JP2001166328A - Electrode connection structure of liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount chip parts on a flexible wiring board after having saved space. SOLUTION: This electrode connection structure of a liquid crystal display panel is such that chip parts 23 are mounted on a flexible wiring board 10 located on a transparent substrate 2B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode connection structure of a liquid crystal display panel for connecting an electrode terminal of a display electrode of the liquid crystal display panel to a flexible wiring substrate, and more particularly to a structure for connecting the electrode terminals of the liquid crystal display panel to the flexible wiring substrate. The present invention relates to a configuration related to mounting of chip components.

[0002]

2. Description of the Related Art First, a conventional electrode connection structure of a liquid crystal display panel of this type will be described with reference to FIGS.

In FIG. 5, a liquid crystal display panel 1 used to construct a liquid crystal display device has a pair of transparent substrates 2A and 2B each having a polarizing film (not shown) and arranged in parallel with each other. And these transparent substrates 2
A sealed space 4 is formed between A and 2B via a sealing material 3, and a liquid crystal 5 is sealed in the sealed space 4. A display electrode 6B made of an ITO film or the like is formed on the other transparent substrate 2B, which is larger than the transparent substrate 2A so as to protrude further from the side edge of the one transparent substrate 2A. The electrode terminal 7A connected to the display electrode 6B and the display electrode 6A formed of an ITO film or the like formed on one of the transparent substrates 2A are connected via a conductive material (not shown) mixed in the sealing material 3 or the like. The electrode terminals 7A that are electrically connected to each other are formed to extend on the transparent substrate 2B. The tip of the electrode terminal 7A is connected to an IC chip 8 mounted on the transparent substrate 2B. Further, another electrode terminal 7B extending to the side edge of the transparent substrate 2B is connected to the IC chip 8. In addition,
The electrical connection between the electrode terminals 7A and 7B and the IC chip 8 is made via an anisotropic conductive film 9.

On the other hand, the surface of the transparent substrate 2B is
A flexible wiring board 10 for energizing the C chip 8 is provided, and a wiring (not shown) of the flexible wiring board 10 is connected to the electrode terminal 7B via a conductive member 11. The conductive member 11 may be an anisotropic conductive film or a material in which conductive particles are mixed in an ultraviolet curable resin.

A chip component 12 such as a capacitor or a resistor is mounted on the flexible wiring board 10 by soldering.

As shown in FIG. 6, the conventional chip component 12 is spaced apart from the outer edge of the transparent substrate 2B on the front side of the flexible wiring board 10 when the transparent substrate 2A is disposed on the front side. In order to reduce the size of the liquid crystal display device, the flexible wiring board 10 on which the chip component 12 is mounted is housed so as to be bent along the outer edge of the transparent substrate 2B. .

[0007] Further, as shown in FIG.
Are disposed on the front surface side of the flexible wiring substrate 10 when the transparent substrate 2B is disposed on the front surface side, at a position separated from the outer edge of the transparent substrate 2B to the outside, and the chip component 12 is mounted thereon. The wiring substrate 10 may be housed so as to be bent to the rear side of the transparent substrate 2B.

[0008]

However, in order to dispose the chip components 12 in this manner, there are too many restrictive conditions. In particular, in the case of a small liquid crystal display panel 1 where the non-display area is small. However, it is becoming difficult to store the chip component 12 in a limited space.

Further, when the flexible wiring board 10 on which the chip component 12 is mounted is folded and stored along the outer edge of the transparent substrate 2B or on the rear side of the transparent substrate 2B, the chip component 12 is stored in the flexible wiring board. Since a force is applied to a soldering portion for bonding to the chip 10, the chip component 12 may fall.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is intended to mount a chip component on a flexible wiring board after achieving space saving, and to prevent the chip component from falling off the flexible wiring board. It is an object of the present invention to provide an electrode connection structure of the liquid crystal display panel 1 that can prevent the occurrence of the problem.

[0011]

In order to achieve the above object, a feature of the electrode connection structure of the liquid crystal display panel according to the present invention is that a chip component is provided on a flexible wiring substrate at a portion located on a transparent substrate. In that it is equipped with By adopting such a configuration, the chip components can be mounted in a small space, and the flexible wiring board on which the chip components are mounted cannot be bent. No force is applied to

A feature of the electrode connection structure of the liquid crystal display panel according to the present invention according to claim 2 is that a chip component is mounted on a transparent substrate on the same surface as the surface on which the electrode terminals are formed. Is that the flexible wiring board is bonded by an anisotropic conductive film connecting the electrode terminal and the flexible wiring board. And by adopting such a configuration,
Since the anisotropic conductive film for bonding the electrode terminals and the flexible wiring board is used for bonding the flexible wiring board and the transparent substrate at the portion where the chip component is mounted, another component such as a double-sided adhesive tape is not required. And bonding the flexible wiring board at the portion where the chip component is mounted to the transparent substrate, and bonding the flexible wiring board to the electrode terminal on the transparent substrate and the IC chip, respectively. This can be performed in the same step as the step of connecting the flexible wiring board.

Further, the feature of the electrode connection structure of the liquid crystal display panel according to the present invention is that the chip component is mounted on a transparent substrate on a side different from the side on which the electrode terminals are formed. The point is that the flexible wiring board of the portion is bonded. By adopting such a configuration, the electrode terminals are formed of a silicon resin for preventing electrolytic corrosion of the electrode terminals, protecting the IC chip and the flexible wiring board, and reinforcing the electrical connection. It is easy to dispose on the transparent substrate on the surface without the necessity of avoiding chip components.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIGS.

FIGS. 1 and 2 show a first embodiment of the present invention. In this embodiment, the configuration inside a transparent substrate is the same as that of the above-described conventional one, so that the illustration is omitted. . In the present embodiment, the transparent substrate 2A of the pair of transparent substrates 2A and 2B is disposed on the front side.

1 and 2, a base film 15 made of polyimide, polyester, or the like, a conductor 16 made of a conductive material, and a resin cover film 17 are shown.
The base film 15 of the flexible wiring board 10 having the three-layer structure is formed shorter than the conductor 16 and the cover film 17 on the distal end side of the flexible wiring board 10.
The conductor 16 connected to an external driving circuit (not shown) is exposed at the tip of the flexible wiring board 10. In addition, since the external drive circuit is connected to the exposed conductor portion 16 on the cover film 17 at the tip of the flexible wiring board 10, it is necessary to reinforce the tip of the flexible wiring board 10. Are provided.

On the other hand, a light-shielding tape 20 for preventing malfunction of the IC chip 8 is provided on the back surface of the transparent substrate 2B which is the back of the IC chip 8 mounted on the transparent substrate 2B constituting the liquid crystal display panel 1. Glued. Further, in order to reinforce the connection between the transparent substrate 2B and the flexible wiring substrate 10, a reinforcing tape 19 is provided on the back surface side of the transparent substrate 2B from near the center of the light shielding tape 20 to the flexible wiring substrate 10. It is bonded over the reinforcing plate 18 provided at the distal end.

Further, another electrode terminal (not shown) extending to the side edge of the transparent substrate 2B is connected to the IC chip 8, so that each of the electrode terminals is electrically connected to the IC chip 8. The connection is made via an anisotropic conductive film (not shown). Further, wiring of the flexible wiring board 10 (not shown)
The electrical connection between the electrode and the electrode terminal is also made via an anisotropic conductive film.

In the present embodiment, the electrical connection between the wiring (not shown) of the flexible wiring board and the electrode terminal is made via the anisotropic conductive film. However, the present invention is not limited to this.
An ultraviolet curable resin mixed with conductive particles may be used.

Further, in order to protect the IC chip 8 and the flexible wiring board 10 and to reinforce electrical connection, or to prevent electrolytic corrosion of display electrode terminals formed on the surface of the transparent substrate 2B. , A silicon resin 21.

In this embodiment, a substantially rectangular protrusion 22 is integrally formed on one surface of the flexible wiring board 10 at a position located on the transparent substrate 2B. Of the protruding portion 22 of the flexible wiring board 10
Are mounted with two capacitors 23 as an example of a chip component such as a capacitor and a resistor. The protruding portion 22 of the flexible wiring board 10 may be located on the electrode terminal on the transparent substrate 2B in some cases, but since the cover film 17 of the flexible wiring board 10 is insulative, the electrode terminal The flexible wiring board 10 is not adversely affected by being covered with the protrusion 22.

Further, the projecting portion 2 of the flexible wiring board 10
Reference numeral 2 denotes an anisotropic conductive film that electrically connects the electrode terminal and the flexible wiring board 10 at a portion that does not contact the electrode terminal.

In order to reduce the size of the liquid crystal display device, when mounting the liquid crystal display panel 1, the capacitor 2 is mounted.
The flexible wiring board 10 on which the circuit board 3 is mounted is bent and stored along the outer edge of the transparent board 2B.

According to such an embodiment of the present invention, since the capacitor 23 mounted on the flexible wiring board 10 is substantially located on the transparent substrate, chip components such as the capacitor 23 can be reduced in size. It can be mounted in a space, and even in a small-sized liquid crystal display panel 1 such as a mobile phone, it is possible to reduce the restrictions and maintain the degree of freedom of the surroundings and mount various functions.

Further, since the flexible wiring board 10 on which the capacitor 23 is mounted is not bent, no force is applied to the soldering portion to which the capacitor 23 is adhered. Wiring board 1
It can be prevented from falling from above, and safety can be improved.

The flexible wiring board 1 is made of an anisotropic conductive film.
Since the zero protruding portion 22 is bonded to the transparent substrate 2B, the capacitor 23 mounted on the protruding portion 22 can be stably held, and it is not necessary to use a double-sided adhesive tape or the like which is a separate component.

Further, a step of affixing the flexible wiring board 10 where the capacitor 23 is mounted to the transparent substrate 2B;
The bonding step and the bonding step can be performed in the same steps as the step of connecting the electrode terminals on the transparent substrate 2B and the IC chip 8 and the step of connecting the electrode terminals and the flexible wiring board 10, respectively. Therefore, the liquid crystal display panel 1 can be easily manufactured without increasing the number of manufacturing steps.

FIGS. 3 and 4 show a second embodiment according to the present invention. In this embodiment, the transparent substrate 2B of the pair of transparent substrates 2A and 2B is disposed on the front side. In addition, the tip of the flexible wiring board 10 has a protruding part 22 having a substantially rectangular shape, and a connecting part 24 for connecting the electrode terminal and the wiring of the flexible wiring board 10.
And it is forked.

As shown in FIG. 3, the protruding portion 22 of the flexible wiring board 10 is adhered to the front side of the transparent substrate 2B which is larger than the transparent substrate 2A. The two capacitors 23 are mounted on the protruding portion 22 of the flexible wiring board 10 at the position indicated by.

On the other hand, a display electrode terminal (not shown) is formed on the rear surface side of the transparent substrate 2B. As shown in FIG. 4, an IC chip 8 is connected to the tip of the electrode terminal. It is mounted in this way. Further, another electrode terminal (not shown) extending to the side edge of the transparent substrate 2B is connected to the IC chip 8, and a flexible wiring substrate for supplying electricity to the IC chip 8 is provided. 10 connecting parts 24
Are connected to the electrode terminal via a conductive member. Further, a silicon resin for preventing electrolytic corrosion of the electrode terminals, protecting the IC chip 8 and the flexible wiring board 10, and reinforcing electric connection is provided.

According to such an embodiment of the present invention, the protruding portion 22 of the flexible wiring board 10 where the capacitor 23 is mounted is adhered to the surface of the transparent substrate 2B to form an electrode terminal. Since the capacitor 23 is not mounted on the back side of the transparent substrate 2B, the capacitor 23 does not hinder the arrangement of the silicon resin for preventing the electrolytic corrosion of the electrode terminals on the transparent substrate 2B. .

Therefore, it is possible to easily dispose the silicon resin, and it is possible to simplify the manufacturing process of the liquid crystal display panel 1.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made as necessary.

[0034]

As described above, according to the electrode connection structure of the liquid crystal display panel of the present invention, chip components can be mounted in a small space.

That is, according to the electrode connection structure of the liquid crystal display panel according to the first aspect of the present invention, since the chip component is mounted on the flexible wiring substrate at a position located on the transparent substrate, the chip component can be reduced in size. It can be mounted in a space to reduce constraints and maintain the degree of freedom of the surroundings.

Further, since the flexible wiring board in the portion where the chip component is mounted is not bent, no force is applied to the soldering portion for bonding the chip component, and therefore the flexible wiring of the chip component is not applied. Fall from the substrate can be prevented, and safety can be achieved.

Further, according to the electrode connection structure of the liquid crystal display panel according to the second aspect of the present invention, the flexible wiring board and the transparent substrate at the portion where the chip component is mounted are connected to the electrode terminals and the flexible wiring board. The flexible wiring board where the chip components are mounted is bonded to the transparent substrate without the need for a separate component such as a double-sided adhesive tape, so that the chip components are stabilized. It can be kept in place.

Further, according to the electrode connection structure for a liquid crystal display panel according to the third aspect of the present invention, the flexible wiring board on which the chip component is mounted is different from the surface on which the electrode terminals are formed. Since it is adhered on the transparent substrate on the side, when disposing the silicon resin on the transparent substrate on the surface where the electrode terminals are formed to prevent electrolytic corrosion of the electrode terminals, the chip parts do not interfere This can be easily performed, and the manufacturing process can be simplified.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an electrode connection structure of a liquid crystal display panel according to the present invention.

FIG. 2 is an enlarged side view of the liquid crystal display panel shown in FIG.

FIG. 3 is a perspective view showing another embodiment of the electrode connection structure of the liquid crystal display panel according to the present invention.

4 is a perspective view of the liquid crystal display panel shown in FIG. 3 when viewed from the back.

FIG. 5 is a longitudinal sectional view showing an electrode connection structure of a conventional liquid crystal display panel.

FIG. 6 is a longitudinal sectional view when the flexible wiring board of the liquid crystal display panel shown in FIG. 5 is bent.

7 is a vertical cross-sectional view of a case where a large transparent substrate of a pair of transparent substrates of the liquid crystal display panel shown in FIG. 5 is disposed on the front side;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2A, 2B Transparent substrate 3 Sealing material 4 Sealed space 5 Liquid crystal 6A, 6B Display electrode 7A, 7B Electrode terminal 8 IC chip 9 Anisotropic conductive film 10 Flexible wiring board 11 Conductive member 12 Chip member 15 Base Film 16 Conductor 17 Cover film 18 Reinforcement plate 19 Reinforcement tape 20 Light shielding tape 21 Silicon resin 22 Projection 23 Capacitor 24 Connection

Continued on the front page F-term (reference) 2H092 GA48 GA49 GA50 GA60 HA25 NA25 NA27 PA05 5E336 AA09 AA11 BB12 CC32 CC51 DD02 DD32 EE08 GG16 GG26 5E344 BB04 BB07 BB12 CD04 CD40 EE12 EE16 5G435 AA14 AA21 BB12

Claims (3)

[Claims] 1. An electrode connection structure for a liquid crystal display panel, wherein an electrode terminal of a display electrode formed on at least one transparent substrate of the liquid crystal display panel is connected to a flexible wiring board on which a chip component is mounted. An electrode connection structure for a liquid crystal display panel, wherein the chip component is mounted on a portion of the flexible wiring substrate located on the transparent substrate. 2. The flexible wiring board at a position where the chip component is mounted on the transparent substrate on the same side as the surface on which the electrode terminals are formed, and the flexible wiring board is connected to the electrode terminals. The electrode connection structure for a liquid crystal display panel according to claim 1, wherein the electrode connection structure is bonded by an anisotropic conductive film. 3. The flexible wiring board in which the chip component is mounted on a transparent substrate on a side different from the side on which the electrode terminals are formed. The electrode connection structure of the liquid crystal display panel described in the above.