JP2002367537A - Display panel and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a panel structure reducing the time of each process and having good characteristics by enhancing the efficiency of evacuation during the process of evacuating the inside of a display panel. SOLUTION: A recessed part is provided in a portion of the top of each of barrier ribs formed inside the panel to enhance the efficiency of evacuating the inside of the panel during the process of evacuation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional plasma display panel will be described below with reference to the drawings. FIG. 1 is a sectional view schematically showing an alternating current (AC) type plasma display panel.

In FIG. 1, reference numeral 41 denotes a front glass substrate, on which a display electrode 42 is formed. Further, the display electrode 42 is covered with a dielectric layer 43 and a magnesium oxide (MgO) dielectric protection layer 44.

Reference numeral 45 denotes a rear glass substrate. On the rear glass substrate 45, address electrodes 46, partition walls 47, and phosphor layers (50 to 52) are provided.
Reference numeral 9 denotes a discharge space for filling a discharge gas. The phosphor layer has red 50, green 51, and blue 52 for color display.
Are arranged in order. Each of the phosphor layers (50 to 52) emits and emits light by vacuum ultraviolet rays (wavelength: 147 nm) having a short wavelength generated by discharge.

Further, as shown in FIG. 2, a panel structure in which each discharge space is made independent by partition walls 47a and 47b formed in a grid shape for the purpose of improving discharge efficiency and preventing discharge leakage to an adjacent discharge space. There is also.

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 Each color phosphor can be produced as follows.

Blue phosphor (BaMgAl ₁₀ O ₁₇ : Eu)
First, barium carbonate (BaCO ₃ ), magnesium carbonate (MgCO ₃ ), aluminum oxide (α-Al ₂ O ₃ )
Is blended so that the atomic ratio of Ba, Mg, and Al is 1: 1: 1: 10. Next, a predetermined amount of europium oxide (Eu ₂ O ₃ ) is added to the mixture.

Then, an appropriate amount of flux (AlF_Two, B
aCl_Two) Together with a ball mill, and
At 650 ° C. for a predetermined time (for example, 0.5 hour), in a reducing atmosphere
Ki (H _Two, N_TwoIt is obtained by firing in the middle).

The red phosphor (Y ₂ O ₃ : Eu) is blended with yttrium hydroxide Y ₂ (OH) ₃ and boric acid (H ₃ BO ₃ ) as raw materials so that the atomic ratio of Y and B is 1: 1. I do. Next, a predetermined amount of europium oxide (Eu) was added to the mixture.
₂ O ₃ ) is added, mixed with a suitable amount of flux using a ball mill, and fired in air at 1200 ° C. to 1450 ° C. for a predetermined time (for example, 1 hour).

The green phosphor (Zn ₂ SiO ₄ : Mn) is obtained by converting zinc oxide (ZnO) and silicon oxide (SiO ₂ ) into Z
It is blended so that the atomic ratio of n and Si is 2: 1. Next, a predetermined amount of manganese oxide (Mn ₂ O ₃ ) was added to the mixture, and the mixture was mixed in a ball mill.
C. for a predetermined time (for example, 0.5 hour).

The phosphor particles produced by the above-mentioned method are crushed and sieved to obtain a phosphor material having a predetermined particle size distribution.

Hereinafter, a conventional PDP manufacturing method will be described.

An address electrode made of silver is formed on a rear glass substrate, and a visible light reflecting layer made of dielectric glass and a glass partition are formed on the address electrode at a predetermined pitch.

A phosphor layer is formed by disposing a phosphor paste of each color including a red phosphor, a green phosphor, and a blue phosphor in each space interposed between these partition walls. The phosphor layer is baked to a degree to remove resin components and the like in the paste (phosphor baking step).

After firing the phosphor, a low-melting glass paste is applied around the back plate as a sealing material for sealing with the front plate,
The material is calcined at about 350 ° C. to remove resin components and the like in the low-melting glass paste (low-melting glass paste calcination step).

After that, the front plate on which the display electrode, the dielectric glass layer and the protective layer are sequentially formed, and the rear plate are arranged so as to face each other with the display electrode and the address electrode interposed at right angles via a partition wall, and baked at about 450 ° C. The surroundings are sealed with low melting point glass (sealing step).

Thereafter, the inside of the panel is evacuated by a vacuum pump or the like while heating to about 350 ° C. In addition, the inside of the panel is held in a vacuum state by starting the gas adsorption effect of the gas adsorbing member (exhaust step), and after the end, discharge is performed Gas is introduced at a predetermined pressure.

[0019]

As described above, in the conventional evacuation process, the inside of the panel is evacuated while being heated by a vacuum pump or the like using a temperature profile as shown in FIG. Since the discharge space in the panel is very finely divided by the partition walls, it usually takes about 6 to 24 hours to evacuate the inside of the panel to a predetermined degree of vacuum. This occupies a very large amount of time in the panel manufacturing process, and the effect of shortening the lead time and cost of the manufacturing process is expected by shortening this process. In addition, impurity gas remaining in the panel due to insufficient evacuation causes a reduction in discharge efficiency.

In view of the above, the present invention is directed to more efficiently evacuating the inside of the panel to such a problem, and is also applicable to the evacuating of a panel having a grid-shaped partition structure. An effective panel structure and a method for manufacturing the same are provided. Further, good display characteristics can be obtained by the panel according to the present invention.

[0021]

In order to achieve the above object, a display panel according to the present invention is provided with a recess at a part of the top of a partition wall formed in the panel, so as to reduce the evacuation efficiency in the panel during the evacuation step. It is characterized by improving.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a plasma display panel (PDP) according to an embodiment of the present invention will be described.

(First Embodiment) FIG. 4 is a sectional perspective view schematically showing an AC surface discharge type PDP according to an embodiment of the present invention.

This PDP has a front plate on which a display electrode 42, a dielectric layer 43 and a protective layer 44 are disposed on a front glass substrate 41, and an address electrode 46, a partition wall 47 and a phosphor layer 50 on a rear glass substrate 45. A discharge space 30 formed between the front plate and the back plate by laminating the back plate with
It has a configuration in which a discharge gas is sealed.

Partition walls 4 formed on rear glass substrate 45
Reference numeral 7 denotes a front glass substrate 41 opposed to the top.
It is configured so as to be in contact with the dielectric layer 43 formed thereon via the protective layer 44, and a concave portion 70 is arranged at a part of the contacting top.

The arrangement of the concave portions 70 will be described in detail with reference to FIG. 5 where the PDP is viewed from the display surface. If the concave portion 70 is arranged near the discharge region in the adjacent discharge space 30 partitioned by the partition wall 47, there is a possibility that discharge discharge or light emission of the phosphor 50 may leak at the time of discharge light emission of each cell. It is desirable to be arranged at a position between the electrodes 42.

The adjacent discharge space 30 is evacuated from the panel through the concave portion 70 disposed in the partition wall 47. In order to obtain the effect of improving the exhaust efficiency, the concave portion 70 has a thickness of 10 μm.
It is desirable to set the dent more than the extent.

Next, a manufacturing method for carrying out the present invention will be described.

If the partition wall 47 is formed by a printing method, the partition wall material need not be applied to the portion corresponding to the concave portion 70. When the partition wall 47 is formed by lamination printing using a plurality of printings, the number of times of printing is set so that the concave portion 70 has a predetermined thickness, and thereafter, the partition wall material other than the concave portion 70 is printed to form the concave portion. 70 is formed.

After forming the partition wall 47 by applying a photosensitive partition wall material, the concave portion 7 is formed by a photo method.
It is also possible to expose, develop and pattern 0.

Further, a sand blast method can be applied. A protective film in which a portion corresponding to the concave portion 70 is patterned is formed on the surface of the partition wall 47, and particles are sprayed on the partition wall 47 through the protective film to scrape off the portion corresponding to the concave portion 70. After that, the protection film is removed to form the recess 70.

(Second Embodiment) FIG. 6 shows a panel configuration according to a second embodiment. The difference from the first embodiment is that the partition wall 47 is formed in a grid shape to improve the discharge efficiency and prevent discharge leakage. In such a panel structure, since the discharge spaces are close to independent closed spaces, the exhaust efficiency is further deteriorated. Although a panel structure in which the height of the partition wall 47a is smaller than that of the partition wall 47b has been proposed for the purpose of improving the exhaust efficiency, the use of the present invention for such a panel as shown in FIG. Efficiency can be improved.

Referring to FIG. 7 where the PDP is viewed from the display surface, a portion where the concave portion 70 is arranged will be described. A partition 47a and a partition 47b are formed to separate adjacent discharge spaces. The recess 70 may be disposed at the intersection of the partition 47a and the partition 47b. However, since the height of one partition 47a is lower than that of the other partition 47b, the height of the partition 70 may be the same as that of the partition 47a. Absent.

(Third Embodiment) A concave portion may be formed on the front glass substrate 41 for the purpose of improving the exhaust efficiency. The above-described embodiment is characterized in that a concave portion is formed in the partition wall 47 on the rear glass substrate 45, but the concave portion is also formed on the front glass substrate 41 to further improve the exhaust efficiency of the panel. Can be improved. FIG. 8 or FIG. 9 shows an example of the third embodiment.

In the present case, the concave portion is described as a portion having a shape that is concave with respect to a peripheral portion. Therefore, it is apparent that the same effect can be obtained even for a panel structure in which the peripheral portion has a convex shape when viewed from the concave portion.

The present invention can be applied to a panel having a partition, and the exhaust efficiency in the panel can be improved.

Further, at the time of driving the PDP, as shown in FIG.
0 to connect the scanning electrode 10 of the cell to be turned on.
After applying an address discharge between the display electrodes 101a and 101b, a sustain voltage is applied by applying a pulse voltage between the display electrodes 101a and 101b. 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.

In the above embodiment, the surface discharge type PDP is exemplified.
For example, the present invention can be applied to all panels having partition walls.

[0039]

As described above, according to the present invention, it is possible to improve the exhaust efficiency of the panel during the exhaust process, to shorten the exhaust time, and to provide a panel having good display characteristics with less impurity gas remaining in the panel. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a schematic sectional perspective view of a conventional AC surface discharge type plasma display panel.

FIG. 2 is a schematic cross-sectional perspective view of another AC surface discharge type plasma display panel.

FIG. 3 is a diagram showing a profile in a conventional exhaust process.

FIG. 4 is a sectional perspective view of an AC surface discharge type plasma display panel according to the first embodiment of the present invention.

FIG. 5 is a diagram showing the first embodiment from a display surface.

FIG. 6 is a sectional perspective view of an AC surface discharge type plasma display panel according to a second embodiment of the present invention.

FIG. 7 is a diagram showing the second embodiment from the display surface.

FIG. 8 is a sectional perspective view of an AC surface discharge type plasma display panel according to a third embodiment of the present invention.

FIG. 9 is a sectional perspective view of an AC surface discharge type plasma display panel according to a third embodiment of the present invention.

FIG. 10 is a diagram showing a PDP display device in which a driving circuit is connected to the PDP of the present embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 30 discharge space 41 front glass substrate 42 display electrode 43 a, 43 b, 43 c, 43 d dielectric layer 44 protective layer 45 rear glass substrate 46 address electrode 47 a, 47 b partition wall 50 to 52 phosphor 70 recess

Continued on the front page (72) Inventor Kazuya Hasegawa 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshiki Sasaki 1006 Odaka Kadoma, Kadoma City Osaka Pref. Matsushita Electric Industrial Co., Ltd. Reference) 5C027 AA09 5C032 CC10 5C040 FA01 FA04 GB03 GB14 GF02 GF12 GF19

Claims (11)

[Claims] 1. A display panel, wherein a concave portion is provided on at least a part of a top of a partition formed on at least one of two substrates arranged opposite to each other. 2. The display panel according to claim 1, wherein the recess is disposed between adjacent discharge electrodes among a plurality of discharge electrodes formed on the other substrate. 3. The method according to claim 1, wherein the concave portion is formed in at least a part of the tops of the intersecting portions of the cross-shaped partition formed on at least one substrate. Display panel described. 4. A concave portion is provided on the surface of the counter substrate corresponding to the concave portion provided on the top of the partition wall.
4. The display panel according to any one of items 1 to 3. 5. The display panel according to claim 1, wherein the depth of the recess is at least 10 μm. 6. In a display panel in which a recess is provided in at least a part of a top of a partition formed on at least one of two substrates disposed opposite to each other, printing is performed on a portion other than the recess. Forming the concave portion by using the method described above. 7. In a display panel in which a recess is provided on at least a part of the top of a partition formed on at least one of two substrates disposed opposite to each other, the number of times of printing of the recess is set to a value other than that of the recess. A method of manufacturing a display panel, wherein the recess is formed by reducing the number of the recesses as compared with the portion. 8. A display panel in which a recess is provided in at least a part of the top of a partition formed on at least one of two substrates disposed opposite to each other, wherein the recess is formed by a photo method. A method for manufacturing a display panel, comprising: 9. A display panel in which a recess is provided in at least a part of the top of a partition formed on at least one of two substrates disposed opposite to each other, wherein the recess is formed by sandblasting. A method for manufacturing a display panel, comprising: 10. The display panel according to claim 1, wherein said display panel is a plasma display or a field emission display. 11. A display device comprising the display panel and a drive circuit for driving the display panel, wherein the display panel is the display panel according to claim 10.