JP3126989B2 - Method for manufacturing plasma display panel - Google Patents

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 (PDP) capable of displaying various colors by providing a phosphor of a predetermined emission color.

2. Description of the Related Art Along with colorization of a PDP display, the visibility of a display screen has been improved. Further, simplification of the production and improvement of the yield are desired.

[0003]

2. Description of the Related Art A matrix display type P that displays characters and figures by combining dots (pixels) to emit light is used.
In the DP, a pair of glass substrates on a display surface side and a rear surface side are disposed to face each other with a discharge space provided, and each discharge cell defined at or near each intersection of an electrode group arranged in a grid is selectively discharged. It is configured to be.

Conventionally, in an AC (alternating current) drive type PDP in which an electrode for discharge is covered with a dielectric layer, a color other than the emission color of the discharge gas can be displayed by providing a phosphor which emits light by discharge. A surface discharge type PDP is known.

Generally, in a surface discharge type PDP, a phosphor is provided on the back side of the discharge space (that is, on the inner surface of the glass substrate on the back side) in order to increase the brightness of display. And, in order to reduce the ion bombardment of this phosphor at the time of discharge,
A plurality of discharge sustaining electrode pairs for generating a discharge are provided on the glass substrate on the display surface side.

An address electrode for selecting a display dot is provided on the glass substrate on the display surface side or the rear surface side so as to face each of the discharge sustaining electrode pairs in a grid pattern.

[0007]

As a phosphor, generally, (Y, Gd) BO ₃ : Eu ³⁺ having a red emission color, BaAl ₁₂ O ₁₉ : Mn having a green emission color, and a blue emission color. Ba
MgAl ₁₄ O ₂₃ : Eu ²⁺ or the like is used. These phosphors emit light when excited by ultraviolet rays generated at the time of discharge.

However, in the conventional PDP, since the phosphor at the time of non-light emission has a whitish color such as white or light gray, the contrast between the display dots during light emission and the non-display dots not emitting light is high. However, there is a problem that it is unclear and disadvantageous in viewability of display.

In order to solve such a problem, it is conceivable to provide a color filter corresponding to the emission color of the fluorescent material on the outer surface of the glass substrate on the display surface side by applying a translucent paint or the like.

[0010] However, in the final stage of PDP production, that is, after two glass substrates are superimposed, it is extremely difficult to apply a paint corresponding to minute dots. Also, if a paint for a color filter is previously applied to a glass substrate on the display surface side by a screen printing method or the like in an early stage of PDP production, the paint may peel off during heat treatment for forming electrodes and dielectrics. Therefore, the production yield may be reduced.

In view of the above problems, an object of the present invention is to manufacture a plasma display panel which enables clear color display by increasing the contrast and has stable display.

[0012]

According to the manufacturing method of the present invention, as shown in FIGS. 1 and 2, a pair of substrates 11 and 21 on a display surface side and a rear surface side are opposed to each other. A plurality of phosphors 28 having different emission colors are provided in the gap.
A method of manufacturing the plasma display panel 1 having R, 28G, and 28B, wherein each of the phosphors 28R, 28G,
Providing a coloring material 40R, 40G, 40B corresponding to the emission color of each of the phosphors 28R, 28G, 28B in each of the regions facing the respective 28B, and the coloring materials 40R, 40G, 40B. And a low melting point glass paste layer 17a that uniformly covers the surface of the substrate 11 on the display surface side
And a step of integrating the low-melting glass paste layer 17a and each of the coloring materials 40R, 40G, and 40B by heat treatment, and coloring the dielectric layers 17R, 17G, and coloring with the coloring materials 40R, 40G, and 40B. 17B.

[0013]

The colorant 40 provided on the substrate 11 on the display surface side
R, 40G, and 40B are low melting point glass paste layers 17a.
Covered uniformly by

The low melting glass paste layer 17a is fired by heat treatment. At this time, the coloring materials 40R, 40G, and 40B are diffused into the molten low-melting glass paste layer 17a, and the colored dielectric layers 17R, 17G, and 17B colored according to the emission colors of the phosphors 28R, 28G, and 28B are formed. It is formed.

The surfaces of the colored dielectric layers 17R, 17G, and 17B are continuous with each other and have flat surfaces without boundaries. That is, there is no step between the surfaces of the colored dielectric layers 17R, 17G, 17B. Therefore, when the PDP 1 is completed, the size of the discharge gap in each unit light emitting region becomes uniform, and a stable display screen without variation in discharge characteristics can be obtained.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional view showing the structure of the PDP 1 according to the present invention, and FIG. 2 is an exploded perspective view schematically showing a main part of the PDP 1 of FIG.

In FIGS. 1 and 2, the PDP 1 is a surface discharge type PDP in which a glass substrate 11 on the display surface side and a glass substrate 21 on the back side are provided to face each other with a discharge space 30 provided.

On the inner surface of the glass substrate 21 on the back side, there are provided strip-shaped partitions 29 extending in the vertical direction (the direction of the front and back of the sheet of FIG. 1) in order to divide the discharge space 30 into unit light emitting areas. Further, the address electrodes 22 are formed along the partition walls 29.
Are provided, and phosphors 28R, 28G, and 28B are provided between each address electrode 22 and each partition wall 29.

On the inner surface of the glass substrate 11 on the display surface side, a pair of discharge sustaining electrodes 1 comprising a pair of main discharge electrodes 13 and 14 is provided.
2. A metal electrode (bus electrode) 15 for supplementing the conductivity of the main discharge electrodes 13 and 14, and emission colors R (red) and G of the phosphors 28R, 28G and 28B facing each other via the discharge space 30.
(Green), colored dielectric layer 17 colored according to B (blue)
R, 17G, 17B, and a grid-like partition wall 19 are provided.

A discharge gas in which, for example, a mixture of neon and xenon is filled is sealed in the internal discharge space 30, and the upper surface of the glass substrate 11 becomes a display surface H.

The discharge sustaining electrode pair 12 is a transparent electrode for increasing the display brightness, and each of the colored dielectric layers 17R, 17G, 17B is covered with a protective film (not shown) made of MgO. .

When displaying the PDP 1 configured as described above, for example, first, the main discharge electrode 13 and the main discharge electrode 1 are displayed.
Then, a voltage exceeding the discharge starting voltage is applied between the first and fourth lines to start discharging in line units. Next, for each line,
A discharge erasing pulse (writing pulse) is applied to the address electrode 22 corresponding to a dot unnecessary for display, and the wall charges accumulated in the colored dielectric layers 17R, 17G, 17B are erased to stop the discharge.

A discharge sustaining voltage having a peak value lower than the discharge starting voltage is applied to the discharge sustaining electrode pair 12, and the discharge of the display dots is continued. Thereby, each phosphor 28R, 28
G and 28B are excited by ultraviolet rays generated by the discharge to emit light.

The colored dielectric layers 17R, 17G, 17B are
Since the light in the wavelength range corresponding to the emission colors of the phosphors 28R, 28G, and 28B is selectively transmitted, the display surface H
In areas (display dots) corresponding to the phosphors 28R, 28G, and 28B that are emitting light, the phosphors 28R, 28G, and 28B
A display color corresponding to the emission color of 28B appears.

In the areas (non-display dots) corresponding to the phosphors 28R, 28G, 28B on the display surface H which do not emit light, the colors of the colored dielectric layers 17R, 17G, 17B appear, and the phosphors 28R, 28G , 28B themselves become darker than in the case where the non-emission color appears.

Therefore, in the PDP 1, the contrast between the display dots and the non-display dots becomes clear,
Clear display becomes possible. Further, if the partition wall 19 is dark, crosstalk between adjacent unit light emitting regions can be suppressed, and the display quality can be further improved.

Next, a method of manufacturing the PDP 1 will be described.

FIGS. 1A to 1F show a PDP according to the present invention.
FIG. 3 is a partial cross-sectional view showing each manufacturing step of No. 1.

First, a discharge sustaining electrode pair 12 made of a transparent conductive film such as a Nesa film (tin oxide film) is formed on the surface of the glass substrate 11 on the display surface side by a thin film method [FIG.
(A)]. Thereafter, a bus electrode 15 (see FIG. 2) obtained by patterning a metal film having a three-layer structure of, for example, chromium-copper-chromium is superimposed on the discharge sustaining electrode pair 12, but FIG. Is omitted.

Next, three types of coloring materials obtained by mixing a pigment of each color corresponding to the emission colors R, G, and B of the phosphors 28R, 28G, and 28B, an organic solvent, and a small amount of a resin component (such as ethyl cellulose). 40R, 40G, and 40B are sequentially applied in a predetermined pattern by a screen printing method [FIG.
(B) to FIG. 1 (d)]. At this time, each coloring material 40R, 4
Since 0G and 40B may be separated from each other by about the width of the partition wall 19, the alignment of the coloring materials 40R, 40G and 40B is easy.

Here, as the pigment of R, cadmium
(Between cadmium sulfide and cadmium selenide crystals)
Solid solution) or molybdenum red (lead molybdate,
Using a solid solution of lead romate and lead sulfate) as a G pigment
Chrome green (Cr _TwoO_Three ) Or viridian
[Cr_TwoO (OH)_FourOr Cr_FourO_Three(OH)₆〕Such
Can be used. Also, as the pigment of B, ultramarine blue
(Sulfur-containing sodium aluminosilicate), or
Using navy blue [ferrocyanide (III)] etc.
Can be.

Subsequently, each coloring material 40R, 40G, 40B
In order to uniformly cover the surface of the glass substrate 11 including, for example, a low melting glass powder such as lead glass, a filler (adhesive),
Then, a low-melting glass paste obtained by mixing a low-melting glass paste with an organic solvent is applied and dried to form a low-melting glass paste layer 17 (FIG. 1E).

Then, the glass substrate 11 is placed in a normal atmospheric pressure atmosphere at a temperature (550) higher than the transition temperature of the low melting point glass.
To 580 ° C.), maintain the temperature for 60 to 90 minutes, and then naturally cool to room temperature. By this heat treatment, the organic solvent and the like evaporate to vitrify the glass paste layer 17, and at this time, the glass layer is colored at predetermined portions by the diffusion of the pigment, and the translucent colored dielectric layers 17R, 17G, and 1 are formed.
7B is formed [FIG. 1 (f)].

Thereafter, the colored dielectric layers 17R, 17G, 1
A partition wall 19 made of low-melting glass mixed with a black pigment is provided on 7B, and a protective film for protecting the colored dielectric layers 17R, 17G, 17B and lowering the firing voltage is deposited.

Finally, the glass substrate 1 having undergone the above steps is
1 and a glass substrate 21 provided with an address electrode 22, a partition 29, and phosphors 28R, 28G, 28B separately.
The colors of the colored dielectric layers 17R, 17G, and 17B and the emission colors R, G, and B of the phosphors 28R, 28G, and 28B are overlapped so as to correspond to each other, sealed with sealing glass, and mixed into the discharge space 30. The PDP 1 is completed by filling a gas or the like.

According to the above-described embodiment, the colored dielectric layer 17
Since R, 17G and 17B are formed at a stage before the two glass substrates 11 and 21 are overlapped, the phosphor 28
A color filter for preventing the non-light emitting colors of R, 28G, and 28B from appearing on the display surface H can be easily provided with high precision by using a screen printing method.

Further, the colored dielectric layers 17R, 17G, 17
B can be formed by sequentially applying and baking a low-melting glass paste mixed with a predetermined pigment, but in this case, each colored dielectric layer 17R, 1
Steps may be generated on the surfaces of 7G and 17B. In that regard, according to the above-described embodiment, each colored dielectric layer 17R, 1
Since the surfaces of 7G and 17B are continuous flat surfaces, the dimensions of the discharge gap in each unit light emitting region surrounded by the partitions 19 and 29 become uniform over the entire display surface H when the PDP 1 is completed. A PDP 1 with stable display without variation in discharge characteristics can be obtained.

In the above-described embodiment, each colorant 40R,
40G and 40B can be provided in a predetermined arrangement pattern by photolithography.

In the above embodiment, the phosphors 28R, 2R
The emission colors of 8G and 28B and the corresponding pigments for coloring can be selected according to the use of the PDP 1 or the like. Also, the arrangement and shape of the phosphors 28R, 28G, 28B and the corresponding colored dielectric layers 17R, 17G, 17B can be changed as appropriate.

In the above-described embodiment, the method of manufacturing the PDP 1 having the three kinds of phosphors 28R, 28G, and 28B corresponding to the three emission colors is exemplified. However, two kinds of phosphors can be used. .

In the above embodiment, the phosphors 28R,
Although 28G and 28B are provided on the glass substrate 21 on the back side, the phosphors 28R, 28G and 28B may be provided on the glass substrate 11 on the display surface side. In this case, the colored dielectric layers 17R, 17G, and 17B are provided between the glass substrate 11 and the phosphors 28R, 28G, and 28B, and do not serve as a charge storage unit, but serve only as a color filter. Having. In addition, the present invention is not limited to the surface discharge type PDP, and can be applied to a facing discharge type PDP.

[0043]

According to the present invention, a clear color display can be realized by increasing the contrast, and a plasma display panel with stable display can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing each manufacturing step of a PDP according to the present invention.

FIG. 2 is a cross-sectional view showing a structure of a PDP according to the present invention.

FIG. 3 is an exploded perspective view schematically showing a main part of the PDP of FIG.

[Explanation of symbols]

 Reference Signs List 1 PDP (Plasma display panel) 11 Glass substrate (display-side substrate) 17R, 17G, 17B Colored dielectric layer 21 Glass substrate (back-side substrate) 28R, 28G, 28B Phosphor 40R, 40G, 40B Colorant

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 9/02 H01J 11/02

Claims (1)

(57) [Claims] A pair of substrates (11) on a display surface side and a back side.
(21) A method for manufacturing a plasma display panel (1) having a plurality of phosphors (28R), (28G), and (28B) having different emission colors in the facing gap of (21), wherein the display surface-side substrate ( 11) In each of the inner surfaces of the phosphors (28R), (28G), and (28B), each of the phosphors (28
R) (28G) (28B)
0R), (40G), and (40B), and a low-melting glass paste layer that uniformly covers the surface of the display-side substrate (11) including the coloring materials (40R), (40G), and (40B). (17a) is provided, and the low-melting glass paste layer (17a) and the coloring materials (40R) (40G) (40B) are integrated by heat treatment, and the coloring materials (40R) (40G) ( 40B) providing a colored dielectric layer (17R) (17G) (17B) colored by (B).