JPS63149625A - Projecting type liquid crystal display device - Google Patents
Projecting type liquid crystal display deviceInfo
- Publication number
- JPS63149625A JPS63149625A JP61297380A JP29738086A JPS63149625A JP S63149625 A JPS63149625 A JP S63149625A JP 61297380 A JP61297380 A JP 61297380A JP 29738086 A JP29738086 A JP 29738086A JP S63149625 A JPS63149625 A JP S63149625A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- light
- display device
- lens
- fresnel lens
- 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 71
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 238000002834 transmittance Methods 0.000 claims description 7
- 239000011521 glass Substances 0.000 abstract description 10
- 125000006850 spacer group Chemical group 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 description 8
- 239000004988 Nematic liquid crystal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000006386 memory function Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔概要〕
光反射層上に液晶パネルとフレネルレンズを積層し、こ
のフレネルレンズ上より照射した光を光反射層で反射さ
せ、この反射光を、情報が書き込まれ部分的に光透過率
が異なっている液晶ライトバルブで透過させ、該透過光
を投写レンズで集光し、該集光した光をスクリーンに映
写する投写型液晶表示装置であって、前記フレネルレン
ズと液晶ライトバルブとの間に投写レンズの焦点深度よ
り寸法が大きいスペーサ、或いは光透過層を設置するこ
とで、フレネルレンズの刻み模様がスクリ一層上に投写
されないようにした投写型液晶表示装置。[Detailed Description of the Invention] [Summary] A liquid crystal panel and a Fresnel lens are laminated on a light reflecting layer, and the light emitted from the Fresnel lens is reflected by the light reflecting layer, and this reflected light is applied to the area where information is written. A projection-type liquid crystal display device that transmits light through liquid crystal light valves having different light transmittances, condenses the transmitted light with a projection lens, and projects the condensed light on a screen, wherein the Fresnel lens and A projection type liquid crystal display device that prevents the engraved pattern of a Fresnel lens from being projected onto the screen by installing a spacer or a light transmitting layer whose size is larger than the depth of focus of the projection lens between the liquid crystal light valve and the liquid crystal light valve.
本発明は投写型液晶表示装置の構造に係り、特に該装置
のフレネルレンズの刻み模様がスクリーン上に投写され
ないようにした投写型液晶表示装置に関する。The present invention relates to the structure of a projection type liquid crystal display device, and more particularly to a projection type liquid crystal display device in which a carved pattern of a Fresnel lens of the device is prevented from being projected onto a screen.
光反射層上に液晶ライトバルブとフレネルレンズを積層
し、このフレネルレンズ上より照射した光を光反射層で
反射させ、この反射光を情報が書き込まれ部分的に光透
過率が異なっている液晶ライトバルブで透過させ、該透
過光を投写レンズで集光し、該集光した光をスクリーン
に映写する投写型液晶表示装置は装置が小型で低価格で
あるので、オーバーヘッドプロジェクト等に多く用いら
れている。A liquid crystal light valve and a Fresnel lens are laminated on a light-reflecting layer, and the light emitted from the Fresnel lens is reflected by the light-reflecting layer, and this reflected light is written with information and has partially different light transmittances. Projection-type liquid crystal display devices that transmit light through a light valve, condense the transmitted light with a projection lens, and project the condensed light onto a screen are often used for overhead projects because they are small and inexpensive. ing.
このような投写型液晶表示装置の従来の構造を第３図の
説明図に示す。The conventional structure of such a projection type liquid crystal display device is shown in the explanatory diagram of FIG.
図示するようにガラス基板１上には、蒸着によりアルミ
ニウム（八１）の金属膜よりなる反射層２が形成され、
その上には液晶ライトバルブ３が設置されている。この
液晶ライトバルブ３は対向するガラス基板４Ａ、４Ｂの
内面に対向するマトリックス型の電極５Ａ、５Ｂが形成
され、該ガラス基板に囲まれた空間部に液晶６が挿入さ
れた構造を示し、この上には凸レンズ状の突出部を多数
有する平板状のフレネルレンズ７が設置されている。As shown in the figure, a reflective layer 2 made of a metal film of aluminum (81) is formed on a glass substrate 1 by vapor deposition.
A liquid crystal light valve 3 is installed above it. This liquid crystal light valve 3 has a structure in which matrix-type electrodes 5A and 5B are formed on the inner surfaces of opposing glass substrates 4A and 4B, and a liquid crystal 6 is inserted into a space surrounded by the glass substrates. A flat Fresnel lens 7 having a large number of convex lens-shaped protrusions is installed above.
ここでパーソナルコンピュータ、或いはワードプロセッ
サで編集された情報を、マトリックス型電極５＾、５Ｂ
に電気信号として送出し、この電気信号によって液晶６
が部分的に透明、或いは白濁状に変化し、部分的に光の
透過率が異な、るようになる。一方、光源８よりフレネ
ルレンズ７を介して液晶バルブ３に光を照射する。する
とこの光は部分的に光の透過率の異なった液晶６を透過
し、光反射層２で反射し、再び液晶６を透過し、集光レ
ンズであるフレネルレンズ７によって投写レンズ９に集
光され、部分的に光のｉ３過率の異なった液晶６の画像
をスクリーン１０に大画面として写し出している。Here, the information edited with a personal computer or word processor is transferred to the matrix type electrodes 5^, 5B.
This electrical signal is sent to the LCD 6 as an electrical signal.
becomes partly transparent or cloudy, and the light transmittance changes partly. On the other hand, light is irradiated from the light source 8 to the liquid crystal bulb 3 via the Fresnel lens 7. Then, this light partially passes through the liquid crystal 6 with different light transmittances, is reflected by the light reflection layer 2, passes through the liquid crystal 6 again, and is focused onto the projection lens 9 by the Fresnel lens 7, which is a condensing lens. The images of the liquid crystal 6 having partially different i3 irradiances are projected on the screen 10 as a large screen.
ところで、この装置に用いられているフレネルレンズ７
は、プラスチック板の表面に細かい輪帯状の溝を切り、
全体として凸レンズの働きをするようにしたもので、こ
の輪帯状の溝が、従来の装置のようにフレネルレンズ７
と液晶ライトバルブ３が接するような構造をとっている
と、液晶６に投写レンズ９の焦点を合致させた場合、フ
レネルレンズ７にも投写レンズ９の焦点が合致すること
になり、そのためフレネルレンズ７の溝の刻み模様が、
スクリーン１０に投写される不都合を生ずる。By the way, the Fresnel lens 7 used in this device
Cuts fine annular grooves on the surface of the plastic plate,
The lens as a whole functions as a convex lens, and this annular groove serves as a Fresnel lens 7, unlike conventional devices.
If the structure is such that the liquid crystal light valve 3 is in contact with the liquid crystal light valve 3, when the focus of the projection lens 9 is made to match the liquid crystal 6, the focus of the projection lens 9 will also be made to match the Fresnel lens 7, and therefore the Fresnel lens The carved pattern of the 7 grooves is
This results in the inconvenience that the image is projected onto the screen 10.
本発明は上記した問題点を除去し、このフレネルレンズ
の輪帯状の刻み模様がスクリーン上に投写されないよう
にした投写型液晶表示装置の提供を目的とする。It is an object of the present invention to provide a projection type liquid crystal display device which eliminates the above-mentioned problems and prevents the annular cut pattern of the Fresnel lens from being projected onto the screen.
本発明の液晶表示装置は、光反射層上に液晶ライトバル
ブとフレネルレンズを積層し、該フレネルレンズ上より
照射した光を、情報が書き込まれて部分的に光の透過率
が異なっている液晶ライトバルブで透過させ、この光を
光反射層で反射させた後、再び液晶層に透過させ、更に
フレネルレンズで集光し、該集光した光を投写レンズに
てスクリーンに映写する投写型液晶表示装置に於いて、
前記フレネルレンズと液晶ライトバルブとの間にスペー
サ、或いは光透過層を設置した構成をとっている。The liquid crystal display device of the present invention has a liquid crystal light valve and a Fresnel lens laminated on a light reflecting layer, and the light irradiated from the Fresnel lens is transmitted to the liquid crystal display device, in which information is written and the light transmittance is partially different. A projection type liquid crystal that transmits light through a light valve, reflects it on a light reflection layer, transmits it through the liquid crystal layer again, condenses it with a Fresnel lens, and projects the condensed light onto a screen with a projection lens. In the display device,
A spacer or a light transmission layer is provided between the Fresnel lens and the liquid crystal light valve.
本発明の投写型液晶表示装置は、液晶ライトバルブとフ
レネルレンズとの間にスペーサを設けることで、液晶ラ
イトバルブとフレネルレンズの間の距離を投写レンズの
焦点深度以上の距離とし、液晶に投写レンズの焦点を合
致させた時に、その投写レンズの焦点がフレネルレンズ
上に位置しないようにして、フレネルレンズの刻み模様
がスクリーン上に投写されないようにする。In the projection type liquid crystal display device of the present invention, by providing a spacer between the liquid crystal light valve and the Fresnel lens, the distance between the liquid crystal light valve and the Fresnel lens is set to be longer than the depth of focus of the projection lens, and the image is projected onto the liquid crystal. To prevent the notched pattern of the Fresnel lens from being projected onto a screen by preventing the focal point of the projection lens from being located on the Fresnel lens when the lenses are focused.
以下、図面を用いながら本発明の一実施例につき詳細に
説明する。Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
第１図に本発明の投写型液晶表示装置の一実施例の説明
図を示す。FIG. 1 shows an explanatory diagram of an embodiment of a projection type liquid crystal display device of the present invention.
図示するようにガラス基板１上にはＡｌよりなる金属膜
を蒸着して光反射層２を形成する。そしてこの上にはマ
トリックス状の駆動用対向電極（図示せず）を有し、ネ
マティック液晶６を封入した液晶ライトバルブ３が設置
され、その上にはプラスチックよりなるスペーサ１１を
液晶ライトバルブ３の上の四隅に設け、その上に輪帯状
の小型の凸レンズが多数配設された平板状のフレネルレ
ンズ７が設置されている。As shown in the figure, a light reflecting layer 2 is formed on a glass substrate 1 by vapor depositing a metal film made of Al. A liquid crystal light valve 3 having a matrix-like driving counter electrode (not shown) and enclosing a nematic liquid crystal 6 is installed on top of this, and a spacer 11 made of plastic is placed above the liquid crystal light valve 3. A flat Fresnel lens 7 on which a large number of small annular convex lenses are arranged is installed at the upper four corners.
つまり本発明の装置が従来の装置と異なる点は、フレネ
ルレンズ７と液晶ライトバルブ３が直接接触しておらず
、その間にスペーサ１１を介在させている点にある。In other words, the device of the present invention differs from conventional devices in that the Fresnel lens 7 and the liquid crystal light valve 3 are not in direct contact with each other, but a spacer 11 is interposed between them.
このスペーサ１１の高さは、投写レンズ９の焦点深度以
上の寸法となるようにしている。The height of this spacer 11 is set to be greater than the depth of focus of the projection lens 9.
このようにすれば、投写レンズ９の焦点を液晶６の位置
に合致させ、情報を書き込んで部分的に光の透過率が異
なっている液晶６に、光源８より光を照射した時、フレ
ネルレンズ７の刻み模様７への位置に投写レンズ９の焦
点が合致するような現象が無くなり、スクリーン１０上
にフレネルレンズ７の刻み模様が投写されるような不都
合な現象が無くなる。In this way, when the focus of the projection lens 9 is aligned with the position of the liquid crystal 6, and when information is written and light is irradiated from the light source 8 onto the liquid crystal 6, which has partially different light transmittances, the Fresnel lens There is no longer a phenomenon in which the focus of the projection lens 9 matches the position of the notched pattern 7, and an inconvenient phenomenon in which the notched pattern of the Fresnel lens 7 is projected onto the screen 10 is eliminated.
第２図は本発明の他の実施例の構造を示す断面図である
。FIG. 2 is a sectional view showing the structure of another embodiment of the present invention.
図示するように本実施例が、第１の実施例と異なる点は
、液晶ライトバルブ３とフレネルレンズ７との間に透明
なプラスチック、または透明なガラス板のような光透過
層２１を設けた点にある。As shown in the figure, this embodiment differs from the first embodiment in that a light transmitting layer 21 such as a transparent plastic or transparent glass plate is provided between the liquid crystal light valve 3 and the Fresnel lens 7. At the point.
この光透過層２１の厚さは前記した投写レンズ９の焦点
深度以上の寸法であることが必要で、また本実施例のよ
うにフレネルレンズ７の刻み模様７Ａが、液晶ライトバ
ルブ３側に存在する場合には、この刻み模様７Ａ内に光
透過層２１が挿入された時、そのフレネルレンズ３がレ
ンズとしての機能を果たせなくなるので、この刻み模様
７Ａ内には空気層が存在するようにする。The thickness of this light transmitting layer 21 needs to be larger than the depth of focus of the projection lens 9 described above, and as in this embodiment, the notched pattern 7A of the Fresnel lens 7 is present on the liquid crystal light valve 3 side. In this case, when the light transmitting layer 21 is inserted into the notched pattern 7A, the Fresnel lens 3 will no longer function as a lens, so an air layer should exist in the notched pattern 7A. .
以上述べたように、本発明の投写型液晶表示装置によれ
ば、フレネルレンズの刻み模様がスクリーン上に投写さ
れないため、高品位の表示画像がスクリーン上に得られ
る効果がある。As described above, according to the projection type liquid crystal display device of the present invention, since the cut pattern of the Fresnel lens is not projected onto the screen, a high-quality display image can be obtained on the screen.
尚、本実施例では液晶にネマティック液晶を用いたが、
ネマティック液晶とコレステリック液晶が混在した液晶
よりなる相転移型液晶を用いることで、光学情、報を蓄
積するメモリ機能を持たせることもできる。In this example, a nematic liquid crystal was used as the liquid crystal, but
By using a phase change liquid crystal consisting of a mixture of nematic liquid crystal and cholesteric liquid crystal, it is also possible to provide a memory function for storing optical information.
更にＡｌの金属層よりなる反射膜２をガラス基板１上に
形成せずに液晶ライトバルブ３の裏面側に形成し、この
反射膜２を液晶ライトバルブ３の駆動用電極として用い
ると装置全体の構造が簡単な構造となる。Furthermore, if a reflective film 2 made of a metal layer of Al is formed on the back side of the liquid crystal light valve 3 instead of being formed on the glass substrate 1, and this reflective film 2 is used as a driving electrode for the liquid crystal light valve 3, the entire device will be The structure is simple.
以上述べたように、本発明の投写型液晶表示装置によれ
ば、フレネルレンズの刻み模様がスクリーン上に投写さ
れない高品位の表示画像が得られる効果がある。As described above, according to the projection type liquid crystal display device of the present invention, a high-quality display image can be obtained in which the cut pattern of the Fresnel lens is not projected onto the screen.
第１図は本発明の装置の第１の実施例の構造を示す斜視
図、
第２図は本発明の装置の第２の実施例の構造を示す断面
図、
第３図は従来の装置の構造を示す説明図である。
図に於いて、
１はガラス基板、２は反射層、３は液晶ライトバルブ、
４Ａ、４Ｂはガラス基板、５Ａ 、 ５Ｂはマ） ＩＪ
ックス電橿、６は液晶、７はフレネルレンズ、８はオ完
明偽″ｒｒ（狛例の訝明圓
第１図
漆発ｇジオ２更絵ダ％鉾句図Fig. 1 is a perspective view showing the structure of the first embodiment of the device of the present invention, Fig. 2 is a sectional view showing the structure of the second embodiment of the device of the present invention, and Fig. 3 is the structure of the conventional device. FIG. 2 is an explanatory diagram showing the structure. In the figure, 1 is a glass substrate, 2 is a reflective layer, 3 is a liquid crystal light valve,
4A and 4B are glass substrates, 5A and 5B are glass substrates) IJ
6 is a liquid crystal, 7 is a Fresnel lens, 8 is a complete false "rr" (an example of an example)
Claims (4)
レネルレンズ（７）を積層し、該フレネルレンズ（７）
上より照射した光を光反射層（２）で反射させ、該反射
光を、情報が書き込まれて部分的に光透過率が変化した
液晶（６）を透過させ、該透過光を投写レンズ（９）で
集光し、該集光した光をスクリーン（１０）に投写する
投写型液晶表示装置に於いて、前記フレネルレンズ（７
）と液晶ライトバルブ（３）との間にスペーサ（１１）
を設置したことを特徴とする投写型液晶表示装置。(1) A liquid crystal light valve (3) and a Fresnel lens (7) are laminated on the light reflection layer (2), and the Fresnel lens (7)
Light irradiated from above is reflected by the light reflection layer (2), the reflected light is transmitted through the liquid crystal (6) on which information has been written and the light transmittance has partially changed, and the transmitted light is passed through the projection lens ( In a projection type liquid crystal display device that collects light with a lens (9) and projects the collected light onto a screen (10), the Fresnel lens (7)
) and the liquid crystal light valve (3).
A projection type liquid crystal display device characterized by being installed with.
３）との間に光透過層（２１）を設けたことを特徴とす
る特許請求の範囲第１項記載の投写型液晶表示装置。(2) The Fresnel lens (7) and the liquid crystal light valve (
3) A projection type liquid crystal display device according to claim 1, further comprising a light transmitting layer (21) between the projection type liquid crystal display device and the projection type liquid crystal display device.
を前記液晶ライトバルブ（３）の駆動用電極として用い
たことを特徴とする特許請求の範囲第１項および第２項
に記載の投写型液晶表示装置。(3) The light reflecting layer (2) is formed of a metal layer, and the metal layer is used as a driving electrode for the liquid crystal light valve (3). The projection type liquid crystal display device described in .
移型液晶よりなることを特徴とする特許請求の範囲第１
項および第２項に記載の投写型液晶表示装置。(4) The liquid crystal (6) of the liquid crystal light valve (3) is made of a phase change type liquid crystal.
The projection type liquid crystal display device according to Items 1 and 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61297380A JP2525383B2 (en) | 1986-12-12 | 1986-12-12 | Projection type liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61297380A JP2525383B2 (en) | 1986-12-12 | 1986-12-12 | Projection type liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63149625A true JPS63149625A (en) | 1988-06-22 |
| JP2525383B2 JP2525383B2 (en) | 1996-08-21 |
Family
ID=17845739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61297380A Expired - Lifetime JP2525383B2 (en) | 1986-12-12 | 1986-12-12 | Projection type liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2525383B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0259788A (en) * | 1988-08-25 | 1990-02-28 | Fujitsu Ltd | Liquid crystal display device for enlarged projection |
| US5083854A (en) * | 1990-02-15 | 1992-01-28 | Greyhawk Systems, Inc. | Spatial light modulator with improved aperture ratio |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61156001A (en) * | 1984-12-27 | 1986-07-15 | Nippon Seiki Co Ltd | Display device |
-
1986
- 1986-12-12 JP JP61297380A patent/JP2525383B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61156001A (en) * | 1984-12-27 | 1986-07-15 | Nippon Seiki Co Ltd | Display device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0259788A (en) * | 1988-08-25 | 1990-02-28 | Fujitsu Ltd | Liquid crystal display device for enlarged projection |
| US5083854A (en) * | 1990-02-15 | 1992-01-28 | Greyhawk Systems, Inc. | Spatial light modulator with improved aperture ratio |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2525383B2 (en) | 1996-08-21 |
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