JP2001283733A - Substrate for plasma display panel, plasma display panel and plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an improvement for a brightness of light displayed and a better white balance when lighting. SOLUTION: A neighboring first barrier wall 23W to which a blue phosphor 24B is affixed, is prepared with a material of higher light reflection efficiency than that for a second barrier wall 23B. On the other hand, the second barrier wall 23B that is held between a phosphor of high intensity 24G and 24R, is prepared by a material with a low efficiency of light reflection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (hereinafter, referred to as a PDP) used for a display device such as a color television or a display monitor for displaying characters and images. The present invention relates to a partition for forming a discharge cell for improving brightness of a color display PDP.

[0002]

2. Description of the Related Art In recent years, the technology for colorizing PDPs has advanced,
2. Description of the Related Art PDPs have attracted attention as devices capable of realizing large flat panel displays (FPDs) applied to color televisions, monitors for personal computers (PCs), and the like. Here, the PDP is a self-luminous display panel in which a pair of glass substrates are bonded together with a small gap therebetween and a discharge space is formed therein by sealing the periphery thereof. AC
There are two types, a drive type PDP and a DC drive type PDP. Hereinafter, the AC type PDP will be described.

In an AC surface discharge reflection type PDP which is a mainstream of the AC type PDPs, a discharge space is partitioned by stripe-shaped partition walls. In the elongated discharge space partitioned by the partition walls, three individually addressable discharge cells are provided.
Types of electrodes, and P for color display
In the DP, one pixel has three colors of blue (B), green (G), and red (R).
It consists of color discharge cells. Here, FIG.
Is an AC driven surface discharge reflective PD for general color display
FIG. 3 is an exploded perspective view showing one pixel of P.

In FIG. 5, an AC driven surface discharge reflection type PDP for color display includes a front panel FP and a rear panel RP.
And a combination thereof. In the front panel FP,
A pair of discharge electrodes (consisting of an X electrode and a Y electrode) 11 for generating a main discharge are formed on the inner surface of the front glass substrate 10 forming a main part so as to be linear and parallel to each other when viewed from a plane. In the first direction (direction parallel to the display line L) D
It is arranged along X. The discharge electrode 11 is formed of a transparent electrode, and a metal electrode (bus electrode) 12 for reducing the resistance value is formed on the X and Y electrodes of the discharge electrode 11. Then, the discharge electrode 11 and the metal electrode 12 are removed from the front glass substrate
Covered with a dielectric layer 13 formed on the inner surface of
Further, the surface of the dielectric layer 13 is made of, for example, magnesium oxide (M
gO).

On the other hand, an address electrode 21 is formed on the inner surface of a rear glass substrate 20, which is a main part of the rear panel RP, along a second direction DY so as to be three-dimensionally orthogonal to the discharge electrodes X and Y. And each of the address electrodes 21
Except for the extraction terminal portion, it is covered with the insulating layer 22. Further, a stripe-shaped partition wall 23 having a uniform width over the whole so as to sandwich each address electrode 21.
Are formed to extend in the second direction DY. Furthermore, on the inner surface (bottom surface and side surface) of the gap sandwiched by the partition walls 23,
Phosphors 24B, 24G, and 24R of three colors (blue, green, and red) are regularly applied. Then, the phosphors 24B, 24
G and 24R are excited by ultraviolet rays (UV) generated by the discharge, and emit blue, green and red light, respectively.

One pixel for display is composed of three discharge cells arranged in the direction of the display line L corresponding to each discharge electrode pair 11, that is, blue, green and red discharge cells.

[0007]

SUMMARY OF THE INVENTION Conventional color display P
One of the technical issues of DP is to improve luminance. In the PDP, a phosphor is applied to the entire inner surface of the partition wall in order to improve the luminance by setting the light emitting area in the minute discharge cells as large as possible. However, there is still a need for further improvement in light emission luminance.

However, the luminous efficiency and the maximum luminance of the blue, green, and red phosphors are not actually uniform, and the luminous efficiency and the like of the blue phosphor are particularly different from those of the phosphors of other colors. When the phosphors of each color are excited by the same amount of ultraviolet rays generated by the discharge of the same intensity (when the sustain discharge voltages of the discharge cells of the respective colors are equalized), a specific color, ie, blue, is used. And the color balance is lost, resulting in a reduction in display quality. In other words, the conventional color display P
In the DP, when an attempt is made to increase the emission luminance of the display light while maintaining the balance of each color in white light (while maintaining the white temperature), it is applied to the discharge cells of blue, green and red, respectively. Even if the sustain discharge voltage is increased at the same rate,
It is difficult to increase the emission luminance of each color emitted from the phosphor at the same ratio for each color phosphor. For example, among the currently available phosphors, the maximum emission luminance of the blue phosphor is 60% higher than that of the green and red phosphors.
Since it is about 70% lower, the emission luminance of the display light in the entire panel depends on the degree of increase in the emission luminance of the blue phosphor itself in consideration of the optimum mixing ratio at the time of white light emission by three-color synthesis.

On the other hand, the white balance is changed by increasing only the emission luminance of the phosphor itself that emits a specific color, ie, blue (increasing the sustain discharge voltage applied to the blue discharge cell), thereby changing the white balance. When the color is to be emphasized (when a bluish white light is realized), there is also a problem that the color balance can be changed only within a range in which the emission luminance of the phosphor itself that emits the color increases.

[0010] Such a problem is not a problem peculiar to the AC surface discharge reflection type PDP having the structure as illustrated in FIG. 5, but is an AC3 electrode type PDP of another structure, an AC2 electrode facing discharge type PDP or the like. , DC-driven type having cell structure partition walls
DP can also occur.

The present invention has been made in view of such circumstances, and can improve emission luminance of display light emitted from the display side panel while maintaining white balance, and can reduce emission luminance of display light. It is an object of the present invention to provide a PDP capable of changing a white balance over a wider range without lowering it and a PDP substrate therefor.

[0012]

The invention according to claim 1 is
A substrate main body, a plurality of partition walls formed on the surface of the substrate main body, and a portion of the plurality of partition walls on a side surface of an adjacent partition wall and on a portion in the surface of the substrate main body sandwiched between the adjacent partition walls. Blue,
A phosphor group that is repeatedly attached in the order that phosphors of colors other than the blue phosphor are located between adjacent blue phosphors in which three types of phosphors that emit green and red light are adjacent to each other. In the plurality of partitions, one of the adjacent partitions provided with the blue phosphor is provided with a phosphor of the color other than the blue phosphor on one side surface and the other side surface thereof. Is characterized in that it is made of a material having a higher light reflection efficiency than the material constituting the partition.

The invention according to claim 2 is the plasma display panel substrate according to claim 1, wherein the other of the adjacent partitions provided with the blue phosphor is also other than the blue phosphor. Wherein the light-reflecting material is made of a material having a higher light reflection efficiency than the material forming the partition wall provided with the phosphor of the above color.

A third aspect of the present invention is characterized in that the substrate according to the first or second aspect is provided as one of a pair of panels.

A fourth aspect of the present invention is characterized in that the plasma display panel according to the third aspect has a display panel.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS This embodiment is characterized by the structure of one of a pair of panels constituting a PDP (for example, a back panel or a back substrate), particularly the structure of a partition.
That is, the PD according to the present embodiment that forms a non-display unit side panel
In the substrate for P, at least one of adjacent partitions (first partition) having a blue phosphor on one side surface among a plurality of partition walls formed on the surface of the substrate main body is disposed on both side surfaces. It is made of a first material having a higher light reflection efficiency than the light reflection efficiency of a second material forming a partition (second partition) provided with a phosphor of a color other than the blue phosphor.
In particular, if the second partition has a very low light reflection efficiency,
Alternatively, when the light reflection efficiency is made of a material almost close to zero, the effect of the present embodiment is further enhanced. In the following, the features of the present embodiment will be specifically described using an AC3 electrode surface discharge reflection type PDP as an example, and then various modifications will be described.

(Embodiment 1) FIG. 1 is a vertical sectional view showing a partial shape of an AC surface discharge reflection type PDP according to the present embodiment, and a pair of discharge electrodes (X, This corresponds to a longitudinal sectional view when a portion where the Y electrode is not formed is cut. FIG. 2 is a process diagram showing the formation of the partition walls.

In the PDP shown in FIG. 1, the conventional PD shown in FIG.
Similarly to P, a front panel (also referred to as a front substrate) and a rear panel (also referred to as a rear substrate) are bonded to face each other with a predetermined gap. Among them, the configuration of the front panel is the same as that of the front panel FP shown in FIG. 5, and the configuration of the rear panel is different. Therefore, the configuration of the rear panel will be mainly described below.

A substrate body 200, which is a main part of the rear panel (rear substrate), includes a rear glass substrate 20, address electrodes 21 formed on the inner surface (front surface) of the substrate 20, and a terminal for taking out each address electrode 21. An insulating layer 22 formed on the inner surface of the substrate 20 so as to cover a portion other than the portion
Consisting of Each address electrode 21 is disposed on the surface 200S of the substrate body 200 corresponding to the surface of the insulating layer 22.
A plurality of partition walls 23 extending in the second direction DY are provided in such a manner as to sandwich the. In addition, the top 23 of each partition 23
T is in contact with the surface of the protective film 14. Then, on the side surfaces S1 and S2 of the adjacent partition wall 23 and in the surface 200S,
Each of the phosphor forming regions including the portion 200S1 sandwiched between the adjacent partition walls 23 has blue (B),
The phosphors emitting green (G) and red (R) light, ie, 3
In the order in which the phosphors 24B, 24G, and 24R are arranged such that phosphors of colors other than the blue phosphor 24B are located between the adjacent blue phosphors 24B, here, the blue phosphor 24B, the green phosphor 24G, and the red phosphor The phosphors are regularly provided repeatedly in the order of 24R to form a phosphor group.

In the present embodiment, a plurality of partition walls 2
3, a first partition wall 23 adjacent to each other and having a blue phosphor 24B attached to one or the other side surface S1, S2 thereof.
W is made of a material having a higher light reflection efficiency than the material of the second partition 23B described later. For example, the first partition 23W is
It is composed of a partition wall material obtained by mixing a large amount of titania (TiO ₂ ) powder into a glass material as a main component, and becomes a whiter partition wall. In contrast, both phosphors 24G, 2
The partition 23 sandwiched between the 4Rs, that is, the second partition 23B having the green phosphor 24G and the red phosphor 24R attached on one side surface S1 and the other side surface S2, respectively, is a first partition wall 23B.
It is made of a material having a lower light reflection efficiency than that of the partition wall material. For example, the second partition wall 23B is made of a partition wall material formed by mixing powder of Cr or Cu into a glass material as a main component. In this case, by adjusting the mixing amount of the powder of Cr or Cu, the second partition wall 23B is formed as a blacker partition wall.
The (visible) light reflection efficiency can be further reduced, that is, the light reflection efficiency can be controlled to be very small or almost zero. Alternatively, the first partition wall 23W may have a relatively large amount of titania or Cr or Cu mixed in the main glass component, and the second partition wall 23B may have a relatively small amount of the above-described mixed amount. good. Alternatively, the partition wall 23 formed by mixing titania in the glass material may be configured as the first partition wall 23W, and the partition wall 23 formed of the glass material may be configured as the second partition wall 23B.

Next, a method of forming the first and second partition walls 23W and 23B will be described. The best method for forming the group of the partition walls 23 is a method of forming a partition wall material using a photoengraving process. Hereinafter, the forming method will be described with reference to the process chart of FIG.

First, the write electrode and the insulating layer (both not shown in FIG. 2) are formed on the inner surface of the rear glass substrate.
Is prepared, and then the photosensitive resin 30 is formed into a layer having a certain thickness.
0 (FIG. 2A). Next, among the three color phosphors, a discharge gap or a blue phosphor formation region where a blue phosphor having the lowest emission luminance is to be provided is defined (defined).
The first partition forming buried groove 31 is formed in the resin 30 by a photoengraving process (FIG. 2B). Thereafter, a partition material 32 containing a large amount of fine powder having excellent light reflection efficiency, such as titania, is filled or embedded in the groove 31 by, for example, a coater method, and the material 32 is dried (FIG. 2C). Then, FIG. 2 (b) shows a second partition wall burying groove 31A for forming (defining) discharge gaps in which green and red phosphors having higher emission luminance than the blue phosphor are to be provided. It is provided in the same manner as in the case (FIG. 2D). After that, the partition wall material 33 containing fine powder which lowers the reflection efficiency, such as Cr or Cu, or contains only a small amount of fine powder having excellent light reflection efficiency, such as titania, or which is made only of glass and does not contain fine powder is embedded. Dry (FIG. 2 (e)). Next, after removing the photosensitive resin 30 by a method such as etching, the partition is baked to form the first and second partitions 23W and 23B (FIG. 2 (f)). Finally, a blue phosphor 24B is provided in a blue phosphor forming region between the first partition walls 23W, and a green phosphor 24G and a red phosphor 24R are provided between the first partition wall 23W and the second partition wall 23B.
Is completed to complete the back substrate for PDP (FIG. 2 (g)).

According to the present embodiment, the first partition wall 23W adjacent to the blue phosphor 24B having the weakest light emission luminance is formed of the partition wall material having high light reflection efficiency. The brightness of the blue light emitted from the body 24B and emitted from the surface (display surface) of the front glass substrate
Can be improved in accordance with the increase in the light reflection efficiency of the light. On the other hand, for each of the red and green phosphors 24R and 24G, which originally have a strong light emission luminance, one of the two partition walls 23 adjacent to the phosphor has one of the high reflection efficiency partition walls 2.
3W, and the other partition 23 is a low reflection efficiency partition 23
Since it is composed of B, the luminance of red or green light emitted from the red or green phosphor and reflected on the side wall of the partition wall and emitted from the display surface is not increased or suppressed. Therefore, in the present embodiment, the luminance difference between the red or green emitted light and the blue emitted light is sufficiently smaller than when all the partition walls are made of the same material.

(Modification of First Embodiment) (1) In FIG. 1, a substrate body 200 of a rear substrate mainly includes a rear glass substrate 20 and an insulating layer 22, but has an AC surface having no insulating layer 22. The present invention can be applied to a discharge reflection type PDP. One such example is shown in the longitudinal section of FIG. The difference between FIGS. 1 and 3 is that
00, and in the case of FIG.
It comprises a back glass substrate 20 and address electrodes 21 formed on the surface of the substrate 20. It is a matter of course that the same operation and effects as those of the first embodiment can be obtained in this modification.

(2) In FIG. 1, the phosphor group is formed by translationally repeating an array of blue, green, and red phosphors 24B, 24G, and 24R in this order. Is not limited to this. That is, the red, blue, and green phosphors 24R, 24R
Even when a phosphor group is formed by folding an array having the order of B and 24G, or an array having the order of green, blue and red phosphors 24G, 24B and 24R in the first direction DX, the present invention is also applicable. The invention can be applied. One example is shown in the longitudinal sectional view of FIG. 4 is the PD shown in FIG.
The only difference from P is in the arrangement of the phosphor group. In the case of FIG. 4, a phosphor of either one of red and green is provided between the blue phosphors 24B. A red phosphor 24R or a green phosphor 24G is additionally provided on the first and second side surfaces S1 and S2 of the partition wall 23B.

It is apparent that this modification also has the same operation and effect as the first embodiment.

This modification can be applied to the modification (1) described above.

(3) In the first embodiment, the blue phosphor 24
Although the two first partition walls 23W adjacent to B are both formed of the high reflection efficiency partition wall material, only one of the adjacent first partition walls 23W is formed of the high reflection efficiency partition wall material. Is also good. In this case as well, although the function and effect are halved as compared with the first embodiment, it is possible to increase the brightness of the blue light emitted from the blue phosphor 24B and reflected and emitted from the display surface.

(4) In the first embodiment, the partition 23
The case where titania (TiO ₂ ) is used as an example of a material for improving the light reflection efficiency of the first partition wall 23 is described.
The material constituting W is not limited to this, but may be any material that can increase the light reflection efficiency. For example, a white powder such as zirconia can be used as the first partition wall constituent material.

The low-reflection material or non-reflection material forming the second partition 23B is not limited to Cr or Cu.

(5) In the first embodiment, the color display A
Although the C-drive surface discharge reflection type PDP is taken as an example, the present invention is not limited to this, and can be applied to any type of PDP including a reflection type and a transmission type for color display. . For example, another configuration of the AC 3-electrode type PDP, the discharge type PDP opposite to the AC 2-electrode, and the DC drive type PDP
The present invention can be applied to DP. In short, the present invention can be applied to any PDP substrate having a plurality of partitions for forming a discharge space on the surface of the substrate body.

(Supplementary Note) By incorporating the PDP described in the first embodiment and its various modifications together with its drive circuit and the like in a housing, a flat panel display device that can be used for a color television, a PC monitor, or the like is realized. It is possible to

[0033]

According to the first to fourth aspects of the present invention, when the PDP substrate is used as one panel of the PDP, the luminous luminance of the green or red phosphor having high luminous luminance by itself is reduced. Since the luminance of blue light emitted from the blue phosphor having the lowest emission luminance and reflected from the side surfaces of the partition walls and emitted from the display portion can be increased, the white balance is maintained, and The emission luminance of the emitted display light can be improved. in addition,
According to each invention, without lowering the emission luminance of the display light,
The amount of change in white balance can be increased. In other words, it becomes possible to further enhance blue light in white light.

[Brief description of the drawings]

FIG. 1 is an AC surface discharge reflection type PDP according to a first embodiment.
FIG.

FIG. 2 is a longitudinal sectional view showing a process for forming the back substrate for PDP according to the first embodiment.

FIG. 3 is a longitudinal sectional view showing an AC surface discharge reflection type PDP according to a modification of the first embodiment.

FIG. 4 is a longitudinal sectional view showing an AC surface discharge reflection type PDP according to a modification of the first embodiment.

FIG. 5 is an exploded perspective view showing a schematic configuration of one pixel of an AC drive surface discharge radiation type PDP.

[Explanation of symbols]

Reference Signs List 10 front glass substrate, 11 transparent electrode, 12 metal electrode, 13 dielectric, 14 protective film, 20 rear glass substrate, 21 writing electrode, 22 insulating layer, 23 partition, 2
3W first partition, 23B second partition, 24B blue phosphor, 24G green phosphor, 24R red phosphor, 30 photosensitive resin, 31 first partition forming groove, 31A second partition forming groove, 32 high reflection partition Material, 33 low reflection partition material,
200 board body, FP front panel (front board), R
P Back panel (back substrate).

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Manabu Akiha 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Chika Yano 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F term in Ryo Denki Co., Ltd. (reference) 5C040 GF02 GF18 GF19 JA20 KA04 KA07 KB03 KB15 KB19 LA11 MA02 MA03

Claims (4)

[Claims] 1. A substrate main body; a plurality of partition walls formed on a surface of the substrate main body; and a plurality of partition walls formed on a side surface of an adjacent partition wall among the plurality of partition walls. In each phosphor forming region consisting of a part on the surface and three kinds of phosphors emitting blue, green and red, phosphors of colors other than the blue phosphor are interposed between adjacent blue phosphors. And a phosphor group that is repeatedly attached in the order of being located, wherein, among the plurality of partitions, one of the adjacent partitions provided with the blue phosphor is on one side surface and the other. A substrate for a plasma display panel, characterized in that the substrate is made of a material having a higher light reflection efficiency than a material constituting a partition having a phosphor of the color other than the blue phosphor on the side surface of the phosphor. 2. The substrate for a plasma display panel according to claim 1, wherein the other of the adjacent partition walls provided with the blue phosphor is also a phosphor of the color other than the blue phosphor. A substrate for a plasma display panel, wherein the substrate is made of a material having a higher light reflection efficiency than the material forming the partition wall provided with. 3. A panel comprising the substrate according to claim 1 or 2 as one of a pair of panels.
Plasma display panel. 4. A plasma display device comprising the plasma display panel according to claim 3 as a display panel.