JPH0139629B2 - - Google Patents
Info
- Publication number
- JPH0139629B2 JPH0139629B2 JP20515382A JP20515382A JPH0139629B2 JP H0139629 B2 JPH0139629 B2 JP H0139629B2 JP 20515382 A JP20515382 A JP 20515382A JP 20515382 A JP20515382 A JP 20515382A JP H0139629 B2 JPH0139629 B2 JP H0139629B2
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- electron beam
- electrode
- current
- electron
- 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
Links
- 238000010894 electron beam technology Methods 0.000 claims description 24
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims 1
- 238000000605 extraction Methods 0.000 description 9
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
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
Landscapes
- Transforming Electric Information Into Light Information (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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ヨン受像機、電子計算
機の端末デイスプレイ等のカラー画像表示装置と
して利用される平板形陰極線管を用いた画像表示
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display device using a flat cathode ray tube, which is used as a color image display device for color television receivers, computer terminal displays, etc. .
従来例の構成とその問題点
平板形陰極線管として特開昭54−14063号公報、
特開昭55−33734号公報に示されるものがある。
この基本構造を第１図に示す。１０は直径10〜数
10ミクロンのタングステン線表面に酸化物熱電子
放出物質が塗着された線状カソードであり、これ
が複数本垂直面内で水平方向に延びるように一定
間隔で並べられている。１１は背面電極、１２は
カソード位置に対応し、水平方向（カソードの延
長軸方向）にある一定のピツチで設けられた開孔
１２ａを有する電子ビーム引出し電極である。こ
のカソード１０から電子ビームを取り出す方法と
しては特開昭54−14306号公報に述べられている。
これを第２図に示す。ビーム引き出し電極１２に
は一定電圧V2が背面電極１１には一定電圧V1が
印加され、その電圧関係はV2＞V1である。これ
らの電極１１，１２の間にカソード１０が設置さ
れ、これに抵抗Ｒを介して直流電圧VHが印加さ
れて加熱される。この加熱時の電位VHを他の電
極電位V1，V2よりも高くすると電子ビームはカ
ソード１０から放出されずカツトオフ状態とな
る。ビームを取り出したい時はカソード・パルス
発生器２３よりの負パルスをカソード１０に印加
し、その時のカソード電位をビーム引き出し電極
電位V2より低くなるようにすれば、ビーム引き
出し電極１２の方にむけて電子ビームがカソード
１０より放出される。ダイオード２４はこの時に
カソード加熱電流が逆流しないようにするために
設けている。Conventional structure and its problems Japanese Patent Application Laid-Open No. 14063/1983 as a flat cathode ray tube;
There is one shown in Japanese Patent Application Laid-Open No. 55-33734.
This basic structure is shown in FIG. 10 is the diameter 10 to number
It is a linear cathode with an oxide thermionic emission material coated on the surface of a 10 micron tungsten wire, and multiple cathodes are arranged at regular intervals so as to extend horizontally in a vertical plane. 11 is a back electrode, and 12 is an electron beam extracting electrode having openings 12a which correspond to the cathode position and are provided at a constant pitch in the horizontal direction (in the direction of the extension axis of the cathode). A method for extracting an electron beam from the cathode 10 is described in Japanese Patent Laid-Open No. 14306/1983.
This is shown in FIG. A constant voltage V 2 is applied to the beam extraction electrode 12 and a constant voltage V 1 is applied to the back electrode 11, and the voltage relationship is V 2 >V 1 . A cathode 10 is installed between these electrodes 11 and 12, and a DC voltage VH is applied to it via a resistor R to heat it. When the potential V H during this heating is made higher than the other electrode potentials V 1 and V 2 , the electron beam is not emitted from the cathode 10 and the cathode 10 is in a cut-off state. When you want to extract the beam, apply a negative pulse from the cathode pulse generator 23 to the cathode 10, and if you make the cathode potential at that time lower than the beam extraction electrode potential V2 , the beam will be directed toward the beam extraction electrode 12. An electron beam is emitted from the cathode 10. The diode 24 is provided to prevent the cathode heating current from flowing backward at this time.
再び第１図にもどり、以上のようにしてカソー
ド１０から放出された電子ビーム１７はビーム引
き出し電極１２の開孔部１２ａを通過し、それぞ
れの開孔部１２ａを通過した電子ビームは蛍光面
１６上で微小スポツトとなるように、垂直集束・
偏向系１３、および水平集束・偏向系１５にて集
束される。したがつて水平方向に一列に並んだ多
数の電子ビームスポツトが得られることになる。
さらにテレビジヨン等のように映像を表示するた
めに、各電子ビームは映像信号により変調系１４
にて変調されると同時に個々のビームは水平・垂
直に偏向される。この偏向領域は垂直方向に並べ
られたカソードの本数をｍ本とするなら、全画面
の垂直領域の１／ｍ、および水平方向にｎ個の電
子ビームが並んでいるなら全画面の水平領域の
１／ｎとなる。したがつてカソード１０に印加さ
れる負パルスは、全画面の垂直領域を電子ビーム
が走査する時間をＴとすると、Ｔ／ｎの時間の
間、カソードが負電位となるようなパルスであ
る。したがつて１本のカソード１０からＴ／ｎ時
間の間、電子ビームが放出され、隣接する次のカ
ソード１０は前のカソード１０からの電子放出が
途切れた瞬間、またＴ／ｎ時間、電子ビーム放出
をする。 Returning to FIG. 1 again, the electron beam 17 emitted from the cathode 10 as described above passes through the apertures 12a of the beam extraction electrode 12, and the electron beams that have passed through each aperture 12a reach the phosphor screen 16. vertically focused and
It is focused by a deflection system 13 and a horizontal focusing/deflection system 15. Therefore, a large number of electron beam spots arranged in a row in the horizontal direction are obtained.
Furthermore, in order to display images like on television, each electron beam is modulated by a video signal into a modulation system 14.
At the same time, the individual beams are deflected horizontally and vertically. If the number of cathodes arranged vertically is m, this deflection area is 1/m of the vertical area of the entire screen, and if n electron beams are arranged horizontally, then the horizontal area of the entire screen is It becomes 1/n. Therefore, the negative pulse applied to the cathode 10 is such that the cathode is at a negative potential for a time T/n, where T is the time it takes for the electron beam to scan the vertical region of the entire screen. Therefore, an electron beam is emitted from one cathode 10 for T/n time, and the next adjacent cathode 10 emits an electron beam for T/n time again at the moment when the electron emission from the previous cathode 10 is interrupted. make a release.
以上のようにｍ×ｎ個の電子ビームがそれぞれ
微小領域を水平・垂直に偏向されて全画面が構成
される。しかし、この方式の平板形陰極線管では
複数本のカソード１０が用いられているため、各
カソード１０から放出される電子ビーム量が異な
ると蛍光面１６上ではｍ本の明暗の帯状模様とな
り、画質を損ねる。この問題点に対する対策例は
従来皆無であつた。 As described above, the m×n electron beams are each deflected horizontally and vertically in a small area to form the entire screen. However, since a plurality of cathodes 10 are used in this type of flat cathode ray tube, if the amount of electron beams emitted from each cathode 10 is different, a pattern of m bright and dark bands will appear on the phosphor screen 16, resulting in poor image quality. damage. Until now, there have been no examples of countermeasures for this problem.
発明の目的
本発明は平板形陰極線管の有する上記明暗の帯
状模様の発生をなくし、画質を向上させるように
した画像表示装置を提供することを目的とするも
のである。OBJECTS OF THE INVENTION It is an object of the present invention to provide an image display device that eliminates the above-mentioned bright and dark striped pattern that occurs in flat cathode ray tubes and improves image quality.
発明の構成
本発明は複数本の線状カソード、電子ビーム集
束系、変調系、偏向系、加速系で構成されるシー
ト状電子ビーム形成部と、蛍光面を形成したフエ
ース部より成る平板形陰極線管の電子ビーム変調
系より前段にある一枚構成の面電極に流入するビ
ーム電流を、時系列で順次ビーム放出する各カソ
ードの動作タイミングに同調して検出して、この
電流値が各カソードについて同一になるように制
御するようにした画像表示装置。Structure of the Invention The present invention comprises a sheet-shaped electron beam forming section consisting of a plurality of linear cathodes, an electron beam focusing system, a modulation system, a deflection system, and an acceleration system, and a flat cathode ray consisting of a face section formed with a fluorescent screen. The beam current flowing into a single-layer plane electrode located before the electron beam modulation system of the tube is detected in synchronization with the operation timing of each cathode that sequentially emits a beam in time series, and this current value is calculated for each cathode. An image display device that is controlled to be identical.
実施例の説明 以下本発明の実施例を詳細に説明する。Description of examples Examples of the present invention will be described in detail below.
第３図に本発明の実施例における構成を示す。
３０は線状カソード、３１は背面電極、３２はビ
ーム引き出し電極、３３は垂直集束・偏向系であ
り、これらは第１図の線状カソード１０、背面電
極１１、ビーム引き出し電極１２、垂直集束・偏
向系１３と同一の電極構成である。 FIG. 3 shows the configuration of an embodiment of the present invention.
30 is a linear cathode, 31 is a back electrode, 32 is a beam extraction electrode, and 33 is a vertical focusing/deflection system. It has the same electrode configuration as the deflection system 13.
第１図に示した方式の平板形陰極線管では、電
子ビームの集束を水平・垂直別々に行ない、かつ
ビーム変調は垂直集束の後で行なつている。した
がつて垂直集束・偏向系３３を出る所では映像信
号によつて変調されず、水平方向にも未集束な帯
状直流ビームとなつているため、この垂直集束・
偏向系３３の最終電極にはある量のビーム電流が
流れ込む。この流れ込むビーム電流を電流検出器
３５で検出・増幅することにより各カソードから
の放出電流の量およびバラツキをしることができ
る。この電流検出器３５の出力波形を第４図に示
す。４１はその出力波形であり４２はｍ本の各カ
ソードに印加するパルス発生器３４からの負パル
スである。電流検出器３５の出力はサンプリング
ホールド、および誤差信号発生回路３６に送られ
る。このサンプリングホールド、誤差信号発生回
路３６ではカソードパルス発生器３４からのパル
スでもつて、各カソード３０からの放出電子ビー
ム電流に対応した電流値を取り出し、必要とする
ビーム電流値との差を検出し、その誤差信号をビ
ーム引き出し電極電圧制御回路３７に印加し、誤
差信号が発生しないように、すなわち必要とする
ビーム電流がいずれのカソード３０からも均一に
得られるようにビーム引き出し電極電圧を制御す
る。 In the flat cathode ray tube of the type shown in FIG. 1, the electron beam is focused separately horizontally and vertically, and beam modulation is performed after vertical focusing. Therefore, at the point where it exits the vertical focusing/deflection system 33, it becomes a band-shaped DC beam that is not modulated by the video signal and is also unfocused in the horizontal direction.
A certain amount of beam current flows into the final electrode of the deflection system 33. By detecting and amplifying this flowing beam current with the current detector 35, the amount and variation of the emitted current from each cathode can be determined. The output waveform of this current detector 35 is shown in FIG. 41 is its output waveform, and 42 is a negative pulse from the pulse generator 34 applied to each of the m cathodes. The output of the current detector 35 is sent to a sampling hold and error signal generation circuit 36. This sampling hold/error signal generation circuit 36 extracts the current value corresponding to the electron beam current emitted from each cathode 30 using the pulse from the cathode pulse generator 34, and detects the difference between the current value and the required beam current value. , the error signal is applied to the beam extraction electrode voltage control circuit 37, and the beam extraction electrode voltage is controlled so that no error signal is generated, that is, so that the required beam current is uniformly obtained from all cathodes 30. .
以上に述べた実施例はビーム電流値が一定値に
なるよう、ビーム引き出し電極３２の電圧を制御
したが、空間電荷制限領域でない領域でカソード
３０から電子ビームを取り出すような駆動方式に
於ては、誤差信号をもとに、カソード加熱電流を
制御してもよい。 In the embodiments described above, the voltage of the beam extraction electrode 32 is controlled so that the beam current value becomes a constant value. , the cathode heating current may be controlled based on the error signal.
また、ビーム電流検出を垂直集束・偏向系３３
の最終電極で行なう方法について述べたが、映像
信号でビーム変調される以前の一枚構成の面電極
であれば、いずれの電極でもよいことはいうまで
もない。これらの場合、ビーム量検出を一枚の面
電極で行なえるため、検出回路が１回路ですみ、
簡素化が図れる。 In addition, the vertical focusing/deflection system 33 is used to detect the beam current.
Although the method using the final electrode has been described, it goes without saying that any electrode may be used as long as it is a single-layer surface electrode before beam modulation with a video signal. In these cases, the beam amount can be detected using a single surface electrode, so only one detection circuit is required.
It can be simplified.
発明の効果
以上のように、本発明は複数本の線状カソー
ド、電子集束系、変調系、偏向系、加速系で構成
されるシート状電子ビーム形成部と、蛍光面を形
成したフエース部を備え、時系列で順次ビーム放
出する各カソードの動作タイミングに同調して、
電子ビーム変調系より前段にある一枚構成の面電
極に流入するビーム電流を検出し、この電流値が
各カソードについて同一になるように制御するよ
うにしたものであり、画面上の明暗の帯状模様の
発生を防止し、高い画質の映像を１個の検出回路
で可能としたものである。Effects of the Invention As described above, the present invention includes a sheet-like electron beam forming section composed of a plurality of linear cathodes, an electron focusing system, a modulation system, a deflection system, and an acceleration system, and a face section on which a fluorescent screen is formed. In preparation, the beam is synchronized with the operation timing of each cathode to sequentially emit a beam in chronological order.
The system detects the beam current flowing into a single-layer plane electrode located before the electron beam modulation system, and controls the current value to be the same for each cathode, which produces a bright and dark strip on the screen. This prevents the occurrence of patterns and makes it possible to produce high-quality images with a single detection circuit.
第１図は本発明に使用される平板形陰極線管の
基本構造を示す斜視図、第２図は従来の線状カソ
ードの駆動回路系を示す斜視図、第３図は本発明
の一実施例における画像表示装置の陰極線管駆動
回路を示す系統図、第４図は第３図の回路系統の
動作を示す要部波形図である。
１０，３０……線状カソード、１１，３１……
背面電極、１２，３２……ビーム引き出し電極、
１３，３３……垂直集束・偏向系、１４……変調
系、１５……水平集束・偏向系、１６……フエー
ス部、３４……カソードパルス発生器、３５……
電流検出器、３６……誤差信号発生回路、３７…
…電極電圧制御回路。
Fig. 1 is a perspective view showing the basic structure of a flat cathode ray tube used in the present invention, Fig. 2 is a perspective view showing a conventional linear cathode drive circuit system, and Fig. 3 is an embodiment of the present invention. FIG. 4 is a system diagram showing the cathode ray tube drive circuit of the image display device in FIG. 10,30... Linear cathode, 11,31...
Back electrode, 12, 32...beam extraction electrode,
13, 33...Vertical focusing/deflection system, 14...Modulation system, 15...Horizontal focusing/deflection system, 16...Face unit, 34...Cathode pulse generator, 35...
Current detector, 36...Error signal generation circuit, 37...
...Electrode voltage control circuit.
Claims (1)
変調系、偏向系、加速系で構成されるシート状電
子ビーム形成部と、透明基板上に蛍光面を形成し
たフエース部とを備え、時系列で順次ビーム放出
する各カソードの動作タイミングに同調して、電
子ビーム変調系以前の一枚の面電極に流入するビ
ーム電流を検出し、この電流値が各カソードに対
して同一になるように制御するようにしたことを
特徴とする画像表示装置。1 Multiple linear cathodes, electron beam focusing system,
It is equipped with a sheet-like electron beam forming section consisting of a modulation system, a deflection system, and an acceleration system, and a face section with a fluorescent screen formed on a transparent substrate, and is synchronized with the operation timing of each cathode to sequentially emit beams in time series. An image display device characterized in that a beam current flowing into one plane electrode before an electron beam modulation system is detected, and the current value is controlled to be the same for each cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20515382A JPS5994342A (en) | 1982-11-22 | 1982-11-22 | Picture display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20515382A JPS5994342A (en) | 1982-11-22 | 1982-11-22 | Picture display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5994342A JPS5994342A (en) | 1984-05-31 |
| JPH0139629B2 true JPH0139629B2 (en) | 1989-08-22 |
Family
ID=16502292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20515382A Granted JPS5994342A (en) | 1982-11-22 | 1982-11-22 | Picture display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5994342A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6190579A (en) * | 1984-10-09 | 1986-05-08 | Matsushita Electric Ind Co Ltd | Picture display device |
| JPS6276980A (en) * | 1985-09-30 | 1987-04-09 | Matsushita Electric Ind Co Ltd | Driving method for flat-type cathode ray tube |
-
1982
- 1982-11-22 JP JP20515382A patent/JPS5994342A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5994342A (en) | 1984-05-31 |
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