JPH11288003A - Liquid crystal substrate, liquid crystal display device using the same and method for forming liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid crystal substrate having such a structure that it is not necessary to connect the liquid crystal substrate and a bus circuit board and the area of the outer edge of a liquid crystal panel is reduced as much as possible, to provide a liquid crystal display device for preventing a connection defect owing pitch shift and the peeling-off of a junction part and to provide its forming method. SOLUTION: The liquid crystal substrate 2 is formed of a hard base material which does not have flexibility. A liquid crystal driving circuit where multiple layers are printed in an insulating film having a flexibility is installed on the same substrate of the liquid crystal substrate 2. At least one notch is formed on a face opposite to a face where the liquid crystal driving circuit is formed, and the substrate can be bent to a direction where the face of the liquid crystal driving circuit exists by 90 degrees or 180 degrees. The liquid crystal display device is formed of the liquid crystal substrate 2, a liquid crystal display element 1 and a driving LSI loading part 4. The driving LSI loading part 4 is formed by bending the liquid crystal board 2 by 90 degrees or 180 degrees and cutting it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display circuit board, a liquid crystal drive circuit, and a liquid crystal display device using the same.

[0002]

2. Description of the Related Art A liquid crystal display device generally has a liquid crystal panel in which a liquid crystal material is sandwiched between two opposing substrates, and a circuit for driving the liquid crystal panel. For example, in an active-type liquid crystal display device, the circuit unit receives a signal from an electrode wiring around the liquid crystal panel, and mounts a driving LSI (TCP) for driving a TFT (thin film transistor) built in the liquid crystal panel. tape car
and a bus circuit board for supplying a power supply voltage, a ground voltage, a video signal, and the like to the TCP.

FIG. 9 is a cross-sectional explanatory view showing a circuit portion of a conventional liquid product display device. In FIG.
102 is a liquid crystal substrate, 103 is a color filter substrate, 10
4 is a driving LSI, 105 is a TCP on which the driving LSI 104 is mounted, 106 is a bus circuit board, 107 is a liquid crystal substrate 10
Reference numeral 2 denotes a lighting device provided on the back surface, 109 denotes an anisotropic conductive film, and 110 denotes a connection member.

[0004] TCP 105 mounted with driving LSI 104
Are connected to the wiring terminals provided on the liquid crystal substrate 102 by an anisotropic conductive film 109, and the input terminals of the TCP 105 are connected to the bus circuit board 106 by connecting members 110.

As described above, the TCP 105 and the bus circuit board 106 connected to the liquid crystal substrate 102 by the anisotropic conductive film 109 are disposed horizontally on the surface of the liquid crystal substrate 102.
Further, an illumination device 107 is provided on the back surface of the liquid crystal substrate 102.

[0006] FIG.
FIG. 11 is a cross-sectional explanatory view of a conventional liquid crystal display device showing a structure in which the illumination device 107 is bent so as to be wound and the driving LSI 104 and the bus circuit board 106 are disposed on the back surface of the illumination device 107 by utilizing the flexibility of the CP 105. .

[0007] FIG.
Utilizing the flexibility of CP105 to bend and drive LSI
FIG. 4 is a cross-sectional explanatory view of a conventional liquid crystal display device showing a structure in which a bus circuit board 104 and a bus circuit board 106 are disposed on a side surface of a lighting device 107.

[0008]

As described above,
In the conventional liquid crystal display device, the liquid crystal substrate and the bus circuit substrate are independent, and the two substrates have to be connected by a flexible anisotropic conductive film or the like, which requires a cost accompanying an increase in the number of manufacturing steps. There was a disadvantage. In addition, there is a problem in that a connection with a narrow line width causes an operation failure of a liquid crystal pixel due to a connection failure due to a pitch shift.

Further, the presence of the connection portion with the bus circuit board causes a problem that the area of the frame portion of the liquid crystal panel cannot be further reduced.

The present invention solves the above-mentioned problems, and eliminates the need to connect the liquid crystal substrate and the bus circuit board, and has a structure in which the area of the outer edge of the liquid crystal panel is made as small as possible. It is another object of the present invention to provide a substrate and a liquid crystal display device capable of preventing connection failure due to a pitch shift and peeling of a joint portion, and a method for forming the same.

[0011]

In order to achieve the above object, a liquid crystal display device according to claim 1 is a liquid crystal substrate made of a rigid base material having no flexibility, and the same liquid crystal substrate as the liquid crystal substrate. A liquid crystal driving circuit formed by multi-layer printing on a flexible insulating film is provided over a substrate, and at least one notch is provided on a surface opposite to a surface on which the liquid crystal driving circuit is formed. The liquid crystal substrate can be bent by 90 degrees in a direction in which a liquid crystal drive circuit surface exists.

According to a second aspect of the present invention, the liquid crystal substrate is made of glass, and the insulating film is made of polyimide.

In the liquid crystal substrate according to the third aspect, the notch is formed by diamond cutting.

According to a fourth aspect of the present invention, there is provided a liquid crystal display device comprising at least a liquid crystal substrate according to the first aspect, a liquid crystal display element, and a driving LSI mounting section on which a liquid crystal driving LSI for driving the liquid crystal display element is mounted. The drive LSI mounting portion is formed by providing a drive LSI at an end of the liquid crystal drive circuit and then bending the liquid crystal substrate by 90 degrees.

According to a fifth aspect of the present invention, there is provided a liquid crystal display device comprising at least a liquid crystal substrate according to the first aspect, a liquid crystal display element, and a drive LSI mounting portion on which a liquid crystal drive LSI for driving the liquid crystal display element is mounted. The drive LSI mounting portion is formed by bending the liquid crystal substrate by 90 degrees after the drive LSI is provided at an end of the liquid crystal drive circuit, and fixing the cross section of the bent liquid crystal substrate with an adhesive resin. Is what is being done.

A liquid crystal substrate according to a sixth aspect of the present invention is a liquid crystal substrate made of a rigid non-flexible base material, and a multi-layer printing of a flexible insulating film on the same substrate as the liquid crystal substrate. A liquid crystal driving circuit is provided, and at least one notch is provided on a surface opposite to the surface on which the liquid crystal driving circuit is formed, and the liquid crystal substrate is oriented in a direction in which the liquid crystal driving circuit surface exists. It can be bent by 180 degrees.

According to a seventh aspect of the present invention, there is provided a liquid crystal display device comprising at least a liquid crystal substrate according to the sixth aspect, a liquid crystal display element, and a drive LSI mounting section on which a liquid crystal drive LSI for driving the liquid crystal display element is mounted. The driving LSI mounting portion is formed by providing the driving LSI at an end of the liquid crystal driving circuit, then bending the liquid crystal substrate by 180 degrees, and removing the liquid crystal substrate in the driving LSI mounting portion. Is what it is.

A liquid crystal display device according to claim 8 comprises at least a liquid crystal substrate according to claim 6, a liquid crystal display element, and a drive LSI mounting portion on which a liquid crystal drive LSI for driving the liquid crystal display element is mounted. In the driving LSI mounting portion, after the driving LSI is provided at the end of the liquid crystal driving circuit, the liquid crystal substrate is bent by 180 degrees, the liquid crystal substrate in the driving LSI mounting portion is removed, and the liquid crystal substrate is removed. The end of the insulating film in the portion indicated by the arrow and the side surface of the liquid crystal display element are fixed with an adhesive resin.

According to a ninth aspect of the present invention, there is provided a liquid crystal display device comprising at least a liquid crystal substrate according to the sixth aspect, a liquid crystal display element, and a drive LSI mounting portion on which a liquid crystal drive LSI for driving the liquid crystal display element is mounted. In the driving LSI mounting portion, after a driving LSI is provided at an end of the liquid crystal driving circuit, the liquid crystal substrate is bent by 180 degrees, and an adhesive resin is injected into an inner portion formed by bending the insulating film by 180 degrees. Is fixed.

A liquid crystal substrate according to a tenth aspect is a liquid crystal substrate made of a rigid base material having no flexibility, and is formed by multi-layer printing on a flexible insulating film on the same substrate as the liquid crystal substrate. A liquid crystal driving circuit is provided, and at least two liquid crystal driving circuits are formed on a surface opposite to the surface on which the liquid crystal driving circuit is formed.
The notch is provided, the liquid crystal substrate is bent at both of the two notches, and a portion of the liquid crystal substrate sandwiched between the two notches can be removed.

A liquid crystal display device according to claim 11 comprises at least a liquid crystal substrate according to claim 10, a liquid crystal display element, and a drive LSI mounting portion on which a liquid crystal drive LSI for driving the liquid crystal display element is mounted. The drive LSI mounting portion is formed by providing a drive LSI at an end of the liquid crystal drive circuit and then bending the liquid crystal substrate by 90 degrees at the two cutouts.

According to a twelfth aspect of the present invention, there is provided a liquid crystal display device comprising at least a liquid crystal substrate according to the first aspect, a liquid crystal display element,
A driving LSI mounting section on which a liquid crystal driving LSI for driving the liquid crystal display element is mounted.
After a driving LSI is provided at an end of the liquid crystal driving circuit, the liquid crystal substrate is bent by 90 degrees, a portion of the liquid crystal substrate on which the driving LSI mounting portion is formed is removed, and a portion of the portion where the liquid crystal substrate is removed is removed. An end of the insulating film is fixed with an adhesive resin.

According to a thirteenth aspect of the present invention, there is provided a method for forming a liquid crystal display device comprising at least a liquid crystal substrate according to the first aspect, a liquid crystal display element, and a liquid crystal driving LSI for driving the liquid crystal display element. A method for forming a liquid crystal display device in which the liquid crystal display element is connected to the liquid crystal driving LSI, wherein after a driving LSI is provided at an end of the liquid crystal driving circuit, the liquid crystal substrate is provided with the liquid crystal driving circuit surface. This is a forming method in which the drive LSI mounting portion is formed by bending the driving LSI at 90 degrees in the direction.

According to a fourteenth aspect of the present invention, there is provided a method of forming a liquid crystal display device comprising at least a liquid crystal substrate according to the sixth aspect, a liquid crystal display element, and a liquid crystal driving LSI for driving the liquid crystal display element. A method for forming a liquid crystal display device in which the liquid crystal display element is connected to the liquid crystal driving LSI, wherein after a driving LSI is provided at an end of the liquid crystal driving circuit, the liquid crystal substrate is provided with the liquid crystal driving circuit surface. This is a forming method in which the drive LSI mounting portion is formed by being bent 180 degrees in the direction.

FIG. 8 is a conceptual explanatory view showing the operation of the liquid crystal display device of the present invention. In the figure, (a), (b),
The bending of the liquid crystal substrate proceeds in the order of (c), and B1
And B2 indicate the bending direction, and C1 and C2
Reference numeral 2 indicates the direction in which the crack progresses.

According to the first aspect of the present invention, the liquid crystal driving circuit is formed on the same substrate as the liquid crystal substrate, and the liquid crystal driving circuit uses a flexible insulating film. The structure is connected to the display element.
For this reason, as shown in FIG. 8, if a notch is provided on the surface of the liquid crystal substrate opposite to the surface on which the liquid crystal drive circuit is formed, and the liquid crystal substrate itself is bent and cut, the liquid crystal substrate is broken and broken. Since the connection circuit is a flexible material, the destruction does not proceed any further, and the crack proceeds along the interface between the liquid crystal substrate and the connection circuit. As a result, a structure is created in which independent bus circuit boards are connected by flexible connection circuits.

[0027]

Embodiments of the present invention will be described below in more detail with reference to the accompanying drawings.

Embodiment 1 FIG. 1 is an explanatory sectional view showing the structure of a liquid crystal display according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a liquid crystal display element (hereinafter, referred to as a liquid crystal display element).
2 is a liquid crystal substrate, 3 is a color filter substrate, 4 is a liquid crystal driving LSI (hereinafter simply referred to as a driving LSI).
5) is a flexible insulating film, 6 is a connection circuit pattern wiring (hereinafter simply referred to as a connection circuit), 7 is an illuminating device provided on the back surface of the liquid crystal substrate 2, and 9 is a driving circuit pattern wiring (of the driving LSI 4). 12 is a drive LSI connection terminal, and 13 is a liquid crystal. The connection circuit pattern wiring (connection circuit) 6 and the drive circuit pattern wiring 9 are collectively referred to as a liquid crystal drive circuit. A portion of the drive circuit pattern wiring 9 on which the drive LSI is mounted is referred to as a drive LSI mounting portion. The liquid crystal substrate 2 is made of a hard base material having no flexibility, and an example of a material to be used is glass. The display element 1 is formed on the liquid crystal substrate 2. As an example of a material used for the flexible insulating film 5, which is a flexible insulating film, polyimide can be given. In addition, the connection circuit 6 is formed by printing a conductive metal film on a flexible insulating film in multiple layers, and the material of the metal film is, for example, copper. In addition, the display element 1 is a TFT, the color filter substrate 3 is glass, the drive LSI 4 is a display driver, and the illumination device 7 is a fluorescent display lamp, and the same as the conventional one can be used. According to the present invention, the liquid crystal substrate is formed of a rigid substrate having no flexibility, a liquid crystal driving circuit is provided on the liquid crystal substrate, and at least a surface opposite to the surface on which the liquid crystal driving circuit is formed is provided. One notch is provided, and can be bent 90 degrees in the direction in which the liquid crystal drive circuit exists. The position where the notch is provided is on the back surface of the liquid crystal substrate, and the notch is provided by a method called diamond cutter processing. By using the liquid crystal substrate of the present invention, the liquid crystal substrate can be moved 90 degrees in the direction in which the liquid crystal driving circuit exists.
The liquid crystal display device can be manufactured by bending the drive LSI mounting portion and by combining the same with a conventional liquid crystal display element.

According to the present embodiment, the liquid crystal drive circuit is formed on the same substrate as the liquid crystal substrate, and then is bent and cut. Since the connection circuit formed by printing is connected to the liquid crystal display element, a bus circuit board made of a different material is separately prepared as in the conventional embodiment, and the connection is performed with high-precision pitch adjustment. Eliminates the need. For this reason, it is possible to prevent a connection failure due to a pitch shift and a peeling of a joint portion, which have conventionally been problems.

Further, since the area of the frame after being bent can be made extremely small because the circuit connection portion which has been conventionally required can be eliminated, the area of the liquid crystal display portion becomes extremely large with respect to the entire size of the display device. Can be taken.

Embodiment 2 FIG. 2 is an explanatory sectional view showing a structure of a liquid crystal display device according to Embodiment 2 of the present invention. In the figure, reference numeral 8 denotes an adhesive resin, and the same elements as those shown in FIG. 1 are denoted by the same reference numerals (the same applies to FIG. 3 and subsequent figures). As shown in FIG. 2, the cross section of the liquid crystal substrate of the liquid crystal display device in which the liquid crystal substrate is bent may be fixed with an adhesive resin 8 in order to protect the bent flexible connection circuit. The other points are the same as the first embodiment, and only the points different from the first embodiment in the following third to seventh embodiments will be described.

Third Embodiment FIG. 3 is an explanatory sectional view showing a structure of a liquid crystal display according to a third embodiment of the present invention. FIG. 1 shows a case where the liquid crystal substrate is bent at 90 degrees. As shown in FIG. 3, the liquid crystal substrate is bent at 180 degrees and a liquid crystal display is formed by a connection circuit formed by multilayer printing on a flexible insulating film. It is also possible to adopt a structure in which the driving LSI is sandwiched between the liquid crystal substrates, with a structure connected to the element. According to the present invention, the liquid crystal substrate is formed of a rigid substrate having no flexibility, a liquid crystal driving circuit is provided on the liquid crystal substrate, and at least a surface opposite to the surface on which the liquid crystal driving circuit is formed is provided. One notch is provided and can be bent 180 degrees in the direction in which the liquid crystal drive circuit exists. The position where the notch is provided is on the back surface of the liquid crystal substrate, and the notch is provided by a method called diamond cutter processing. By using the liquid crystal substrate of the present invention, a liquid crystal display device can be manufactured by forming a driving LSI mounting portion by bending the liquid crystal substrate 180 degrees in a direction in which a liquid crystal driving circuit exists.

Fourth Embodiment FIG. 4 is an explanatory sectional view showing a structure of a liquid crystal display according to a fourth embodiment of the present invention. In addition, when the liquid crystal substrate is bent by 180 degrees, as shown in FIG. 4, the liquid crystal substrate on which the drive LSI is mounted is removed, and only the flexible connection circuit is left. May be configured to fix the end portion with an adhesive resin.

Embodiment 5 FIG. 5 is an explanatory sectional view showing the structure of a liquid crystal display according to Embodiment 5 of the present invention. Further, in the case where the liquid crystal substrate is bent by 180 degrees so that the driving LSI is sandwiched between the liquid crystal substrates, a gap between the original liquid crystal substrate and the liquid crystal substrate on which the driving LSI is mounted is formed as shown in FIG. It is also possible to adopt a structure in which an adhesive resin is injected and fixed.

Sixth Embodiment FIG. 6 is an explanatory sectional view showing a structure of a liquid crystal display according to a sixth embodiment of the present invention. Further, in the example shown above, the structure is shown in which the structure is bent toward the drive LSI mounting surface.
As shown in FIG. 6, first, two notches are formed in the liquid crystal substrate and the substrate is cut off. Then, a portion of the liquid crystal substrate sandwiched between the two notches is removed, and a gap where the liquid crystal substrate is removed is removed. By utilizing this, a structure in which the liquid crystal substrate is bent 90 degrees to the side opposite to the driving LSI mounting surface can be used. According to the present invention, the liquid crystal substrate is formed of a rigid substrate having no flexibility, a liquid crystal driving circuit is provided on the liquid crystal substrate, and at least a surface opposite to the surface on which the liquid crystal driving circuit is formed is provided. Two notches are provided and can be bent 90 degrees in the direction in which the liquid crystal drive circuit exists. The position where the notch is provided is on the back surface of the liquid crystal substrate, and the notch is provided by a method called diamond cutter processing. By using the liquid crystal substrate of the present invention, a liquid crystal display device can be manufactured by bending a liquid crystal substrate by 90 degrees in a direction in which a liquid crystal driving circuit exists and forming a driving LSI mounting portion.

Seventh Embodiment FIG. 7 is an explanatory sectional view showing a structure of a liquid crystal display according to a seventh embodiment of the present invention. Even if one notch is provided first, as shown in FIG.
After removing the substrate portion of the SI mounting portion, the flexible connection circuit is left alone, and 9
It is also possible to adopt a structure in which it is bent at 0 degrees and its end is fixed with an adhesive resin.

[0038]

The liquid crystal display device according to the first aspect is a liquid crystal substrate made of a hard base material having no flexibility.
A liquid crystal driving circuit formed by multi-layer printing on a flexible insulating film is provided on the same substrate as the liquid crystal substrate, and at least one liquid crystal driving circuit is provided on a surface opposite to the surface on which the liquid crystal driving circuit is formed. The notch is provided, and the liquid crystal substrate can be bent by 90 degrees in the direction where the liquid crystal drive circuit surface exists. Therefore, a bus circuit substrate is separately prepared as in the conventional embodiment, and the pitch is precisely adjusted. There is no need to connect them together. Thus, the number of steps can be reduced, and connection failure and peeling of the joint can be prevented. Further, the frame area of the liquid crystal substrate can be extremely reduced.

In the liquid crystal substrate according to the second aspect, since the liquid crystal substrate is made of glass and the insulating film is made of polyimide, the number of steps can be reduced by using a conventional material.
Poor connection and peeling of the joint can be prevented. Further, the frame area of the liquid crystal substrate can be extremely reduced.

In the liquid crystal substrate according to the third aspect, since the notch is formed by diamond cutting, the number of steps can be reduced by using a conventional material, and a connection failure and peeling of a joint can be prevented. Further, the frame area of the liquid crystal substrate can be extremely reduced.

According to a fourth aspect of the present invention, there is provided a liquid crystal display device comprising at least a liquid crystal substrate according to the first aspect, a liquid crystal display element, and a driving LSI mounting section on which a liquid crystal driving LSI for driving the liquid crystal display element is mounted. The driving LSI mounting portion is formed by bending the liquid crystal substrate by 90 degrees after the driving LSI is provided at an end of the liquid crystal driving circuit, so that the bus circuit substrate is separately provided as in the conventional embodiment. There is no need to prepare and connect with high precision pitch adjustment. Thus, the number of steps can be reduced, and connection failure and peeling of the joint can be prevented. Further, the frame area of the liquid crystal substrate can be extremely reduced.

According to a fifth aspect of the present invention, there is provided a liquid crystal display device comprising at least a liquid crystal substrate according to the first aspect, a liquid crystal display element, and a driving LSI mounting section on which a liquid crystal driving LSI for driving the liquid crystal display element is mounted. The drive LSI mounting portion is formed by bending the liquid crystal substrate by 90 degrees after the drive LSI is provided at an end of the liquid crystal drive circuit, and fixing the cross section of the bent liquid crystal substrate with an adhesive resin. Therefore, the bent flexible connection circuit can be protected by fixing the cross section of the bent liquid crystal substrate with an adhesive resin.

The liquid crystal substrate according to the sixth aspect is a liquid crystal substrate made of a rigid base material having no flexibility, and is formed by multi-layer printing on a flexible insulating film on the same substrate as the liquid crystal substrate. A liquid crystal driving circuit is provided, and at least one notch is provided on a surface opposite to the surface on which the liquid crystal driving circuit is formed, and the liquid crystal substrate is oriented in a direction in which the liquid crystal driving circuit surface exists. Since it can be bent by 180 degrees, in addition to the effect described in claim 1, the frame area can be further reduced by folding the liquid crystal drive circuit.

According to a seventh aspect of the present invention, there is provided a liquid crystal display device comprising at least a liquid crystal substrate according to the fourth aspect, a liquid crystal display element, and a drive LSI mounting portion on which a liquid crystal drive LSI for driving the liquid crystal display element is mounted. The driving LSI mounting portion is formed by providing the driving LSI at an end of the liquid crystal driving circuit, then bending the liquid crystal substrate by 180 degrees, and removing the liquid crystal substrate in the driving LSI mounting portion. Therefore, in addition to the effect described in claim 1, the frame area can be further reduced by folding the liquid crystal drive circuit.

A liquid crystal display device according to claim 8 comprises at least a liquid crystal substrate according to claim 6, a liquid crystal display element, and a drive LSI mounting portion on which a liquid crystal drive LSI for driving the liquid crystal display element is mounted. In the driving LSI mounting portion, after the driving LSI is provided at the end of the liquid crystal driving circuit, the liquid crystal substrate is bent by 180 degrees, the liquid crystal substrate in the driving LSI mounting portion is removed, and the liquid crystal substrate is removed. Since the edge of the insulating film and the side surface of the liquid crystal display element at the portion where the liquid crystal display element has been fixed are fixed with the adhesive resin, it is possible to save space in the frame portion by removing the liquid crystal substrate.

According to a ninth aspect of the present invention, there is provided a liquid crystal display device comprising at least a liquid crystal substrate according to the sixth aspect, a liquid crystal display element, and a driving LSI mounting section on which a liquid crystal driving LSI for driving the liquid crystal display element is mounted. In the driving LSI mounting portion, after a driving LSI is provided at an end of the liquid crystal driving circuit, the liquid crystal substrate is bent by 180 degrees, and an adhesive resin is injected into an inner portion formed by bending the insulating film by 180 degrees. Therefore, by fixing the cross section where the liquid crystal substrate is bent with an adhesive resin, the drive LSI and the bent flexible connection circuit can be protected.

According to a tenth aspect of the present invention, the liquid crystal substrate is a liquid crystal substrate made of a rigid base material having no flexibility, and is formed by multi-layer printing on a flexible insulating film on the same substrate as the liquid crystal substrate. A liquid crystal driving circuit is provided, and at least two liquid crystal driving circuits are formed on a surface opposite to the surface on which the liquid crystal driving circuit is formed.
Since the notch is provided, the liquid crystal substrate is bent at both of the two notches, and the portion of the liquid crystal substrate sandwiched between the two notches can be removed. When the mounting thickness is not uniform or when mounting a thick drive LSI, the mounting can be performed with the frame area as small as possible.

[0048] A liquid crystal display device according to claim 11 comprises at least a liquid crystal substrate according to claim 10, a liquid crystal display element, and a drive LSI mounting portion on which a liquid crystal drive LSI for driving the liquid crystal display element is mounted. Since the drive LSI mounting portion is formed by providing the drive LSI at the end of the liquid crystal drive circuit and then bending the liquid crystal substrate by 90 degrees with the two cutouts, the mounting thickness of the drive LSI is not uniform. In other words, when mounting a thick drive LSI, the mounting can be performed with the frame area as small as possible.

According to a twelfth aspect of the present invention, there is provided a liquid crystal display device comprising at least a liquid crystal substrate according to the first aspect, a liquid crystal display element,
A driving LSI mounting section on which a liquid crystal driving LSI for driving the liquid crystal display element is mounted.
After a driving LSI is provided at an end of the liquid crystal driving circuit, the liquid crystal substrate is bent by 90 degrees, a portion of the liquid crystal substrate on which the driving LSI mounting portion is formed is removed, and a portion of the portion where the liquid crystal substrate is removed is removed. Since the end portion of the insulating film is fixed with an adhesive resin, when the mounting thickness of the driving LSI is not uniform, or when the thick driving LSI is mounted,
The mounting can be performed while the frame area is made as small as possible, and the space of the frame can be saved by the amount of the liquid crystal substrate removed.

According to a thirteenth aspect of the present invention, a method for forming a liquid crystal display device comprises at least a liquid crystal substrate according to the first aspect, a liquid crystal display element, and a liquid crystal drive LSI for driving the liquid crystal display element. A method for forming a liquid crystal display device in which the liquid crystal display element is connected to the liquid crystal driving LSI, wherein after a driving LSI is provided at an end of the liquid crystal driving circuit, the liquid crystal substrate is provided with the liquid crystal driving circuit surface. This is a forming method in which the drive LSI mounting portion is formed by bending and cutting at 90 degrees in the direction, so that the number of steps can be reduced and connection failure and peeling of the joint portion can be prevented. Further, the frame area of the liquid crystal substrate can be extremely reduced.

According to a fourteenth aspect of the present invention, there is provided a method for forming a liquid crystal display device comprising at least a liquid crystal substrate according to the sixth aspect, a liquid crystal display element, and a liquid crystal driving LSI for driving the liquid crystal display element. A method for forming a liquid crystal display device in which the liquid crystal display element is connected to the liquid crystal driving LSI, wherein after a driving LSI is provided at an end of the liquid crystal driving circuit, the liquid crystal substrate is provided with the liquid crystal driving circuit surface. Since the driving LSI mounting portion is formed by bending the driving LSI mounting portion 180 degrees in the direction, the number of steps can be reduced, and a connection failure and peeling of a bonding portion can be prevented. Further, the frame area of the liquid crystal substrate can be extremely reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is an explanatory sectional view of a liquid crystal display device according to Embodiment 2 of the present invention.

FIG. 3 is an explanatory sectional view of a liquid crystal display device according to Embodiment 3 of the present invention.

FIG. 4 is an explanatory sectional view of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory sectional view of a liquid crystal display device according to Embodiment 5 of the present invention.

FIG. 6 is an explanatory sectional view of a liquid crystal display device according to Embodiment 6 of the present invention.

FIG. 7 is an explanatory sectional view of a liquid crystal display device according to a seventh embodiment of the present invention.

FIG. 8 is a conceptual explanatory diagram illustrating the operation of the present invention.

FIG. 9 is an explanatory sectional view showing a conventional liquid crystal display device.

FIG. 10 is an explanatory sectional view showing a conventional liquid crystal display device.

FIG. 11 is an explanatory sectional view showing a conventional liquid crystal display device.

[Explanation of symbols]

Reference Signs List 1 display element, 2 liquid crystal substrate, 3 color filter substrate, 4 drive LSI, 5 flexible insulating film, 6 connection circuit, 7 lighting device, 8 adhesive resin.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hayato Takasago 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Kohei Adachi 997 Miyoshi, Nishigoshi-cho, Kikuchi-gun, Kumamoto Co., Ltd. Inside Advanced Display (72) Inventor Tohru Koshikawa 997 Miyoshi, Nishigoshi-cho, Kikuchi-gun, Kumamoto Prefecture Inside Advanced Display Co., Ltd. (72) Teruhito Matsui 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Atsushi Tanaka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (14)

[Claims] 1. A liquid crystal substrate comprising a rigid base material having no flexibility, and a liquid crystal drive circuit formed by multi-layer printing on a flexible insulating film is provided on the same substrate as the liquid crystal substrate. And at least one notch is provided on the surface opposite to the surface on which the liquid crystal drive circuit is formed, and the liquid crystal substrate is bendable by 90 degrees in the direction in which the liquid crystal drive circuit surface exists. Liquid crystal substrate. 2. The liquid crystal substrate according to claim 1, wherein said liquid crystal substrate is made of glass, and said insulating film is made of polyimide. 3. The liquid crystal substrate according to claim 1, wherein the notch is formed by diamond cutter processing. 4. A liquid crystal substrate according to claim 1,
A liquid crystal display element and a liquid crystal drive L for driving the liquid crystal display element
A liquid crystal display device comprising: a driving LSI mounting portion on which an SI is mounted; wherein the driving LSI mounting portion includes a driving LSI provided at an end of the liquid crystal driving circuit, and then the liquid crystal substrate is bent by 90 degrees. 5. A liquid crystal substrate according to claim 1,
A liquid crystal display element and a liquid crystal drive L for driving the liquid crystal display element
A driving LSI mounting portion on which the SI is mounted, and the driving LSI mounting portion is formed by forming the liquid crystal substrate by 90 degrees after the driving LSI is provided at an end of the liquid crystal driving circuit, and the liquid crystal substrate is bent by 90 degrees. A liquid crystal display device in which the generated cross section of the liquid crystal substrate is fixed with an adhesive resin. 6. A liquid crystal substrate made of a rigid base material having no flexibility, and a liquid crystal drive circuit formed by multi-layer printing on a flexible insulating film is provided on the same substrate on the liquid crystal substrate. And at least one notch is provided on a surface opposite to the surface on which the liquid crystal drive circuit is formed, and the liquid crystal substrate is bendable by 180 degrees in a direction in which the liquid crystal drive circuit surface exists. Liquid crystal substrate. 7. A liquid crystal substrate according to claim 6,
A liquid crystal display element and a liquid crystal drive L for driving the liquid crystal display element
A driving LSI mounting portion on which the SI is mounted, and the driving LSI mounting portion has the liquid crystal substrate bent at 180 degrees after the driving LSI is provided at an end of the liquid crystal driving circuit;
A liquid crystal display device formed by removing the liquid crystal substrate in the drive LSI mounting portion. 8. A liquid crystal substrate according to claim 6, wherein:
A liquid crystal display element and a liquid crystal drive L for driving the liquid crystal display element
A driving LSI mounting portion on which the SI is mounted, and the driving LSI mounting portion has the liquid crystal substrate bent at 180 degrees after the driving LSI is provided at an end of the liquid crystal driving circuit;
A liquid crystal display device in which the liquid crystal substrate in a portion of the drive LSI mounting portion is removed, and an end of the insulating film in a portion where the liquid crystal substrate is removed and a side surface of the liquid crystal display element are fixed with an adhesive resin; . 9. A liquid crystal substrate according to at least claim 6,
A liquid crystal display element and a liquid crystal drive L for driving the liquid crystal display element
And a drive LSI mounting portion on which the SI is mounted. After the drive LSI is provided at an end of the liquid crystal drive circuit, the liquid crystal substrate is bent by 180 degrees, and the insulating film is bent by 180 degrees. A liquid crystal display device in which an adhesive resin is injected into an inner part generated and fixed. 10. A liquid crystal substrate formed of a rigid base material having no flexibility, and a liquid crystal driving circuit formed by multi-layer printing on a flexible insulating film is provided on the same substrate as the liquid crystal substrate. And at least two notches are provided on a surface opposite to the surface on which the liquid crystal driving circuit is formed, and the liquid crystal substrate is bent at both of the two notches,
A liquid crystal substrate in which a portion of the liquid crystal substrate sandwiched between the two cutouts is made removable. 11. A liquid crystal substrate according to claim 10, a liquid crystal display element, and a driving LSI mounting section on which a liquid crystal driving LSI for driving the liquid crystal display element is mounted, wherein the driving LSI mounting section includes the liquid crystal. Drive LSI at the end of the drive circuit
Is provided, and the liquid crystal substrate is formed by bending the liquid crystal substrate 90 degrees at the two cutouts. 12. A liquid crystal substrate comprising at least the liquid crystal substrate according to claim 1, a liquid crystal display element, and a driving LSI mounting section on which a liquid crystal driving LSI for driving the liquid crystal display element is mounted. Drive LS at the end of the liquid crystal drive circuit
After the I is provided, the liquid crystal substrate is bent by 90 degrees, the liquid crystal substrate in the portion where the drive LSI mounting portion is formed is removed, and the end of the insulating film in the portion where the liquid crystal substrate is removed is bonded. Liquid crystal display device fixed with resin for use. 13. A liquid crystal display device comprising at least a liquid crystal substrate according to claim 1, a liquid crystal display element, and a liquid crystal drive LSI for driving the liquid crystal display element, wherein the liquid crystal drive circuit connects the liquid crystal display element to the liquid crystal drive LSI. A method of forming a liquid crystal display device, comprising:
After providing the SI, the liquid crystal substrate is bent by 90 degrees in the direction in which the liquid crystal drive circuit surface exists, thereby forming a driving LSI.
A method for forming a liquid crystal display device for forming a mounting portion. 14. A liquid crystal display device comprising at least a liquid crystal substrate according to claim 6, a liquid crystal display element, and a liquid crystal drive LSI for driving said liquid crystal display element, wherein said liquid crystal drive circuit connects said liquid crystal display element to said liquid crystal drive LSI. A method of forming a liquid crystal display device, comprising:
After providing the SI, the liquid crystal substrate is bent by 180 degrees in the direction in which the liquid crystal drive circuit surface exists, thereby driving the liquid crystal substrate.
A method for forming a liquid crystal display device for forming an I mounting portion.