JPH0448534A - Plasma display panel - Google Patents

Abstract

PURPOSE:To reduce the thickness of a dielectric layer and the forming region thereof and the required quantity of dielectric by forming the dielectric layer only in a region put in between cathodes and an insulated layer between a trigger electrode and a cathode. CONSTITUTION:A front glass substrate 51 and a back glass substrate 52 are sticked together with low melting glass, etc., wherein a space in which a gas emitting light by plasma discharge is sealed is formed. A transparent anode 53 is provided in stripes on the substrate 51. In the other hand, a trigger electrode 54 and a cathode 55 are directly provided on the substrate 52. The cathode 55 is provided in stripes which intersect at right angles with the anode 53, and the electrode 54 is formed in stripes parallel with the cathode 55 in a region caught in the anode 53 with a sufficient space so that the electrode 54 can be insulated from the cathode 55. A dielectric layer 56 made up of material whose dielectric constant is 14 or more is formed such that it covers the trigger electrode 54.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plasma display panel (hereinafter sometimes abbreviated as PDP), and more specifically to the structure of a trigger electrode of a PDP.

[Prior Art] A plasma display panel generates plasma discharge between opposing electrodes in a discharge space provided between a front glass substrate and a rear glass substrate, and discharges plasma from gas sealed in the discharge space. Display is performed by emitting light, and it has been proposed to provide a trigger electrode in order to stabilize the plasma discharge and reduce flicker in the display.

As an FDP equipped with the above-mentioned trigger electrode, for example, the one described in Japanese Unexamined Patent Publication No. 58-30038 is known.

FIG. 2 is a perspective view of one embodiment described in the above publication;
The figure is a perspective view of another embodiment described in the above publication.

In the PDP shown in FIG. 2, anodes 22 are provided in stripes on the front glass substrate 21, and a trigger electrode 24 and a dielectric layer 25 are laminated on the rear glass substrate 23. The trigger electrode 24 and dielectric layer 2
5 are formed so as to cover the entire display area of the rear glass substrate 23. A striped cathode 26 perpendicular to the anode 22 and a striped barrier rib 27 parallel to the anode 22 are provided on the dielectric layer 25 . The barrier ribs 27 prevent erroneous discharge between the anodes 23 and form a space (discharge space) filled with discharge gas between the front glass substrate 21 and the back glass substrate 22.

In the PDP shown in FIG. 3, the same components as in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. Third
The PDP shown in the figure differs from the FDP shown in FIG. 2 only in that the trigger electrode 24 is striped in parallel with the cathodes 26 and is formed in the region between the cathodes 26.

In both of the PDPs shown in FIGS. 2 and 3, the dielectric layer 25 is formed to cover the entire display area of the rear glass substrate 23.

In the FDP having the trigger electrode, the trigger electrode is driven and discharge occurs prior to discharge between the anode 22 and cathode 26. The mechanism for driving the trigger will be explained based on FIG. 4. FIG. 4 is a sectional view taken along the line II in FIG. 2. The trigger driving described above is divided into a trigger setting process and a trigger discharging process. First, in the trigger setting process, the region 41 sandwiched between the cathodes 26
Positive charges 42 are generated in the upper layer of the dielectric layer 25 . The positive charge 42 is generally called a wall charge.

Next, in the trigger discharge process, when a cathode for display is selected by the scan control, a discharge occurs between the selected cathode 26 and the positive wall charge 42 at that moment.

Ions are generated in the discharge space by the trigger discharge, and the ions stabilize the rise of the discharge for display, so that flicker-free display can be performed.

Further, as described above, the trigger discharge is an AC discharge between the wall charge 42 and the cathode 26, and ends in a short time of 1 μs or less, and the brightness due to the trigger discharge is 0.3 cd/r.
Since it is as low as rr or less, it also contributes to improving the contrast ratio of the screen.

[Problems to be Solved by the Invention] However, in a conventional PDP having a trigger electrode, insulation between the trigger electrode and the cathode is performed using a dielectric material for forming wall charges. There is a problem in that it must be formed so as to cover the entire display area of the rear glass substrate, and furthermore, it must be formed to a thickness of 50 to 60 μm in order to insulate the trigger electrode and the cathode.

The dielectric layer must be thick enough to insulate the trigger electrode and cathode, which have a potential difference of 250 to 300 V, and the capacitance of the dielectric depends on its thickness. Because of the inverse proportionality, if the dielectric layer is made too thick, it will not be possible to obtain sufficient capacitance to drive the trigger, so it is usually formed to have the above-mentioned thickness.

In addition, in order to form the material used for the dielectric layer to cover the entire display area of the rear glass substrate, 10 g is required for a 12 inch x 12 inch display panel; The method itself is expensive, and in order to form the dielectric layer to the thickness described above, thick film printing of the dielectric paste must be repeated several times, which increases the number of printing and firing steps. For this reason, the above-mentioned conventional FDP inevitably increases in cost.

Furthermore, in the PDP having the above structure, pinholes may be formed in the dielectric layer, resulting in insufficient dielectric strength, and there is also a problem that the yield is reduced.

Therefore, the present invention has been made to solve the problems of the prior art as described above, and its purpose is to:
An object of the present invention is to provide an inexpensive plasma display panel having a trigger electrode.

[Means for Solving the Problems] A plasma display panel according to the present invention includes a front substrate, a first electrode provided in a stripe pattern on the front substrate, and a first electrode arranged opposite to the front substrate. a second electrode provided on the back substrate; and a stripe formed on the back substrate insulated from the second electrode and perpendicular to the first electrode. A third electrode, a dielectric layer having a dielectric constant of 14 or more provided on the second electrode between the third electrode, and a dielectric layer provided on the back substrate to prevent erroneous discharge between the first electrode. Barrier ribs are provided in a stripe pattern parallel to the first electrode to prevent the discharge of visible light by discharge. and a discharge gas that generates light.

In one embodiment of the plasma display panel, the third electrode has a dielectric strength of 1000 V and is formed on the second electrode in a stripe shape orthogonal to the first electrode.
The dielectric layer is provided on the insulator layer, and the dielectric layer is provided on the insulator layer.
The third electrode is provided in a region between the insulator layers formed in a stripe shape on the second electrode, and in another aspect, the third electrode is provided on the rear substrate. The second electrode is provided directly on the rear substrate in a region between the third electrodes in a stripe shape parallel to the third electrodes.

[Function] In the FDP of the present invention, a dielectric layer is formed only in the region sandwiched between the cathodes, and an insulator layer is formed between the trigger electrode and the cathode using a material with a dielectric strength of 100 OV or more. . According to the above configuration, the mechanism in which wall charges are formed on the upper layer of the dielectric layer formed on the trigger electrode in the region sandwiched between the cathodes due to trigger setting is the same as before, but the dielectric layer Since there is no need to insulate between the trigger electrode and the cathode, the thickness and formation area of the dielectric layer can be reduced, and the amount of dielectric required can be reduced.

Further, in another FDP of the present invention, both the trigger electrode and the cathode are formed directly on the back substrate, and the trigger electrode is sandwiched between the cathodes and is formed at a distance sufficient for insulation. . A dielectric layer is formed on the trigger electrode. According to the above configuration, there is no need for a dielectric layer or an insulator layer to insulate the trigger electrode and the cathode, and the dielectric layer only needs to be formed on the trigger electrode, reducing the amount of dielectric required. Moreover, wall charges are formed on the upper layer of the dielectric layer by trigger setting similar to the conventional method.

Therefore, with any FDP of the present invention, the required dielectric material m is reduced without reducing the trigger drive effect, and the latter configuration of the present invention also improves the insulation between the trigger electrode and the cathode. be done.

[Example] Hereinafter, a plasma display panel of the present invention will be described based on the accompanying drawings.

1 fire pit.

FIG. 1 is a sectional view showing the structure of an embodiment of a PDP according to the present invention.

In the FDP of this embodiment, a front glass substrate 1 and a rear glass substrate 2 are bonded together using low-melting glass or the like to form a space (discharge space) in which a gas that emits light by plasma discharge is sealed. There is.

Transparent anodes 3 made of ITO or the like are provided in stripes on a front glass substrate 1.

On the other hand, a trigger electrode 4 is provided on the entire display area on the rear glass substrate 2. On the trigger electrode 4, an insulator layer 5 made of a material with a dielectric strength of 1000 cm or more is placed on the anode 3.
The insulator layer 5 is formed in a stripe shape orthogonal to the insulator layer 5.
A cathode 6 made of a conductive material such as nickel is formed thereon. A dielectric layer 7 made of a material having a dielectric constant of 14 or more is provided in a region sandwiched between the insulator layers 5 on the trigger electrode 4.
is formed.

In this embodiment, the insulator layer 5 is made of lead glass-based insulator (Okuno Pharmaceutical Insulator; ELD1305) with a thickness of 30 μm, and the dielectric layer 7 is made of barium titanate (ELD1305). Dielectric material (E S L (Electrosscience) whose main component is B a Ti Os)
Laboratories rnc, ) dielectric; E
SL#4113) to a thickness of 20 to 25 μm. For example, when forming an insulator layer and a dielectric layer with the above thickness on a display panel with a size of 12 inches x 12 inches, the required amount of the above insulator and dielectric material is 2 to 3 g of ESL#4113. , ELD130
5 is 2 to 3 g.

In this embodiment, it is preferable that a protective film 8 is formed on the dielectric layer 7 using a material having excellent ion bombardment resistance, such as magnesium oxide, in order to protect its surface. 8 is not necessarily necessary.

On each component formed on the rear glass substrate 2, barrier ribs (not shown) are further formed in the form of stripes parallel to the anode 3, and the tops thereof are in contact with the front glass substrate 1. ing.

The barrier lip is formed using a known material and by a method known per se, such as repeated thick film printing.

In the FDP of this embodiment, wall charges are formed in the upper layer of the dielectric layer 7 formed in the region sandwiched between the cathodes 6 formed in stripes by a mechanism similar to the conventional one, and a trigger discharge occurs.

FIG. 5 is a sectional view showing the structure of another embodiment of the FDP according to the present invention.

In the FDP of this embodiment, a front glass substrate 51 and a rear glass substrate 52 are bonded together using low melting point glass or the like.
Inside thereof, a space (discharge space) is formed in which gas that emits light by plasma discharge is sealed.

Transparent anodes 53 made of ITO or the like are provided in stripes on the front glass substrate 51.

On the other hand, a trigger electrode 54 and a cathode 55 are provided directly on the rear glass substrate 52. The cathode 55 is the anode 53
The trigger electrode 54 is provided in a stripe shape parallel to the cathode 55 in a region sandwiched between the anodes 53 formed in the stripe shape, and is insulated from the cathode 55. They are formed at sufficient intervals.

The trigger electrode 54 and cathode 55 may be formed of the same conductive material such as nickel. Trigger electrode 54
and when the cathode 55 is formed using the same material,
By forming the trigger electrode pattern and the cathode electrode pattern on the same mask in advance, they can be formed at the same time, which is advantageous because the printing process can be reduced.

A dielectric layer 56 made of a material having a dielectric constant of 14 or more is formed on the trigger electrode 54 so as to cover the trigger electrode 54 . The dielectric layer 56 is made of barium titanate (
A dielectric material (E S L (BaTiOs) as a main component)
Electroscience Laboratory
It is formed to a thickness of 20 μm using a dielectric (ESL #4113) manufactured by esInc. The required amount of the dielectric material is, for example, 2 to 3 g when forming an insulator layer and a dielectric layer with the above thickness on a display panel having a size of 12 inches by 12 inches.

In this embodiment, it is preferable that a protective film 57 is formed on the dielectric layer 56 using a material having excellent ion bombardment resistance, such as magnesium oxide, in order to protect the surface of the dielectric layer 56. 57 is not necessarily necessary.

Further, on each component formed on the rear glass substrate 52, barrier ribs (not shown) are formed in a stripe shape parallel to the anode 53, and the top thereof is formed on the front glass substrate 5.
It is formed so as to be in contact with 1. The barrier ribs are formed using known materials and by methods known per se, such as repeated thick film printing.

In the FDP of this embodiment, the trigger electrode 54 and the cathode 55 are formed on the back electrode 52 in parallel stripes and alternately arranged, and the interval between the two electrodes is sufficient for insulation. Distance is maintained. The trigger electrode 54 and the cathode 55 are not laminated with an insulating layer in between, as in the conventional case, but are both formed directly on the back glass substrate 52. By configuring the trigger electrode 54 and the cathode 55 as described above, a sufficient insulating state can be obtained by appropriately setting the distance between the two, and an insulating layer is completely unnecessary. Therefore, insufficient dielectric strength due to pinholes or the like in the insulating layer does not occur, and the insulation between the two is improved. Further, in the PDP of this embodiment, wall charges are formed on the upper layer of the dielectric layer 56 formed on the trigger electrode 55 by a mechanism similar to the conventional one, and a trigger discharge occurs.

[Effects of the Invention] In the plasma display panel of the present invention, the trigger electrode and the cathode are formed in an insulated state without using a dielectric material for forming wall charges, and the dielectric material is insulated from the cathode. It only covers the trigger electrode in the sandwiched area.

Therefore, according to the present invention, the amount of dielectric material, which is an expensive material, required can be reduced, and an inexpensive plasma display panel can be provided without reducing the effect of trigger driving.

In addition, in a configuration in which the trigger electrodes and cathodes are formed directly on the back glass substrate as stripes arranged parallel to each other and alternately, insulation between the trigger electrodes and cathodes can be set appropriately. It also has the effect of improving sex.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing the configuration of an embodiment of the present invention, FIG. 2 is a perspective view showing an example of a conventional plasma display, and FIG. 3 is a perspective view showing an example of a conventional plasma display. FIG. 4 is a cross-sectional view taken along the line I-■ in FIG. 2 for explaining the trigger drive mechanism in a conventional plasma display, and FIG. FIG. 2 is a partial cross-sectional view showing the configuration of an embodiment. 2.52... Rear glass substrate, 4.54... Trigger electrode, 5... Insulator layer, 6.55... Cathode, 7.56... Dielectric layer. -9gu left I3'J fN cutting i mouth 1 Figure patent applicant Oki Electric Industry Co., Ltd. agent Patent attorney 1) Actual figure 2 I47 r 2 roast /J-J 1ffi &3
(See Σn) Figure 3, Figure 4, Figure Izo, Bu ()ba, Line, Figure 5, Figure 5

Claims (2)

[Claims] (1) a front substrate; a first electrode provided in a stripe pattern on the front substrate; a back substrate disposed opposite to the front substrate; and a first electrode provided on the back substrate. a second electrode, a third electrode provided on the rear substrate in a stripe shape insulated from the second electrode and perpendicular to the first electrode; A dielectric layer with a dielectric constant of 14 or more provided on the second electrode and a stripe pattern parallel to the first electrode are formed on the rear substrate to prevent erroneous discharge between the first electrode and the second electrode. The device is characterized by comprising a barrier rib provided therein, a discharge cell formed between the front substrate and the rear substrate, and a discharge gas sealed in the discharge cell and generating light including visible light by discharge. plasma display panel. (2) The third electrode is provided on an insulator layer having a dielectric strength of 1000 V or more, which is formed in a stripe shape orthogonal to the first electrode on the second electrode, and the dielectric layer 2. The plasma display panel according to claim 1, wherein the plasma display panel is provided in a region between the striped insulating layers on the second electrode. (3) The third electrode is provided directly on the back substrate, and the second electrode is provided in a region between the third electrodes on the back substrate parallel to the third electrode. The plasma display panel according to claim 1, characterized in that the plasma display panel is provided in a stripe shape.