JPH08271917A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: To make it possible to connect liquid crystal display elements to heat sealing connectors in an electrically stable state by adjusting the amt. of the insulatable adhesives supplied to the junctures of the liquid crystal display elements to an adequate amt. by the simple constitution forming holes between the respective electrodes of the liquid crystal display elements. CONSTITUTION: This liquid crystal display device is constituted by having the liquid crystal display elements 10 which have plural electrodes formed apart prescribed spacings, driving circuits for outputting signals via these electrodes, plural electrodes 1a formed apart prescribed spacings and the holes 11b respectively formed between these electrodes and the heat seal connectors which have the plural band-shaped conductive adhesives respectively connecting these driving circuits and the respective electrodes 11a of the liquid crystal display elements 10 and the plural band-shaped insulatable adhesives selectively applied between these conductive adhesives.

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 drive circuit for driving the same are connected by a heat seal connector, and particularly, 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. Further, FIG. 8 is a sectional view taken along line CC of FIG. 6, and FIG. 9 is taken along line DD of FIG.
FIG. 10 is a sectional view taken along line EE of FIG.

As shown in FIG. 6, a conventional liquid crystal display device 1
00 denotes the liquid crystal display element 110 and the liquid crystal display element 11
The printed circuit board 20 on which the 0 drive circuit 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.

At the connecting portion 111 of the liquid crystal display element 110,
As shown in FIGS. 6 and 8, a plurality of electrodes (transparent electrodes) 111a are formed at predetermined intervals, and the connecting portion 21 of the printed circuit board 20 has a plurality of electrodes as shown in FIGS. A plurality of electrodes 21a were formed at a predetermined interval.

The heat seal connector 30 is shown in FIG.
Also, as shown in FIG. 10, a plurality of strip-shaped conductive adhesives 32 and insulating adhesives 33 are formed on the polyester tape 31.
Are separately applied by a printing method, and a protective film 34 is attached to the central portion of the polyester tape 31, and 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 the heat seal connector 30 is as follows.
It was done as follows. First, the connection parts 30a and 30b of the heat seal connector 30 are connected to the connection parts 11 of the liquid crystal display element 110 and the printed circuit board 20, respectively, so that the conductive adhesive 32 and the electrodes 111a and 21a correspond to each other.
Overlay 1,2. In this state, the connecting portion 30a,
When the 111 and the connecting portions 30b and 21 are thermocompression bonded, 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 connected by the insulating adhesive 33. To be glued.

[0007]

In the conventional liquid crystal display device described above, the electrode 111 of the liquid crystal display element 110 is used.
The wall thickness of a = about 0.01 μm to 0.1 μm, while the wall thickness of the electrode 21a of the printed board 20 = about 15 μm to 40 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 required for connecting the liquid crystal display element 110 and the insulating adhesive 33 required for connecting the printed circuit board 20. There is also a difference in the amount of.

That is, the connecting portion 21 of the printed circuit board 20.
Since the electrode 21a has a large thickness, a large amount of the insulating adhesive 33 is added to compensate for a large step between the electrode 21a and the base surface.
In contrast to the above, the connection portion 1 of the liquid crystal display element 110 is required.
In No. 11, since the electrode 111a is thin, the electrode 111a
The level difference between a and the base surface is small, and only a small amount of insulating adhesive 33 is required.

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

Therefore, in the conventional liquid crystal display device, the thickness of the insulating adhesive 33 is set according to the electrode 21a of the printed board 20 (see FIG. 10), and the thin electrode 111a is formed. Connection part 111 of liquid crystal display element 110
In, the excess insulating adhesive 33 is replaced by the conductive adhesive 32.
There was a problem that the electrical connection became unstable because it protruded to the side.

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

By applying this technique, that is, by applying an appropriate amount of the insulating adhesive 33 in advance between the electrodes 21a of the printed circuit board 20, the thickness of the insulating adhesive 33 of the heat seal connector 30 is set to the electrode thickness. If the thickness corresponding to the thickness of 111a is adopted, the connection 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 connecting portions 21 of the printed circuit board 20.

However, in reality, the step of applying the insulating adhesive 33 in advance between the electrodes 21a of the printed circuit board 20 is increased, and the insulating adhesive 33 does not protrude to the electrode 21a side, and the insulating adhesive 33 does not protrude. It was very difficult to apply 33 between the electrodes 21a, and it was impossible to apply the above technique.

The present invention has been made in view of the above problems, and the amount of the insulating adhesive supplied to the connecting portion of the liquid crystal display element can be adjusted to an appropriate amount with a simple structure. An object of the present invention is to provide a liquid crystal display device capable of connecting a display element and a heat seal connector in an electrically stable state.

[0016]

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 drive for outputting a signal via these electrodes. A circuit, a plurality of electrodes formed at predetermined intervals, and a liquid crystal display element having holes formed between these electrodes, and an electrode of the drive circuit and an electrode of the liquid crystal display element, respectively. A plurality of strip-shaped conductive adhesives, and a heat-seal connector having a plurality of strip-shaped insulating adhesives coated between the conductive adhesives, preferably, the liquid crystal A plurality of small-diameter holes are formed between the electrodes of the display element, or a long hole is formed between the electrodes of the liquid crystal display element.

[0017]

According to the liquid crystal display device of the present invention having the above structure, the excess insulating adhesive supplied to the connecting portion of the liquid crystal display element is
It flows into the holes formed between the electrodes of the connection portion, and is adjusted to an appropriate amount necessary for adhesion. In addition, when a long hole is formed between the electrodes or a plurality of holes are formed, the excess insulating adhesive smoothly flows into the holes, and the insulation is more effective. The amount of the functional adhesive can be adjusted.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An 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.
The figure (a) is a top view and the figure (b) is an AA sectional view of (a).

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 connecting portion 11 thereof has a plurality of electrodes (transparent electrodes) at predetermined intervals. ) 11a is formed. And these electrodes 11
Between the holes a, three holes 11b, 11b, 11b are formed in a state of being aligned in a vertical line.

A drive circuit for driving such a liquid crystal display element 10 is mounted on a printed board 20 similar to the conventional one as shown in FIGS. 6 and 9, and these liquid crystal display element 10 and the printed board are mounted. The heat-seal connector for connecting 20 has the same structure as the conventional heat-seal connector 30 as shown in FIGS. 7 and 10. Therefore, the film thickness of the insulating adhesive 33 of the heat seal connector 30 is also the electrode 2 of the printed circuit board 20 as shown in FIG.
It has a thickness corresponding to 1a.

According to the liquid crystal display device of the present embodiment having such a structure, the excess insulating adhesive 33 supplied to the connecting portion 11 of the liquid crystal display element 10 is removed in the thermocompression bonding process of the heat seal connector 30. , Into the holes 11b formed between the electrodes 11a, respectively, and 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.

Further, in the present liquid crystal display device, each electrode 11a is
Since the three holes 11b, 11b, 11b are provided between them, the excess insulating adhesive 33 smoothly flows into these three holes 11b, 11b, 11b, and the insulating property is improved more effectively. The amount of 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, 11 are provided between the electrodes 11a of the liquid crystal display element 10.
Although the structure in which b is provided is provided, as shown in FIG. 2, the elongated holes 11c may be formed between the electrodes 11a.

Further, as shown in FIG. 3, the hole 11d may be constructed such that the diameter near the inlet is increased. With such a configuration, excess insulating adhesive 33 is likely to enter the hole 11d. Furthermore, as shown in FIG. 4 or FIG.
All or some of the plurality of holes may be the bottomed holes 11e.

The liquid crystal display device 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, but the drive circuit 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 to each other by the heat seal connector 30, the same effects as 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 is formed by the simple structure of forming the holes between the respective 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 drawings]

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

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

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

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

FIG. 5 is a cross-sectional view showing a liquid crystal display element of a liquid crystal display device 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.

9 is a cross-sectional view taken along the line DD of FIG.

10 is a cross-sectional view taken along line EE of FIG.

[Explanation of symbols]

 10 Liquid Crystal Display Element 11 Connection Part 11a Electrode (Transparent Electrode) 11b, 11d Hole 11c Long Hole 11e Bottomed 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)

[Claims] 1. A drive circuit which has a plurality of electrodes formed at predetermined intervals and outputs a signal through these electrodes, a plurality of electrodes formed at a predetermined interval, and a plurality of electrodes of these electrodes. A liquid crystal display element having holes formed respectively between them, 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 between these conductive adhesives A liquid crystal display device comprising: a heat-seal connector having a plurality of strip-shaped insulating adhesives which are separately painted. 2. The liquid crystal display device according to claim 1, wherein a plurality of small-diameter holes are formed between the electrodes of the liquid crystal display element. 3. The liquid crystal display device according to claim 1, wherein elongated holes are formed between the electrodes of the liquid crystal display element.