JP3220533B2 - DC type gas discharge display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat display device utilizing gas discharge, wherein a resistor for limiting discharge current is provided.
The present invention relates to a direct current type gas discharge display device which realizes improvement of luminance and uniformity of display.

[0002]

2. Description of the Related Art A gas discharge display device is used as a flat display device in an information terminal such as a portable computer, and its application field is expanded due to its clear display and wide viewing angle. In recent years, a gas discharge display device has been attracting attention as a device for greatly reducing the depth of a television set along with an increase in the size of a television set.

To meet these demands, there has conventionally been a memory-driven DC gas discharge display device with a resistor as disclosed in Japanese Patent Application Laid-Open No. Sho 60-253131.
The structure will be described with reference to FIG. In FIG. 4, a conventional memory-driven DC-type gas discharge display device includes a first electrode line 14 formed on a back glass 13 and a front glass 1.
Opposed across the partition wall 20 in the arrangement and the second electrode lines 12 formed on 1 are orthogonal to each other, a number of discharge cells 21 are formed in a matrix on the intersection. The perimeter of the combined glass plate is sealed with low melting point glass, etc.
A discharge gas mainly composed of a rare gas is sealed inside.
An electrode body 18 is provided on the back glass side, and is electrically connected to the first electrode wire 14 by a resistor 22 also provided on the back glass. The portions other than the electrode body 18 on the back glass, that is, the electrode wires 14 and the resistor 22 are covered with the insulating layer 23, and the electrode body 18 and the second electrode wire 12 constitute a pair of discharge electrodes. . Therefore, the second electrode wire 12 or the electrode body 18 serves as an anode or a cathode of the discharge electrode, and the first electrode wire 14 serves as the electrode body 18.
Functions as an anode bus or a cathode bus. The phosphor 19 is applied on the back glass side of each discharge cell 21, that is, on the insulating layer 23. On the other hand, surface glass 1
The portion other than the first second electrode line 12 is transparent, so that the surface of the phosphor 19 can be observed through the discharge cell 21. The first electrode line 14, the second electrode line 12, the electrode body 18, the resistor 22, the phosphor 19, and the partition wall 20 are formed on a glass plate using a thick film printing technique, and are manufactured at extremely low cost. can do.

[0004] In the DC type gas discharge display device constructed as described above, display discharge is simultaneously performed in a large number of discharge cells belonging to one anode bus by so-called memory drive, and practically sufficient luminance is obtained. . In the case of the memory drive, a means for equally distributing the discharge current to each cell is required. However, the resistor 22 is provided for this purpose, and stabilizes the discharge current and discharges the current flowing through each cell. It has the function of making the current uniform.

[0005]

In the above-described conventional memory-driven DC-type gas discharge display device, the resistance value varies due to variations in the thickness and shape of the resistor 22 and the position of the electrode body. As a result, some of the discharge cells have low luminance. In general, when a large number of resistors having the size of a discharge cell are formed by a thick film printing technique, the resistance value varies by ± 30% or more due to a change in the shape. The current flowing through the discharge cell reflects the variation of the resistance value almost as it is, and exhibits a variation of ± 30% or more similarly to the resistance value.
Therefore, in the conventional resistor, there is a problem in that the luminance varies from cell to cell, resulting in a display having uneven luminance.

The present invention has been made to solve such a problem, and has a high luminance, which is a feature of a memory driving system.
It is another object of the present invention to provide a DC-type gas discharge display device having no luminance unevenness.

[0007]

In order to solve this problem, the present invention forms a first group of electrode lines on a first substrate,
The first electrode line is covered with a first insulating layer having a through hole, a resistance line is formed on the first insulating layer in parallel with the first electrode line, and a plurality of electrode bodies are formed on the resistance line. Forming the electrode body and the first electrode line via the resistance line, and forming a second electrode line group on the second substrate; The first substrate and the second substrate were held by a partition formed on the first substrate or the second substrate so that the electrode body and the second electrode line faced each other. Things.

[0008]

According to this structure, the first electrode wire, the resistor, and the electrode body are formed three-dimensionally by the insulating layer to increase the width of each line, and to reduce the pattern accuracy and the processing accuracy, thereby reducing the resistance value. Variations can be suppressed and a DC-type gas discharge display device with good uniformity of luminance can be realized.

[0009]

Next, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cutaway view showing a part of a direct current type gas discharge display device of the present invention, and FIG. 2 is a sectional view (cut plane CC ′) of the panel shown in FIG.

In FIG. 1, a second electrode line 12 is formed on a front glass 11 by a thick film printing technique, and a first electrode line 14 is formed on a rear glass 13. The first electrode wire 14 is covered with a first insulating layer 15, and a resistance wire 16 is formed on the first insulating layer 15 in parallel with the first electrode wire 14. Of the insulating layer 17. In the first and second insulating layers, through-holes whose cross sections are shown in FIG. 2 are formed, and the electrode body 18 provided in the through-hole portion of the second insulating layer 17 is formed by two portions of the resistance wire 16. Is connected to the electrode wire 14. Further, a phosphor 19 is formed on the second insulating layer 17 except for a portion of the electrode body 18. The through hole of the second insulating layer, that is, the electrode body 18 is located substantially at the center of the through holes provided at equal intervals in the first insulating layer.

A partition 2 is provided between the front glass and the rear glass.
0, the first electrode line 14 and the second electrode line 12 are orthogonal to each other, and the second electrode line 12 and the electrode body 18 are combined so that the discharge cell 21 is formed. In addition to sealing with melting point glass, a gas mainly composed of xenon is sealed inside.

Next, the operation will be described. In FIG. 1, a negative scanning pulse is applied to the second electrode line 12 and the first electrode line 14
When a positive voltage is applied to the discharge cell 21 at the intersection,
, A display discharge occurs. This positive voltage is called a write pulse. By sequentially applying the write pulse to the first electrode line 14 in synchronization with the scan pulse, a display discharge occurs in the discharge cells 21 arranged on the entire display device, and an arbitrary pattern is emitted, thereby forming a display device. Function. The color display is
This is realized by using a gas mainly composed of, for example, xenon as a discharge gas and causing the phosphor to emit light by ultraviolet rays emitted by xenon. Since such a DC type gas discharge display device generally has a memory function, a display with high luminance can be obtained. The principle is as follows. Once a write pulse (voltage Vw) is applied to a certain discharge cell to start discharge, charged particles remain in the discharge cell, so that a certain period (usually several microseconds) is maintained even after the write voltage is removed. Can restart discharge at a voltage (Vm) lower than the initial write voltage. Therefore,
When a voltage of about Vm is continuously applied during this fixed period, continuous display light emission can be obtained, and the luminance is improved. According to this method, a display luminance of 100 cd / m ² or more is obtained, which satisfies a value required for a TV display device. Also,
The auxiliary anode 24 generates a discharge in advance between the auxiliary anode 24 and the cathode, thereby facilitating the discharge start of the discharge cell 21.

Next, the arrangement of the resistance wires according to the present invention will be described. In FIG. 1, in the direct current type gas discharge display device according to the present invention, by arranging the resistance wire 16 on the first electrode wire 14, compared with the case where the electrode wire and the resistance wire are arranged in a plane, Each line width can be formed to be thick, and the accuracy of the resistance value is dramatically improved. Furthermore, the resistance wire 16
Is not divided for each discharge cell, but is formed continuously in a straight line, so that the resistance wire only needs to secure the accuracy of the line width, and is not affected by the end of the resistance wire where the thickness varies most, As a result, variation in the resistance value is suppressed. According to the experiment, a gas discharge display device having a resistance value variation within ± 10% could be easily manufactured.

Further, in such a method of forming a resistance wire,
The positional accuracy of the electrode body 18 for ensuring the resistance value accuracy can also be greatly reduced. FIG. 3 shows the change in the resistance value when the electrode body 18 is displaced in the direction of the electrode wire 14 by numerical calculation. As shown in FIG. 3A, when the distance between the through-hole provided in the first insulating layer 15 and the electrode body 18 is 1 and the shift is g, the change in the resistance value due to the shift g is shown. Fig. 3 (b). According to this result, when the deviation is 0.1 (corresponding to 10%), the change in the resistance value is 1% or less, and the arrangement of the resistance wires according to the present embodiment is advantageous in reducing the variation in the resistance value. You can see that.

If the phosphor 19 is sufficiently thick, the second
The insulating layer 17 can be omitted. Further, if the surface of the resistor has a certain degree of conductivity, the electrode body 18 may be omitted.

Further, the present invention is not limited to the gas discharge display device shown in FIG. 1, but may be applied to a device in which a luminescent color of a gas discharge is directly extracted to the outside using a neon gas or a device without an auxiliary anode. Can be applied.

The method of manufacturing the resistance wire, the electrode wire, the electrode body, and the like has been described using the method of thick film printing as an example. These methods include vapor deposition and sputtering, and the patterning method includes photolithography. Lithography and etching, lift-off, sandblasting and the like may be used.

Examples of the resistance material include RuO ₂ , a nichrome alloy, tin oxide, Ta ₂ N, Cr—SiO, ITO, carbon and the like, and these can be selectively used. According to experiments, it is currently best to use RuO ₂ .

The material of the electrode body 18 is Au, Pd, A
g, Al, Ni, Cu or the like, or an alloy thereof is used.
For thick film printing, Au was the best.

Further, in this embodiment, the second electrode wire 12 formed on the surface glass 11 is used as a cathode, and the first electrode wire 14 formed on the back glass 13 is used as an anode bus. The second electrode wire 12 to be formed can be an anode, and the first electrode wire 14 formed on the back glass 13 can be a cathode bus. At this time, the electrode body 18 is formed of a boride such as Al, Ni, LaB ₆ or the like which operates as a cathode, or an oxide conductor such as La _1-x Sr _x CoO ₃ .

With the configuration as described above, the DC-type gas discharge display device of the embodiment of the present invention can easily realize the suppression of the variation in the resistance value, which has been difficult in the past.

[0022]

As described above, according to the present invention, since the electrode busbars and the resistance wires are three-dimensionally arranged with the insulating layer interposed therebetween, the processing accuracy is relaxed, and a resistor having a small variation can be formed without impairing mass productivity. It is possible to provide a high-brightness DC-type gas discharge display device having a stable memory operation that has not been put to practical use.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view of the configuration of a DC gas discharge display device according to an embodiment.

FIG. 2 is a sectional view C- of the DC type gas discharge display device of the embodiment.
Cross section of C '

FIG. 3A is a sectional view of a main part illustrating a relationship between positional accuracy and a resistance value of an electrode body 18 according to an embodiment. FIG. 3B is a characteristic diagram of a resistance value.

FIG. 4 is a partially cutaway view of a conventional DC-type gas discharge display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Surface glass (2nd board) 12 2nd electrode wire 13 Back glass (1st board) 14 1st electrode wire 15 1st insulating layer 16 Resistance wire 17 2nd insulating layer 18 Electrode body 19 Fluorescence Body 20 Partition wall 21 Discharge cell 22 Resistor 23 Insulating layer 24 Auxiliary anode

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuo Takahashi 1006 Kadoma Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Denshi Kogyo Co., Ltd. (72) Inventor Naoki Kosugi 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Electronics Corporation (72) Inventor Tetsuo Sakai 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Research Institute of Broadcasting Technology (72 ) Inventor Mizuyoshi Gozawa 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Research Institute (72) Inventor Yasushi Motoyama 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Research Institute (56) References JP-A-56-152137 (JP, A) JP-A-60-193235 (JP, A) JP-A-3-179638 (JP, A) JP-A 4-2 72635 (JP, A) JP-A-6-150833 (JP, A) JP-A-6-150834 (JP, A) JP-A-55-114954 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 17/49

Claims (7)

(57) [Claims] A first electrode line group formed on a first substrate, the first electrode line is covered with a first insulating layer having a through hole, and the first electrode line is formed on the first insulating layer; A resistance wire is formed in parallel with the first electrode wire, a plurality of electrode bodies are formed on the resistance wire, and the electrode body and the first electrode wire are connected via the resistance wire. And a second group of electrode lines formed on a second substrate so that the first substrate and the second substrate are opposed to each other with the electrode body and the second electrode line facing each other. A DC-type gas discharge display device which is held by a partition formed on the first substrate or the second substrate. 2. The direct current type gas discharge display device according to claim 1, wherein the electrode body is also used as a part of the resistance wire. 3. The resistance wire is covered with a second insulating layer having a plurality of through holes, and an electrode body is formed on the resistance wire portion exposed through the through hole of the second insulating layer. DC type gas discharge display device according to claim 1 Symbol placement. Wherein the second electrode wire is a cathode, the first of claims 1 Symbol mounting electrode body which is connected via the resistance wire to the electrode line, characterized in that an anode current type gas discharge Display device. Wherein the second electrode line is an anode, the first of claims 1 Symbol mounting electrode body which is connected via the resistance wire to the electrode line, characterized in that a cathode current type gas discharge Display device. 6. The partition of the first substrate and the DC type gas discharge display device according to claim 1 Symbol mounting, characterized in that formed on both substrates of the second substrate. 7. The direct-current gas discharge display device according to claim 1, wherein the resistance wire is formed of a material containing RuO ₂ as a main component.