JPS5960420A - Multi-layered type liquid crystal display device - Google Patents

Abstract

PURPOSE:To facilitate a connection with an external signal circuit by inserting and holding a wiring member between substrates in an element and the terminal part of an external wiring member for external signal input in one body between electrode substrates of the element. CONSTITUTION:Three substrates, i.e. glass substrates 44 and 45 having transparent electrodes 44 and 45 on one side and a glass substrate 42 having transparent electrodes 46a and 46b on both sides are sealed by sealing members 47a and 47b, and liquid crystal layers 49a and 49b are injected to constitute a two- layered type LCD. An inner connector 48 are pressed in and held at end parts of the substrates 41 and 43. The connector 48 consists of a conductive part 48a made of elastic material and an insulating part 48b and a cut 48c is formed. A flat cable 40 cnsists of insulating material 40b and a conductive part 40a interposed flatly therein, and the connector 48 is pressed in between the substrates 41 and 43 so that the terminal part having the coductive part 40a exposed is inserted into the cut 48c of the connector 48.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a multilayer liquid crystal display device constructed by laminating liquid crystal display elements in multiple layers, and particularly relates to an improvement in the wiring structure thereof.

[Technical background of the invention and its problems]

Conventional multilayer liquid crystal display element (hereinafter referred to as multilayer LCD)
A multi-glaze structure has been proposed for the installation method of external signal input terminals.

The first method is to provide external signal input terminals (hereinafter simply referred to as input terminals) on the surface of a plurality of single-pole boards, and simultaneously connect them to the input terminals on each surface (g. The interconnector section between the input method (LCI) and the external signal circuit plays an important role. Typical examples are shown in FIGS. 1 and 2. In FIGS. 1 and 2, (,) shows a plan view, (b) shows a sectional view, and (c) shows an interconnector. Glass substrates 11, 12.ノ3, 21.22゜23
Electrodes 14, 15, 16, 17 formed above.

Liquid crystal layer 191 between 24, 25, 26, and 27.

192 r 291 1292 are held, and the electrodes 14, 15, 24.25 are provided with input ψW terminals at the ends of their respective substrates. These input terminals are provided at substantially the same positions on the respective boards, and are connected to one externally provided signal circuit via interconnectors 18 and 28. This interconnector 18.28 has a structure in which a conductive part 18ar288 and an insulating part 18b, 28b are laminated alternately.
4. In order to connect between 15 and 24
．． It has a U-shaped cross section in order to connect between 25 and 25. The laminated structure of this interconnector has conductive anisotropy with high insulation in the lamination direction and conductivity in the direction perpendicular to the lamination direction, and has a striped appearance when viewed from a certain direction. Commonly known as zebra connector.

However, the two-layer LC with the structure shown in FIGS. 1 and 2
Since D uses this zebra connector type interconnector to make pressure contact with an external signal circuit, uniform pressure is always required for the pressure contact, and a special shape of the interconnector is also required, resulting in low precision machining and conductivity. This has the major drawback that contact between the parts is uncertain and an effective electrical connection cannot be obtained.

Moreover, the second method does not require an interconnector, which has the drawbacks mentioned above, and has no interconnector inside the display element.

This is a method in which an inter-board wiring member is provided as a branch circuit for the air signal. An example previously proposed by the present inventors is shown in FIG.

(a) is a plan view, (b) is a sectional view, (c) is an enlarged view of an inter-board wiring section, and (d) is an enlarged view of an inter-board wiring member.

As shown in the figure, transparent 'i@I poles 34, 35, 37 are provided on one glass substrate 31, 32, 33, and a liquid crystal layer 3 is provided between the substrates.
In the two-layer LCD holding 91.392, an input terminal portion integral with the 1-to-4 poles 34 is provided at the end of the substrate 31, and a substrate 31.3 facing the intermediate substrate 32 is provided.
An inner connector 36 serving as an inter-substrate wiring part within the Ic element is press-fitted and held at the opposing surface end of the second Ic element. This inner connector 36 has a conductive portion 3 as shown in (d).
This is a zebra connector made of an elastic material in which 6g and insulating parts 36b are alternately laminated, and this makes an IIR, sharply curved connection between the rod poles 34 and 35. Therefore, only the transparent type 4'Ms4 on the glass substrate 3 is input If':I+i
Even when the two liquid crystal layers 391 and 392 are connected to each other, voltage can be applied to the two liquid crystal layers 391 and 392. However, in this case as well, voltage is applied from part of the electrodes on the substrate 31, 33 to the electrode 37 on the substrate 32 via a conductive member called a transfer, as in a normal single-layer LCD.゛Of course. As described above, the second method is a very advantageous method in terms of implementation because it uses an intra-element inter-substrate wiring member as shown in FIG. However, even in the second method, it is conventionally necessary to install an external wiring member for inputting signals from an external signal circuit to the element, separately from the inter-board wiring member. This is complicated in the LCD manufacturing process and mounting process. For example, if a planar flexible wiring board or a flat cable is used as the external wiring member, the terminal part of the flat cable can be connected to the signal input terminal part on the board 3 in Fig. 3 by thermocompression bonding (heat sealing). ,
Alternatively, it was necessary to hold both terminals in pressure contact with each other using clips.

[Purpose of the invention]

The present invention improves the shortcomings of the conventional methods described above. It facilitates connection with external signal circuits, prevents poor contact at the connection part, and realizes easy mounting workability and reliability. The object is to provide a multilayer liquid crystal display device.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention has a structure in which the inter-substrate wiring member within the element and the terminal portion of the external wiring member for external signal input are integrated and held between the electrode substrates of the -C element. be.

As the inter-board wiring member in the present invention, for example, an inner connector made of an elastic material in which conductive parts and insulating parts are alternately laminated is used. Further, as the external wiring member, a so-called flat cable, a flexible saw board, or the like in which isoelectric members are arranged in a planar manner is used. The outer WIS wiring member arranged in a planar manner is made in advance according to the electrode terminal pitch of the LCD, and the terminal part is connected to the conductive part of the wiring part between the inner board of the LCD system. By contacting or adhering the 2-JM layered LCD and press-fitting it between the electrode boards, there is no need to connect to the input terminals on either board of the 2JM layer type LCD, unlike conventional mounting work. It becomes possible to apply a voltage directly to the terminal portion.

〔Effect of the invention〕

Since the inter-board wiring member and the external wiring member are integrally connected, it is extremely easy to apply a signal voltage to the electrode terminal, and the mounting work can be completed in a short time. This makes it easier to connect the wires.

[Embodiments of the invention]

An example in which the present invention is applied to a two-layer LCD is shown in FIG.
), the inner connector as the inter-board wiring member and the flat cable as the external wiring member are shown in the same figure <b) e (c), respectively. As shown in FIG. 4(,), there are four glass substrates each having a thickness of 0.7 mm and having transparent electrodes 44 and 45 formed on one side thereof.

43 and a glass substrate 42 with a thickness of 0.7 m with transparent electrodes 46m and 46b formed on both sides, are sealed with sealants 47m and 47b. A zebra connector-shaped inner connector 48 is press-fitted into the end of the substrate 4 and 43 to form a two-layer type LCr). This inner connector 48 has a thickness of 0.6 wn, and as shown in FIG. 4(b), it consists of a diaphragm section 48a and an insulating section 48b made of an elastic material, and a notch 48c is provided on one end surface thereof. ing.

Further, as shown in FIG. 4(C), the flat cable 40 is composed of a planar insulating material 40b and a conductive portion 40m having a thickness of 0.2 rnn disposed therein in a planar manner.
'+M's insulator 40b has been removed to expose about one fin of the conductive part 40a, and the terminal part is inserted into the notch 48 of the inner connector 48.
Boards 41 and 43 with a gap of 0.7 cm when inserted into e.
An inner connector 48 is press-fitted between them.

According to this example, the mounting work was easy and could be realized in a short time, and the reliability of the obtained LCD was also sufficiently high. In this embodiment, the thickness of the inner connector 48 is made slightly smaller than the distance between the electrode substrates 41 and 43 of the two-layer LCD, and the difference is also slightly thicker.
By using the flat cable 40 with a length of 0 m, the portion of the thin inner connector 48 that receives the compression Y-shape is only the portion corresponding to the terminal portion of the flat cable 40, so that other portions do not need to be deformed. Become. For this reason,
The force applied to the seal portion of the LCD to compress the inner connector 48 is less than the conventional case of deforming the whole as shown in FIG. 3, and the life of the seal portion can be greatly extended. Furthermore, in order to supplement the mechanical strength, a part of the flat cable 40 was adhesively fixed to the edge of the board, making it possible to obtain an electrical connection with even higher vibration resistance.

In the above embodiment, an elastic zebra connector was used as the wiring member between MM, but as shown in FIG.
2 made of thermosetting rosin or thermoplastic resin on both sides of 0m! ′! , a two-layer LC is formed by applying a thick layer of electrically conductive adhesive 58.
It is also effective to attach the insert 1 to the end of the board D and use it as an inter-board wiring member. In particular, this method is suitable for two-layer LC
When the distance between the electrode substrates of D is thin (for example, 0.55 mm,
0.3 mm, etc.), the workability was significantly improved and effective. It goes without saying that the present invention can also be applied to a stacked liquid crystal display device with three or more layers in a similar manner and is effective.

[Brief explanation of drawings]

Figures 1 (,) to (c) and Figures 2 (,) to (c) are for explaining a conventional two-layer liquid crystal display device; FIG. 3 is a diagram showing the inter-board wiring member and the extrapolation wiring member of the embodiment. 41.42.43...Glass substrate, 44,45°46
a, 46b...Transparent electrode, 48...Inner carp,
Lid (board ri-iJ wiring part removed), 40.50... flat cable (external wiring member), 58... conductive adhesive (inter-board wiring member). (in Figure 1) (b (c)

Claims (4)

[Claims] (1) At least three 'rfLwL substrates are arranged facing each other, a liquid crystal is held between these electrode substrates, an inter-board wiring member for applying an input signal to each opposing electrode is provided in the element, and an external signal circuit is provided. In a multilayer liquid crystal display device provided with an external wiring member for inputting signals from the external wiring member to the element, the inter-board wiring member and the terminal portion of the external wiring member are integrally inserted and held between the electrode substrates. A multilayer liquid crystal display device characterized by: (2) The inter-board wiring member is a connector made of an elastic material in which conductive parts and insulating parts are alternately laminated, and the external wiring member is a flexible wiring board or a flat cable, and these are integrated into the The multilayer liquid crystal display device according to claim 1, wherein the multilayer liquid crystal display device is press-fitted between electrode substrates. (3) The distance between the electrode substrates is slightly larger than the thickness of the connector, and is slightly smaller than the thickness of the overlap between the connector and the terminal portion of the flexible wiring board or flat cable. A multilayer liquid crystal display device according to claim 2. (4) the inter-board wiring member is a conductive resin adhesive;
The external wiring member is a flexible wiring board or a flat cable, and the adhesive is inserted between the electrode boards while being integrated with the terminal part of the flexible wiring board or the flat cable to perform inter-board wiring. A multilayer liquid crystal display device according to claim 1, characterized in that: