JPH0219927B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device using a two-layer liquid crystal cell.

Generally, in this type of liquid crystal display device, a large number of transparent external electrodes are provided on a glass substrate.
Power is supplied to these external electrodes by connecting lead wires to each external electrode via clip pins. These lead wires are connected, for example, to corresponding connection portions of predetermined printed wiring on a printed circuit board to which the liquid crystal cell is attached, by means such as soldering.

In such a conventional structure, the pitch of the external electrodes cannot be made very small because clip pins are used as the holding means. If the size were to be made infinitely small, the clip pins would also have to be made smaller, which would reduce the clamping pressure, significantly reduce the contact pressure, resulting in poor installation stability, and the narrow pitch spacing would cause adjacent clip pins to become smaller. Contact may cause problems with the circuit configuration. Furthermore, since clip pins are individually attached to each external electrode, the process is time-consuming and has the drawback of poor mass productivity. In short, in the conventional example, there are various restrictions on how to take out the terminal from the external electrode, and there is a drawback that further miniaturization and mass production are not possible.

The present invention has been made in view of the above circumstances, and its purpose is to provide a liquid crystal display device in which it is extremely easy to take out terminals from external electrodes, and which is highly stable and mass-producible. .

The present invention has been made to achieve this purpose.
A sheet-like connector with a large number of corresponding linear conductive parts is attached to the large number of external electrodes provided on both sides of the glass substrate of the liquid crystal cell by thermocompression bonding across both sides. A liquid crystal display characterized in that a part of the conductive part of the liquid crystal cell is exposed to the outside, a conductive rubber is arranged between the wiring part of the printed circuit board, and the liquid crystal cell is mounted on the printed circuit board using a frame-shaped mounting member. In this device, the linear conductive parts of the sheet-like connector are provided at equal intervals to match the pitch of the external electrodes of the liquid crystal cell, so that the external electrodes and the linear conductive parts always match exactly and there is no misalignment. You can expect a stable connection without any
At the same time, when attaching to a printed circuit board, since conductive rubber is used, attachment using an attaching member is easy.

Next, the illustrated embodiments of the liquid crystal display device of the present invention will be described in detail.

In the figure, reference numeral 1 denotes a two-layer liquid crystal cell, in which display glass substrates 3 and 4 are laminated on both surfaces of a common glass substrate 2 in the center. On one edge 2a of the common glass substrate 2, external electrodes 5 and 6, which are transparent electrodes, are provided on both surfaces in an exposed state.
External electrodes 7 and 8 are also provided at the other end 2b. A sheet-like connector 11 as shown in FIG. 2 is used to connect these external electrodes 5, 6, 7, and 8 to serve as terminals for power supply from the outside.

In this sheet-like connector, a linear conductive portion 12 is integrally provided on one surface of an insulating and extremely thin sheet material by printing means or the like in accordance with the pitch of the external electrodes of the liquid crystal cell.
The pitch and width of this linear conductive portion 12 are as follows:
It is determined according to the external electrode of the liquid crystal cell to which it is attached.

The sheet-like connector 11 having such a configuration is
The conductive part 1 is formed into a linear conductive part 1 by providing a crease along the thickness of the end part so that it can be fitted into each end part 2a, 2b of the glass substrate 2 to be connected in advance.
2 is located on the inside, and at the same time, it is folded back to the outside so that at least one end 11a is exposed to the outside. Then, fit the sheet-like connectors 11 to both ends of the glass substrate,
The linear conductive portions 12 are brought into contact with the external electrodes 5, 6, 7, and 8, respectively, and each conductive portion and each external electrode are bonded by thermocompression to be mechanically and electrically connected. Furthermore, one folded end 11a of the sheet-like connector 11 is fixed with an adhesive 13 in order to stably maintain the folded state.

For example, conductive rubbers 14 and 15 are pressed into contact with the conductive part 12 exposed at the outwardly folded end 11a as electrodes for power supply from the outside, and the surface located above the sheet-like connector 11 is The hook-shaped frame or mounting member 16, 1 is pressed down.
7 to attach it to the printed circuit board 18. In this case, the conductive rubber is a conductive part 2 corresponding to the linear conductive part 12.
0 and non-conductive parts 21 are stacked alternately (Fig. 4), and the conductive parts are attached in contact with each other, and the conductive part 20 of each conductive rubber is placed on the printed circuit board on the other side. The structure is such that power is supplied by contacting the individual printed wirings 19. In addition, 22 and 23 in the figure are the mounting members 1.
For example, screws are used to fix the parts 6 and 17 to the printed circuit board.

In the liquid crystal display device of the present invention configured as described above, the sheet-like connector 11 is attached so that the conductive part 12 is in contact with the external electrodes 5 to 8 of the liquid crystal cell, and the conductive rubber 14, 15 is attached to the conductive part. The conductive parts 20 of the conductive rubber are arranged and assembled so as to be in contact with the corresponding conductive parts 20 of the printed circuit board, and the conductive parts 20 of the conductive rubber are in pressure contact with the printed wiring part of the corresponding printed circuit board, and this is held on the printed circuit board. The frame-shaped mounting members 16 and 17 prevent mutual misalignment between the external electrodes of the liquid crystal cell, the conductive part of the sheet-like connector, the conductive part of the conductive rubber, and the corresponding printed wiring of the printed circuit board. It is a structure.

As explained above, the present invention is a display device using a two-layer liquid crystal cell, in which a sheet-like connector is first attached to the transparent external electrode of the liquid crystal cell, and then the electrode portion is connected via the conductive part. By clearly distinguishing and identifying the conductive parts and using conductive rubber that has a conductive part and a non-conductive part in a form corresponding to the conductive part, it is possible to accurately and accurately distinguish between the printed wiring on the printed circuit board and the conductive part of the sheet-like connector. The display device is short-circuited and fixed in such a way that no blurring occurs, resulting in a highly stable display device.

Furthermore, even if the interval between the transparent external electrodes is shortened when downsizing the display device, what comes into contact with them is not a clip pin but a sheet-like connector having a conductive part that matches the interval between the external electrodes.
This sheet-like connector can be formed in any way to match the size of the liquid crystal cell, so the contact with the external electrode is accurate and strong, the power supply terminal can be taken out stably, and the external terminal and the sheet-like connector can be easily connected. At the same time, since the short circuit between the sheet connector and the printed wiring on the printed circuit board is made of conductive rubber, assembly work is also easy, and accurate and vibration-resistant products can be mass-produced. It also has this effect.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing only the main parts of a liquid crystal cell used in a liquid crystal display device according to the present invention;
FIG. 2 is a perspective view of a sheet-like connector used in the device, FIG. 3 is an enlarged sectional view of the display device, and FIG. 4 is a perspective view of conductive rubber used in the device. 1...Liquid crystal cell, 2...Common glass substrate,
3, 4...Glass substrate for display, 5-8...External electrode, 11...Sheet-like connector, 11a...
One end, 12, 20... Conductive part, 14, 15
...Conductive rubber, 16, 17...Mounting member, 18...
...Printed circuit board, 19...Printed wiring, 21...
...Non-conductive part.

Claims (1)

[Claims] 1. A sheet-like connector having a large number of corresponding linear conductive parts is attached to the large number of external electrodes provided on both sides of the glass substrate of a liquid crystal cell by thermocompression bonding across both sides, and the A liquid crystal display characterized in that a part of the conductive part of the liquid crystal cell is exposed to the outside, a conductive rubber is arranged between the wiring part of the printed circuit board, and the liquid crystal cell is mounted on the printed circuit board using a frame-shaped mounting member. Device.