JP2007287408A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PDP of high resolution in which migration of metallic ions by an electric field is suppressed in a data electrode terminal part for impressing drive voltage on the data electrode and which has a high yield of manufacture. <P>SOLUTION: The PDP has a front substrate of which on one face a plurality of display electrode pairs are formed and a rear substrate 3 of which on one face a plurality of data electrodes and barrier ribs to demarcate a discharge space are formed, arranged so that the display electrode pairs and the data electrodes may be arranged oppositely to cross each other and, of which surrounding parts are sealed by a sealing member. Data electrode terminals 32 to connect an external drive circuit and the data electrodes are installed at the outer periphery end part of the sealing member of the rear substrate 3, and projection parts 36 composed of an insulating member are provided between each data electrode terminals 32. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plasma display panel, and in particular, provides a highly reliable plasma display panel by suppressing migration of metal ions due to electric field concentration at a data electrode terminal portion.

  A plasma display panel (hereinafter abbreviated as “PDP”) has a structure in which a front substrate and a rear substrate are arranged to face each other and the periphery thereof is sealed with a sealing member, and is formed between the front substrate and the rear substrate. The discharge space is filled with a discharge gas such as neon and xenon.

  The front substrate includes a display electrode pair formed in a stripe shape on one surface of a glass substrate, and a dielectric layer and a protective film covering the display electrode pair. The back substrate is a stripe-shaped data electrode formed on one side of a glass substrate, a base dielectric layer that covers these data electrodes, and a base dielectric layer that forms a discharge space for each data electrode. And a red, green, and blue phosphor film formed on the underlying dielectric layer between the barrier ribs and on the side walls of the barrier ribs.

  The front substrate and the rear substrate are disposed so as to face each other so that the display electrode pair and the data electrode are orthogonal to each other, and a crossing portion of these electrodes is a discharge cell. These discharge cells are arranged in a matrix, and three discharge cells having red, green, and blue phosphor films arranged in the direction of the display electrode pair form pixels for color display.

  A plurality of display electrode pairs formed on the front substrate and a plurality of data electrodes formed on the rear substrate are connected to connection electrodes of the external drive circuit via respective data electrode terminals provided on the outer periphery of the display area. ing. FIG. 7 is a diagram showing a configuration of the data electrode terminal portion 33 provided on the back substrate 3 of the conventional PDP, and is connected to the plurality of data electrodes 22, the data electrode terminal portion 33, and the data electrode terminal portion 33. A connection structure of a flexible substrate (hereinafter abbreviated as FPC) 34 is shown. FIG. 7A is a plan view showing the structure of all data electrode terminal portions 33 together with the back substrate 3 of the PDP. FIG. 7B is a cross-sectional view of one data electrode terminal portion 33. A frame-shaped sealing member 60 is provided on the back substrate 3, and the inside of the sealing member 30 is an image display region. As shown in FIG. 7A, a plurality of data electrode terminal portions 33 are provided on the upper long side of the outer peripheral portion of the back substrate 3, and each data electrode is connected to one data electrode terminal portion 33 by a lead wire 35. A plurality of data electrode terminals 32 connected to 22 are assembled.

  An FPC 34 provided with a connection terminal 37 is crimped and electrically and mechanically connected to each data electrode terminal 32 of the data electrode terminal portion 33. As a result, the drive voltage from the external drive circuit is applied to the data electrode 22 via the connection terminal 37 and the data electrode terminal 32. Since it is necessary to attach the FPC 34 to the data electrode terminal 32 on the back substrate 3, the width (Wt) of the data electrode terminal portion 33 is smaller than the width (Wf) of the FPC 34. That is, the pitch of the plurality of data electrode terminals 32 assembled in the data electrode terminal portion 33 is smaller than the pitch of the data electrodes 22 in the image display area. Therefore, the lead line 35 is formed so as to narrow down the center line of the FPC 34 symmetrically from the data electrode 22 side toward the data electrode terminal 32 side. That is, the line width and line interval of the data electrode terminal 32 are smaller than the line width and line interval of the data electrode 22.

  On the other hand, as shown in FIG. 7B, the data electrode terminal 32 on the back substrate 3 and the connection terminal 37 of the FPC are pressure-bonded with an anisotropic conductive sheet (abbreviated as ACF) 38 interposed therebetween. The data electrode terminal 32 and the connection terminal 37 are directly connected by the metal particles 39 in the ACF 38, and the gap between the back substrate 3 and the FPC 34 is filled with the metal particles 39 and the binder resin to maintain the mechanical strength. The data electrode terminal 32 is produced by a method of producing a conductive paste made of silver (Ag) or the like by screen printing, or a method of patterning by a photolithography method after forming a film of an electrode material on the back substrate 3. .

  As the number of data electrodes 22 increases and the line width or line interval decreases with the increase in definition of the PDP, the electric field strength due to the applied voltage becomes maximum between adjacent data electrode terminals 32. As a result, migration of Ag ions occurs, causing a short circuit failure between adjacent data electrode terminals 32.

As an example of suppressing migration at these data electrode terminal portions, a method of changing the shape of the lead line from the data electrode has been proposed (see, for example, Patent Document 1).
JP 2001-283737 A

  The demand for the resolution of the PDP is high, and a higher resolution is required for a high-definition television than for a VGA (Video Graphics Array) display. For example, in a high-definition PDP of 50 inches or more, the data electrode has a line width of 100 μm, a line width of 150 μm, and a data electrode terminal has a line width of 80 μm and a line width of 135 μm. Further, it is assumed that higher accuracy can be achieved even with a PDP having a smaller size. In this case, the line width of the data electrode terminals is assumed to be narrower than 80 μm.

  When the line width between the data electrode terminals is narrowed, a large electric field is generated by the voltage applied between the data electrode terminals, and dielectric breakdown occurs due to migration of metal ions as the operation time elapses. In other words, as the resolution of the display screen becomes higher, the pitch of the data electrode terminals becomes narrower, and it becomes necessary to reduce the interval between the data electrode terminals, thereby increasing the electric field generated between the data electrode terminals and causing migration of metal ions. Insulation breakdown due to Further, as the pitch becomes narrower, it becomes difficult to align the data electrode terminals formed on the back substrate and the connection terminals of the flexible substrate, thereby reducing the manufacturing yield.

  The present invention solves such a problem by devising the structure of the data electrode terminal part, and provides a high-resolution PDP with high manufacturing yield while suppressing migration of metal ions due to an electric field. Objective.

  In order to solve the above-described problems, a PDP according to the present invention includes a front substrate having a plurality of display electrode pairs formed on one surface, and a partition that divides a plurality of data electrodes and a discharge space on one surface. And a rear substrate on which the display electrode pair and the data electrode are orthogonal to each other, and the periphery of the PDP is sealed with a sealing member, and the outer periphery of the sealing member of the rear substrate A data electrode terminal portion for connecting the external drive circuit and the data electrode is provided at the end, and a convex portion made of an insulating member is provided between the data electrode terminals of the data electrode terminal portion.

  According to such a configuration, even if the pitch of the data electrode terminals is narrowed, the projection provided between the data electrode terminals suppresses the migration of metal ions caused by the application of the drive voltage, and thus between the data electrode terminals. Therefore, it is possible to realize a highly reliable high-definition PDP.

  Furthermore, it is desirable that the convex portion is made of the same material as the partition wall, and the convex portion can be formed simultaneously with the formation of the partition wall, so that the manufacturing process can be simplified.

  Furthermore, the data electrode terminal is connected to the connection terminal formed on the flexible substrate through anisotropic conductive particles, and the height of the convex portion is made larger than the sum of the thickness of the data electrode terminal and the thickness of the connection terminal. Is desirable. According to such a configuration, the data electrode terminal and the connection terminal are connected in a form in which the convex portion is fitted between the connection terminals provided on the flexible substrate, the alignment accuracy of both is improved, and the manufacturing yield is increased. be able to.

  The PDP of the present invention includes a front substrate having a plurality of display electrode pairs formed on one surface, and a back substrate having a plurality of data electrodes and a partition wall separating discharge spaces formed on one surface. The display electrode pair and the data electrode are opposed to each other so as to be orthogonal to each other, and the peripheral portion thereof is sealed with a sealing member, and an external driving circuit and the data electrode are provided at the outer peripheral end of the sealing member of the rear substrate. Are provided, and a recess is provided in the back substrate between the data electrode terminals of the data electrode terminal portion.

  According to such a configuration, even if the pitch of the data electrode terminals is narrowed, the recesses provided between the data electrode terminals extend the distance that the metal ions move by the electric field across the glass and adhesive resin interface of the back substrate, and migrate. It is possible to suppress the dielectric breakdown between the data electrode terminals and realize a highly reliable high-definition PDP.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing the migration of the metal ion by an electric field in a data electrode terminal part, high resolution PDP with a high manufacturing yield can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is an exploded perspective view of an AC surface discharge type PDP. A PDP 1 is composed of a front substrate 2 made of a transparent glass substrate and the like and a rear substrate 3 made of a glass substrate and the like. A plurality of discharge cells 4 are formed between the rear substrate 3 and the rear substrate 3. On the front substrate 2, a plurality of display electrode pairs 15 including scan electrodes 13 and sustain electrodes 14 covered with a dielectric layer 11 and a protective layer 12 are arranged in parallel. The scanning electrode 15 includes a transparent electrode 16 that transmits visible light and a bus electrode 17 that serves to lower the resistance of the electrode. Similarly, the sustain electrode 14 includes a transparent electrode 18 and a bus electrode 19.

  On the other hand, on the back substrate 3, a plurality of data electrodes 22 covered with the base dielectric layer 21 are arranged in parallel to each other in a direction orthogonal to the display electrode pair 15. A partition wall 23 for partitioning the discharge space for each data electrode 22 is provided between the adjacent data electrodes 22. Further, a phosphor layer 24 is formed on the base dielectric layer 21 and on the side surfaces of the barrier ribs 23. The discharge cell 4 is filled with, for example, neon or xenon as a gas that emits ultraviolet rays by discharge. And the fluorescent substance layer 24 is excited by the ultraviolet-ray which generate | occur | produces by the discharge in the discharge cell 4, a visible light of three primary colors is generated, and a color image is displayed.

  As described above, in the PDP 1, the front substrate 2 and the rear substrate 3 are arranged to face each other, and the discharge cells 4 arranged in a matrix in the gap constitute an image display region. The outer peripheral portions of the front substrate 2 and the rear substrate 3 are sealed with a sealing member (not shown) such as a glass frit. In order to apply a driving voltage from an external driving circuit to the display electrodes 15 and the data electrodes 22 formed on the front substrate 2 and the rear substrate 3, electrode terminal portions (not shown) are provided on the outer peripheral ends of the front substrate 2 and the rear substrate 3. The electrode terminal and the connection terminal of the FPC are pressure-bonded via an anisotropic conductive film (ACF) and connected to an external drive circuit.

  FIG. 2 is a plan view of the back substrate 3 of the PDP according to the first embodiment of the present invention. In order to show details of the data electrodes 22 and the data electrode terminal portions 30, the partition walls that divide the discharge space are omitted. is doing. Further, FIG. 2 has the same basic configuration as FIG. 7A shown as a conventional example. In the image display region 31 surrounded by the frame-shaped sealing member 33, a plurality of data electrodes 22 covered with the base dielectric layer 21 are formed in stripes. For the data electrode 22 and the data electrode terminal 32, a method of producing a conductive paste made of silver (Ag) or the like by screen printing, a method of patterning by a photolithography method after forming a film of an electrode material on the back substrate 3, etc. It is produced by. In the high-definition PDP in the embodiment of the present invention, the number of data electrodes 22 is 5760, the line width is 100 μm, the line width is 150 μm, and the pitch of the data electrodes 22 is designed to be 250 μm.

  As shown in FIG. 2, the data electrode terminals 32 for the plurality of data electrodes 22 are divided into the plurality of data electrode terminal portions 30 on the upper long side of the outer peripheral end portion on the back substrate 3. The data electrode terminal 32 provided in the data electrode terminal portion 30 is not covered with the base dielectric layer and is exposed on the glass substrate of the back substrate 3. One FPC 34 is crimped to each data electrode terminal portion 30. In the embodiment of the present invention, since 15 FPCs 34 are used, 384 data electrode terminals 32 are connected to connection terminals on one FPC 34 surface. Since a margin is required for crimping the FPC 34, the width of the data electrode terminal portion 30 is narrower than the width of the FPC 34. Therefore, the line width and the line width of the data electrode terminal 32 are narrower than the line width and the line width of the data electrode 22. In the embodiment of the present invention, the data electrode terminals 32 are designed to have a line width of 60 μm, a line width of 80 μm, and a pitch of the data electrode terminals 32 of 140 μm. The 384 data electrodes 22 are narrowed down by the lead wire 35 and connected to the same number of connection terminals of the FPC 34 formed in one terminal portion 30.

  FIG. 3 is a diagram showing a configuration of the data electrode terminal unit 30 provided on the rear substrate of the PDP in the first embodiment of the present invention, and FIG. 3A is an enlarged plan view of the data electrode terminal unit 30. FIG. 3B is a sectional view thereof. As shown in FIG. 3, a convex portion 36 made of an insulating material and made of the same material as the partition is provided between the data electrode terminals 32. Further, as shown in FIG. 3A, the convex portion 36 may be provided not only between the data electrode terminals 32 but also extended to the lead wire 35 side from the data electrode 22. As shown in FIG. 3B, the back substrate 3 having the projections 36 formed between the data electrode terminals 32 and the FPC 34 are bonded by an anisotropic conductive sheet 38 and formed on the data electrode terminals 32 and the FPC 34 surface. The connected terminal 37 is electrically connected by the conductive powder 39 in the anisotropic conductive sheet 38. Further, these regions are mold-protected with a sealing resin.

  FIG. 4 is a view showing a part of the manufacturing process of the back substrate 3 of the PDP in the embodiment of the present invention, FIG. 4A is a view showing the manufacturing process of the partition wall 23 in the image display area, and FIG. FIG. 6 is a diagram showing a manufacturing process of the data electrode terminal portion 32. As shown in FIG. 4A, the data electrode 22 is formed on the back substrate 3, and the base dielectric layer 21 is formed on the surface thereof. The partition wall 23 is formed by applying a film of the partition walls 41 and 42 having a two-layer structure on the entire surface by a photolithography method.

  As shown in FIG. 4B, the data electrode terminal portion 30 is formed at the same time as the data electrode 22 in FIG. 4A, and thereafter, the partition material for the second layer in the image display region between the data electrode terminals 32. The protrusions 36 can be formed by applying the coating 42 and patterning the partition wall 23 at the same time.

  By this step, the second-layer partition wall 42 is formed on the first-layer partition wall 41, and the convex portion 36 is formed between the data electrode terminals 32 of the data electrode terminal portion 30. Next, the partition walls 23 and the projections 36 are fired and solidified by firing at a predetermined temperature. As a result, the convex portion 36 is formed of the same glass material as that of the partition wall 23 having good insulating properties, and an additional process is not required for forming the convex portion 36.

  Therefore, according to the first embodiment of the present invention, the convex portions 36 provided between the data electrode terminals 32 block silver ions from migrating due to an electric field at the sealing resin / glass interface and the ACF / glass interface. . That is, the migration path of the metal ions constituting the data electrode terminal 32 is extended by the convex portion 36, so that the electric field strength is reduced and the migration of the metal ions is suppressed, thereby suppressing defects due to a short circuit between the data electrode terminals 32. Can do.

  Further, as shown in FIG. 3B, the height of the convex portion 36 is formed higher than the sum of the thickness of the data electrode terminal 32 and the thickness of the connection terminal 37 of the FPC 34. Thereby, in the process of arranging and pressing the FPC 34 so as to face each other, the convex portion 36 can be fitted between the connection terminals 37 of the FPC 34 as shown in FIG. As a result, the manufacturing accuracy can be improved by suppressing the connection failure and the like.

(Second Embodiment)
FIG. 5 is a diagram showing a configuration of the data electrode terminal portion 30 provided on the rear substrate of the PDP in the second embodiment of the present invention, and FIG. 3A is an enlarged plan view of the data electrode terminal portion 30, and FIG. 3 (b) is a sectional view thereof. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. As in the case of the first embodiment, the terminal electrode 32 is formed of a conductive paste made of silver (Ag) or the like by a screen printing method or the like. In the embodiment of the present invention, a sandblasting method or the like is used for the back substrate 3 between the data electrode terminals 32, and the concave portions 50 are provided substantially parallel to the data electrode terminals 32. The recess 50 can increase the distance at which the silver metal ions move between the sealing resin / glass interface between the data electrode terminals 32. An arbitrary shape is conceivable as the cross-sectional shape of the recess 50, and may be, for example, an inverted triangular shape as shown in FIG. 6 or a rectangular shape. Since the silver (Ag) ions constituting the data electrode terminal 32 migrate at the interface between the sealing resin and the substrate glass, the transition path of silver ions is extended by providing the recess 50 between the data electrode terminals 32. Electric field strength is reduced. As a result, migration of silver ions is suppressed, and defects due to a short circuit between the data electrode terminals 32 are suppressed.

  In the first and second embodiments of the present invention, the line width and the line width of the data electrode terminal 32 are both designed to be narrower than the line width and the line width of the data electrode 22. It was. However, when the data electrode terminal 32 and the data electrode 22 have the same line width and only the line width of the data electrode terminal 32 is narrow, or the data electrode terminal 32 and the data electrode 22 have the same line width, the data electrode The present invention can also be applied when only the line width of the terminal 32 is narrow.

  In the above description, the data electrode 22 of the rear substrate 3 has been described. However, the same effect can be obtained by applying the present invention to the terminal portion that connects the display electrode 15 of the front substrate 2 to the outside.

  As described above, according to the present invention, migration of metal ions due to an electric field can be suppressed, and a high-resolution PDP with a high manufacturing yield can be provided, which is useful for a high-definition image display device.

An exploded perspective view of an AC surface discharge type PDP The top view of the back substrate of PDP in the 1st Embodiment of this invention The figure which shows the structure of the data electrode terminal part provided in the back substrate of the PDP The figure which shows a part of manufacturing process of the back substrate of the PDP The figure which shows the structure of the data electrode terminal part provided in the back substrate of PDP in the 2nd Embodiment of this invention. The figure which shows another structure of the data electrode terminal part provided in the back substrate The figure which shows the structure of the data electrode terminal part provided in the back substrate of the conventional PDP.

Explanation of symbols

1 PDP
2 Front substrate 3 Back substrate 4 Discharge cell 11 Dielectric layer 12 Protective layer 13 Scan electrode 14 Sustain electrode 15 Display electrode pair 16, 18 Transparent electrode 17, 19 Bus electrode 21 Base dielectric layer
22 Data electrode 23 Bulkhead 24 Phosphor layer 30 Data electrode terminal portion 31 Image display area 32 Data electrode terminal 33, 60 Sealing member 34 FPC
35 Lead wire 36 Convex part 37 Connection terminal 38 ACF
39 Metal particle 41 First layer partition 42 Second layer partition 50 Recess

Claims (4)

A front substrate having a plurality of display electrode pairs formed on one surface, and a back substrate having a plurality of data electrodes and partition walls separating discharge spaces formed on one surface, the display electrode pairs and the data A plasma display panel which is disposed so as to face each other so as to be orthogonal to each other and its periphery is sealed with a sealing member, and an external drive circuit and the data electrode are provided at an outer peripheral end of the sealing member on the back substrate. A plasma display panel, comprising: a data electrode terminal portion for connecting the first electrode portion; and a convex portion formed of an insulating member between the data electrode terminal portions of the data electrode terminal portion. The plasma display panel according to claim 1, wherein the convex portion is made of the same material as the partition wall. The data electrode terminal is connected to a connection terminal formed on a flexible substrate through anisotropic conductive particles, and the height of the convex portion is larger than the sum of the thickness of the data electrode terminal and the thickness of the connection terminal. The plasma display panel according to claim 1, wherein the plasma display panel is a plasma display panel. A front substrate having a plurality of display electrode pairs formed on one surface, and a back substrate having a plurality of data electrodes and partition walls separating discharge spaces formed on one surface, the display electrode pairs and the data A plasma display panel which is disposed so as to face each other so as to be orthogonal to each other and its periphery is sealed with a sealing member, and an external drive circuit and the data electrode are provided at an outer peripheral end of the sealing member on the back substrate. A plasma display panel, comprising: a data electrode terminal portion for connecting to the back electrode; and a recess formed in the back substrate between the data electrode terminals of the data electrode terminal portion.

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