JPS61190375A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a liquid crystal display device, and particularly to the structure of a conductive member that electrically connects a liquid crystal display element and its drive circuit mounting board. .

[Background of the invention]

Generally, in a liquid crystal display device, in order to electrically connect a liquid crystal display element (hereinafter referred to as an element) that displays information in a pattern and a drive circuit mounting board (hereinafter referred to as a substrate) that drives this element, a conductive A conductive rubber composed of alternately laminated bodies and insulating rubber is compressed and held between the electrode terminals of the element and the substrate, which are arranged facing each other, to electrically connect each electrode terminal of both. It was conducting.

The structure of such a liquid crystal display device is disclosed in, for example, Japanese Utility Model Application Publication No. 10563/1983 and Publication No. 50707/1983.
It is described in detail in the publication.

However, in recent years, as devices have become larger and the number of terminals has increased, and the pitch between terminals has become smaller, problems such as electrical shorts between terminals have arisen when using the aforementioned conductive rubber. do.

As shown in Figure 1, the solution to this problem is a band-shaped conductive part 1 made of a synthetic rubber mixture of carbon and talc powder, and a band-shaped insulating part 1 made of a synthetic rubber mixture of talcum powder. A heat seal connector has been proposed in which portions 2 are alternately arranged on a planar support 3 made of polyester film.

The heat seal connector configured in this way has a second
As shown in Figures (a) and (b), the tip of the heat-sealed connector 4 is placed on the electrode terminal portion 8 in which a large number of electrode terminals 7 are formed and arranged at the end of the upper electrode substrate 6 constituting the element 5. are arranged, the electrode terminal 7 and the conductive part 1 are aligned, and the electrode terminal 7 and the conductive part 1 are heated and pressed from the outer surface to be electrically connected at the double diagonal line shown in FIG. Further, the other end of the heat-seal connector 4 is similarly electrically connected to an electrode terminal portion of the board, although not shown.

Note that such an electrical connection structure is disclosed in, for example, Japanese Patent Application Laid-open No. 5
It is described in detail in Japanese Patent No. 5-69186.

However, in recent years, with the increase in the size of the element 5, the number of electrode terminals 7 has increased significantly to approximately 6402 lines on the signal side and 200 to 256 lines on the scan side, and the pitch P between each electrode terminal 7 has increased. In liquid crystal display devices that are extremely small, with a time of approximately 0.4 ms or less, electrical connection using the heat seal connector 4 described above is extremely effective. Electrode terminal T
3(a) and 3(b), the upper side of a liquid crystal display device is constructed by arranging an element 5 and a substrate 9 facing each other.

Electrode terminal portions 10a, 10 are provided at three locations on the bottom and left side.
b and 10c, three electrode terminal portions 10a + 10b * by the heat seal connector 4 are provided.
There were problems such as assembly into 10e and its connectivity became extremely difficult.

[Purpose of the invention]

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its object is to provide a device on an element and a substrate that are arranged opposite to each other.

It is an object of the present invention to provide a liquid crystal display device that can be easily assembled and connected to lower and side three-way electrode terminal portions.

[Summary of the invention]

In order to achieve such an object, the present invention provides a heat seal connector in which conductive parts are provided on both sides of a support body and are electrically connected via through holes, and one side is connected to an electrode terminal of an element. and the other side is connected to the electrode terminal portion of the substrate.

[Embodiments of the invention]

Next, embodiments of the present invention will be described in detail using the drawings.

FIG. 4 is a diagram showing an example of a heat seal connector used in a liquid crystal display device according to the present invention, in which FIG. Figure (e) is a sectional view taken along line cc' in figure (a). In these figures, the heat-seal connector 11 is constructed by photopatterning a heat-resistant resin film lla, such as polyimide resin, on which copper foil is adhered or copper-plated, and patterned conductive portions 11b at predetermined intervals are formed on the upper surface of the heat-sealed connector 11. and an adhesive part formed at a predetermined position on the back side, and on the surface of both ends of these parts, carbon fibers or gold JiJ7 fibers are dispersed in thermoplastic polymer resin such as synthetic rubber, vinyl ethyl acetate copolymer, and acrylic resin. 11c is 20-30μm
The resin film Ila is coated to a thickness of
Noha t! At the center, corresponding conductive parts 11b formed on the top and back sides are electrically connected via through-hole parts 11d arranged in a staggered manner. That is, the conductive portion 11b is formed on the upper surface side of the left side portion of the resin film 11m, and the conductive portion 11b is formed on the back side of the right side portion of the resin film 11m.
1b are connected to each other by a through-hole portion 11d approximately in the center.

In the parts other than the TFC adhesive part 11e, the resin film l1m and the patterned conductive part 11b are connected to the insulating film 11.
It is coated with a thick coating.

As shown in the cross-sectional view in FIG. 5, the heat seal connector 11 configured in this manner has one end placed on the electrode terminal portion 8 of the element 5 so that the electrode terminal T and the conductive portion 11b are aligned with each other. , Heat and press in the direction of the arrow to fix. In this case, 20-4 Q Kg/at 160-180℃
Heat and pressure bonding is carried out under conditions of approximately "cnr".

In this case, the electrical connection between the heat-seal connector 11 and the electrode terminal portion 8 of the element 5 is achieved by heat-pressing the heat-seal connector 11 and the electrode terminal portion 8 of the element 5, as shown in the enlarged sectional view of the main part in FIG. The bonded portion 11c between the portion 11b and the electrode terminal γ on the electrode substrate 6 is compressed, and the carbon fibers dispersed within this bonded portion 11c come into contact with each other, and the conductive portion 11b and the electrode terminal 7 are electrically connected. will be connected. On the other hand, the conductive portion 11b and the bonded portion 11a in the area where the electrode terminal T is not present are not compressed to the extent that the carbon fibers come into contact with each other, so that there is no electrical conduction. In this way, heat seal connector 1
1 as shown in FIG.
0a, 10b r 10c, as shown in the enlarged sectional view of the main part in FIG. The electrode terminals 14 and the conductive portions 11b are arranged on the electrode terminal portions 13 of No. 9 in alignment with each other, and fixed by heating and pressing in the direction of the arrow E under the same conditions as described above.

In this case as well, the other side of the heat seal connector 11 has three electrode terminal portions 10a on the substrate 9, as shown in FIG.

10b and 10c, and the connection structure is the 6th one.
Electrical connections will be made with the same structure as shown in the figure.

According to such a configuration, it becomes easy to electrically connect the three-way relaxed terminals fR510m, 10b, and 10c between the element 5 and the substrate 9, and it becomes possible to perform automated assembly with easy assembly.

〔Effect of the invention〕

As explained above, according to the present invention, the heat sheet connector is configured by providing patterned conductive parts on both sides of the support and electrically connecting the corresponding conductive parts to each other via through holes. Additionally, since the connection and assembly between the three-way electrode terminal portions of the nine liquid crystal display elements and the drive circuit mounting board, which are arranged facing each other, is facilitated, the reliability of the connection can be greatly improved. Extremely excellent effects can be obtained.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a main part showing an example of a conventional heat seal connector, and Figures 2 (a) and (b) are main parts showing an example of a heat seal connector connected to an electrode terminal part of a liquid crystal display element by thermocompression. Plan view, BB' sectional view, Figure 3(a)
, (b) is a plan view illustrating the connection of the heat seal connector to the three-way electrode terminal portion of the liquid crystal display element and the drive circuit mounting board arranged to face each other, and its B-B'
FIG. 4(a) is a sectional view, FIG. 4(c) is a plan view of a heat seal connector related to a liquid crystal display device according to the present invention, its BB' sectional view, its c-c' sectional view, and FIG. figure,
FIGS. 6 and 7 are enlarged sectional views of essential parts for explaining an embodiment of a liquid crystal display device according to the present invention. 5... Liquid crystal display element (element), 6... Upper electrode substrate, 1... Electrode terminal, 8... Electrode terminal portion, 9...
... Drive circuit mounting board (substrate), 10a, 10b, 1
0c... is the pole terminal part, 11... is the heat seal connector, 11a... is the resin film, 11b... is...
Conductive part, 11c...adhesive part, 11d...through hole L12...φ spacer, 13...electrode terminal part, 14...electrode terminal. Agent Patent Attorney Ogawa M Figure 1 Figure 2 (b) Figure 5

Claims (1)

[Claims] An electrode terminal part of a liquid crystal display element that displays information in a pattern;
In a liquid crystal display device in which a heat-seal connector is thermocompression-bonded and electrically connected to an electrode terminal portion of a drive circuit mounting board for operating the liquid crystal display element, the heat-seal connector has conductive parts on both sides of a support. The conductive parts on one side of the heat seal connector are connected to the electrode terminal part of the liquid crystal display element, and the conductive part on the other side is connected to the electrode terminal part of the drive circuit mounting board. A liquid crystal display device characterized by being connected to each other by thermocompression bonding.