JPH02304518A - Projection type display device - Google Patents
Projection type display deviceInfo
- Publication number
- JPH02304518A JPH02304518A JP1125848A JP12584889A JPH02304518A JP H02304518 A JPH02304518 A JP H02304518A JP 1125848 A JP1125848 A JP 1125848A JP 12584889 A JP12584889 A JP 12584889A JP H02304518 A JPH02304518 A JP H02304518A
- Authority
- JP
- Japan
- Prior art keywords
- light
- display device
- type display
- projection type
- light source
- 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
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は、ビデオ映像やコンピュータ画像等を表示する
投射型表示装置に関する。なかでも、コントラストに優
れ、コンパクトなサイズを実現できる、透過型ライトバ
ルブを用いた投射型表示装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a projection type display device for displaying video images, computer images, and the like. In particular, the present invention relates to a projection type display device using a transmission type light valve, which has excellent contrast and can realize a compact size.
〔従来の技術］
従来の、透過型ライトバルブを用いた投射型表示装置は
第４図の様な構成をしたものなどが提案されている。（
ＳＩＤ８７ＤＩＧＥＳＴ７５Ｐ）そして、看素数７０，
４００のものは商品化されている。[Prior Art] As a conventional projection type display device using a transmission type light valve, one having a configuration as shown in FIG. 4 has been proposed. (
SID87DIGEST75P) and the prime number 70,
400 of them have been commercialized.
［発明が解決しようとする課題］
しかし、前述の投射型表示装置は、透過型ライトバルブ
を照射する光ビームの太さがまだ太いという欠点を有し
ていた。そのため、投射型表示装置の大きさをさらに小
さくコンパクトにした時。[Problems to be Solved by the Invention] However, the above-described projection type display device has a drawback in that the light beam that irradiates the transmission type light valve is still thick. Therefore, when the size of the projection display device was made smaller and more compact.
光源の発光源をリフレクタの焦点に配置させることが難
しく、光の利用効率が悪くなり１画面が暗くなるという
課題を有していた。（第５図）そこで、本発明の目的は
、上述の課題を解決し、従来よりさらに小さくコンパク
トなサイズでありながら、従来と同等以上の光の利用効
率を有し、同等以上の画面の明るさを有する投射型表示
装置を提供することにある。It is difficult to arrange the light emitting source of the light source at the focal point of the reflector, resulting in a problem that the efficiency of light utilization deteriorates and one screen becomes dark. (Fig. 5) Therefore, the purpose of the present invention is to solve the above-mentioned problems, to have a smaller and more compact size than the conventional one, to have a light utilization efficiency equal to or higher than that of the conventional one, and to have a screen brightness equal to or superior to the conventional one. It is an object of the present invention to provide a projection type display device having the following characteristics.
〔課題を解決するための手段］
本発明の投射型表示装置は、光源からの光を透過型ライ
トバルブで変調し、投射光学手段で投射する投射型表示
装置に於て、前記光源と前記透過型ライトバルブの間に
、光ビームを細（絞る手段が挿入されていることを特徴
とする。[Means for Solving the Problems] A projection type display device of the present invention modulates light from a light source with a transmission type light valve and projects the light with a projection optical means. It is characterized by a means for narrowing the light beam inserted between the molded light valves.
〔作 用１
上記の様に構成された投射型表示装置は、第１図に示し
たごと（、光の利用効率をなんらそこなうことなく、光
ビームを細く絞ることができる。[Function 1] The projection display device configured as described above, as shown in FIG. 1, can narrow the light beam without any loss in light utilization efficiency.
そのため、第２図に示したように、従来と同等以上の光
の利用効率を有し、同等以上の画面の明るさを有する投
射型表示装置を、従来よりさらに小さくコンパクトなサ
イズで実現できる。Therefore, as shown in FIG. 2, it is possible to realize a projection type display device having a light utilization efficiency equal to or higher than that of the conventional device and a screen brightness equal to or superior to that of the conventional device, but in a smaller and more compact size than the conventional device.
以下、実施例にもとすき本発明の詳細な説明する。ただ
し、本発明は以下の実施例に限定される乙のではない。Hereinafter, the present invention will be explained in detail using examples. However, the present invention is not limited to the following examples.
［実施例１］
第１図は本発明の投射型表示装置の原理を示す構成図で
ある。ここで、ｌは光源、２はリフレクタ、３は凸レン
ズ、４は凹レンズ、５は透過型液晶ライトバルブ、６は
投射レンズ、７はスクリーンである。３．４の２種類の
レンズ群で光ビームを細く絞る手段を形成した。[Embodiment 1] FIG. 1 is a block diagram showing the principle of a projection type display device of the present invention. Here, l is a light source, 2 is a reflector, 3 is a convex lens, 4 is a concave lens, 5 is a transmission type liquid crystal light valve, 6 is a projection lens, and 7 is a screen. The two types of lens groups in 3.4 form a means to narrow the light beam.
図を見てあきらかなように、この光ビームを細く絞る手
段は、光の利用効率をなんらそこなうことな（光ビーム
を細（絞ることができた。そのため、従来と同様以上の
画面の明るさを有する投射型表示装置を従来のものより
さらに小さくコンパクトに安価に実現できた。As is clear from the figure, this method of narrowing the light beam does not impair the light utilization efficiency (the light beam can be narrowed down). It was possible to realize a projection type display device having a smaller size, more compactness, and at a lower cost than the conventional one.
その様子を第２図及び第４図に示す。第２図は本発明の
投射型表示装置の構成図であり、第４図は従来の投射型
表示装置の構成図である。ここで８は白色光を３原色に
分けるダイクロイックミラー、９は光ビームの光路な折
り曲げるミラー、ＩＯは変調された３つの色光な合成す
るグイクロイックプリズムである。この２つの図から、
本発明の投射型表示装置は従来の投射型表示装置に比べ
てり゛イズを大幅に減することができた６なお、本実施
例では光ビームを細く絞るための凸レンズと、絞られた
光ビームを略平行に直すための凹レンズを、第一のダイ
クロイックミラーをはさんで前後に配置したために、凸
レンズと凹レンズを共に第一のダイクロイックミラーの
前に配置した場合に比べて光路長を短くすることができ
、更に小さくコンパクトな投射型表示装置と実現できた
６
なお、本発明はフロント型、リア型をとわず有効であっ
た。The situation is shown in FIGS. 2 and 4. FIG. 2 is a block diagram of a projection type display device of the present invention, and FIG. 4 is a block diagram of a conventional projection type display device. Here, 8 is a dichroic mirror that divides white light into three primary colors, 9 is a mirror that bends the optical path of the light beam, and IO is a gicchroic prism that combines the modulated three color lights. From these two figures,
The projection type display device of the present invention was able to significantly reduce noise compared to the conventional projection type display device. Since the concave lenses to make the beam almost parallel are placed in front and behind the first dichroic mirror, the optical path length is shorter than when both the convex lens and the concave lens are placed in front of the first dichroic mirror. The present invention was effective for both front and rear types.
［比較例１１
従来の投射型表示装置でも全体的にサイズを小型化する
ことによって目的が達せられるように想われるかも知れ
ないが実はそうではない。第５図を用いて説明する。す
なわち、光量を落とさずに光源（ランプ）を小さくする
ことは極めて難しいため、光学ユニット全体を小さくし
ても、光源だけは従来のままの大きさが必要である。従
って物理的制約からりフレフタをある程度以上小さくす
ることはできないし、もし無理矢理小さくしたとしても
、光源自身の影の部分の影響が無視できな（なって画面
にムラができてしまったり、光源の発光源をリフレクタ
の焦点に配置することができなくなってしまった。特に
メタルハライドランプのときに顕著であった。[Comparative Example 11 It may seem that the purpose of the conventional projection display device can be achieved by reducing the overall size, but this is not actually the case. This will be explained using FIG. That is, it is extremely difficult to make the light source (lamp) smaller without reducing the amount of light, so even if the entire optical unit is made smaller, only the light source needs to remain the same size as before. Therefore, due to physical constraints, it is not possible to make the frame smaller beyond a certain level, and even if it were to be made smaller, the influence of the shadow part of the light source itself cannot be ignored (this may cause unevenness on the screen, or It has become impossible to place the light source at the focal point of the reflector, especially with metal halide lamps.
［比較例２１
従来の投射型表示装置の光源ユニット（即ち、光源＋リ
フレクタ）はそのまま用い、それ以外の光学ユニットの
み小型化した例を第６図に示す。Comparative Example 21 FIG. 6 shows an example in which the light source unit (ie, light source + reflector) of a conventional projection display device is used as is, and only the other optical units are downsized.
図からあきらかなように、投射型表示装置とししてのサ
イズはコンパクトになったが、光の利用効率は低くなり
、画面が暗くなってしまった６〔実施例２ｊ
第７図は本発明の実施例１とは異なる構成図である。１
４の凸レンズと１５の凹レンズが挿入されている。この
ため、従来より小さくコンパクトなサイズをもち、さら
に色ムラの少ない優れた投射型表示装置を実現できた。As is clear from the figure, although the size of the projection display device has become more compact, the light utilization efficiency has decreased and the screen has become dark6. FIG. 2 is a configuration diagram different from the first embodiment. 1
4 convex lenses and 15 concave lenses are inserted. As a result, it has been possible to realize an excellent projection type display device that is smaller and more compact than conventional devices and has less color unevenness.
［発明の効果］
本発明の投射型表示装置は、光源からの光を透過型ライ
トバルブで変調し、投射光学手段で投ｑ１する投射型表
示装置に於て、前記光源と前記透過型ライトバルブの間
に、光ビームを細く絞る手段が挿入されているために、
従来と同等以上の光の利用効率を有し、同等以上の画面
の明るさを有する投射型表示装置を、従来よりさらに小
さくコンパクトなサイズでしかも安価に実現できるとい
う効果がある。[Effects of the Invention] A projection type display device of the present invention modulates light from a light source with a transmission type light valve and projects the light q1 with a projection optical means, in which the light source and the transmission type light valve are combined. Because a means to narrow the light beam is inserted between the two,
The present invention has the effect that a projection type display device having a light utilization efficiency equal to or higher than that of the conventional art and having a screen brightness equal to or superior to the conventional one can be realized in a smaller and more compact size than the conventional one, and at a lower cost.
第１図は本発明の投射型表示装置の照明系の構成図。
第２図は本発明の投射型表示装置の構成図。
第３図は従来の投射型表示装置の照明系の構成図。
第４図は従来の投射型表示装置の構成図。
第５図はりフレフタを小さくした場合の光源ユニットを
示す図。
第６図は従来と同じ大きさの光源ユニットを用い、それ
以外の光学ユニットだけ小さくした場合の構成図。
第７図は本発明の実施例１とは異なる構成を持った投射
型表示装置の構成図。
■・・・光源
２・・・リフレクタ
３・・・凸レンズ
４・・・凹レンズ
５・・・透過型液晶ライトバルブ
６・・・投射レンズ
７・・・スクリーン
８・・・グイクロイックミラー
９・・・くツー
ｌＯ・・・グイクロイックプリズム
１１・・・従来より小さくしたりフレフタ１２・・・有
効に利用される光
１３・・・利用されない光（ロス分）
１４・・・色ムラ解消用凸レンズ
１５・・・色ムラ解消用凹レンズ
以上
出願人 セイコーエプソン株式会社
代理人 弁理士 鈴 木 喜三部（他１名）不７１図FIG. 1 is a configuration diagram of an illumination system of a projection display device of the present invention. FIG. 2 is a configuration diagram of a projection type display device of the present invention. FIG. 3 is a configuration diagram of an illumination system of a conventional projection display device. FIG. 4 is a configuration diagram of a conventional projection display device. FIG. 5 is a diagram showing a light source unit when the beam flap is made smaller. FIG. 6 is a configuration diagram in which a light source unit of the same size as the conventional one is used, but only the other optical units are made smaller. FIG. 7 is a configuration diagram of a projection type display device having a configuration different from that of Embodiment 1 of the present invention. ■... Light source 2... Reflector 3... Convex lens 4... Concave lens 5... Transmissive liquid crystal light valve 6... Projection lens 7... Screen 8... Guicroic mirror 9. ... Kutsu lO... Guicroic prism 11... Make it smaller than before, or flafter 12... Light that is effectively used 13... Light that is not used (loss) 14... Eliminate color unevenness Convex lens for use 15... Concave lens for eliminating color unevenness and above Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki (1 other person) Figure No. 71
Claims (1)
手段で投射する投射型表示装置に於て、該光源と該透過
型ライトバルブの間に、光ビームを細く絞る手段が挿入
されていることを特徴とする投射型表示装置。In a projection display device in which light from a light source is modulated by a transmission type light valve and projected by a projection optical means, a means for narrowing the light beam is inserted between the light source and the transmission type light valve. A projection display device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1125848A JPH02304518A (en) | 1989-05-19 | 1989-05-19 | Projection type display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1125848A JPH02304518A (en) | 1989-05-19 | 1989-05-19 | Projection type display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02304518A true JPH02304518A (en) | 1990-12-18 |
Family
ID=14920441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1125848A Pending JPH02304518A (en) | 1989-05-19 | 1989-05-19 | Projection type display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02304518A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6149276A (en) * | 1998-01-28 | 2000-11-21 | Nec Corporation | Image projector |
-
1989
- 1989-05-19 JP JP1125848A patent/JPH02304518A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6149276A (en) * | 1998-01-28 | 2000-11-21 | Nec Corporation | Image projector |
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