JPH06131980A - Gas discharge light emitting element - Google Patents

Abstract

PURPOSE:To provide a high-intensity, high-efficiency gas discharge light emitting element without largely changing the conventional structure. CONSTITUTION:A phosphor (fluorescent screen 16) emitting the visible light is excited by utilizing the ultraviolet rays generated by the gas discharge in a discharge cell, the visible light is seen in a gas discharge light emitting element, a phosphor excited by the ultraviolet rays generated by a gas discharge and emitting the ultraviolet rays having the wavelength longer than the excitation wavelength is arranged on part or the whole of the surface of the structure (cell barrier 13 or cathode 15) in the discharge cell provided with no phosphor emitting the visible light, or part or the whole of the structure in the discharge cell provided with no phosphor emitting the visible light is formed with a material containing the similar phosphor emitting the ultraviolet rays. Such portion as the cell barrier 13 not contributing to luminescence in the past can be utilized as a luminescence exciting source, and a high-intensity, high-efficiency gas discharge light emitting element can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas discharge light emitting device in which a visible light emitting phosphor is excited by utilizing ultraviolet rays generated by a gas discharge and the visible light is visually recognized.

[0002]

2. Description of the Related Art Conventionally, as a typical example of this type of gas discharge light emitting device, a plasma display panel (hereinafter, referred to as
(Referred to as PDP) is known.

FIG. 4 shows one configuration example of a conventional DC type PDP. As shown in the figure, this DC type P
In the DP, a flat plate-shaped front plate 11 and a rear plate 12 made of glass are arranged in parallel and opposite to each other, and both are held at a constant interval by a cell barrier 13 provided therebetween. ing. Further, an anode 14 is formed on the back side of the front plate 11 and the back plate 12
A cathode 15 is formed on the front surface side of the anode orthogonally to the anode 14, and a phosphor screen 16 is formed adjacent to both sides of the anode 14.

In the above conventional DC type PDP, a front plate 11 and a back plate 12 are formed by applying a predetermined voltage from a DC power source between the anode 14 and the cathode 15 to form an electric field.
Gas discharge is performed inside each cell 17 as a display element configured by the cell barrier 13 and the cell barrier 13. Then, by the ultraviolet rays generated by this gas discharge, the fluorescent screen 1 on the back side of the front plate 11
The visible light 6 emitted from the front plate 11 is visually recognized by an observer.

FIG. 5 shows an example of the structure of a conventional AC PDP. As shown in FIG.
In the C-type PDP as well, as in the case of the DC-type PDP, a flat plate-shaped front plate 21 and a rear plate 22 made of glass are arranged in parallel and opposite to each other, and both are provided between them. The cell barriers 23 are held at regular intervals. Further, in this AC type PDP, two electrodes 2 which are orthogonal to each other are provided on the front surface side of the back plate 22.
4, 25 are formed via a dielectric layer 26, a dielectric layer 27 and a protective layer 28 are further formed on the front side thereof, and a fluorescent screen 29 is formed on the back side of the front plate 21. Has become.

In the conventional AC PDP, a front plate 21 and a rear plate 22 are formed by applying a predetermined voltage from an AC power source between the two electrodes 24 and 25 to form an electric field.
Gas discharge is performed inside each cell 30 as a display element including the cell barrier 23 and the cell barrier 23. Then, due to the ultraviolet rays generated by this gas discharge, the fluorescent screen 2 on the back side of the front plate 21
The visible light 9 emitted from the front plate 21 is visually recognized by the observer.

By the way, in the above PDP,
The light emitted from the fluorescent screen passes through the fluorescent screen itself and is visually recognized by an observer, so that the amount of light decreases when the fluorescent screen is transmitted. Therefore, for the purpose of increasing the brightness, a structure in which the reflected light from the fluorescent surface is visually recognized, or a PDP in which the fluorescent surface is formed on the wall surface of the cell barrier and the reflected light of the light emitted from the wall surface is directly viewed is also used. Proposed.

[0008]

However, in any of the above PDPs, not all ultraviolet rays generated by gas discharge hit the phosphors that emit visible light, and a considerable amount of ultraviolet rays constitutes discharge cells. It is not used for the excitation of a phosphor that contributes to the emission of visible light by being hindered by a structure such as a cell barrier. Therefore, there is a problem that sufficient brightness and luminous efficiency are not obtained.

The present invention has been made in view of the above problems, and an object thereof is to provide a gas discharge light emitting device having high brightness and high efficiency without largely changing the conventional structure. To provide.

[0010]

In order to achieve the above object, the present invention excites a visible light emitting phosphor by utilizing ultraviolet rays generated by a gas discharge in a discharge cell and visually recognizes the visible light. In the gas discharge light-emitting element that is made to be excited by ultraviolet rays generated by gas discharge on a part or the whole of the surface of the structure in the discharge cell in which the phosphor for visible light emission is not provided, ultraviolet rays longer than the excitation wavelength are emitted. Characterized by arranging a phosphor that emits light, or by forming a part or the whole of the structure in the discharge cell in which the phosphor that emits visible light is not provided with a substance containing a phosphor that emits similar ultraviolet light. It is what

[0011]

In the gas discharge light emitting device having the above-described structure, the ultraviolet light emitting phosphor plays a role of increasing the amount of ultraviolet light contributing to the excitation of the visible light emitting phosphor.

[0012]

Embodiments will be described below with reference to the drawings.

FIG. 1 shows an example of a DC type PDP as a gas discharge light emitting device according to the present invention. As shown in FIG. 1, a front plate 11 and a rear plate 12 are spaced by a cell barrier 13 at regular intervals. The anode 14 is held on the back side of the front plate 11 and the cathode 15 on the front side of the back plate 12.
4, and a phosphor screen 16 made of a phosphor that emits visible light is formed adjacent to each other on both sides of the anode 14. In addition, in this embodiment, the cell barrier 13 is formed of a phosphor that emits ultraviolet rays.

This DC type PDP is manufactured by the same procedure as that of the conventional one, but the cell barrier 13 is formed of an ultraviolet light emitting phosphor as described above. Specifically, for example, it is formed as follows.

First, a cathode 1 having a film thickness of 20 μm, a width of 200 μm and a pitch of 300 μm is formed on a back plate 12 made of glass.
5 is formed. Such a shape can be easily formed by, for example, a screen printing method. In addition, the electrode material should be N-type in consideration of sputtering resistance and secondary electron emission coefficient.
It is preferable to use an i alloy.

Next, one cathode 15 has a width of 120 μm and a height of 200 μm so that one cathode 15 constitutes one display cell.
A 300 μm × 300 μm lattice-shaped cell barrier 13 is formed. The cell barrier 13 is mainly composed of a phosphor that emits ultraviolet rays. At this time, the cell barrier 13 can be formed by the same screen printing method as described above, for example, by performing multi-layer printing of 8 to 10 layers. The phosphors that emit ultraviolet rays include (Ba, Mg, Zn) ₃ SiO ₇ : Pb, Ca.
O: Fe, ZrP ₂ O ₇ , LaF ₃ : Ce, (LaA
l) F ₃ : Ce or the like can be used. Then 6
Back plate 1 by baking at about 00 ℃ for 30 minutes
The cathode 15 and the cell barrier 13 are fixed onto the surface 2.

Then, the anode 14 and the phosphor screen 1 are provided on the front plate 11.
6 is formed, and the front plate 11 and the back plate 12 are sealed and filled with gas to form the DC PDP shown in FIG.

In the DC type PDP of the embodiment shown in FIG. 2, the cathode 15 which is an electrode on the back plate 12 has a two-layer structure, and the upper electrode 15a is provided so as to cover the lower electrode 15b. Has been. The upper electrode 15a exposed in the discharge space is mixed with a phosphor that emits ultraviolet rays. The electrode of the back plate 12 is not necessarily limited to the cathode.

The back plate 12 in this type of DC PDP is specifically formed by the following procedure, for example.

First, a Ni electrode, which is the lower electrode 15b, is formed on a back plate 12 made of glass, and a Ni electrode is mixed with a phosphor that emits ultraviolet rays so as to cover the Ni electrode. The electrode 15a is formed. Then, in the same manner as described above, a width of 120 μm and a height of 20
After forming a grid-like cell barrier 13 of 0 μm and 300 μm × 300 μm, it is baked at about 600 ° C. for 30 minutes to fix the cathode 15 and the cell barrier 13 on the back plate 12.

FIG. 3 shows an example of an AC type PDP as a gas discharge light emitting device according to the present invention. As shown in FIG. 3, the front plate 21 and the rear plate 22 are spaced by a cell barrier 23 at regular intervals. Two electrodes 24 and 25 which are held and are orthogonal to each other are provided on the front surface side of the back plate 22 via a dielectric layer 26, and a dielectric layer 27 and a protective layer 28 are further provided on the front surface side thereof. Further, on the rear surface side of the front plate 21, a fluorescent surface 29 made of a fluorescent substance that emits visible light is formed. Also in this embodiment, the cell barrier 23 is made of a phosphor that emits ultraviolet rays.

The AC type PDP of this embodiment is formed by the same manufacturing procedure as the conventional AC type PDP, but the cell barrier 23 is used.
Is formed mainly with a phosphor that emits ultraviolet light as described in FIG.

Here, when the luminance and the luminous efficiency of the PDP manufactured according to the above-mentioned respective examples were measured, a great improvement in characteristics was obtained.

In the embodiments shown in FIGS. 1 and 3, the cell barrier itself is formed of a phosphor that emits ultraviolet light. However, the same effect can be obtained by coating the surface of the cell barrier with a phosphor that emits ultraviolet light. Was obtained.

[0025]

As described above, according to the present invention, ultraviolet rays generated by gas discharge in a discharge cell are used to excite a fluorescent substance that emits visible light so that the visible light can be visually recognized. In the device, a phosphor that emits ultraviolet rays longer than the excitation wavelength is disposed on part or all of the surface of the structure in the discharge cell in which the phosphor for visible light emission is not provided, which is excited by the ultraviolet rays generated by the gas discharge. Alternatively, since a part or the whole of the structure in the discharge cell not provided with the visible light emitting phosphor is formed of a substance containing the similar ultraviolet light emitting phosphor, the conventional structure such as a cell barrier is used. Since the portion that did not contribute to light emission can be used as a light emission excitation source, it is possible to form a gas discharge light emitting device with high brightness and high efficiency without significantly changing the conventional conditions such as the structure.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an example of a DC type plasma display panel as a gas discharge light emitting device according to the present invention.

FIG. 2 is a partial cross-sectional view showing another example of a DC type plasma display panel as a gas discharge light emitting device according to the present invention.

FIG. 3 is a partial cross-sectional view showing an example of an AC type plasma display panel as a gas discharge light emitting device according to the present invention.

FIG. 4 is a partial cross-sectional view of a configuration example of a conventional DC type plasma display panel.

FIG. 5 is a partial cross-sectional view of a configuration example of a conventional AC type plasma display panel.

[Explanation of symbols]

 11 Front Plate 12 Back Plate 13 Cell Barrier 14 Anode 15 Cathode 16 Fluorescent Surface 17 Cell 21 Front Plate 22 Back Plate 23 Cell Barrier 24, 25 Electrode 26, 27 Dielectric Layer 28 Protective Layer 29 Fluorescent Surface 30 Cell

Claims (2)

[Claims] 1. In a gas discharge light-emitting device in which visible light emitting phosphor is excited by utilizing ultraviolet rays generated by gas discharge in a discharge cell and the visible light is visually recognized, the visible light emitting phosphor is A gas discharge light-emitting device characterized in that a phosphor that is excited by ultraviolet rays generated by gas discharge and emits ultraviolet rays longer than an excitation wavelength is arranged on a part or the whole of the surface of a structure in a discharge cell not provided. 2. A gas discharge light-emitting element, wherein a visible light-emitting phosphor is excited by utilizing ultraviolet rays generated by gas discharge in a discharge cell and the visible light is visually recognized. A gas discharge light emitting device, characterized in that a part or the whole of the structure in the discharge cell not provided is formed by a substance containing a phosphor that is excited by ultraviolet rays generated by gas discharge and emits ultraviolet rays longer than the excitation wavelength. .