JPH0354594A - Projection type display device - Google Patents
Projection type display deviceInfo
- Publication number
- JPH0354594A JPH0354594A JP1190757A JP19075789A JPH0354594A JP H0354594 A JPH0354594 A JP H0354594A JP 1190757 A JP1190757 A JP 1190757A JP 19075789 A JP19075789 A JP 19075789A JP H0354594 A JPH0354594 A JP H0354594A
- 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.)
- Granted
Links
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Projection Apparatus (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、ビデオ映像や、コンピューターグラフィック
ス画像を表示する投写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 display device for displaying video images and computer graphics images.
［従来の技術］
従来の投写型表示装置は、光源から直接もしくは、周囲
へ発散しないように、鏡面筒で光を導く等の方法がとら
れていた。[Prior Art] Conventional projection display devices employ methods such as guiding light directly from a light source or using a mirror tube to prevent it from radiating into the surroundings.
［発明が解決しようとする課題］
しかし、前述の従来技術では、直接何もなくてライトバ
ルブへ照射すれば、周囲へ洩れが発生しスクリーン上の
輝度が低下し、周囲へ発散しないように鏡面筒で光を導
くと、スクリーン上の特に周辺部に輝度ムラや色ムラが
発生するという問題点を有する。そこで本発明は、この
ような問題点を解決するもので、その目的とするところ
は、輝度の低下が少なく、明るい画面でなお且つ輝度ム
ラ，色ムラの少ない投写表示画質の良い投写型表示装置
を提供するところにある。[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, if the light is irradiated directly onto the light bulb without any light, leakage occurs to the surroundings and the brightness on the screen decreases. When light is guided through a tube, there is a problem in that uneven brightness and color occur on the screen, especially in the peripheral areas. SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a projection display device that has a bright screen with little reduction in brightness, and has good projection display image quality with less uneven brightness and color. It is in a place where we provide.
［課題を解決するための手段］
本尭明の投写型表示装置は、光源から出射された略平行
な光を強度変調するライトバルブ、該ライトパルブを通
過した光をスクリーン上に拡大投写するとき、光源とラ
イトバルブの間に中央部に中空穴を有する凸レンズを有
することを特徴とする。[Means for Solving the Problems] The projection type display device of Takamei Hontaka includes a light valve that modulates the intensity of substantially parallel light emitted from a light source, and when enlarging and projecting the light that has passed through the light valve onto a screen, It is characterized by having a convex lens with a hollow hole in the center between the light source and the light valve.
［実施例］
第１図は、本発明の実施例における主要断画図であって
、光源から出射される光をリフレクターで略平行に出射
し、ライトバルブに至る前に中央部に中空穴を有する凸
レンズを一枚以上挿入することにより、周辺部に洩れた
光は凸レンズにより中央部へ集められることにより、本
来利用されない光をライトバルブへ導くことができる。[Embodiment] Fig. 1 is a main cross-sectional view of an embodiment of the present invention, in which light emitted from a light source is emitted approximately parallel to the reflector, and a hollow hole is provided in the center before reaching the light valve. By inserting one or more convex lenses, light leaking to the periphery is collected in the center by the convex lenses, allowing light that would otherwise not be used to be guided to the light valve.
第２図に示すように中央中空穴部分はライトパルブと同
寸法，同形状とすれば、非常に効果的に光を中央部にラ
イトバルブ内へ導くことができる。さらに、上記中央部
平面レンズを適当な距離間隔で多数配列することにより
、より多くの洩れようとする光を内側へ取り込むことが
できる。As shown in FIG. 2, if the central hollow hole has the same size and shape as the light bulb, light can be guided into the light bulb very effectively in the center. Furthermore, by arranging a large number of the central planar lenses at appropriate distance intervals, more light that would otherwise leak can be taken inside.
［発明の効果コ
以上述べたように、本発明によれば、光源とライトパル
プの間に、中央部に中空穴を有する凸レンズ群を挿入す
ることにより、周囲に散逸しようとする光を再び、中央
部へ導くことができ、光源の出射光束を有効利用効率が
良くなり、明るいスクリーン上の映像を提供することが
できると〜・う効果を有する。また鏡筒による強制的な
赦一防止に比して、ゆるやかな強度分布になるため輝度
ムラや、色ムラの少ない高画質を提供できるという効果
を有する。[Effects of the Invention] As described above, according to the present invention, by inserting a convex lens group having a hollow hole in the center between the light source and the light pulp, light that would otherwise be dissipated to the surroundings can be redirected. It has the effect that it can be guided to the center, the emitted light beam of the light source can be used more efficiently, and a bright image on the screen can be provided. In addition, compared to forcibly preventing blurring using a lens barrel, the intensity distribution is gentler, so it has the effect of providing high image quality with less uneven brightness and color.
第１図は、本発明の投写型表示装置の一実施例を示す主
要断面図。
第２図は、本発明の投写型表示装置の一実施例のレンズ
の光軸方向から見た平面図。
１・・・・・・・・・スクリーン
２・・・・・・・・・投写レンズ
３・・・・・・・・・ライトバルフ
４−ｃＬ， ４−ｂ ， ４−ｃ−ｖ＞ス５・・・・・
・・・・光 源
６・・・・・・・・・り７レクタ−
２１・・・・・・中空穴
２２・・・・・球酊レンズ部FIG. 1 is a main sectional view showing an embodiment of a projection type display device of the present invention. FIG. 2 is a plan view of an embodiment of the projection display device of the present invention as viewed from the optical axis direction of the lens. 1...Screen 2...Projection lens 3...Light bulb 4-cL, 4-b, 4-c-v>S5・・・・・・
・・・・Light source 6・・・・・・・Rector 21・・・Hollow hole 22・・・Ball lens part
Claims (1)
イトバルブ、該ライトバルブを通過した光をスクリーン
上に拡大投写するレンズを有する投写型表示装置におい
て、光源とライトバルブの間に中央部に中空穴を有する
凸レンズを一枚以上配したことを特徴とする投写型表示
装置。(1) In a projection display device that includes a light valve that modulates the intensity of substantially parallel light emitted from a light source and a lens that magnifies and projects the light that has passed through the light valve onto a screen, the center is located between the light source and the light valve. 1. A projection type display device, characterized in that one or more convex lenses each having a hollow hole are disposed therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1190757A JP2836107B2 (en) | 1989-07-24 | 1989-07-24 | Projection display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1190757A JP2836107B2 (en) | 1989-07-24 | 1989-07-24 | Projection display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0354594A true JPH0354594A (en) | 1991-03-08 |
| JP2836107B2 JP2836107B2 (en) | 1998-12-14 |
Family
ID=16263227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1190757A Expired - Lifetime JP2836107B2 (en) | 1989-07-24 | 1989-07-24 | Projection display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2836107B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04120950U (en) * | 1991-04-15 | 1992-10-29 | カシオ計算機株式会社 | light source device |
| JPH05182001A (en) * | 1991-12-28 | 1993-07-23 | Neoretsukusu:Kk | Bar code reader |
| US5938307A (en) * | 1995-08-18 | 1999-08-17 | Fujitsu Limited | Projection display apparatus using liquid crystal light bulb |
-
1989
- 1989-07-24 JP JP1190757A patent/JP2836107B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04120950U (en) * | 1991-04-15 | 1992-10-29 | カシオ計算機株式会社 | light source device |
| JPH05182001A (en) * | 1991-12-28 | 1993-07-23 | Neoretsukusu:Kk | Bar code reader |
| US5938307A (en) * | 1995-08-18 | 1999-08-17 | Fujitsu Limited | Projection display apparatus using liquid crystal light bulb |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2836107B2 (en) | 1998-12-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081009 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091009 Year of fee payment: 11 |
|
| EXPY | Cancellation because of completion of term |