KR100670258B1 - Plasma display panel - Google Patents

Abstract

A panel having a plurality of electrodes for signal transmission at at least one end, a chassis base coupled to the panel to support the panel, a circuit board for applying a predetermined signal to the electrodes of the panel, and electrodes of the panel; At least one signal transmission means provided for electrical connection between the circuit board and having at least one terminal for providing an electrical connection in correspondence with the electrodes on the panel, respectively, the electrode on the panel and the signal transmission A plasma display device is disclosed in which the electrical connection of the terminals on the means is made using liquid anisotropic conductive ink (ACI).

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view showing a schematic view of a conventional plasma display device.

FIG. 2A is an exploded perspective view illustrating a state in which an electrode on a front substrate or a rear substrate and a signal transmitting means are coupled in the plasma display device of FIG. 1.

FIG. 2B is a cross-sectional view of the electrode and the signal transmission means combined on the front substrate and the rear substrate of FIG. 2A.

2C is a front view of FIG. 2B.

3A is a cross-sectional view of a state in which an electrode and a signal transmitting means are coupled on a front substrate or a back substrate according to an exemplary embodiment of the present invention.

3B is a front view of FIG. 3A.

<Description of Symbols for Major Parts of Drawings>

10: front substrate 20: back substrate

26: electrode on substrate 45: signal transmission means

46: circuit line on the signal transmission means 47: protective film

48: Anisotropic Conductive Film (ACF) 49: Anisotropic Conductive Ink (ACI)

The present invention relates to a plasma display device, and more particularly, to an electrode connection structure of a plasma display panel using liquid anisotropic conductive ink.

FIG. 1 is an exploded perspective view illustrating a structure of a conventional plasma display device, wherein a panel for implementing an image is formed by sealing a front substrate 10 and a back substrate 20, and the panel is formed by an adhesive tape 22. Is attached to the chassis base 30. In addition, a heat dissipation sheet 21 is interposed between the chassis base 30 and the rear substrate 20 to transfer heat generated from the panel to the chassis base to promote heat dissipation, or a predetermined area on the panels 10 and 20. It spreads heat generated in other areas of the panel to prevent local heat concentration. Various circuit boards 50 are mounted on the rear surface of the chassis base 30.

In the conventional plasma display device, the electrode of the panel is connected to a circuit board 50 such as a buffer board through a signal transmitting means 45 such as a tape carrier package (TCP).

At this time, an integrated circuit, that is, a circuit element 46 such as an IC (Integrated Circuit) or the like is mounted on the signal transmission means 45 such as TCP, so that dozens of circuit lines from the panel are provided to the circuit element 46. Integrated into the circuit board 50 such as a buffer board and the like. For example, a plasma display device in which two ICs are mounted on a single TCP terminal having a 72-pin panel electrode terminal connected to one end of the TCP and an 8-pin buffer board terminal connected to the other end of the TCP has been commercialized.

In this case, the circuit element 46 such as the IC is mounted on the chassis base 30 by thermal grease or the like on the chassis bed 40 which is generally bent in two steps in a Z shape. The cover plate 60 is mounted on the circuit element 46 such as an IC.

FIG. 2A shows a state in which the plurality of electrodes 26 on the front substrate 10 and the rear substrate 20 of the plasma display device are combined with the signal transmission means 45. As shown in the figure, the plurality of electrodes 26 on the back substrate 20 are arranged in the longitudinal direction and the plurality of electrodes 26 are converged for electrical coupling with the signal transmission means 45. On the other hand, although not shown in the figure, a plurality of electrodes are arranged in the transverse direction on the rear surface of the front substrate 10 is connected to the signal transmission means 45 at both ends of the front substrate 10.

FIG. 2B illustrates a cross-sectional view of the plurality of electrodes 26 on the front substrate 10 or the rear substrate 20 of FIG. 2A coupled to the signal transmission means 45. As can be seen in the drawing, an electrode 26 is disposed on the front substrate 10 or the rear substrate 20, and the signal transmission means 45 surrounds the circuit line 46 on both sides of the protective film 47. It is taking structure. Anisotropic Conduction Film (ACF) 48 is used for electrical connection between the electrode 26 on the substrates 10 and 20 and the circuit line 46 on the signal transmission means 45. Electrical connection by the use of is disclosed in U.S. Patent No.6086441.

However, in the case of using such an ACF, there is a limit in securing a stable electrical connection with respect to the spatial irregularity between the electrode 26 on the substrates 10 and 20 and the circuit lines 46 on the signal transmission means 45. That is, as shown in the original circle of FIG. 2C, the spatial spacing between the electrode 26 on the substrates 10 and 20 and the circuit lines 46 on the signal transmission means 45 corresponding thereto due to the cause of manufacturing defects or the like. If the irregularity is irregular and the ACF interposed therebetween is fixed in thickness, the electrical connection by the ACF 48 of the electrode 26 and the circuit line 46 in the original circle of FIG. 2C is not secured. Was present.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrical connection means which can more easily and stably secure electrical connection between an electrode on a substrate and a circuit line on a signal transmission means.

In order to achieve the above object, the plasma display device according to an embodiment of the present invention,

A panel having a plurality of electrodes for signal transmission at at least one end;

A chassis base coupled to the panel to support the panel;

A circuit board for applying a predetermined signal to an electrode of the panel; And

At least one signal transmission means provided for electrical connection between the electrode of the panel and the circuit board and having at least one terminal for providing an electrical connection corresponding to each of the electrodes on the panel;

The electrical connection between the electrode on the panel and the terminal on the signal transmission means is made using liquid anisotropic conductive ink (ACI).

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

FIG. 3A illustrates an electrode 26 on a substrate 10 and 20, a tape carrier package (TCP), and an FPC using an anisotropic conductive ink (ACI) as an electrode connection structure according to an exemplary embodiment of the present invention. It is sectional drawing which showed the electrical connection with the circuit line 46, such as copper, on the signal transmission means 45, such as (Flexible Printed Circuit). As can be seen in the figure, the electrode 26 is disposed on the front substrate 10 or the rear substrate 20, the signal transmission means 45 is a circuit line 46, the protective film 47 on the upper and lower sides It is surrounded by a structure. Anisotropic Conduction Ink (ACI) 49 is used to electrically connect the electrodes 26 on the substrates 10 and 20 and the circuit lines 46 on the signal transmission means 45.

Such liquid anisotropic conductive ink or resin is basically prepared by mixing conductive particles in a liquid solvent type resin. Viscosity, which is characteristic of liquid phase, has a range of about 10 ~ 100 Pa.s, and the characteristic length of the conductive particles (the length of particles that can identify particles of various shapes is assumed to be spherical particles. The indicated length) preferably has a size of 5-40 μm. The material of the conductive particles is metallic and has conductivity, and the electrical resistance due to ACI is preferably 100 ohm or less. However, the electrical insulation of the electrodeless portion is more than 10 ⁵ ohms, resulting in boiling resistance in terms of electrical resistance. That is, where the electrode 26 on the panels 10 and 20 and the circuit line 46 on the signal transmission means 45 are in contact with each other, the electrical resistance is low, and the electrical resistance is high at the non-contacting portion. In addition, since the solder (solder) does not enter at all, it is environmentally advantageous to inject the electrode electrically, and the liquid is injected, there is an advantage that it is possible to apply a precise shape or thickness. Normally, an inter-electrode pitch of about 100 μm is also possible.

As described above, when ACI is used as the electrode connection means, stable electrical connection is achieved even with respect to the spatial irregularity between the electrodes 26 on the substrates 10 and 20 and the circuit lines 46 on the signal transmission means 45. It can be secured. That is, as shown in FIG. 3B, due to the cause of manufacturing defects and the like, the spatial distance between the electrode 26 on the substrates 10 and 20 and the circuit line 46 on the corresponding signal transmission means 45 is constant. Otherwise, even if irregular, the ACI interposed therebetween is applied on the substrate (10, 20) or the signal transmission means 40 in a liquid state of which the thickness is not fixed, and the signal transmission with the substrate (10, 20) Since the means 40 are squeezed together and then solidified in the squeezed state with the passage of a certain time, the electrodes 26 on the substrates 10, 20 and the circuit lines 46 on the signal transmitting means 40. Even if the distance between the targets is slightly longer than the target, it is possible to secure the electricity sufficiently. That is, the conductive ink 49 is applied to the upper surfaces of the plurality of electrodes 26 or the plurality of circuit lines 46 of the signal transmission means, and the circuit lines 46 or the electrodes 26 corresponding thereto are crimped thereon. In this case, when the electrode 26 and the circuit line 46 are aligned and compressed together, the conductive particles 491 of the compressed portion are brought into contact with each other due to the compression and the electrode 26 and the circuit line 46 are pressed. Are energized with each other. However, in the portion where the electrode 26 and the circuit line 46 are not mutually compressed, the conductive ink 49 is solidified while the conductive particles 491 maintain a low density. 491 is not in contact with each other and is insulated.

In this case, as described above, if the conductive particles 491 are in contact with each other due to the compression between the electrode 26 and the circuit line 46, it is possible to secure the current, so that the electrode 26 and the circuit line 46 are secured. Even if the gap between the electrodes is somewhat uneven, the density of the conductive particles 491 interposed therebetween by the crimping of the electrode 26 and the circuit line 46 is high, and the electrode 26 and the electrode 26 can be contacted with each other. Electrical connection of the circuit line 46 is possible.

According to the plasma display device having the electrode connection structure according to the embodiment of the present invention having the above configuration, the following effects can be obtained.

Compared to the use of the ACF in the form of a film, when used in a liquid phase, there is an advantage that can easily cope with the space change between the various electrodes. That is, in the case of the film, the precision is affected by the gap between the panel electrode and the terminal of the signal transmission means and the change of the width of the electrode and the terminal according to the precision of positioning the film on the electrode, whereas in the case of liquid amorphous, this limitation is not affected. No stable electrical connection can be achieved.

In addition, even in the case where the space between the electrode and the terminal is uniform, the liquid phase, which is ink, exhibits superiority in terms of manufacturing convenience and manufacturing cost reduction.

Solder does not enter at all, it is environmentally advantageous to be electrically connected to the electrode to be injected into the liquid phase, there is an advantage that it is possible to apply a precise shape or thickness.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (4)

A panel having a plurality of electrodes for signal transmission at at least one end; A chassis base coupled to the panel to support the panel; A circuit board for applying a predetermined signal to an electrode of the panel; And At least one signal transmission means provided for electrical connection between the electrode of the panel and the circuit board and having at least one terminal for providing an electrical connection corresponding to each of the electrodes on the panel; And And the electrical connection between the electrode on the panel and the terminal on the signal transmission means is made using liquid anisotropic conductive ink (ACI). The method of claim 1, And the viscosity of the anisotropic conductive ink is about 10 to about 100 Pa.s. The method of claim 1, The anisotropic conductive ink includes a plurality of conductive particles, and the electrical connection of the electrode on the panel and the terminal on the signal transmission means is carried out by contacting the conductive particles by crimping the electrode on the panel and the terminal on the signal transmission means. Plasma display device characterized in that. The method of claim 3, wherein The anisotropic conductive ink includes conductive particles, and the general diameter or width of the conductive particles is 5 to 40 μm.

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