JPH11305201A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display(LED) device capable of reducing the crack or breakage of an LCD panel due to vibration, shock or the like and preventing the generation of cullet from the edge part of the LCD panel. SOLUTION: In this LCD device, a protection film 2 is formed so as to cover the edge part of an LCD panel 1 or the film 2 is formed only on the divided surface of the panel 1. The film 2 reinforces the edge part of the panel 1, reduces the crack or breakage of the panel 1 due to vibration, shock or the like and prevents the generation of cullet from the edge part of the panel 1. Although an ultraviolet curing resin or an urethane resin having elasticity is preferable as a material to be used for the film 2, the conditions other than the resin having an adhesive property with the LCD panel 1 are not especially restricted as the material. The protective film 2 may be applied with molten glass.

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, and more particularly to a liquid crystal display device having a protective layer provided at an edge of a liquid crystal display panel.

[0002]

2. Description of the Related Art In a liquid crystal display device, a liquid crystal is sandwiched between a pair of opposing substrates on which electrodes are formed, and an electric signal is applied between the electrodes to control a polarization component of incident light from the outside. The information is displayed by controlling the amount of transmission. Further, the liquid crystal display device has features that it consumes much less power than a CRT, is thin and lightweight, and has a flat screen. Therefore, the liquid crystal display device is attracting attention as a next-generation display device, and its production is increasing year by year.

Many liquid crystal display devices use a glass substrate as a substrate, and as shown in FIG. 5, it is advantageous in terms of cost. Therefore, a plurality of liquid crystal display panels 52 are manufactured by dividing a large glass substrate 51. ing.

[0006] As shown in FIG. 6, a diamond cutter 53 or the like is used to cut the glass substrate 51, and the cut surface is minute at the end of the glass substrate 51 as shown in FIG. Chipping occurs, or the corner of the glass substrate 51 is sharp as shown in FIG. 7B.

[0005] In this state, if no processing is performed after the glass substrate is cut, the glass substrate is structurally brittle in cross section, and the glass substrate is cracked, broken, chipped, or broken from the cross section. There is a problem that minute dust (cullet) is easily generated.

When cullet is generated, the cullet enters the display area of the liquid crystal display panel to degrade the display quality, or causes poor contact when a signal line for driving the liquid crystal display panel is attached to a terminal of the liquid crystal display panel. And so on. Therefore, as shown in FIG. 8, the edge portion of the liquid crystal display panel 51 is usually chamfered.

[0007]

When the edge of the liquid crystal display panel is chamfered, the processing accuracy is several tens to ten.
Since an accuracy of about 100 μm is required, a well-controlled device is required to stably perform processing with this accuracy, and the device cost becomes expensive.

In addition, when chamfering is performed, cullet is generated at the time of chamfering, and the above-described problem occurs due to the cullet. Therefore, it is necessary to remove the cullet by washing.

Further, if the chamfering amount exceeds a specified value due to a device trouble or the like, the chamfering cannot be performed again, and the liquid crystal display panel must be discarded as a defective product.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and it is possible to reduce the possibility that a liquid crystal display panel is cracked or chipped due to vibration or impact, and to reduce the likelihood of an edge portion of the liquid crystal display panel. It is an object of the present invention to provide a liquid crystal display device capable of preventing the occurrence of cullet.

[0011]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising a pair of substrates, wherein a liquid crystal is sandwiched between the pair of substrates, and the edge portions of the pair of substrates are protected. It is characterized in that a layer is formed.

The liquid crystal display device according to the second aspect is the first aspect.
In the liquid crystal display device described above, a base film is formed between the substrate and the protective layer.

According to the liquid crystal display device of the present invention, since the protective layer is formed on the edge portions of the pair of substrates, the liquid crystal display panel is prevented from being cracked or chipped due to vibration or shock, and the The generation of cullet from the edge of the display panel can be prevented. Further, the protective film can be formed again by rework.

Further, since the base film is formed between the substrate and the protective layer, the protective film can be efficiently formed in a short time.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view illustrating an edge portion of a liquid crystal display panel according to the present embodiment, FIG. 2 is a perspective view illustrating a method for forming a protective film, FIG. 3 is a perspective view illustrating another method for forming a protective film, FIG. 4 is a sectional view showing another example of the edge portion of the liquid crystal display panel according to the present embodiment.

In the liquid crystal display device according to the present embodiment, as shown in FIG. 1A, a protective film 2 is formed so as to cover an edge portion of a liquid crystal display panel 1, or FIG. As shown in FIG.
Are formed.

The protective film 2 reinforces the edge of the liquid crystal display panel 1 to reduce breakage or chipping of the liquid crystal display panel 1 due to vibration or impact, and to reduce cullet from the edge of the liquid crystal display panel 1. The occurrence of is prevented.

The material used for the protective film 2 is preferably an ultraviolet curable resin or an elastic urethane resin, but is not particularly limited as long as it is a resin having an adhesive property to the liquid crystal display panel 1. Alternatively, the protective film 2 may be formed by applying molten glass.

As a method for forming the protective film 2, as shown in FIG. 2, a resin 4 is applied to an edge portion of the liquid crystal display panel 1 by a dispenser 3, or as shown in FIG. The protective film 2 may be formed by immersing the liquid crystal display panel 1 in 5.

At the edge of the liquid crystal display panel 1 after the division, a chip of about 150 μm is generated at most, so that the edge of the liquid crystal display panel 1 has a thickness of 200 μm.
What is necessary is just to form the protective film 2 to the extent.

When the protective film 2 is formed, the edge of the liquid crystal display panel 1 is not directly formed of the above-described material with the protective film 2 but instead, a silicon resin or the like having excellent permeability is applied as a base film. Alternatively, the protective film 2 may be formed on the edge of the liquid crystal display panel 1 by filling the fine irregularities.

In this case, first, a silicon resin or the like which easily penetrates into the small gap is applied to the edge of the liquid crystal display panel 1 with a thickness of 50%.
The protective film 2 can be efficiently formed in a short time by applying a resin having a thickness of about μm and forming a resin having excellent adhesiveness and a short curing time. At this time, the silicon resin as the base film may not be cured.

After the resin 4 is applied to the edge of the liquid crystal display panel 1, the excess resin 4 is wiped off and the resin 4 is cured to form the protective film 2. When an ultraviolet curable resin is used as the resin 4, the wavelength is 350 nm and the power is 700 to 100.
Irradiation with 0 mW ultraviolet rays may be performed for about 20 seconds.

In this way, even if the edge portion of the liquid crystal display panel 1 is chipped as shown in FIG. 4A, the liquid crystal display panel 1 is cut off as shown in FIG. Even when the corners are sharp, the liquid crystal display panel 1 can be prevented from cracking or chipping due to vibration or impact, and the generation of cullet from the edge of the liquid crystal display panel 1 can be prevented. Further, the protective film 2 can be formed again by rework.

[0025]

As described above, according to the liquid crystal display device of the present invention, since the protective layer is formed on the edges of the pair of substrates, the liquid crystal display panel is prevented from cracking or chipping. It is possible to reduce defects and prevent defects caused by cullet. Furthermore, since the protective film can be formed again by rework, the yield rate does not decrease.

Further, since the base film is formed between the substrate and the protective layer, the protective film can be efficiently formed in a short time.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views showing an edge portion of a liquid crystal display panel according to the present embodiment.

FIG. 2 is a perspective view illustrating a method for forming a protective film.

FIG. 3 is a perspective view illustrating another method for forming a protective film.

FIGS. 4A and 4B are cross-sectional views showing another example of an edge portion of the liquid crystal display panel according to the present embodiment.

FIG. 5 is a plan view showing a dividing line of the glass substrate.

FIG. 6 is an explanatory view showing a method for cutting a glass substrate.

FIG. 7 is a cross-sectional view showing an end of the glass substrate.

FIG. 8 is a sectional view showing chamfering of an edge portion of the liquid crystal display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Protective film 3 Dispenser 4 Resin 5 Container 51 Glass substrate 52 Liquid crystal display panel 53 Diamond cutter

Claims (2)

[Claims] 1. A liquid crystal display device comprising a pair of substrates, wherein a liquid crystal is sandwiched between the pair of substrates, and a protective layer is formed at an edge of the pair of substrates. 2. The liquid crystal display device according to claim 1, wherein a base film is formed between said substrate and said protective layer.