JPH04204631A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide the liquid crystal display device small in weight and thickness, simple in structure and manufacture process, and adapted to enlargement in scale by using a thin substrate on one side and a rigid substrate made of glass or a material having a strength similar to glass on the other side. CONSTITUTION:The upper substrate 1 is a film substrate made of a heat resistant polyether-sulfone and the lower substrate 2 is made of glass. Each of the substrates 1, 2 is parallel to and opposite to each other and each substrate 1, 2 is adjacent to each of image element electrodes 3, 4 and wirings 5 and each of orienting films 7, 8 in these order to form an XY matrix, and the liquid crystal composition 10 is held between both substrates 1, 2 by arranging spacers 11 between them and sealing and bonding members coated with adhesives on the surfaces on 4 sides around the XY matrix zone.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a liquid crystal display device having a simple structure and having a lightweight and thin liquid crystal display element.

(Prior Art) FIG. 4 is a side sectional view of a conventional liquid crystal display device, and FIG. 5 is a perspective view of the conventional liquid crystal display device.

As shown in the figure, a conventional liquid crystal display device has two glass substrates 401 and 402 of a display panel, and a pixel electrode 4°5, 406 and an alignment film 407 are provided on opposing surfaces of the two glass substrates. A liquid crystal composition 409 is sandwiched between these two glass substrates 401 and 402, and spacers 410 are interposed so that the liquid crystal composition 409 faces the pixel electrodes 405 and 406. Stopper/joining member 411
The two glass substrates 401 and 402 are combined in parallel by being sealed together.

And the top and bottom two glass substrates of the display panel 4゜1.40
Connecting members 412 .
A liquid crystal drive circuit 414 is connected via 413.

By the way, for the display panel of conventional liquid crystal display devices, the thickness of the substrate is required to be at least a certain level for strength reasons, so a pair of glass substrates is generally used, so the display panel The thickness of the glass is determined by the thickness of the glass.

On the other hand, in addition to glass substrates, a pair of thin and flexible organic films is also used in small liquid crystal display devices.

Although the thickness of this organic film is about 10 times thinner than that of glass, its rigidity against warping and twisting is low.

In addition, as shown in FIG. 5(a), in the conventional liquid crystal display device, external connection terminals 415 and 416 of two upper and lower glass substrates 401 and 402 are individually connected using anisotropic conductive film connectors. After connecting the liquid crystal drive circuit 414 through the members 412 and 413, turn one substrate over and connect the pixel electrodes 405.4 on both substrates as shown in FIG. 5(b).
Since these two glass substrates 401 and 402 are assembled in a predetermined form with the two glass substrates 401 and 402 facing each other, the two glass substrates 40
The connection structure and process between 1.402 and the liquid crystal drive circuit 414 are complicated.

(Problem to be Solved by the Invention) Currently, various electronic devices that use liquid crystal display devices, such as personal computers and word processors, are required to be thinner, lighter, more functional, and lower in cost. There are also increasing demands for the liquid crystal display devices used to be lighter, thinner, have larger screens, and to simplify the manufacturing process.

However, with the conventional technology, it is difficult to make the device thinner than the current state. On the other hand, if an organic film is used as a substrate, the thickness of the display panel can be made thinner than when using glass, but it has low rigidity, poor flatness, and is prone to warping and twisting. There was a problem in that it was difficult to accommodate larger sizes.

In addition, conventional liquid crystal display devices have many connections, and the board is exposed.
There was a problem in that the manufacturing process was complicated because the connection had to be made by changing the position many times.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a liquid crystal display device having a display element that is lightweight and thin, has a simple structure and manufacturing process, and is compatible with larger sizes. It is in.

[Structure of the invention] (Means for solving the problem) In order to achieve the above-mentioned object, the device of the present invention has the following features:
a rigid substrate on which an electrode is formed, and a second electrode that is connected to a connection wiring provided on the rigid substrate via a connecting member and connected to a drive circuit, and the first electrode and the A liquid crystal display comprising: a flexible film substrate provided to face the rigid substrate so as to face a second electrode; and a liquid crystal composition sealed between the rigid substrate and the film substrate. It is a device.

(Function) In the present invention, by using a thin film substrate on one side and a rigid substrate made of glass or a material having strength similar to glass on the other side, both of the conventional two substrates are thicker than glass. It is thinner and lighter than a display panel made of a material with a flexible material, and has superior rigidity than a conventional display panel made of a thin and flexible material such as an organic film. becomes.

Furthermore, since the connection structure is simplified, the manufacturing process is greatly simplified compared to the conventionally complicated manufacturing process, which has the second advantage of reducing manufacturing costs.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a plan view of a liquid crystal display device according to the present invention, and FIG. 2 is a side sectional view thereof.

The temperature of the upper substrate 1 (i.e. the front side of the display panel) is approximately 150°C.
The lower substrate 2 is a film substrate made of polyethersulfone (PES) with a thickness of about 100 μm and has a heat resistance of about 1 μm, and the lower substrate 2 is a glass substrate of Inon with a thickness of about 1 μm.

Both substrates 1.2 are assembled so as to face each other in parallel, and a pixel electrode 3.4 made of an ITo transparent conductive film, its wiring 5.6, and an alignment film 7 are respectively formed on the opposing surfaces.
．． 8 are pasted to form an XY matrix.

A spacer 11 is interposed between these two substrates to form a liquid crystal composition 1.
Both substrates are sealed with a sealing material/bonding member 12 whose surface is coated with an adhesive so that the XY matrix is sandwiched between the two substrates.

The wiring 6 of the pixel electrode 4 on the lower glass substrate 2 is extended to the outside of the four circumferences of the sealed area, and is connected to the liquid crystal drive circuit from an external connection terminal 13 provided at the end via a heat seal 14. 15.

The wiring 5 of the pixel electrode 3 on the upper film substrate 1 is extended to the outside of the four circumferences of the sealed area, and a connecting terminal 16 is provided at the end thereof. A connecting terminal 18 is provided on the lower glass substrate 2 opposite to this so as to be connected via a connecting member 17 made of a conductive film, and this connecting terminal 18 is used as one end to connect to the liquid crystal drive circuit 15. A connection wiring 20 whose other end is an external connection terminal 19 for connection is arranged on the lower glass substrate 2.

This external connection terminal 19 is connected to the liquid crystal drive circuit 15 via a heat seal 21.

Polarizing plates 22 and 23 are attached to the front and back surfaces of this display panel, thereby configuring the device of the present invention.

When the upper film substrate 1 is adhered to the lower glass substrate 2 via the sealing material/bonding member 12, the connection terminals 16 of the film substrate 1 are connected to the connection terminals 18 of the glass substrate 2 via the connection member 17. Furthermore, the connection terminal 18 of the glass substrate 2 is connected to the heat seal 21 through the connection wiring 20 through the external connection terminal 19, and the heat seal 21 is connected to the liquid crystal drive circuit 15.

Therefore, by bonding the upper film substrate 1 to the lower glass substrate 2 via the connecting member 17, the film substrate 1 and the liquid crystal drive circuit 15 are electrically connected.

In this example, an anisotropic conductive film in which metal particles are dispersed in a thermoplastic resin is used as a connecting member, and after the two substrates are sealed, this anisotropic conductive film is applied between the connection terminals of both substrates. A membrane is inserted and thermocompression bonded at about 15 (]°C).

Thus, according to this embodiment, it is possible to reduce the thickness and weight.
This solves the problem of display panel warping and twisting, and simplifies the structure and manufacturing process.

By the way, in this embodiment, the liquid crystal drive circuit is a circuit on a printed circuit board outside the display panel, but this is pasted on the lower glass substrate 2, using chip-on-glass (COG) or TAB. , even higher density packaging is possible.

This second embodiment is shown in FIG. □ [Effects of the Invention] As explained in detail above, according to the present invention, the device itself can be made thinner and lighter, and can cope with an increase in the screen size of the display panel. 2 is a plan view showing the device of the present invention, FIG. 2 is a side sectional view showing the structure of the device of the present invention, FIG. 3 is a perspective view showing a second embodiment of the device of the present invention, and FIG. 4 is a conventional one. FIGS. 5(a) and 5(b) are side sectional views showing the structure of a liquid crystal display device, and partially omitted perspective views showing the manufacturing process of a conventional liquid crystal display device.

1...Film substrate 2...
......Glass substrate 3...Pixel electrode of film substrate 4...Pixel electrode of glass substrate, 5... ...... Wiring of pixel electrode on film substrate 6 ...... Wiring of pixel electrode on glass substrate 7 ......
Alignment film 8 on film substrate Alignment film 10 on glass substrate Liquid crystal composition 11 ...Spacer 12...
...... Sealing material/bonding member 13.19... External connection terminal 14.21... Heat seal 15... Liquid crystal drive circuit 16.・・・
......Film board connection terminal 17...
......Connecting member 18...
...Glass substrate connection terminal 20...
・Connection wiring 22.23...Polarizing plate applicant Toshiba Corporation agent
Patent Attorney Satoshi Suyama - Figure 1 Figure 2 Figure 4 Figure 3

Claims (1)

[Claims] A rigid substrate on which a first electrode is formed, and a second electrode that is connected to a connection wiring provided on the rigid substrate via a connecting member and connected to a drive circuit. , a film substrate having flexibility provided opposite to the rigid substrate, and sealed between the rigid substrate and the film substrate so that the first electrode and the second electrode face each other. A liquid crystal display device comprising a liquid crystal composition.