JPH0724771Y2 - Gas discharge display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a gas discharge display panel having a cathode provided with an emitter layer and a barrier rib, and in particular, by devising the structure of the barrier rib and the emitter layer. The present invention relates to a gas discharge display panel having excellent life characteristics and discharge stability, capable of obtaining a sharp display, and having a low driving voltage and high brightness.

[Prior Art] Conventionally, in a gas discharge display panel of that kind, a plurality of strip-shaped or linear cathodes are formed in parallel on a rear substrate made of an insulating material such as flat glass, A barrier rib for separation is provided in the same manner, an anode is similarly formed on the front substrate, and the rear substrate and the front substrate are arranged so as to face each other so that the cathode and the anode intersect each other with a discharge gap. The peripheral portion of the substrate is sealed to form an airtight envelope. Further, a discharge gas is sealed in the airtight envelope, and a discharge cell is formed at a portion where the cathode and the anode face each other.

Then, a voltage is selectively applied to each of the cathode and the anode, and the discharge cells formed by the selected electrodes are discharged to display characters, symbols, patterns and the like.

When manufacturing the gas discharge display panel, Fe, Ni,
A metal foil made of Cr or an alloy of these is etched to form a cathode, an emitter material is plasma-sprayed on the surface of the cathode to form an emitter layer, and the emitter layer is dropped between barrier ribs formed on the rear substrate. Or, on the back substrate, printing a metal paste such as Ni, Ag, Pd, etc., and further printing the emitter material on the surface, printing a low melting point glass between the metal paste, and firing it, A cathode, an emitter layer and a barrier rib are formed.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional gas discharge display panel, although the cathodes arranged in parallel are separated by the barrier ribs provided between them, There is no partition part in the extending direction of the cathode. Therefore, there is a possibility that the cathode area in the discharge cell becomes unspecified and the discharge becomes unstable. In addition, the boundaries between the adjacent discharge cells are not clear, so that a sharp outline cannot be displayed, and the adjacent non-selected cells may be abnormally lit due to erroneous discharge.

Further, when the cathode is operated as a hollow cathode, the discharge sustaining voltage becomes low and the light emission amount of the negative glow increases, so that a gas discharge display panel of high luminance display with a low driving voltage can be obtained. Since the above-mentioned conventional emitter layer has a flat structure, it cannot operate as a hollow cathode, and the driving voltage is higher and the display brightness is lower than in the case of the hollow cathode.

The present invention has been devised in view of the above-mentioned points, and solves the above-mentioned problems all at once, is excellent in discharge stability, can obtain a high-quality display with a sharp contour, and has an abnormal non-selected cell. An object of the present invention is to realize a gas discharge display panel which has a low driving voltage and a high display brightness without the risk of lighting.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the gas discharge display panel of the present invention includes a plurality of cathodes formed on a rear substrate and a plurality of anodes formed on a front substrate. In a gas discharge display panel in which discharge cells are formed at the intersecting portions so as to be opposed to each other, and a partition-like first barrier rib is provided on the back substrate so as to surround the cathode of the discharge cells. To form a hollow cathode by covering the surface of the cathode and the side surface of the first barrier rib with an emitter layer.
A partition-shaped second barrier rib is formed on the upper surface of the barrier rib.

[Operation] Since the present invention is configured as described above, the partition-shaped barrier ribs make the cathode areas of the respective discharge cells substantially uniform and stabilize the discharge characteristics. Moreover, since the individual discharge cells are clearly separated, high-quality display with a sharp outline can be obtained without light emission leaking to the adjacent discharge cells, and abnormal lighting of the adjacent non-selected discharge cells is prevented. You can

Then, by forming a hollow cathode by covering the entire circumference of the side surface of the first barrier rib of each discharge cell to form a hollow cathode, the negative glows on all sides are combined, and a gas discharge display panel with a low driving voltage and high brightness can be obtained. .

Further, by forming a second barrier rib having the same partition shape on the upper surface of the first barrier rib having the partition layer to which the emitter layer is applied, the creeping distance between the adjacent cathodes is increased, and the sputter substance is attached. Insulation deterioration between the cathodes can be reduced.

Further, by providing the groove on the upper surface of the second barrier rib, the creepage distance is further increased, and the insulation deterioration between the cathodes is further reduced.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 (A) is a cutaway exploded perspective view of the present invention, and FIG. 1 (B).
Is a perspective view of the front substrate of the present invention, and FIG. 2 is a cross-sectional view showing a manufacturing process of the present invention.

In the figure, 1 is a gas discharge display panel of the present invention.
Reference numeral 2 is a back substrate made of an insulating material such as flat glass having a thickness of several millimeters, and Ag / Pd-based metal paste is printed on the upper surface in a strip shape with a thickness of 20 to 30 μm and 400 to 500 The cathode 3 is formed by firing at a temperature of about ° C.

4 is a lead-borosilicate glass-based low-melting-point glass paste on the upper surface of the rear substrate 2 on which the cathode 3 is formed in a grid pattern of 350 to 400.
This is the first barrier rib printed with a thickness of μm and baked at a temperature of about 400 to 500 ° C. The lattice-shaped first barrier ribs 4 are formed so as to surround a cathode 3 in a discharge cell 5 described later, and are set to have an appropriate size according to the purpose of use of the gas discharge display panel 1. .

As shown in FIG. 2 (B), 6 is lanthanum hexaboride (LaB ₆₎ plasma-sprayed to a thickness of 100 to 150 μm on the surfaces of the cathode 3 and the first barrier rib 4 in a state of being melted by a plasma jet. ) Is the main emitter material. The melting point of this lanthanum hexaboride (LaB ₆ ) is as high as about 2600 ° C., but when the lanthanum hexaboride (LaB ₆ ) is completely melted by the high temperature of several thousand to several tens of thousands of degrees in the plasma jet, The emitter material 6 sprayed on the cathode 3 and the first barrier rib 4 is strongly sintered.

Then, as shown in FIG. 2 (C), the first barrier rib 4
The emitter material 6 attached to the upper surface of is removed by cutting or polishing, and the emitter material 6 is insulated and separated for each discharge cell 5 to form the emitter layer 7 corresponding to each discharge cell 5. The emitter layer 7 is formed so as to cover the surface of the cathode 3 and the side surface of the first barrier rib 4 in a grid shape, and forms a recess 8 above the cathode 3 in the discharge cell 5. And
By setting the depth of the recess 8 to be 150 μm or more, the emitter layer 7 operates as a hollow cathode.

As a method for insulating the emitter material 6 from each discharge cell 5, the first barrier rib 4 is not particularly shown.
Is coated with a resist layer made of a rubber-based or silicon-based material in advance, plasma-sprayed an emitter material 6 on the cathode 3, the first barrier rib 4 and the resist layer surface, and then the resist layer is removed. A method of isolating and separating the emitter material 6 may be used.

Further, the emitter material 6 has features such as a low work function, less wear due to ion collision, and a high melting point, and the rare earth element hexaborate including lanthanum hexaboride (LaB ₆ ) described above is used. Compounds (YB ₆ , LaB ₆ , CeB ₆ , GdB _6, etc.),
Rare earth element tetraborides (YB ₄ , GdB ₄ ), rare earth element oxides (Y ₂ O ₃ , La ₂ O ₃ , CeO ₂ , Gd ₂ O _3, etc.), alkaline earth metal element oxides (MgO) , SrO, etc.), a complex compound of an oxide of an alkaline earth metal element and a molybdate of the element, a complex compound of an oxide of an alkaline earth metal element and a tungstate of the element, an alkaline earth metal element Complex compound of oxides of aluminium and aluminate of the element (aMgO.bAl ₂ O ₃ , aBa
O.bSrO.cAl ₂ O ₃ etc.) can be preferably used.

Then, as shown in FIG. 2 (D), a low melting point glass paste of lead borosilicate glass is formed on the upper surface of the first barrier rib 4 from which the emitter material 6 has been removed, in a grid pattern having substantially the same intervals as the first barrier rib 4. And the second barrier rib 9 is formed by baking at a temperature of about 400 to 500 ° C. The upper surface of the second barrier rib 9 is a surface having many fine irregularities, unlike the smooth upper surface of the first barrier rib 4 which is cut or polished. This also contributes to the increase of the creepage distance between the adjacent cathodes.

Reference numeral 10 is a front substrate made of an insulating material such as flat glass. On the surface of the front substrate 10 facing the rear substrate 2, transparent electrodes such as tin oxide and indium oxide are applied in parallel in strips to form an anode. Forming 11

A lead borosilicate glass-based low-melting-point glass paste is provided on the surface of the front substrate 10 facing the back substrate 2 and the surface of the anode 11 at an interval substantially equal to that of the second barrier rib 9 on the back substrate 2. It is a barrier rib printed and fired in a grid pattern.

The rear substrate 2 and the front substrate 10 are arranged so that the cathode 3 and the anode 11 intersect each other with a discharge gap and the tops of the second barrier rib 9 and the barrier rib 12 overlap each other. A discharge cell 5 is formed at the intersection of 3 and the anode 11. Further, the peripheral portions of the back substrate 2 and the front substrate 10 are sealed with a low melting point glass to form an airtight container 13, and a discharge gas containing a rare gas as a main component is sealed therein, so that a gas discharge display panel can be obtained. 1 is formed.

In another embodiment of the present invention shown in FIG. 3, two borosilicate glass-based low melting point glass pastes are arranged in parallel on the upper surface of the first barrier rib 4 from which the emitter material 6 has been removed. The ribs are printed in a grid pattern, grooves 14 are provided between these two ribs, and the ribs are baked at a temperature of 400 to 500 ° C.
The barrier ribs 9 are formed. The other structure is similar to that of the above-described embodiment.

[Effects of the Invention] As described in detail above, according to the present invention, the cathodes of the discharge cells are surrounded by partition barrier ribs one by one, so that the cathode areas of the discharge cells are substantially uniform and the discharge characteristics are improved. Stabilize. Moreover, since the individual discharge cells are clearly divided, a high-quality display with a sharp contour can be obtained, and abnormal lighting of adjacent non-selected discharge cells can be prevented.

In addition, by forming a hollow cathode by covering the entire circumference of the side surface of the first barrier rib of each discharge cell to form a hollow cathode, the negative glows of the four sides are united, whereby the driving voltage is low and the brightness is high. Can be realized.

Further, by forming a second barrier rib having the same partition shape on the upper surface of the first barrier rib partition having the emitter layer, the creeping distance between the adjacent cathodes becomes long,
It is possible to reduce insulation deterioration between the cathodes due to the deposition of the sputter substance, and it is possible to extend the life of the gas discharge display panel. By providing the groove on the upper surface of the second barrier rib, the creepage distance between the adjacent cathodes is further increased, the insulation deterioration between the cathodes is further reduced, and the life characteristics of the gas discharge display panel is further improved. It is a thing.

[Brief description of drawings]

FIG. 1A is a cutaway exploded perspective view showing an embodiment of the present invention, and FIG. 1B is a perspective view of a front substrate used in a gas discharge display panel according to an embodiment of the present invention. 2 (A) to 2 (D) are cross-sectional views of the essential part showing the manufacturing process of the present invention,
FIG. 3 is a sectional view showing the main part of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Gas discharge display panel, 2 ... Rear substrate 3 ... Cathode, 4 ... First barrier rib 5 ... Discharge cell, 7 ... Emitter layer 9 ... Second barrier rib, 10 ... Front substrate 11 ... Anode, 14 ... Groove

Claims (2)

[Scope of utility model registration request] 1. A gas in which a plurality of cathodes formed on a rear substrate and a plurality of anodes formed on a front substrate are arranged to face each other across a discharge gap, and discharge cells are formed at the intersections. In the discharge display panel, a partition-like first barrier rib is formed on the back substrate so as to surround the cathode of the discharge cell, and the cathode surface and the first barrier rib side surface are covered with an emitter layer to form a hollow cathode. And a partition-shaped second barrier rib formed on the upper surface of the first barrier rib. 2. The gas discharge display panel according to claim 1, wherein a groove is provided on the upper surface of the second barrier rib.