JP4333086B2 - Plasma display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plasma display device known as a thin, lightweight display device having a large screen.
[0002]
[Prior art]
A plasma display device is capable of high-speed display compared to a liquid crystal panel, has a wide viewing angle, is easy to increase in size, and is self-luminous, so that the display quality is high. Recently, it has attracted particular attention in technology.
[0003]
In general, in this plasma display device, an ultraviolet ray is generated by gas discharge, and a phosphor is excited by the ultraviolet ray to emit light to perform color display. And the display cell divided by the partition on the board | substrate is provided, and it has the structure by which the fluorescent substance layer is formed in this.
[0004]
This plasma display device is roughly classified into an AC type and a DC type in terms of driving, and there are two types of discharge types: a surface discharge type and a counter discharge type, but high definition, large screen, and simple manufacturing are possible. Therefore, at present, the mainstream of plasma display devices is a surface discharge type of a three-electrode structure, and the structure has a pair of display electrodes adjacent in parallel on one substrate, and on the other substrate. It has an address electrode arranged in a direction intersecting with the display electrode, a partition wall, and a phosphor layer. The phosphor layer can be made relatively thick and is suitable for color display using a phosphor.
[0005]
In such a plasma display device, in order to supply a display signal from the drive circuit to each electrode of the panel, a connection terminal connected to each electrode is provided at an end portion of the substrate, and a flexible substrate (hereinafter, referred to as “a flexible substrate”) is provided through this connection terminal. The display signal is input using the FPC). The FPC is connected to the panel by using an anisotropic conductive film (hereinafter referred to as ACF), and the FPC is thermocompression bonded through the ACF to join the connection terminal and the FPC wiring conductor. is there.
[0006]
[Problems to be solved by the invention]
By the way, in this plasma display device, silver, copper, aluminum, and alloys thereof are used as the panel electrode material. Especially, in the case of the silver electrode, migration easily occurs when moisture is present during voltage application. It causes insulation failure between the terminals and deteriorates display reliability.
[0007]
Therefore, the entire connection terminal portion including the portion to which the FPC is connected is covered with a moisture-proof resin. However, when applying the moisture-proof resin onto the connection terminal, there is a bubble in the gap between the bonded portions of the two substrates. There is a problem that a situation in which migration of silver electrodes easily occurs is created.
[0008]
The present invention has been made in view of such problems, and an object of the present invention is to prevent migration of electrodes and connection portions and improve the reliability of a plasma display device.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a plasma display device according to the present invention has a pair of first and second substrates facing each other so that a discharge space is formed therebetween, and a peripheral portion is sealed with a low-melting glass frit. A panel body in which a plurality of discharge cells are formed by arranging electrodes on the substrate so that discharge is generated in the discharge space and sealed by a sealing member, and an end of the second substrate of the panel body is sealed and sealed A plurality of connection terminals provided on the extension part extended to the outside of the member and connected to the electrode; a flexible substrate having wiring connected to the connection terminal and attached to the extension part; and and a resin layer formed on the extending portion of the second substrate so as to cover the connection portion between the connection terminals of the flexible substrate, the sealing seal member from said end portion of the first substrate first Extension side of the board of 2 The protruding portion is 1 mm or less from the end portion of the first substrate, and the resin layer covers the connection portion with the connection terminal of the flexible substrate, The range from the end of the first substrate to the upper surface of the flexible substrate including the exposed portion of the sealing seal member of the panel body, and the range from the second substrate end of the panel body to the lower surface of the flexible substrate It is formed in the extension part of the second substrate so as to be applied to the surface, and when applying the resin to be coated on the connection terminal including the flexible substrate, it is as much as possible that bubbles are mixed in the applied resin. Can be prevented.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
That is, the invention according to claim 1 of the present invention is a sealing and sealing member in which a pair of first and second substrates are opposed to each other so that a discharge space is formed therebetween, and a peripheral portion is made of a low melting point glass frit. A panel body in which electrodes are arranged on the substrate so as to generate a discharge in the discharge space to form a plurality of discharge cells, and an end portion of the second substrate of the panel body is connected to a sealing seal member. A plurality of connection terminals that are provided in an extension part that extends outward and are connected to the electrode, a flexible board that has wiring connected to the connection terminal and is attached to the extension part, and the flexible board said connection terminal and the connecting portion and a resin layer formed on the extending portion of the second substrate so as to cover, the sealing seal member, the second from the end of the first substrate Formed so that it protrudes to the extended side of the substrate The protruding portion is 1 mm or less from the end of the first substrate, and the resin layer covers the connection portion with the connection terminal of the flexible substrate, and the sealing of the panel body It is applied to the range from the end of the first substrate to the upper surface of the flexible substrate including the exposed portion of the seal member, and the range from the second substrate end of the panel body to the lower surface of the flexible substrate. It was formed in the extension part of the said 2nd board | substrate.
[0011]
Furthermore, the invention according to claim 2 is the one according to claim 1, wherein the resin layer is composed of any one of a photocurable resin, a thermosetting resin, and a thermoplastic resin.
[0012]
The invention according to claim 3 is characterized in that, in claim 1, the connection terminal is made of silver, copper, aluminum or an alloy thereof.
[0013]
Hereinafter, a plasma display device according to an embodiment of the present invention will be described with reference to FIGS.
[0014]
FIG. 1 shows an example of a panel structure in a plasma display device according to an embodiment of the present invention, FIG. 2 shows a cross section taken along the line AA in FIG. 1, and FIG. 3 shows a cross section along the line BB in FIG. A cut section is shown.
[0015]
As shown in the figure, a plurality of pairs of stripe-like display electrodes 4 that are paired with a scanning electrode 2 and a sustaining electrode 3 are formed on a transparent front substrate 1 such as a glass substrate. A light shielding layer 5 is disposed between adjacent display electrodes 4. The scan electrode 2 and the sustain electrode 3 are respectively composed of transparent electrodes 2a and 3a and buses 2b and 3b made of silver or the like electrically connected to the transparent electrodes 2a and 3a. A dielectric layer 6 is formed on the front substrate 1 so as to cover the plurality of pairs of electrodes, and a protective film 7 is formed on the dielectric layer 6.
[0016]
A plurality of stripes covered with an insulating layer 9 are arranged on the back substrate 8 facing the front substrate 1 in a direction perpendicular to the display electrodes 4 of the scan electrodes 2 and the sustain electrodes 3. A shaped address electrode 10 is formed. On the insulator layer 9 between the address electrodes 10, a plurality of stripe-shaped partition walls 11 are arranged in parallel with the address electrodes 10, and the phosphor layer 12 is formed on the side surface 11 a between the partition walls 11 and the surface of the insulator layer 9. Is provided.
[0017]
The substrate 1 and the substrate 8 are arranged to face each other with a minute discharge space so that the scan electrode 2 and the sustain electrode 3 and the address electrode 10 are orthogonal to each other, and the periphery is sealed, and the discharge One or a mixed gas of helium, neon, argon, and xenon is sealed in the space as a discharge gas. In addition, the discharge space is divided into a plurality of sections by partition walls 11 to provide a plurality of discharge cells 13 at which the intersections of the display electrodes 4 and the address electrodes 10 are located. In addition, the phosphor layers 12 are sequentially arranged one by one so as to be blue, thereby forming a panel body.
[0018]
FIG. 4 shows an electrode lead-out portion on the back side of the plasma display device. As shown in FIG. 4, a front substrate 1 having a display electrode (not shown) composed of scan electrodes and sustain electrodes, a dielectric layer 6 and a protective layer (not shown), and an insulator layer 9 The substrate 8 on the back side having the address electrodes 10, the barrier ribs 11, and the phosphor layer 12 is disposed opposite to the substrate 8 at a predetermined interval, and the peripheral portions of the substrates 1 and 8 are made of low melting point glass frit. It is sealed with a sealing member 14.
[0019]
Further, the substrate 8 of the panel body is provided with an extending portion 15 whose end portion extends to the outside of the sealing seal member 14, and the address electrode 10 is extended to the extending portion 15. And a plurality of connection terminals 16 made of silver, copper, aluminum, or an alloy thereof are disposed. The FPC 17 has wiring (not shown) connected to the connection terminal 16. The FPC 17 is bonded to the connection terminal 16 and the wiring conductor of the FPC 17 by thermocompression bonding via the ACF 18, and the extension It is attached to the part 15.
[0020]
Further, the extension portion 15 of the substrate 8 has a moisture-proof resin layer 19 made of any one of a photocurable resin, a thermosetting resin, and a thermoplastic resin, and a connection portion between the FPC 17 and the connection terminal. In order to cover the exposed portion of the sealing seal member 14, it is formed so as to be applied in a range from the end of the substrate 1 to the upper surface of the FPC 17 and a range from the end of the substrate 8 to the lower surface of the FPC 17.
[0021]
Further, the sealing member 14 is formed so as to protrude from the end portion of the substrate 1 to the extended portion 15 side of the substrate 8 . The length g of the protruding portion 14a that protrudes into the extending portion 15 of the sealing seal member 14 is desirably 1 mm or less from the end portion of the substrate 1 as shown in FIG. Here, by covering the moisture-proof resin layer 19 including the end portion of the substrate 1, it is possible to prevent moisture from entering from the interface. Then, by causing the sealing seal member 14 to protrude from the end portion of the substrate 1 to the extension portion 15, moisture is present between the portion sealed by the sealing seal member 14 and the moisture-proof resin layer 19. It is difficult to form an existing space, thereby suppressing the occurrence of address electrode migration at the connection portion and improving the reliability of the plasma display device.
[0022]
That is, if the sealing seal member 14 does not protrude from the extending portion 15 of the substrate 8, it is only necessary that the bonded portion of the end portions of the substrates 1 and 8 can be filled with the sealing seal member 14 without a gap. If there is a gap, when the moisture-proof resin layer 19 is applied to the entire electrode after FPC mounting, moisture in the air is confined between the resin layer 19 and the portion that cannot be filled with the sealing member 14. A space is formed, and it still includes a factor causing electrode migration, which may impair the long-term reliability of the connection terminal and the connection portion.
[0023]
In the present invention, the sealing seal member 14 is formed so as to protrude from the end portion of the substrate 1 toward the extending portion 15 side of the substrate 8, and between the resin layer 19 and the bonded portion of the substrate 1. Since it becomes difficult to form a moisture space that causes electrode migration, long-term reliability of the connection terminal and the connection portion can be maintained.
[0024]
Further, the length of the protruding portion 14a is set to be 1 mm or less from the end portion of the substrate. That is, when the sticking seal member 14 protrudes more, the metal thermal head used when the FPC 17 is thermocompression bonded to the connection terminal 16 provided in the extending portion 15 of the substrate 8 via the ACF 18 is If the sealing seal member 14 squeezed out and hardened is pressed from above, the substrate may be damaged or the thermal head may be damaged or damaged, and the FPC 17 may be connected. However, if the length of the protruding portion 14a is set to 1 mm or less from the end of the substrate 1 , problems such as breakage of the substrate when the FPC is mounted, chipping of the thermal head, and damage occur. It becomes difficult, and the fall of workability | operativity at the time of FPC attachment can be prevented.
[0025]
【The invention's effect】
As is clear from the above description, according to the plasma display device of the present invention, the portion sealed by the sealing member is made to protrude by a predetermined amount from the extending portion of the substrate. It is difficult to form a space in which moisture can exist between the resin layer and the resin layer, and the occurrence of migration of the address electrodes in the connection portion can be suppressed, thereby improving the reliability of the plasma display device.
[Brief description of the drawings]
1 is a perspective view in which a part of a panel structure of a plasma display device according to an embodiment of the present invention is cut away; FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a cross-sectional view taken along line B-B of FIG. 4 is a cross-sectional view showing the main part of the plasma display device.
DESCRIPTION OF SYMBOLS 1, 8 Substrate 2 Scan electrode 3 Sustain electrode 4 Display electrode 6 Dielectric layer 7 Protective film 9 Insulator layer 10 Address electrode 11 Partition 12 Phosphor layer 13 Discharge cell 14 Sealing seal member 14a Extruding part 15 Extending part 16 Connection terminal 17 Flexible substrate (FPC)
19 Resin layer

Claims (3)

A pair of first and second substrates are arranged to face each other so that a discharge space is formed therebetween, and a peripheral portion is sealed with a sealing seal member made of a low melting point glass frit, and discharge is generated in the discharge space. The panel body in which the electrodes are arranged on the substrate to form a plurality of discharge cells, and the end portion of the second substrate of the panel body is provided in the extending portion that extends to the outside of the sealing member. a plurality of connection terminals connected to the electrode, the flexible substrate attached to and the extending portion having a wiring connected to the connection terminal, wherein so as to cover the connection portion with the connection terminals of the flexible substrate A resin layer formed on the extending portion of the second substrate, and the sealing member is formed so as to protrude from the end portion of the first substrate to the extending portion side of the second substrate. And the protruding portion is the first 1 mm or less from the edge part of a board | substrate, and the said resin layer covers the connection part with the connecting terminal of the said flexible substrate, and also includes the exposed part of the said sealing seal member of the said panel main body, and the said 1st board | substrate. Forming in the extension part of the 2nd substrate so that it may be applied to the range from the edge part to the upper surface of a flexible substrate, and the range from the 2nd substrate edge part of the panel body to the lower surface of a flexible substrate A characteristic plasma display device.   The plasma display device according to claim 1, wherein the resin layer is made of any one of a photocurable resin, a thermosetting resin, and a thermoplastic resin.   The plasma display device according to claim 1, wherein the connection terminal is made of silver, copper, aluminum, or an alloy thereof.

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