JPS61177079A - Projection type television receiver - Google Patents

Projection type television receiver

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Publication number
JPS61177079A
JPS61177079A JP60017125A JP1712585A JPS61177079A JP S61177079 A JPS61177079 A JP S61177079A JP 60017125 A JP60017125 A JP 60017125A JP 1712585 A JP1712585 A JP 1712585A JP S61177079 A JPS61177079 A JP S61177079A
Authority
JP
Japan
Prior art keywords
liquid crystal
crystal device
polarized light
light
polarization
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
JP60017125A
Other languages
Japanese (ja)
Inventor
Masami Himuro
氷室 昌美
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP60017125A priority Critical patent/JPS61177079A/en
Publication of JPS61177079A publication Critical patent/JPS61177079A/en
Pending legal-status Critical Current

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

PURPOSE:To suppress the drop of the quantity of light at a low level and to obtain a picture of high luminance by using 90 deg. twist nematic liquid crystal having 0.2 or more double refraction for a reflection type liquid crystal device and utilizing the rotation of a polarizing surface due to the double refraction effect. CONSTITUTION:The reflection type liquid crystal device 4R for a red picture is constituted of a liquid crystal element 5R' and a reflection mirror 7R and the element 5R' is constituted of the 90 deg. twist nematic liquid crystal having 0.2 or more double refraction DELTAn. When polarized light is made incident upon the liquid crystal device 4R, the polarized light is obtained through the liquid crystal element 5R', the reflection mirror 7R and the liquid crystal element 5R' and the reflected polarized light is rotated at its polarizing surface on the basis of a red original signal in each picture element part positioned like a matrix because of the double refraction effect of the liquid crystal element 5R'.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、反射型液晶装置を使用した投射形テレビジョ
ン受像機(以下「投射形TVJという)に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a projection television receiver (hereinafter referred to as "projection TVJ") using a reflective liquid crystal device.

〔発明の概要〕[Summary of the invention]

本発明は、往復過程で、映像信号に基づき各画素部分毎
に偏光面の回転を行なう反射型液晶装置を使用した投射
形TVにおいて、この液晶装置を複屈折が0.2以上の
90’ツイストネマテイツク液晶を用いて構成し、その
複屈折効果による偏光面の回転を利用することにより、
高輝度の画像を得ることができるようにしたものである
The present invention provides a projection TV that uses a reflective liquid crystal device that rotates the plane of polarization for each pixel based on the video signal during the round trip process. By using nematic liquid crystal and utilizing the rotation of the plane of polarization due to its birefringence effect,
This makes it possible to obtain high-brightness images.

〔従来の技術〕[Conventional technology]

投射形TVとして、第3図に示すように、反射型液晶装
置を使用したものが提案されている。
As a projection type TV, one using a reflective liquid crystal device as shown in FIG. 3 has been proposed.

同図において、(1)は偏光子及び検光子を兼用する偏
光ビームスプリッタ、(2)は青反射グイクロイックミ
ラー、(3)は赤反射ダイクロイックミラーで、これら
は順次差べられ、ミラー(3)の直進側に緑色画像用の
反射型液晶装置(4G)が配されると共に、その反射側
に赤色画像用の反射型液晶装置(4R)が配される。ま
た、ミラー(2)の反射側に青色画像用の反射型液晶装
置(4B)が配される。
In the figure, (1) is a polarizing beam splitter that serves as both a polarizer and an analyzer, (2) is a blue-reflecting dichroic mirror, and (3) is a red-reflecting dichroic mirror. A reflective liquid crystal device (4G) for green images is placed on the straight-ahead side of 3), and a reflective liquid crystal device (4R) for red images is placed on the reflective side. Further, a reflective liquid crystal device (4B) for blue images is arranged on the reflective side of the mirror (2).

液晶装置(4R)は、液晶素子(5R)、偏光板(6R
)及び反射ミラー(7R)で構成されている。液晶素子
(5R)は、複屈折Δnの小さな1例えば0.1以下の
90°ツイストネマテイツク液晶を用いて構成される。
The liquid crystal device (4R) includes a liquid crystal element (5R), a polarizing plate (6R)
) and a reflecting mirror (7R). The liquid crystal element (5R) is constructed using a 90° twisted nematic liquid crystal having a small birefringence Δn of 1, for example, 0.1 or less.

即ち、液晶を挾んで−の面金面に透明電極が配されると
共に、他の面には各画素に対応して透明な画素電極がマ
トリクス状(例えば512X512)に形成され、この
各画素電極に、赤原色信号エリサンプリングされて形成
された画素信号が夫々供給されるようになされている。
That is, transparent electrodes are disposed on the negative metal surface sandwiching the liquid crystal, and transparent pixel electrodes are formed in a matrix (for example, 512 x 512) corresponding to each pixel on the other surface, and each pixel electrode A pixel signal formed by elisampling the red primary color signal is supplied to each of the pixels.

したがって、液晶装置(4R)に偏光が入射されると、
この偏光は、液晶素子(5R)→偏光板(6R)→反射
ミラー(7R)→偏光板(6R)→液晶素子(5R)を
通過して得られるが、この反射して得られる偏光は液晶
素子(5R)におけるツイスト効果のため、マトリクス
状に位置する各画素部分毎に、赤原色信号に基づいた偏
光面の回転がなされたものとなる。
Therefore, when polarized light is incident on the liquid crystal device (4R),
This polarized light is obtained by passing through the liquid crystal element (5R) → polarizing plate (6R) → reflective mirror (7R) → polarizing plate (6R) → liquid crystal element (5R). Due to the twist effect in the element (5R), the plane of polarization is rotated based on the red primary color signal for each pixel portion located in a matrix.

尚、偏光板(6R)がないときには、液晶素子(5R)
のツイスト効果は往復で相殺され、同等偏光面の回転は
生じない。
In addition, when there is no polarizing plate (6R), the liquid crystal element (5R)
The twisting effect of is canceled out during the round trip, and no rotation of the equivalent plane of polarization occurs.

また、液晶装置(4G)及び(4B)も上述した液晶装
置(4R)と同様に構成され、対応する部分には、符号
中の′″R#の代9に″G”及び1B”を付して示して
いる。即ち、液晶素子(5G)は緑原色信号で駆動され
、液晶装置(4G)に偏光が入射されると、反射して得
られる偏光は、液晶素子(5G)のツイスト効果のため
、マトリクス状に位置する各画素部分毎に、緑原色信号
に基づいた偏光面の回転がなされたものとなる。また、
液晶素子(5B)は青原色信号で駆動され、液晶装置(
4B)に偏光が入射されると、反射して得られる偏光は
、液晶素子(5B)のツイスト効果のため、マ) IJ
クス状に位置する各画素部分毎に、青原色信号に基づい
た偏光面の回転がなされたものとなる。
Furthermore, the liquid crystal devices (4G) and (4B) are constructed in the same manner as the liquid crystal device (4R) described above, and "G" and "1B" are added to the corresponding parts in place of "R#" in the code. It is shown as follows. That is, the liquid crystal element (5G) is driven by a green primary color signal, and when polarized light is incident on the liquid crystal device (4G), the polarized light obtained by reflection is arranged in a matrix due to the twist effect of the liquid crystal element (5G). The plane of polarization is rotated based on the green primary color signal for each located pixel portion. Also,
The liquid crystal element (5B) is driven by the blue primary color signal, and the liquid crystal device (
When polarized light is incident on 4B), the polarized light obtained by reflection is due to the twist effect of the liquid crystal element (5B).
The plane of polarization is rotated based on the blue primary color signal for each pixel portion located in a box shape.

また、第3図において、(8)は光源を構成するキセノ
ンランプであシ、(9)はだ円面鏡である。キセノンラ
ンプ(8)からの光は平行化凹レンズαQで平行光とさ
れた後ビームスプリッタ(1)に供給され、直進するP
成分偏光1.と反射するS成分偏光t8とに分けられる
。このS成分偏光tllはミラー(2)、(3)により
、赤、緑及び青の色光Lax + LB。及びtsl 
に分解され、夫々液晶装置(4R)、(4G)及び(4
B)に入射するようにされる。
Further, in FIG. 3, (8) is a xenon lamp constituting the light source, and (9) is an ellipsoidal mirror. The light from the xenon lamp (8) is made into parallel light by the collimating concave lens αQ, and then supplied to the beam splitter (1), where it travels straight to P.
Component polarization 1. and the reflected S component polarized light t8. This S component polarized light tll is converted into red, green, and blue colored light Lax + LB by mirrors (2) and (3). and tsl
are decomposed into liquid crystal devices (4R), (4G) and (4G), respectively.
B).

また、第3図において、α〃はフィールドレンズ、α2
は縮小レンズ、(至)はズーム投射レンズ、伽→はスク
リーンである。
In addition, in Fig. 3, α〃 is a field lens, α2
is a reduction lens, (to) is a zoom projection lens, and 佽→ is a screen.

この第3図例において、液晶装置(4R)に色光4、が
入射すると、赤原色信号に応じて各画素部分毎に偏光面
の回転した偏光が反射光として得られ、これが再度ビー
ムスプリッタ(1)に供給される。この場合、偏光面の
回転によシ生じるP成分偏光のみが直進し、フィールド
レンズ(ロ)及び縮小レンズ住zを介してズーム投射レ
ンズ(2)に供給され、スクリーンαゆ上に投射される
。残シのS成分偏光は反射してキセノンランプ(8)の
方に戻っていく。尚、詳細は省略するが、液晶装置(4
G)及び(4B)に入射する色光t8゜及びL8BVC
関しても同様である。
In the example shown in FIG. 3, when colored light 4 is incident on the liquid crystal device (4R), polarized light whose plane of polarization is rotated for each pixel portion according to the red primary color signal is obtained as reflected light, and this is reflected again at the beam splitter (1). ). In this case, only the P component polarized light generated by the rotation of the polarization plane travels straight, is supplied to the zoom projection lens (2) via the field lens (b) and the reduction lens, and is projected onto the screen α. . The remaining S component polarized light is reflected and returns to the xenon lamp (8). Although the details are omitted, the liquid crystal device (4
Colored light t8° and L8BVC incident on G) and (4B)
The same applies to

結局、スクリーン(L4上には、各画素部分毎に明暗変
調がなされた、赤色画像を形成すべき像光、同じく緑色
画像及び青色画像を形成すべ負像光が投射され、拡大カ
ラー画像(ロ)が表示される。
As a result, on the screen (L4), image light for forming a red image and negative image light for forming a green image and a blue image are projected onto the screen (L4), and the brightness and darkness are modulated for each pixel portion. ) is displayed.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかしながら、このような投射形TVによれば、液晶装
置(4R)〜(4B)は、液晶素子(5R)〜(5B)
のツイスト効果が往復で相殺しないように偏光板(6R
)〜(6B)が配されてなるもので69、この偏光板(
6R)〜(6B)のために光量が大幅に低下し、高輝度
の画像を得ることができないという問題があった。
However, according to such a projection TV, the liquid crystal devices (4R) to (4B) are the liquid crystal elements (5R) to (5B).
A polarizing plate (6R
) to (6B) are arranged.69, this polarizing plate (
6R) to (6B), there was a problem in that the amount of light was significantly reduced, making it impossible to obtain a high-luminance image.

本発明は斯る点に鑑み、光量の低下を少なく抑え、高輝
度の画像を得ることができるようにするものである。
In view of this point, the present invention is intended to suppress the decrease in light amount to a small extent and make it possible to obtain a high-luminance image.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は上述問題点を解決する九め、反射型液晶装置に
偏光板を用いないようにするものである。
The present invention solves the above-mentioned problems by eliminating the use of polarizing plates in reflective liquid crystal devices.

即ち、反射型液晶装置(4R)〜(4B)には、複屈折
が0.2以上の90°ツイストネマテイツク液晶を使用
し、複屈折効果による偏光面の回転を利用するものであ
る。
That is, the reflective liquid crystal devices (4R) to (4B) use a 90° twisted nematic liquid crystal having a birefringence of 0.2 or more, and utilize the rotation of the plane of polarization due to the birefringence effect.

〔作用〕[Effect]

偏光板を使用しないので、ツイスト効果による偏光面の
回転は、往復で相殺されることになるが、複屈折効果に
より偏光面の回転を生じる。即ち、液晶装#t(4R)
〜(4B)に偏光が入射されると、この液晶装置(4R
)〜(4B)からは、映像信号に基づき各画素部分毎に
偏光面の回転がなされた偏光が反射して得られる。従っ
て、スクリーン上には従来同様に拡大画像が表示される
Since no polarizing plate is used, the rotation of the plane of polarization due to the twist effect is canceled out by the round trip, but the rotation of the plane of polarization occurs due to the birefringence effect. That is, liquid crystal #t (4R)
When polarized light is incident on ~(4B), this liquid crystal device (4R
) to (4B), polarized light whose plane of polarization has been rotated for each pixel portion based on the video signal is reflected and obtained. Therefore, an enlarged image is displayed on the screen as in the conventional case.

〔実施例〕〔Example〕

以下、第1図を参照しながら本発明の一実施例について
説明しよう。この8g1図において、第3図と対応する
部分には同一符号を付し、その詳細説明は省略する。
Hereinafter, one embodiment of the present invention will be described with reference to FIG. In FIG. 8g1, parts corresponding to those in FIG. 3 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

本例において、赤色画像用の反射型液晶装置(4R)は
、液晶素子(5R’)及び反射ミラー(7R)で構成さ
れる。液晶素子(5R’)は、複屈折Δnが0.2以上
の90’ツイストネマテイツク液晶を用いて構成され、
その他は第3図例における液晶素子(5R)と同様に構
成される。この液晶素子(5Rりに偏光を供給するとき
の往復反射特性は、第2図破線11.1雪で示すように
、スレッショルド電圧vthと飽和電圧vI、ATの中
間電圧で最大出力(最小出力)となシ、電圧vth、■
、□アでは最小出力(最大出力)となる特性となる。&
l、a!は入力偏光面が90’異なるときのものである
。ここで、実線b1 * b雪は透過特性を示しておシ
、同様に、bl 、 b、は入力偏光面が90’異なる
ときのものである。この場合、ツイスト効果による偏光
面の回転は相殺され、複屈折効果による偏光面の回転の
みが往復2倍となって現われる。即ち、本例の液晶装置
(5Rつにおいては、この複屈折効果による偏光面の回
転が利用される。
In this example, a reflective liquid crystal device (4R) for a red image is composed of a liquid crystal element (5R') and a reflective mirror (7R). The liquid crystal element (5R') is constructed using a 90' twisted nematic liquid crystal with a birefringence Δn of 0.2 or more,
The rest of the structure is the same as the liquid crystal element (5R) in the example shown in FIG. The round-trip reflection characteristics when polarized light is supplied to this liquid crystal element (5R) are as shown by the broken line 11.1 in Figure 2. Tonashi, voltage vth, ■
, □A has the characteristic of minimum output (maximum output). &
l,a! are when the input polarization planes differ by 90'. Here, the solid line b1*b indicates the transmission characteristic, and similarly, b1 and b are when the input polarization planes differ by 90'. In this case, the rotation of the plane of polarization due to the twist effect is canceled out, and only the rotation of the plane of polarization due to the birefringence effect appears as double the round trip. That is, in the liquid crystal device (5R) of this example, rotation of the plane of polarization due to this birefringence effect is utilized.

したがって、液晶装置(4R)に偏光が入射されると、
この偏光は、液晶素子(5Rつ→反射ミラー(7R)→
液晶素子(5R’)を通過して得られるが、この反射し
て得られる偏光は、液晶素子(5R’)にかける複屈折
効果のため、マトリクス状に位置する各画素部分毎に、
赤原色信号に基づいた偏光面の回転がなされたものとな
る。
Therefore, when polarized light is incident on the liquid crystal device (4R),
This polarized light is transmitted through the liquid crystal element (5R → reflecting mirror (7R) →
This polarized light is obtained by passing through the liquid crystal element (5R'), but due to the birefringence effect applied to the liquid crystal element (5R'), the polarized light is polarized for each pixel located in a matrix.
The plane of polarization is rotated based on the red primary color signal.

また、本例において、緑色画像用の液晶装置(4G)及
び青色画像用の液晶装置(4B)も、上述した液晶装置
(4R)と同様に構成され、対応する部分には符号中の
“R″の代りに“G”及び“B#を付している。即ち、
液晶素子(5Gつは緑原色信号で駆動され、液晶装置(
4G)に偏光が入射されると、′反射して得られる偏光
は、液晶素子(5G’)における複屈折効果のため、マ
) IJクス状に位置する各画素部分毎に、緑原色信号
に基づいた偏光面の回転がなされたものとなる。ま次、
液晶素子(5Bりは青原色信号で駆動され、液晶装置(
4B)に偏光が入射されると、反射して得られる偏光は
、液晶素子(5Bつにおける複屈折効果のため、マトリ
クス状に位置する各画素部分毎に、青原色信号に基づい
た偏光面の回転がなされたものとなる。
In addition, in this example, the liquid crystal device for green images (4G) and the liquid crystal device for blue images (4B) are configured similarly to the above-mentioned liquid crystal device (4R), and the corresponding parts are marked with "R" in the code. "G" and "B#" are added instead of "."
Liquid crystal element (5G is driven by green primary color signal, liquid crystal device (
When polarized light is incident on 4G), due to the birefringence effect in the liquid crystal element (5G'), the polarized light obtained by reflection is converted into a green primary color signal for each pixel portion located in the shape of an IJ square. The plane of polarization has been rotated based on the Matsugi,
The liquid crystal element (5B is driven by the blue primary color signal, and the liquid crystal device (
When polarized light is incident on the liquid crystal element (4B), the resulting polarized light is reflected by the polarization plane based on the blue primary color signal for each pixel located in a matrix due to the birefringence effect in the liquid crystal element (5B). The rotation has been made.

本例は以上の工うに構成され、その他は第3図例と同様
に構成される。
This example is constructed as described above, and the rest is the same as the example shown in FIG.

本例においても、液晶装置(4R)、(4G)及び(4
B)に色光’am ”8G及びtoが入射すると、夫々
赤・緑及び青原色信号に応じて各画素部分毎に偏光面の
回転した偏光が反射光として得られる。したがって、ス
クリーン上φ上には、各画素部分毎に明暗変調がなされ
次、赤、緑及び青色画像を形成すべき像光が投射され、
拡大カラー画像(至)が表示される。
Also in this example, the liquid crystal devices (4R), (4G) and (4
When the colored lights 'am' 8G and to are incident on B), polarized light whose plane of polarization is rotated for each pixel part according to the red, green and blue primary color signals is obtained as reflected light. Therefore, on the screen φ The brightness and darkness are modulated for each pixel portion, and then image light to form red, green, and blue images is projected.
An enlarged color image (to) is displayed.

本例の投射形TVによれば、液晶装置(4R)(4B)
に偏光板を使用していないので、この液晶装置(4R)
〜(4B)の反射過程における光量の大幅な低下がなく
、従って、カラー画像(ト)として高輝度のものを得る
ことができる。
According to the projection TV of this example, the liquid crystal device (4R) (4B)
This liquid crystal device (4R) does not use a polarizing plate.
There is no significant decrease in the amount of light during the reflection process of (4B), and therefore a high-luminance color image (g) can be obtained.

尚、上述実施例は、カラーの場合につき述べたものであ
るが、勿論白黒のものも同様に構成することができる。
Although the above-mentioned embodiment has been described in terms of a color case, it goes without saying that a black and white case can also be constructed in the same manner.

〔発明の効果〕〔Effect of the invention〕

以上述べ定本発明によれば、反射型液晶装置に偏光板を
使用していないので、これによる光量の大幅な低下がな
く、従って、従来よシ高輝度の画像を得ることができる
According to the present invention as described above, since a polarizing plate is not used in the reflective liquid crystal device, there is no significant decrease in the amount of light due to this, and therefore, it is possible to obtain an image with higher brightness than before.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例を示す構成図、第2図はその
説明のための光出力特性図、第3図は従来例の構成図で
ある。 (1)は偏光ビームスプリッタ、(4R)〜(4B)は
夫々反射型液晶装置、(8)はキセノンランプ、(至)
はズーム投射レンズ、α→はスクリーンである。
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a light output characteristic diagram for explaining the same, and FIG. 3 is a block diagram of a conventional example. (1) is a polarizing beam splitter, (4R) to (4B) are reflective liquid crystal devices, (8) is a xenon lamp, (to)
is a zoom projection lens, and α→ is a screen.

Claims (1)

【特許請求の範囲】 光源と、偏光ビームスプリッタと、映像信号に基づき各
画素部分毎に偏光面の回転を行なう反射型液晶装置と、
投射レンズとを備え、光源からの光が上記偏光ビームス
プリッタを介して上記液晶装置に入射され、この液晶装
置からの反射光が上記偏光ビームスプリッタ、投射レン
ズを介してスクリーン上に投射され、このスクリーン上
に拡大画像が表示されるものにおいて、 上記液晶装置は、複屈折が0.2以上の90°ツイスト
ストネマティック液晶が使用されて構成されることを特
徴とする投射形テレビジョン受像機。
[Claims] A light source, a polarizing beam splitter, a reflective liquid crystal device that rotates the plane of polarization for each pixel based on a video signal,
The light from the light source is incident on the liquid crystal device via the polarizing beam splitter, and the reflected light from the liquid crystal device is projected onto the screen via the polarizing beam splitter and the projection lens. A projection type television receiver in which an enlarged image is displayed on a screen, wherein the liquid crystal device is constructed using a 90° twisted nematic liquid crystal having a birefringence of 0.2 or more.
JP60017125A 1985-01-31 1985-01-31 Projection type television receiver Pending JPS61177079A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60017125A JPS61177079A (en) 1985-01-31 1985-01-31 Projection type television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60017125A JPS61177079A (en) 1985-01-31 1985-01-31 Projection type television receiver

Publications (1)

Publication Number Publication Date
JPS61177079A true JPS61177079A (en) 1986-08-08

Family

ID=11935311

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60017125A Pending JPS61177079A (en) 1985-01-31 1985-01-31 Projection type television receiver

Country Status (1)

Country Link
JP (1) JPS61177079A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63182987A (en) * 1987-01-24 1988-07-28 Canon Inc Light polarizing element for liquid crystal display projector
JPS63228887A (en) * 1987-03-18 1988-09-22 Matsushita Electric Ind Co Ltd Video projector
JPS63292892A (en) * 1987-05-26 1988-11-30 Kawasaki Heavy Ind Ltd Color image projecting device
JPS6468090A (en) * 1987-09-09 1989-03-14 Hitachi Ltd Multicolor projection type liquid crystal display
JPH01191219A (en) * 1988-01-26 1989-08-01 Mutoh Ind Ltd Drawing coordinate input device for cad
JPH03179336A (en) * 1990-11-29 1991-08-05 Casio Comput Co Ltd Projection type display device
US5638142A (en) * 1992-04-03 1997-06-10 Rank Brimar Limited Spatial light modulator system including a plurality of tiltable mirror devices and reflective means for equalizing the number of reflections from the tiltable mirror devices
US5658060A (en) * 1995-01-10 1997-08-19 International Business Machines Corporation Arrangement for projection displays employing reflective light valves

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63182987A (en) * 1987-01-24 1988-07-28 Canon Inc Light polarizing element for liquid crystal display projector
JPS63228887A (en) * 1987-03-18 1988-09-22 Matsushita Electric Ind Co Ltd Video projector
JPS63292892A (en) * 1987-05-26 1988-11-30 Kawasaki Heavy Ind Ltd Color image projecting device
JPS6468090A (en) * 1987-09-09 1989-03-14 Hitachi Ltd Multicolor projection type liquid crystal display
JPH01191219A (en) * 1988-01-26 1989-08-01 Mutoh Ind Ltd Drawing coordinate input device for cad
JPH03179336A (en) * 1990-11-29 1991-08-05 Casio Comput Co Ltd Projection type display device
US5638142A (en) * 1992-04-03 1997-06-10 Rank Brimar Limited Spatial light modulator system including a plurality of tiltable mirror devices and reflective means for equalizing the number of reflections from the tiltable mirror devices
US5658060A (en) * 1995-01-10 1997-08-19 International Business Machines Corporation Arrangement for projection displays employing reflective light valves

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