JPH052992A - Plasma display device - Google Patents

Abstract

PURPOSE:To accomplish a plasma display device which gives stable main discharging and high brightness, high contrast characteristics. CONSTITUTION:A priming electrode 5, dielectric substance layer 6, fluorescent substance film 14 are furnished on the inner surface of a back plate 4, while a clear stripe-form anode 12, insulative diaphragm 15, and cathode 16 are provided on the inside surface of a facade plate 1. The insulative diaphragm is made in matrix form and is provided with a number of No.1 parallel line regions 15a, stretching in one direction, and a number of No.2 parallel line regions 15b extending as intersecting these parallel line regions 15a. The cathode 16 is made in the form of ladder, whose longer edges are located in two adjoining No.2 parallel line regions 15b while shorter edges positioned in the No.1 parallel line regions 15a. Thereby the current density of the cathode is enhanced, and a high brightness is obtained owing to the see-through type, and also a good contrast is presented because of viewing through ladder-form cathode. Thus a severance of cathode does not directly cause futal damage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor provided in each discharge cell in which a large number of elongated cathodes and a large number of elongated anodes are cross-arranged and dot-shaped discharge cells are set at the three-dimensional intersections. The present invention relates to a plasma display device in which a film is excited to emit light by ultraviolet rays generated in the discharge cell.

[0002]

2. Description of the Related Art A plasma display device as described above is disclosed in Japanese Patent Laid-Open No. 2-250236. One of the discharge cells has a structure as shown in FIG. 5, and a stripe-shaped anode 2 made of a transparent conductive film and a phosphor film covering the anode 2 are formed on the inner surface of the transparent front plate 1 made of glass. 3 is provided. Further, on the inner surface of the rear plate 4 forming the glass bulb together with the transparent front plate 1, a priming electrode 5 made of a conductive film and the electrode 5 are formed.
A dielectric layer 6 is provided to cover the. A large number of stripe-shaped cathodes 7 provided on the dielectric layer 6 intersect the anode 2 in a three-dimensional manner, and the left and right insulating partition walls 9 and 1 that partition the discharge cell 8 are formed.
0 and the transparent front plate 1 are provided with a light absorbing black film 11.

When the discharge operation is started, first, a trigger pulse is applied between all the anodes 2 and the priming electrodes 5 in a polarity such that the former is positive and the latter is negative. As a result, positive wall charges are generated on the exposed surface of the dielectric layer 6 in each discharge cell 8. Therefore, if a negative potential is sequentially applied to a large number of cathodes 7 in such a state and scanning is performed sequentially, A minute discharge occurs between 7 and the wall charge. Due to this minute discharge, charged particles necessary for the rise of the main discharge are generated in the discharge cell 8. Therefore, during the sequential scanning process, if a discharge voltage is applied between an anode 2 and a cathode 7 to perform the main discharge. , Its rising characteristics are good. And
Ultraviolet rays generated by this main discharge excite the phosphor film 3 to emit light.

[0004]

According to such a conventional structure, in attaching the phosphor film 3 on the anode 2, a part of the anode 2 must be exposed on the cathode 7 side, and therefore, the phosphor film 3 is required. Restricted by the area occupied by In addition, the light emission of the phosphor film is seen through the phosphor film from the side opposite to the excitation surface, and since the outside light is reflected by the front plate to a considerable extent, sufficient brightness and contrast can be obtained. There was a problem that it was difficult to obtain. Further, since the cathode 7 becomes long and narrow with the increase in size and density of the panel, it is difficult to supply a sufficient discharge current over the entire length of the cathode 7, and further, the cathode 7 is likely to be disconnected. There were challenges.

[0005]

In a plasma display device according to the present invention, a priming electrode and a dielectric layer covering the electrode are provided on an inner surface of a rear plate forming a glass bulb together with a transparent front plate. A phosphor film is attached on the dielectric layer. Also, on the inner surface of the front plate,
Since a large number of transparent stripe-shaped anodes, insulating partition films and cathodes facing the phosphor film are provided, the insulating partition films are formed in a matrix. However, this matrix-shaped insulating partition film has a large number of first parallel line regions that run in one direction and a large number of second parallel line regions that cross the parallel line region, and the cathode is in a ladder shape. It is formed. And, the pair of long side portions of this ladder-shaped cathode are
A plurality of short side portions are provided on two adjacent second parallel line regions, and a plurality of short side portions are provided on a plurality of first parallel line regions, respectively.

[0006]

In the plasma display device having such a structure, since the anode is not covered with the phosphor film, a good main discharge can be obtained, and moreover, the occupied area of the phosphor film can be set to be remarkably large. Since the light emission of the phosphor film is also viewed from the excitation surface side, the brightness can be increased. In addition, since the cathode is formed in a ladder shape and provided on the insulating partition member, its substantial cross-sectional area and surface area can be made relatively large, and not only low resistance can be achieved, but also disconnection at one or more places. However, it has the advantage that it does not lead to a fatal disability. Moreover, since the light emission on the phosphor film is viewed through the ladder-shaped cathode, the contrast is improved.

[0007]

The present invention will be described below with reference to the embodiments shown in the drawings.

As shown in FIG. 1, a rear plate 4 forming a glass bulb together with a transparent front plate 1 has a priming electrode 5 and a dielectric layer 6 covering the electrode 5 on its inner surface.
A large number of transparent striped anodes 1 are formed on the inner surface of the front plate 1.
Have two. Although such a configuration is the same as the conventional one, a large number of linear insulating partition walls 13 and a large number of phosphor films 14 are provided on the dielectric layer 6. However, a large number of linear insulating partition walls 13 are arranged in parallel in one direction, and stripe-shaped phosphor films 14 are laid between them. Then, as shown in FIG. 2, the large number of striped phosphor films 14 face the large number of striped anodes 12. A discharge gas containing xenon is enclosed in the glass bulb.

The insulating partition wall film 15 provided on the inner surface of the front plate 1 so as to partially overlap the anode 12 has a large number of first parallel line regions 15a which run to face the linear insulating partition walls 13.
And a large number of second parallel line regions 15b that cross the parallel line region 15a and are formed in a matrix. A large number of cathodes 16 are provided on the inner surface of the insulating partition film 15. However, each cathode 16 is formed in a ladder shape, and as shown in FIGS. 3 and 4, the pair of long side portions 16a and 16b are formed on two adjacent second parallel line regions 15b, and The short side portions 16c are located on the first parallel line regions 15a, respectively.

The second parallel line region 15b of the insulating partition film 15
Has a convex cross-sectional shape, and the protruding center portion is indicated by reference numeral 15c. Then, one long side portion 16a of one ladder-like cathode 16 and the other long side portion 16b of the ladder-like cathode 16 adjacent thereto are arranged side by side with the center portion 15c interposed therebetween, whereby the cathodes are insulated from each other. It is isolated. The insulating partition film 15 is obtained by screen-printing a paste-like dielectric material, and the center portion 15c is obtained by increasing the number of times of printing on that portion more than the number of times of printing on another portion. As will be described later, it is preferable that the ladder-shaped cathode 16 is formed and then filled with a dielectric substance.

The insulating partition film 15 is made of frit glass having PbO as a main material, and the arrangement pitch of the first parallel line regions 15a and the second parallel line regions 15b is 0.2 mm to 2 mm. 0.0mm, each width is 40μm-150
Each thickness (excluding the center part) is 100 μm
It can be set to 300 μm. In this case, as the screen in the screen printing, 400 mesh,
An ink groove width of 50 μm can be used. As the pasty dielectric material, it is preferable to use a material to which a black substance such as cobalt oxide is added in order to further increase the contrast. The ladder-shaped cathode 16 is also laminated and formed by repeating the screen printing described above 3 to 5 times. As the main material of the cathode 16, for example, Ni fine particles (average particle diameter of about 2 μm) are used.
The thickness of the insulating partition film 15 excluding the center portion 15c is preferably 50% or less of the thickness of the cathode 16, and when the former is 50 μm, the latter can be selected to be 60 μm to 80 μm.

After the formation of the ladder-shaped cathode 16, the insulating partition film 1 is formed.
5 forms a center portion 15c. Center part 15
c is obtained by packing an insulator between adjacent ladder-shaped cathodes 16, and the obtained center portion 15c
Is an insulating partition wall film that is homogenous with the previously formed portion and has a convex cross-sectional shape region. It should be noted that each time screen printing is completed, drying is performed at about 200 ° C., and when the laminated body of the insulating partition film 15 and the cathode 16 is completed, baking treatment is performed at about 550 ° C. The center portion 15c can be left as a completely blank portion when the first film is formed. In this case, the blank portion is filled up by screen printing after forming the cathode, and printing is overlaid on it.

According to another embodiment of the present invention, the linear insulating partition 13 is formed intermittently. In addition, the linear insulating partition 13
Without forming the back plate side, the long side portion 1 of the ladder-like cathode 16
It may be intermittently formed on the lower surface of 6c. In this case, not only the exhaust efficiency can be enhanced, but also the diffusion effect of the charged particles can be enhanced. It is also possible to attach the phosphor film 14 uniformly.

[0014]

Since the present invention is constructed as described above,
Not only a good main discharge can be obtained, but also the brightness and contrast can be enhanced, and the current density can be increased because the cathode becomes a ladder, and even if the cathode is broken, this does not lead to a fatal obstacle. There is an advantage. Also, by using multiple types of phosphors,
Not only monochrome but also multicolored light emission display is possible.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main part of a plasma display device embodying the present invention.

FIG. 2 is a side sectional view of the device.

FIG. 3 is another side sectional view of the device.

FIG. 4 is an exploded perspective view showing the relationship between an insulating partition film and a ladder cathode of the same device.

FIG. 5 is a side sectional view of a conventional plasma display device.

[Explanation of symbols]

1 Front plate 4 Back plate 5 Priming electrode 6 Dielectric layer 12 Striped anode 13 wire insulation partition 14 Phosphor film 15 Insulating partition film 15a First parallel line region 15b Second parallel line area 15c Center part 16 Ladder cathode 16a, 16b Long side part 16c Short side part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yunobu Morimoto             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electronics             Industry Co., Ltd. (72) Inventor Shinya Fujiwara             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electronics             Industry Co., Ltd.

Claims (2)

[Claims] 1. A priming electrode and a dielectric layer covering the electrode are provided on the inner surface of a rear plate forming a glass bulb together with a transparent front plate, and a phosphor film is provided on the dielectric layer while the front surface is provided. On the inner surface of the face plate, a large number of transparent stripe-shaped anodes facing the phosphor film, an insulating partition film and a large number of cathodes are provided, and the insulating partition film has a plurality of first parallel line regions running in one direction. , The cathode is formed in a matrix shape having a plurality of second parallel line regions that cross the parallel line region, and the cathode is formed in a ladder shape, and a pair of long side portions of the two second parallel lines are adjacent to each other. The plasma display device is characterized in that a plurality of short side portions are respectively located on the region and on the plurality of first parallel line regions. 2. A priming electrode and a dielectric layer covering the electrode are provided on an inner surface of a rear plate forming a glass bulb together with a transparent front plate, and a large number of lines arranged in one direction on the dielectric layer. While a phosphor film is provided between the insulating barrier ribs, a plurality of transparent striped anodes facing the phosphor film, an insulating barrier film and a number of cathodes are provided on the inner surface of the front plate. The insulating partition wall film is formed in a matrix having a plurality of first parallel line regions that run to face the linear insulating partition wall and a plurality of second parallel line regions that run to intersect the parallel line region, and the cathode is Make a ladder
A plasma display, wherein the pair of long side portions are located on two adjacent second parallel line areas and the plurality of short side portions are located on a plurality of first parallel line areas, respectively. apparatus.