KR100683157B1 - LCD display device - Google Patents

Abstract

The disclosed liquid crystal display includes an upper substrate provided with a black matrix on one surface, a lower substrate spaced apart from the upper substrate, a liquid crystal layer interposed between the upper substrate and the lower substrate, and a liquid crystal layer on all sides between the upper substrate and the lower substrate. And a sealant to seal the display area, the display area and the non-display area, and the black matrix is formed to be inclined obliquely from the display area to the sealant side so that the cell gap of the display area is larger than the cell gap on the sealant side, thereby filling the liquid crystal. By expanding the volume and delaying the flow of the liquid crystal, the curing time of the uncured sealant is secured.When the liquid crystal comes into contact with the sealant, the liquid crystal is prevented from being contaminated by the organic material of the sealant to prevent deterioration of screen quality. It provides an effect that can be done.

Description

Liquid crystal display device

1 is a cross-sectional view showing a conventional liquid crystal display device;

2 is a cross-sectional view showing a liquid crystal display device according to an embodiment of the present invention;

3 is a view showing an inclined portion of the black matrix of FIG.

<Description of Symbols for Main Parts of Drawings>

100 ... LCD 110. Upper substrate

112 ... Black Matrix 120 ... Substrate

121 ... metal layer 130 ... liquid crystal layer (liquid crystal)

140 ... Sealant

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 for preventing liquid crystal contamination caused by contact of an uncured sealant and a liquid crystal when the liquid crystal is charged by the drop charging method.

In the manufacture of the existing liquid crystal display device, the injection of liquid crystal for forming the liquid crystal layer is performed by the vacuum liquid crystal injection method, which not only takes a long injection time, but also wastes the liquid crystal, which is inefficient in terms of mass productivity and cost reduction.

The newly proposed method is a one drop fill method, which is a method in which a liquid crystal is dropped and injected after preparing a sealant having no injection hole on an array substrate or a color filter substrate.

However, the application of this drop filling method requires a new sealant different from the existing sealant.

In other words, in the case of the conventional sealant, it is not able to contain the liquid crystal dropped due to the low viscosity of the thermosetting type, and also causes contamination of the liquid crystal due to the contact of the liquid crystal with the high fluidity, and thus, thermal curing and photocuring to solve this problem. Hybrid type sealant with mixed method appeared.

However, even when using such a hybrid type sealant, due to the process of dropping the liquid crystal before the sealant is completely cured, the sealant 16 in which the liquid crystal 15 is uncured as shown in FIG. Spreads out to the area, in particular, first spreads out to a portion where the black matrix 13 and the sealant 16 contact each other, and comes into contact with the uncured sealant 16 to contaminate the liquid crystal 15 by the organic material of the sealant 16. .

As a result, the resistivity of the liquid crystal 15 is lowered, so that the liquid crystal 15 is not driven properly when the liquid crystal display device 10 is driven, and various irregularities such as a box or a line shape are formed on the periphery of the sealant 16 or the screen display area. There is a problem of degrading the screen quality due to occurrence.

Here, reference numeral 11 denotes a color filter substrate, 12 denotes an array substrate, and 14 denotes a color filter.

The present invention has been made to solve the above problems, and an object thereof is to provide an improved liquid crystal display device which can reduce the contamination of liquid crystals by delaying the contact time between the uncured sealant and the liquid crystal.

According to an aspect of the present invention, there is provided a liquid crystal display device including: an upper substrate provided with a black matrix on one surface thereof, a lower substrate spaced apart from the upper substrate, a liquid crystal layer interposed between the upper substrate and the lower substrate; And a sealant sealing the liquid crystal layer on all sides between the upper substrate and the lower substrate to form a display area and a non-display area, and the black matrix is formed to be inclined obliquely from the display area to the sealant side. It is preferable that the cell gap of is larger than the cell gap of the sealant side.

Here, the inclination value is preferably tan (1 μm / 2 mm).

In addition, the oblique inclination is preferably formed stepwise.

In addition, it is preferable that an opaque metal layer is provided on the lower substrate overlapping the inclined portion.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, a liquid crystal display device is divided into a display area representing a screen and a non-display area not representing a screen, and have the following structure to form such an area.

That is, as shown in FIG. 2, the liquid crystal display device 100 includes an upper substrate 110, a lower substrate 120 facing the upper substrate 110 at predetermined intervals, and an upper substrate 110 and a lower substrate 120. The liquid crystal layer 130 interposed therebetween and a sealant 140 provided at an edge portion between the upper substrate 110 and the lower substrate 120.

One surface of the upper substrate 110 determines the color of the screen, and is provided with a color filter 111 consisting of RGB cells, and a black matrix 112 for dividing and blocking light between the RGB cells.

The black matrix 112 is provided in the non-display area, and is obliquely formed from the display area to the sealant 140 side, that is, to the sealant 140 side from the color filter 111 side, which is the display area. Here, the oblique inclination may be formed in a stepped manner and is inclined in the form of rising from the color filter 111 side to the sealant 140 side.

Therefore, the cell gap of the display area is larger than the cell gap on the side of the sealant 140 among the inclined portions of the black matrix 112. In the entire liquid crystal layer 130, the center of the liquid crystal layer 130, that is, the volume of the display area is increased. It becomes larger than the volume of both sides (the sealant side).

On the other hand, when the 17-inch liquid crystal display device is described with reference to FIG. 3, for example, the display area where the screen is implemented is 270.3 x 337.9 mm, and the length of the black matrix 112 of the outer portion of the color filter 111 is 3 mm. In this case, the inclined section is formed by a length of 2 mm starting from a height of 0.3 μm from the upper substrate 110, and the inclination value is tan (1 μm / 2 mm), and the inclined portion of the black matrix 112 is inclined. In the part, a volume of 3.6732 mm ³ is secured more than when the inclination is not applied.

Of course, the thickness of the black matrix 112 becomes thicker, and the longer the length of the black matrix 112 outside the color filter 111, the larger the volume secured.

On the other hand, since the inclined portion of the black matrix 112 is thinner than the conventional one, since the blocking force of the light emitted from the light source (not shown) may be lowered and light may leak, the lower substrate ( An opaque metal layer 121 is provided on the 120.

The opaque metal layer 121 is provided on the lower substrate 120 of the portion overlapping the inclined portion of the black matrix 112 to block light incident from the light source.

According to the liquid crystal display device 100 having such a structure, after the liquid crystal 130 is charged by the dropping charging method, the liquid crystal 130 of the charged liquid crystal 130 is bonded during the bonding process of the upper substrate 110 and the lower substrate 120. Flow proceeds to the sealant 140 portion via the space defined by the inclined portion of the black matrix 112.

Then, the flow of the liquid crystal 130 is delayed than the flow of the liquid crystal in the black matrix having a conventional flat shape, so that the contact time between the liquid crystal 130 and the sealant 140 is slow, and at this time, the ultraviolet light sealant 140 Irradiated to harden the uncured sealant 140.

Therefore, when the liquid crystal 130 is in contact with the sealant 140, the sealant 140 is already cured, and contamination of the liquid crystal by the organic material of the sealant 140 does not occur, thereby preventing deterioration of screen quality.

As described above, according to the liquid crystal display device of the present invention, the black matrix is inclined to expand the volume to fill the liquid crystal, thereby delaying the flow of the liquid crystal to secure the curing time of the uncured sealant, and the liquid crystal is in contact with the sealant. In this case, the liquid crystal is prevented from being contaminated by the organic material of the sealant, thereby providing an effect of preventing deterioration of the screen quality.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.

Claims (4)

An upper substrate provided with a black matrix on one surface, a lower substrate spaced apart from the upper substrate, a liquid crystal layer interposed between the upper substrate and the lower substrate, and the liquid crystal layer on all sides between the upper substrate and the lower substrate In the liquid crystal display device comprising a sealant for sealing a, to form a display area and a non-display area, And the black matrix is inclined obliquely from the display area to the sealant side such that a cell gap of the display area is larger than a cell gap of the sealant side. The method of claim 1, Wherein the inclination value is tan (1 μm / 2 mm). The method of claim 1, The oblique inclination is a liquid crystal display device, characterized in that formed in a stepped manner. The method of claim 1, The opaque metal layer is provided on the lower substrate overlapping the inclined portion.

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