JP3219080B2 - Plasma display panel and method of manufacturing the same - 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 (hereinafter referred to as "PDP") utilizing gas discharge light emission for use in a color television receiver or display for displaying characters or images, and a method of manufacturing the same. is there.

[0002]

2. Description of the Related Art A conventional plasma display panel will be described below with reference to the drawings. FIG. 13 is a cross-sectional view schematically showing an AC type (AC type) plasma display panel.

In FIG. 13, reference numeral 41 denotes a front glass substrate, on which a display electrode 42 is formed. Further, the display electrode 42 includes a dielectric glass layer 43 and a magnesium oxide (MgO) dielectric protection layer 44.
(See, for example, JP-A-5-342991).

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 above-mentioned phosphor layers (50 to 52) emits and emits light by ultraviolet rays having a short wavelength (147 nm) generated by discharge.

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

Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu 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.

A blue phosphor (BaMgAl)_TenO₁₇: Eu)
First, barium carbonate (BaCO _Three), Magnesi carbonate
Um (MgCO_Three), Aluminum oxide (α-Al
_TwoO_Three) Is 1: 1: 1: 10 by atomic ratio of Ba, Mg and Al.
To be mixed. Next, a predetermined amount of acid is added to the mixture.
Europium (Eu)_Two0_Three) Is added. And the appropriate amount
Flux (AlF_Two, BaCl_Two) With ball mill
At 1400 ° C. to 1650 ° C. for a predetermined time (eg,
0.5 hours), reducing atmosphere (H_Two, N_TwoBaking in the middle)
Get it.

The red phosphor (Y ₂ O ₃ : Eu) is prepared so that the ratio of yttrium hydroxide Y ₂ (OH) ₃ and boric acid (H ₃ BO ₃ ) to Y and B is 1: 1 as raw materials. Mix. next,
A predetermined amount of europium oxide (Eu ₂
O ₃ ) is added, mixed with a suitable amount of flux in 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 becomes 2: 1. Next, a predetermined amount of manganese oxide (Mn ₂ O ₃ ) was added to the mixture, and the mixture was mixed by a ball mill.
C. for a predetermined time (for example, 0.5 hour).

A phosphor material having a predetermined particle size distribution is obtained by crushing and sieving the phosphor particles produced by the above method.

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 partition made of glass are formed at a predetermined pitch on the address electrode.

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 glass frit for sealing with the front plate is applied around the back plate, and calcined at about 350 ° C. to remove resin components and the like in the glass frit (temporarily sealing glass frit). Baking process).

Thereafter, 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 electrodes and the address electrodes intersecting each other with a partition wall therebetween, and are baked at about 450 ° C. The surroundings are sealed with a glass for sealing (sealing step).

Thereafter, the inside of the panel is evacuated while being heated to about 350 ° C. (evacuation step), and after completion, a discharge gas is introduced at a predetermined pressure.

[0017]

In the conventional method of manufacturing a plasma display panel, there are several steps that require substrate heating as described above.

However, in these heating steps, there is a problem that the phosphor used is thermally deteriorated, and particularly in the sealing step, the blue phosphor is greatly deteriorated. This is BaMgAl ₁₀ O ₁₇ used as a blue phosphor:
It is considered that Eu ²⁺ ions, which are activators in Eu, are oxidized to Eu ³⁺ ions in the sealing step, causing a reduction in emission intensity and deterioration of emission chromaticity. At this time, the deterioration in the central portion in the lateral direction of the panel is particularly large, which has caused the blue light emission characteristics after the panel is completed to be non-uniform in the plane.

Accordingly, in view of the above problems, the present invention hardly causes thermal degradation of the phosphor even through the sealing step required for the panel manufacturing process, operates with relatively high luminous efficiency, and has a high color efficiency. It is an object of the present invention to provide a plasma display panel having good reproducibility.

[0020]

In order to achieve the above object, a plasma display panel according to the present invention comprises an electrode and a back plate between a front plate and a back plate which are disposed to face each other.
A partition wall and a plurality of color phosphor layers having a vertical relationship with the long side are provided, and there is a plasma display panel in which a gas medium is sealed, and in a sealing step between the front plate and the back plate.
Water in the panel sandwiched between the front plate and the back plate
50 holes to eliminate vapor to the long side near the front plate
It is characterized by being formed adjacently at an interval of not more than cm . Further, the plasma display panel of the present invention,
The electrodes are located between the front plate and the back plate
Partition walls and multiple colors of fluorescence parallel to the long side of the back plate
And a plasma layer in which a gas medium is enclosed.
There is a spray panel for sealing the front plate and the back plate.
A panel sandwiched between the front plate and the back plate in the attaching process.
The hole for removing water vapor in the front panel is near the short side of the front plate.
Be formed adjacent to each other at an interval of 50 cm or less
May be characterized.

In the above configuration, it is preferable that the holes are formed near each of a pair of long sides of the back plate.

[0022]

In the above structure, the front plate has a hole of 30 cm.
Preferably, they are formed adjacently at the following intervals.

The chromaticity coordinate y (CI) of the emission color when only the blue cells of the plasma display panel are turned on.
E color system) is preferably 0.08 or less.
It is more preferably 07 or less and 0.06 or less.

Further, the chromaticity coordinates y (C) of the emission color when only the blue cells of the plasma display panel are turned on.
The in-plane variation of the IE color system is preferably 0.008 or less, and more preferably 0.

Next, a method for manufacturing a plasma display panel of the present invention is disposed opposite a front plate of the backplate
In between, having a partition perpendicular to the long side of the back plate, a method for manufacturing a plasma display panel further comprising a sealing step of sealing the front plate and the back plate, wherein in the sealing step, glass tube open der provided hole upper formed in the long side near the front plate is, the said front plate back
Water vapor in the panel sandwiched between the face plates is
And following a path taken through the hole . In addition, between the front plate and the rear plate
The rear plate has a partition wall parallel to the long side thereof, and further has a front plate
Plasma display having a sealing step of sealing the substrate and the back plate
A method for manufacturing a play panel, comprising:
And provided above a hole formed near the short side of the front plate.
Glass tube is open, the front plate and the back
The water vapor inside the panel sandwiched between the boards is removed by the partition walls
Following the path taken and eliminating through the hole.
Or it may be that.

In the above configuration, a pair of long sides of the back plate
Preferably, holes are formed in the vicinity of each.

Preferably, the holes formed in the front plate are adjacent to each other at an interval of 50 cm or less. More preferably, it is 30 cm or less.

Preferably, the sealing step is performed in a vacuum atmosphere.

Further, the sealing step is preferably performed in a dry gas atmosphere.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a plasma display panel according to an embodiment of the present invention will be described. FIG. 5 is a sectional view schematically showing an AC surface discharge type plasma display panel according to one embodiment of the present invention. In FIG. 5, only one cell is shown, but red,
A PDP is configured by arranging a large number of cells that emit green and blue light.

This PDP has a front plate on which a display electrode 22, a dielectric glass layer 23 and a protective layer 24 are disposed on a front glass substrate 21, and an address electrode 2 on a rear glass substrate 25.
6. A structure in which a discharge gas is sealed in a discharge space formed between the front plate and the back plate by laminating the back plate on which the visible light reflection layer 27, the partition wall 28, and the phosphor layer 29 are arranged. .

As the composition of the phosphor material constituting the phosphor layer, those generally used for the phosphor layer of PDP can be used. Specific examples thereof include a blue phosphor BaMgAl ₁₀ O ₁₇ : Eu green phosphor Zn ₂ SiO ₄ : Mn red phosphor (Y _x Gd _{1 -x} ) BO ₃ : Eu.

FIGS. 2 and 3 show that the blue phosphor (BaMgAl ₁₀ O ₁₇ : Eu) used was baked in air at a peak temperature of 450 ° C. for 20 minutes, and the partial pressure of water vapor in the air was changed. The measurement results of the relative luminous intensity and the chromaticity coordinate y at the time of dependency on the partial pressure of water vapor are shown. Relative luminous intensity was calculated by comparing the luminous intensity of the blue phosphor
And The chromaticity coordinate y of the blue phosphor before firing is 0.1.
052.

When the water vapor partial pressure was around 0 Torr, no thermal degradation of the luminescence intensity and no change in chromaticity due to heating were observed, and the relative luminescence intensity became weaker with an increase in the water vapor partial pressure. The chromaticity coordinate y increases as the water vapor partial pressure increases. When the chromaticity coordinate y of the blue phosphor increases, a problem occurs that the color reproduction range of the panel is narrowed.

Conventionally, a blue phosphor (BaMgAl)
_It is considered that the reason why the emission intensity is deteriorated by heating ₁₀ O ₁₇ : Eu) or the y value is increased is that the activator Eu ²⁺ ions are oxidized by heating to become Eu ³⁺ ions. . However, as a result of the measurement of the partial pressure of water vapor, the thermal degradation of the blue phosphor is not caused by the reaction of Eu ²⁺ ions directly with oxygen in the atmosphere (for example, air), but by the heat caused by water vapor in the atmosphere. It is considered deterioration. That is, it has been found that by reducing the partial pressure of water vapor in the atmosphere, it is possible to prevent thermal deterioration due to heating of the blue phosphor (BaMgAl ₁₀ O ₁₇ : Eu).

By the way, the heating temperature is from 300 ° C. to 600 ° C.
In the range, the thermal degradation of the luminescence intensity increases with an increase in the heating temperature, but the tendency is that the thermal degradation increases with an increase in the partial pressure of water vapor. The change in the chromaticity coordinate y did not depend on the temperature, but depended only on the partial pressure of water vapor.

In consideration of the manufacturing process of the plasma display panel, the sealing process for sealing the front plate and the back plate is narrower than that of the phosphor firing process and the glass frit calcining process for sealing. Since the gas is confined in the space, it is considered that the gas containing the water vapor released from the protective layer on the front panel and the phosphor layer formed on the rear panel or the sealing glass during heating is greatly affected.

When the amount of water vapor released from the above members was measured, the amount of water released from the protective film MgO was the largest.

The PD according to the present embodiment for eliminating the influence of gas containing water vapor released from these members will be described below.
P and its sealing step will be described.

FIG. 1 is a diagram schematically showing the positions of holes in the front plate of the PDP in the present embodiment. At the end of the front plate 1, a hole 2 is provided inside the glass frit 5 for sealing, avoiding the electrode forming portion 3, and a hole must be provided at least at the end near the long side of the glass substrate. There is. These holes 2 include those that also serve to exhaust the inside of the panel sandwiched between the front plate 1 and the back plate 4 or to fill the inside of the panel with a discharge gas or a getter. Also,
When the panel is completed, the hole is sealed with a glass tube.

FIG. 4 is a view schematically showing the configuration of a heating device for sealing. The heating device for sealing comprises a gas introduction valve 6 and a gas discharge valve 7 for adjusting the atmosphere gas or the degree of vacuum in the furnace, and a heating furnace 10 for heating the front plate 8 and the back plate 9. In each hole 11 provided in the front plate 8, a glass tube 12 having both ends opened is fixed using a glass frit 13.

In the sealing step, the water vapor adsorbed on the front plate 8 and the back plate 9 at the time of raising the temperature is released (particularly, M of the front plate).
gO). Some of these water vapors are
Is removed to the outside through a hole 11 and a glass tube 12. However, as shown in FIGS. 10 to 12, the conventional panel has a small number of holes or has no holes near the long side of the glass substrate, so that water vapor in the panel cannot be sufficiently ventilated, and the blue phosphor is not sealed in the sealing step. It had greatly deteriorated. Furthermore, in the conventional panel, since the hole position is provided only at the end in the direction parallel to the partition wall, the deterioration in the lateral center of the panel is particularly large, and the blue light emission characteristics after the panel is completed are non-uniform in the plane. Was also a cause.

As in the present embodiment, by providing holes near the long sides of the front plate, that is, at the ends in the direction perpendicular to the partition walls, and by increasing the number of holes, the water vapor generated during sealing can be efficiently removed. In addition, the blue phosphor is uniformly removed to the outside of the panel, so that the thermal degradation of the blue phosphor in the sealing step can be suppressed.

Further, by flowing a dry gas such as dry air into the apparatus or heating while performing vacuum evacuation, the partial pressure of water vapor inside the panel can be further reduced, and the deterioration of the blue phosphor is further reduced. Was suppressed. As for the partial pressure of water vapor of the drying gas, the lower the water vapor partial pressure is, the more the deterioration of the blue phosphor is suppressed as shown in FIG. 2 and FIG. 3, but a remarkable effect appears at around 1995 Pa (15 Torr).

After the sealing was completed, a glass tube other than the glass tube for exhausting the inside of the panel and filling the discharge gas was partially inserted with a getter and sealed, and then the discharge gas was filled through the exhaust process. .

After filling the discharge gas, the glass tube for filling the discharge gas was sealed to complete the panel.

(Example)

[0049]

[Table 1]

Table 1 is a table showing the configuration, sealing conditions, and emission characteristics of each PDP panel created based on the embodiment. The PDPs of panel numbers 1 to 9 are PDPs according to the examples manufactured based on the above embodiment. The size of the panel is 42 "size. FIGS. 6 to 8 schematically show front panel hole positions of panel numbers 1 to 3 and FIG. 9 show panel hole positions of panel numbers 4 to 9 respectively. The atmosphere in the furnace at the time of sealing was changed, and dry air was used as the drying gas.

The PDPs of panel numbers 10 to 12 are PDPs according to the comparative example, and the positions of the holes in the back plate are schematically shown in FIGS.

In each of the above PDPs, the sealing step had a temperature profile in which the peak temperature was maintained for 20 minutes. Also,
The panel configuration was the same except for the holes in the front plate, the phosphor film thickness was 30 μm, and the discharge gas was Ne (95%)-Xe (5
%) Was sealed at 66500 Pa.

The emission characteristics evaluated by lighting the panel include the emission intensity of blue (a value obtained by dividing luminance by chromaticity coordinates y).
And the chromaticity coordinates y were measured at three points (left, center, and right) on the panel. The blue light emission intensity is shown as a relative light emission intensity with the center of panel number 12 of the comparative example being 100.

[0054] If the long side of the partition wall and the rear panel is in a vertical relationship, the panel number 1-3 emission characteristics evaluation results of the comparison, the front surface
As the number of holes near the long side of the plate increases, the emission characteristic of blue improves (the relative emission intensity increases and the chromaticity coordinate y decreases), and the surface uniformity improves. This is presumably because as the number of holes increases, the water vapor released inside the panel at the time of sealing becomes more easily ventilated, the water vapor remaining inside the panel decreases, and the thermal degradation of the blue phosphor is suppressed.

The same result was obtained as the number of holes in the vicinity of the long side increased, even when the partition and the long side of the back plate were in a parallel relationship. Similar results were obtained even when a hole was formed only near the short side of the front plate . From the above results, it can be seen that when the water vapor released inside the panel at the time of sealing is ventilated by the hole opened at the end of the panel, it follows the path partitioned by the partition wall. It can be said that it is desirable to have a hole at the end of the glass substrate in the vertical direction.

Panel No. 4 shown in FIG. 9 has excellent blue light emission characteristics and excellent surface uniformity.

If the hole positions are the same, panel number 4
From the evaluation comparisons of Nos. To 9, for the same reason, the blue light emission characteristics were improved as the water vapor partial pressure of the dry air in the sealing furnace was lowered. Also, based on the evaluation results of the panel 6, the luminous characteristics were improved by evacuating the inside of the sealing furnace.

Further, in the conventional examples 10 to 12, since all the hole positions are provided at the end portions of the panel in the direction parallel to the partition walls, the partial pressure of water vapor in the panel at the time of sealing becomes nonuniform, and the blue light emission characteristic is reduced. Although it was not uniform in the plane, uniform blue light emission was realized in the panel plane by providing a hole in the panel end perpendicular to the partition wall as in the present embodiment.

Although the surface discharge type PDP is exemplified in the above embodiment, the present invention can be applied to all PDPs which require a heat step for sealing, such as a facing discharge type PDP.

[0060]

As described above, according to the plasma display panel and the manufacturing method of the configuration of the present invention, it is possible to suppress the deterioration of the luminous characteristics of the phosphor, which has conventionally occurred in the sealing step. A plasma display panel with high luminous efficiency and a wide color reproduction range can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing hole positions on a front plate of a PDP according to an embodiment of the present invention.

FIG. 2 is a diagram showing a water vapor partial pressure dependency of a change in the relative emission intensity of a blue phosphor during heating.

FIG. 3 is a diagram showing a water vapor partial pressure dependency of a change in chromaticity coordinate y of a blue phosphor during heating.

FIG. 4 is a diagram schematically showing a configuration of a heating device for sealing according to an embodiment of the present invention.

FIG. 5 is a schematic sectional view of an AC surface discharge type plasma display panel according to the present embodiment.

FIG. 6 is a schematic diagram showing the positions of holes in the front plate of the PDP according to the embodiment of the present invention.

FIG. 7 is a schematic view showing a hole position of a front panel of the PDP according to the embodiment of the present invention.

FIG. 8 is a schematic view showing a hole position of a front plate of the PDP according to the embodiment of the present invention.

FIG. 9 is a schematic view showing a hole position of a front plate of the PDP according to the embodiment of the present invention.

FIG. 10 is a schematic view showing a hole position of a back plate of a conventional PDP.

FIG. 11 is a schematic view showing a hole position of a back plate of a conventional PDP.

FIG. 12 is a schematic view showing a hole position of a back plate of a conventional PDP.

FIG. 13 is a schematic sectional view of a conventional AC surface discharge type plasma display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 8 Front plate 2, 11 hole 3 Electrode formation part 4, 9 Back plate 5 Glass frit for sealing 6 Gas introduction valve 7 Gas discharge valve 10 Heating furnace 12 Glass tube 13 Glass frit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-329846 (JP, A) JP-A-48-79972 (JP, A) JP-A-9-251839 (JP, A) JP-A-2000-149796 (JP, A) Real opening 1986-65655 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 11/00-11/04 H01J 17/00-17/49 H01J 9 / 24-9/395

Claims (22)

(57) [Claims] An electrode, a partition wall perpendicular to a long side of the back plate, and a phosphor layer of a plurality of colors are disposed between a front plate and a back plate which are disposed to face each other, and a gas medium is sealed. Plasma display panel, the front plate and the front
The front plate and the back plate in a sealing process with the back plate.
Said holes for eliminating water vapor sandwiched panel in
A plasma display panel formed adjacent to a long side of a front plate at an interval of 50 cm or less . (2) Between the front plate and the rear plate arranged opposite
In addition, the electrodes, partition walls and the parallel
And a plurality of color phosphor layers, and a gas medium is sealed therein.
There is a plasma display panel, the front plate and the front
The front plate and the back plate in a sealing step with the back plate.
The hole for eliminating water vapor in the panel sandwiched by
Formed adjacent to the short side of the front plate at an interval of 50 cm or less
Plasma display panel characterized in that
Le. 3. A front plate pair of the plasma display panel according to claim 1 or 2, characterized in that the hole is formed near each of the long sides of the. 4. Before SL plasma display panel according to claim 1, 3 or the holes in the front plate, characterized in that it is formed adjacent at intervals of less than 30 cm. 5. The chromaticity coordinate y (CIE color system) of an emission color when only the blue cell of the plasma display panel is turned on is 0.08 or less.
5. The plasma display panel according to any one of items 1 to 4. 6. The chromaticity coordinate y (CIE color system) of an emission color when only the blue cell of the plasma display panel is turned on is 0.07 or less.
5. The plasma display panel according to any one of items 1 to 4. 7. The chromaticity coordinate y (CIE color system) of an emission color when only the blue cell of the plasma display panel is lit is 0.06 or less.
5. The plasma display panel according to any one of items 1 to 4. 8. An in-plane variation of chromaticity coordinates y (CIE color system) of emission color when only blue cells of a plasma display panel are turned on is not more than 0.008. 5. The plasma display panel according to any one of 1 to 4. 9. Between a front plate and a rear plate disposed opposite to each other.
To have a long side perpendicular bulkhead of the back plate, a method of manufacturing a plasma display panel having a sealing step of sealing the front plate and the back plate, in the sealing step, the front Provided above the hole formed near the long side of the face plate
Glass tube is open, the front plate and the back
The water vapor inside the panel sandwiched between the boards is removed by the partition walls
The hole formed near the long side of the front plate.
A method for manufacturing a plasma display panel, characterized in that the plasma display panel is eliminated by passing through . 10. Of the front plate and the rear plate
In between, there is a partition parallel to the long side of this back plate, and furthermore the front
Plasma display having a sealing step of sealing the plate and the back plate.
A method for manufacturing a spray panel, comprising:
Above the hole formed near the short side of the front plate.
The opened glass tube is in an open state, and the front plate and the
Water vapor in the panel sandwiched between the back plates is separated by partition walls.
Following the path taken, and formed near the short side of the front plate.
Plasma display characterized by removal through holes
Manufacturing method of ray panel. 11. A hole is formed near each of a pair of long sides of a front plate.
0. The method for manufacturing a plasma display panel according to item 0. 12. The method of manufacturing a plasma display panel according to claim 9, wherein adjacent holes formed in the front plate are spaced apart by 50 cm or less. 13. The method of manufacturing a plasma display panel according to claim 9, wherein adjacent holes formed in the front plate have an interval of 30 cm or less. 14. The method of manufacturing a plasma display panel according to claim 9, wherein the sealing step is performed in a vacuum atmosphere. 15. The method for manufacturing a plasma display panel according to claim 9, wherein the sealing step is performed in a dry gas atmosphere. 16. The partial pressure of steam of the dry gas is 1995 pa
(15 Torr) or less.
6. The method for manufacturing a plasma display panel according to 5. 17. A partial pressure of water vapor of a dry gas is 10 Torr.
The method for manufacturing a plasma display panel according to claim 15, wherein: 18. The partial pressure of water vapor of the drying gas is 665 pa.
(15 Torr) or less.
A manufacturing method of the plasma display panel according to the above. 19. A partial pressure of steam of the drying gas is 133 pa.
(15) or less (1 Torr) or less.
A manufacturing method of the plasma display panel according to the above. 20. The method for manufacturing a plasma display panel according to claim 15, wherein the dry gas does not contain water vapor. 21. The method according to claim 15, wherein the drying gas contains oxygen. 22. The method according to claim 15, wherein the dry gas is dry air.