JPH01294333A - Electrode composition - Google Patents

Abstract

PURPOSE:To make it possible to obtain an electrode composition of an excellent accuracy by providing an insulator and a device to absorb the difference of thermal expansion coefficient at a part of the electrode. CONSTITUTION:On a glass plate which is an insulating holder 1, one hundred glass frit members are formed in dot form by a printing, vertical scanning electrodes 2 are set on the glass plate avoiding to unify the electrode connections 3 and the glass frit members, and a pressure is applied in such a condition and baked up. In this case, the deformation of the difference of the thermal expansion coefficient is concentrated to the electrode connections 3 where the rigidity is weak, and the vertical scanning electrodes having a role of primary electrode operation can maintain the condition of a good position accuracy. In other words, it is clear that such a portion can be the means to absorb the difference of the thermal expansion coefficient. After baking up, the unnecessary parts of the electrode connections are cut off in a laser processing or simply by a cutting process machine or the like, and a necessary formation can be made up. In such a way, a high accuracy of electrode composition can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrode structure of a flat panel display device used in color television receivers, computer terminal displays, and the like.

(Prior art) As a flat cathode ray tube, which is the applicant's prior art, the second
There is a structure shown in the figure. 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, two characters, etc. are displayed, the horizontal direction (H) and vertical direction (V) are illustrated on the face plate portion.

In the figure, numeral 10 denotes a vertically long linear cathode made of a tungsten wire coated with an oxide cathode material, and a plurality of cathodes are arranged independently at equal intervals in the horizontal direction.

On the opposite side of the face plate portion 28 across the linear cathode 10, there is an insulating support 11 in close proximity to the linear cathode 10.
Vertical scanning electrodes 12 made of horizontally elongated striped metal plates that are vertically spaced at equal pitches and electrically separated are adhered and fixed on top.

Next, between the linear cathode 10 and the face plate 28, a planar first grid having an opening at a portion corresponding to the intersection of the linear cathode 10 and the vertical scanning electrode 12 is arranged in order from the linear cathode 10 side. Electrode (hereinafter abbreviated as G1 electrode) 13
．． A second grid electrode (hereinafter abbreviated as G2 electrode) 14° and a third grid electrode (hereinafter abbreviated as G3 electrode) 15 having openings similar to those of the Gl electrode 13 are arranged. The Gl and G2 electrodes 13 and 14 are for generating an electron beam from the linear cathode 10, and the 03 electron@A15 is for shielding the electric field from the subsequent electrode and the beam generating electric field.

Next, the fourth grid electrode (hereinafter abbreviated as 04 electrode) 16
are arranged, and the openings are longer in the horizontal direction than in the vertical direction. Two vertical deflection electrodes 17 and 18 having similar openings are arranged after the G4 electrode 16.

Figure 3 (A) shows the horizontal cross section of Figure 2, and Figure 3 ('B)
shows a vertical cross section. As shown in the figure, by vertically shifting the axes of the openings of the two electrodes,
Form a vertical deflection electrode. After the vertical deflection electrodes 17 and 18, a plurality of vertically long electrodes are provided between each of the linear cathodes 10 toward the face plate portion 28. FIG. 2 shows an example of a three-stage case, in which each electrode is connected to a first horizontal deflection voltage Vi (hereinafter abbreviated as DH electrode 1) 19.
．． Second horizontal deflection electrode (hereinafter abbreviated as DH electrode 2) 20.
A third horizontal deflection electrode (hereinafter abbreviated as DH electrode 3) 21 is used, and every other horizontal deflection electrode 19, 20, 21 is connected to a common bus line 22, 23, 24 in the horizontal direction. Each of these horizontal deflection electrodes 19, 20, 21 has a horizontal focusing function as well as a deflecting function. Face plate part 28
A light-emitting layer consisting of a fluorescent screen 26 and a metal back electrode 27 is formed on the inner surface. On the phosphor screen 26, phosphor stripes of field (R), green (G), and blue (B) are sequentially formed in the horizontal direction via a black guard band.

Next, the operation of the color cathode ray tube will be briefly explained. The linear cathode 10 is heated by passing a current through it, and the vertical scanning electrode 12. Gl electrode 13 has cathode 1
Apply approximately the same potential as 0. At this time, if a potential higher than the potential of the cathode IO is applied to the 02 electrode 14 so that the beam passes through each electrode aperture, G4. An electron beam is emitted from the cathode 10 toward the G2 electrodes 13,14. Here, the beam view is controlled by changing the potential of the linear cathode 10 or the G1 electrode 13.

The beam passing through the aperture of the G2 electrode 14 is transferred to the G3 electrode 15.
, G4 electrode 16. It is focused in the vertical direction by an electrostatic lens formed between vertical deflection electrodes 17 and 18, and D is focused in the horizontal direction.
The light is focused by an electrostatic lens formed between each of HI, DH2, and DH3.

On the other hand, the horizontal deflection is DH1 (19), DH2 (20)
.

Common bus 22.23 connected to D H3 (21)
．． This is done by applying a sawtooth wave, a triangular wave, etc. at a horizontal scanning frequency to 24.

Also, vertical scanning is performed as follows (fourth
(see figure). Emission of an electron beam from the linear cathode 10 can be controlled by making the space potential surrounding the cathode more positive or negative than the potential of the linear cathode 10.

That is, control can be performed by switching the potential of the vertical scanning electrode 12 to a potential that emits the beam (hereinafter abbreviated as ON) or cuts off the beam (hereinafter abbreviated as OFF).

In the case of the current television system that uses an interlaced system, in the first field, a predetermined deflection voltage is applied to the vertical deflection electrodes 17 and 18 for one field period, and the vertical scanning electrode 12A is applied for one horizontal scanning period. (Hereinafter, IH
A beam ON voltage is applied to only the vertical scanning electrodes (abbreviated as ), and a beam generation electric field is applied to the other vertical scanning electrodes. After IH has passed, the IH beam ON voltage is applied only to the vertical scanning electrode 12B as follows.
An IH beam ON voltage is sequentially applied to the vertical scanning electrodes, and when 127 at the bottom of the screen 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. Then, the beam applied to the vertical scanning electrode is turned on.
The voltage is determined in the same manner as in the first field. At this time, the amplitude of the deflection voltage applied to the vertical deflection electrodes 17 and 18 is adjusted so that the horizontal scanning line of the second field is located between the horizontal scanning line positions of the beam caused by the vertical scanning of the first field. , interlace can be performed.

Next, a signal processing method for applying a video signal to the beam modulation electrode of the flat cathode ray tube will be described with reference to FIG. In the figure, 41 is a three primary color signal,
Based on the television synchronization signal input from the synchronization signal input terminal 42, a timing pulse generator 43 generates timing pulses for driving circuit blocks to be described later. ER, E of the three primary color signals 41 of R2O, B demodulated in advance,
, E, are converted into digital signals by the A/D converter 44 according to timing pulses, and the signals between IH are stored in the first line memory 45. Once all the signals between IHs are stored, the signals are transferred to the second line memory 46, and the next signals between IHs are further stored in the first line memory 45. The signal transferred to the second line memory 46 is I
The signal is stored for a period of H, during which it is converted into the original analog signal by the D/A converter 47, and this signal is amplified and applied to the beam modulation electrode of the cathode ray tube.

Display can be performed with the configuration and operation described above. The electrodes used here are made of a thin plate of 42-6 alloy and a glass substrate on which aluminum is vapor-deposited.

(Problem to be Solved by the Invention) When a large display device is manufactured using vertical scanning electrodes with such a conventional configuration, due to the difference in thermal expansion coefficient between the striped metal plate forming the vertical scanning electrode and the insulating support, The insulating support cracks or warps.

Alternatively, there is a problem in that the metal plate warps or bends, making it impossible to form electrodes in the display device with high precision.

An object of the present invention is to solve the conventional problems and provide an extremely accurate electrode structure by having a part of the electrode with means for absorbing the difference in coefficient of thermal expansion with the insulator.

(Means for Solving the Problems) In order to solve the above conventional problems, the electrode structure of the present invention has a thermal expansion coefficient difference in a part of the electrode side of the electrode structure formed by bonding an insulator and an electrode. It forms a means for absorbing.

(Function) In the present invention, in the baking process for bonding the insulator and the electrode, a means for absorbing the difference in thermal expansion coefficient is formed in a part of the electrode side, thereby absorbing the difference in the elongation of thermal expansion. Can be made into an insulator.

It becomes possible to bond the electrodes without leaving any strain on both sides. This makes it possible to form a highly accurate electrode structure.

(Example) An embodiment of the present invention will be described with reference to the drawings.

A perspective view of essential parts of the present invention is shown in FIG. An example in which the electrode structure of the present invention is implemented in a flat panel display device for a color television having a size of 127 cm (50 inches) will be explained.

In this case, the insulating support 1 is made of glass and has dimensions of approximately 80aI x 110 (!l) and a thickness of 51m.

In addition, the vertical scanning electrode 2 is made of 42-6 alloy, and has a plate thickness of 0.2
as, the width of the striped electrode in the longitudinal direction is IIIWl. In the transverse direction, 500 striped electrodes are arranged at a pitch of 1.5 mm. In both the longitudinal and lateral directions,
They are connected to each other through an inter-electrode connection part 3. This inter-electrode connection part 3 is approximately half the plate thickness of the vertical scanning electrode 2, and is 0.1
It is formed with a plate thickness of nwa, and the thickness of the insulating support is approximately 0.
．． The configuration is such that they are spaced apart by about 1+nm. Furthermore, this inter-electrode connection portion 3 has a snake-shaped shape, and the width of the connection portion is approximately 0.2+nn+.

Such an electrode shape can be manufactured by performing half-etching or the like in a photo-etching process. On the other hand, dot-shaped glass frit portions with a thickness of about 100 .mu.I are formed by printing on the glass plate serving as the insulating support 1. On the glass plate on which this glass frit part is formed,
The vertical scanning electrode 2 is set so that the electrode connection part 3 and the glass frit part do not coincide with each other. In this state, pressurize to 450
Fire at a temperature of about ℃. At this time, the distortion due to the difference in thermal expansion coefficients will be concentrated in the electrode connection part with low rigidity, and the vertical scanning electrode part, which plays the role of the original electrode operation, can maintain a state with good positional accuracy. In other words, it can be seen that this portion serves as a means for absorbing the difference in thermal expansion coefficient.

After this firing, unnecessary parts of the electrode connection part are laser processed.
Alternatively, it can be simply cut with a cutting machine or the like to form the desired shape. Here, by cutting the electrode connection portions in the transverse direction of the vertical scanning electrode 2, a striped electrode structure in the longitudinal direction can be obtained.

(Effects of the Invention) As shown in the above-mentioned embodiments, the present invention forms an extremely precise electrode structure by providing a part of the electrode with a means for absorbing the difference in thermal expansion coefficient with the insulator. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts in an embodiment of the present invention, FIG. 2 is a perspective view of a flat panel image display device according to the prior art by the applicant, FIG. 3 is a horizontal and vertical sectional view thereof, and FIG. The figure is an explanatory diagram of vertical scanning, and FIG. 5 is a system diagram of its driving circuit. l... Insulating support, 2... Vertical scanning electrode, 3...
・Inter-electrode connection part (thermal expansion coefficient difference absorption means). Patent applicant Matsushita Electric Industrial Co., Ltd. Fig. 1 Fig. 2rIA 1 So 10 Linear cathode
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Claims (1)

[Claims] An electrode assembly formed by bonding an insulator and an electrode, characterized in that a part of the electrode has means for absorbing a difference in coefficient of thermal expansion between the electrode and the insulator.