の高輝度領域αと被照明体上の中心部が互
いに共役となり、軸外点に対しては光源１の高輝度領域
α、α′双方と被照明体上の周辺部が互いに共役、つま
り、クリティカル照明系を構成する。しかし実際には、
軸外点についてはサジタル光線等も考えた場合、残存収
差の為、光源１の高輝度領域α、α′だけでなくその近
傍の発光部からも集光される為、厳密にはクリティカル
照明ではなくなる。In both the first and second embodiments, one high-intensity region α of the light source 1 and the center of the object to be illuminated are conjugate with each other for the on-axis point, and the light source is for the off-axis point. Both the high-intensity areas α and α ′ of No. 1 and the peripheral portion on the illuminated body are conjugated with each other, that is, constitute a critical illumination system. But in reality,
When considering a sagittal ray or the like for the off-axis point, the residual aberration causes the light to be focused not only from the high-brightness areas α and α ′ of the light source 1 but also from the light-emitting portion in the vicinity thereof, so strictly speaking, in critical illumination. Disappear.

【００３７】前述したような共役関係は本発明の必須要
件ではなく、例えば第１の実施例に於いては、コンデン
サ２′の出射側面２′−ａの焦点を液晶パネル６上から
ずらしてもよいし、第２の実施例に於ては、リフレクタ
５０２の第２焦点を液晶パネル６上からずらしてもよ
い。この場合、軸上、軸外共ケーラー照明的になる。The conjugate relationship as described above is not an essential requirement of the present invention. For example, in the first embodiment, even if the focal point of the emission side surface 2'-a of the condenser 2'is shifted from the liquid crystal panel 6. Alternatively, in the second embodiment, the second focus of the reflector 502 may be deviated from the liquid crystal panel 6. In this case, on-axis and off-axis co-Kehler illumination is provided.

【００３８】また、第１の実施例では回転放物面、第２
の実施例では回転楕円面でリフレクタを構成したが、軸
外光束の逆トレース光の光源近傍での収斂域が２分割さ
れる様などんな照明系についても本発明の考え方を適用
することが可能である。その場合、適切なコンデンサ、
或いはコンデンサ群を付加することが必要である。In the first embodiment, the paraboloid of revolution and the second paraboloid are used.
In the embodiment described above, the reflector is constituted by the spheroidal surface, but the idea of the present invention can be applied to any illumination system in which the converging region near the light source of the reverse trace light of the off-axis light flux is divided into two. Is. In that case, a suitable capacitor,
Alternatively, it is necessary to add a capacitor group.

【００３９】また、光源の２つの高輝度部の間隔と軸
上、軸外収斂点の位置関係がマッチングするように、照
明系の構成及びサイズ、光源の電極間距離を選択するこ
とも重要である。It is also important to select the configuration and size of the illumination system and the distance between the electrodes of the light source so that the distance between the two high-intensity portions of the light source matches the positional relationship of the on-axis and off-axis convergence points. is there.

【００４０】第３の実施例を以下に示す。第１の実施例
のリフレクタ２と液晶パネルの間の任意の部分、或いは
第２の実施例のリフレクタ５０２と液晶パネルの間の任
意の部分に図１６に示す如き光学素子を挿入した投写表
示装置である。図１６の１６１は光学多層膜１６１ａを
挟んだプリズムからなる偏光ビームスプリッタである。A third embodiment will be shown below. A projection display device in which an optical element as shown in FIG. 16 is inserted in an arbitrary portion between the reflector 2 and the liquid crystal panel of the first embodiment or an arbitrary portion between the reflector 502 and the liquid crystal panel of the second embodiment. Is. Reference numeral 161 in FIG. 16 denotes a polarization beam splitter composed of prisms sandwiching the optical multilayer film 161a.

【００４１】本実施例の好ましい形態としては、偏光ビ
ームスプリッタで分離された不要光が熱に変換すること
を考慮して、偏光ビームスプリッタをなるべく液晶パネ
ルから離して、例えばリフレクタの出射側近傍に置くの
が望ましい。As a preferred form of this embodiment, considering that the unnecessary light separated by the polarization beam splitter is converted into heat, the polarization beam splitter is separated from the liquid crystal panel as much as possible, for example, near the exit side of the reflector. It is desirable to put it.

【００４２】リフレクタから出射される照明光束は偏光
ビームスプリッタ１６１で互いに直交する偏光成分に分
離され、片方の直線偏光成分はそのまま液晶パネル６へ
向かう。つまり、本素子の作用は偏光板５へ入射する前
に偏光光を生成することにあり、偏光板の発熱を防ぐ。
本実施例では、偏光板５は必ずしも必要ではないが、偏
光板５を置くことによって、偏光光の偏光比を更に上げ
ることができる。The illuminating light beam emitted from the reflector is separated into polarization components orthogonal to each other by the polarization beam splitter 161, and one linear polarization component goes to the liquid crystal panel 6 as it is. That is, the function of this element is to generate polarized light before entering the polarizing plate 5, and prevents the polarizing plate from generating heat.
In this embodiment, the polarizing plate 5 is not always necessary, but by disposing the polarizing plate 5, the polarization ratio of polarized light can be further increased.

【００４３】また、偏光ビームスプリッタから出射する
照明光束の偏光方向と偏光板の透過軸をそろえる必要が
あるので、その場合は必要に応じて波長板等を挿入すれ
ばよい。Further, since it is necessary to align the polarization direction of the illumination light beam emitted from the polarization beam splitter with the transmission axis of the polarizing plate, a wavelength plate or the like may be inserted if necessary.

【００４４】以上透過型液晶ライトバルブを用いた投写
型表示装置の例で実施例を述べてきたが、反射型ライト
バルブを用いた投写型表示装置や、またスライドプロジ
ェクターにも本発明は適用できる。Although the embodiment has been described above by taking the example of the projection type display device using the transmissive liquid crystal light valve, the present invention can be applied to the projection type display device using the reflection type light valve and also the slide projector. ..

【００４５】[0045]

【発明の効果】以上説明したように、本発明は、第１、
第２の高輝度発光領域を有する光源と、該光源からの光
束を被照明体へ向ける照明光学系と、前記被照明体の像
を投影する投影光学系とを有する投写型表示装置におい
て、前記光源の第１、第２の高輝度発光領域を前記照明
光学系の光軸上に配置し、前記被照明体上の中心部を前
記光源の第１の高輝度発光領域からの光束で照明し、前
記被照明体上の周辺部を前記光源の第１、第２双方の高
輝度発光領域からの光束で照明するように前記照明光学
系を構成したので、拡大投影される画面の輝度、特に周
辺部の輝度のアップした照明光学系及びそれを用いた投
写型表示装置が得られ、スクリーン軸上点（中心部）を
照明する光束の輝度を低下させることなく、光源の輝度
分布の特徴を生かして、スクリーン軸外点（周辺部）を
照明する光束の輝度を高めることができる。また、偏光
板の発熱防止ひいては、液晶パネルの熱による特性劣化
が防止できる。As described above, according to the present invention,
A projection type display device comprising: a light source having a second high-intensity light emitting region; an illumination optical system that directs a light flux from the light source toward an illuminated object; and a projection optical system that projects an image of the illuminated object. The first and second high-intensity light emitting regions of the light source are arranged on the optical axis of the illumination optical system, and the central portion of the illuminated object is illuminated with the light flux from the first high-intensity light emitting region of the light source. Since the illumination optical system is configured to illuminate the peripheral portion on the illuminated object with the luminous fluxes from both the first and second high-luminance light emitting regions of the light source, the luminance of the screen to be enlarged and projected, in particular, An illumination optical system with increased brightness in the peripheral portion and a projection display device using the same can be obtained, and the characteristics of the brightness distribution of the light source can be determined without lowering the brightness of the luminous flux illuminating the on-axis point (center part) of the screen. Brightness of the luminous flux that illuminates the off-axis point (peripheral part) of the screen It can be increased. Further, it is possible to prevent the heat generation of the polarizing plate and thus prevent the characteristic deterioration due to the heat of the liquid crystal panel.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の実施例を表す光学系構成図FIG. 1 is a block diagram of an optical system showing an embodiment of the present invention.

【図２】比較例による逆トレース光線図FIG. 2 is an inverse trace ray diagram according to a comparative example.

【図３】比較例による光源近傍の逆トレース光線図FIG. 3 is an inverse trace ray diagram near a light source according to a comparative example.

【図４】本発明の実施例を表す光源近傍の逆トレース光
線図FIG. 4 is an inverse trace ray diagram in the vicinity of a light source showing an embodiment of the present invention.

【図５】本発明の他の実施例を表す光学系構成図FIG. 5 is an optical system configuration diagram showing another embodiment of the present invention.

【図６】本発明の他の実施例による逆トレース光線図FIG. 6 is an inverse trace ray diagram according to another embodiment of the present invention.

【図７】比較例による光源近傍の逆トレース光線図FIG. 7 is an inverse trace ray diagram near a light source according to a comparative example.

【図８】本発明の他の実施例を表す光源近傍の逆トレー
ス光線図FIG. 8 is an inverse trace ray diagram in the vicinity of a light source showing another embodiment of the present invention.

【図９】本発明の他の実施例の変形例を表す光源近傍の
逆トレース光線図FIG. 9 is an inverse trace ray diagram in the vicinity of a light source showing a modified example of another embodiment of the present invention.

【図１０】本発明の他の実施例の変形例を表す光源近傍
の逆トレース光線図FIG. 10 is an inverse trace ray diagram in the vicinity of a light source showing a modified example of another embodiment of the present invention.

【図１１】従来例の光学系構成図FIG. 11 is a block diagram of a conventional optical system.

【図１２】メタルハライドランプの構成図FIG. 12 is a block diagram of a metal halide lamp.

【図１３】メタルハライドランプの輝度分布図FIG. 13 is a luminance distribution diagram of a metal halide lamp.

【図１４】従来例による逆トレース光線図FIG. 14 is a reverse trace ray diagram according to a conventional example.

【図１５】従来例による逆トレース光線図FIG. 15 is an inverse trace ray diagram according to a conventional example.

【図１６】本発明の他の実施例における光学素子図FIG. 16 is an optical element diagram of another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１ 光源 ２ リフレクタ ２′、４ コンデンサ ３ カットフィルター ５ 偏光子 ６ 液晶パネル ７ 検光子 ８ 投影レンズ ９ スクリーン 1 Light Source 2 Reflector 2 ', 4 Condenser 3 Cut Filter 5 Polarizer 6 Liquid Crystal Panel 7 Analyzer 8 Projection Lens 9 Screen

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 第１、第２の高輝度発光領域を有する光
源と、該光源からの光束を被照明体へ向ける照明光学系
と、前記被照明体の像を投影する投影光学系とを有する
投写型表示装置において、前記光源の第１、第２の高輝
度発光領域を前記照明光学系の光軸上に配置し、前記被
照明体上の中心部を前記光源の第１の高輝度発光領域か
らの光束で照明し、前記被照明体上の周辺部を前記光源
の第１、第２双方の高輝度発光領域からの光束で照明す
るように前記照明光学系を構成したことを特徴とする投
写型表示装置。1. A light source having first and second high-luminance light emitting regions, an illumination optical system for directing a light beam from the light source to an illuminated object, and a projection optical system for projecting an image of the illuminated object. In the projection display device having the first and second high-intensity light emitting regions of the light source, the first and second high-intensity light emitting regions of the light source are arranged on the optical axis of the illumination optical system. The illumination optical system is configured to illuminate with a light flux from a light emitting area and illuminate a peripheral portion on the illuminated object with a light flux from both the first and second high brightness light emitting areas of the light source. Projection display device. 【請求項２】 前記照明光学系は、前記被照明体上の前
記中心部と前記光源の第１高輝度発光領域が互いに共役
となり、前記被照明体上の前記周辺部と前記光源の第１
及び第２高輝度発光領域がそれぞれ共役となるように構
成したことを特徴とする請求項１記載の投写型表示装
置。2. In the illumination optical system, the central portion on the illuminated body and the first high-intensity light emitting region of the light source are conjugate with each other, and the peripheral portion on the illuminated body and the first high-luminance area of the light source.
2. The projection display device according to claim 1, wherein the second high-luminance light emitting region is configured to be conjugate with each other. 【請求項３】 前記被照明体が偏光光束を変調すること
により画像を形成するＴＮ液晶、強誘電性液晶、ＰＬＺ
Ｔ等のライトバルブからなり、前記照明光学系は前記ラ
イトバルブに入射する以前の不定偏光光を互いに偏光面
が異なる偏光光に分離して一方の偏光光を前記被照明体
へ向ける偏光ビームスプリッタを備えることを特徴とす
る第１又は２項記載の投写型表示装置。3. A TN liquid crystal, a ferroelectric liquid crystal, and a PLZ which form an image by modulating the polarized light flux by the illuminated body.
The polarization beam splitter is composed of a light valve such as T, and the illumination optical system splits indefinite polarized light before entering the light valve into polarized light having different polarization planes and directs one polarized light toward the illuminated body. The projection display device according to claim 1 or 2, further comprising:
JP3272699A 1991-10-21 1991-10-21 Projection type display device Pending JPH05113605A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP3272699A JPH05113605A (en) 1991-10-21 1991-10-21 Projection type display device
EP92117925A EP0545052B1 (en) 1991-10-21 1992-10-20 Illuminating device and projector utilizing the same
DE69207362T DE69207362T2 (en) 1991-10-21 1992-10-20 Lighting device and projector provided with it
US08/403,549 US5692819A (en) 1991-10-21 1995-03-02 Illuminating device and projector utilizing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3272699A JPH05113605A (en) 1991-10-21 1991-10-21 Projection type display device

Publications (1)

Publication Number Publication Date
JPH05113605A true JPH05113605A (en) 1993-05-07

Family

ID=17517563

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3272699A Pending JPH05113605A (en) 1991-10-21 1991-10-21 Projection type display device

Country Status (1)

Country Link
JP (1) JPH05113605A (en)

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