JP2001318387A - Liquid crystal display panel and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid crystal display panel capable of preventing a liquid crystal from being contaminated and deteriorated by a sealant and provided with a picture frame with a narrow width outside the display region. SOLUTION: An L shaped projecting part 5 is formed on an outer peripheral part of the display region of a driving element substrate 1. A liquid crystal material 7 is dropped to a part surrounded by the L shaped projecting part 5. A recessing part of the L shaped projecting part 5 is coated with the sealant 4. Gap members 6 are sprayed on a counter substrate 2. After superposing the driving element substrate 1 and the counter substrate 2 with each other the sealant 4 is cured so as to stick the both substrates together and to manufacture the liquid crystal display panel.

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 panel, and more particularly, to a liquid crystal display panel manufactured by a drop injection method and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been widely used for displays of personal computers, televisions, and the like because of their characteristics of being thin and lightweight, being driven at a low voltage, and having low power consumption. A liquid crystal display panel constituting a liquid crystal display device has a structure in which liquid crystal is sealed between two transparent substrates.

Conventionally, a vacuum injection method and a drop injection method have been known as methods for sealing liquid crystal between two transparent substrates.
In the vacuum injection method, a pair of transparent substrates are bonded together with a granular spacer sandwiched between them, and a space for liquid crystal injection and a liquid crystal injection port are created in advance. It is a method of injecting. However, this vacuum injection method requires evacuation for several hours to obtain a sufficient degree of vacuum except for the gas adsorbed in the space into which the liquid crystal is injected, which is problematic in terms of productivity.

As a manufacturing method for solving this problem, a drop injection method has been proposed. The drop injection method is a method that does not require an injection port, and is a method in which a liquid crystal material is dropped on one transparent substrate, and the other transparent substrate is overlapped to seal the liquid crystal. According to this drop injection method, the time required for enclosing the liquid crystal is greatly reduced, and the productivity is higher than that of the vacuum injection method.

A conventional liquid crystal display panel has a structure as shown in FIG. 4. A sealing material 4 is applied to a driving element substrate 1 or a counter substrate 2 so as to surround a display area, and a liquid crystal material 7 is dropped. It is manufactured by laminating two substrates and curing the sealing material 4. The problem of the conventional liquid crystal display panel shown in FIG. 4 is that the liquid crystal material 7 is in direct contact with the sealing material 4, so that the liquid crystal material 7 is contaminated and deteriorated by the contact with the sealing material 4. As a countermeasure against contamination and deterioration of the liquid crystal material 7 due to contact with a certain sealing material 4, Japanese Patent Application Laid-Open No. 11-38424 proposes a liquid crystal display panel having a structure as shown in FIG. In this liquid crystal display panel, a projection 8 made of a photosensitive resin or the like is formed on the driving element substrate 1 or the counter substrate 2 so as to surround the display area. , The liquid crystal material 7 is dropped on the display area. On the other hand, the gap material 6 is sprayed on the substrate on which the convex portion is not formed, and the two substrates are overlapped with each other, and the sealing material 4 is cured to manufacture.
In the structure of the liquid crystal display panel, since the sealing material 4 does not directly contact the liquid crystal material 7 due to the projections 8, the liquid crystal material 7 is not contaminated or deteriorated by the contact with the sealing material 4.

[0006]

However, in the liquid crystal display panel having the structure shown in FIG. 5, since the projection 8 and the sealing material 4 are further arranged outside the display area of the panel, the display area of the liquid crystal display panel is reduced. There is a problem that the outside frame width becomes large.

As a common problem of the liquid crystal display panels shown in FIGS. 4 and 5, a sealing material 4 is attached to a height corresponding to the diameter of the gap material 6 so that the driving element substrate 1 and the opposing substrate 2 are bonded to each other. In some cases, the amount of the sealing material 4 used may increase.

An object of the present invention is to solve the above problems by providing an L-shaped projection on a substrate, and a liquid crystal display panel having a sealing material in a recessed portion of the L-shaped projection and this liquid crystal display. An object of the present invention is to provide a manufacturing method of a panel by a drop injection method.

[0009]

According to the present invention, there is provided a liquid crystal display panel manufactured by a drop-injection method, wherein an L-shaped projection is formed around a display area, and the L-shaped projection is formed. Liquid crystal display that prevents the liquid crystal material from being contaminated and deteriorated by contact with the seal material by applying the seal material to the depressions, and that can reduce the frame outside the display area and reduce the amount of seal material used A panel is obtained. That is, an L-shaped convex portion is provided on the outer periphery of the display region, a liquid crystal material is dropped in the display region surrounded by the L-shaped convex portion, and a sealing material is applied to the concave portion of the L-shaped convex portion. After overlapping the applied drive element substrate and the opposing substrate provided with the gap material, the sealing material is cured to obtain a liquid crystal display panel in which both substrates are bonded. The L-shaped protrusion is formed of a photosensitive resin film,
The depression of the L-shaped protrusion is provided in an outer portion that does not contact the liquid crystal material.

Further, according to the present invention, an L-shaped projection is provided on the outer periphery of the display area, and a liquid crystal material is dropped into the display area surrounded by the L-shaped projection. A liquid crystal display panel is obtained in which a counter substrate coated with a sealing material in a depressed portion and a driving element substrate provided with a gap material are laminated, and then the sealing material is cured to bond the two substrates together. . The L-shaped protrusion is formed of a photosensitive resin film,
The depression of the L-shaped protrusion is provided in an outer portion that does not contact the liquid crystal material.

Further, according to the present invention, a step of providing an L-shaped protrusion on the outer peripheral portion of the display area of the driving element substrate, a step of applying a sealing material to a depression of the L-shaped protrusion, A step of dropping a liquid crystal material on a display region surrounded by a mold projection, a step of distributing and disposing a gap material on a counter substrate, a step of overlapping the drive element substrate and the counter substrate, And bonding the driving element substrate and the opposing substrate to each other to obtain a liquid crystal display panel manufacturing method. The L-shaped convex portion may be provided on the counter substrate side, and the dispersion of the gap material may be performed on the drive element substrate side. The L-shaped protrusion can be formed by exposing and developing a photosensitive resin film.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a liquid crystal display panel according to a first embodiment of the present invention. FIGS. 2 and 3 are a drive element substrate and a drive element substrate, respectively, for explaining a method of manufacturing the liquid crystal display panel of the present invention. It is a top view of a counter substrate.
As shown in FIG. 1, FIG. 2, and FIG. 3, an alignment film 3 is applied to the driving element substrate 1 and the counter substrate 2, and an L layer such as a photosensitive resin film is formed on an outer peripheral portion of the display area on the driving element substrate 1 side. A letter-shaped convex portion 5 is formed. A gap member 6 is provided on the counter substrate 2 side. The sealing material 4 is applied to the depressed portion of the L-shaped convex portion 5, and the liquid crystal material 7
It is arranged by dripping. After the driving element substrate 1 and the opposing substrate 2 are superposed in a vacuum, the sealing material 4 is cured and the two substrates are bonded together. The depression of the L-shaped convex portion 5 is formed on an outer portion so that the sealing material 4 applied thereto does not contact the liquid crystal material 7.

Next, a method for manufacturing the liquid crystal display panel of the present embodiment will be described with reference to FIGS. As shown in FIG. 2, an L-shaped convex portion 5 is formed on the outer peripheral portion of the display area of the driving element substrate 1. The L-shaped convex portion 5 is formed by exposing and developing a photosensitive resin film. Next, after applying the alignment film 3 to the driving element substrate 1 and the opposing substrate 2, as shown in FIG. 3, a gap material 6 having the same diameter as the height of the L-shaped convex portion 5 is sprayed on the opposing substrate 2, The sealing material 4 is applied to the depressed portion formed on the outer portion of the L-shaped convex portion 5 on the element substrate 1. This sealing material may be either a thermosetting type or an ultraviolet setting type. Further, a liquid crystal material 7 is dropped on a portion of the driving element substrate 1 surrounded by the L-shaped convex portion 5,
The drive element substrate 1 and the opposing substrate 2 are overlapped in a vacuum.
Heating or UV while pressing the stacked substrates from above and below
Irradiation (ultraviolet light) cures the sealing material 4 and diffuses the liquid crystal material 7. Thus, the manufacturing of the liquid crystal display panel is completed by bonding the driving element substrate 1 and the opposing substrate 2 together.

As described above, in the liquid crystal display panel of the present embodiment, the liquid crystal material and the sealing material do not come into direct contact with each other due to the L-shaped convex portion arranged on the outer peripheral portion of the display area. Contamination and deterioration can be prevented. In addition, since the sealing material is applied to the concave portion of the L-shaped convex portion, the frame width outside the display area of the liquid crystal display panel may be only the width of the L-shaped convex portion. Will be possible. Further, since the sealing material is applied only to the depressions of the L-shaped protrusions, there is an advantage that the amount of the sealing material used can be reduced.

Next, a second embodiment of the present invention will be described. In the first embodiment, the case where the L-shaped protrusion is provided on the drive element substrate side has been described. However, the L-shaped protrusion is provided on the counter substrate side, a sealing material is applied, and the drive element substrate side is provided. A gap material is scattered, and a liquid crystal material is dropped on a portion of the opposing substrate surrounded by the L-shaped protrusion, and the driving element substrate 1 is placed in a vacuum.
And the opposing substrate 2 are overlapped. The sealing material is cured by heating or UV irradiation while pressing the superposed substrates from above and below, and the liquid crystal material is diffused. In this manner, the liquid crystal display panel is manufactured by bonding the drive element substrate and the counter substrate. In the second embodiment, the same effects as in the first embodiment can be obtained.

[0016]

The first effect of the present invention is that contamination and deterioration of the liquid crystal material due to contact with the sealing material can be prevented. The reason for this is that the liquid crystal material and the sealing material do not come into direct contact with each other due to the L-shaped projections arranged around the display area.

As a second effect, it is possible to narrow the frame outside the display area of the liquid crystal display panel. The reason is that, since the sealing material is applied to the recessed portion of the L-shaped protrusion, the frame width may be only the width of the L-shaped protrusion, and further, there is no need to apply the sealing material to the outer periphery.

As a third effect, the amount of the sealing material used can be reduced. The reason is the second
This is because the sealing material is applied only to the concave portion of the L-shaped convex portion as described in the above effect.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the driving element substrate according to the first embodiment of the present invention.

FIG. 3 is a plan view of the counter substrate according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional liquid crystal display panel.

FIG. 5 is a cross-sectional view of another conventional liquid crystal display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driving element substrate 2 Counter substrate 3 Alignment film 4 Sealing material 5 L-shaped convex part 6 Gap material 7 Liquid crystal material 8 Convex part

Claims (8)

[Claims] 1. An L-shaped convex portion is provided on an outer peripheral portion of a display region, and a liquid crystal material is dropped in a display region surrounded by the L-shaped convex portion.
After the drive element substrate in which the sealing material was applied to the depressed portion of the L-shaped convex portion and the opposing substrate in which the gap material was provided were overlapped, the sealing material was cured and both substrates were bonded. A liquid crystal display panel characterized by the above-mentioned. 2. The liquid crystal display panel according to claim 1, wherein the depression of the L-shaped convex portion is provided on an outer portion not in contact with the liquid crystal material. 3. The liquid crystal display panel according to claim 1, wherein the L-shaped convex portion is formed of a photosensitive resin film. 4. An L-shaped convex portion is provided on an outer peripheral portion of the display region, and a liquid crystal material is dropped in a display region surrounded by the L-shaped convex portion.
After the opposing substrate in which the sealing material was applied to the depressed portion of the L-shaped convex portion and the driving element substrate in which the gap material was disposed were overlapped, the sealing material was cured and both substrates were bonded. A liquid crystal display panel characterized by the above-mentioned. 5. The liquid crystal display panel according to claim 4, wherein the depression of the L-shaped convex portion is provided on an outer portion not in contact with the liquid crystal material. 6. A step of providing an L-shaped projection on an outer peripheral portion of a display area of the driving element substrate, a step of applying a sealing material to a depression of the L-shaped projection, and a step of enclosing the L-shaped projection. Dropping a liquid crystal material onto the display area, disposing a gap material on the opposing substrate, disposing the gap material on the opposing substrate, laminating the driving element substrate and the opposing substrate, and curing the sealing material to drive the driving element. Bonding a substrate and an opposing substrate to each other. 7. The method for manufacturing a liquid crystal display panel according to claim 6, wherein the L-shaped convex portion is provided on a counter substrate side, and the application of the gap material is performed on a drive element substrate side. 8. The method for manufacturing a liquid crystal display panel according to claim 6, wherein the L-shaped convex portion is formed by exposing and developing a photosensitive resin film.