JP2000250431A - Projection type display device - Google Patents

Projection type display device

Info

Publication number
JP2000250431A
JP2000250431A JP11056496A JP5649699A JP2000250431A JP 2000250431 A JP2000250431 A JP 2000250431A JP 11056496 A JP11056496 A JP 11056496A JP 5649699 A JP5649699 A JP 5649699A JP 2000250431 A JP2000250431 A JP 2000250431A
Authority
JP
Japan
Prior art keywords
screen
red
blue
angle
display device
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.)
Withdrawn
Application number
JP11056496A
Other languages
Japanese (ja)
Inventor
Yasuhiro Saito
安弘 斎藤
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP11056496A priority Critical patent/JP2000250431A/en
Publication of JP2000250431A publication Critical patent/JP2000250431A/en
Withdrawn legal-status Critical Current

Links

Landscapes

  • Projection Apparatus (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PROBLEM TO BE SOLVED: To eliminate misconvergence when an electron beam changes by axis shifting and to improve shading by making the angles (angle of convergence) of the beam axes of red and blue to the beam axis of green as small as possible. SOLUTION: The 3-lens projection type display device comprises CRTs 1R, 1G, and 1B of red, green and blue, lenses 2R, 2G and 2B for enlarging and projecting images formed on the CRT surfaces, and a screen 3 on which the enlarged and projected images are projected. The screen 3 has its screen color change reduced by making the angle P of convergence having the beam axes by the CRTs 1R, 1G and 1B and lenses 2R, 2G and 2B have as small as possible. Further, end surfaces having larger aspect ratios among the aspect ratios of the CRTs 1R, 1G and 1B are arranged closely to each other. Further, optical system prisms for red and blue are used to reduce the angle of convergence.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、ＣＲＴ式投写型デ
ィスプレイ装置のスクリーン上画面の色変わり補正に関
する。[0001] 1. Field of the Invention [0002] The present invention relates to a color change correction on a screen of a CRT projection display device.

【０００２】[0002]

【従来の技術】従来、ＣＲＴ式投写型ディスプレイ装置
における画面の色変わり（シェーディング）は、ＣＲＴ
がインライン配列の場合スクリーン上で左右で青もしく
は赤っぽい現象があった。この現象は緑に光線軸に対す
る赤・青の光線軸のなす角度（集中角）の為に発生して
いる。この改善のため赤・緑・青の３色の光線軸がスク
リーン中央で一致しない軸ずらしという実質的な集中角
を低減する方法がとられていた。2. Description of the Related Art Conventionally, a color change (shading) of a screen in a CRT type projection display apparatus is performed by a CRT.
When there was an inline arrangement, there was a blue or reddish phenomenon on the left and right on the screen. This phenomenon occurs due to the angle (concentration angle) between the red and blue ray axes with respect to the ray axis of green. In order to improve this, a method of reducing a substantial concentration angle, that is, an axis shift in which the light axes of the three colors of red, green, and blue do not coincide at the center of the screen, has been adopted.

【０００３】[0003]

【発明が解決しようとする課題】ＣＲＴ式投写型ディス
プレイ装置における画面のシェーディングは集中角の大
きくなる、比較的画面の小さいディスプレイ装置で顕著
に現れる。画面のシェーディング補正の為、赤・緑・青
の３色の光線軸がスクリーン中央で一致しない軸ずらし
法がとられてきたが、電子ビーム量の変化による高圧変
化のため赤・緑・青の画面が均等な変化をせず、色ずれ
（コンバーゼンスずれ）となって画質を著しく劣化させ
てきた。The shading of the screen in the CRT type projection display apparatus becomes prominent in a display apparatus having a relatively small screen in which the concentration angle is large. In order to correct the shading of the screen, an axis shifting method has been adopted in which the light axes of the three colors red, green and blue do not coincide at the center of the screen. The screen does not change evenly, resulting in a color shift (convergence shift), which significantly degrades the image quality.

【０００４】図４は、従来の３ＣＲＴ，３レンズ式投写
型ディスプレイ装置の投写光学系の構成を示し、スクリ
ーン３上で赤・緑・青のそれぞれの光線軸が一致しない
軸ずらし光学系を採用している。図５は、従来の３ＣＲ
Ｔ式投写型ディスプレイ装置のＣＲＴの配置を示す。本
発明は、軸ずらしによる電子ビーム変化時のコンバーゼ
ンスずれを解消しシェーディングを改善することを目的
とする。FIG. 4 shows the configuration of a projection optical system of a conventional 3CRT, three-lens type projection display apparatus. are doing. FIG. 5 shows a conventional 3CR
2 shows an arrangement of a CRT of a T-type projection display device. SUMMARY OF THE INVENTION It is an object of the present invention to eliminate a convergence shift at the time of an electron beam change due to an axis shift and to improve shading.

【０００５】[0005]

【課題を解決するための手段】前記課題を解決するため
に、本発明の色変わり補正光学は緑の光線軸に対する赤
・青の光線軸の軸ずらしをすることなくシェーディング
の発生要因となっている緑の光線軸に対する赤・青の光
線軸のなす角度（集中角）Ｐを極力小さくする事を特徴
とするものである。In order to solve the above-mentioned problems, the color change correction optics of the present invention causes shading without shifting the red and blue light axes with respect to the green light axis. It is characterized in that the angle (concentration angle) P between the red and blue light axes with respect to the green light axis is made as small as possible.

【０００６】本発明によれば、従来はアスペクト比４対
３の赤・緑・青のＣＲＴを横向きにインラインに配列し
ていたが、同様のＣＲＴを縦向きにインラインに配列す
ることにより集中角を大幅に改善することができる光学
システムを提供できる。また、赤・青の投写レンズに光
線軸方向を変えるプリズムを加える事で、集中角を小さ
くしシェーディングを改善できるＣＲＴ式投写型ディス
プレイ装置を提供できる。According to the present invention, red, green, and blue CRTs having an aspect ratio of 4: 3 have been conventionally arranged in a horizontal direction inline, but similar CRTs are vertically arranged inline to achieve a concentrated angle. Can be provided. Further, by adding a prism for changing the direction of the light beam axis to the red and blue projection lenses, it is possible to provide a CRT type projection display device capable of reducing the concentration angle and improving shading.

【０００７】[0007]

【発明の実施の形態】本発明の請求項１に記載の発明
は、３ＣＲＴ３レンズ式投写型ディスプレイ装置におい
て画面スクリーンに対し、赤・緑・青の各光線軸のなす
集中角を極力小さくする事で画面色変わりを低減できる
投写型ディスプレイ装置を提供できるという作用を有す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, in a 3CRT three-lens projection type display device, the concentration angle of each of red, green and blue ray axes with respect to a screen screen is made as small as possible. Therefore, it is possible to provide a projection display device capable of reducing a change in screen color.

【０００８】請求項２に記載の発明は、使用するＣＲＴ
の配置をＣＲＴのアスペクト比の内、アスペクトの長い
端面をおのおの近接させて配置した請求項１記載の投写
型ディスプレイ装置の色変わり補正光学であり、画面ス
クリーンに対し、赤・緑・青の各光線軸のなす集中角を
極力小さくする事で画面色変わりを低減できる投写型デ
ィスプレイ装置を提供できるという作用を有する。The invention according to claim 2 uses a CRT to be used.
2. The color change correction optics of a projection display device according to claim 1, wherein the end faces having a long aspect in the aspect ratio of the CRT are arranged close to each other. By minimizing the concentration angle formed by the axes, it is possible to provide a projection display device capable of reducing the change in screen color.

【０００９】請求項３に記載の発明は、赤・青の投写光
学系にプリズムを有する請求項１記載の投写型ディスプ
レイ装置の色変わり補正光学であり、画面スクリーンに
対し、赤・緑・青の各光線軸のなす集中角を極力小さく
する事で画面色変わりを低減できる投写型ディスプレイ
装置を提供できるという作用を有する。According to a third aspect of the present invention, there is provided the color change correction optics of the projection type display apparatus according to the first aspect, wherein the red / blue projection optical system has a prism. By minimizing the angle of concentration formed by each ray axis, it is possible to provide a projection display apparatus capable of reducing a change in screen color.

【００１０】以下、本発明の投写型ディスプレイ装置に
ついて、図１から図５を用いて説明する。Hereinafter, a projection type display device according to the present invention will be described with reference to FIGS.

【００１１】（実施の形態）図１は本発明の一実施の形
態における３ＣＲＴ，３レンズ式投写型ディスプレイ装
置の投写光学系の構成を示す。図１において、符号１
Ｒ、１Ｇ、１Ｂはそれぞれ赤、緑、青のＣＲＴを示す。
符号２Ｒ、２Ｇ、２ＢはそれぞれＣＲＴ面上に構成され
た画像を拡大投写するためのレンズ、３は拡大投写され
た画像を映し出すスクリーンを表す。中央に配置された
緑の光学系の光線軸に対し、斜めから投写される赤また
は青の光学系の光線軸のなす角度Ｐを集中角という。(Embodiment) FIG. 1 shows a configuration of a projection optical system of a 3CRT, three-lens projection type display apparatus according to an embodiment of the present invention. In FIG.
R, 1G, and 1B denote red, green, and blue CRTs, respectively.
Reference numerals 2R, 2G, and 2B denote lenses for enlarging and projecting an image formed on the CRT surface, and numeral 3 denotes a screen that projects the enlarged and projected image. The angle P formed by the light axis of the red or blue optical system projected obliquely with respect to the light axis of the green optical system arranged at the center is referred to as a concentration angle.

【００１２】図２は、本発明の３ＣＲＴ式投写型ディス
プレイ装置のＣＲＴの配置を示す。図３は、集中角Ｐの
低減の為、赤および青の投写光学系にプリズム４Ｒ、４
Ｂを使用した３ＣＲＴ，３レンズ式投写型ディスプレイ
装置の投写光学系の構成を示す。FIG. 2 shows an arrangement of a CRT of a 3CRT type projection display apparatus according to the present invention. FIG. 3 shows that the prisms 4R, 4R,
3 shows a configuration of a projection optical system of a 3CRT, 3 lens type projection display apparatus using B.

【００１３】上記構成において、本発明装置は、画面ス
クリーンに対し、赤・緑・青の各光線軸のなす集中角を
極力小さくする事で画面色変わりを低減する構成とし
た。また、ＣＲＴのアスペクト比の内、アスペクトの長
い端面をおのおの近接させて配置した。さらに、赤・青
用光学系にプリズムを用いることにより集中角を小さく
した。In the above configuration, the apparatus of the present invention is configured to reduce the change in screen color by minimizing the concentration angle of each of the red, green and blue ray axes with respect to the screen screen. Further, the end faces having a long aspect in the aspect ratio of the CRT are arranged close to each other. Further, the use of a prism in the red / blue optical system reduces the concentration angle.

【００１４】[0014]

【発明の効果】以上のように、本発明によれば、３ＣＲ
Ｔ３レンズ式投写型ディスプレイ装置において画面スク
リーンに対し、赤・緑・青の各光線軸のなす集中角を極
力小さくする事で画面色変わりを低減する投写型ディス
プレイ装置を提供できるという効果が得られる。As described above, according to the present invention, 3CR
In the T3 lens type projection display device, an effect is obtained that a projection type display device that reduces the change in screen color can be provided by minimizing the concentration angle of each of the red, green and blue ray axes with respect to the screen screen.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の一実施の形態による投写型ディスプレ
イ装置の投写光学系の構成図FIG. 1 is a configuration diagram of a projection optical system of a projection display apparatus according to an embodiment of the present invention.

【図２】図１のＣＲＴ配置構成図FIG. 2 is a configuration diagram of the CRT arrangement of FIG. 1;

【図３】本発明の実施の形態による投写型ディスプレイ
装置投写光学系の第２の構成図FIG. 3 is a second configuration diagram of a projection display system projection optical system according to the embodiment of the present invention;

【図４】従来の投写型ディスプレイ装置投写光学系の構
成図FIG. 4 is a configuration diagram of a conventional projection display apparatus projection optical system.

【図５】従来の投写型ディスプレイ装置投写光学系のＣ
ＲＴ配置構成図FIG. 5 shows a conventional projection display apparatus projection optical system C.
RT configuration diagram

【符号の説明】[Explanation of symbols]

１Ｒ 赤ＣＲＴ １Ｇ 緑ＣＲＴ １Ｂ 青ＣＲＴ ２Ｒ 赤用投写レンズ ２Ｇ 緑用投写レンズ ２Ｂ 青用投写レンズ ３ スクリーン ４Ｒ 赤光学用プリズム ４Ｂ 青光学用プリズム 1R Red CRT 1G Green CRT 1B Blue CRT 2R Red projection lens 2G Green projection lens 2B Blue projection lens 3 Screen 4R Red optical prism 4B Blue optical prism

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 ３ＣＲＴ３レンズ式投写型ディスプレイ
装置において画面スクリーンに対し、赤・緑・青の各光
線軸のなす集中角を極力小さくする事で画面色変わりを
低減することを特徴とする投写型ディスプレイ装置。In a 3CRT three-lens projection display device, a projection display characterized in that a change in screen color is reduced by minimizing a concentration angle of each of red, green and blue ray axes with respect to a screen screen. apparatus. 【請求項２】 ＣＲＴのアスペクト比の内、アスペクト
の長い端面をおのおの近接させて配置したことを特徴と
する請求項１記載の投写型ディスプレイ装置。2. The projection display apparatus according to claim 1, wherein the end faces having a long aspect in the aspect ratio of the CRT are arranged close to each other. 【請求項３】 赤・青用光学系にプリズムを用いること
により集中角を小さくしたことを特徴とする請求項１記
載の投写型ディスプレイ装置。3. The projection type display device according to claim 1, wherein a concentration angle is reduced by using a prism in the red / blue optical system.
JP11056496A 1999-03-04 1999-03-04 Projection type display device Withdrawn JP2000250431A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11056496A JP2000250431A (en) 1999-03-04 1999-03-04 Projection type display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11056496A JP2000250431A (en) 1999-03-04 1999-03-04 Projection type display device

Publications (1)

Publication Number Publication Date
JP2000250431A true JP2000250431A (en) 2000-09-14

Family

ID=13028721

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11056496A Withdrawn JP2000250431A (en) 1999-03-04 1999-03-04 Projection type display device

Country Status (1)

Country Link
JP (1) JP2000250431A (en)

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