JPS5926339Y2 - liquid crystal display device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a liquid crystal display device, and particularly relates to the structure of mounting lead fittings for external connection terminals.

In general, a liquid crystal display device has a liquid crystal disposed between electrodes, and a voltage is applied between the electrodes to change the electro-optical properties of the liquid crystal to obtain a desired display pattern.

The specific partial structure of this liquid crystal display device is shown in FIG. has been done.

Segment electrodes (not shown) and electrodes (not shown) are arranged on opposing surfaces of the upper plate 1 and the lower plate 2, and lead electrodes 4 are disposed on the segment electrodes.
is connected.

Note that lead electrodes are also connected to the electrodes of the lower plate 2, but are not shown here.

An L-shaped lead fitting 5 shown in FIG. 1 is molded onto the end of the lead electrode 4 using a conductive adhesive 6.

Further, an organic adhesive 7 is molded to cover the connecting portion between the lead electrode 4 and the lead fitting 5.

However, in a liquid crystal display device having such a configuration, when the lead metal fitting 5 and the lead electrode 4 are electrically connected using the conductive adhesive 6, the conductive adhesive 6 is used between the lead metal fitting 5 and the lead electrode 4. is difficult to flow into.

As a result, the area of the bonded portion between the two becomes small, resulting in incomplete electrical connection and poor conductivity.

Moreover, the adhesive strength of the conductive adhesive 6 is not sufficiently exhibited, and the mechanical strength for mechanically fixing the lead fitting 5 is also reduced.

Further, since the structure of the lead metal fitting 5 is simply L-shaped, when external stress acts on the lead metal fitting 5, stress acts directly on the connecting portion of the lead metal fitting 5, and there is a problem that the node metal fitting 5 easily comes off.

In order to eliminate such drawbacks, Fig. 2a.

A liquid crystal display device and its lead metal fittings shown in FIG. 1B have been proposed.

That is, in FIG. 2a, a lead metal fitting 8 that sandwiches the upper plate 1 and the lead electrode 4 is arranged in the liquid crystal display device, and the part where this lead metal fitting 8 connects with the lead electrode 4, that is, the connection plate part 80 A conductive adhesive 6 is molded on the holder.

The part where this lead metal fitting 8 presses the upper plate 1 from above, that is, the reinforcing plate part 81 and the part where this lead metal fitting 8 faces the side edge of the upper plate 1, and the conductive adhesive 6 and the organic adhesive 7 It is molded by.

Further, FIG. 2 is an enlarged perspective view of the lead metal fitting 8, and in the same figure, the parts that come into contact with the lead electrode 4 are 80a and 80.
0b, and the portions 81a and 81b are in contact with the surface of the upper plate 1 opposite to the lead electrode 4.

As shown in this figure, a part of the lead fitting where the lead fitting 8 and the lead electrode 4 come into contact is divided into 802 and 80b, and a gap 82 is provided between 80a and 80b.

Therefore, the conductive adhesive 6 flows into the gap 82, increasing the contact area between the node electrode 4 and the conductive adhesive 6, increasing the electrical reliability between the lead fitting 8 and the lead electrode 4, and increasing the electrical reliability between the lead fitting 8 and the lead electrode 4. Also, the lead fitting 8 can be more firmly fixed mechanically.

In addition, since the bends are formed by 80C and 80d, the conductive adhesive 6 flows into the bends, and the contact area between the lead electrode 4 and the conductive adhesive 6 further increases, and the lead fitting 8 is electrically and Mechanically more reliable connection.

Here, the gap 82 is the conductive adhesive 6 of 80C, 80a.
This makes it easy to transfer to the department.

Furthermore, in order to mechanically and strongly fix the lead metal fitting 8, the lead metal fitting 8 has a reinforcing plate part 81, and the upper plate 1 is sandwiched between this reinforcing plate part 81 and the connecting plate part 80. , the strength against external stress applied to the lead fitting 8 is increased.

Further, like the connection plate part 80, the reinforcing plate part 81 is also provided with a gap 83, so the organic adhesive 7 flows into the gaps 83, 81C, and 81d, and the lead metal fitting 8 is Mechanical strength is significantly improved.

Furthermore, when external stress is applied to the 84th part of the lead fitting 8, the external stress is absorbed at the 85th part because the reinforcing plate part 81 and the connecting plate part 80 sandwich the upper plate 1 as described above. Ru.

Therefore, even if external stress is applied, the conductive adhesive 6 and the parts 80a and 80b of the lead metal fittings to 81
Since it does not touch the parts a and 81b, the lead fitting 8 and the upper plate 1 can be mechanically reliably and strongly fixed, and the lead fitting 8 and the upper plate 1 can be connected mechanically and reliably. be able to.

As described above, the lead metal fitting 8 and the liquid crystal display device proposed above have great advantages, but even with this configuration, they also have disadvantages.

That is, when a liquid crystal display device is attached to a printed circuit board or the like by soldering its lead fittings, the lead fittings 8 and the lead electrodes 4 are heated, and therefore the adhesive is also heated.

Since the conductive adhesive 6, the organic adhesive 7, and the lead fitting 8 have different coefficients of thermal expansion, distortion and deformation occur among them.

As a result, the connection between the node electrode 4 and the lead fitting 8 becomes defective, and the life of the liquid crystal display device is shortened.

Therefore, the present invention provides a liquid crystal display device in which poor connection between lead electrodes and lead fittings is avoided.

In order to achieve this objective, the present invention molds the parts of the lead fitting other than the connecting plate with adhesive.
Examples will be described below.

FIG. 3 shows an embodiment of a liquid crystal display device according to the present invention,
The same parts as in FIGS. 1 and 2 are given the same reference numerals.

In the figure, a connection plate 80 of a lead metal fitting 8 is in contact with the lead electrode 4, and a lead metal fitting 8 is attached to the back surface of the upper plate 1.
The reinforcing plate portions 81 are in contact with each other.

The connecting plate part 80 and the reinforcing plate part 81 sandwich the upper plate 1 by their spring force.

The feature of this embodiment is that the parts of the lead fitting 8 other than the connecting plate part 80 are molded with an organic adhesive 7.

Note that although the reinforcing plate portion 81 of the lead fitting 8 is provided with the above-mentioned gap, the connection plate portion 80 may or may not have the above-mentioned gap.

As described above, according to this embodiment, since no adhesive is applied to the lead electrode 4 and the connection plate portion 80 of the lead metal fitting 8,
Distortion and deformation due to differences in thermal expansion coefficients do not occur significantly, and therefore, poor connection between the lead electrode 4 and the lead fitting 8 can be prevented.

Therefore, the life of the liquid crystal display device can be extended.

Although the above embodiment has been described with emphasis on the connection between the lead electrode and the lead fitting, it goes without saying that the attachment strength of the lead fitting is sufficiently strong in this embodiment.

Furthermore, in the above embodiment, the reinforcing plate portion 8
Although the reinforcing plate portion 81 is bent in this embodiment, the entire reinforcing plate portion 81 may be brought into close contact with the upper plate 1, and the spring force of the lead metal fitting 8 can be maintained even with this configuration. Thus, the node fitting 8 can be connected to the lead electrode 4 only by the spring force.

Further, in the above embodiment, the connecting plate portion 80 is bent into a curved shape as shown in the figure, but in this embodiment, the connecting plate portion 80 may be formed into a wave shape. The spring force of the lead fitting 8 can be maintained, and the lead fitting 8 can be connected to the lead electrode 4 only by the spring force.

In summary, in the above embodiment, the organic adhesive 7 was filled between the node metal fitting 8 and the side of the upper plate 1 as shown in the figure, but in this example, the organic adhesive 7 was filled between the lead metal fitting 8 and the side of the upper plate 1. The parts may be brought into close contact with each other, and even with this configuration, the desired effect can be obtained.

Further, in the above embodiment, the lead fittings and lead electrodes attached to one plate 1 have been described, but in this embodiment, the lead fittings and lead electrodes on the lower plate 2 may also have a similar configuration.

Further, in the above embodiment, an organic adhesive was used as the adhesive, but in this embodiment, an inorganic adhesive, solder, metal, etc. may also be used. It may be anything that can be fixed, that is, a fixed object.

As explained above, according to the liquid crystal display device according to the present invention, the connecting plate part is slidably connected to the lead electrode by using the spring force between the reinforcing plate part of the lead fitting and the connecting plate part,
Since the parts of the lead fittings other than the connection plate are fixed with adhesive, connection failures between the lead electrodes and the lead fittings due to differences in thermal expansion coefficients between the adhesive and the lead fittings are prevented, thereby extending the life of the liquid crystal display device. This has the great effect of increasing the length of time.

[Brief explanation of the drawing]

Fig. 1a is a sectional view showing a part of a liquid crystal display device, Fig. 1 is a perspective view of a lead fitting, Fig. 2a is a sectional view showing a part of a proposed liquid crystal display device, Fig. 2 2 is a perspective view of a node fitting used in the liquid crystal display device of FIG. 2a, and FIG. 3 is a partial sectional view showing an embodiment of the liquid crystal display device according to the present invention. 1...Top plate, 4...Lead electrode, 7.
...Organic adhesive, 8...Lead fittings,
81... Reinforcement plate part, 80... Connection plate part.

Claims (1)

[Scope of utility model registration request] An upper plate and a lower plate facing each other, electrodes provided on opposing surfaces of the upper plate and the lower plate, lead electrodes electrically connected to the electrodes, and an end surface of the upper plate or the lower plate. A liquid crystal display device comprising: a node metal fitting having a connecting plate portion and a reinforcing plate portion that sandwich the lead electrode and the back surface of the end face formed on the top plate; and a liquid crystal sealed between the top plate and the bottom plate. , a liquid crystal display device characterized in that the connecting plate portion is slidably in contact with the node electrode only by the spring force of the lead fitting, and the reinforcing plate portion is fixed to the back surface portion with an adhesive. .