JP2010244967A - Method for manufacturing plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel (PDP) which can lessen unevenness of a gap between a front panel and a back panel resulting in generation of a gap between a front substrate and a partition, thereby can restrain generation of noises. <P>SOLUTION: In a method for manufacturing the plasma display panel having a process of sealing outer peripheral sections of two substrates 1, 2 arranged to face each other with a sealing member 11, a pressure difference wherein panel internal pressure is set up to be smaller than external pressure is prepared upon softening the sealing member 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a plasma display panel which is a display panel.

  Currently, plasma display panels (hereinafter referred to as PDPs) are expected as large displays. The PDP is a self-luminous type and has excellent features such as high-speed response and a wide viewing angle. In addition, it is said to be suitable for a large display because the manufacturing process is relatively simple.

  FIG. 5 is a sectional perspective view showing a partial schematic structure of a conventional AC type PDP. On the front substrate 1 on the display side, a transparent electrode 7a formed of ITO or the like and a metal electrode 7b for lowering the line resistance value of the transparent electrode 7a are formed in a stripe shape. The discharge electrode 7 is configured to supply power for generating electric power. A relatively transparent dielectric layer 8 is formed so as to cover the discharge electrode 7, and a protective layer 9 further covers it. Further, in order to improve the contrast on the display side, a stripe-like line (not shown) having a black color or other dark color called a black stripe may be formed between the adjacent discharge electrodes 7.

  An address electrode 3 for pixel selection is arranged on the rear substrate 2 so as to intersect with the discharge electrode 7 on the front substrate 1. Further, an electrode protection layer 4 covering the address electrode 3 and the front substrate 1 are provided. Are formed between the barrier ribs 5 for the purpose of forming a constant gap and a phosphor 6 for converting ultraviolet light generated by discharge into visible light (see Patent Document 1). ).

JP 2003-131580 A

  By the way, in the manufacturing process of the PDP, the front substrate 1 and the rear substrate 2 are arranged to face each other with a gap determined by the partition wall 5, and then the front substrate 1 and the rear substrate 2 are formed on the peripheral portion. By sealing with a sealing member such as frit glass, the container (panel) is kept airtight, and then the inside of the panel is evacuated once, and then the discharge gas is sealed at a desired pressure. By doing so, it is completed as a PDP.

  Here, as the sealing member, for example, a frit obtained by mixing a powder such as ceramics with a low melting point glass with a cellulosic resin and a solvent such as isoamyl acetate can be used as a paste, The paste is applied to the outer periphery of the glass substrate and calcined at a predetermined temperature (for example, about 350 ° C.) to remove the resin component and the like of the paste. It is formed on the outer periphery of at least one of the substrates PA2.

  Then, the front panel PA1 and the rear panel PA2 are pressed and fixed by the metal clip 10 in a state of facing each other as schematically shown in a plan view in FIG.

  Then, the sealing member is temporarily melted and softened by heating to a sealing temperature of, for example, about 450 ° C., and then cooled and solidified for sealing.

  However, when pressing and fixing using the clip 10, it is difficult to say that a uniform force is acting on the panel surface. That is, for example, if there is variation in the pressing force of the clip 10, the pressing force is small in the weak clip portion, so that the sealing member is not sufficiently crushed, and the height becomes higher than the peripheral portion.

  In such a case, the gap between the front panel PA1 and the rear panel PA2 is not uniform, and the gap between the front substrate PA1 and the partition wall 5 may be generated as well as the reliability of the seal portion is lowered. .

  When such a gap is generated between the front substrate PA1 and the partition wall 5, it causes not only a problem in image display, but also periodically in the discharge electrode 7 and the address electrode 3 during image display. Is applied, and attractive force or repulsive force acts between the front substrate PA1 and the back electrode PA2. Therefore, a movement that changes the relative positional relationship between the front substrate PA1 and the back electrode PA2 occurs. As a result, noise may be generated due to the vibration of the front substrate PA1 and / or the back electrode PA2. This noise is a problem because it can be heard as an unpleasant sound for the viewer.

  The present invention has been made in view of such a current situation, and the non-uniformity of the gap between the front panel and the rear panel, which causes the gap between the front substrate and the partition wall, is reduced, so that the noise is reduced. An object is to provide a PDP in which generation is suppressed.

  In order to achieve the above object, a method for manufacturing a plasma display panel according to the present invention includes a step of sealing the outer peripheral portions of two substrates arranged opposite to each other with a sealing member. When the member is softened, a pressure difference that makes the panel internal pressure smaller than the external pressure is provided.

  According to the present invention, since the non-uniformity of the gap between the front panel and the rear panel, which causes the gap between the front substrate and the partition wall, is reduced, the generation of noise is suppressed in the PDP. Can be provided.

The figure which shows schematically the state in the baking furnace in the manufacturing method of PDP by one embodiment of this invention. The figure which shows schematically the state in the baking furnace in the manufacturing method of PDP by one embodiment of this invention. The figure which shows schematically a piping system in the manufacturing method of PDP by one embodiment of this invention. The figure which shows typically the state at the time of manufacturing several panels simultaneously in the manufacturing method of PDP by one embodiment of this invention. Cross-sectional perspective view showing schematic configuration of PDP The figure which shows the state in the manufacturing method of the conventional PDP roughly

[Embodiment 1]
Hereinafter, although the manufacturing method of PDP by one Embodiment of this invention is demonstrated using figures, the aspect of this invention is not limited to this.

  First, as schematically shown in a perspective view in FIG. 1, a sealing member 11 made of amorphous glass and formed on at least one peripheral portion of a front substrate 1 and a rear substrate 2 is provided. And is pressed and fixed by the clip 10 and placed in the firing furnace 12 in that state, and is heated to a sealing temperature, for example, about 450 ° C., and the sealing member is once melted and softened. Then, the front substrate 1 and the back substrate 2 are bonded together by cooling and solidifying. At the same time, the pipe 16 is joined to the back substrate 2 by the pipe fixing member 17. The above state is called a “panel”.

  Here, in the method of manufacturing a PDP according to an embodiment of the present invention, it is not necessary to press the panel surface uniformly with clips, and the number of clips that can be pressed to the extent that they are temporarily fixed may be used. However, as long as the atmospheric pressure difference described later can be obtained, a strict airtightness may not necessarily be obtained.

  Next, the temporarily bonded panel obtained as described above is installed in the firing furnace 12 in a state of being connected to the decompression vessel 50 as schematically shown in a sectional view in FIG. Note that the inside of the decompression container 50 is in a decompressed state by the pump 13.

  Then, when the solidified sealing member is re-melted to a temperature at which it is re-melted, and when the sealing member is re-melted, the decompression container 50 and the inside of the panel are connected so that the pressure inside the panel The pressure should be less than Then, the sealing member is cooled and solidified.

  By doing so, the front substrate 1 and the rear substrate 2 are in close contact with each other with good uniformity of the distance over the entire surface due to the pressure difference between the inside and outside of the panel in a state where the sealing member 11 is remelted. Since the sealing member 11 is cooled and solidified in a state where the adhesiveness is good, a panel in which the front substrate 1 and the rear substrate 2 are joined together with a uniform spacing over the entire surface is obtained. be able to.

  Thereafter, the inside of the panel is continuously evacuated by the pump 13 for a predetermined time, the discharge gas is subsequently sealed in the panel, and then the piping 16 is sealed (chip off), thereby completing the PDP.

  As described above, in the method for manufacturing a PDP according to an embodiment of the present invention, the entire surface of the panel is obtained by reducing the panel internal pressure to the panel external pressure while the sealing member 11 is softened. Since uniform pressing is achieved by the pressure difference between the panel internal pressure and the panel external pressure, a PDP having a uniform gap over the entire surface in the plane can be manufactured.

  Here, in the above process, it is necessary to use an amorphous material having a property of being remelted by reheating as the material of the sealing member 11, but a pipe fixing member 17 for joining the pipes 16. As the pipe fixing member 17 is made of a crystalline glass frit material that is difficult to be remelted even by reheating, an amorphous material is used. If a glassy material is used, it is preferable to use a frit material having a softening point temperature higher than that of the sealing member 11.

  Moreover, the process of temporary joining demonstrated using FIG. 1 and the process of producing PDP with a uniform gap over the in-plane whole surface using the atmospheric | air pressure difference demonstrated using FIG. 2 are continuous. Good to go to. That is, it is a step of causing a pressure difference at the same time as melting the sealing member for temporary joining. In order to realize this, it is preferable that the pipe 16 is bonded to the back substrate 2 in advance.

  Further, as shown in a perspective view of the schematic configuration in FIG. 3, a piping system in which an exhaust system 15a and a gas introduction system 15b are separated is connected to a panel that is sealed and can maintain an airtight inside. To do. The decompression vessel 50 is evacuated to vacuum by the pump 13 by the exhaust system 15a. After exhausting, the panel-filled gas 20 or other inert gas is introduced into the decompression vessel 50 by the gas introduction system 15b. The decompression vessel 50 is set to a predetermined pressure.

  The predetermined pressure at this time is the pressure of the panel slightly lower than the pressure of the decompression vessel 50 when the panel is connected to the decompression vessel 50 by the air remaining in the panel or the piping before or during sealing. Since this is an increased value, this increased pressure is a pressure value set in advance.

  When simultaneously sealing a plurality of panels, as shown in a schematic cross-sectional view in FIG. 4, a plurality of panels (the joined front substrate 1 and rear substrate 2) are connected to the decompression vessel 50 with the piping system 15. Connect through. At this time, in order to realize that the panel internal pressure is made lower than the panel external pressure at a constant pressure regardless of the number of stacked panels, the pressure rising by connecting one panel to the decompression vessel 50 is increased. By setting the pressure lower by the number of panels that can be obtained in advance and finally the pressure you want to depressurize, the panel can always be depressurized at a constant pressure regardless of the number of stacked panels. Can be produced in large quantities.

  Moreover, it is preferable that the decompression force value of the decompression vessel 50 can be controlled to a predetermined value. In this state, if the panel internal pressure is continuously reduced by exhausting the pump while the sealing member is softened, the panel internal pressure gradually approaches 0, which causes a problem that the sealing member is drawn into the panel. Therefore, before connecting the panel and the decompression container, the decompression container 50 is once decompressed to near vacuum as shown in FIG. 3, and then the control valve 18 is controlled. While measuring with a meter, for example, after introducing the panel-filled gas to a predetermined pressure, the valve connecting the decompression vessel and the panel is opened. By doing so, the decompression force can be controlled to a predetermined value.

  Here, the pressure to be controlled is not the difference between the panel internal pressure and the panel external pressure. That is, the inside of the panel before sealing and the piping are at atmospheric pressure. Therefore, finally, when the pressure of the decompression vessel is adjusted with respect to the pressure to apply the pressing force over the entire panel surface, the pressure of the decompression vessel is increased by the pressure of the atmosphere remaining in the pipe and the panel. . Therefore, it is desirable to measure in advance the pressure increase due to the air remaining in the panel and the pressure increase due to the air remaining in the piping, and subtract from the pressure to be used as the pressing force to obtain the set pressure.

  As described above, according to the method for manufacturing a PDP according to an embodiment of the present invention, it is possible to make the panel internal pressure smaller than the panel external pressure at the time when the sealing member is softened, and to a predetermined pressure. Since the pressure can be adjusted, the front panel and the back panel can be pressed evenly and sealed, and the surrounding sealing member is not drawn into the panel due to excessive pressure reduction. Furthermore, when sealing a plurality of panels at the same time, the pressure can be adjusted to a predetermined pressure, so that a panel having a uniform gap and good display quality can be manufactured.

  As described above, the present invention is useful for providing a large-screen, high-definition PDP.

DESCRIPTION OF SYMBOLS 1 Front substrate 2 Back substrate 3 Address electrode 4 Electrode protective layer 5 Partition 5a Partition top 6 Phosphor 7 Discharge electrode 7a Transparent electrode 7b Metal electrode 8 Dielectric layer 9 Protective layer 10 Clip 11 Sealing member 12 Firing furnace 13 Pump 15 Piping System 15a Exhaust system 15b Gas introduction system 16 Piping 17 Piping fixing member 18 Control valve 20 Panel filled gas 50 Depressurized container

Claims (4)

In a method for manufacturing a plasma display comprising a step of sealing the outer peripheral portions of two substrates arranged opposite to each other with a sealing member, the pressure at which the panel internal pressure is smaller than the external pressure when the sealing member is softened A method of manufacturing a plasma display panel, characterized in that a difference is provided. 2. The method of manufacturing a plasma display panel according to claim 1, wherein the pressure difference is provided by connecting a pressure-reduced container whose pressure is adjusted to the panel. When producing a plurality of plasma display panels at the same time, the decompression container is connected to the decompression container after a part of the plurality of panels is adjusted, and then the remaining panels are connected to the decompression container. 3. The method for manufacturing a plasma display panel according to claim 2, wherein the pressure is adjusted again thereafter. 4. The method of manufacturing a plasma display panel according to claim 3, wherein the decompression container has a function of adjusting the pressure of the decompression container in accordance with the number of connected panels.

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