JP2713221B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device in which a liquid crystal display element and a driving circuit for driving the liquid crystal display element are connected by a heat seal connector, and in particular, the liquid crystal display element and the heat seal connector are electrically stable. The present invention relates to a liquid crystal display device that can be connected in a state.

[0002]

2. Description of the Related Art A conventional liquid crystal display device will be described below with reference to FIGS. FIG. 6 is a plan view showing a conventional liquid crystal display device, and FIG. 7 is a plan view showing a heat seal connector of the conventional liquid crystal display device. 8 is a sectional view taken along the line CC of FIG. 6, and FIG. 9 is a sectional view taken along the line DD of FIG.
FIG. 10 is a sectional view taken along the line EE of FIG.

As shown in FIG. 6, a conventional liquid crystal display 1
00 denotes the liquid crystal display element 110 and the liquid crystal display element 11
The printed circuit board 20 on which the drive circuit of No. 0 is mounted, and the heat seal connector 30 for electrically connecting the liquid crystal display element 110 and the printed circuit board 20 are provided.

[0004] The connecting portion 111 of the liquid crystal display element 110 includes:
As shown in FIGS. 6 and 8, a plurality of electrodes (transparent electrodes) 111 a are formed at predetermined intervals, and the connection portion 21 of the printed circuit board 20 has a structure as shown in FIGS. 6 and 9. A plurality of electrodes 21a were formed at predetermined intervals.

The heat seal connector 30 is shown in FIG.
As shown in FIG. 10, a plurality of strip-shaped conductive adhesives 32 and an insulating adhesive 33 are formed on a polyester tape 31.
Are applied separately by a printing method, and a protective film 34 is adhered to the central portion of the polyester tape 31 so that the connecting portions 30a, 3 are attached to both ends of the polyester tape 31.
0b was formed.

The connection between the liquid crystal display element 110 and the printed circuit board 20 by such a heat seal connector 30 is as follows.
It was done as follows. First, the connecting portions 30a and 30b of the heat seal connector 30 are connected to the respective connecting portions 11 of the liquid crystal display element 110 and the printed circuit board 20 so that the conductive adhesive 32 and the electrodes 111a and 21a correspond to each other.
Superimpose on 1,21. In this state, the connection portions 30a,
When the 111 and the connecting portions 30b and 21 are thermocompression-bonded respectively, the electrodes 111a and 21a are electrically connected by the conductive adhesive 32, and the connecting portions 30a, 111 and the connecting portions 30b and 21 are electrically connected by the insulating adhesive 33. Glued.

[0007]

Here, in the above-mentioned conventional liquid crystal display device, the electrode 111 of the liquid crystal display element 110 is used.
The thickness of the electrode 21a of the printed circuit board 20 is about 15 μm to 40 μm while the thickness of a is about 0.01 μm to 0.1 μm.
m, and the thicknesses of these electrodes 111a and 21a were greatly different (see FIGS. 8 and 9).

As described above, when the thicknesses of the electrodes 111a and 21a are greatly different, the amount of the insulating adhesive 33 necessary for connecting the liquid crystal display element 110 and the insulating adhesive 33 necessary for connecting the printed circuit board 20 are different. There is also a difference in the amount of

That is, the connecting portion 21 of the printed circuit board 20
In this case, since the thickness of the electrode 21a is large, a large amount of the insulating adhesive 33 is used to compensate for a large step between the electrode 21a and the base surface.
Is required, while the connecting portion 1 of the liquid crystal display element 110 is required.
11, the thickness of the electrode 111a is small,
The step between a and the base surface is small, and only a small amount of the insulating adhesive 33 is required.

However, since the insulating adhesive 33 (and the conductive adhesive 32) is formed on the polyester tape 31 by a printing method, the adhesive film is formed between the liquid crystal display element 110 and the printed circuit board 20. It was difficult to change the thickness.

For this reason, in the conventional liquid crystal display device, the thickness of the insulating adhesive 33 is set to a thickness corresponding to the electrode 21a of the printed circuit board 20 (see FIG. 10), and the thin electrode 111a is formed. Connection part 111 of liquid crystal display element 110
In the above, the extra insulating adhesive 33 becomes conductive adhesive 32
There is a problem that the electric connection protrudes to the side and the electrical connection becomes unstable.

In Japanese Patent Application Laid-Open No. 3-95520, a connection portion of a printed board on which a thick electrode is formed and a connection portion of a heat seal connector are firmly bonded to each other. A liquid crystal display device having a configuration in which an adhesive is applied has been proposed.

By applying this technique, that is, an appropriate amount of the insulating adhesive 33 is applied between the electrodes 21a of the printed circuit board 20 in advance, and the film thickness of the insulating adhesive 33 of the heat seal connector 30 is adjusted. If the thickness is determined according to the thickness of 111a, the connecting portion 111 of the liquid crystal display element 110
It is theoretically possible to supply an appropriate amount of the insulating adhesive 33 to both the connection portions 21 of the printed circuit board 20.

However, in practice, the process of applying the insulating adhesive 33 between the electrodes 21a of the printed circuit board 20 in advance increases, and the insulating adhesive 33 does not protrude to the electrode 21a side. It is very difficult to apply 33 between the electrodes 21a, and the application of the above technology was impossible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a simple structure capable of appropriately adjusting an amount of an insulating adhesive supplied to a connection portion of a liquid crystal display element. It is an object of the present invention to provide a liquid crystal display device capable of connecting a display element and a heat seal connector in an electrically stable state.

In order to achieve the above object, a liquid crystal display device of the present invention has a plurality of electrodes formed at predetermined intervals, and a driving circuit for outputting a signal through these electrodes;
A plurality of electrodes formed at predetermined intervals on a substrate;
Holes formed between the plurality of electrodes of the substrate
And a plurality of strip-shaped conductive adhesives respectively connecting the electrodes of the drive circuit and the electrodes of the liquid crystal display element, and a plurality of strip-shaped adhesives applied between the conductive adhesives. A heat seal connector having an insulating adhesive; and
The holes between the electrodes are arranged in a plurality of small
It can be made up of either
Preferably, a hole is formed between the electrodes of the liquid crystal display element.
The hole has a large diameter near the inlet .

[0017]

According to the liquid crystal display device of the present invention having the above-described structure, the extra insulating adhesive supplied to the connection portion of the liquid crystal display element is used in the thermocompression bonding step of the heat seal connector.
The liquid flows into the holes formed between the electrodes of the connection portion, and is adjusted to an appropriate amount necessary for bonding. In addition, in the case of a configuration in which a long hole is formed between the electrodes, or a configuration in which a plurality of holes are formed, an excess insulating adhesive flows into the hole smoothly, thereby providing more effective insulation. The amount of the conductive adhesive can be adjusted.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the liquid crystal display device of the present invention will be described below with reference to the drawings. FIG. 1 shows a liquid crystal display element forming the liquid crystal display device of the present embodiment.
2A is a plan view, and FIG. 2B is a cross-sectional view taken along line AA of FIG.

In FIGS. 1A and 1B, reference numeral 10 denotes a liquid crystal display element forming the liquid crystal display device of the present embodiment, and a connection portion 11 is provided with a plurality of electrodes (transparent electrodes) at predetermined intervals. ) 11a are formed. Generally, liquid crystal display elements are
Materials such as transparent electrodes, polarizing plates, and reflectors on glass substrates
Is arranged and configured.
As shown in FIG. 1, a liquid crystal display element 10 made of a glass substrate
Transparent electrodes 11a are formed in a comb shape at a predetermined interval on the surface of
And constitutes a liquid crystal display element (note that FIG.
And other parts that make up the liquid crystal display element, such as polarizing plates and reflectors
The materials are not shown in the drawings). Then, configure this board
The liquid crystal display element 10 has a comb shape as shown in FIG.
Three holes 11 are provided between each of the formed electrodes 11a.
b, 11b, 11b are bored in a state of being lined up vertically.

A driving circuit for driving such a liquid crystal display element 10 is mounted on a printed circuit board 20 similar to the conventional one, as shown in FIGS. The heat seal connector for connecting the heat seal connector 20 has the same configuration as the conventional heat seal connector 30 as shown in FIGS. Accordingly, the film thickness of the insulating adhesive 33 of the heat seal connector 30 is also changed as shown in FIG.
1a.

According to the liquid crystal display device of the present embodiment having such a configuration, the excess insulating adhesive 33 supplied to the connection portion 11 of the liquid crystal display element 10 is used in the thermocompression bonding process of the heat seal connector 30. Flows into the holes 11b formed between the electrodes 11a, and is adjusted to an appropriate amount necessary for bonding. Thereby, the liquid crystal display element 10 and the heat seal connector 30 can be connected in an electrically stable state.

In the present liquid crystal display device, each electrode 11a
Since the three holes 11b, 11b, 11b are formed between the three holes, the extra insulating adhesive 33 smoothly flows into the three holes 11b, 11b, 11b, and the insulating property is more effectively increased. The amount of the adhesive 33 can be adjusted.

Next, another embodiment of the liquid crystal display device of the present invention will be described. In the above embodiment, three holes 11b, 11b, 11b are provided between the electrodes 11a of the liquid crystal display element 10.
Although the configuration is such that b is perforated, as shown in FIG. 2, a configuration in which a long hole 11c is formed between the electrodes 11a may be employed.

As shown in FIG. 3, a hole 11d having a large diameter near the inlet may be used. With such a configuration, the surplus insulating adhesive 33 easily enters the hole 11d. Further, as shown in FIG. 4 or FIG.
All or a part of the plurality of holes may be the bottomed hole 11e.

The liquid crystal display of the present invention is not limited to the above embodiment. For example, in the above embodiment, the case where the drive circuit of the liquid crystal display element 10 is mounted on the printed circuit board 20 has been described. However, the present invention is not limited to this, and the drive circuit may be a TAB (Tape Automated Bonding).
When the TAB-LSI and the liquid crystal display element 10 are connected by the heat seal connector 30, the same effects as described above can be obtained by applying the present invention.

[0026]

As described above, according to the liquid crystal display device of the present invention, the insulation provided to the connection portion of the liquid crystal display element can be obtained by a simple structure in which holes are formed between the electrodes of the liquid crystal display element. The amount of the conductive adhesive can be adjusted to an appropriate amount, and the liquid crystal display element and the heat seal connector can be connected in an electrically stable state.

[Brief description of the drawings]

1A and 1B show a liquid crystal display element forming a liquid crystal display device according to an embodiment of the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA of FIG. It is.

FIG. 2 is a plan view showing a liquid crystal display element of a liquid crystal display according to another embodiment of the present invention.

FIG. 3 is a sectional view showing a liquid crystal display element of a liquid crystal display according to another embodiment of the present invention.

FIG. 4 is a sectional view showing a liquid crystal display element of a liquid crystal display according to another embodiment of the present invention.

FIG. 5 is a sectional view showing a liquid crystal display element of a liquid crystal display according to another embodiment of the present invention.

FIG. 6 is a plan view showing a conventional liquid crystal display device.

FIG. 7 is a plan view showing a heat seal connector of a conventional liquid crystal display device.

FIG. 8 is a sectional view taken along line CC of FIG. 3;

FIG. 9 is a sectional view taken along line DD of FIG. 3;

FIG. 10 is a sectional view taken along the line EE of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Liquid crystal display element 11 Connection part 11a Electrode (transparent electrode) 11b, 11d hole 11c Long hole 11e Bottom hole 20 Printed circuit board 21 Connection part 21a Electrode 30 Heat seal connector 30a, 30b Connection part 31 Polyester tape 32 Conductive adhesive 33 Insulating adhesive 34 Protective film

Claims (3)

(57) [Claims] 1. A driving circuit having a plurality of electrodes formed at predetermined intervals and outputting a signal through these electrodes, and a plurality of electrodes formed at predetermined intervals on a substrate.
Holes formed between the plurality of electrodes of the substrate
And a plurality of strip-shaped conductive adhesives respectively connecting the electrodes of the drive circuit and the electrodes of the liquid crystal display element, and a plurality of strip-shaped adhesives applied between the conductive adhesives. A heat seal connector having an insulating adhesive, wherein the holes between the electrodes of the liquid crystal display element are vertically aligned in a line, respectively.
A liquid crystal display device comprising a plurality of small-diameter holes arranged . 2. A driving circuit having a plurality of electrodes formed at predetermined intervals and outputting a signal through these electrodes, and a plurality of electrodes formed at predetermined intervals on a substrate.
Holes formed between the plurality of electrodes of the substrate
And a plurality of strip-shaped conductive adhesives respectively connecting the electrodes of the drive circuit and the electrodes of the liquid crystal display element, and a plurality of strip-shaped adhesives applied between the conductive adhesives. A heat-seal connector having an insulating adhesive, wherein the holes between the electrodes of the liquid crystal display element are each formed from a long hole.
The liquid crystal display device characterized by comprising. 3. A liquid crystal display device, wherein said liquid crystal display element is provided between electrodes.
The hole is formed to have a large diameter near the inlet.
The liquid crystal display device as described in the above.