JP2002367520A - Plasma display panel and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel having high discharge stability and a method for manufacturing the same. SOLUTION: Phosphor layers 10 to 12 made of phosphor particles
The impure gas adsorption layer 8 is provided below.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plasma display panel and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, there has been a demand for higher performance of displays such as high-quality displays and large screens.
Various displays have been developed. CRT displays,
Examples include a liquid crystal display (LCD) and a plasma display panel (PDP).

A conventional plasma display panel will be described below with reference to the drawings. FIG. 7 is a cross-sectional view schematically showing an AC-type (AC-type) plasma display panel.

In FIG. 7, a first plate has a front glass substrate 41 on which a sustain electrode and a scan electrode 42 are formed. Further, these electrodes 42 are covered with a dielectric layer 43 and a magnesium oxide (MgO) protective layer 44.

The second plate is a back glass substrate 4
An address electrode 46, a partition wall 47, and a phosphor layer (50 to 52) are provided on 5 and 49 is a discharge space for filling a discharge gas. In the phosphor layer, phosphor layers of three colors of red 50, green 51, and blue 52 are sequentially arranged for color display. Each of the above phosphor layers (50 to 5)
2) is excited and emitted by vacuum ultraviolet rays (wavelength: 147 nm) having a short wavelength generated by discharge.

The following materials are generally used as the phosphor constituting the phosphor layers 50-52.

"Blue phosphor": BaMgAl ₁₀ O ₁₇ : E
u “Green phosphor”: Zn ₂ SiO ₄ : Mn or BaAl ₁₂
O ₁₉ : Mn “Red phosphor”: Y ₂ O ₃ : Eu or (Y _x Gd _{1 -x} ) B
O ₃ : Eu A gas mixture of Ne—Xe or the like is sealed in the discharge space between the two glass substrates, and the phosphor layer (50 to 52) is formed by vacuum ultraviolet light (147 nm) having a short wavelength generated by the discharge.
Are excited, and visible light of R, G, B is emitted from the front glass substrate side to perform color display.

[0008]

SUMMARY OF THE INVENTION However, PDP
During operation, impurity gas is generated from panel members such as the protective layer 44 and the phosphor layers (50 to 52) due to ion bombardment or heat due to discharge. There is a problem that discharge characteristics such as a discharge voltage and a discharge current change due to the influence of the impurity gas, and a discharge failure occurs.

Conventionally, there has been a means of providing a getter material as a method of removing these impurity gases. However, in the process, the getter material must be provided at the end of the panel, and is insufficient for removing the impurity gas at the center of the panel. Met.

[0010] The present invention has been made in view of the above problems, and an object of the present invention is to provide a PDP having high discharge stability and a method for manufacturing the same.

[0011]

In order to solve the above-mentioned problems, a plasma display panel according to the present invention comprises a first plate having a pair of parallel phosphor layers or electrodes composed of at least phosphor particles and a second plate. A plasma display panel in which a discharge space in which a gas medium is sealed is formed between two plates, wherein an impurity gas adsorption layer made of a material that adsorbs an impurity gas is formed below the phosphor layer. And

In the above structure, a discharge space filled with a gas medium is provided between a first plate having at least a pair of electrodes arranged in parallel and a second plate having at least a partition and a phosphor layer made of phosphor particles. In the formed plasma display panel, it is preferable that the second plate has a partition wall and a phosphor layer formed on at least an upper surface of the impurity gas adsorption layer.

A discharge space in which a gas medium is sealed is formed between a pair of first plates having at least electrodes arranged in parallel and a second plate having at least partition walls and a phosphor layer made of phosphor particles. In the plasma display panel, it is preferable that the second plate has an impurity gas adsorption layer formed on at least the partition wall surface, and a phosphor layer formed on an upper surface of the impurity gas adsorption layer.

Further, it is preferable that the impurity gas adsorption layer is formed of a thin film.

Further, it is preferable that the impurity gas adsorption layer is made of particles.

It is preferable that the particle filling rate of the impurity gas adsorption layer is higher than the particle filling rate of the phosphor layer.

Further, the average particle diameter of the impure gas adsorption layer is as follows:
It is preferably smaller than the average particle size of the phosphor layer.

In the plasma display panel of the present invention, a gas medium is sealed between a first plate and a second plate having a pair of parallelly arranged phosphor layers, at least phosphor particles, partitions or electrodes. A plasma display panel having a discharge space formed therein, wherein the partition walls are formed of a material that adsorbs impure gas.

In the above structure, it is preferable that no phosphor layer is formed between successive discharge cells of the same color.

Further, the impurity gas adsorption layer is made of MgO, Ca
It is preferable to be made of an alkaline earth oxide material of any of O, SrO, and BaO or a material containing the above material.

The method of manufacturing a plasma display panel according to the present invention includes, after the step of forming an impurity gas adsorption layer composed of a thin film, a step of forming a partition wall and a step of applying phosphor particles to form a phosphor layer. It is characterized by the following.

Further, the method of manufacturing a plasma display panel according to the present invention includes, after the step of forming a partition, a step of forming an impurity gas adsorbing layer composed of a thin film and a step of applying phosphor particles to form a phosphor layer. It is characterized by the following.

Further, in the method for manufacturing a plasma display panel according to the present invention, after the step of forming the partition walls, a step of applying particles made of a material that adsorbs the impure gas to form an impure gas adsorbing layer, and a step of applying phosphor particles. It is characterized by passing through a step of forming a phosphor layer.

In the above structure, it is preferable that a heating step of heating the plate on which the phosphor layer is formed in a dry atmosphere is provided after the step of forming the phosphor layer.

Further, after the step of forming the phosphor layer, a heating step of heating the plate on which the phosphor layer is formed in a dry atmosphere is provided, and the steps from the heating step to the sealing step are continuously performed in the dry atmosphere. It is preferable to carry out.

It is preferable that the steps from the sealing step to the evacuation step be performed continuously in a dry atmosphere.

Preferably, the drying atmosphere in the heating step or the sealing step of the plate on which the phosphor layer is formed is an oxygen gas or a gas containing oxygen.

The drying atmosphere is preferably a gas atmosphere having a dew point of −20 ° C. or less.

Further, it is preferable to apply an AC voltage to the electrodes below the phosphor layer in the aging step of stabilizing the discharge voltage by applying a voltage between the electrodes and discharging the battery for a predetermined time.

Further, the plasma display device of the present invention is characterized in that it is a plasma display panel display device including the plasma display panel and a driving circuit for driving the plasma display panel.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Configuration of PDP) FIG. 1 is a partial sectional view showing a main configuration of an AC surface discharge type plasma display panel (hereinafter simply referred to as "PDP") according to an embodiment of the present invention. is there.

As shown in FIG. 1, the structure of the PDP is roughly divided into a first plate and a second plate arranged with their main surfaces facing each other.

A front glass substrate 1 serving as a substrate of the first plate has a plurality of strip-shaped pairs of display electrodes 2 on one main surface thereof.
(Sustain electrodes and scan electrodes).

On the front glass substrate 1 on which the display electrodes 2 are provided, a dielectric layer 3 and a protective layer 4 made of magnesium oxide are sequentially formed over the entire main surface of the glass.

On the back glass substrate 5 serving as the substrate of the second plate, a plurality of address electrodes 6 are arranged on one main surface in a stripe pattern at regular intervals.
The dielectric layer 7 is formed over the entire surface of the rear glass substrate 5 so as to include An impure gas adsorbing layer 8 made of a material thin film that adsorbs an impure gas is formed on the dielectric layer 7, a partition wall 9 is arranged in accordance with a gap between adjacent address electrodes 6, and two adjacent partition walls are provided. 9 on the side of the impurity gas adsorption layer 8 and red (R),
Phosphor layers 10 to 12 corresponding to green (G) and blue (B) are formed.

The first plate and the second plate having such a structure are opposed to each other so that the longitudinal directions of the address electrode 6 and the display electrode 2 are orthogonal to each other, and the outer peripheral edges of both plates are sealed with glass frit. Is being worn. A discharge gas (filled gas) composed of a rare gas component such as He, Xe, Ne or the like is provided between the two plates at a predetermined pressure (usually 500 to 6).
00 Torr (about 66.5 to 79.8 kPa)).

(Operation of PDP) When the PDP is driven, a pulse is applied to the address electrode 6 and the display electrode 2 by a panel driving unit (not shown) to perform a write discharge (address discharge). A pulse is applied to the electrode 2. As a result, the display electrode 2 on which the address discharge has been performed.
The discharge is started in the gap. Then, sustain discharge is performed in the discharge space, and screen display is performed.

Here, the main feature of the present embodiment is that an impure gas adsorption layer 8 made of a material thin film that adsorbs the impure gas,
The present invention resides in a method of manufacturing a PDP having this configuration.

During the operation of the PDP, the impurity gas generated from the panel member is removed from the phosphor layer 10 formed of the phosphor particles.
Through the gaps of ~ 12, the gas reaches the impurity gas adsorption layer 8 and is adsorbed. As a result, an increase in impurity gas in the discharge space due to the discharge is suppressed, and a stable operation can be realized.

The generated impure gas contains a large amount of water vapor. Therefore, the material of the impurity gas adsorption layer 8 is preferably an alkaline earth oxide material of MgO, CaO, SrO, or BaO. This is because these materials adsorb impurity gases such as water vapor and carbon dioxide by a chemical reaction, so that the impurity gas once adsorbed is hardly desorbed.

(Method of Manufacturing PDP) PD of this embodiment
FIG. 2 shows a manufacturing process diagram of P.

The method of manufacturing a PDP according to the present embodiment includes a front substrate protective layer forming step of forming a protective layer made of magnesium oxide on a front glass substrate on which a dielectric has been formed, an impurity gas adsorption layer, partition walls, and phosphor particles. A heating step of heating in a dry atmosphere the back glass substrate formed up to a phosphor layer composed of and a frit for sealing (frit baked), an alignment step for aligning these substrates, and a sealing step for sealing thereafter; An exhausting step of exhausting the inside of the panel after sealing and filling a discharge gas was performed, and these manufacturing steps (including transportation) were continuously performed in a dry atmosphere using a dry gas supply device.

As a dry gas for realizing a dry atmosphere, air, oxygen, nitrogen or the like can be used, but a gas having a dew point of −20 ° C. or less is desirable, and a temperature of −40 ° C. or less is more desirable.

The impurity gas adsorbing layer made of a thin film of an alkaline earth oxide material of any of MgO, CaO, SrO, and BaO was formed by a vapor deposition method, but may be formed by a known sputtering method or a CVD method instead of the vapor deposition method. can do.

In these steps, a relatively simple apparatus is introduced by introducing a dry gas into a room having a certain degree of hermeticity and maintaining the inside in a dry gas atmosphere having a positive pressure higher than the atmospheric pressure. Thus, a dry gas atmosphere could be realized.

It is preferable that the impure gas adsorbing layer composed of a thin film of an alkaline earth oxide material of any of MgO, CaO, SrO and BaO does not contain water vapor until the panel is completed. Therefore, each step is performed in a dry atmosphere as described above to suppress the inclusion of moisture in the impurity gas adsorption layer. Thereby, the impurity gas generated during the operation of the PDP can be efficiently adsorbed to the impurity gas adsorption layer,
Stable driving is possible.

In this embodiment, the phosphor layer is provided continuously between adjacent cells of the same color. However, as shown in FIG. When the configuration is not provided, the impurity gas adsorbing layer 16 is exposed at that portion, so that the impurity gas generated in the panel easily reaches the impurity gas adsorbing layer 16 more efficiently, and the discharge stability is improved. I do.

In the present embodiment, the heating step of heating the second plate, on which the impurity gas adsorption layer and the phosphor layer are formed, in a dry gas atmosphere in order to remove moisture adhering thereto beforehand is performed. However, the dry gas in this step is desirably an oxygen gas or a gas containing oxygen. This is because there are many oxide phosphors as phosphors for PDP, and when heated in an oxygen-free atmosphere, oxygen deficiency or the like may occur and deteriorate.

Conventionally, a completed panel is provided with an aging step of discharging for a predetermined time in order to stabilize discharge characteristics and light emission characteristics. In this aging step, an AC voltage is generally applied between the sustain electrode and the scan electrode, which are the main discharge.

However, a large amount of impurity gas, which is a problem in terms of discharge stability, is generated from the phosphor layer. This is presumably because the phosphor layer is formed of phosphor particles, and a large amount of impurity gas has a large surface area. In order to effectively generate these gases from the phosphor layer in the aging step and allow the gases to be adsorbed by the impurity gas adsorption layer, it is effective to apply an AC voltage to the electrode (address electrode in the present embodiment) below the phosphor layer. It was a target. This is considered to be because the phosphor layer receives the impact of cations during discharge and efficiently discharges the impurity gas.

(Modification 1 of Embodiment) A modification 1 of the embodiment is shown in FIG.

In the present embodiment, the partition wall 20 is disposed in accordance with the gap between the address electrodes 19 adjacent to the upper surface of the dielectric layer 18 of the second plate, and the upper surface thereof is formed of an impurity gas made of a material thin film that adsorbs the impurity gas. An adsorption layer 21 is formed. The phosphor layers 22 to 24 corresponding to red (R), green (G), and blue (B) are formed on the upper surface.

In this case, the surface area of the impure gas adsorbing layer was increased as compared with the case where the impure gas adsorbing layer was formed on the lower surface of the partition wall, and a greater discharge stabilizing effect was obtained.

In the method of manufacturing a PDP according to the present embodiment, a partition 10 is formed on a back glass substrate on which a dielectric 18 has been formed, and an alkaline earth oxide of any of MgO, CaO, SrO, and BaO is formed on the surface. It can be obtained by forming an impurity gas adsorption layer composed of a thin material layer by a vapor deposition method, and applying a phosphor layer composed of phosphor particles on the upper surface thereof.

(Modification 2 of Embodiment) A modification 2 of the embodiment is shown in FIG.

In this embodiment, the partition wall 27 is provided in accordance with the gap between the address electrodes 26 adjacent to the upper surface of the dielectric layer 25 of the second plate. Is applied to form an impurity gas adsorption layer 28. The phosphor layers 29 to 31 corresponding to red (R), green (G), and blue (B) are formed on the upper surface.

In this case, since the impure gas adsorbing layer is composed of the impure gas adsorbing material particles, the surface area of the impure gas adsorbing layer is remarkably increased as compared with the case where the impure gas adsorbing layer is formed of a thin film.
A greater discharge stabilizing effect was obtained.

The particle filling rates of the impurity gas adsorption layer and the phosphor layer are set so that the impurity gas generated inside the discharge space reaches the impurity gas adsorption layer effectively and is sufficiently adsorbed. Is preferably lower than that of the impurity gas adsorption layer.

The above-mentioned filling rate can be realized by, for example, making the average particle diameter of the impurity gas adsorption layer smaller than the average particle diameter of the phosphor layer.

Further, in these embodiments, the material of the impurity gas adsorption layer is MgO, CaO, SrO, Ba.
Although any alkaline earth oxide material of O was used, a similar effect can be obtained by using a material capable of effectively adsorbing water vapor, carbon dioxide, or carbon monoxide generated in the panel. can get.

(Third Modification of the Embodiment) In this embodiment, the structure of the first plate and the second plate is the same as the conventional structure as shown in FIG. The material is characterized by being composed of a material that adsorbs impure gas. And on the upper surface, red (R), green (G),
Phosphor layers 22 to 24 corresponding to each of blue (B) are formed.

In this case, as in the other modified examples, the impurity gas generated by the discharge was adsorbed on the partition wall material, and the effect of stabilizing the discharge was obtained.

The partition structure of the present embodiment is such that MgO, CaO, SrO, B
aO or an alkaline earth oxide material thin film formed of any of aO and a glass material of MgO, CaO, Sr
The partition wall can be constituted by a material containing an alkaline earth oxide material of either O or BaO itself.

At the time of driving the PDP, as shown in FIG. 6, each driver and the panel driving circuit 90 are connected to the PDP and applied between the scanning electrode 91a and the address electrode 92 of the cell to be lit. After the address discharge is performed, a sustain voltage is applied by applying a pulse voltage between the display electrodes 91a and 91b. Then, the cell emits ultraviolet light in accordance with the discharge, and is converted into visible light by the phosphor layer. An image is displayed by lighting the cell in this manner.

[0065]

As is apparent from the above, according to the present invention, since the impure gas generated by the discharge is adsorbed on the impure gas adsorption layer, the discharge characteristics of the PDP can be stabilized.

[Brief description of the drawings]

FIG. 1 is a main configuration diagram of a PDP in an embodiment.

FIG. 2 is a view showing a manufacturing process of the PDP in the embodiment.

FIG. 3 is a perspective view of a PDP according to the present embodiment.

FIG. 4 is a main configuration diagram of a PDP according to a first modification of the present embodiment.

FIG. 5 is a main configuration diagram of a PDP according to a second modification of the present embodiment.

FIG. 6 is a diagram showing a PDP display device in which a driving circuit is connected to a PDP.

FIG. 7 is a schematic sectional view of a conventional AC surface discharge type plasma display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front glass substrate 2 Display electrode 3 Dielectric layer 4 Protective layer 5 Back glass substrate 6 Address electrode 7 Dielectric layer 8 Impurity gas adsorption layer 9 Partition wall 10 Phosphor layer (R) 11 Phosphor layer (G) 12 Phosphor layer (B)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideaki Yasui 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C012 AA09 BC03 PP08 VV02 5C028 FF16 5C040 FA01 FA04 GG10 HA08 KA04 MA17

Claims (20)

[Claims] 1. A plasma display panel having a discharge space filled with a gas medium formed between a first plate and a second plate having a pair of parallelly arranged phosphor layers or electrodes composed of at least phosphor particles. A plasma display panel, wherein an impurity gas adsorption layer made of a material that adsorbs an impurity gas is formed below the phosphor layer. 2. A discharge space in which a gas medium is sealed is formed between a pair of first plates having at least electrodes arranged in parallel and a second plate having at least partition walls and a phosphor layer made of phosphor particles. 2. The plasma display panel according to claim 1, wherein the second plate has a partition wall and a phosphor layer formed on at least an upper surface of the impurity gas adsorption layer. 3. 3. A discharge space in which a gas medium is sealed is formed between a pair of parallel first plates having at least electrodes and a second plate having at least partition walls and a phosphor layer composed of phosphor particles. The plasma display panel according to claim 1, wherein the second plate has an impurity gas adsorption layer formed on at least a surface of the partition wall, and a phosphor layer is formed on an upper surface of the impurity gas adsorption layer. 2. The plasma display panel according to 1. 4. The plasma display panel according to claim 1, wherein the impurity gas adsorption layer is formed of a thin film. 5. The plasma display panel according to claim 1, wherein the impurity gas adsorption layer is made of particles. 6. The plasma display panel according to claim 5, wherein the particle filling rate of the impurity gas adsorption layer is higher than the particle filling rate of the phosphor layer. 7. The method according to claim 5, wherein the average particle diameter of the impurity gas adsorption layer is smaller than the average particle diameter of the phosphor layer.
Or the plasma display panel according to 6. 8. A discharge space in which a gas medium is sealed is formed between a first plate and a second plate having a pair of parallelly arranged phosphor layers, at least phosphor particles, partitions or electrodes. A plasma display panel, wherein the partition wall is formed of a material that adsorbs an impurity gas. 9. The plasma display panel according to claim 1, wherein no phosphor layer is formed between continuous discharge cells of the same color. 10. The impurity gas-adsorbing layer is composed of MgO, CaO,
10. The plasma display panel according to claim 1, comprising an alkaline earth oxide material of SrO or BaO or a material containing said material. 11. A method for manufacturing a plasma display panel, comprising a step of forming a partition wall and a step of applying phosphor particles to form a phosphor layer after a step of forming an impure gas adsorption layer comprising a thin film. . 12. A method of manufacturing a plasma display panel, comprising a step of forming an impure gas adsorption layer made of a thin film and a step of applying phosphor particles to form a phosphor layer after the step of forming a partition wall. . 13. A step of forming particles of a material that adsorbs an impure gas by applying particles of an impurity gas-adsorbing layer and a step of applying phosphor particles to form a phosphor layer after the step of forming a partition wall. A method for manufacturing a plasma display panel. 14. The plasma according to claim 11, further comprising a heating step of heating the plate on which the phosphor layer is formed in a dry atmosphere after the step of forming the phosphor layer. Display panel manufacturing method. 15. A heating step of heating the plate on which the phosphor layer is formed in a dry atmosphere after the step of forming the phosphor layer, wherein the heating step to the sealing step are continuously performed in a dry atmosphere. The method for manufacturing a plasma display panel according to claim 14, wherein the method is performed. 16. The method according to claim 11, wherein the steps from the sealing step to the exhausting step are continuously performed in a dry atmosphere.
5. The method for manufacturing a plasma display panel according to any one of the above items 5. 17. The method according to claim 14, wherein a drying atmosphere in a heating step or a sealing step of the plate on which the phosphor layer is formed is an oxygen gas or a gas containing oxygen. A method for manufacturing a plasma display panel. 18. The method for manufacturing a plasma display panel according to claim 14, wherein the drying atmosphere is a gas atmosphere having a dew point of −20 ° C. or less. 19. An AC voltage is applied to an electrode below the phosphor layer in an aging step of applying a voltage between the electrodes and discharging for a predetermined time to stabilize the discharge voltage. 19. The method for manufacturing a plasma display panel according to any one of the above items. 20. A plasma display panel display device comprising a plasma display panel and a drive circuit for driving the plasma display panel, wherein the plasma display panel is any one of claims 1 to 10. A plasma display panel display device, characterized in that: