JPS6372048A - Electrode plate - Google Patents

Abstract

PURPOSE:To obtain a contact highly reliable to the occurence of a discharge, by furnishing further a layer or more of an electric conductive membrane or a metallic plate at least as a foundation under the conductive membrane of the contact. CONSTITUTION:In an electrode furnishing an aluminum membrane 2 on the glass 1 of an insulating substrate, a layer of a conductive membrane, a silver paste membrane for example, is furnished further, as a foundation contacting to a contact terminal 4 of the aluminum membrane 2. As a result, even though a discharge occurs at the contact terminal 4, a good electrical contact without poor transmission can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in the contacts of electrode plates of flat image display tubes used in color televisions, terminal displays, and the like.

2. Description of the Related Art As a prior art flat plate cathode ray tube, there is a structure shown in FIG. In reality, each electrode is completely built into a vacuum envelope (glass container), but the vacuum envelope is omitted in the figure to make the internal electrodes clear.

In addition, in order to clarify the horizontal and vertical directions of the screen that displays images, characters, etc., there is a horizontal H9 on the face plate.
A vertical direction V is illustrated.

Reference numeral 10 denotes a linear cathode having a tungsten wire surface coated with an oxide cathode material, which is elongated in the {circle around (2)} direction, and a plurality of cathodes are arranged horizontally at equal intervals. Linear cathode 10
On the side opposite to the face plate part 28, there is a vertical direction on the insulating support 11 in close proximity to the linear cathode 1o:
Vertical scanning electrodes 12 are arranged in such a manner that they are electrically divided and elongated in the horizontal direction. These vertical scanning electrodes 12 are formed as independent electrodes with a width equal to the number of horizontal scanning lines in the vertical direction (approximately 480 in the case of the NTSC system) if a normal television image is to be displayed.

Next, between the linear cathode 10 and the face plate portion 28, there are arranged the linear cathode 10,
A planar electrode having an opening is divided into portions corresponding to the vertical scanning electrodes 12 between adjacent linear cathodes 10,
A first grid electrode (hereinafter referred to as G1) 13 applies a video signal to each electrode to perform beam modulation, and a second grid electrode (hereinafter referred to as G1) which has an opening similar to the G1 electrode 13 and is not divided in the horizontal direction. 14, 3rd Grid (hereinafter referred to as G3)
Place 15. The G2 electrode 14 is for generating an electron beam from the linear cathode 10, and the G3 electrode 16 is for shielding the electric field from the subsequent electrode and the beam generating electric field. Next, a fourth grid electrode (hereinafter referred to as G4) 1e is placed,
The opening is wider in the horizontal direction than in the vertical direction. Figure 4A
3 shows a horizontal section, and FIG. 3B shows a vertical section. At the rear of the G4 electrode 16, two electrodes 17 and 18 having apertures that are sufficiently wider in the horizontal direction than in the vertical direction, similar to the apertures in the G4 electrode 16, are arranged, as shown in FIG. 4B. A vertical deflection electrode is formed by vertically shifting the axes of the openings of the two electrodes. Vertical deflection electrode 17.1
8, a plurality of vertically long electrodes are provided between the linear cathodes 10 toward the face plate portion 28 side. FIG. 3 shows a case of three stages as an example, and each electrode is a first horizontal deflection electrode (hereinafter referred to as DH-1) 19,
A second horizontal deflection electrode (hereinafter referred to as DH-2) 20, a third horizontal deflection electrode (hereinafter referred to as DH-3) 21, and each horizontal deflection electrode 19 to
21 is a common bus bar 22, 23, 24 every other line in the horizontal direction
(C is connected.

The same voltage as the DC voltage applied to the metal back electrode 26 of the face plate section 28 is applied to the DH-3 electrode 21, and the same voltage as the DC voltage applied to the metal back electrode 26 of the face plate section 28 is applied to the DH-1 electrode 19 and the DH-2 electrode 2o for horizontal focusing of the beam. voltage is applied. A light emitting layer consisting of a fluorescent surface 27 and a metal back electrode 26 is formed on the inner surface of the face plate portion 28 . On the phosphor surface, when displaying in color, phosphor stripes of red, R, green, and blue B are sequentially formed in the horizontal direction via a black guard band.

Next, the operation of the color negative five-ray tube will be explained. By passing a current through the linear cathode 1o, 7'1. is heated, and a cathode 1 is placed on the G1 electrode 13 and the vertical scanning electrode 12.
The same voltage as the zero potential is applied. At this time G1, G
The beam advances from the cathode 10 toward the two electrodes 13 and 14, and the cathode 1
A voltage higher than the potential of 0 (for example, 100 to 3QQV) is applied to the G2 electrode 14. Here the beam is G1. The amount of light passing through each hole of the G2 electrode is controlled by changing the voltage of the G1 electrode 13. The beam passing through the aperture of the G2 electrode 14 is connected to the G3 electrode 1ts-hGa electrode 16-
Vertical deflection electrode 17.18 - Horizontal deflection electrode 19.20.2
1, a predetermined voltage is applied to these electrodes so that the electron beam forms a small spot on the fluorescent surface 26. Here, the beam focus in the vertical direction is G3 electrode 1
5, C141i16, vertical deflection electrodes 17 and 18. Horizontal beam focusing is performed using electrostatic lenses formed between DH-1, DH-2, and DH-3. It is done with a lens. The two electrostatic lenses are formed only in the vertical direction 2 and horizontal direction, respectively, so that the vertical and horizontal spot sizes of the beam can be adjusted individually.

Also DH-1 (18), DH-2 (20), DH-
A sawtooth wave, triangular wave, or staircase wave deflection voltage of the same voltage and synchronized with horizontal scanning is applied to the connected buses 22, 23, and 24 of 3 (21), and the electron beam is horizontally spread with a predetermined width. A luminescent image is obtained by deflecting the electron beam and scanning the fluorescent surface 26 with the electron beam.

Next, vertical scanning will be explained using FIG. 6.

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 1o, the linear cathode 10 The generation of electrons from is controlled. At this time, if the distance between the linear cathode 10 and the vertical scanning electrode 12 is small, a beam is generated from the cathode (hereinafter referred to as O
N), the voltage to control the cutoff (OFF) may be small. In the case of the current television system that uses an interlace system, a predetermined deflection voltage is applied to the vertical deflection electrodes 18 and 19 for one field in the first field, and a 12A voltage of the vertical scanning power supply 12 is applied to the vertical deflection electrodes 18 and 19. 1 horizontal scanning period (
The beam generation electric field is applied only to 1H) below, and the beam generation electric field is applied to the other vertical scanning electrodes 12B to 12Z. After 1H has elapsed, a 1H beam ON voltage is applied only to the vertical scanning electrode 12B, and then a voltage that turns on the beam only for 1H is applied to the vertical scanning electrode 12B at the bottom of the screen.
When this is completed, the vertical scanning of the first field is completed. In the next second field, the polarity of the deflection voltage applied to the vertical deflection electrodes 17 and 18 is reversed, and this is applied for one field. The signal voltage applied to the vertical scanning electrode 12 is applied in the same manner as in the first field. At this time, the amplitude of the deflection voltage applied to the vertical deflection polarization 17, 1B is adjusted so that the horizontal scanning line of the second field is between the horizontal scanning line positions of the beam caused by the vertical scanning of the first field. . As described above, the vertical scanning electrode 12 has the first. The same vertical scanning signal voltage is applied to the second field, and by changing the deflection voltage applied to the vertical deflection electrodes 17 and 18 between the first field and the second field, one frame of vertical scanning is completed.

Next, we will explain the generally well-known method of signal processing until the video signal is applied to the beam modulation electrode of a cathode ray tube that has multiple beam generation sources in the horizontal direction, such as the flat cathode ray tube mentioned above. This will be explained using FIG.

Timing pulse generator 4 based on TV synchronization signal 42
4, a timing pulse is generated to drive a circuit block to be described later. First, the three primary color signals of R, G, and B (ER, EG,
EB) 41 is converted into a digital signal by the A/D converter 43, and the 1H signal is sent to the first line memory circuit 4.
Enter 5.

When all the signals for 1H are input, the signals are simultaneously transferred to the second line memory circuit 46, and the next 1H signal is also input to the first line memory circuit 45.

The signal transferred to the second line memory circuit 46 is 1H
During this period, the signal is stored in memory and sent to the D/A converter (or Hahals width converter) 47, where it is converted to the original analog signal (or pulse width modulation signal), which is amplified and transmitted to the cathode ray tube. is applied to the modulated electric current G1. Such a line memory circuit is used for time axis conversion.

An example of the above DB-1, DH-2, and DH-3 electrodes is
Shown in Figure A. 19 is a DH-1 electrode, 20 is a DH-2 electrode, 21 is a DH-3 electrode, and 48 is a contact terminal.

The DH-1 (19) and DH-3 electrodes 21 are provided by depositing a conductive film, in this case aluminum, on an insulator such as a glass plate, and the DH-2 electrode 20 is provided by depositing aluminum on an insulator, for example, a glass plate. The glass plate is frit-bonded with glass fibers 49 interposed therebetween. 500 ■ for DH-1, 2, 3 electric kettles 19, 20, and 21, respectively.

Voltages of 6", 10" and a horizontal deflection voltage are applied through contact terminals 48. Contact terminals 48 are made of spring material, for example 5US631, and are plated with silver to reduce contact resistance.

Problems to be Solved by the Invention As mentioned above, DH-1, 2, 3 electrodes 19.20°21
Since a relatively high voltage is applied to the contact terminal 48, a discharge occurs at the contact portion of the contact terminal 48 during the chirping operation. Generally, to prevent this, after completing the display tube, apply a voltage approximately twice the rated value to the DH-1, 2, 3 electrodes i9, 2o, and 21j.
Conditioning is performed by intentionally generating electrical discharge.

FIG. 7B shows a cross-sectional view of the contact portion of the contact terminal 48. 48 is a contact terminal, 50 is a glass plate, and 51 is an aluminum film. Contact terminal 4 as above
Since a discharge occurs between the aluminum film 8 and the aluminum film 51, the aluminum film 51 is torn.

A depletion portion 51A is generated, and the resistance of the contact portion of the contact terminal 48 increases, making it impossible to apply a signal.

Further, in the case of a film made by firing a conductive paste instead of the aluminum film 51, no discharge occurs at the contact portion with the contact terminal 48, but the DH-1, 2°3 electrode 19, 20
, 21.

Means for Solving the Problems A conductive film is provided on the insulating material, at least at the location where contact is required, by providing one or more layers of the same or other electrical shock film.

Effects The present invention has the above-described structure, so that even if the conventional first layer film is torn by electric discharge, the second layer and the contact terminal maintain contact, and the second layer maintains contact with the first layer. ,
The contact terminal and electrode will maintain welding in good condition.

Examples Below, the image display tube in the examples of the present invention will be described.
This will be explained with reference to the figures. Figure 1 shows DH-1, 2, 3
FIG. 3 is a cross-sectional view of a contact portion of an electrode. In Figure 1, 1
2 is a glass substrate, 2 is an aluminum film, 3 is a silver paste film, and 4 is a contact terminal. In this example, before providing the aluminum film 2 on the glass substrate 1, a silver paste 3 was provided on the portion in contact with the contact terminals 4.

Silver paste 3 is heated to 530°C after being applied to glass substrate 1.
""c was established. After that, an aluminum film 2 was deposited.

The operation of the electrodes of the flat panel image display tube constructed as described above will be explained. When a voltage is applied to the contact terminal 4, a discharge occurs at the contact portion with the aluminum film 2, and even if the aluminum film 2 is torn, the contact terminal 4 will be pressed against the silver-based film 3 due to the spring force. The discharge stops. Further, since the silver paste film 3 is in contact with the aluminum film over a wide area, sufficient contact can be obtained between the contact terminal 4 and the aluminum film. As described above, according to this embodiment, in an electrode in which a conductive film, in this case an aluminum film 2, is provided on an insulating substrate and a glass 1, a further conductive film is added to the base of the aluminum film 2 in contact with the contact terminal 4. By providing the silver paste film 3, even if discharge occurs at the contact terminal 4, a good electrical connection without poor continuity can be achieved.

Further, the second example is shown as the second factor. 1 an i4 glass substrate, 2 an aluminum film, and 4 a contact terminal, which are the same as those in the first embodiment. The difference from the first embodiment is that the metal plate 5 is bonded to the glass substrate 1 with a frit 6. The metal plate 5 is made of 42-6 alloy to match the coefficient of thermal expansion with the glass substrate 1, and here has a thickness of 100 μm and has been subjected to electrolytic polishing. The above configuration also has the same effects as the first embodiment.

Effects of the Invention As described above, in the case where a contact is provided with an electrode provided with a conductive film on a substrate made of an insulator, at least one layer of conductive film or metal is added to the base of the conductive film at least in the contact portion. By providing the plate, a highly reliable contact can be obtained against the occurrence of discharge.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the contact portion of the horizontal deflection electrode of the image display tube in the first embodiment of the present invention, and FIG. 2 is a sectional view of the contact portion of the horizontal deflection electrode of the image display tube in the second embodiment. , Figure 3 is a structural diagram of a flat-plate image display tube, Figure 4 is a horizontal sectional view of Figure 3, Figure 4B is a vertical sectional view of Figure 3, and Figure 5 is the same diagram. Figure 6B is a waveform diagram of the applied voltage for manual scanning, Figure 6 is a signal processing system diagram, Figure 7 is a perspective view of the horizontal deflection electrode, and Figure 7B is a conventional FIG. 3 is a cross-sectional view of a contact portion of a horizontal deflection electrode. 1... Glass substrate, 2... Aluminum film, 3... Silver paste film, 4, 48...
・Contact terminal, 5...Metal plate. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 1 Force glass 11 and Figure 2 1 Glass substrate is flooded\ N

Claims (1)

[Claims] An electrode plate comprising a conductive film provided on an insulating substrate, characterized in that the conductive film or metal plate is provided in two or more layers at least in the contact portion with a contact terminal.