JPH0731224Y2 - Overhead projector using liquid crystal display device - Google Patents
Overhead projector using liquid crystal display deviceInfo
- Publication number
- JPH0731224Y2 JPH0731224Y2 JP1987086034U JP8603487U JPH0731224Y2 JP H0731224 Y2 JPH0731224 Y2 JP H0731224Y2 JP 1987086034 U JP1987086034 U JP 1987086034U JP 8603487 U JP8603487 U JP 8603487U JP H0731224 Y2 JPH0731224 Y2 JP H0731224Y2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- display device
- polarizing plate
- overhead projector
- 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.)
- Expired - Lifetime
Links
Landscapes
- Overhead Projectors And Projection Screens (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【考案の詳細な説明】 〈産業上の利用分野〉 本考案はオーバーヘッドプロジェクタ（以下OHPと記
す）の改良に関するもので、特に液晶を用いたオーバー
ヘッドプロジェクタに関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement of an overhead projector (hereinafter referred to as OHP), and more particularly to an overhead projector using liquid crystal.
〈従来の技術〉 透明フィルムに情報を記載し、これを投影して拡大表示
するOHPが実用化されている。<Prior Art> An OHP that puts information on a transparent film, projects the information, and displays it in an enlarged manner has been put into practical use.
この種のOHPは、表示情報源として近年上記透明フィル
ムに代ってドットマトリクス型液晶表示装置が用いら
れ、液晶表示面に現出された情報を光源で投射し、レン
ズ等の光学系を介して投影する。In this type of OHP, a dot matrix type liquid crystal display device has been used in recent years as a display information source instead of the transparent film, the information exposed on the liquid crystal display surface is projected by a light source, and an optical system such as a lens is used. To project.
〈考案が解決しようとする問題点〉 処で現在広く用いられている液晶表示装置は、液晶層を
挾持するガラス基板面に偏光板を重ねて用いられ、２枚
の偏光板の偏光方向の組合せを選ぶことによってポジ或
いはネガのいずれかの表示が行われる。<Problems to be solved by the invention> The liquid crystal display device that is widely used at present is such that a polarizing plate is used by stacking a polarizing plate on the surface of a glass substrate holding a liquid crystal layer, and a combination of polarization directions of two polarizing plates is used. By selecting, either positive or negative is displayed.
上記液晶表示装置を表示情報供給源とするOHPでは、２
枚の偏光板がいずれも液晶表示装置を構成するガラス基
板に密着して貼付けられている。そのため偏光板が固定
された状態にあってポジ・ネガの切換えができず、また
液晶表示面と同じ大きさの偏光板を貼付けねばならず、
経済性が悪いだけでなく製品歩留りを低下させるという
問題があった。In the OHP that uses the above liquid crystal display device as a display information supply source, 2
Each of the polarizing plates is closely attached to a glass substrate that constitutes the liquid crystal display device. Therefore, it is impossible to switch between positive and negative with the polarizing plate fixed, and a polarizing plate of the same size as the liquid crystal display surface must be attached.
There is a problem that not only the economy is bad but also the product yield is reduced.
〈問題点を解決するための手段〉 本考案は液晶表示装置を用いたOHPにおいて、液晶表示
装置のガラス板に配置する偏光板であって、投影レンズ
側に配備する偏光板を、光学レンズに近接させて且つ可
動自在に取付けて構成する。<Means for Solving Problems> In the OHP using the liquid crystal display device, the present invention is a polarizing plate arranged on the glass plate of the liquid crystal display device, and a polarizing plate arranged on the projection lens side is used as an optical lens. It is constructed so that it is placed close to and movable.
〈作用〉 液晶表示装置のガラス板に重ねる偏光板の一方は光学レ
ンズに近接させて配備されるため、支障なく液晶表示機
能を果すことができ、また可動自在に設けられるため、
他方の偏光板に対して角度を回転させることによってポ
ジ，ネガいずれの表示形態をも可能にする。<Function> Since one of the polarizing plates to be stacked on the glass plate of the liquid crystal display device is disposed close to the optical lens, the liquid crystal display function can be fulfilled without any trouble, and since it is movably provided,
By rotating the angle with respect to the other polarizing plate, both positive and negative display forms are possible.
〈実施例〉 図はOHPの概要を示す図で、表示情報を形成するために
透過型液晶表示装置１が設けられている。該液晶表示装
置１はドットマトリクス方式に構成され、文字，図形等
が入力する信号に基いて形成される。液晶表示装置１の
背面には光源２が配置され、液晶表示装置１を透過して
光学系３に投射される。光学系３は画像を拡大して投影
するためのレンズ31,32を組込んで構成されると共に、
光路を変更するための反射ガラス33を組込んで構成され
る。<Example> The figure is a diagram showing an outline of OHP, and a transmissive liquid crystal display device 1 is provided for forming display information. The liquid crystal display device 1 is constructed in a dot matrix system, and characters, figures, etc. are formed based on input signals. A light source 2 is arranged on the back surface of the liquid crystal display device 1 and is transmitted through the liquid crystal display device 1 to be projected on the optical system 3. The optical system 3 is configured by incorporating lenses 3 1 and 3 2 for enlarging and projecting an image, and
Constituted by incorporating a reflective glass 3 3 for changing the optical path.
上記構造のOHPにおいて、液晶層を挾む２枚の偏光板の
うち、光源２側の液晶ガラス基板面に配置される第１偏
光板41はほぼガラス基板に密着して設けられる。一方相
対する側の液晶ガラス基板に重ねられるべき第２偏光板
42は、上記レンズ31に近接して設けられ且つネジやガイ
ド溝方式により着脱自在に取付けられる。In OHP of the structure, of the two polarizing plates sandwiching the liquid crystal layer, the first polarizing plate 4 1 is disposed on the liquid crystal glass substrate surface of the light source 2 side it is provided substantially in close contact with the glass substrate. On the other hand, the second polarizing plate to be stacked on the liquid crystal glass substrate on the opposite side.
4 2 is mounted detachably by and screws and guide grooves scheme provided close to the lens 3 1.
また第２偏光板42はOHPにセットした状態で回転可能に
構成することもできる。従って第２偏光板42を回転させ
ることで偏光板の透過軸方向をセット状態で変更するこ
とができ、液晶表示装置に表示されている内容をポジ型
或いはネガ型のいずれかを選択して表示させることがで
きる。また偏光板に重ねてカラーフィルタを用いること
によりカラー変更も容易に行える。The second polarizing plate 4 2 can also be configured to be rotatable at setting OHP. Therefore it is possible to change the transmission axis of the polarizing plate in a set state by rotating the second polarizing plate 4 2, the contents displayed on the liquid crystal display device by selecting either positive or negative-working Can be displayed. In addition, the color can be easily changed by using a color filter on the polarizing plate.
〈効果〉 以上本考案によれば、比較的大面積に形成された液晶表
示装置を用いてOHPを構成する場合でも、偏光板を光学
レンズ側に近接させるため非常に小さい面積で済ませる
ことができ、経済性が著しく改善される。また偏光板を
可動自在としているためポジ，ネガの表示形態の変更が
自由になり、更にはカラー化も可能になり、OHPの機能
を著しく高めることができる。<Effect> As described above, according to the present invention, even when an OHP is configured by using a liquid crystal display device formed in a relatively large area, the polarizing plate is brought close to the optical lens side, so that an extremely small area can be achieved. , The economic efficiency is significantly improved. In addition, since the polarizing plate can be moved freely, it is possible to freely change the positive and negative display modes, and it is also possible to colorize, and the OHP function can be significantly enhanced.
図は本考案による一実施例を示す模型図である。 1:液晶表示装置、2:光源 3:光学系、41,42：偏光板The drawing is a model view showing an embodiment according to the present invention. 1: a liquid crystal display device, 2: light source 3: optical system, 4 1, 4 2: polarizing plate
Claims (1)
示面の画像を投影するオーバーヘッドプロジェクタにお
いて、 液晶層を挾んで設けられる２枚の偏光板のうち、光源側
に設けられ第１偏光板を、略ガラス基板面に密着させて
少なくとも液晶表示面と同じ大きさに形成し、 相対する液晶ガラス基板面側に設けられる第２偏光板
を、投影レンズに近接させて上記第１偏光板より小さく
形成するとともに可動自在に設けたことを特徴とする液
晶表示装置を用いたオーバーヘッドプロジェクタ。1. An overhead projector for forming display information on a liquid crystal display surface and projecting an image on the liquid crystal display surface, the first polarizing plate being provided on a light source side of two polarizing plates sandwiching a liquid crystal layer. The polarizing plate is formed in close contact with the surface of the glass substrate to form at least the same size as the liquid crystal display surface, and the second polarizing plate provided on the opposite side of the liquid crystal glass substrate is brought close to the projection lens to produce the first polarized light. An overhead projector using a liquid crystal display device, which is formed to be smaller than a plate and is movably provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987086034U JPH0731224Y2 (en) | 1987-06-02 | 1987-06-02 | Overhead projector using liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987086034U JPH0731224Y2 (en) | 1987-06-02 | 1987-06-02 | Overhead projector using liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63194325U JPS63194325U (en) | 1988-12-14 |
| JPH0731224Y2 true JPH0731224Y2 (en) | 1995-07-19 |
Family
ID=30941976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987086034U Expired - Lifetime JPH0731224Y2 (en) | 1987-06-02 | 1987-06-02 | Overhead projector using liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0731224Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54897A (en) * | 1977-06-03 | 1979-01-06 | Seiko Epson Corp | Liquid crystal display unit |
| JPS6341181U (en) * | 1986-09-03 | 1988-03-17 |
-
1987
- 1987-06-02 JP JP1987086034U patent/JPH0731224Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63194325U (en) | 1988-12-14 |
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