JP2003195778A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly connect electrode terminals with FPC terminals on a display device such as a plasma display device. <P>SOLUTION: The display device is provided with a panel 21 having a plurality of electrode terminals 18a formed side by side on a substrate 16, a flexible printed circuit board 38 having a plurality of FPC terminals 38d to be connected with the respective electrode terminals 18a of this panel 21, and an anisotropic conductive member 39 which is arranged between these flexible wiring board 38 and the panel 21 and connects the electrode terminals 18a with the FPC terminals 38d. The anisotropic conductive member 39 is provided with a 1st area 40 containing conductive particles in predetermined average density and a 2nd area 41 containing the conductive particles in average density less than the former, and the anisotropic conductive member 39 is arranged so that the 2nd area 41 of the anisotropic conductive member 39 is positioned at the tip side of the FPC terminals 38d. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device such as a plasma display device.

[0002]

2. Description of the Related Art In a plasma display device, which is known as a large-screen, thin, and light-weight display device, ultraviolet rays are generated by gas discharge, and the ultraviolet rays excite phosphors to emit light for color display. The display cell partitioned by the partition is provided on the substrate, and the phosphor layer is formed on the display cell.

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. However, high definition, large screen and Due to the ease of manufacturing, at present, the mainstream plasma display device is a surface discharge type of three-electrode structure, which has a display electrode forming a pair of a scan electrode and a sustain electrode on one substrate. However, since it has address electrodes arranged in a direction intersecting with the display electrodes, partition walls, and a phosphor layer on the other substrate, the phosphor layer can be made relatively thick, and color display by the phosphor is possible. Are suitable.

By the way, in the plasma display device,
The display electrodes and address electrodes formed on the substrate are connected to an electric circuit for driving and controlling display by using a flexible printed wiring board (hereinafter referred to as FPC), and the display electrodes or address electrodes and FPC are connected. Is bonded by thermocompression bonding through an anisotropically conductive member so as to establish electrical continuity.

FIG. 12 is a sectional view showing the joint between the FPC and the electrode terminal of the display electrode or address electrode.
FIG. 12A shows a state before thermocompression bonding, and FIG.
(B) shows the state after thermocompression bonding. 12
As shown in (a), the anisotropic conductive member 3 is formed on the electrode terminal 2 of the display electrode or the address electrode formed on the substrate 1.
The FPC 4 is arranged via the. The FPC 4 is configured by sandwiching the conductive wire 5 between a base film 6 that is an exterior member and a cover film 7. By removing a part of the cover film 7, the tip end of the conductive wire 5 is connected to the FPC terminal 8. As exposed. And this FP
C4 is arranged via the anisotropically conductive member 3 so that the FPC terminal 8 is located on the electrode terminal 2, and thermocompression bonding is performed in this state, so that the electrode terminal 2 is formed in the state shown in FIG. And the FPC terminal 8 are electrically connected by the anisotropic conductive member 3.

The anisotropic conductive member 3 is made of an insulating material in which conductive particles such as nickel (Ni) are dispersed, and usually has no conductivity, but the electrode terminal 2 and the FPC terminal 8 are not provided.
As shown in FIG. 13, the conductive particles 9 between the electrode terminal 2 and the FPC terminal 8 are bonded to each other by being crushed by being interposed between the electrode terminal 2 and the FPC terminal 8 by being crushed by being interposed between the electrode terminal 2 and the FPC terminal 8. Conduction can be obtained only at, and there is no conduction between the adjacent electrode terminals 2 and between the FPC terminals 8.

[0007]

However, when the electrode terminal 2 and the FPC terminal 8 are joined by using the conventional anisotropically conductive member, as shown in FIG. 14, the FPC terminal 8 may be joined depending on the accuracy in the manufacturing process. May be obliquely attached to the electrode terminal 2, and in such a case, in the narrowed region 10 between the end of the FPC terminal 8 and the electrode terminal adjacent to the electrode terminal 2 which is supposed to be conductive. The conductive particles 9 dispersed in the anisotropic conductive member 3 are likely to accumulate, and F
There is a case where the PC terminal 8 and the adjacent electrode terminal 2 are electrically connected.

The present invention has been made to solve such a problem, and an object of the present invention is to make it possible to properly bond an electrode terminal and an FPC terminal.

[0009]

In order to achieve this object, a display device of the present invention includes a display panel having a plurality of electrode terminals formed in parallel on a substrate, and an electrode terminal of the display panel. A flexible printed wiring board having a plurality of FPC terminals connected to each other; and an anisotropic conductive member arranged between the flexible printed wiring board and the display panel for connecting the electrode terminals to the FPC terminals. The anisotropically conductive member is provided with a first region containing conductive particles at a predetermined average density and a second region containing conductive particles at a lower average density, and the FPC The anisotropic conductive member is arranged such that the second region of the anisotropic conductive member is located on the tip end side of the terminal. With this configuration, it is possible to prevent electrical conduction between the FPC terminal and the electrode terminal adjacent to the electrode terminal that is supposed to be electrically conductive.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 11 using a plasma display device as an example.

FIG. 1 is a perspective view showing a main part of a plasma display panel which is a display panel. As shown in FIG. 1, on a transparent front side substrate 11 such as a glass substrate,
A plurality of columns of stripe-shaped display electrodes forming pairs of scan electrodes 12 and sustain electrodes 13 are formed, and a dielectric layer 14 is formed so as to cover the electrode group, and a protective film 15 is formed on the dielectric layer 14. Are formed.

The overcoat layer 1 is formed on the rear substrate 16 facing the front substrate 11 so as to intersect the scan electrodes 12 and the sustain electrodes 13.
A plurality of rows of striped address electrodes 18 covered with 7
Are formed. A plurality of partition walls 19 are arranged in parallel with the address electrodes 18 on the overcoat layer 17 between the address electrodes 18, and a phosphor layer 20 is provided on the side surfaces of the partition walls 19 and the surface of the overcoat layer 17. .

The substrate 11 and the substrate 16 are composed of the scan electrode 12, the sustain electrode 13 and the address electrode 1.
8 are arranged so as to be substantially orthogonal to each other with a minute discharge space sandwiched therebetween and the periphery is sealed, and one kind of helium, neon, argon and xenon or a mixed gas is discharged into the discharge space. It is enclosed as a gas. Further, the discharge space is partitioned into a plurality of sections by partition walls 19, so that discharge cells are provided at the intersections of the scan electrodes 12 and the sustain electrodes 13 and the address electrodes 18, and each of the discharge cells has red, green and The phosphor layers 20 are sequentially arranged one by one so as to become blue.

FIG. 2 shows an example of the overall structure of a plasma display device incorporating the panel having the structure described above. In FIG. 2, a housing for housing the panel 21 is composed of a front frame 22 and a metal back cover 23, and an opening portion of the front frame 22 is made of glass or the like which also serves as an optical filter and protects the panel 21. Front cover 2
4 are arranged. Further, for example, silver vapor deposition is applied to the front cover 24 in order to suppress unnecessary radiation of electromagnetic waves. Further, the back cover 23 has a panel 21
Ventilation holes 2 for releasing the heat generated by
3a is provided.

The panel 21 is held by being adhered to the front surface of a chassis member 25 made of aluminum or the like via a heat conductive sheet 26, and a plurality of panels 21 for driving the display of the panel 21 are provided on the rear surface side of the chassis member 25. The circuit block 27 of is attached. Heat conduction sheet 2
Reference numeral 6 is for efficiently transmitting the heat generated in the panel 21 to the chassis member 25 and radiating the heat. Further, the circuit block 27 includes an electric circuit for driving and controlling the display of the panel 21, and the electrode lead-out portion led out to the edge portion of the panel 21 extends beyond the four edge portions of the chassis member 25. It is electrically connected by a plurality of extending FPCs (not shown).

Further, on the rear surface of the chassis member 25, a boss portion 25a for attaching the circuit block 27 and fixing the back cover 23 is provided by projecting integrally by die casting or the like. In addition, this chassis member 25
May be constructed by fixing a fixing pin to an aluminum flat plate.

FIG. 3 is a plan view showing an internal arrangement structure of the plasma display device having such a structure with the back cover 23 removed, and in FIG. 3, the scan driver circuit block 28 has predetermined scan electrodes of the panel 21. The scan driver supplies a signal voltage, the sustain driver circuit block 29 supplies a predetermined signal voltage to the sustain electrodes of the panel 21, and the address driver circuit block 30 supplies a predetermined signal voltage to the address electrodes of the panel 21. The circuit block 28 and the sustain driver circuit block 29 are arranged at both ends of the chassis member 25 in the width direction, and the address driver circuit block 30 is arranged at the upper end and the lower end of the chassis member 25 in the height direction.

The control circuit block 31 receives an image based on a video signal sent from an input signal circuit block 32 having an input terminal portion to which a connection cable for connecting to an external device such as a television tuner is detachably connected. The data is converted into an image data signal corresponding to the number of pixels of the panel 21 and supplied to the address driver circuit block 30, and a discharge control timing signal is generated and supplied to the scan driver circuit block 28 and the sustain driver circuit block 29, respectively. The display drive control such as the gradation control is performed, and the display drive control is arranged in the substantially central portion of the chassis member 25.

The power supply block 33 supplies a voltage to each of the above-mentioned circuit blocks, and like the control circuit block 31, it is arranged at substantially the center of the chassis member 25 and is equipped with a power supply cable (not shown). A commercial power supply voltage is supplied through a power supply input block 35 having a connector 34.

The bracket 36 is mounted on the stand pole, and is mounted at the lower end of the chassis member 25 in the height direction. The tip of the stand pole attached to the stationary stand is inserted into the hole of the bracket 36, and the stand pole is fixed to the bracket 36 with screws or the like to attach the stand, whereby the panel is held upright. It will be.

The FPC 37 includes a scan electrode of the panel 21, an electrode lead-out portion of a sustain electrode, a scan driver circuit block 28, and a sustain driver circuit block 29.
The FPC38 is connected to the printed wiring board of
The electrode lead-out portion of the address electrode and the printed wiring board of the address driver circuit block 30 are connected to each other, and are arranged by being bent 180 degrees from the front side to the back side through the outer peripheral portion of the panel 21.

At the electrode lead-out portions of the scan electrode and the sustain electrode of the panel 21, the electrode terminals of the scan electrode and the sustain electrode and the FPC terminal of the FPC 37 are connected via an anisotropic conductive member. Similarly, in the electrode lead-out portion of the address electrode of the panel 21, the electrode terminal of the address electrode and the FPC terminal of the FPC 38 are connected via the anisotropic conductive member.

Next, the electrode terminal of the address electrode and the FPC 3
FIG. 4 shows the connection structure of the FPC terminal No. 8 and the FPC terminal. In addition, the electrode terminals of the scan electrode and the sustain electrode and F
The connection structure with the FPC terminal of the PC 37 has the same configuration.

4 (a) and 4 (b) are a plan view and a sectional view of the electrode lead-out portion of the address electrode. As shown in FIG. 4, a plurality of electrode terminals 18a are formed in parallel at the edge portion on the rear surface side substrate 16 which constitutes the plasma display panel. The electrode terminal 18a is formed by drawing the address electrode 18 to the edge of the substrate 16. The FPC 38 is configured by sandwiching a plurality of conductive wires 38a between a base film 38b, which is an exterior member, and a cover film 38c. By removing a part of the cover film 38c, the tip end of the conductive wire 38a is exposed as an FPC terminal 38d. The plurality of FPC terminals 38d are connected to the electrode terminals 18a, respectively.

Plasma display panel and FPC 38
An anisotropic conductive member 39 is provided between the electrode terminal 18a and the FPC terminal 3 by the anisotropic conductive member 39.
8d is connected. The anisotropic conductive member 39 is formed by dispersing conductive particles such as Ni in an insulating material, and the anisotropic conductive member 39 contains conductive particles at a predetermined density. The first region 40 and the second region 41 containing the conductive particles at a density lower than that are provided,
The anisotropic conductive member 39 is arranged so that the second region 41 is located on the tip side of the FPC terminal 38d.

Then, the anisotropic conductive member 39 and the electrode terminal 1
8a so as to cover the base film 38b of the FPC 38
Airtightness and adhesiveness are secured by forming the resin coating portions 42 on the side and the cover film 38c side, respectively.

In the plasma display device of this embodiment as described above, even if the FPC terminal 38d is obliquely attached to the electrode terminal 18a, the density of the conductive particles in the second region 41 is low, and therefore the predetermined value is obtained. FPC terminal 38
The electrode terminal 18 adjacent to the electrode terminal 18a that should be electrically connected to d
The FPC 38 is not attached in a state in which the conductive particles are accumulated between the FPC terminal 38a and the a, and the FPC terminal 38d and the electrode terminal 18a are not electrically connected.

The first region 40 of the anisotropically conductive member 39.
Also, the density of the conductive particles in the second region 41 does not have to be constant, and the density of the conductive particles in the first region 40 to the second region 41 may be appropriately reduced.
That is, the average density of the conductive particles in the second region 41 may be made smaller than the average density of the conductive particles in the first region 40.

The first region 40 of the anisotropically conductive member 39 is also provided.
The density of the conductive particles may be set to the same level as in the case of the conventional anisotropic conductive member.
And the FPC terminal 38d can be surely conducted. Further, the density of the conductive particles in the second region 41 is
A predetermined FPC terminal 38 is formed by collecting conductive particles.
It may be set to such an extent that there is no electrical connection between the electrode terminal 18a adjacent to the electrode terminal 18a that should normally conduct electrical current.

Next, the electrode terminal 18a and the FPC terminal 38d
A method of connecting and through the anisotropically conductive member 39 will be described with reference to FIGS.

First, as shown in FIG. 5, the rear substrate 16 is provided.
In the electrode lead-out portion of the address electrode 18 formed above, a tape-shaped anisotropic conductive member 39 having a width of about 3 mm and a thickness of about 30 to 40 μm is arranged on the electrode terminal 18a of the address electrode 18. . Anisotropically conductive member 3
9 is composed of the first region 40 and the second region 41 in the width direction, and the average density of the conductive particles in the second region 41 is set lower than that of the first region 40. The anisotropic conductive member 39 is arranged so that the first region 40 covers the tip of the electrode terminal 18a and is located on the end side of the substrate 16.

Next, as shown in FIG. 6, the electrode terminal 18a and the corresponding FPC terminal 38d overlap each other, and the tip of the FPC terminal 38d overlaps the second region 41 of the anisotropic conductive member 39.
The FPC 38 is arranged on the anisotropic conductive member 39 so as to be located in the vicinity of.

After that, the anisotropically conductive member 3 is melted by a usual thermocompression bonding means to melt the anisotropically conductive member 3.
9 spreads to the connecting portion, and as shown in FIG.
The a and the FPC terminal 38d are electrically connected by the conductive particles in the anisotropic conductive member 39 being bonded. At this time, the tip end portion of the FPC terminal 38d has an anisotropic conductive member 3
9 is located on the second region 41, and the tip of the FPC terminal 38d is always on the second region 41 while the anisotropic conductive member 39 spreads during thermocompression bonding. Therefore, F
Even if the PC terminal 38d is obliquely attached to the electrode terminal 18a, since the density of the conductive particles in the second region 41 is low, the electrode adjacent to the electrode terminal 18a that is supposed to be electrically connected to the predetermined FPC terminal 38d. The conductive particles do not accumulate and conduct with the terminals.

Next, a coating portion 42 made of resin is formed so as to cover the exposed portions of the electrode terminals 18a and the anisotropically conductive member 39, respectively, whereby the plasma display device shown in FIG. 4 is obtained. .

By the way, as shown in FIG.
Is a conductive film 38a and a base film 38b which is an exterior member.
And a cover film 38c, and a part of the conductive wire 38a is exposed from the cover film 38c.
The PC terminal 38d is provided, and the FPC terminal 38d
At the boundary between the cover film 38c and the cover film 3c.
A step is formed due to the thickness of 8c, and the step causes the conductive particles in the anisotropic conductive member 39 to accumulate and to be adjacent to each other.
There may be electrical continuity between the PC terminals 38d.

FIG. 8 shows another embodiment of the present invention for solving this problem. This embodiment differs from the plasma display device of the present invention shown in FIG. 4 in the configuration of the anisotropic conductive member. As shown in FIG.
The anisotropic conductive member 43 connecting the electrode terminal 18a and the FPC terminal 38d contains the first region 44 containing conductive particles at a predetermined density and the conductive particles at a density lower than that. A second region 45 and a third region 46 located on both sides of the first region 44 are provided. Second area 45 is FP
The third region 46 is located on the tip side of the C terminal 38d, and the third region 46 is the step portion 4 at the boundary between the cover film 38c and the FPC terminal 38d.
An anisotropic conductive member 43 is arranged so as to be located at 7.

According to this structure, in addition to the effects of the above-described embodiment, the anisotropic conductive member 4 is formed by thermocompression bonding.
Although the movement of the conductive particles is hindered by the step portion 47 when 3 spreads, since the density of the conductive particles in the third region 46 is low, the conductive particles are accumulated in the step portion 47 in the FP.
C38 is not attached, and there is no conduction between adjacent FPC terminals 38d.

Incidentally, the first region 4 of the anisotropically conductive member 43.
4, the density of the conductive particles in the second region 45 and the third region 46 does not have to be constant, and for example, the density of the conductive particles is appropriately reduced from the first region 44 to the second region 45 and the third region 46. It may be made to be. That is, the average density of the conductive particles in the second region 45 and the third region 46 may be made smaller than the average density of the conductive particles in the first region 44.

Further, the first region 44 of the anisotropically conductive member 43.
The density of the conductive particles may be set to the same level as in the case of the conventional anisotropic conductive member.
And the FPC terminal 38d can be surely conducted. Further, the density of the conductive particles in the second region 45 is
A predetermined FPC terminal 38 is formed by collecting conductive particles.
It may be set to such an extent that there is no electrical connection between the electrode terminal 18a adjacent to the electrode terminal 18a that should normally conduct electrical current. Also,
The density of the conductive particles in the third region 46 is such that the conductive particles are accumulated in the step portion 47 so that the adjacent FPC terminals 38.
It may be set so that there is no electrical connection between d.

Next, in the present embodiment, the electrode terminal 1
A method of connecting 8a and the FPC terminal 38d through the anisotropically conductive member 43 will be described with reference to FIGS. 9 to 11.

First, as shown in FIG. 9, the rear substrate 16
At the electrode lead-out portion of the address electrode 18 formed above, the anisotropic conductive member 43 is arranged on the electrode terminal 18a of the address electrode 18. The anisotropic conductive member 43 has a configuration in which a second region 45, a first region 44, and a third region 46 are sequentially arranged in the width direction of the anisotropic conductive member 43.
The density of the conductive particles in the region 46 is set lower than that in the first region 44. Then, the anisotropic conductive member 43 is arranged so that the third region 46 is located on the end side of the substrate 16.

Next, as shown in FIG. 10, the electrode terminal 18a
So that the corresponding FPC terminal 38d overlaps with the FPC3.
Place 8 At this time, the FPC 38 is anisotropically conductive so that the tip of the FPC terminal 38d is located near the second region 45 of the anisotropic conductive member 43 and the step portion 47 of the FPC 38 is located near the third region 46. It is arranged on the flexible member 43.

After that, the anisotropic conductive member 43 is melted by the usual thermocompression bonding means to melt the anisotropic conductive member 4.
3 spreads, and as shown in FIG. 11, the electrode terminal 18a and the FP
The C terminal 38d is electrically connected by the anisotropic conductive member 43. At this time, the tip of the FPC terminal 38d is located on the second region 45 of the anisotropically conductive member 43, and the step portion 47 is located on the third region 46. In this case, FP
Even if the C terminal 38d is obliquely attached to the electrode terminal 18a, since the density of the conductive particles in the second region 45 is low, the electrode adjacent to the electrode terminal 18a which is supposed to be electrically connected to the predetermined FPC terminal 38a. The conductive particles do not accumulate and conduct with the terminals. In addition, when the anisotropically conductive member 43 spreads by thermocompression bonding, the conductive particles move due to the step portion 4.
However, since the density of the conductive particles in the third region 46 is low, the conductive particles do not accumulate in the step portion 47 and the adjacent FPC terminals 38d are not electrically connected.

Subsequently, a resin coating portion 42 is formed so as to cover the exposed portions of the electrode terminals 18a and the anisotropically conductive member 43, thereby forming a plasma display device having a connection structure as shown in FIG. Is obtained.

Although the plasma display device has been described in the above-mentioned embodiments, it can be applied to a display device such as a liquid crystal display device in which an electrode terminal of a panel and an FPC terminal are joined using an anisotropic conductive member. The present invention can be applied.

[0046]

As is apparent from the above description, according to the method of manufacturing a display device of the present invention, the electrode terminals of the panel and the FPC terminals can be properly joined, and the connection failure due to the FPC can be eliminated. You can

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a panel of a plasma display device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an internal arrangement structure of the plasma display device.

FIG. 3 is a plan view showing an internal arrangement structure of the plasma display device.

4 (a) and 4 (b) are a plan view and a cross-sectional view showing a main structure of the plasma display device.

5 (a) and 5 (b) are a plan view and a cross-sectional view showing a state of a main part at the time of manufacturing the plasma display device.

FIG. 6 is a sectional view of the same.

FIG. 7 is a sectional view of the same

FIG. 8 is a sectional view showing a main structure of a plasma display device according to another embodiment of the present invention.

9 (a) and 9 (b) are a plan view and a cross-sectional view showing a state of a main part at the time of manufacturing the plasma display device.

FIG. 10 is a sectional view of the same

FIG. 11 is a sectional view of the same

12 (a) and 12 (b) are cross-sectional views showing a situation in which an electrode terminal of a conventional panel and a terminal of a flexible printed wiring board are joined together.

FIG. 13 is a cross-sectional view showing a state in which an electrode terminal of a panel and a terminal of a flexible printed wiring board are joined by an anisotropic conductive film by thermocompression bonding.

FIG. 14 is a plan view showing a state in which the terminals of the flexible printed wiring board are obliquely attached to the electrode terminals of the panel.

[Explanation of symbols]

16 substrates 18a electrode terminal 21 panels 38 Flexible Printed Circuit Board (FPC) 38a Conductive wire 38b base film 38c cover film 38d FPC terminal 39, 43 Anisotropically conductive member 40,44 First area 41, 45 Second area 42 Cover 46 Third Area 47 Step

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2H092 GA48 GA50 GA55 MA32 NA16                       NA29                 5E344 AA01 AA02 BB02 BB04 CC23                       CD04 DD06 EE16 EE23                 5G435 AA17 BB06 EE32 EE40 EE42                       KK02 KK05

Claims (2)

[Claims] 1. A display panel having a plurality of electrode terminals formed side by side on a substrate, and a flexible printed wiring board having a plurality of FPC terminals respectively connected to the electrode terminals of the display panel, An anisotropic conductive member for connecting the electrode terminal and the FPC terminal is provided between the flexible printed wiring board and the display panel, and the anisotropic conductive member has conductive particles with a predetermined average density. Is provided, and a second region containing conductive particles at an average density smaller than that is provided, and the second region of the anisotropic conductive member is located on the tip end side of the FPC terminal. Display device in which an anisotropic conductive member is disposed. 2. A display panel having a plurality of electrode terminals formed side by side on a substrate, and a plurality of FPC terminals respectively connected to the electrode terminals of the display panel and having a conductive wire as an exterior member. And a flexible printed wiring board sandwiched between the flexible printed wiring board and the display panel, and an anisotropic conductive member for connecting the electrode terminal and the FPC terminal. A first region in which the conductive member contains conductive particles at a predetermined average density, and a second region and a third region containing conductive particles at a lower average density and located on both sides of the first region. And a second region of the anisotropic conductive member is located on the tip end side of the FPC terminal, and a second region of the anisotropic conductive member is provided at a boundary portion between the exterior member of the flexible printed wiring board and the FPC terminal. A display device in which an anisotropic conductive member is arranged so that three regions are located.