JPH08115690A - Flat image display device - Google Patents

Abstract

PURPOSE: To reduce aberrations at electrodes so as to greatly reduce luminescent lines and luminance unevenness so as to provide good picture quality by making the horizontal or vertical size of the diameter of an electron-beam hole in an electrode greater than a size calculated by use of a predetermined relational expression. CONSTITUTION: The (y) (vertical) dimension of a through hole in a signal electrode 4 is (by), which must be within a range of values obtained by use of a predetermined relational expression; i.e., the distance between a back electrode 1 and a tapping electrode 3 is (c), the distance between the electrodes 3, 4 is (d), the electrodes 1, 3, 4 have electric potentials, V0, V1, V2, respectively, and then an electric field E1 between the electrodes 1, 3 is approximately - -(V1-V0)/(c). An electric field E2 between the electrodes 3, 4 is approximately - (V2-V1) /(d). In accordance with a value (f) calculated by use of the formula (fx)=2(ax+ay)/ax.V1(E2-El), (by)>1.5ay(1+ d/b) is selected as the hole size. Therefore, an electron beam is made to pass away from the edge of the through hole in the electrode 4, so that aberrations can be greatly reduced.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【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型画
像表示装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel image display device used for a color television receiver, a terminal display of a computer and the like.

【０００２】[0002]

【従来の技術】近年、平板型画像表示装置が盛んに開発
されており、液晶ディスプレイ（ＬＣＤ）、エレクトロ
ルミネッセンスディスプレイ（ＥＬ）、発光ダイオード
ディスプレイ（ＬＥＤ）等が市場に登場しているが、輝
度、解像度、フルカラー化の点で、カラーブラウン管に
劣っている。そこでブラウン管並みの高品質の画像が得
られる電子ビームを用いて、カラーテレビジョン画像を
平板状の装置で表示することを目的として、スクリーン
上の画面をマトリクス状の区分に隙間なく分割し、各々
の区分毎に電子ビームを偏向・走査して蛍光体を発光さ
せ、全体としてカラーテレビジョン画像を構成する平板
型画像表示装置があり、画質、フルカラー化の点で充分
ブラウン管に匹敵するところまで開発が進んでいる。2. Description of the Related Art In recent years, flat panel image display devices have been actively developed, and liquid crystal displays (LCD), electroluminescence displays (EL), light emitting diode displays (LED), etc. have been introduced to the market, but the brightness , In terms of resolution and full color, it is inferior to color cathode ray tubes. Therefore, for the purpose of displaying a color television image on a flat panel device by using an electron beam that produces a high-quality image similar to that of a cathode ray tube, the screen on the screen is divided into matrix-shaped sections without any gaps. There is a flat panel type image display device that deflects and scans the electron beam for each section to emit a phosphor to form a color television image as a whole, and developed it to a level that is sufficiently comparable to a cathode ray tube in terms of image quality and full color. Is progressing.

【０００３】以下図面を参照しながら、上記した従来の
平板型画像表示装置の一例について説明する。An example of the above-mentioned conventional flat panel image display device will be described below with reference to the drawings.

【０００４】従来の平板型の画像表示装置として例えば
特開平１−１７３５５３号公報等が知られている。図６
は従来の平板型画像表示装置の基本構造を示す分解斜視
図であり、電子ビームが偏向されていない状態を示して
いる。図６において、５１は背面電極、５２は電子ビー
ム源としての線状熱陰極、５３は電子ビーム引き出し電
極、５４は信号電極、５５は第一集束電極、５６は第二
集束電極、５７は水平偏向電極、５８は垂直偏向電極で
あり、これらの構成部品を真空容器（図示せず）内に納
めてある。As a conventional flat-panel image display device, for example, Japanese Patent Application Laid-Open No. 1-173553 is known. Figure 6
FIG. 4 is an exploded perspective view showing a basic structure of a conventional flat panel image display device, showing a state in which an electron beam is not deflected. In FIG. 6, 51 is a back electrode, 52 is a linear hot cathode as an electron beam source, 53 is an electron beam extraction electrode, 54 is a signal electrode, 55 is a first focusing electrode, 56 is a second focusing electrode, and 57 is a horizontal electrode. The deflection electrodes 58 are vertical deflection electrodes, and these components are housed in a vacuum container (not shown).

【０００５】線状熱陰極５２は、図示するように一定間
隔で複数本平行に設けられている。これらの線状熱陰極
５２は例えばタングステン線の表面に酸化物陰極材料が
塗着されて構成されている。A plurality of linear hot cathodes 52 are provided in parallel at regular intervals as shown in the figure. These linear hot cathodes 52 are formed, for example, by coating an oxide cathode material on the surface of a tungsten wire.

【０００６】背面電極５１は板状の導電材からなり、線
状熱陰極５２に対し平行に設けられている。The back electrode 51 is made of a plate-shaped conductive material and is provided parallel to the linear hot cathode 52.

【０００７】引き出し電極５３は線状熱陰極５２をはさ
んで背面電極５１と対向し、電子ビームの貫通孔が線状
熱陰極５２に対応する場所にあけられている板状電極で
ある。The lead-out electrode 53 is a plate-like electrode that faces the back electrode 51 with the linear hot cathode 52 interposed therebetween and has an electron beam through hole formed at a location corresponding to the linear hot cathode 52.

【０００８】信号電極５４は、引き出し電極５３におけ
る貫通孔の各々に相対向する位置に所定間隔を介して複
数個設置された垂直方向に細長い導電板の列からなり、
各導電板においては、引き出し電極５３の貫通孔に相対
向する位置に、同様の貫通孔を有している。The signal electrode 54 is composed of a row of vertically elongated conductive plates arranged at a position facing each of the through holes of the extraction electrode 53 with a predetermined interval therebetween.
Each conductive plate has a similar through hole at a position facing the through hole of the extraction electrode 53.

【０００９】第一集束電極５５は、信号電極５４の貫通
孔と各々に対向する位置に貫通孔を有する導電板からな
る。The first focusing electrode 55 is made of a conductive plate having through holes at positions facing the through holes of the signal electrode 54.

【００１０】第二集束電極５６は、第一集束電極５５の
貫通孔に相対向する位置にスリット孔を有している導電
板である。The second focusing electrode 56 is a conductive plate having a slit hole at a position facing the through hole of the first focusing electrode 55.

【００１１】水平偏向電極５７は、同一平面上に互いに
空間を介して噛み合った２枚の櫛歯状の導電体から構成
されており２枚の櫛歯状導電体の間に作られた空間は、
第二集束電極５６のスリット孔と相対向している。The horizontal deflection electrode 57 is composed of two comb-tooth-shaped conductors meshed with each other on the same plane with a space therebetween, and the space formed between the two comb-tooth-shaped conductors is ,
It faces the slit hole of the second focusing electrode 56.

【００１２】垂直偏向電極５８も、２枚の櫛歯状の導電
板を同一平面上で空間を介して噛み合わせた構成からな
る。The vertical deflection electrode 58 also has a structure in which two comb-teeth-shaped conductive plates are intermeshed on the same plane through a space.

【００１３】引き出し電極５３から垂直偏向電極５８の
各電極間の間隔は等しく揃えられている。The intervals between the extraction electrodes 53 and the vertical deflection electrodes 58 are equal.

【００１４】スクリーン５９は、電子ビームの照射によ
って発光する蛍光体（図示せず）をガラス容器６１の内
面に塗布し、その上にメタルバック層（図示せず）が付
加されて構成される。The screen 59 is formed by applying a phosphor (not shown) which emits light when irradiated with an electron beam to the inner surface of the glass container 61 and adding a metal back layer (not shown) thereon.

【００１５】以上のように構成された平板型画像表示装
置について、以下その動作について説明する。The operation of the flat panel image display device constructed as above will be described below.

【００１６】まず、線状熱陰極５２を加熱した状態で背
面電極５１、引き出し電極５３に適切な電圧を印加し線
状熱陰極の電圧を個別に制御することにより、上方から
順にシート状の電子ビーム６２を発生させることができ
る。ただし図では簡単のためシート状ではなく、スクリ
ーン５９に到達する一束分の成分のみ示している。上記
のシート状の電子ビーム６２は、次に引き出し電極５３
の貫通孔によって分割・制限され、信号電極５４の貫通
孔に到達するが、この際に、信号電極５４の電圧を経時
的に制御することにより、絵素を表示するための映像信
号に応じて電子ビーム通過量を調節する。First, while the linear hot cathode 52 is heated, an appropriate voltage is applied to the back electrode 51 and the extraction electrode 53 to individually control the voltage of the linear hot cathode, so that the sheet-shaped electrons are sequentially arranged from the top. A beam 62 can be generated. However, for simplification, the figure does not show a sheet shape, but only one bundle of components reaching the screen 59 is shown. The sheet-shaped electron beam 62 described above is then extracted by the extraction electrode 53.
It is divided and limited by the through hole of the signal electrode 54 and reaches the through hole of the signal electrode 54. At this time, the voltage of the signal electrode 54 is controlled with time, so that the image signal for displaying the picture element can be displayed. Adjust the electron beam passage amount.

【００１７】信号電極５４を通過した電子ビーム６２は
次に第一集束電極５５、第二集束電極５６に到達し、貫
通孔、スリット孔を通過することによって集束、整形さ
れたのち、水平偏向電極５７の導電体間および垂直偏向
電極５８の導電体間に与えられる電位差（偏向電圧）に
よって水平および垂直に静電偏向される。さらにスクリ
ーン５９のメタルバック層には例えば１０ｋＶの高電圧
が印加されており、電子ビームは加速されてメタルバッ
クに衝突し蛍光体を発光させる。The electron beam 62 that has passed through the signal electrode 54 next reaches the first focusing electrode 55 and the second focusing electrode 56, is focused and shaped by passing through the through hole and the slit hole, and then the horizontal deflection electrode. Electrostatic deflection is performed horizontally and vertically by a potential difference (deflection voltage) applied between the conductors of 57 and between the conductors of the vertical deflection electrode 58. Further, a high voltage of, for example, 10 kV is applied to the metal back layer of the screen 59, and the electron beam is accelerated to collide with the metal back and cause the phosphor to emit light.

【００１８】図７は図６の構成の平板型画像表示装置を
横（Ｘ軸方向）から見た断面図であり、実際の電子ビー
ムの一束分の軌道は概ね図７の様になっている。FIG. 7 is a cross-sectional view of the flat panel image display device having the structure shown in FIG. 6 as seen from the side (X-axis direction). The actual trajectory of one electron beam bundle is roughly as shown in FIG. There is.

【００１９】[0019]

【発明が解決しようとする課題】しかしながら上記のよ
うな構成では、図７の様に、電子ビームが、電子ビーム
量を制限する引き出し電極５３の次に電子ビームが通過
する信号電極５４の貫通孔の縁の近傍を通過する場合が
あり、そこで発生する収差や電界の歪のためビーム電流
密度に偏りが生ずる。図８は図７でのスクリーン上での
１ビームあたりの輝度分布（または電流密度分布）を示
すものであるが、結果として図のように角状の輝度偏り
が発生する。したがってこれが画面状で輝線や輝度むら
となって現れ画質を劣化させる原因となるという問題点
を有していた。However, in the above structure, as shown in FIG. 7, the through hole of the signal electrode 54 through which the electron beam passes after the extraction electrode 53 for limiting the amount of the electron beam. May pass near the edge of the beam, and the beam current density is biased due to the aberration and distortion of the electric field generated there. FIG. 8 shows the luminance distribution (or current density distribution) per beam on the screen in FIG. 7, but as a result, angular luminance deviation occurs as shown in the figure. Therefore, there is a problem that this appears as a bright line or uneven brightness on the screen and causes deterioration of image quality.

【００２０】本発明は上記問題点に鑑み、電子ビーム量
を制限する電極の次の電極での収差を大幅に軽減し、収
差にともなう輝度偏りを実質上無くし、輝線や輝度むら
が極めて少なく、良好な画質を得ることができる平板型
画像表示装置を提供することを目的とする。In view of the above problems, the present invention significantly reduces the aberration at the electrode next to the electrode that limits the electron beam amount, substantially eliminates the brightness deviation due to the aberration, and has very few bright lines and uneven brightness. It is an object of the present invention to provide a flat panel image display device capable of obtaining good image quality.

【００２１】[0021]

【課題を解決するための手段】上記問題点を解決するた
めに本発明の平板型画像表示装置は、電子ビームを取り
出す取り出し電極の次に電子ビームが通過する電極の電
子ビーム通過孔径の水平寸法あるいは垂直寸法が、取り
出し電極の電位、取り出し電極の前後の電界、取り出し
電極の電子ビーム通過孔径、各々の電極間隔からの関係
式で求められる寸法以上である、或は電子ビームを制限
する制限電極の次に電子ビームが通過する電極の電子ビ
ーム通過孔径の水平寸法あるいは垂直寸法が、制限電極
の直前に電子ビームが通過する電極と制限電極との両電
極の電位、両電極の前後の電界、両電極の電子ビーム通
過孔径、各々の電極間隔からの関係式で求められる寸法
以上であるという構成を備えたものである。In order to solve the above problems, the flat panel image display device of the present invention is a horizontal size of the electron beam passage hole diameter of the electrode through which the electron beam passes next to the extraction electrode for taking out the electron beam. Alternatively, the vertical dimension is greater than or equal to the dimension determined by the relational expression from the potential of the extraction electrode, the electric field before and after the extraction electrode, the electron beam passage hole diameter of the extraction electrode, and the interval between the respective electrodes, or the limiting electrode that limits the electron beam. Next, the horizontal dimension or the vertical dimension of the electron beam passage hole diameter of the electrode through which the electron beam passes, the potential of both electrodes of the electrode through which the electron beam passes immediately before the limiting electrode and the limiting electrode, the electric field before and after both electrodes, The electron beam passage hole diameters of both electrodes are equal to or larger than the dimension obtained by the relational expression from the respective electrode intervals.

【００２２】[0022]

【作用】本発明は上記した構成によって、電子ビーム
が、電子ビーム量を制限する電極の次に電子ビームが通
過する電極の貫通孔の縁の近傍を通過することがなくな
り、そこでの収差が減少し電流密度の偏りが実質上無く
なり、輝線や輝度むらが発生しなくなる。According to the present invention, the electron beam does not pass near the edge of the through hole of the electrode through which the electron beam passes next to the electrode for limiting the amount of electron beam, and the aberration there is reduced. However, the deviation of the current density is substantially eliminated, and bright lines and uneven brightness do not occur.

【００２３】[0023]

【実施例】【Example】

（実施例１）以下本発明の第１の実施例の平板型画像表
示装置について、図面を参照しながら説明する。(Embodiment 1) Hereinafter, a flat panel image display apparatus according to a first embodiment of the present invention will be described with reference to the drawings.

【００２４】図１（ａ）は本発明の第１の実施例におけ
る平板型画像表示装置の基本構造を示すyz平面を見た断
面図であり電子ビームが偏向されていない状態を示して
いる。おおよその基本構造は図６に示す従来例と同様の
ため斜視図は省略する。FIG. 1A is a cross-sectional view showing the basic structure of the flat panel image display device according to the first embodiment of the present invention, which is viewed on the yz plane, and shows a state in which the electron beam is not deflected. A schematic basic structure is similar to that of the conventional example shown in FIG. 6, and a perspective view is omitted.

【００２５】図１において、１は背面電極、２は電子ビ
ーム源としての線状熱陰極、３は電子ビーム引き出し電
極、４は信号電極、５は第一集束電極、６は第二集束電
極、７は水平偏向電極、８は垂直偏向電極であり、これ
らの構成部品を真空容器（図示せず）内に納めてある。In FIG. 1, 1 is a back electrode, 2 is a linear hot cathode as an electron beam source, 3 is an electron beam extraction electrode, 4 is a signal electrode, 5 is a first focusing electrode, 6 is a second focusing electrode, Reference numeral 7 is a horizontal deflection electrode, 8 is a vertical deflection electrode, and these components are housed in a vacuum container (not shown).

【００２６】各構成部品の位置関係などは従来例に準ず
るため、ここでは省略する。従来例と異なる点を図１、
２を用いて説明する。図１（ａ），（ｂ）は本発明の第
１の実施例における基本構造を示す断面図であり、図１
（ｂ）は図１（ａ）の背面電極１から信号電極４までの
部分を拡大したものである。図２は引き出し電極の貫通
孔をxy平面側から見た図で水平幅ax、垂直幅ayとなって
いる。Since the positional relationship of each component is similar to the conventional example, it is omitted here. The difference from the conventional example is shown in FIG.
2 is used for the explanation. 1 (a) and 1 (b) are sectional views showing the basic structure of the first embodiment of the present invention.
FIG. 1B is an enlarged view of the portion from the back electrode 1 to the signal electrode 4 in FIG. FIG. 2 is a view of the through hole of the extraction electrode as seen from the xy plane side, which has a horizontal width ax and a vertical width ay.

【００２７】ここで信号電極４の貫通孔のｙ寸法をbyと
するとbyは、次に説明する関係式で得られる値の範囲に
入っている。When the y dimension of the through hole of the signal electrode 4 is by, the by is within the range of values obtained by the relational expression described below.

【００２８】先ず図１（ａ）に示す様に、背面電極１と
引き出し電極３との距離をc、引き出し電極３と信号電
極４との距離をdとする。背面電極１、引き出し電極
３、信号電極４の電位をそれぞれV0、V1、V2とする。First, as shown in FIG. 1A, the distance between the back electrode 1 and the extraction electrode 3 is c, and the distance between the extraction electrode 3 and the signal electrode 4 is d. The potentials of the back electrode 1, the extraction electrode 3, and the signal electrode 4 are V0, V1, and V2, respectively.

【００２９】すると背面電極１と引き出し電極３との間
の電界E1はおよそThen, the electric field E1 between the back electrode 1 and the extraction electrode 3 is about

【００３０】[0030]

【数５】 (Equation 5)

【００３１】引き出し電極３と信号電極４との間の電界
E2はおよそElectric field between the extraction electrode 3 and the signal electrode 4
E2 is approximately

【００３２】[0032]

【数６】 (Equation 6)

【００３３】ここで本実施例では、Here, in this embodiment,

【００３４】[0034]

【数７】 (Equation 7)

【００３５】という式で求められる値fにつき、fに基づ
きFor the value f obtained by the formula

【００３６】[0036]

【数８】 (Equation 8)

【００３７】というbyが孔寸法として選択されている。
fは引き出し電極３での垂直方向の電子レンズの焦点距
離に似た概念を持つ値で、引き出し電極３での電子レン
ズの強さとその符号（凸レンズ、凹レンズ）によって、
次の信号電極４の貫通孔を通過する広がりが決まる。f
はその広がり度合の指標となる。上記関係式は、発明者
らが図８の様な従来の輝度分布（または電流密度分布）
から、図３の様な輝度分布になる電圧や寸法の関係を実
験や数値解析等で調べた結果得られたものである。By is chosen as the hole size.
f is a value having a concept similar to the focal length of the electron lens in the vertical direction at the extraction electrode 3, and depending on the strength of the electron lens at the extraction electrode 3 and its sign (convex lens, concave lens),
The extent of the next signal electrode 4 passing through the through hole is determined. f
Is an index of the degree of spread. The above relational expression is based on the conventional luminance distribution (or current density distribution) as shown in FIG.
From the above, it is obtained as a result of investigating the relationship between the voltage and the dimensions which produce the luminance distribution as shown in FIG. 3 through experiments, numerical analysis and the like.

【００３８】以上のように構成された画像表示装置につ
いて、以下図１を用いてその動作を説明する。The operation of the image display device configured as described above will be described below with reference to FIG.

【００３９】電子ビームが信号電極４に到達するまでの
過程は従来例とほぼ同じであるため、その動作は省略す
る。Since the process until the electron beam reaches the signal electrode 4 is almost the same as that of the conventional example, its operation is omitted.

【００４０】その後も従来例とほぼ同様に電子ビームが
スクリーンまで到達する。しかし、ここで信号電極４の
貫通孔の垂直径byが前述の関係式で求めた寸法の範囲に
あるため、電子ビームは図１（ａ）の様に信号電極４の
貫通孔の縁より離れたところを通過する。一般に電子レ
ンズの収差・歪は電極近傍ほど大きくなるが、本実施例
ではそれらが発生しない様に十分な寸法関係を選択して
いるため、電子ビームが従来例と同様にスクリーンまで
達したときに、結果的にそこでの輝度分布は１ビームあ
たり図３の様にすることが出来る。After that, the electron beam reaches the screen almost in the same manner as in the conventional example. However, since the vertical diameter by of the through hole of the signal electrode 4 is within the range of the dimension obtained by the above relational expression, the electron beam is separated from the edge of the through hole of the signal electrode 4 as shown in FIG. Pass through. Generally, the aberration and distortion of the electron lens become larger near the electrodes, but in this embodiment, the dimensional relationship is selected so that they do not occur, so when the electron beam reaches the screen as in the conventional example. As a result, the luminance distribution there can be set as shown in FIG. 3 per beam.

【００４１】（実施例２）第一の実施例は引き出し電極
３が電子ビームを制限している構成であるが、次に第２
の実施例として、電子ビームを制限している電極より前
に電子レンズ系が存在する構成について図面を参照しな
がら説明する。(Embodiment 2) In the first embodiment, the extraction electrode 3 limits the electron beam.
As an example of the above, a configuration in which an electron lens system is present in front of an electrode that limits an electron beam will be described with reference to the drawings.

【００４２】図４（ａ）は本発明の第２の実施例におけ
る平板型画像表示装置の基本構造を示すyz平面を見た断
面図であり電子ビームが偏向されていない状態を示して
いる。おおよその基本構造は図６に示す従来例と同様の
ため斜視図はこれも省略する。また電極の配列順も第１
の実施例と同じであるため図面では同じ番号を付けてい
る。FIG. 4A is a cross-sectional view showing the basic structure of the flat panel image display device according to the second embodiment of the present invention, which is viewed on the yz plane and shows a state in which the electron beam is not deflected. Since a rough basic structure is similar to that of the conventional example shown in FIG. 6, a perspective view is also omitted. Also, the order of electrode arrangement is first
Since they are the same as those in the embodiment of FIG.

【００４３】本実施例の構成が従来例や第１の実施例と
異なるのは、電子ビームをy方向に制限している電極が
引き出し電極３ではなく信号電極４であることである。The structure of this embodiment is different from the conventional example and the first embodiment in that the electrode that limits the electron beam in the y direction is not the extraction electrode 3 but the signal electrode 4.

【００４４】このような構成の場合、もし信号電極４の
次にある第一集束電極５の貫通孔の縁の近傍を電子ビー
ムが通過するか否かで、そこでの収差の影響が決定され
る。In the case of such a configuration, the influence of aberration is determined depending on whether or not the electron beam passes near the edge of the through hole of the first focusing electrode 5 next to the signal electrode 4. .

【００４５】図４（ｂ）は図４（ａ）の背面電極１から
第１集束電極５までの部分を拡大したものである。図５
は信号電極４の貫通孔をxy平面側から見た図で水平幅a'
x、垂直幅a'yとなっている。FIG. 4B is an enlarged view of the portion from the back electrode 1 to the first focusing electrode 5 in FIG. 4A. Figure 5
Is the horizontal width a'in the view of the through hole of the signal electrode 4 from the xy plane side.
x, vertical width a'y.

【００４６】ここで本実施例では第一集束電極５の貫通
孔の垂直径をb'yとするとb'yは次に説明する関係式で得
られる値の範囲に入っている。Here, in this embodiment, assuming that the vertical diameter of the through hole of the first focusing electrode 5 is b'y, b'y is within the range of values obtained by the relational expression described below.

【００４７】先ず図４（ｂ）に示す様に、背面電極１と
引き出し電極３との距離をh、引き出し電極３と信号電
極４との距離をc'、信号電極４と第１集束電極５との距
離をd'とする。背面電極１、引き出し電極３、信号電極
４、第１集束電極５の電位をそれぞれV0、V1、V2、V3と
する。また引き出し電極３の貫通孔を水平幅g'x、垂直
幅g'yとする。First, as shown in FIG. 4B, the distance between the back electrode 1 and the extraction electrode 3 is h, the distance between the extraction electrode 3 and the signal electrode 4 is c ', and the signal electrode 4 and the first focusing electrode 5 are The distance to and is d '. The back electrode 1, the extraction electrode 3, the signal electrode 4, and the first focusing electrode 5 have potentials V0, V1, V2, and V3, respectively. Further, the through hole of the extraction electrode 3 has a horizontal width g'x and a vertical width g'y.

【００４８】すると背面電極１と引き出し電極３との間
の電界E0はおよそThen, the electric field E0 between the back electrode 1 and the extraction electrode 3 is approximately

【００４９】[0049]

【数９】 [Equation 9]

【００５０】引き出し電極３と信号電極４との間の電界
E1はおよそElectric field between the extraction electrode 3 and the signal electrode 4
E1 is approximately

【００５１】[0051]

【数１０】 [Equation 10]

【００５２】信号電極４と第１集束電極５との間の電界
E2はおよそElectric field between the signal electrode 4 and the first focusing electrode 5
E2 is approximately

【００５３】[0053]

【数１１】 [Equation 11]

【００５４】ここで本実施例では、Here, in this embodiment,

【００５５】[0055]

【数１２】 (Equation 12)

【００５６】という式で求められる値f1、f0につき、f
1、f0に基づきFor the values f1 and f0 obtained by the equation
1, based on f0

【００５７】[0057]

【数１３】 (Equation 13)

【００５８】というb'yが孔寸法として選択されてい
る。f1、f0は各々信号電極４、引き出し電極３での垂直
方向の電子レンズの焦点距離に似た概念を持つ値で、両
電極での電子レンズの強さとその符号（凸レンズ、凹レ
ンズ）によって、次の第１集束電極５の貫通孔を通過す
る広がりが決まる。これらの関係式に付いても、発明者
らが図８の様な従来の輝度分布（または電流密度分布）
から、図３の様な輝度分布になる電圧や寸法の関係を実
験や数値解析等で調べた結果得られたものである。B'y is chosen as the pore size. f1 and f0 are values having a concept similar to the focal length of the electron lens in the vertical direction at the signal electrode 4 and the extraction electrode 3, respectively. Depending on the strength of the electron lens at both electrodes and its sign (convex lens, concave lens), The width of the first focusing electrode 5 passing through the through hole is determined. With respect to these relational expressions, the inventors have already used the conventional luminance distribution (or current density distribution) as shown in FIG.
From the above, it is obtained as a result of investigating the relationship between the voltage and the dimensions which produce the luminance distribution as shown in FIG.

【００５９】以上のように構成された画像表示装置につ
いて、以下図４を用いてその動作を説明する。The operation of the image display device configured as described above will be described below with reference to FIG.

【００６０】電子ビームが信号電極４に到達するまでの
過程は従来例とほぼ同じであるため、その動作は省略す
る。ここで電子ビームは垂直方向に制限を受ける。Since the process until the electron beam reaches the signal electrode 4 is almost the same as that of the conventional example, its operation is omitted. Here, the electron beam is vertically restricted.

【００６１】その後も従来例とほぼ同様に電子ビームが
スクリーンまで到達する。しかし、ここで第１集束電極
５の貫通孔の垂直径b'yが前述の関係式で求めた寸法の
範囲にあるため、電子ビームは図４（ａ）の様に第１集
束電極５の貫通孔の縁より離れたところを通過する。す
なわち本実施例でも収差・歪が発生しない様に十分な寸
法関係を選択しているため、電子ビームが従来例と同様
にスクリーンまで達したときに、結果的にそこでの輝度
分布は１ビームあたり図３の様にすることが出来る。After that, the electron beam reaches the screen almost in the same manner as in the conventional example. However, since the vertical diameter b'y of the through hole of the first focusing electrode 5 is within the range of the dimension obtained by the above-mentioned relational expression, the electron beam is emitted from the first focusing electrode 5 as shown in FIG. Passes away from the edge of the through hole. That is, since the dimensional relationship is selected sufficiently so that aberrations and distortions do not occur in this embodiment as well, when the electron beam reaches the screen as in the conventional example, as a result, the luminance distribution there is one beam. It can be as shown in FIG.

【００６２】従って、電子ビームを制限している電極よ
り前に電子レンズ系が存在する構成であっても本実施例
のように電極寸法を選択された構成であれば第１の実施
例と同様の効果を得ることが出来る。Therefore, even if the electron lens system is present before the electrode that limits the electron beam, the same as in the first embodiment as long as the electrode dimensions are selected as in this embodiment. The effect of can be obtained.

【００６３】なお、両実施例において、図面におけるＸ
軸とＹ軸とを入れ換えれば垂直偏向電極は水平偏向電極
となるわけで、実施例中の「垂直」、「水平」という表
現やＸ軸、Ｙ軸の方向は、特に本発明を制限するもので
はない。In both examples, X in the drawings
Since the vertical deflection electrode becomes a horizontal deflection electrode if the axis and the Y axis are interchanged, the expressions “vertical” and “horizontal” and the directions of the X axis and the Y axis in the embodiments particularly limit the present invention. Not a thing.

【００６４】また電極の一つの貫通孔径が、Ｚ軸方向に
いくに従って広がる等のテーパ状の孔を用いた構成も存
在するが、その場合には、そのひとつの孔に対して最小
の寸法を、本発明で標記している孔の寸法として扱う事
により、同様の効果を得る事ができる。There is also a structure using a tapered hole in which the diameter of one through-hole of the electrode expands in the Z-axis direction, but in that case, the minimum size for that one hole is set. The same effect can be obtained by treating it as the size of the hole described in the present invention.

【００６５】[0065]

【発明の効果】以上のように本発明は、電子ビームを取
り出す取り出し電極の次に電子ビームが通過する電極の
電子ビーム通過孔径の水平寸法あるいは垂直寸法が、取
り出し電極の電位、取り出し電極の前後の電界、取り出
し電極の電子ビーム通過孔径、各々の電極間隔からの関
係式で求められる寸法以上である、或は電子ビームを制
限する制限電極の次に電子ビームが通過する電極の電子
ビーム通過孔径の水平寸法あるいは垂直寸法が、制限電
極の直前に電子ビームが通過する電極と制限電極との両
電極の電位、両電極の前後の電界、両電極の電子ビーム
通過孔径、各々の電極間隔からの関係式で求められる寸
法以上であるという構成を備えたことにより、電極の貫
通孔を電子ビームが通過する際に受ける収差や歪の影響
を避け、結果的に輝度偏りを実質上無くし、輝線や輝度
むらが極めて少ない、良好な画質を得ることができる。As described above, according to the present invention, the horizontal dimension or the vertical dimension of the electron beam passage hole diameter of the electrode through which the electron beam passes after the extraction electrode for extracting the electron beam is determined by the potential of the extraction electrode, the front and rear of the extraction electrode. Electric field, the electron beam passage hole diameter of the extraction electrode, or the dimension obtained by the relational expression from the electrode intervals, or the electron beam passage hole diameter of the electrode through which the electron beam passes next to the limiting electrode that limits the electron beam. The horizontal dimension or vertical dimension of is the electric potential of both electrodes of the electrode through which the electron beam passes immediately before the limiting electrode and the limiting electrode, the electric field before and after both electrodes, the electron beam passage hole diameter of both electrodes, and the distance from each electrode. By having a configuration in which the size is equal to or larger than the dimension required by the relational expression, the influence of aberration and distortion that the electron beam receives when passing through the through hole of the electrode is avoided, and as a result Substantially eliminating the degrees deviation, very few bright line and luminance unevenness, it is possible to obtain good image quality.

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

【図１】（ａ）本発明の第１の実施例における画像表示
装置の基本構造を示す断面図 （ｂ）本発明の第１の実施例における画像表示装置の基
本構造の部分拡大図FIG. 1A is a sectional view showing a basic structure of an image display device according to a first embodiment of the present invention. FIG. 1B is a partially enlarged view of a basic structure of an image display device according to a first embodiment of the present invention.

【図２】本発明の第１の実施例における取り出し電極の
貫通孔を示す図FIG. 2 is a diagram showing a through hole of a take-out electrode according to the first embodiment of the present invention.

【図３】本発明の第１の実施例におけるスクリーン上で
の１ビームあたりの輝度（電流密度）分布FIG. 3 is a luminance (current density) distribution per beam on the screen in the first embodiment of the present invention.

【図４】（ａ）本発明の第２の実施例における画像表示
装置の基本構造を示す断面図 （ｂ）説明のための（ａ）の一部を拡大した拡大図FIG. 4A is a cross-sectional view showing the basic structure of an image display device according to a second embodiment of the present invention. FIG. 4B is an enlarged view showing a part of FIG.

【図５】本発明の第２の実施例における信号電極の貫通
孔を示す図FIG. 5 is a diagram showing a through hole of a signal electrode according to a second embodiment of the present invention.

【図６】従来の画像表示装置の分解斜視図FIG. 6 is an exploded perspective view of a conventional image display device.

【図７】従来の画像表示装置の横断面図FIG. 7 is a cross-sectional view of a conventional image display device.

【図８】従来のスクリーン上での１ビームあたりの輝度
（電流密度）分布FIG. 8: Luminance (current density) distribution per beam on a conventional screen

【符号の説明】[Explanation of symbols]

１ 背面電極 ３ 引き出し電極 ４ 信号電極 ５ 第一集束電極 1 back electrode 3 extraction electrode 4 signal electrode 5 first focusing electrode

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 真空容器内に、電子源と、その電子源か
ら電子ビームを取り出しビームの通過量を制限する取り
出し電極と、電子ビームの制御や信号変調を行なう複数
の電極よりなる電子ビーム制御電極群と、前記電子源よ
り発せられ前記電子ビーム制御電極群により制御された
電子ビームの射突により発光するスクリーンとを備えた
平板型画像表示装置であって、前記取り出し電極の次に
電子ビームが通過する電極の電子ビーム通過孔径の水平
寸法bxあるいは垂直寸法byが、前記取り出し電極の電位
V1、前記取り出し電極の直前に電子ビームが受ける電界
E1と，前記取り出し電極の直後に電子ビームが受ける電
界E2、前記取り出し電極の電子ビーム通過孔径の水平寸
法axと垂直寸法ay、前記取り出し電極の前に電子ビーム
が通過する電極と前記取り出し電極間の距離c、前記取
り出し電極の次に電子ビームが通過する電極と前記取り
出し電極間の距離との前後の電極間隔dに対し、 【数１】 但し、 【数２】 であることを特徴とする平板型画像表示装置。1. An electron beam control including an electron source, an extraction electrode for extracting an electron beam from the electron source and limiting a passing amount of the beam, and a plurality of electrodes for controlling the electron beam and modulating a signal in a vacuum container. A flat panel image display device comprising: an electrode group; and a screen that emits light by a collision of an electron beam emitted from the electron source and controlled by the electron beam control electrode group. The horizontal dimension bx or the vertical dimension by of the electron beam passage hole diameter of the electrode through which the
V1, electric field received by the electron beam just before the extraction electrode
E1, an electric field E2 that the electron beam receives immediately after the extraction electrode, horizontal dimensions ax and vertical dimension ay of the electron beam passage hole diameter of the extraction electrode, between the electrode through which the electron beam passes before the extraction electrode and the extraction electrode With respect to the distance c, and the electrode distance d before and after the distance between the extraction electrode and the electrode through which the electron beam passes next to the extraction electrode, However, A flat panel image display device characterized in that 【請求項２】 真空容器内に、電子源と、その電子源か
ら電子ビームを取り出す取り出し電極と、ビームの通過
量を制限する、或は且つ電子ビームの制御や信号変調を
行なう制限電極と、更に電子ビームの制御を行なう複数
の電極よりなる電子ビーム制御電極群と、前記電子源よ
り発せられ前記電子ビーム制御電極群により制御された
電子ビームの射突により発光するスクリーンとを備えた
平板型画像表示装置であって、前記制限電極の次に電子
ビームが通過する電極の電子ビーム通過孔径の水平寸法
bxあるいは垂直寸法byが、前記制限電極の直前に電子ビ
ームが通過する電極の電位V1，前記制限電極の電位V2、
前記制限電極の直前に電子ビームが通過する電極の直前
に電子ビームが受ける電界E0、前記制限電極の直前に電
子ビームが通過する電極と前記制限電極との間の電界E
1、前記制限電極の直後に電子ビームが受ける電界E2、
前記制限電極の直前に電子ビームが通過する電極と前記
制限電極の電子ビーム通過孔径の水平寸法gx，axと垂直
寸法gy，ay、前記制限電極の直前に電子ビームが通過す
る電極とその直前に電子ビームが通過する電極間の距離
h、前記制限電極の直前に電子ビームが通過する電極と
前記制限電極間の距離c、前記制限電極と前記制限電極
の直後に電子ビームが通過する電極間の距離dに対し、 【数３】 但し、 【数４】 であることを特徴とする平板型画像表示装置。2. An electron source, an extraction electrode for extracting an electron beam from the electron source, and a limiting electrode for limiting the beam passage amount, or for controlling the electron beam or modulating a signal, in a vacuum container. Further, a flat plate type having an electron beam control electrode group including a plurality of electrodes for controlling the electron beam, and a screen which emits light by an electron beam emitted from the electron source and controlled by the electron beam control electrode group In the image display device, the horizontal dimension of the electron beam passage hole diameter of the electrode through which the electron beam passes next to the limiting electrode.
bx or vertical dimension by is the potential V1 of the electrode through which the electron beam passes immediately before the limiting electrode, the potential V2 of the limiting electrode,
An electric field E0 received by the electron beam immediately before the electrode through which the electron beam passes immediately before the limiting electrode, an electric field E between the electrode through which the electron beam passes immediately before the limiting electrode and the limiting electrode E
1, the electric field E2 received by the electron beam immediately after the limiting electrode,
An electrode through which the electron beam passes immediately before the limiting electrode, horizontal dimensions gx, ax and vertical dimensions gy, ay of the electron beam passage hole diameter of the limiting electrode, an electrode through which the electron beam passes immediately before the limiting electrode and immediately before that Distance between electrodes through which electron beam passes
h, the distance c between the electrode through which the electron beam passes immediately before the limiting electrode and the limiting electrode, and the distance d between the electrode through which the electron beam passes immediately after the limiting electrode and However, A flat panel image display device characterized in that