JPS6124131A - Flat cathode-ray tube - Google Patents

Flat cathode-ray tube

Info

Publication number
JPS6124131A
JPS6124131A JP14461784A JP14461784A JPS6124131A JP S6124131 A JPS6124131 A JP S6124131A JP 14461784 A JP14461784 A JP 14461784A JP 14461784 A JP14461784 A JP 14461784A JP S6124131 A JPS6124131 A JP S6124131A
Authority
JP
Japan
Prior art keywords
electrode
electron beam
signal
grid
ray tube
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
Application number
JP14461784A
Other languages
Japanese (ja)
Other versions
JPH0425662B2 (en
Inventor
Kaoru Tomii
冨井　薫
Hiroshi Miyama
博 深山
Yoshikazu Kawachi
義和 河内
Jun Nishida
準 西田
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 JP14461784A priority Critical patent/JPS6124131A/en
Priority to US06/748,833 priority patent/US4703231A/en
Publication of JPS6124131A publication Critical patent/JPS6124131A/en
Publication of JPH0425662B2 publication Critical patent/JPH0425662B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
    • H01J31/126—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using line sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/22—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information
    • H04N9/24—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information using means, integral with, or external to, the tube, for producing signal indicating instantaneous beam position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/18—Phosphor screens
    • H01J2229/186—Geometrical arrangement of phosphors

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

PURPOSE:To equalize the characteristics of electron beam sources, by inserting an electrode in between a second and a third grid electrodes, and by keeping constant the operating conditions for the electron beam sources for making a single-horizontal-scanning-line image during a horizontal flyback time. CONSTITUTION:An electrode 45 has holes of a prescribed size and horizontally divided, like a second grid electrode 14. Voltages 12A, 12C, 12E... are sequentially applied from a vertical scanning power source 62. A prescribed voltage is applied to the second grid electrode 14 so that a prescribed beam passes through the hole of the grid electrode. For that purpose, a video signal 61 and an H-BL signal 63 are mixed with each other by a mixing circuit 68 and the mixed signal is amplified by an amplifier 64 so that the signal voltage is applied to the second grid 14. An electrical current flowing into the inserted electrode 45 is found out by a current detector 65 to determine the degree of irregularity in the quantity of electron beams which proceed from a cathode 10 to the inserted electrode 45 through the holes of the second grid electrode 14. A control signal is applied from a control circuit 67 to a cathode drive amplifier 60 in order to keep the electrical current at a constant level.

Description

【発明の詳細な説明】 産業上の利用分野 本発明はカラーテレビジョン受像機、計算機の端末ディ
スプレイ等に用いられる平板形陰極線管に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat cathode ray tube used in color television receivers, computer terminal displays, and the like.

従来例の構成とその問題点 本出願人による先行技術である平板形陰極線管として、
第１図に示す構造のものがある。実際は真空外囲器（ガ
ラス容器）によって各電極を内蔵した構造がとられるが
、図に訃いては内部電極を明確にするため、真空外囲器
は省略しである。また画像・文字等を表示する画面の水
平ならびに垂直方向を明確にするため、フェースプレー
ト部に水平方向（Ｈ）および垂直方向（Ｖ）を図示して
いる。Structure of conventional example and its problems As a flat cathode ray tube which is a prior art by the present applicant,
There is a structure shown in FIG. In reality, each electrode is housed in a vacuum envelope (glass container), but the vacuum envelope is omitted in the figure to make the internal electrodes clear. Further, in order to clarify the horizontal and vertical directions of the screen on which images, characters, etc. are displayed, the horizontal direction (H) and vertical direction (V) are illustrated on the face plate portion.

まずタングステン線の表面に酸化物陰極が形成された垂
直方向に長い線状カソード１０が水平方向に等間隔で独
立して複数本配置される。線状カソード１ｏの本数、な
らびに配置される間隔は設計事項であり、例えば表示画
面サイズが１０吋であるとすると、配置される水平方向
の間隔は約１０誌で２０本の線状カソードが垂直方向に
約１６゜駄の長さで配置される。線状カソード１ｏをは
さんでフェースプレート部９と反対側には、線状カソー
ド１ｏと近接して絶縁支持体１１上に垂直方向に等ピッ
チで、かつ電気的に分割されて水平方向に細長い垂直走
査電極１２が配置される。これらの垂直走査電極１２は
、通常のテレビジ・１７画像を表示するのであれば、垂
直方向に水平走査線の数（ＮＴＳＣ方式では約４８０本
）と同等の独立した電極として形成する。次に、線状カ
ソード１０とフェースプレート９との間には、線状カソ
ード１ｏ側より順次、線状カソード１ｏに対応した部分
に開孔が形成された面状の第１グリツド電極１３が配置
され、次に個々の線状カソード１０に対応して電気的に
互に絶縁し、かつ電子ビーム通過孔を有するビーム変調
用の第２グリツド電極１４が配置され、さらに第１グリ
ツド電極１３と同様な形状を有する第３グリツド電極１
５が配置される。次に各電極に設けられた開孔を通過し
てくる電子ビームに対し、水平方向の偏向を加えるため
の水平偏向電極１６が配置される。そしてフェースプレ
ート９の内面に螢光体とメタルバック電極から成る発光
層１７が配置される。螢光体は白黒画像表示の際は１層
でよいが、カラー表示の１際は水平方向に順次光（Ｒ）
、緑（Ｇ）、青（Ｂ）のストライプもしくはドツトとし
て形成される。First, a plurality of vertically long linear cathodes 10 each having an oxide cathode formed on the surface of a tungsten wire are independently arranged at equal intervals in the horizontal direction. The number of linear cathodes 1o and the spacing between them are design matters. For example, if the display screen size is 10 inches, the horizontal spacing between the 20 linear cathodes is approximately 10 inches, and the 20 linear cathodes are placed vertically. It is arranged at a length of about 16 degrees in the direction. On the opposite side of the face plate portion 9 across the linear cathode 1o, there are horizontally elongated strips that are electrically divided at equal pitches in the vertical direction on the insulating support 11 in close proximity to the linear cathode 1o. Vertical scanning electrodes 12 are arranged. These vertical scanning electrodes 12 are formed as independent electrodes having the same number of horizontal scanning lines in the vertical direction (approximately 480 in the NTSC system) if normal television 17 images are to be displayed. Next, between the linear cathode 10 and the face plate 9, a planar first grid electrode 13 having an opening formed in a portion corresponding to the linear cathode 1o is arranged sequentially from the linear cathode 1o side. Next, a second grid electrode 14 for beam modulation is arranged corresponding to each linear cathode 10 and is electrically insulated from each other and has an electron beam passage hole. The third grid electrode 1 has a shape of
5 is placed. Next, a horizontal deflection electrode 16 is arranged to apply a horizontal deflection to the electron beam passing through the aperture provided in each electrode. A light emitting layer 17 consisting of a phosphor and a metal back electrode is arranged on the inner surface of the face plate 9. One layer of phosphor is sufficient for black-and-white image display, but for color display, light (R) is sequentially applied in the horizontal direction.
, green (G), and blue (B) as stripes or dots.

次に、上記平板陰極線管の動作について第２図。Next, FIG. 2 shows the operation of the flat plate cathode ray tube.

第３図を用いて説明する。第２図は第１図に示した平板
形陰極線管の水平方向の断面構造である。This will be explained using FIG. FIG. 2 shows a horizontal cross-sectional structure of the flat cathode ray tube shown in FIG.

線状カソード１０を加熱することによって発生した電子
は、垂直走査電極１２に線状カソード１゜とはソ同じ電
位となる電圧が、そして第１グリツド電極１３には線状
カソード１０の電位よりも高い電圧が印加されることに
より第１グリツド電極１３の開孔に向って進む。第２図
において電子ビーム軌道を１８で示す。第１グリツド電
極１３の開孔を通過した電子ビームは、第２グリツド電
極１４によって変調される。カラー画像表示の場合には
、Ｒ−＋　Ｇ　−＋　Ｂ　−＋　Ｒ→Ｇ→Ｂ→・・と指
定された点順次の映像信号によって変調される。第２グ
リツド電極１４を通過した電子ビームは第３グリツド電
極１５によって、螢光体発光層１７上で小さなビームス
ポットとなるような集束作用をうける。The electrons generated by heating the linear cathode 10 are applied to the vertical scanning electrode 12 at a voltage that is the same potential as the linear cathode 1°, and to the first grid electrode 13 at a voltage that is higher than the potential of the linear cathode 10. The application of a high voltage causes it to advance toward the opening in the first grid electrode 13. In FIG. 2, the electron beam trajectory is indicated by 18. The electron beam passing through the apertures of the first grid electrode 13 is modulated by the second grid electrode 14. In the case of color image display, the image is modulated by a point-sequential video signal designated as R-+G-+B-+R→G→B→.... The electron beam passing through the second grid electrode 14 is focused by the third grid electrode 15 into a small beam spot on the phosphor light emitting layer 17.

次に水平偏向電極１６に、配線１６イ、１６０を通じて
鋸歯状波もしくは階段状の水平偏向電圧が印加され、電
子ビーム１８は水平方向に所定の幅で偏向され、フェー
スプレート９上の発光層１７を刺激して発光像を得る。Next, a sawtooth wave or step-like horizontal deflection voltage is applied to the horizontal deflection electrode 16 through the wiring lines 16a and 160, and the electron beam 18 is deflected horizontally by a predetermined width, and the light emitting layer 17 on the face plate 9 is deflected horizontally by a predetermined width. to obtain a luminescent image.

カラー画像表示を行なうには、前記したように各電子ビ
ームが発光層１７上を水平走査する時、電子ビームが入
射している色螢光体と対応した色の変調信号が第２グリ
ツド電極１４に印加される。To display a color image, when each electron beam horizontally scans the light emitting layer 17 as described above, a modulation signal of a color corresponding to the color phosphor on which the electron beam is incident is sent to the second grid electrode 14. is applied to

次に垂直走査について第３図を用いて説明する。Next, vertical scanning will be explained using FIG. 3.

線状カソード１ｏの背面に近接して水平方向に長く、垂
直方向には有効画面を形成するに必要な水平走査線の数
だけ、たとえばＮＴＳＣ方式の場合であ゛れば約４８０
本に分割された垂直走査電極１２が配置され、これらの
各電極には垂直走査用信号が印加される。前記したよう
に、線状カソード１０をとり囲む空間の電位を、線状カ
ソード１０の電位よりも正の電位あるいは負の電位とな
るように垂直走査電極１２の電圧を制御することにより
、線状カソード１０からの電子の発生は制御される。Close to the back of the linear cathode 1o, it is long in the horizontal direction, and in the vertical direction is equal to the number of horizontal scanning lines necessary to form an effective screen, for example, about 480 in the case of the NTSC system.
Vertical scanning electrodes 12 divided into books are arranged, and a vertical scanning signal is applied to each of these electrodes. As described above, by controlling the voltage of the vertical scanning electrode 12 so that the potential of the space surrounding the linear cathode 10 is more positive or negative than the potential of the linear cathode 10, Generation of electrons from cathode 10 is controlled.

この時、細状カンード１０と垂直走査電極１２との距離
が小さければ制御電圧は小さくてよく、たとえばその距
離を０．３肱程度にすればｓ　Ｖ、ｐ程度の電圧で電子
の発生を制御′することができる。垂直走査電極１２に
は、インターレース方式を採用しているテレビ画像の場
合、最初の１フイールド目においては垂直走査電極の１
２Ａ、Ｊ：り１水平走査期間（以下１Ｈ）のみビームが
発生する（以下ＯＮ）信号が、１２０には次の１）Ｉ間
ノミヒームがＯＮになる信号が、以下順次、垂直走査電
極１本おきに１Ｈ間のみビームがＯＮになる信号が印加
され、画面下部の１２Ｘが終了すると最初の１フイール
ドの垂直走査が完了する。次の第２フイールド目は、１
２Ｂより同様に１Ｈ間のみビームがＯＮとなる信号が印
加され、最終的に１２Ｙまでの走査によって１フレーム
の垂直走査が完了する。At this time, if the distance between the thin canard 10 and the vertical scanning electrode 12 is small, the control voltage may be small. For example, if the distance is set to about 0.3 degrees, the generation of electrons can be controlled with a voltage of about s V, p. 'can do. In the case of a television image that uses an interlaced method, the vertical scanning electrode 12 has one of the vertical scanning electrodes in the first field.
2A, J: A signal that generates a beam (hereinafter ON) for only one horizontal scanning period (hereinafter referred to as 1H), 120 a signal that turns on the chisel heel between 1) I, and then one vertical scanning electrode A signal is applied to turn on the beam only for 1H every other time, and when 12X at the bottom of the screen is completed, the vertical scanning of the first field is completed. The next second field is 1
Similarly, from 2B, a signal is applied to turn on the beam only during 1H, and one frame of vertical scanning is finally completed by scanning up to 12Y.

以上のような垂直走査および前記したビーム変調、水平
偏向により全画面を形成する平板形陰極線管において、
各電極の開孔を通過して螢光面に入射する電子ビーム量
は、カソードの電子放出特性のバラツキ、各電極開孔の
大きさのバラツキ等により一定ではない。このため、全
面白の画面を表示した時、部々的に暗い、または明るい
箇所が発生して一様な明るさの画像が得られず、画質を
極度に低下させる。In a flat cathode ray tube that forms the entire screen by vertical scanning, the beam modulation, and horizontal deflection as described above,
The amount of electron beams passing through the apertures of each electrode and entering the fluorescent surface is not constant due to variations in the electron emission characteristics of the cathode, variations in the size of each electrode aperture, and the like. For this reason, when a completely white screen is displayed, some dark or bright areas occur, making it impossible to obtain an image with uniform brightness, resulting in an extremely poor image quality.

発明の目的 本発明は上記平板形陰極線管のように、多数の電子ビー
ム発生源を有する平板形陰極線管において、各電子ビー
ム放出源の特性を均一に揃えるようにすることを目的と
する。OBJECTS OF THE INVENTION An object of the present invention is to uniformize the characteristics of each electron beam emitting source in a flat cathode ray tube having a large number of electron beam sources, such as the above-mentioned flat cathode ray tube.

発明の構成 本発明の平板陰極線管は第２グＩＪ　、ド電極と第３グ
リツド電極の間に、第２グリツド電極と同じ構造の電極
を１枚挿入し、水平帰線期間（以下Ｈ−ＢＬ期間）に１
水平走査線の画像を形成するための電子ビーム放出源の
動作条件を一定にして、前記挿入グリッド電極に流入す
る電子ビーム量が一定となるように電子ビーム放出量を
制御するようにした平板陰極線管である。Structure of the Invention In the flat cathode ray tube of the present invention, one electrode having the same structure as the second grid electrode is inserted between the second grid electrode and the third grid electrode, and a horizontal retrace period (hereinafter referred to as H-BL) is inserted between the second grid electrode and the third grid electrode. period) to 1
A flat plate cathode ray in which the operating conditions of an electron beam emission source for forming a horizontal scanning line image are kept constant, and the amount of electron beam emission is controlled so that the amount of electron beam flowing into the inserted grid electrode is constant. It's a tube.

実施例の説明 第４図に本発明の第１の実施例である平板形陰極線管の
斜視図を、第５図にはその水平方向断面図を示す。電極
４６以外は第１図、第２図と同じであるため、それらに
は同一符号を付して詳細な説明は省略するが、電極４６
は第２グリツド電極１４と同じように、所定の大きさの
開孔を有し、水平方向に分割されている。DESCRIPTION OF EMBODIMENTS FIG. 4 is a perspective view of a flat cathode ray tube according to a first embodiment of the present invention, and FIG. 5 is a horizontal sectional view thereof. Components other than the electrode 46 are the same as those in FIG. 1 and FIG.
Like the second grid electrode 14, it has openings of a predetermined size and is divided in the horizontal direction.

上記電極構成を有する平板形陰極線管の各電子ビーム放
出源１０からの電子ビーム量を制御する方法について第
６図、第７図を用いて説明する。A method of controlling the amount of electron beams from each electron beam emission source 10 of the flat cathode ray tube having the above electrode configuration will be described with reference to FIGS. 6 and 7.

垂直走査電極１２の動作については第１図の平板形陰極
線管と同じであり、垂直走査電源６２からは第７図に示
すように１２Ａ、１２Ｃ，１２１Ｃ・・・・・・と１Ｈ
間のみビームがＯＮとなる電圧が順次印加されてゆく。The operation of the vertical scanning electrode 12 is the same as that of the flat cathode ray tube shown in FIG.
A voltage is sequentially applied so that the beam is ON only during this period.

そして１Ｈ走査の開始部のＨ−ＢＬ期間、第２グリツド
電極１４の開孔から一定のビームが通過するように所定
の電圧（第７図４４）を第２グリツド電極１２Ｖｃ印加
する。このため映像信号６１とＨ−ＢＬ信号６３を混合
回路６８にて両者を混合し、これを増幅器６４にて増幅
して第７図４４の信号電圧を第２グリツド電極１４に印
加する。このＨ−ＢＬ信号６３が入った時には第２グリ
ツド電極１４の開孔を電子ビームが通過し、螢光面１７
に入射するため、この期間、電子ビームが螢光面１７に
到達しないようにしなければならない。したがって、Ｈ
−ＢＬ信号６３を増幅器６６にて増幅し、第３グＩＪ　
ツド電極１５に供給（第７図４６）して、Ｈ−ＢＬ期間
、電子ビームを遮断する。この時、各々の挿入電極４５
に流入する電流を電流検出器６５で検出することによっ
てカソード１０から第２グリツド電極１４の開孔を通過
して挿入電極４５までの電子ビーム量のバラツキが検出
でき、この検出電流が第７図４６のようにＨ−ＢＬ期間
内に一定値となるように制御回路６７から制御信号をカ
ソード駆動増幅器６ｏに送り、電子ビーム放出部のカソ
ード電位を制御する。制御されたカソード電位は１Ｈ間
保持される。During the H-BL period at the beginning of the 1H scan, a predetermined voltage (FIG. 7, 44) is applied to the second grid electrode 12Vc so that a constant beam passes through the aperture of the second grid electrode 14. For this purpose, the video signal 61 and the H-BL signal 63 are mixed in a mixing circuit 68, amplified in an amplifier 64, and the signal voltage shown in FIG. 44 is applied to the second grid electrode 14. When this H-BL signal 63 is received, the electron beam passes through the aperture of the second grid electrode 14, and the fluorescent surface 17
Therefore, it is necessary to prevent the electron beam from reaching the fluorescent surface 17 during this period. Therefore, H
- The BL signal 63 is amplified by the amplifier 66, and the third group IJ
The electron beam is supplied to the dot electrode 15 (FIG. 7, 46) to block the electron beam during the H-BL period. At this time, each insertion electrode 45
By detecting the current flowing into the electrode with the current detector 65, it is possible to detect variations in the amount of electron beam from the cathode 10 through the opening of the second grid electrode 14 to the insertion electrode 45, and this detected current is shown in FIG. A control signal is sent from the control circuit 67 to the cathode drive amplifier 6o to control the cathode potential of the electron beam emitting section so that it becomes a constant value during the H-BL period as shown in 46. The controlled cathode potential is maintained for 1H.

以上のように、水平走査期間の開始部のＨ−ＢＬ期間に
各電子ビーム放出源１ｏからの電子ビーム量が一定とな
るように、し、これを１Ｈ間保持することにより、螢光
面に入射する電子ビーム量のバラツキによる明暗の画像
雑音は除去することができる。As described above, by keeping the amount of electron beams from each electron beam emission source 1o constant during the H-BL period at the start of the horizontal scanning period, and maintaining this for 1H, the fluorescent surface Bright and dark image noise due to variations in the amount of incident electron beams can be removed.

なお上記実施例において、挿入電極４５に流入する電流
が一定となるようにするためカソード電位を制御したが
、制御回路６７からの制御信号を増幅器６４に入力して
、映像信号の増幅率をかえることによっても可能である
。In the above embodiment, the cathode potential is controlled so that the current flowing into the insertion electrode 45 is constant, but a control signal from the control circuit 67 is input to the amplifier 64 to change the amplification factor of the video signal. It is also possible by

次に、映像信号をカソードあるいは第１グＩＪ　ツド電
極に印加して電子ビームを変調する場合の第２の実施例
について説明する。第８図はカソード１０に映像信号を
印加する時の実施例で返り、第１グリツド１３に印加す
る場合はこれを第２グリツド電極１４のように各カソー
ド１０に対応して水平方向に互いに分割された電極を第
１グリツド電極とするだけでよく、よって説明は省略す
る。Next, a second embodiment will be described in which the electron beam is modulated by applying a video signal to the cathode or the first electrode. FIG. 8 shows an example of applying a video signal to the cathode 10, and when applying it to the first grid 13, it is divided horizontally into two grid electrodes 14 corresponding to each cathode 10. It is only necessary to use the electrode as the first grid electrode, so the explanation thereof will be omitted.

電極の基本構成は前記第１の実施例と殆んど同じである
が、挿入電極４５が分割されることなく１体化されてい
る点だけが異なる。このような電極構成を有する平板形
陰極線管において各電子ビーム放出源からの電子ビーム
量を均一にする制御方法について、第９図を用いて説明
する。垂直走査電極１２の動作については前記第１の実
施例と同じであるため同一符号を付して動作説明を省略
する。この実施例においても１Ｈ走査の開始部のＨ−Ｂ
Ｌ期、第２グリツド電極１４の開孔を一定ノ電子ヒーム
量が通過するように、カソード１０に所定の電圧（第１
０図８０）を印加する。したがってカソード１ｏにはビ
ーム電流検出用信号と映岱信号が印加されることになる
ため、映像信号９１とＨ−ＢＬ信号９３を混合回路９８
で混合し、これを増幅器９ｏにて増幅してカソード１０
に印加する。かぐしてＨ−ＢＬ期間においても電子ビー
ムは各電極開孔を通過して螢光面に入射するため、Ｈ−
ＢＬ期間中は螢光面にビームが入射しないようにする必
要がある。このため挿入電極４５にＨ−ＢＬ信号増幅器
９５からの信号（第１０図８５）を印加し、Ｈ−ＢＬ期
間、挿入電極４６でビームを遮断する。このようにすれ
ば、カソード１０から放出された電子ビームは対応する
第２グリツド電極１４に入射することになる。よってこ
の入射電子ビーム電流を検出器９７によって検出し、こ
の検出電流が第１０図８４のように、Ｈ−ＢＬ期間中に
所定の電流値となるように制御回路９６から制御信号を
第２グリッド駆動回路９４に送り、第２グリツド電圧を
制御する。制御された第２グリツド電圧は１Ｈ間保持さ
れる。The basic structure of the electrode is almost the same as that of the first embodiment, except that the insertion electrode 45 is integrated into one body without being divided. A control method for making the amount of electron beams from each electron beam emission source uniform in a flat cathode ray tube having such an electrode configuration will be explained with reference to FIG. Since the operation of the vertical scanning electrode 12 is the same as that in the first embodiment, the same reference numerals are given and the explanation of the operation will be omitted. In this embodiment as well, H-B at the start of 1H scanning
During the L period, a predetermined voltage (the first
0 Figure 80) is applied. Therefore, since the beam current detection signal and the video signal are applied to the cathode 1o, the video signal 91 and the H-BL signal 93 are sent to the mixing circuit 98.
The mixture is mixed by an amplifier 9o, and the cathode 10 is amplified by an amplifier 9o.
to be applied. Even during the H-BL period, the electron beam passes through each electrode aperture and enters the fluorescent surface.
During the BL period, it is necessary to prevent the beam from entering the fluorescent surface. For this purpose, a signal from the H-BL signal amplifier 95 (85 in FIG. 10) is applied to the insertion electrode 45, and the beam is interrupted by the insertion electrode 46 during the H-BL period. In this way, the electron beam emitted from the cathode 10 will be incident on the corresponding second grid electrode 14. Therefore, this incident electron beam current is detected by the detector 97, and a control signal is sent from the control circuit 96 to the second grid so that the detected current becomes a predetermined current value during the H-BL period, as shown in FIG. The voltage is sent to the drive circuit 94 to control the second grid voltage. The controlled second grid voltage is maintained for 1H.

′以上のように、本発明は、機械的要因で生ずる電子ビ
ーム放出源からの電子ビーム放出特性のバラツキを、水
平走査期間の開始部のＨ−ＢＬ期間内に検出し、これを
所定の特性となるように制御し、かつこれを１Ｈ間保持
することによって解消。'As described above, the present invention detects variations in the electron beam emission characteristics from an electron beam emission source caused by mechanical factors within the H-BL period at the beginning of the horizontal scanning period, and detects the variations in the electron beam emission characteristics from the electron beam emission source due to mechanical factors. This can be solved by controlling the problem so that it becomes , and holding it for 1H.

することができ、画質を向上することができる。image quality can be improved.

発明の効果 以上のように本発明は多数の電子ビーム放出源を有する
平板形陰極線管の各電子ビーム放出源からの電子ビーム
放出特性のバラツキをなくするため、水平走査期間の開
始部のＨ−ＢＬ期間中に、各電子ビーム放出特性を検出
し、これが所定の特性となるようにして１Ｈ間保持する
ことによってなされるものであり、したがって従来のよ
うに各電子ビーム放出特性のバラツキによる明暗の固定
パターン雑音を表示画像から取除くことができ、画質の
向上をもたらす。Effects of the Invention As described above, the present invention has the purpose of eliminating variations in electron beam emission characteristics from each electron beam emission source of a flat cathode ray tube having a large number of electron beam emission sources. This is done by detecting each electron beam emission characteristic during the BL period and holding it for 1 hour so that it becomes a predetermined characteristic. Fixed pattern noise can be removed from the displayed image, resulting in improved image quality.

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

第１図、第２図はそれぞれ本出願人による先行技術であ
る平板形陰極線管の電極構成を示す斜視図および断面図
、第３図は第１図の構成の垂直走査の動作説明図、第４
図および第５図は本発明の平板形陰極線管の第１の実施
例を示す斜視図および断面図、第６図はその駆動回路系
統図、第７図は本発明の第１の実施例における各電極に
印加される信号波形図、第８図は本発明の平板形陰極線
管の第２の実施例を示す断面図、第９図はその駆１２・
・・・・・垂直走査電極、１Ｑ・・・・・・線状カソー
ド、１３・・・・・・第１グリツド電極、１４・・・・
・・第２グリツド電極、１５・・・・・・第３グリツド
電極、４６・・・・・・挿入電極、１６・・・・・・水
平偏向電極、１７・・・・・・螢光面、６１．９１−・
・・・映像信号、６３．９３・・・・・水平ブランキン
グ信号、６０．９０・・・・・・カソード駆動増幅器、
６４・・・・・・映像信号増幅器、６５　、９７・・・
・・・電流検出器、６７．９６・・・・・制御信号発生
器。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名２図 ｈ’ｓ　　　−−−」−七一一一一一一一一一一一一−
ｌリー　　−＋＋−−ｆ″１−一一一一一一′シ　　　
　　　　　　　　　　　　　　　−−−−ノ２ど一−−
−−−−−−−−−−−−−−−一一一一一−−一一几
一一第５図 第６図 ／２　１０　１３　　ノ４４６ス５ 第７図 第８図 第９図 プ２　ｌθ　　／Ｊ　　　／４　４！；第１０図 ２Ｅ θ１２ノ・、Ｈ１゛″°°パ１−′°；−′４゛蚤！°
１″″′−−１＋・″゛パ′−’；、、−，，，Ｈ”−
”’ｌｊ”。1 and 2 are respectively a perspective view and a sectional view showing the electrode structure of a flat cathode ray tube according to the prior art by the present applicant, and FIG. 3 is an explanatory diagram of the vertical scanning operation of the structure shown in FIG. 4
5 are a perspective view and a sectional view showing a first embodiment of the flat cathode ray tube of the present invention, FIG. 6 is a drive circuit system diagram thereof, and FIG. 7 is a diagram showing the first embodiment of the flat cathode ray tube of the present invention. A diagram of signal waveforms applied to each electrode, FIG. 8 is a sectional view showing a second embodiment of the flat cathode ray tube of the present invention, and FIG.
... Vertical scanning electrode, 1Q ... Linear cathode, 13 ... First grid electrode, 14 ...
...Second grid electrode, 15...Third grid electrode, 46...Insert electrode, 16...Horizontal deflection electrode, 17...Fluorescent surface , 61.91-・
...Video signal, 63.93...Horizontal blanking signal, 60.90...Cathode drive amplifier,
64...Video signal amplifier, 65, 97...
...Current detector, 67.96...Control signal generator. Name of agent: Patent attorney Toshio Nakao and one other person
l Lee −++−−f″1−11111′shi
----No 2 Do-1--
----------------------11111--11几11Fig. 5Fig. P2 lθ /J /4 4! ;Fig. 10 2E θ12ノ・, H1゛″°°Pa1−′°;−′4゛flea!°
1""'--1+・"゛Pa'-';,,-,,,H"-
``'lj''.

Claims (3)

【特許請求の範囲】[Claims] （１）等間隔で配列された線状カソードと、線状カソー
ドの後方に線状カソードと直交する方向に細長く、かつ
等ピッチで配された走査電極と、前記線状カソードの前
方に螢光面に到達する電子ビーム量を規定する電極と、
その前方に配された複数の電極とを備え、前記複数の電
極の一つに水平走査開始部の水平ブランキング期間にビ
ーム遮断電圧を印加し、ビーム遮断電圧の印加された電
極の前に配置された電極に流入するビーム電流を検出し
てこの電流値が所定の電流値となるよう電子ビーム量を
制御することを特徴とする平板形陰極線管。(1) Linear cathodes arranged at equal intervals, scanning electrodes elongated in the direction perpendicular to the linear cathodes behind the linear cathodes and arranged at equal pitches, and fluorescent lights arranged in front of the linear cathodes. an electrode that defines the amount of electron beam reaching the surface;
A beam cutoff voltage is applied to one of the plurality of electrodes during the horizontal blanking period of the horizontal scanning start part, and the electrode is placed in front of the electrode to which the beam cutoff voltage is applied. A flat cathode ray tube characterized in that the amount of electron beam is controlled so that the beam current flowing into the electrode is detected and the current value becomes a predetermined current value. （２）複数の電極がビーム変調電極、電流検出電極およ
びビーム集束電極より成り、ビーム集束電極にビーム遮
断電圧を印加する特許請求の範囲第１項記載の平板形陰
極線管。(2) A flat cathode ray tube according to claim 1, wherein the plurality of electrodes are comprised of a beam modulation electrode, a current detection electrode, and a beam focusing electrode, and a beam cutoff voltage is applied to the beam focusing electrode. （３）複数の電極がビーム変調電極、ビーム集束電極お
よびこの両者の間に配された挿入電極より成り、挿入電
極にビーム遮断電圧を印加し、ビーム変調電極によりビ
ーム電流を検出する特許請求の範囲第１項記載の平板形
陰極線管。(3) A patent claim in which the plurality of electrodes consists of a beam modulation electrode, a beam focusing electrode, and an insertion electrode arranged between the two, a beam blocking voltage is applied to the insertion electrode, and a beam current is detected by the beam modulation electrode. A flat cathode ray tube according to scope 1.
JP14461784A 1984-06-26 1984-07-12 Flat cathode-ray tube Granted JPS6124131A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP14461784A JPS6124131A (en) 1984-07-12 1984-07-12 Flat cathode-ray tube
US06/748,833 US4703231A (en) 1984-06-26 1985-06-26 Flat type image display tube and display device using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14461784A JPS6124131A (en) 1984-07-12 1984-07-12 Flat cathode-ray tube

Publications (2)

Publication Number Publication Date
JPS6124131A true JPS6124131A (en) 1986-02-01
JPH0425662B2 JPH0425662B2 (en) 1992-05-01

Family

ID=15366196

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14461784A Granted JPS6124131A (en) 1984-06-26 1984-07-12 Flat cathode-ray tube

Country Status (1)

Country Link
JP (1) JPS6124131A (en)

Also Published As

Publication number Publication date
JPH0425662B2 (en) 1992-05-01

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