JP2002350877A - Liquid crystal display device and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the quality for which image defects are suppressed by sufficiently hardening a sealing material through efficient irradiation with ultraviolet ray. SOLUTION: The liquid crystal display device is constituted by sticking a glass substrate 12 for driving liquid crystal and a counter glass substrate 13 together and injecting a liquid crystal material 14 between both the substrates 12 and 13. The sealing material 15 which seals an injection part is ultraviolet-ray setting resin, and films 18 having ultraviolet-ray reflection characteristics are formed on the outer surfaces of the glass substrates 12 and 13 in the area where the sealing material 15 is present. When the irradiating ultraviolet rays from a glass substrate end surface travel, being repeatedly reflected in the glass substrates in a process of hardening the sealing material 15 by the ultraviolet- ray irradiation, the ultraviolet rays are reflected again by the opposite glass reverse surface (outer surface) from the glass surface where the liquid crystal is present to decrease the loss of the quantity of the ultraviolet rays which should irradiate the sealing material 15.

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 device in which a liquid crystal driving glass substrate and an opposing glass substrate are bonded to each other, a liquid crystal material is injected between the substrates, and the injected portion is sealed with an ultraviolet curable resin. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, a glass substrate for driving a liquid crystal and an opposing glass substrate having a color filter and the like are bonded together and a liquid crystal material is injected. A light-curable resin is used, and in the manufacturing process, the sealing material is cured by irradiating ultraviolet rays after applying the sealing material.

A cross-sectional structure near a liquid crystal material injection portion and a manufacturing process in a conventional liquid crystal display device will be described below.

FIG. 2 is a cross-sectional view of a portion near a liquid crystal material injection portion in a conventional liquid crystal display device, wherein 1 is a liquid crystal driving glass substrate, 2 is a counter glass substrate, 3 is a liquid crystal material, and 4 is a liquid crystal material 3. An ultraviolet ray-curable sealant for stopping the irradiation, 5 is an irradiation direction of the ultraviolet ray, and 6 is an ultraviolet ray propagating in the glass substrate. FIG. 3 is a plan view of the vicinity of the liquid crystal material injection portion in the liquid crystal display device.
Denotes a liquid crystal material filled region, 9 denotes a seal material for holding the liquid crystal material, 10 denotes an ultraviolet ray curable sealant for sealing the liquid crystal material, and 11 denotes an irradiation direction of ultraviolet rays.

[0005] The glass substrates 1 and 2 are bonded together with a sealing material 9 shown in FIG. 3, and after injecting the liquid crystal material 3, an ultraviolet ray curable sealant 4 is applied, and ultraviolet rays are irradiated from the direction of 5. Thus, the sealant 4 is cured. The liquid crystal display device is configured through these steps.

[0006]

However, in the above-mentioned conventional liquid crystal display device, in the step of curing the ultraviolet ray curable sealant by irradiating the ultraviolet ray, the ultraviolet ray radiated from the end face of the glass substrate is irradiated inside the glass substrate. When the light is repeatedly reflected and propagates in the direction of 6, ultraviolet rays are transmitted through the glass back surface opposite to the glass surface where the liquid crystal material is present,
The amount of ultraviolet light to be applied to the sealant causes a loss. As a countermeasure, there is a means of increasing the amount of ultraviolet light irradiation. However, since there are adverse effects such as deterioration of the liquid crystal material due to the influence of the ultraviolet light and a change in the characteristics of the thin film transistor (TFT) for driving the liquid crystal, the amount of irradiation of the ultraviolet light is reduced. However, there is a problem that image defects such as display unevenness due to contamination of the liquid crystal material due to insufficient curing of the sealing material occur.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems, and in the liquid crystal display device of the present invention, the ultraviolet rays are efficiently radiated to the sealing agent.
An object of the present invention is to provide a liquid crystal display device having stable quality by suppressing the occurrence of image defects by sufficiently curing the sealing material, and a method of manufacturing the same.

[0008]

In order to achieve this object, a liquid crystal display device according to a first aspect of the present invention comprises a liquid crystal driving glass substrate and an opposing glass substrate bonded together, and a liquid crystal material interposed between the two substrates. What is claimed is: 1. A liquid crystal display device configured by sealing an injection portion for injection, wherein a sealing material for sealing the injection portion is an ultraviolet-curing resin, and a liquid crystal driving device in a region where the sealing material exists. On the outer surfaces of the glass substrate and the opposing glass substrate, a film having ultraviolet light reflection characteristics was formed.

As described above, the sealing material for sealing the injection portion is an ultraviolet curable resin, and the ultraviolet light reflection characteristics are provided on the outer surfaces of the liquid crystal driving glass substrate and the counter glass substrate in the region where the sealing material is present. Since the film having the formed, in the step of curing the sealing material by ultraviolet light irradiation, when the ultraviolet light irradiated from the end face of the glass substrate is repeatedly reflected inside the glass substrate, the glass surface where the liquid crystal material is present The ultraviolet light is reflected again on the reverse glass back surface (outer surface), and the loss as the amount of ultraviolet light to be applied to the sealing material can be reduced.

The liquid crystal display device according to the second aspect is the first aspect.
In the liquid crystal display device described above, a film having ultraviolet light reflection characteristics was formed on one of the outer surfaces of the liquid crystal driving glass substrate and the opposite glass substrate. In this manner, a film having an ultraviolet ray reflection characteristic is formed on one of the outer surfaces of the liquid crystal driving glass substrate and the opposite glass substrate.
The operation and effect of the invention can be obtained.

The liquid crystal display device according to the third aspect is the first aspect.
In the liquid crystal display device described above, the film formed on the outer surface of the liquid crystal driving glass substrate and the opposite glass substrate is a metal film. As described above, since the films formed on the outer surfaces of the liquid crystal driving glass substrate and the opposing glass substrate are metal films, ultraviolet light reflection characteristics can be obtained.

According to a fourth aspect of the invention, there is provided a liquid crystal display device.
In the liquid crystal display device described above, the film formed on the outer surface of the liquid crystal driving glass substrate and the opposite glass substrate is a dielectric film. Thus, since the film formed on the outer surface of the liquid crystal driving glass substrate and the opposite glass substrate is a dielectric film,
An ultraviolet light reflection characteristic is obtained.

A method of manufacturing a liquid crystal display device according to claim 5, wherein a step of bonding a glass substrate for driving a liquid crystal and a counter glass substrate, a step of injecting a liquid crystal material between the two substrates, and a step of injecting the liquid crystal material. Sealing with a sealing material of an ultraviolet curable resin, and forming a film having an ultraviolet ray reflection characteristic on the outer surface of the liquid crystal driving glass substrate and the opposite glass substrate in a region where the sealing material is present. And a step of performing ultraviolet curing of the sealing material.

As described above, the step of sealing the injection portion of the liquid crystal material with the sealing material of the ultraviolet curable resin and the step of sealing the outer surface of the liquid crystal driving glass substrate and the opposite glass substrate in the region where the sealing material exists are performed. Since the method includes a step of forming a film having light reflection properties and a step of curing the sealing material with ultraviolet rays, in the curing step of the sealing material, ultraviolet rays irradiated from the end surface of the glass substrate reflect inside the glass substrate. When repeatedly proceeding, the ultraviolet light is reflected again on the glass back surface (outer surface) opposite to the glass surface where the liquid crystal material is present, and the loss as the amount of ultraviolet light to be irradiated on the sealing material can be reduced. .

According to a sixth aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device according to the fifth aspect.
After the step of performing the ultraviolet curing of the sealing material, a step of removing the film having the ultraviolet ray reflection characteristic is included. As described above, after the step of curing the sealing material with ultraviolet light, the step of removing the film having the ultraviolet light reflection characteristic is included, so that the film having the ultraviolet light reflection characteristic in the state of the product can be eliminated.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a sectional view of the vicinity of a liquid crystal material injection portion in a liquid crystal display device according to an embodiment of the present invention. 12 is a glass substrate for driving a liquid crystal, 13 is a counter glass substrate, 14 is a liquid crystal material, 15 is an ultraviolet ray curable sealant, 16 is an irradiation direction of ultraviolet light, 17 is an ultraviolet light propagating in the glass substrate, 18 is 3 shows a film having ultraviolet light reflection characteristics.

In FIG. 1, the sealing material for sealing the injection portion is an ultraviolet ray curable resin, and the liquid crystal driving glass substrate 12 and the opposing glass substrate 13 in the region where the ultraviolet ray curable sealing material 15 exists. In the step of curing the ultraviolet ray curable sealing material 15 by ultraviolet ray irradiation 16 with the film 18 having ultraviolet ray reflection characteristics formed on the back surface (outer side), the ultraviolet ray irradiated from the glass substrate end face shown in 17 When the light beam is repeatedly reflected inside the glass substrate, the ultraviolet light is reflected again on the glass back surface opposite to the glass surface where the liquid crystal material is present, and the loss as the amount of ultraviolet light to be applied to the sealing agent 15 is lost. Can be reduced.

Regarding the method of manufacturing the liquid crystal display device,
A step of bonding the liquid crystal driving glass substrate 12 and the opposing glass substrate 13, a step of injecting the liquid crystal material 14 between the substrates 12 and 13, and a step of injecting the liquid crystal material 14 with a sealing material 15 of an ultraviolet curable resin. A step of sealing, a step of forming a film 18 having ultraviolet light reflection characteristics on the outer surface of the liquid crystal driving glass substrate 12 and the opposite glass substrate in a region where the sealing material 15 is present, And a step of curing.

Further, a film 18 having an ultraviolet ray reflection characteristic
Are the liquid crystal driving glass substrate 12 and the opposing glass substrate 13
It is sufficient to form them on both or one of the back surfaces of the substrate, and the effect can be obtained with one of them.

Further, the film 18 having an ultraviolet ray reflection characteristic
The material may be a metal film or a dielectric film as long as it has a characteristic of reflecting ultraviolet light, and there is no limitation on the material.

The film 18 having an ultraviolet ray reflection characteristic
May be removed after the step of curing the sealing material with ultraviolet light.

As described above, according to the first embodiment of the present invention, in the step of curing the ultraviolet ray curable encapsulating material 15 by the ultraviolet ray irradiation 16, the ultraviolet ray irradiated from the end face of the glass substrate shown in FIG. When repeating the reflection inside the glass substrate, the ultraviolet ray is reflected again on the glass back surface opposite to the glass surface where the liquid crystal material is present,
The loss as the amount of ultraviolet light to be irradiated on the sealing agent can be reduced, and the occurrence of image defects due to the uncured sealing material can be suppressed. A liquid crystal display device with stable quality can be obtained.

[0024]

According to the liquid crystal display device of the present invention, the sealing material for sealing the injection portion is an ultraviolet curable resin, and the glass substrate for driving the liquid crystal in the region where the sealing material exists. And since a film having ultraviolet light reflection properties was formed on the outer surface of the opposite glass substrate, in the step of curing the sealing material by irradiation with ultraviolet light, the ultraviolet light irradiated from the glass substrate end face repeatedly reflected inside the glass substrate. When proceeding, the ultraviolet light is reflected again on the glass back surface (outside surface) opposite to the glass surface on which the liquid crystal material is present, and the loss as the amount of ultraviolet light to be applied to the sealing material can be reduced.

As described above, since the sealing material can be cured by efficiently irradiating the sealing material with ultraviolet rays, the occurrence of image defects due to contamination of the liquid crystal material due to the effect of the uncured sealing material can be suppressed. Thus, a liquid crystal display device with stable quality can be obtained.

According to the second aspect, the function and effect of the first aspect can also be obtained by forming a film having an ultraviolet ray reflection characteristic on one of the outer surfaces of the liquid crystal driving glass substrate and the opposite glass substrate.

According to the third aspect, since the film formed on the outer surface of the glass substrate for driving the liquid crystal and the opposite glass substrate is a metal film, an ultraviolet ray reflection characteristic can be obtained.

In the fourth aspect, since the film formed on the outer surface of the glass substrate for driving the liquid crystal and the opposite glass substrate is a dielectric film, an ultraviolet ray reflection characteristic can be obtained.

According to the method of manufacturing a liquid crystal display device according to the fifth aspect of the present invention, the step of sealing the injection portion of the liquid crystal material with the sealing material of the ultraviolet curable resin and the step of sealing the region where the sealing material is present The method includes a step of forming a film having ultraviolet light reflection properties on the outer surface of the liquid crystal driving glass substrate and the opposite glass substrate, and a step of performing ultraviolet curing of the sealing material. When the ultraviolet light irradiated from the substrate end surface repeats reflection inside the glass substrate,
Ultraviolet rays are reflected again on the glass back surface (outside surface) opposite to the glass surface on which the liquid crystal material is present, and the loss as the amount of ultraviolet light to be applied to the sealing material can be reduced.

In the sixth aspect, after the step of curing the sealing material with ultraviolet light, the step of removing the film having the ultraviolet ray reflection characteristic is included, so that the film having the ultraviolet ray reflection characteristic in the state of the product is eliminated. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view near a liquid crystal material injection portion in a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view near a liquid crystal material injection portion in a conventional liquid crystal display device.

FIG. 3 is a plan view showing the vicinity of a liquid crystal material injection portion in a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass substrate for liquid crystal drive 2 Opposite glass substrate 3 Liquid crystal material 4 Ultraviolet ray hardening sealant (sealing material) 5 Irradiation direction of ultraviolet light 6 Ultraviolet light propagating in a glass substrate 7 Glass substrate for liquid crystal drive 8 Liquid crystal material Filling area 9 Sealing material for holding liquid crystal material 10 Ultraviolet ray curable sealant for sealing liquid crystal material 11 Irradiation direction of ultraviolet ray 12 Glass substrate for driving liquid crystal 13 Opposing glass substrate 14 Liquid crystal material 15 Ultraviolet ray Curable sealant (sealing material) 16 Irradiation direction of ultraviolet light 17 Ultraviolet light propagating in glass substrate 18 Film having ultraviolet light reflection characteristics

Claims (6)

[Claims] 1. A liquid crystal display device comprising a liquid crystal driving glass substrate and a counter glass substrate bonded to each other, and an injection part for injecting a liquid crystal material between the two substrates is sealed. The sealing material to be stopped is an ultraviolet curable resin, and a film having an ultraviolet ray reflection characteristic is formed on the outer surface of the liquid crystal driving glass substrate and the opposite glass substrate in a region where the sealing material is present. Characteristic liquid crystal display device. 2. The liquid crystal display device according to claim 1, wherein a film having an ultraviolet light reflection characteristic is formed on one of the outer surfaces of the liquid crystal driving glass substrate and the opposite glass substrate. 3. The liquid crystal display device according to claim 1, wherein the films formed on the outer surfaces of the liquid crystal driving glass substrate and the opposing glass substrate are metal films. 4. The liquid crystal display device according to claim 1, wherein the films formed on the outer surfaces of the liquid crystal driving glass substrate and the opposing glass substrate are dielectric films. 5. A step of bonding a glass substrate for driving a liquid crystal and a counter glass substrate, a step of injecting a liquid crystal material between the two substrates, and sealing an injection portion of the liquid crystal material with a sealing material of an ultraviolet curable resin. Stopping, forming a film having ultraviolet light reflection properties on the outer surfaces of the liquid crystal driving glass substrate and the counter glass substrate in a region where the sealing material is present, and curing the sealing material with ultraviolet light. And a method of manufacturing a liquid crystal display device. 6. After the step of performing ultraviolet curing of the sealing material,
6. The method for manufacturing a liquid crystal display device according to claim 5, further comprising a step of removing a film having ultraviolet light reflection characteristics.