CN100470710C - plasma display panel - Google Patents

Abstract

A plasma display panel removes impurity gases from the plasma display panel, suppresses phosphor degradation, and has high reliability. A front panel (2) with multiple scanning electrodes (6) and multiple sustaining electrodes (7) arranged in parallel and a back panel (3) with multiple data electrodes (12), partitions, and vent holes (15) arranged in parallel are arranged opposite each other in the direction where the scanning electrodes (6) and sustaining electrodes (7) of the front panel (2) and the data electrodes (12) of the back panel (3) intersect. A non-evaporative getter (19) such as zeolite is disposed inside the plasma display panel (1) near the vent holes (15).

Description

plasma display panel

technical field

The present invention relates to a plasma display panel, in particular to a plasma display panel whose discharge characteristics and phosphor characteristics are stable.

Background technique

In recent years, among color displays used for displaying images on computers and televisions, plasma display devices using plasma display panels (hereinafter referred to as PDPs) have attracted attention as large, thin and lightweight color displays.

A PDP is configured by sealing a predetermined discharge space on a front panel and a rear panel. Structures containing an organic binder are fired on the front and rear plates to form electrodes and dielectric layers, partition walls, and phosphor layers, respectively.

In the PDP manufacturing process, especially in the sealing process of sealing the front panel and the rear panel, impurity gas formed by thermal decomposition of an organic binder contained in glass frit used as a sealing material diffuses into the PDP. The main components of the impurity gas are water vapor, carbon dioxide gas, and hydrocarbon gas. These impurity gases are adsorbed on the phosphors in the PDP, etc., causing problems such as deterioration of discharge characteristics and decrease in brightness. This is disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2003-281994 and FPD Technology Encyclopedia (Electronics Ja-naru, October 25, 2000, PP615-618) and the like.

Therefore, techniques for improving reliability such as reducing impurity gases inside the PDP, stabilizing discharge characteristics, and suppressing changes over time have become one of important issues.

To achieve this, a method is widely used in which, after sealing the front panel and the rear panel, heating the inside of the PDP and performing vacuum evacuation to remove impurity gases in the PDP, and then injecting a discharge gas. FIG. 6 is a sectional view of such a conventional PDP manufacturing apparatus. The PDP main body 60 is composed of a front panel 61 and a rear panel 62 , and a partition wall 63 and a phosphor layer 64 are formed on the rear panel 62 . The peripheries of the front panel 61 and the rear panel 62 are sealed by a sealing member 72 . An exhaust pipe 65 is connected to the rear panel 62 of the PDP main body 60 . In addition, the PDP main body 60 is arranged in a furnace 67 having a heater 66 . The other end of the exhaust pipe 65 is divided into two paths, one of which is connected to the vacuum pump 70 through a valve 68, and the other is connected to the gas cylinder 71 through a valve 69.

In such a manufacturing apparatus, first, the PDP main body 60 is heated by the heater 66, and at the same time, the valve 68 is opened, and the inside of the PDP 69 is depressurized by the vacuum pump 70 to discharge impurity gases inside the PDP. Then, the valve 68 is closed, the valve 69 is opened, and the discharge gas composed of neon and xenon is injected into the PDP from the gas cylinder 71. Finally, the exhaust pipe 65 near the PDP is heated and melted by a burner, etc., and the sealing is completed. PDP with discharge gas.

Japanese Patent Laid-Open No. 2000-311588 discloses this method of not only discharging the impurity gas in the PDP body 60, but also installing an aspirator inside the PDP body 60 to absorb the impurity gas. It is disclosed in the Japanese Patent Laid-Open No. 11-329246 A method in which an aspirator is provided inside the exhaust pipe 65 to adsorb impurity gas is provided.

However, in the above-mentioned conventional method, since the discharge gas is injected through the exhaust pipe, the impurity gas discharged from the PDP is adsorbed on the inner wall of the exhaust pipe, and enters the PDP together with the discharge gas again when the discharge gas is supplied. Inside, the removal of impurity gases is insufficient. In addition, in the method of providing a getter inside the PDP to absorb impurity gas, since the discharge space is divided by the partition wall, the gettering effect cannot be exerted on the entire area, and an area where the impurity gas remains remains causes display unevenness. In addition, there is a problem that the getter is heated during discharge, and impurity gas is released again into the PDP. In the method of providing an aspirator inside the exhaust pipe to remove impurity gas, there is a problem that impurity components gradually accumulate in the aspirator, and the ability to remove impurity gas gradually decreases.

Contents of the invention

The present invention was developed to solve the above-mentioned problems, and provides a stable PDP capable of cleaning the interior of the PDP, suppressing false discharges and lowering of luminance, and having high reliability with less deterioration of phosphors having high display characteristics.

In order to solve the above-mentioned problem, the PDP of the present invention includes: a front panel and a rear panel disposed opposite to each other to form a space formed by an image display area and its peripheral portion; an exhaust hole provided on the front panel and the On at least one of the back plates, the inside of the space is exhausted and a discharge gas is injected into the space, at the peripheral portion of the space, at the end of the exhaust hole and the image display area There is a non-evaporative aspirator between the parts.

With such a structure, impurity gas entering from the inside or outside of the PDP can be adsorbed on the non-evaporable getter, that is, the gas adsorption layer, and degradation of the brightness of the phosphor caused by the impurity gas can be suppressed.

Description of drawings

Fig. 1 is the plan view of the general structure of the PDP of the first embodiment of the present invention;

Fig. 2 is a sectional perspective view of a partial schematic structure of the image display area of the above-mentioned PDP;

Fig. 3 is a sectional view along the X direction in Fig. 2;

4 is a schematic diagram of the structure of a manufacturing device used in the PDP exhaust process and gas encapsulation process in the first embodiment of the present invention;

5 is a plan view of the back panel of the PDP of the second embodiment of the present invention;

FIG. 6 is a schematic diagram showing the configuration of a manufacturing apparatus used in an exhaust process and a gas filling process of a conventional PDP.

Detailed ways

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

first embodiment

FIG. 1 is a plan view showing a schematic structure of a PDP according to a first embodiment of the present invention. 2 is a sectional perspective view showing a partial schematic structure of the image display area of the PDP according to the first embodiment of the present invention. 3 is a schematic structure of the PDP according to the first embodiment of the present invention, and is a cross-sectional view taken along the X direction in FIG. 2 .

The PDP 1 has a structure in which a pair of front panel 2 and rear panel 3 face each other with a partition wall 4 therebetween. The front panel 2 includes: a display electrode 8, which is composed of a scan electrode 6 and a sustain electrode 7 formed on a main surface of the glass substrate 5; a dielectric layer 9, which is formed to cover the display electrode 8; a protective layer 10, It is formed using, for example, MgO, further covering the dielectric layer 9 . Scan electrode 6 and sustain electrode 7 have a structure in which bus electrodes 6b, 7b are laminated on transparent electrodes 6a, 7a.

The back panel 3 includes: a data electrode 12 formed on one main surface of the rear glass substrate 11; a dielectric layer 13 formed to cover the data electrode 12; a partition wall 4 formed on the dielectric layer 13 corresponding to the data electrode The positions between; the red, green, and blue phosphor layers 14R, 14G, and 14B formed between the partition walls 4; the exhaust holes 15.

The front plate 2 and the rear plate 3 having the above-mentioned structure are arranged so that the surface electrodes 8 and the data electrodes 12 are orthogonally opposed to each other, and the discharge space 16 is formed by the front plate 2 and the rear plate 3 sandwiching the partition walls 4 . The front panel 2 and the rear panel 3 are bonded and sealed by a sealing member 18 formed at a predetermined position on the periphery of the front panel 2 and/or the rear panel 3 , that is, outside the image display area 17 .

In addition, a non-evaporable getter 19 is provided inside the PDP 1 near the exhaust hole 15 , for example, on the side of the rear panel 3 . Then, an exhaust pipe 20 is bonded to the outside of the rear panel 3 to surround the exhaust hole 15 . The exhaust pipe 20 is used to evacuate the interior and seal the discharge gas inside during the manufacturing process of the PDP 1 , and then the exhaust pipe 20 is sealed to complete the PDP 1 .

At least one inert gas of helium, neon, argon, and xenon is sealed in the discharge space 16 at a pressure of about 66500 Pa (500 Torr), and the intersection of the data electrode 12 and the display electrode 8 separated by the partition wall 4, that is, the scan electrode 6 and the sustain electrode 7 The portion functions as a discharge cell 21 which is a unit light-emitting area.

That is, in the discharge cell 21 to be turned on, a periodic voltage is applied between the display electrode 8 and the data electrode 12, and between the scan electrode 6 and the sustain electrode 7 of the display electrode 8 to generate a discharge. Ultraviolet rays excite phosphor layers 14R, 14G, and 14B to generate visible light. Then, image display is performed by a combination of lighting and non-lighting of the discharge cells 21 of the respective colors.

On the other hand, the evacuation process and the discharge gas filling process of such a PDP will be described with reference to FIG. 4 . The same devices as the conventional device shown in FIG. 6 were used for the exhaust device and the discharge gas filling device. While heating the PDP 1 with the heater 66 , the valve 68 is opened, and the inside of the PDP 1 is depressurized by the vacuum pump 70 through the exhaust pipe 20 to exhaust the impurity gas inside the PDP 1 . Then, the valve 68 is closed, the valve 69 is opened, and a discharge gas composed of an inert gas is injected into the PDP 1 from the gas cylinder 71. Finally, the exhaust pipe 20 is heated and melted by a burner to seal it, and the PDP 1 enclosing the discharge gas is completed. .

In this way, while PDP1 is heated by heater 66, vacuum pump 70 is operated to discharge the gas containing impurity gas inside PDP1, and most of the impurity gas can be discharged from PDP1. However, in the prior art, these impurity gases adhere to the inner surface of the exhaust pipe 20 and cannot be completely removed from these exhaust passages, but remain. Therefore, these impurity gases are returned to the inside of the PDP 1 in the subsequent encapsulation process, and a trace amount of the impurity gases remain in the PDP 1 , which affects the deterioration of the luminance of the phosphor.

Especially in the impurity gas, even if the hydrocarbon gas is at a low concentration of about 1/100 to 1/1000 of water and 1/10 to 1/100 of carbon dioxide gas, it will make the green phosphor 14G and the blue The characteristics of the phosphor 14B deteriorate. The mechanism is that when Zn ₂ SiO ₄ :Mn is used as the green phosphor, the gas adsorption force of Zn ₂ SiO ₄ :Mn is large, and when BaMgAl ₁₀ O ₁₇ :Eu is used as the blue phosphor, the hydrocarbon gas utilizes The discharge energy is decomposed into hydrogen and carbon, and due to reduction by these hydrogens, oxygen vacancies are generated.

The characteristic point of the PDPI according to the embodiment of the present invention described above is that the non-evaporable getter 19 is disposed inside the PDP 1 near the exhaust hole 15 .

With such a structure, after the front panel 2 and the back panel 3 are bonded and sealed, when the gas in the PDP 1 is exhausted and the discharge gas is enclosed, the impurity gas adsorbed and remaining near the exhaust hole 15 in the conventional structure will be released. In this embodiment, it is adsorbed on the non-evaporative getter 19 . Therefore, it is possible to reduce the adsorption and remaining of impurity gases in the vicinity of the exhaust hole 15, and to suppress misdischarge, decrease in luminance, and the like.

In addition, it is of course necessary to arrange the non-evaporative getter 19 outside the image display area 17 so as not to interfere with the image display.

In the embodiment of the present invention, the getter 19 must be installed in the PDP 1 near the exhaust hole 15 before the sealing process, but the sealing process is a process of heating the glass frit to the firing temperature in the atmosphere. Therefore, sometimes the getter 19 is activated. At this time, since the getter 19 absorbs the air, there arises a problem that the original purpose effect of absorbing the impurity gas in the PDP 1 is weakened. In order to avoid such problems, for example, after the temperature at the time of sealing is raised to at least the temperature at which the getter 19 will be activated, an inert gas such as argon is used for the atmosphere in the subsequent process, or the material of the getter 19 is preferably The air adsorbed during the sealing process can be discharged from the following exhaust process, and at the same time, the material can be activated again to restore the adsorption function.

In addition, in the above description, an example in which the getter 19 is disposed on the rear panel 3 side of the PDP 1 near the exhaust hole 15 is illustrated, but it is not particularly limited thereto, and may be provided on the front panel 2 side. Or a structure provided on both sides, etc.

In this embodiment, zeolite may be used as the non-evaporable getter 19 when the focus is mainly on removing impurity gas discharged from the sealing member 18 as impurity gas in view of the degree of influence on the display characteristics. As the zeolite, it is effective to use ion-exchanged zeolite, lithium ion-exchanged mordenite, sodium ion-exchanged mordenite, calcium ion-exchanged faujasite (type X), clinoptilolite, and the like. In addition, since zeolite is inexpensive, the same effect can be obtained at low cost by using a getter.

second embodiment

FIG. 5 is a plan view of the rear panel 3 of the PDP 1 according to the second embodiment of the present invention. According to the present embodiment, non-evaporable getter 19 that is zeolite is disposed on the entire circumference of non-image display region 30 between image display region 17 and sealing member 18 .

With such a structure, the adsorption area of the zeolite can be increased, and the effect of removing impurity gases can be further enhanced.

In addition, such a structure of arranging the non-evaporable getter in the PDP can be selected arbitrarily, and can be easily formed by applying a paste containing zeolite or the like to an arbitrary area of the non-image display area 30 .

The PDP of the present invention realizes a PDP with excellent image display quality and high reliability without luminance degradation, and is useful as a display device such as a wall-mounted television or a large monitor.

Claims (3)

1, a kind of Plasmia indicating panel comprises: front panel and backplate, and it disposes relatively, to form the space that is made of image display area and its periphery; Steam vent, it is arranged at least one of described front panel and described backplate, and the inside in described space is carried out exhaust and inject discharge gas in described space,

At the described periphery in described space, between the end of described steam vent and described image display area, be provided with non-evaporation type aspirator.

2, Plasmia indicating panel as claimed in claim 1 is characterized in that, non-evaporation type aspirator is a zeolite.

3, Plasmia indicating panel as claimed in claim 2, it is characterized in that described zeolite is selected at least from ion exchanged zeolite, lithium ion crossover modenite, sodium ion crossover modenite, calcium ion-exchanged type faujasite, clinoptilolite.

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