JP3031963B2 - Plasma display panel - Google Patents

Description

The present invention relates to a plasma display panel (hereinafter sometimes abbreviated as PDP), and more particularly, to a structure of a trigger electrode of a PDP.

[Prior Art] A plasma display panel generates a plasma discharge between electrodes facing each other in a discharge space provided between a front glass substrate and a rear glass substrate, and generates a plasma discharge from a 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 display flicker. As a PDP provided with the trigger electrode, for example, one described in Japanese Patent Application Laid-Open No. 58-30038 is known.

FIG. 2 is a perspective view of one embodiment described in the above publication, and FIG. 3 is a perspective view of another embodiment described in the above publication.

In the PDP shown in FIG. 2, an anode 22 is provided in a stripe shape on the front glass substrate 21, and the rear glass substrate
On the trigger 23, a trigger electrode 24 and a dielectric layer 25 are stacked. The trigger electrode 24 and the dielectric layer 25 are both formed so as to cover the entire display area of the rear glass substrate 23. On the dielectric layer 25, a striped cathode 26 orthogonal to the anode 22 and a striped barrier rib 27 parallel to the anode 22 are provided. Above barrier rib
Numeral 27 prevents erroneous discharge between the anodes 22 and forms a space (discharge space) in which a discharge gas is sealed between the front glass substrate 21 and the back glass substrate 23.

In the PDP shown in FIG. 3, the same components as those 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 PDP shown in FIG. 2 only in that the trigger electrode 24 has a stripe shape parallel to the cathode 26 and is formed in a region between the cathodes 26.

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

In the PDP having the trigger electrode, prior to the discharge between the anode 22 and the cathode 26, the trigger electrode is driven to discharge. The trigger driving mechanism will be described with reference to FIG. FIG. 4 is a sectional view taken along the line II of FIG. The trigger driving is divided into a trigger setting process and a trigger discharge process. First, in the trigger setting process, a positive charge 42 is generated on the dielectric layer 25 in a region 41 sandwiched between the cathodes 26. The positive charges 42 are generally called wall charges. Next, in the trigger discharge process, when a cathode for display is selected by the scan control, 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 rise of discharge for display is stabilized by the ions, so that a flicker-free display can be performed. In addition, the trigger discharge is generated by the wall charge 42 as described above.
Since the discharge is an AC discharge between the cathode and the cathode 26 and ends in a short time of 1 μs or less, the brightness by the trigger discharge is as low as 0.3 cd / m ² or less, which also contributes to the improvement of the screen contrast ratio.

[Problems to be Solved by the Invention] However, in the conventional PDP having a trigger electrode, the insulation between the trigger electrode and the cathode is performed by using a dielectric for forming wall charges. There is a problem 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 make the trigger electrode and the cathode insulated.

The dielectric layer must be thick enough to make an insulation state between the trigger electrode and the cathode having a potential difference of 250 to 300 V, and the capacitance of the dielectric is reduced by the thickness. If the dielectric layer is too thick due to its inverse proportion, it will not be possible to obtain a sufficient capacitance for trigger driving, so it is usually formed to have the above thickness.

In addition, the material used for the dielectric layer requires 10 g for a display panel having a size of 12 inches × 12 inches to cover the entire display area of the rear glass substrate, but it is expensive. In addition, in order to form the above-mentioned dielectric layer to the above-mentioned thickness, the thick-film printing of the above-mentioned dielectric paste must be repeated several times, which increases the printing and firing steps. For this reason, it was inevitable that the above-mentioned conventional PDP would be expensive.

Further, in the PDP having the above-described structure, a pinhole may be generated in the dielectric layer, resulting in insufficient withstand voltage, and there is a problem that the yield is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems of the related art, and 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 claim 1 of the present invention has a front substrate, a first electrode provided in a stripe shape on the front substrate, and facing the front substrate. A rear substrate, a second electrode provided on the rear substrate, and a stripe shape orthogonal to the first electrode in an insulating state with the second electrode on the rear substrate. The third electrode provided, between the third electrode, a dielectric layer having a dielectric constant of 14 or more provided on the second electrode, and the first layer on the back substrate A barrier rib provided in a stripe shape parallel to the electrodes, a discharge cell formed between the front substrate and the rear substrate, and a discharge gas sealed in the discharge cell; Is directly above the second electrode on the second electrode. The dielectric layer is provided on an insulator layer having a withstand voltage of 1000 V or more formed in a stripe shape, and the dielectric layer is formed on the second electrode in a region between the stripe-shaped insulator layers. It is characterized by being provided in.

The plasma display panel according to claim 2 of the present invention includes a front substrate, a first electrode provided in a stripe shape on the front substrate, and a rear substrate disposed to face the front substrate. A second electrode provided on the back substrate, and a third electrode provided in a stripe shape orthogonal to the first electrode in an insulating state with the second electrode on the back substrate. Between the third electrode, a dielectric layer having a dielectric constant of 14 or more provided on the second electrode, and provided on the back substrate in a stripe shape parallel to the first electrode. Barrier ribs, a discharge cell formed between the front substrate and the rear substrate, and a discharge gas sealed in the discharge cell, wherein the third electrode is directly provided on the rear substrate. And the second electrode is A top, is characterized in that the area between the third electrode is provided on the third electrode parallel stripes.

[Operation] In the PDP of the present invention, a dielectric layer is formed only in a region sandwiched between cathodes, and an insulator layer is formed between the trigger electrode and the cathode using a material having a withstand voltage of 1000 V or more. . According to the above configuration, the mechanism by which wall charges are formed in the upper layer of the dielectric layer formed on the trigger electrode in the region sandwiched between the cathodes by the trigger setting is the same as that of the related art, Since there is no need to insulate between the trigger electrode and the cathode, the thickness and the formation area of the dielectric layer are reduced, and the required amount of the dielectric is reduced.

Further, in another PDP of the present invention, the trigger electrode and the cathode are both formed directly on the rear substrate, and the trigger electrode is sandwiched between the cathodes, and formed with a sufficient distance for insulation. . Then, a dielectric layer is formed on the trigger electrode. According to the above configuration, a dielectric layer or an insulator layer for insulating the trigger electrode and the cathode is not required at all, and the dielectric layer may be formed only on the trigger electrode. In addition, wall charges are formed on the dielectric layer by the same trigger setting as in the prior art.

Therefore, the dose of the dielectric is reduced without reducing the effect of the trigger drive by any of the PDPs of the present invention, and the latter configuration of the present invention also improves the insulation between the trigger electrode and the cathode. Is done.

Example Hereinafter, a plasma display panel of the present invention will be described with reference to the accompanying drawings.

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

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

On the front glass substrate 1, a transparent anode 3 made of ITO or the like is provided in a stripe shape.

On the other hand, a trigger electrode 4 is provided on the entire display area on the rear glass substrate 2. An insulator layer 5 made of a material having a withstand voltage of 1000 V or more is formed on the trigger electrode 4 in a stripe shape orthogonal to the anode 3, and a cathode 6 made of a conductive material such as nickel is formed on the insulator layer 5. Have been. A dielectric layer 7 made of a material having a dielectric constant of 14 or more is formed in a region on the trigger electrode 4 between the insulator layers 5.

In this embodiment, the insulator layer 5 is made of an insulator containing lead glass as a main component (an insulator manufactured by Okuno Pharmaceutical; ELD1305).
The dielectric layer 7 has a thickness of 30 μm, and the dielectric layer 7 has a dielectric (ESL (Electrosc) mainly composed of barium titanate (BaTiO ₃ ).
ience Laboratories Inc.) (ESL # 4113). The amount of the insulator and the dielectric is, for example, 12 inches × 12
In the case where the insulator layer and the dielectric layer are formed to the above-mentioned thickness on the display panel having a size of inch, the ESL # 4113 is 2-3
g and ELD1305 are 2-3 g.

In the present embodiment, it is preferable that a protective film 8 is formed on the dielectric layer 7 using a material having excellent ion impact resistance, for example, magnesium oxide or the like to protect the surface thereof. 8 is not necessary.

Barrier ribs (not shown) are further formed on each of the components formed on the rear glass substrate 2 in a stripe shape parallel to the anode 3, and the tops thereof are in contact with the front glass substrate 1. ing.

The barrier rib is formed using a known material by a method known per se, for example, by repeating thick film printing.

In the PDP of the present embodiment, wall charges are formed on the dielectric layer 7 formed in the region sandwiched between the stripe-shaped cathodes 6 by a mechanism similar to the conventional one, and trigger discharge occurs.

Embodiment 2 FIG. 5 is a sectional view showing a configuration of another embodiment of the PDP according to the present invention.

In the PDP of this embodiment, a front glass substrate 51 and a rear glass substrate 52 are bonded together with a low-melting glass or the like to form a space (discharge space) in which a gas that emits light by plasma discharge is sealed. I have.

On the front glass substrate 51, a transparent anode 5 made of ITO etc.
3 are provided in stripes.

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

The trigger electrode 54 and the cathode 55 may be formed of the same conductive material such as nickel. When the trigger electrode 54 and the cathode 55 are formed using the same material, the trigger electrode pattern and the cathode electrode pattern can be formed simultaneously by forming the trigger electrode pattern and the cathode electrode pattern on the same mask in advance. This is convenient because it is possible to reduce

On the trigger electrode 54, a dielectric layer 56 made of a material having a dielectric constant of 14 or more is formed so as to cover the trigger electrode 54. The dielectric layer 56 is made of barium titanate (BaTiO ₃ )
(ESL (Electroscience Laborato
ries Inc.), ESL # 4113). The required amount of the dielectric is, for example, when an insulating layer and a dielectric layer are formed in the above thickness on a display panel having a size of 12 inches × 12 inches.
~ 3g.

In the present embodiment, a protective film 57 is preferably formed on the dielectric layer 56 using a material having excellent ion bombardment resistance, for example, magnesium oxide or the like, in order to protect the surface thereof. 57 is not necessary.

On each of the components formed on the rear glass substrate 52, barrier ribs (not shown) are further formed in a stripe shape parallel to the anode 53, and the tops thereof are in contact with the front glass substrate 51. ing. The barrier rib is formed using a known material by a method known per se, for example, by repeating thick film printing.

In the PDP of this embodiment, the trigger electrode 54 and the cathode 55 are formed on the back electrode 52 so as to be alternately arranged in a stripe shape parallel to each other, and the interval between both electrodes is sufficient for insulation. Distance has been taken. The trigger electrode 54 and the cathode 55 are not directly stacked on the rear glass substrate 52, instead of being laminated with an insulating layer therebetween as in the related art. With the above-described configuration of the trigger electrode 54 and the cathode 55, a sufficient insulating state can be obtained if the distance between the trigger electrode 54 and the cathode 55 is appropriately set, and the insulating layer becomes unnecessary. Therefore, there is no shortage of insulation withstand voltage due to pinholes in the insulating layer, and the insulating properties of both are improved. Also, the PD of the present embodiment
In P, a wall charge is formed on 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 so as to be in an insulated state without using a dielectric for forming wall charges, and the dielectric is formed on the cathode. It is configured to cover only the trigger electrode in the sandwiched region.

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

In a configuration in which the trigger electrode and the cathode are directly formed on the rear glass substrate as stripes arranged in parallel and alternately with each other, an insulation between the two electrodes can be obtained by appropriately setting the interval between the trigger electrode and the cathode. The effect that the property is improved is also obtained.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing the structure of one embodiment of the present invention, FIG. 2 is a perspective view showing an example of a conventional plasma display, and FIG. 3 is another example of a conventional plasma display. FIG. 4 is a sectional view taken along line II of FIG. 2 for explaining a trigger driving mechanism in a conventional plasma display, and FIG. 5 is another embodiment of the present invention. FIG. 3 is a partial cross-sectional view showing the configuration of FIG. 2, 52 ... rear glass substrate, 4, 54 ... trigger electrode, 5 ... insulator layer, 6, 55 ... cathode, 7, 56 ... dielectric layer.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Takashi Komatsu 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) References JP-A-60-230339 (JP, A) JP-A JP-A-1-137537 (JP, A) JP-A-58-30038 (JP, A) JP-A-2-230635 (JP, A) JP-A-59-61458 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) H01J 17 / 49,17 / 04 G09G 3/28

Claims (2)

(57) [Claims] 1. A front substrate, a first electrode provided in a stripe shape on the front substrate, a rear substrate arranged to face the front substrate, and a first substrate provided on the rear substrate. A second electrode, a third electrode provided on the back substrate in a striped shape orthogonal to the first electrode in an insulating state with the second electrode, and between the third electrode. A dielectric layer having a dielectric constant of 14 or more provided on the second electrode; barrier ribs provided on the back substrate in a stripe shape parallel to the first electrode; and the front surface A discharge cell formed between the substrate and the back substrate; and a discharge gas sealed in the discharge cell, wherein the third electrode is a stripe orthogonal to the first electrode on the second electrode. Withstand voltage of 1000V
A plasma provided on the insulator layer, wherein the dielectric layer is provided on a region between the stripe-shaped insulator layers on the second electrode. Display panel. 2. A front substrate, a first electrode provided in a stripe shape on the front substrate, a rear substrate arranged to face the front substrate, and a first substrate provided on the rear substrate. A second electrode, a third electrode provided on the back substrate in a striped shape orthogonal to the first electrode in an insulating state with the second electrode, and between the third electrode. A dielectric layer having a dielectric constant of 14 or more provided on the second electrode; barrier ribs provided on the back substrate in a stripe shape parallel to the first electrode; and the front surface A discharge cell formed between the substrate and the back substrate, and a discharge gas sealed in the discharge cell, wherein the third electrode is directly provided on the back substrate, and the second electrode But on the back substrate, the area between the third electrodes A plasma display panel, characterized in that provided in the third electrode parallel stripes.