JPS60189849A - Plate-type cathode-ray tube - Google Patents

Abstract

PURPOSE:To simplify the structure of plates for vertically deflecting electron beams and reduce the electric power consumption by installing a given number of planar electrodes between a phosphor and a deflecting electrode placed parallel to the phosphor to synthesize a picture on the screen. CONSTITUTION:A thin long electron gun is horizontally installed along the direction in which the picture screen is vertically deflected. The electron gun produces horizontally divided electron beams 18 to each of which modulation is applied. It also has an auxiliary deflecting electrode 17 for vertically deflecting the electron beams 18 over the screen. Several planar electrodes having openings corresponding to the electron beams 18 are installed between a phosphor 9 placed inside an encircling case 8 and a deflecting electrode 11 placed parallel to the phosphor 9 to horizontally focus and deflect the beams 18 thereby synthesizing a picture on the screen. As a result, the beams 18 can be vertically deflected by a set of deflecting plates, thereby simplifying the structure of the vertically deflecting plates and reducing the electric power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat cathode ray tube used in color television receivers, terminal displays of calculators, and the like.

Conventional structure and its problems Conventionally, as a flat cathode ray tube, a structure as shown in FIG. 1 has been described in Japanese Patent Application Laid-Open No. 46-2619.

That is, a fluorescent surface 2 is formed on the inner surface of the vacuum envelope 1,
In addition, vertical deflection electrodes 3 are disposed parallel to each other and are elongated in the horizontal direction, and vertically divided by a predetermined pinch. It consists of a structure in which electron guns are arranged for each of the electron beams and the whole beam, each of which is divided into individual beams in the horizontal direction. The operation method of a flat plate cathode ray tube having these structures is that thermionic electrons generated by the complete heating of the electron source 4 are extracted as an electron beam through an opening provided in a grid electrode 5, and then the electron beam is extracted by the grid electrode 6. Performs beam modulation. The modulation method is performed by electrically dividing the individual apertures and applying individual beam modulation voltages to each electrode. Next, each modulated electron beam passes through the aperture of the shield electrode 7, and then passes between the fluorescent surface 2 and the vertical deflection electrode 3 provided opposite the fluorescent surface 2, for example. 2 and the vertical deflection plate are at the same potential (VD)
Go straight ahead at the point, and then move to a potential lower than VD (VD
-vcc) is applied to the vertical deflection electrode, the electron beam is deflected toward the phosphor surface 2 under the influence of the electric field, causing the phosphor to emit light. By performing these deflection operations on each of the vertical deflection electrodes, vertical scanning of the multiton beam can be performed, and a normal television image can be projected on the fluorescent surface 2.

However, in these flat cathode ray tubes, the fluorescent surface 2
The vertical deflection plate provided opposite to the vertical deflection electrode 3 must be finely divided into at least the number of vertical scanning lines, for example 260, and each of the finely divided vertical deflection electrodes 3 should be irradiated with an electron beam. It is necessary to apply a switching voltage sufficient to cause deflection to the surface 2 side, and the power required for this is also a big problem in terms of the circuit. In this method, the only means for focusing each electron beam in the horizontal direction is in the electron gun section at the bottom of the fluorescent surface 2, and it is easy to maintain the optimum focusing state of the electron beam across the entire screen. isn't it.

Purpose of the Invention The present invention solves the problems in the flat cathode ray tube described above. It simplifies the structure of the vertical deflection plate for electron beams, reduces power consumption accordingly, and This aims to make the spot shape of the electron beam uniform and to improve the spot shape in the horizontal direction.

Structure of the Invention The present invention is characterized in that a phosphor serving as a light-emitting layer is provided on the face portion of a glass container that is evacuated, and a planar electrode is placed on the outermost side in parallel with and facing the phosphor portion. In the space between them, a plurality of planar electrodes in which vertically elongated openings are provided at a predetermined pitch in the horizontal direction, and a horizontal deflection electrode for deflecting the electron beam in the horizontal direction are arranged. In the lower part of the fluorescent surface outside the effective screen, there are an electron beam generating section, a modulating section, and DESCRIPTION OF EMBODIMENTS OF THE INVENTION The present invention will be described below using embodiments including an electron gun section consisting of an electron beam deflection section.

FIG. 2 is a block diagram of a flat cathode ray tube showing a first embodiment of the present invention. Typically, a cathode ray tube uses an envelope such as a glass container to create a vacuum inside, and an electron beam causes the phosphor to emit light, producing an image on the face.

It is possible to display characters, etc. In FIG. 2, the explanation will be given with a part of the glass container having a pointed L-encircle omitted.

First, a fluorescent surface 9 made of a phosphor and a metal back layer is formed as a light emitting layer on the inner surface of the glass face portion 8 serving as an envelope, and is spaced parallel to the fluorescent surface 9 at a predetermined interval. Similarly, a vertical deflection electrode 1 is placed on the vacuum inner surface of the glass container 10.
1 will be provided.

This vertical deflection electrode 11 is made by forming a metal film or a transparent conductive film on the glass container 10 by vacuum evaporation, sputtering, or the like. As another method, a metal plate or an insulating plate made of glass or the like on which an electrode such as a metal film is formed may be separately installed inside the glass container 10. Next, an electron gun with a length corresponding to the horizontal direction of the screen is installed at the bottom of one screen facing the vertical scanning direction of the fluorescent surface. This electron gun includes a back electrode 12, a linear hot cathode 13, a first grid electrode 14,
It consists of a modulation electrode 15, a second grid electrode 16, and a vertical preliminary deflection electrode 17. The back electrode 12 is a single electrode,
The zero-order linear hot cathode 13 may be an insulating substrate on which an electrode such as a metal plate, metal film, or transparent conductive film is formed.
An oxide cathode is coated on the surface of a tungsten wire with a diameter of about 10 to 50 microns. First grid electrode 14
is a metal plate provided with openings (for example, circular, square, or rectangular) through which electron beams pass at a predetermined pitch in the horizontal direction. The modulation electrode 16 is composed of individual independent electrodes corresponding to the openings of the first grid electrode 14, and each divided electrode is provided with an electron beam passage hole in the same manner as the first grid electrode 14. There is. Next, the second grid electrode 16 has a similar shape to the first grid electrode 14. Vertical pre-deflection type (17 is composed of electrodes made of two electrically separated horizontally long metal plates facing each other with an opening that is an electron beam passage hole provided in each electrode. be done.

Next, the operation of the electron gun section composed of these electrodes will be explained. The linear hot cathode 13 is 600~SOO
The uniform thermionic electrons generated by heating to °C are
Due to the negative potential applied to the back electrode 12, the electron beam travels toward the first grid electrode 1.4 as a band-shaped electron beam. Next, the band-shaped electron beam is transmitted to the first grid electrode 14.
The apertures provided in the electron beams separate the electron beams into individual beams in the horizontal direction. The number of divisions is a matter of design. For example, when forming an image on a 5-inch screen, that is, 76 x 100 gourds, if one electron beam is generated every 10 tnm and a TV image is projected, approximately 10 electron beams are required in the horizontal direction. The ravine;
Create a child beam. These electron beams then pass through the apertures in the modulation electrode 15.

The modulation electrode 16 is electrically divided in correspondence with each electron beam, and a signal voltage for modulating (for example, turning ON or OFF) the electron beam is applied to each of the electrodes. Next, the individually modulated electron beams pass through the apertures provided in the second grid electrode 16 inserted for the purpose of electrical shielding, and then through the apertures provided in the vertical predeflection electrode 17. By applying a deflection voltage to the deflection electrode, as shown in FIG. With respect to the gap formed by the electrode 19,
Electron beam 18 (actually cannot be seen with the naked eye)
As a result, the electron beam 18 is The electron beam 18 is bent in the direction of the third planar chamber (distance 19) by changing the deflection voltage applied to the preliminary deflection electrode 17 so that the electron beam incident angle θ changes continuously. can move continuously in the vertical direction on the third planar electrode 19 to perform so-called vertical scanning.Here, returning to FIG. 2, the direction of the third planar electrode 19 can be The electron beam 18 bent and deflected is elongated in the vertical direction provided in the third planar electrode 19, and is provided at the same pitch as the openings of each electrode of the electron gun installed at the bottom of the screen. Facing the fluorescent surface 9, electrodes similar to the third planar electrode 19 are kept at a predetermined distance from the fourth planar electrode 20 and the sixth planar electrode 21, respectively. When the electron beam passes through these apertures, an optimal voltage is applied to each electrode so that the minimum beam spot (horizontal direction) is finally formed on the fluorescent surface 9. .

Next, the electron beam 18 that has passed through the aperture of the fifth planar electrode 21 is deflected by a horizontal deflection electrode 23 that is elongated in the vertical direction corresponding to the aperture of the planar electrode 21. Horizontal deflection is performed so that there is one screen on screen 9.

Here, the structure of the horizontal deflection electrode 23 will be explained. The deflection electrode is made of an insulating support 22 (for example, glass).

A metal film 23 (for example, a silver film formed by plating) is electrically isolated from both sides in the thickness direction of a ceramic (ceramic, etc.).

As shown in FIG. 4, the metal films on the same surface of the insulating support 22 are electrically connected to each other to form two sets of electrodes. By applying, for example, a sawtooth wave deflection voltage to the wirings 221 and 222, the electron beams that have passed through each opening can be deflected all at once in the horizontal direction.

In this way, individual divisions and modulations are applied in the horizontal direction by the horizontally elongated electron gun provided at the bottom of the screen, and the vertical preliminary deflection electrode 17 and a single plate placed parallel to the fluorescent surface 9 are The electron beam is scanned in the vertical direction by the deflection electrode 11 and the planar electrode 19 which is ttl+ long in the vertical direction and has apertures with the same pitch as the horizontally divided electron beam. , multiple planar types wi
Horizontal focusing is performed by 20, 21, and furthermore,
The individual electron beams are horizontally deflected by the horizontal deflection electrode 23 and are combined into one screen on the phosphor.

Next, a second embodiment will be explained using FIG. 5. Figure 5, like Figure 4, is a vertical cross-section of Figure 2. Horizontal division, modulation, and vertical scanning were performed by a horizontally elongated electron gun installed at the bottom of the screen. After each electron beam 18 passes through each aperture of the third planar electrode 19, the electron beam is deflected by a horizontal deflection electrode 24 provided at a predetermined distance from the third planar electrode 19. horizontal deflection. This horizontal deflection type'w
Reference numeral 124 denotes an electrode made of metal that is electrically isolated from each other and faces each opening, and is composed of two sets of wiring parts 241 and 242 that electrically connect the common electrodes of each opening. . Next, each horizontally deflected electron beam passes through the opening of the fifth planar electrode 26 (inserted for the purpose of electrical shielding) and is then formed on the phosphor. The metal back layer to which a high voltage is applied and the high voltage electric field applied to the metal film 23 formed on the insulating support 22 accelerate the latter stage, causing a predetermined position of the phosphor 9 to continuously emit light. . The feature of this method is that the horizontal deflection electrode can be placed in a region where the electron beam has a relatively low speed, which increases the horizontal deflection sensitivity, which simplifies the circuit configuration and reduces power consumption. This is something that is aimed at.

Here, in FIG. 6, the horizontal deflection electrode 24 may be used as a beam alignment electrode for each electron beam, and the horizontal deflection may be performed by the electrode 23 in the same manner as in the first embodiment. It is better if the two-divided electrode 24 is individually wired to perform beam alignment in the horizontal direction for each electron beam. According to this method, the size of the electron beam coming from the distance between the electrodes is 7h 4'+'j 16
For example, in order to generate an index signal in the nine layers of electron beams (in a structure in which a phosphor for indexing is provided, the position of the electron beam and the electron beam can be determined from that signal). By feeding back to this beam alignment electrode, the positional accuracy associated with the deflection of the electron beam can be improved.

Next, a third embodiment will be explained using FIG. 6. FIG. 6 is a vertical cross-sectional view of FIG. 2, similar to FIG. A 1q horizontally thin electron gun provided at the bottom of the screen, each planar electrode 19, 20, 21 installed between the phosphor 9 and the vertical deflection electrode 11, and an aperture through which the electron beam passes. The parts must be mechanically aligned. Therefore, as shown in FIG. 6, for each electron beam 18 generated from an electron gun provided at the bottom of the screen, a horizontal position correction electrode 2 having a shape similar to the horizontal deflection electrode explained in FIG.
7 is arranged between the vertical deflection electrode 11 and the third planar electrode 19 so as to face each electron beam 18, and these electrodes 27 are arranged for each electron beam 18 individually or as shown in the figure. As shown, the electrodes facing each other across the electron beams 1 and 8 are electrically divided into common wiring lines 271 and 272.
271 and 272, and an electrical signal for correcting the horizontal position of the electron beam is applied to these 271 and 272. By this method, the individual electron beams 18 that have exited the electron gun can be made to enter the individual apertures provided in the third planar electrode 19 with high accuracy. The electron beam that has passed through the aperture of the third planar electrode 19 is focused and horizontally deflected by the electrodes 20 and 21 in the same manner as in the first and second embodiments. 9 to emit light.

In addition, in Fig. 2, we have explained an example in which a linear hot cathode is used as the cathode for a horizontally elongated electron gun installed at the bottom of the screen, but there is no need to limit it to this. The same effect can be obtained even if the required number of point cathodes are used in parallel. At that time, the back electrode 12 is also unnecessary, and the arrangement of the grid electrodes 14, 15, and 16 is slightly changed. Further, the number of planar electrodes 19, 20, 21 arranged between the phosphor 9 and the vertical deflection electrode 11 is not limited to the configuration of the embodiment, and may vary depending on the purpose of use of each electrode. There is no need to say that it is good even if there is an increase or decrease in the amount. ! f. In the first embodiment, the explanation was given by arranging one set of horizontal deflection electrodes for one aperture of a planar electrode, but for a plurality of apertures of a planar electrode, A set of horizontal deflection electrodes is arranged to deflect, for example, three electron beams at the same time, and a shadow mask is inserted between the horizontal deflection electrode and the phosphor to produce red light.

It may be used as a color display tube in which blue and green phosphors are emitted by their respective electron beams.Effects of the Invention The present invention provides a flat cathode ray tube in which the screen is horizontally extended in the vertical direction of deflection. An elongated electron gun is arranged in the horizontal direction, and this electron gun creates an electron beam that is divided horizontally and is individually modulated, and also performs preliminary deflection for vertically deflecting the electron beam on the screen. The basic structure has a deflection electrode of A plurality of planar electrodes are arranged to perform horizontal focusing and horizontal deflection of the electron beam, and combine the images into a single image on the screen. , 1. By using a single silk deflector plate, the circuit structure can be simplified and power consumption can be reduced. In addition, for each electron beam, the planar electrode is placed in alignment with the phosphor, which improves the uniformity of the beam spot over the entire screen and improves the accuracy of the beam position in the horizontal direction. death,
When colorizing the tube, problems such as color misalignment with the phosphor are eliminated, and the performance of the cathode ray tube is improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a conventional flat cathode ray tube, and FIGS. 2 to 4 are perspective views showing the structure of a flat cathode ray tube for explaining the first embodiment of the present invention. , a partial vertical cross-sectional view and a cross-sectional view, FIG. 6 is a partial cross-sectional view of a flat cathode ray tube for explaining the second embodiment of the present invention, and FIG. FIG. 2 is a partial cross-sectional view of a flat cathode ray tube for explaining an embodiment of the present invention. 8... Envelope, 9... Fluorescent material, 1o.
... Envelope, 11 ... Vertical deflection electrode, 1
2... Back electrode, 13... Line hot cathode, 14... First grid electrode, 16...
...Modulation electrode, 16...Second grid electrode, 1
7... Vertical preliminary deflection electrode, 18... Electron beam, 19... Third planar electrode, 2o...
...Fourth planar electrode, 21...Fifth planar electrode,
23...Horizontal deflection electrode. Name of agent: Patent attorney Toshio Nakao and one other person Published in Japanese Patent Application Publication No. 1898-18984! l(6)

Claims (1)

[Claims] (1) An elongated electron gun is arranged horizontally in the vertical scanning extension direction of the screen having a phosphor, and this electron gun is used for at least the generation part of the electron beam, the division in the horizontal direction, and the individual electron beams. It consists of a modulation section for performing modulation, a vertical pre-deflection electrode for vertical scanning of the electron beam on the screen, and a phosphor for directing each electron beam from the electron gun at a position parallel to the phosphor. One sheet of planar deflection lightning 7 poles for directing the electron beam, and a plurality of vertically elongated openings corresponding to the individual electron beams in the space between the planar deflection electrode and the phosphor. A planar electrode and horizontal deflection electrodes corresponding to individual electron beams are arranged, and these electrodes focus and range the individual electron beams in the horizontal direction, and display them as a single image on a fluorescent surface. A flat cathode ray tube featuring: (→ Claim 1, which comprises a position correction electrode for correcting the position in the horizontal direction corresponding to each electron beam, is provided between the deflection electrode and the plurality of planar electrodes. A flat cathode ray tube according to claim 1, further comprising separate horizontal position correction electrodes for each electron beam before the four horizontal deflection electrodes.