JPH0980406A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obviate the development of connection defects, such as disconnection. SOLUTION: This liquid crystal display device is constituted by projecting the right end of a lower film substrate 6 from the right end of an upper film substrate 5 to form a projecting part 6a and arranging and forming plural connecting terminals 11 atop the projecting part 6a. In such a case notched and recessed parts 21 are formed to face each other in both outer parts in the arrangement of the connecting terminals 11 at the projecting part 6a and, therefore, such bending stress as to bend the projecting part 6a downward acts thereon, the parts between the notched and recessed parts 21 of the projecting part 6a are curved by the arc of the width X of the notched and recessed parts 21. The projecting part 6a is thus prevented from bending which is nearly flexing, unlike with the conventional liquid crystal display devices. Then, the connecting terminals 11 formed in the projecting part 6a are also curved by the arc of the width of the notched and recessed parts 21 and the development of the connection defects, such as disconnection, is averted.

Description

Detailed Description of the Invention

[0001]

[0001] The present invention relates to a liquid crystal display device.

[0002]

2. Description of the Related Art FIGS. 4A and 4B show an example of a conventional liquid crystal display device. This liquid crystal display device includes two transparent film substrates 5 and 6 each having transparent electrodes 1 and 2 and alignment films 3 and 4 on opposite surfaces.
Are bonded together via the sealing material 7, and the liquid crystal 8 is sealed between the two film substrates 5 and 6 inside the sealing material 7,
The upper polarizing plate 9 is attached to the upper surface of the upper film substrate 5, and the lower polarizing plate 10 is attached to the lower surface of the lower film substrate 6. Further, in this liquid crystal display device, the right end portion of the lower film substrate 6 is protruded from the facing right end portion of the upper film substrate 5 to form a protruding portion 6a in order to achieve electrical connection with the outside. A plurality of connection terminals 11 made of ITO are arrayed on the upper surface of the portion 6a. A predetermined number of connection terminals 11 are electrically connected to the transparent electrodes 1 of the upper film substrate 5 via a cloth material (not shown), and the remaining plurality of connection terminals 11 are transparent electrodes of the lower film substrate 6. 2 are each directly connected.

[0003]

By the way, in such a conventional liquid crystal display device, an ITO thin film is formed on the upper surface of the lower film substrate 6 by a sputtering method, and the ITO thin film is patterned to form the protrusion 6a. The connection terminal 11 is formed on the upper surface of the. In this case, the temperature condition for forming the ITO film on the film substrate is limited to about 150 ° C. due to the heat resistance of the film substrate, and the temperature condition for forming the ITO film on the glass substrate is 700- It is considerably lower than the temperature of 800 ° C. Therefore, the ITO thin film formed on the upper surface of the film substrate has lower crystallinity and lower strength than the ITO thin film formed on the upper surface of the glass substrate. Therefore, for example, TA
Bending stress acts on the projecting portion 6a when joining the B board or the flexible wiring board to the connection terminal 11 or when handling the liquid crystal display device, and the projecting portion 6a responds to the bending stress as shown in FIG. Connection terminal 11 when bent with a bend close to a bend having a small radius of curvature.
May be cracked, a crack may be generated in an adhesion layer (undercoat layer) (not shown) with the connection terminal 11 of the lower film substrate 6, or the connection terminal 11 may be separated from the lower film substrate 6. As a result, there is a problem that connection failure such as disconnection may occur. An object of the present invention is to prevent connection failure such as disconnection.

[0004]

SUMMARY OF THE INVENTION According to the present invention, two substrates each having a transparent electrode provided on the opposite surfaces thereof are bonded to each other via a sealing material, and at least one of the two substrates is bonded. In a liquid crystal display device in which one end is protruded from the other substrate to form a protrusion, and the connection terminal is arranged in an array on the protrusion, cutout recesses are formed in both outer side portions of the arrangement of the connection terminals in the protrusion. It was formed.

According to the present invention, since the cutout recesses are formed in both outer side portions of the arrangement of the connection terminals in the projections, when the bending stress acts on the projections, the portions of the projections between the cutout recesses have the width of the cutout recesses. The curved portion is curved by the arc of, and the protruding portion does not bend like a bend unlike the conventional liquid crystal display device. Therefore, the connection terminal formed on the protruding portion is also curved by the arc of the width of the cutout recess, and it is possible to prevent connection failure such as disconnection. In this case, as in the second aspect of the present invention, if a hole is formed in a portion of the projecting portion excluding the connection terminal between the two notch concave portions, the portion of the projecting portion between the notch concave portions can more reliably ensure the width of the notch concave portion. It can be curved in an arc, so that connection failure such as disconnection can be prevented.

[0006]

1 (A) and 1 (B) show a liquid crystal display device according to a first embodiment of the present invention. In these figures, the same parts as those in FIGS. 4A and 4B are designated by the same reference numerals, and the description thereof will be appropriately omitted. In this liquid crystal display device, two transparent film substrates 5 and 6 having transparent electrodes 1 and 2 and alignment films 3 and 4 respectively provided on the surfaces facing each other are interposed with a sealing material 7 therebetween, as in the conventional device. The liquid crystal 8 is sealed between the film substrates 5 and 6 inside the sealing material 7, the upper polarizing plate 9 is attached to the upper surface of the upper film substrate 5, and the lower surface is attached to the lower surface of the lower film substrate 6. Although the structure is such that the polarizing plate 10 is attached, the connection terminal 11 in the protruding portion 6a is formed.
Notch recesses (notches) facing both outer sides of the array
21 are formed. In this case, the cutout recess 21 is formed by attaching both polarizing plates 9 and 10 to both film substrates 5 and 6,
It is formed by punching. The width X of the cutout recess 21 corresponds to the width Y of the protrusion 6a. That is, as a specific example, the width Y of the protrusion 6a is 2.5 to 3.0.
In the case of about mm, the width X of the cutout recess 21 is 1.0 to 1.5.
About mm is desirable.

As described above, in this liquid crystal display device, since the notch recesses 21 are formed so as to face each other on both outer side portions of the array of the connection terminals 11 in the protrusion 6a, the protrusion 6a is bent downward. When stress is applied, as shown in FIG. 2, the portion between the cutout recesses 21 of the protrusion 6 a is cutout recess 21.
The curved portion is curved with an arc of width X, and the protruding portion 6a does not bend like a bend unlike the conventional liquid crystal display device shown in FIG.
Therefore, the connection terminal 11 formed on the projecting portion 6a is also curved with the arc of the width X of the cutout concave portion 21, and it is possible to prevent connection failure such as disconnection. Moreover, since the notch recess 21 can be formed by punching,
It is possible to form the notched concave portion 21 at the same time as the outer shape punching process of the film substrates 5 and 6 and the polarizing plates 9 and 10, and it is possible to prevent the number of steps and the manufacturing cost from increasing.

FIG. 3 shows a liquid crystal display device according to a second embodiment of the present invention. In this figure, FIG.
The same parts as those in (A) are designated by the same reference numerals, and the description thereof will be omitted as appropriate. In this liquid crystal display device, two holes 22 are provided at a predetermined interval between both cutout recesses 21 in the protrusion 6a.
Are formed. In this case, each hole 22 has both polarizing plates 9,
It is formed by punching after attaching 10 to both film substrates 5 and 6. The width Z of each hole 22 is equal to the width X of the cutout recess 21. In addition, hole 2
The connection terminals 11 are arranged between the holes 2 and the holes 22 and between the holes 22 and the cutout recesses 21. The shape of the hole 22 is not limited to the rectangular shape shown in FIG. 3, and may be an ellipse, a circle, or the like.

As described above, in this liquid crystal display device, the connection terminal 11 between the notched recesses 21 in the protrusion 6a is formed.
Since the hole 22 is formed in the portion where the cutout is not formed, the portion of the protruding portion 6a between the cutout recesses 21 and 21 can be more surely curved with the arc of the width X of the cutout recess 21 to further prevent disconnection. It is possible to prevent connection failure. Since the holes 22 can also be formed by punching, the film substrates 5 and 6 and the polarizing plates 9 and 1 can be formed.
It can be formed at the same time as the outer shape punching process of 0, and the number of steps and the manufacturing cost can be prevented from increasing. Further, each hole 22 can be used as a positioning hole in the assembly process, a shaft hole of a needle when used in a timepiece, a screw hole at the time of mounting, and the like.

In the above first and second embodiments,
Although one end of the lower film substrate 6 is made to project from one end of the upper film substrate 5 which is opposed to each other to form the protruding portion 6a, and the notch recess 21 is formed in the protruding portion 6a, the present invention is not limited to this. You may project one end part of the film substrates 5 and 6 from the one end part of the film substrate 5 and 6 which opposes, and form the protrusion part 6a, and you may respectively form a notch recessed part in these protrusion parts 6a.

[0011]

As described above, according to the present invention, since the notch recesses are formed at both outer side portions of the array of the connection terminals in the protrusion, when the bending stress acts on the protrusion,
The portion of the protruding portion between the notch concave portions is curved with an arc having the width of the notch concave portion, and the protruding portion does not bend like a bend unlike the conventional liquid crystal display device. Therefore, the connection terminal formed on the protruding portion is also curved by the arc of the width of the cutout recess, and it is possible to prevent connection failure such as disconnection. In this case, as in the invention according to claim 2, since the hole is formed in the portion of the protrusion except the connection terminal between the notch recesses, the portion of the protrusion between the notch recesses has a more reliable width of the notch recess. It can be curved in an arc, so that connection failure such as disconnection can be prevented.

[Brief description of drawings]

FIG. 1A is a plan view showing a liquid crystal display device according to a first embodiment of the present invention, and FIG. 1B is a sectional view taken along line BB thereof.

FIG. 2 is a cross-sectional view showing a state in which bending stress acts on a protrusion of the liquid crystal display device.

FIG. 3 is a plan view showing a liquid crystal display device according to a second embodiment of the present invention.

FIG. 4A is a plan view showing a conventional liquid crystal display device,
(B) is sectional drawing which follows the BB line.

FIG. 5 is a cross-sectional view showing a state in which bending stress acts on a protrusion of the liquid crystal display device.

[Explanation of symbols]

 5 Upper Film Substrate 6 Lower Film Substrate 6a Projection 11 Connection Terminal 21 Notch Recess

Claims (3)

[Claims] 1. Two substrates, each of which has transparent electrodes provided on opposite surfaces thereof, are bonded to each other via a sealing material, and one end of at least one of the two substrates projects from the other substrate. In the liquid crystal display device in which the protruding portions are formed, and the connection terminals are formed in an array on the protruding portions, cutout recesses are formed in both outer side portions of the arrangement of the connection terminals in the protruding portions. Display device. 2. The liquid crystal display device according to claim 1, wherein a hole is formed in a portion of the protrusion where the connection terminal is not formed between the notch recesses. 3. The liquid crystal display device according to claim 1, wherein the substrate is made of a resin film.