JP2003178683A - Back plate and plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deletion of ribs and improve a brightness value of a plasma display panel (PDP). <P>SOLUTION: In a back plate 31 having a board 2, a plurality of ribs 3 formed on a surface of the board 2 and a fluorescent layer 6 laminated on an inner wall face 5 of a display cell 4 consisting the space between two adjacent ribs 3, a tip end part 3a of the rib 3 is formed on a convex curved surface 3b. Also in the back plate 31, the fluorescent layer 6 is laminated on the convex curved surface 3b so that the thickness of the fluorescent layer 6 is gradually decreased toward a peak part 3d. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back plate and a plasma display panel having the back plate.

[0002]

2. Description of the Related Art Generally, a plasma display panel (plasm) used in a thin large-screen color display device or the like.
ma display panel, hereinafter abbreviated as "PDP". ) Has a structure in which opposing electrodes are provided in a space surrounded by ribs (partition walls) called minute display cells, and dischargeable discharge gas such as rare gas is enclosed in the display cells. Plasma is generated between the electrodes by discharge, and the plasma causes the phosphor to emit light to display an image on the screen.

Conventionally, as shown in FIGS. 4 and 5,
In the PDP 51, a large number of ribs 53 are formed between electrodes 61 on one surface of a substrate 52 having electrodes 61, and each space between the ribs 53 is a display cell 54, and an inner wall surface 55 of the display cell 54.
A back plate 71 having a phosphor layer 56 formed on the
The front plate 58 is provided in contact with the front end surface 53b of the rib 53 of the rear plate 71, and the display cell 54 is filled with a discharge gas (not shown).

The shape of the ribs 53 on the rear plate 71 is such that the front end portions 53a of the ribs 53 are horizontally formed.
The side surface 53c of the rib 53 and the tip end surface 53b form a corner portion 53d that is substantially right angle. The rib 53 is formed by, for example, a sandblast method.

The electrodes 61 and 62 are arranged orthogonally to each other, and the display cell 54 between these electrodes 61 and 62 is arranged.
Plasma is generated in the interior by the discharge, and the phosphor layer 56 is caused to emit light by this plasma to display an image on the screen 58a of the front plate 58. Therefore, in the PDP 51,
It is essential to maintain the airtightness of the display cell 54,
Therefore, the rib 53 is required to be free from deformation and damage.

Further, as one of the methods for improving the brightness value of the displayed image without changing the distance between the ribs 53, 53, the space of the display cell 54 is expanded and the PDP 5 is used.
It is generally known that the formation area of the phosphor layer 56 viewed from above 1 is widened. In this PDP 51, the width of the rib 53 is narrowed, that is, the front end surface 53b.
The display cell 54 is enlarged by reducing the area of the display cell 54.

[0007]

However, in the above-mentioned rear plate 71, since the rib 53 has the shape having the corner portion 53d, the front plate 58 is sealed when the rear plate 71 and the front plate 58 are sealed. May press the tip end surface 53b of the rib 53, and the force of pressing the rib 53 downward may concentrate on the corner 53d of the rib 53, causing the corner 53d of the rib 53 to drop off so that the corner 53d may be dropped. There is also a possibility that the phosphor layer 56 laminated on the side surface 53c of the same may be missing.

Further, in the above PDP 51, the display cell 54 is enlarged by narrowing the width of the rib 53 in order to improve the luminance value. However, by narrowing the width of the rib 53, the rib 53 is made smaller. There is a problem that the strength is lowered and the rib 53 and the phosphor layer 56 are missing when the front plate 58 is pressed against the tip end surface 53b of the rib 53 to be joined. Further, since the side surface 53c near the corner portion 53d is formed almost vertically, the phosphor layer 5 formed in this portion.
No. 6 had a problem that, when the phosphor was applied, the phosphor was dripping downward and was difficult to adhere to the side surface 53c. Therefore, the PD by enlarging the space of the display cell 54
There is a problem that there is a limit to the improvement of the brightness value of P51.

The present invention has been made in view of the above-mentioned circumstances, and provides a back plate capable of preventing the rib from being omitted and improving the brightness value of the PDP, and a PDP having the back plate. Is intended.

[0010]

In order to solve the above problems, the present invention proposes the following means. The invention according to claim 1 is a rear plate including a substrate, a plurality of ribs formed on a surface of the substrate, and a phosphor layer laminated on an inner wall surface of a display cell forming a space between the ribs. There is proposed a back plate characterized in that the front end portion of the rib is formed in a convex curved surface.

In the back plate according to the present invention, since the tip end portion of the rib is formed in a convex curved surface, it is possible to prevent a defect such as a loss of the rib and the phosphor layer when manufacturing the plasma display panel. You can

According to a second aspect of the present invention, in the back plate according to the first aspect, the phosphor layer is laminated on the convex curved surface so that the thickness becomes gradually thinner toward the top thereof. Has proposed a back plate characterized by. In the back plate according to the present invention, since the phosphor layer is laminated on the convex curved surface, the phosphor layer can be reliably formed up to the vicinity of the top of the convex curved surface. It is possible to surely increase the area of the body layer.

The invention according to claim 3 proposes a plasma display panel comprising the back plate according to claim 1 or 2. In the plasma display panel according to the present invention, since the tip of the rib is formed in the convex curved surface, the area of the display cell can be easily expanded, and when the phosphor layer is laminated on the convex curved surface, The area of the phosphor layer that emits light can be increased.

[0014]

1 to 3 show an embodiment according to the present invention. As shown in FIGS. 1 and 2, a PDP (plasma display panel) according to this embodiment.
Reference numeral 1 denotes a substrate 2 having electrodes 11, a plurality of ribs 3 formed on the surface of the substrate 2, and a space formed between the ribs 3 as a display cell 4, and fluorescent light formed on an inner wall surface 5 of the display cell 4. The body layer 6 and the front plate 8 having the electrodes 15 are provided.

The substrate 2 has a structure in which a plurality of strip-shaped electrodes 11 are sandwiched between the glass substrate 9 and the dielectric layer 10 at a predetermined pitch, and the rib 3 is provided on the upper surface of the dielectric layer 10.
Are formed. The rib 3 is made of glass or so-called glass-ceramic in which ceramic particles are dispersed in the glass, and is formed between the electrodes 11. Also,
The tip 3a of the rib 3 is formed on the convex curved surface 3b.
The material of the dielectric layer 10 is almost the same as the material of the rib 3.

The phosphor layer 6 is R (red) G (green) B (blue)
The three primary color phosphors are sequentially and repeatedly formed on each inner wall surface 5, and when the electrodes 11 and 15 discharge the discharge gas in the display cell 4, the discharge gas ( (Not shown) emits light when excited by the ultraviolet rays emitted. The inner wall surface 5 on which the phosphor layer 6 is laminated has ribs 3
The surface 10a of the dielectric layer 10 exposed between the convex curved surface 3b, the side surface 3c, and each rib 3. The phosphor layer 6 is formed to have almost the same thickness on the front surface 10a and the side surface 3c, and is formed to be gradually thin toward the top portion 3d of the convex curved surface 3b. The substrate 2, ribs 3 and phosphor layer 6 constitute a back plate 31.

The front plate 8 comprises a glass substrate 12, a transparent dielectric layer 13 and a protective film 14 which are sequentially laminated to form a glass substrate 12.
A plurality of strip-shaped electrodes 15 are sandwiched between the transparent dielectric layer 13 and the transparent dielectric layer 13 at a predetermined pitch. Electrode 15
Is composed of a wide transparent electrode 15a made of, for example, ITO, and a bus electrode 15b made of, for example, Ag and complementing the conductivity of the transparent electrode 15a. In the front plate 8, since the glass substrate 12 has the display surface 12a for displaying an image, the display light generated by the phosphor layer 6 emits the display light.
The glass substrate 12, the transparent dielectric layer 13, the protective film 14, and the wide transparent electrode 15a are formed of a transparent member so as to pass through 2a, and the bus electrode 15b is provided to minimize the blocking of display light. Has a narrow shape.
The PDP 1 is configured by joining the front plate 8 to the front end portion 3a of the rear plate 31 so that the electrodes 11 and 15 are arranged in directions orthogonal to each other.

A method of manufacturing the PDP 1 having the above structure will be described. First, as shown in FIG. 1, electrodes 11 are arranged on a surface 9a of a glass substrate 9 at a predetermined pitch, and the electrodes 11 are covered with a dielectric layer 10 to form a substrate 2
To form. Next, as shown in FIG. 3, a ceramic paste is applied in a film form on the entire surface of the substrate 2 to form a paste film 21. Here, the rib 3 and the dielectric layer 10 are
Since the electrodes 11 are arranged on the glass substrate 9 since they are made of substantially the same material, the paste film 21 for simultaneously forming the ribs 3 and the dielectric layer 10 may be collectively coated on the upper surface thereof.

Then, the blade 22 having the same number of comb teeth 22a as the electrodes 11 is pierced into the paste film 21 and moved in the direction along the length direction of the surface of the substrate 2 and the electrodes 11 (direction B). Here, the blade 22 is connected to the paste film 2
When the rib 3 is formed after the dielectric layer 10 when piercing 1, the tip of the comb tooth 22a is pierced so as to abut the dielectric layer 10. When the rib 3 and the dielectric layer 10 are formed at the same time, the paste film 2 is formed so that the thickness of the paste film 21 for forming the dielectric layer 10 remains.
Pierce 1 Further, when the blade 22 is moved in the B direction, the comb tooth 22a always moves so as to pass above the electrode 11, and the portion of the paste film 21 contacting the comb tooth 22a is swept by the comb tooth 22a. Or move to the gap between the comb teeth 22a.

The paste film 21 moving in the gap between the comb teeth 22a is the paste film 21 located in the gap between the comb teeth 22a.
At the same time, the rib-like material 30 is formed on the surface of the substrate 2. Then, by drying and firing the rib-shaped material 30 for a predetermined time, as shown in FIG. 2, the tip portion 3a becomes the rib 3 having the convex curved surface 3b, and the convex curved surface 3b, the side surface 3c, and the rib 3 of the rib 3 are formed. A phosphor is applied to the surface 10a of the dielectric layer 10 between the third and third portions to form the phosphor layer 6.

Further, as shown in FIG. 1, the glass substrate 1
The electrodes 15 are arranged at a predetermined pitch on the back surface of the second display surface 12a, the electrodes 15 are covered with the transparent dielectric layer 13, and the protective film 14 is formed on the surface of the transparent dielectric layer 13. To get Finally, the back plate 31 and the front plate 8 are pressed and sealed so that the protective film 14 is in contact with the convex curved surface 3b of the rib 3 and the electrode 15 is arranged orthogonal to the electrode 11. To do.

As described above, according to the back plate 31,
Since the tip portion 3a of the rib 3 is formed on the convex curved surface 3b, when the front plate 8 is pressed against the top portion 3d of the rib 3, a force for dragging the tip portion 3a of the rib 3 downward is not generated, and the rib 3 3 and the phosphor layer 6 can be prevented from being defective. In addition, since the phosphor layer 6 is laminated on the convex curved surface 3b of the rib 3 formed into a smooth curved surface so that the thickness becomes gradually thinner toward the top portion 3d thereof, the convex curved surface 3b can be securely provided up to the vicinity of the top portion 3d. The phosphor layer 6 can be formed on the substrate. Therefore, the area of the phosphor layer 6 formed on the surface of the rib 3 can be surely increased,
The PDP 1 capable of improving the brightness value can be manufactured.

Further, according to this PDP 1, since the tip 3a of the rib 3 is formed on the convex curved surface 3b, the area of the display cell 4 can be easily enlarged without changing the pitch between the ribs 3 and 3. can do. Also, the convex curved surface 3b
Since the phosphor layer 6 is laminated on the above, it is possible to easily increase the area of the phosphor layer 6 that emits light. Therefore, it is possible to easily improve the luminance value of the PDP 1.

In the above embodiment, the paste film 21 is scraped off by the blade 22 to form the rib 3. However, the method for forming the rib 3 is not limited to this, and the tip portion 3a of the rib 3 is not limited to this. Any method can be used as long as it can form the convex curved surface 3b.

[0025]

As described above, according to the invention of claim 1, since the tip end portion of the rib is formed in the convex curved surface, the rib and the phosphor layer are not formed when the plasma display panel is manufactured. It is possible to prevent problems such as missing.

Further, according to the second aspect of the invention, since the phosphor layer is laminated on the smooth convex curved surface, the area of the phosphor layer formed on the surface of the rib can be surely increased. Therefore, it is possible to manufacture a plasma display panel capable of improving the brightness value.

Further, according to the invention of claim 3, since the tip of the rib is formed in a convex curved surface, the area of the display cell can be easily expanded, and the phosphor layer is laminated on the convex curved surface. In such a case, the area of the phosphor layer that emits light can be easily increased, and thus the brightness value of the plasma display panel can be easily improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a part of a PDP according to an embodiment of the present invention is cut away.

FIG. 2 is an enlarged cross-sectional view showing a main part of the PDP of FIG.

FIG. 3 is a schematic diagram showing a rib forming method in the PDP of FIG.

FIG. 4 is a perspective view showing a state in which a part of a conventional PDP is cut away.

5 is an enlarged cross-sectional view showing a main part of the PDP of FIG.

[Explanation of symbols]

1 PDP (plasma display panel) 2 substrates 3 ribs 3a tip 3b convex curved surface 3d top 4 display cells 5 inner wall surface 6 Phosphor layer 31 back plate

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryuji Uesugi             1002-14 Mukoyama, Naka-machi, Naka-gun, Ibaraki Prefecture             Naka Research Center, Research Institute, Terial Co., Ltd.             In the center (72) Inventor Yoshio Kanda             1002-14 Mukoyama, Naka-machi, Naka-gun, Ibaraki Prefecture             Naka Research Center, Research Institute, Terial Co., Ltd.             In the center F-term (reference) 5C040 FA01 GB03 GB14 GF12 GG02                       GG03                 5C058 AA11 AB01 BA05 BA30 BA32

Claims (3)

[Claims] 1. A back plate comprising a substrate, a plurality of ribs formed on a surface of the substrate, and a phosphor layer laminated on an inner wall surface of a display cell forming a space between the ribs, wherein the rib is provided. The back plate, wherein the front end portion of the back plate is formed into a convex curved surface. 2. The back plate according to claim 1, wherein the phosphor layer is laminated on the convex curved surface so as to be gradually thin toward the top thereof. 3. A plasma display panel, comprising the back plate according to claim 1 or 2.