JP2009037846A - Flat display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the vibration of a panel due to an atmospheric pressure change during drive, or internal damage thereto due to vibration. <P>SOLUTION: A front face glass substrate 1 and a back face glass substrate 6 are opposed to each other via a discharge space S. A pair of row electrodes X, Y and a column electrode D are provided between the front face glass substrate 1 and the back face glass substrate 6, and an adhesive layer 5 is provided at a selective position for adhering the front face glass substrate 1 and the back face glass substrate 6 to each other. Surface reinforcing treatment is applied to at least the front face glass substrate 1 to produce compressive stress on the front face glass substrate 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure of a flat display panel.

  A plasma display panel (hereinafter referred to as “PDP”), which is one of flat display panels, generally has a discharge electrode provided between two glass substrates opposed to each other via a discharge space, and is in a sealed discharge space. A discharge gas containing xenon is enclosed in this, and this discharge space is divided into a plurality of discharge cells arranged in a matrix, and each discharge cell is color-coded into three primary colors of red, green, and blue. It has a configuration in which layers are formed.

  In the PDP, discharge is selectively generated by discharge electrodes in each discharge cell, and red, green, and blue phosphor layers emit light by vacuum ultraviolet rays generated from the discharge gas by this discharge, thereby displaying a matrix display. To form an image.

  In the PDP having such a configuration, conventionally, in order to reduce the weight and cost of the panel, it has been attempted to use a thin glass for the two glass substrates constituting the display surface and the back surface of the panel. .

  However, when thin glass is used for the two glass substrates facing each other across the discharge space, the panel strength is reduced, and the discharge gas is sealed in the discharge space at a required pressure. When used in places with low atmospheric pressure, such as high altitudes, the glass substrate swells due to the pressure of the discharge gas in the discharge space, creating unnecessary gaps with the internal structure of the panel, thereby driving the panel. Sometimes, the part where the gap is generated vibrates and generates noise, and the magnitude of the noise changes depending on the driving signal input to the panel, which is very uncomfortable for the viewer. Will end up.

  Further, when the PDP is disposed between two glass substrates and includes a partition wall that divides the discharge space for each discharge cell, the partition wall is damaged by the collision caused by the vibration generated when the panel is driven as described above. If there is a possibility that the partition wall is damaged, the discharge cells in that portion become a dark spot when the panel is driven, which causes the display quality to deteriorate.

  An object of the present invention is to solve the problems of the flat display panel including the conventional PDP as described above.

  In order to achieve the above object, a flat display panel according to the present invention is a flat display panel in which a front substrate and a rear substrate are opposed to each other through a sealed space, and a discharge electrode is provided between the front substrate and the rear substrate. And an adhesive layer for bonding the front substrate and the rear substrate is provided at an arbitrary position between the front substrate and the rear substrate, and compressive stress is generated on the front substrate at least with respect to the front substrate. It is characterized by a surface strengthening treatment.

  In the flat display panel according to the present invention, the front substrate and the rear substrate are opposed to each other through a sealed space, and a discharge electrode is provided between the front substrate and the rear substrate, and at any place between the front substrate and the rear substrate. The best is a flat display panel which is provided with an adhesive layer for bonding between the front substrate and the rear substrate, and at least a front surface substrate is subjected to a surface strengthening treatment that generates compressive stress on the front substrate. In this embodiment.

  In the flat display panel according to this embodiment, the front substrate and the back substrate are bonded and fixed to each other by an adhesive layer. Further, in the manufacturing process, at least the front substrate of the front substrate and the back substrate is subjected to a surface strengthening treatment. Compressive stress is generated by this to strengthen the strength and impact resistance of the panel.

  As a result, for example, a flat display panel using a thin front substrate is used in a place with low atmospheric pressure such as a high altitude, and the front substrate is moved outward by the pressure in the sealed space between the front substrate and the rear substrate. Even when trying to swell toward the front, the front substrate is prevented from being deformed, and the deformation of the front substrate as in the prior art creates an unnecessary gap inside the panel, causing vibration during driving. Generation of noise and damage inside the panel can be prevented.

  In the flat display panel of the above-described embodiment, at least the front substrate, which is a glass substrate containing sodium ions, is subjected to surface strengthening treatment by an ion exchange method in which sodium ions in the glass substrate are exchanged with potassium ions or lithium ions. preferable.

By the surface strengthening treatment by this ion exchange method, potassium ions having an ionic radius larger than that of sodium ions enter the surface of the glass substrate, thereby generating a compressive stress on the surface of the glass substrate and improving the strength of the front substrate. .
Such a surface strengthening treatment by an ion exchange method is performed, for example, by immersing the panel in potassium nitrate at 300 to 450 ° C. after the assembly of the panel is completed in the manufacturing process.

  In the flat display panel of the above-described embodiment, when the panel includes a partition wall that partitions a sealed space provided between the front substrate and the rear substrate to form a unit light emitting region, the panel is bonded onto the partition wall. Preferably, a layer is formed to adhere between the front and back substrates.

  Further, in this case, the adhesive layer covers the back surface of the dielectric layer formed on the back surface of the front substrate and is disposed between the protective layer facing the sealed space and the partition wall, It is preferable to adhere.

  As a result, an unnecessary gap is generated between the protective layer and the barrier ribs, and the barrier ribs are damaged due to vibration during driving and the unit light emitting area becomes a dark spot, thereby preventing display quality from being deteriorated. become.

  As an aspect of forming such an adhesive layer on the partition wall, an adhesive layer is formed along the horizontal wall and the vertical wall of the partition wall having the horizontal wall extending in the row direction and the vertical wall extending in the column direction, or in the row direction. A mode of forming along a horizontal wall of a partition wall having an extending horizontal wall, a mode of forming at any part of a portion where a horizontal wall extending in a row direction and a vertical wall extending in a column direction intersect with the vertical wall, There exists an aspect etc. which are arrange | positioned in the clearance gap between the substantially ladder-shaped partitions arranged in parallel in the row | line | column direction, and are adhere | attached on the side surface of a partition.

  When the adhesive layer is formed along the horizontal wall and the vertical wall of the partition wall having the horizontal wall extending in the row direction and the vertical wall extending in the column direction, the front substrate and the rear substrate can be firmly bonded, and the adhesive layer Formed along the horizontal wall of the partition wall having a lateral wall extending in the row direction, or any part of the intersection of the horizontal wall extending in the row direction and the vertical wall extending in the column direction and the vertical wall. In the case of forming, the amount of the adhesive material for forming the adhesive layer can be reduced, so that the amount of gas released from the adhesive layer by the sealing at the time of manufacture and the heating in the exhaust process can be reduced.

Moreover, when arrange | positioning an adhesive layer in the clearance gap between partition walls, a panel can be made thin by this adhesive layer.
A typical example of a flat display panel to which the present invention is applied is a plasma display panel.

  The present invention can be applied to various flat display panels having a pair of substrates opposed to each other through a sealed space. In the following description, a PDP is taken as an example.

  1 to 3 show an example of an embodiment of a PDP according to the present invention. FIG. 1 is a front view of the PDP in this example, FIG. 2 is a cross-sectional view taken along line VV in FIG. It is sectional drawing in the WW line of FIG.

  1 to 3, a plurality of row electrode pairs (X, Y) extend in the row direction (left and right direction in FIG. 1) on the back surface of the front glass substrate 1 constituting the display surface of the panel and in the column direction (see FIG. 1). 1 in the vertical direction).

  The row electrodes X and Y constituting the row electrode pair (X, Y) are arranged at equal intervals along the bus electrodes Xa and Ya, respectively, and the bus electrodes Xa and Ya made of metal, respectively. A plurality of transparent electrodes Xb, Yb extending from the bus electrodes Xa, Ya toward the paired row electrode and facing each other via the discharge gap g.

A black color extending in a strip shape in the row direction at a position between the row electrodes X and Y of the row electrode X and the Y bus electrodes Xa and Ya, which are adjacent to each other on the back surface of the front glass substrate 1. Alternatively, a dark light absorption layer 2 is formed.
Further, a dielectric layer 3 is formed on the back surface of the front glass substrate 1, and the row electrode pair (X, Y) and the light absorption layer 2 are covered with the dielectric layer 3.

A protective layer 4 made of high-purity crystal MgO is formed on the back surface of the dielectric layer 3, and the back surface of the dielectric layer 3 is covered with the protective layer 4.
An adhesive layer 5 having a required pattern is formed on the back surface of the protective layer 4.
The adhesive layer 5 will be described later in detail.

On the surface of the rear glass substrate 6 facing the front glass substrate 1 facing the front glass substrate 1 through the discharge space S, a plurality of column electrodes D extending in the column direction are arranged at equal intervals in the row direction. It is installed.
Further, a column electrode protective layer 7 is formed on the rear glass substrate 6 to cover the column electrode D.
A partition wall 8 is formed on the column electrode protective layer 7.

  The partition wall 8 is located at a position facing a middle position between the pair of horizontal walls 8A extending in the row direction at a position facing the bus electrodes Xa and Ya of each row electrode pair (X, Y) and the adjacent column electrode D. A plurality of vertical walls 8B extending in the column direction between the pair of horizontal walls 8A are formed in a substantially ladder shape, and the partition walls 8 are juxtaposed in the column direction via gaps SL extending in the row direction.

  The substantially ladder-shaped partition wall 8 causes the discharge space S between the front glass substrate 1 and the rear glass substrate 6 to face the transparent electrodes Xb and Yb that are paired in each row electrode pair (X, Y). The discharge cells C are formed by dividing each part into a square.

On each side surface of the horizontal wall 8A and the vertical wall 8B of the partition wall 8 facing the discharge cell C and on the surface of the column electrode protection layer 7, red, green, The phosphor layers 9 that are color-coded into the three primary colors of blue are arranged so that the red, green, and blue colors are arranged in order in the row direction.
In the discharge space S, a discharge gas containing xenon is sealed at a required pressure.

As shown in FIG. 4, the adhesive layer 5 described above is formed so as to have the same ladder pattern as the partition wall 8.
The entire back surface of the adhesive layer 5 (the surface facing the back glass substrate 6) is in contact with and adhered to the top surface of the partition wall 8 (the surface facing the front glass substrate 1). The entire surface (the surface facing the front glass substrate 1) is in contact with and bonded to the protective layer 4, whereby the front glass substrate 1 side and the back glass substrate 6 side are firmly fixed to each other. .

  Note that the adhesive layer 5 does not necessarily have to be adhered to the entire top surface of the partition wall 8. As shown in FIG. 4, the adhesive layer 5 has a width of each part of the horizontal wall 8A and the vertical wall of the partition wall 8. The front glass substrate 1 side and the rear glass substrate 6 side are more firmly fixed to each other as the bonding area between the adhesive layer 5 and the top surface of the partition wall 8 is larger. .

  The adhesive material for forming the adhesive layer 5 is a material that is immediately bonded to the protective layer 4 when the front glass substrate 1 and the rear glass substrate 6 are sealed, such as a seal frit or a dielectric material having a low softening point. In order to suppress the deterioration of MgO forming the protective layer 4, it is preferable to use a material that satisfies conditions such as a small amount of gas release when sealing the front glass substrate 1 and the back glass substrate 6.

Further, as the adhesive material for forming the adhesive layer 5, it is preferable to use a material whose color of the adhesive layer 5 becomes transparent or black after firing. When the black adhesive layer 5 is formed, A function as a light absorption layer for preventing reflection of external light incident on the non-display area can also be achieved.
Further, the PDP is subjected to a surface strengthening process for generating a compressive stress in the panel at the end of the manufacturing process.

FIG. 5 is a flowchart showing the flow of the manufacturing process of the PDP.
In FIG. 5, the formation of each structure on the front glass substrate 1 is performed in the manufacturing process A by the transparent electrode Xb, Yb forming process (A1) -the bus electrode Xa, Ya forming process (A2) -the light absorbing layer. 2 formation step (A3) -dielectric layer 3 formation step (A4) -protection layer 4 formation step (A5).

In the manufacturing process B, each structure is formed on the rear glass substrate 6 in the column electrode D forming step (B1) -the column electrode protective layer 7 forming step (B2) -the partition wall 8 forming step (B3) -fluorescence. The body layer 9 forming step (B4) -the adhesive layer 5 forming step (B5) -the sealing layer forming step (B6) are performed in this order.
In this manufacturing process B, the adhesive layer 5 formed on the top surface of the partition wall 8 is pre-fired simultaneously with the sealing layer formed on the peripheral edge of the rear glass substrate 6, whereby the adhesive layer 5 It is possible to prevent an increase in the pre-baking step in the manufacturing process B accompanying the formation of.

In the formation process (B5) of the adhesive layer 5, the application of the adhesive material onto the partition wall 8 is performed by screen printing or offset printing.
In the above, an example is shown in which the adhesive layer 5 is formed by applying an adhesive material on the top surface of the partition wall 8 in the manufacturing process B. However, the adhesive layer 5 is protected in the manufacturing process A. On the back surface of the layer 4, an adhesive material may be applied to a substantially ladder pattern corresponding to the pattern of the partition wall 8.

  The front glass substrate 1 and the rear glass substrate 6 on which the respective structures are formed through the manufacturing processes A and B are aligned with each other through the superposition process C1 and the sealing / exhaust process C2 in the manufacturing process C. The discharge space S is sealed by being overlapped in a state.

In the sealing / exhaust process C2 of the manufacturing process C, the front glass substrate 1 and the rear glass substrate 6 are bonded to each other by the adhesive layer 5. The front glass substrate 1 and the rear glass substrate are formed by the sealing layer formed on the rear glass substrate 6. This is done simultaneously with the 6 sealing.
After completion of the manufacturing process C, a surface strengthening process D for generating a compressive stress on the surfaces of the front glass substrate 1 and the back glass substrate 6 is performed on the panel that has been assembled.

In this embodiment, a surface strengthening treatment method by ion exchange treatment is used for the surface strengthening treatment in the surface strengthening treatment step D.
In general, the surface strengthening treatment of a glass plate includes a physical strengthening method for rapidly cooling glass and a chemical strengthening method by ion exchange treatment. However, a glass substrate having a thickness of 3 mm or less, which is usually used for PDP, is used. In order to generate sufficient compressive stress, the chemical strengthening method by ion exchange treatment seems to be suitable.

Usually, glass substrates such as soda lime glass and PD200 are used for PDP, and sodium ions are present in these glass substrates.
When this glass substrate is immersed in a potassium salt such as potassium nitrate or potassium nitrite, ion exchange occurs between sodium ions in the glass substrate and potassium ions in the potassium salt.

When potassium ions having an ion radius larger than that of sodium ions enter the surface of the glass substrate, compressive stress is generated on the surface of the glass substrate, and the strength of the glass substrate is improved.
For this reason, the surface strengthening treatment in the surface strengthening treatment step D is performed, for example, by immersing the panel after the completion of the production step C in potassium nitrate at 300 to 450 ° C., whereby potassium ions of potassium nitrate ( K +) and the sodium ions (Na +) of the front glass substrate 1 and the rear glass substrate 6 cause ion exchange to generate compressive stress on the surfaces of the front glass substrate 1 and the rear glass substrate 6, thereby increasing the panel strength. Is improved.

  In this surface strengthening treatment, lithium salt may be used in place of potassium salt. In this case, ion exchange occurs between sodium ions in the glass substrate and lithium ions in the lithium salt, and the front glass is similarly formed. Compressive stress is generated on the surfaces of the substrate 1 and the back glass substrate 6 to improve the panel strength.

It should be noted that the discharge gas sealing in the discharge space S and the tip-off of the gas introduction tube may be performed either before or after the surface strengthening treatment step D.
Further, this surface strengthening treatment may be performed only on the front glass substrate 1 side.

  Further, this surface strengthening treatment may be performed simultaneously with the sealing / exhaust step C2, and in this case, the time of the manufacturing process can be shortened, but the effect of the surface strengthening treatment is reduced by the heat treatment. It is preferable to be performed after the end of the sealing / exhaust step C2 involving.

  In the PDP, the top surface of the partition wall 8 and the protective layer 4 are bonded to each other by the adhesive layer 5 and fixed to each other, and further, the surface strengthening process is performed in the final step of the manufacturing process, whereby the front glass substrate 1 Since the compressive stress is generated in the back glass substrate 6 and the strength and impact resistance of the panel are enhanced, for example, even when thin glass is used for the front glass substrate 1 or the back glass substrate 6, the PDP is high-altitude. When the pressure is low, the front glass substrate 1 swells due to the pressure of the discharge gas, and an unnecessary gap is generated between the structure on the front glass substrate side and the barrier rib as in the prior art. Can be prevented.

  As a result, unnecessary vibrations are prevented from being generated inside the panel during driving, and the partition wall 8 is damaged and chipped due to generation of noise or collision due to vibration. It becomes possible to prevent damage from the inside of the panel such as cracking.

FIG. 6 is a pattern diagram showing a modification of the adhesive layer of the PDP in the above embodiment.
In the above embodiment, as shown in FIG. 4, an example in which the adhesive layer 5 is formed in a substantially ladder pattern on the horizontal wall 8A and the vertical wall 8B of the partition wall 8 is shown. Then, only on the lateral wall 8A of the partition wall 8, the strip-like adhesive layers 15 extending in the row direction are formed.

  According to the example of FIG. 6, the amount of the adhesive material used can be reduced as compared with the case where the adhesive layer is formed in a ladder pattern as shown in FIG. The amount of gas released from the adhesive layer by heating in can be reduced as compared with the example of FIG.

FIG. 7 is a pattern diagram showing another modification of the PDP adhesive layer in the above embodiment.
In the embodiment, as shown in FIG. 4, the partition wall 8 is formed in a substantially ladder shape, and the adhesive layer 5 is formed in a substantially ladder pattern on the horizontal wall 8A and the vertical wall 8B of the partition wall 8. On the other hand, in the example of FIG. 7, the partition wall 18 is formed in a substantially lattice shape, and the adhesive layer 25 is formed in a spot shape on an arbitrary intersecting portion 18a of the horizontal wall 18A and the vertical wall 18B.

In the example of FIG. 7, an adhesive layer 25 is formed for each intersection 18 a sandwiching three discharge cells C in the row direction and for each intersection 18 a in the column direction.
According to the example of FIG. 7, the amount of the adhesive material used can be reduced as compared with the case of the example of FIG. 6, whereby the gas released from the adhesive layer by heating in the sealing / exhaust process C <b> 2. The amount can be further reduced, and it is also possible to cope with a high definition PDP such as full HD.

FIG. 8 is a pattern diagram showing another modification of the adhesive layer of the PDP in the embodiment.
In each of the above embodiments, the adhesive layer is disposed between the top surface of the partition wall and the protective layer, whereas in the example of FIG. 8, the adhesive layer 35 is substantially arranged in the column direction. It is disposed at a position facing the gap SL (see FIG. 1) formed between the ladder-shaped partition walls 8 and bonded to the outer surface of the lateral wall 8A of the partition wall 8 and the protective layer 4.

According to the example of FIG. 8, the PDP can be thinned by arranging the adhesive layer 35 in the gap SL between the partition walls 8.
In the PDP of the above embodiment, the front substrate and the rear substrate are opposed to each other through a sealed space, a discharge electrode is provided between the front substrate and the rear substrate, and this is disposed at an arbitrary position between the front substrate and the rear substrate. The flat display panel according to the embodiment, in which an adhesive layer for bonding between the front substrate and the rear substrate is provided, and at least the front substrate is subjected to a surface strengthening treatment that generates compressive stress on the front substrate. It is an embodiment of the superordinate concept.

  In the flat display panel according to this embodiment, the front substrate and the rear substrate are bonded and fixed to each other by an adhesive layer, and further, at least the front substrate and the rear substrate are compressed by a surface strengthening process in the manufacturing process. The generation of stress enhances the strength and impact resistance of the panel.

  As a result, for example, a flat display panel using a thin front substrate is used in a place with a low atmospheric pressure such as a high altitude, and the front substrate faces outward due to the pressure in the sealed space between the front substrate and the rear substrate. Even when trying to swell, the front substrate is prevented from being deformed, and the noise caused by the generation of vibration during driving due to an unnecessary gap inside the panel due to the deformation of the front substrate as in the past. And the occurrence of damage inside the panel can be prevented.

It is a front view which shows PDP in one Example of this invention. It is sectional drawing in the VV line of FIG. It is sectional drawing in the WW line of FIG. It is a top view which shows the formation pattern of the contact bonding layer in the Example. It is a flowchart which shows the manufacturing process of PDP in the Example. It is a top view which shows the other formation pattern of the contact bonding layer in the Example. It is a top view which shows other formation pattern of the contact bonding layer in the Example. It is a top view which shows other formation pattern of the contact bonding layer in the Example.

Explanation of symbols

1 ... Front glass substrate (front substrate)
3 ... Dielectric layer 4 ... Protective layer 5, 15, 25, 35 ... Adhesive layer 6 ... Back glass substrate (back substrate)
8, 18 ... partition wall 8A, 18A ... horizontal wall 8B, 18B ... vertical wall X, Y ... row electrode (discharge electrode)
Xa, Ya ... bus electrode Xb, Yb ... transparent electrode D ... column electrode

Claims (10)

In a flat display panel in which a front substrate and a rear substrate are opposed to each other through a sealed space, and a discharge electrode is provided between the front substrate and the rear substrate,
An adhesive layer for bonding between the front substrate and the rear substrate is provided at an arbitrary position between the front substrate and the rear substrate, and at least a surface reinforcement that causes compressive stress to the front substrate with respect to the front substrate. A flat display panel characterized by being treated.   The flat display panel according to claim 1, wherein at least the front substrate of the front substrate and the rear substrate is a glass substrate containing sodium ions, and the surface strengthening treatment is treatment by an ion exchange method.   The flat display panel according to claim 2, wherein sodium ions in the glass substrate are exchanged with potassium ions or lithium ions by the ion exchange method.   2. The flat display panel according to claim 1, wherein a partition wall is provided between the front substrate and the rear substrate so as to partition a sealed space to form a unit light emitting region, and an adhesive layer is formed on the partition wall.   The flat display panel according to claim 4, wherein the partition wall has a horizontal wall extending in the row direction and a vertical wall extending in the column direction, and an adhesive layer is formed along the horizontal wall and the vertical wall of the partition wall.   The flat display panel according to claim 4, wherein the partition wall has a lateral wall extending in a row direction, and an adhesive layer is formed along the lateral wall of the partition wall.   5. The partition wall according to claim 4, wherein the partition wall has a horizontal wall extending in the row direction and a vertical wall extending in the column direction, and an adhesive layer is formed at any portion of the partition wall where the horizontal wall and the vertical wall intersect. Flat display panel.   A substantially ladder-shaped partition wall is provided between the front substrate and the rear substrate to form a unit light-emitting region by dividing a sealed space, and the partition walls are arranged in parallel in a column direction via a gap extending in the row direction. The flat display panel according to claim 1, wherein the layer is disposed in a gap between the partition walls and adhered to a side surface of the partition wall.   A discharge electrode is formed on the back surface of the front substrate and a dielectric layer is formed covering the discharge electrode. A protective layer is formed on the back surface of the dielectric layer so as to face the sealed space and cover the dielectric layer. The flat display panel according to claim 4, wherein an adhesive layer is disposed between the protective layer and the partition wall to bond the protective layer and the partition wall.   The flat display panel according to claim 1, wherein the flat display panel is a plasma display panel.

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