KR20090053606A - Method of fabricating liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device, and in particular, by providing a dam pattern in a region between a substrate fixing adhesive and a sealing material, liquid crystal contamination by the adhesive is prevented, and a gap between the first substrate and the second substrate. The present invention relates to a method for manufacturing a liquid crystal display device in which non-uniform defects do not occur. The present invention includes the steps of providing a first substrate and a second substrate in which a display area and a non-display area are defined; Forming a rod-shaped dam pattern bent at least once on a portion of the non-display area on the first substrate; Applying a seal material to a boundary between the display area and the non-display area on the first substrate; Applying an adhesive to a non-display area on the second substrate so as to correspond to a central area of an outer area of the area where the dam pattern of the first substrate is formed; Position the first substrate and the second substrate to face each other with the same thickness as the upper and lower thicknesses of the dam, and irradiate ultraviolet (UV) light to a region where the adhesive is formed to cure the adhesive to temporarily attach the first substrate and the second substrate. The step; Bonding heat to the first substrate and the second substrate to harden a seal material to bond the first substrate to the second substrate; It is made, including.

LCD, lactite

Description

Manufacturing method of liquid crystal display device {METHOD OF FABRICATING LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a method of manufacturing a liquid crystal display device, wherein a phenomenon of preventing the substrate fixing adhesive used in the bonding operation of the first substrate and the second substrate into the liquid crystal is prevented, and the volume of the adhesive is increased during the curing of the adhesive. The present invention relates to a method for manufacturing a liquid crystal display device in which gap unevenness between the first substrate and the second substrate does not occur.

BACKGROUND ART In general, liquid crystal display devices have tended to be gradually widened due to their light weight, thinness, and low power consumption. Accordingly, the liquid crystal display device is widely used as a portable computer such as a notebook PC, office automation equipment, audio / video equipment, and the like.

In general, a liquid crystal display device displays a desired image on a screen by adjusting the amount of light transmitted according to image signals applied to a plurality of control switching elements arranged in a matrix.

Such a liquid crystal display includes a liquid crystal panel in which a color filter substrate as an upper substrate and a thin film transistor array substrate as a lower substrate are opposed to each other, and a liquid crystal layer is filled therebetween, and a scan is performed on the liquid crystal panel. And a driver for supplying signals and image information to operate the liquid crystal panel.

Hereinafter, a method of manufacturing a conventional general liquid crystal display device will be described with reference to FIGS. 1A to 1D.

First, a first substrate (see 1 in FIG. 1A) and a second substrate (see 2 in FIG. 1B) in which a display area and a non-display area are defined are provided. Here, a plurality of pixels are defined on the first substrate and the second substrate, a color filter is formed on each pixel on the first substrate, and a black matrix is formed on the boundary of each pixel, and between the first substrate and the second substrate. A column space is formed to maintain a gap between the pixel electrodes and a pixel electrode and a thin film transistor are formed in each pixel on the second substrate. In this case, the first substrate and the second substrate are mother glass for simultaneously forming a plurality of liquid crystal panels.

Next, as shown in FIG. 1A, the sealing material 5 is applied to the boundary between the display area AA and the non-display area NA on the first substrate 1, and the sealing material 5 is thermosetting. to be. Here, the seal material 5 is applied except the liquid crystal injection hole 8 region for the liquid crystal injection from the boundary between the display area AA and the non-display area NA on the first substrate 1.

Subsequently, as shown in FIG. 1B, the substrate fixing adhesive 6 is applied to the non-display area NA on the second substrate 2. The adhesive 6 is ultraviolet (UV) curable, for example lactite.

Next, as shown in FIG. 1C, the first substrate 1 and the second substrate 2 are positioned to align with each other, and then the first substrate 1 and the second substrate 2 are aligned. ) Is positioned to have a predetermined interval, and then temporarily bonded to the area where the adhesive 6 has been formed, as shown in FIG. 1D, by ultraviolet irradiation (UV) to cure the adhesive 6. The adhesive 6 cured as described above prevents the first substrate 1 and the second substrate 2 from being pushed during the subsequent curing process of the seal material 5, thereby the first substrate 1 and the second substrate 2. Keep this exactly aligned.

Then, the first substrate 1 and the second substrate 2 are completed by applying heat to the temporarily bonded first substrate 1 and the second substrate 2 to cure the seal member 5 to complete a seal pattern. To be attached. As a method of curing the seal material 5 by applying heat as described above, the first and second substrates 1 and 2 bonded together are placed on a hot plate and then heated. There is a method of applying heat after placing the first and second substrates 1 and 2 bonded in the oven.

Then, the bonded first substrate 1 and the second substrate 2 are cut into individual substrates, that is, one liquid crystal panel unit, or cut into unit substrates, that is, a plurality of liquid crystal panel units. Detailed description of the process will be omitted.

Next, the liquid crystal is injected into the display area AA between the bonded first substrate 1 and the second substrate 2, but through the liquid crystal injection hole 8 prepared during the application of the seal material 5. Inject.

Next, in the non-display area NA of the first and second substrates 1 and 2 bonded together, the area where the substrate fixing adhesive 6 is formed and the outer area of the region where the adhesive 6 is formed are cut off. By removing, a liquid crystal panel is obtained.

As described above, the conventional method of manufacturing a liquid crystal display device includes the first substrate 1 due to the adhesive 6 flowing into the liquid crystal in the display area to contaminate the liquid crystal or to increase the volume of the adhesive 6 during the curing process. There is a problem that a gap unevenness between the second substrate 2 and the second substrate 2 is caused.

This will be described in more detail as follows.

The adhesive 6 positioned between the first substrate 1 and the second substrate 2 is in a liquid state before curing, which causes the adhesive 6 to invade the display area NA due to spreading. This may cause liquid crystal contamination.

In the process of curing the adhesive 6 positioned between the first substrate 1 and the second substrate 2, ultraviolet rays (UV) are irradiated and at the same time the first substrate 1 and the second substrate 2 A predetermined pressure is applied in the center direction between the layers. Since the adhesive 6 is in a liquid state before curing, the magnitude of the pressure applied to the first and second substrates 1 and 2 is relatively weak. In addition, pressure may be applied, and the curing agent 6 may expand in the vertical thickness direction instead of the width direction in the curing process, thereby causing a gap unevenness between the first substrate 1 and the second substrate 2. Such gap non-uniformity defects are observed on the screen of the liquid crystal panel as a result of poor display quality of the liquid crystal display device.

Accordingly, the present invention is to solve the problems of the prior art as described above, an object of the present invention is to provide a dam pattern in the area between the substrate fixing adhesive and the seal material to prevent the liquid crystal contamination by the adhesive and the first substrate and The present invention provides a method for manufacturing a liquid crystal display device in which gap unevenness between second substrates does not occur.

According to an aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, including: providing a first substrate and a second substrate on which a display area and a non-display area are defined; Forming a rod-shaped dam pattern bent at least once on a portion of the non-display area on the first substrate; Applying a seal material to a boundary between the display area and the non-display area on the first substrate; Applying an adhesive to a non-display area on the second substrate so as to correspond to a central area of an outer area of the area where the dam pattern of the first substrate is formed; The first substrate and the second substrate are positioned to face each other with the same thickness as the upper and lower thicknesses of the dam pattern, and the adhesive is cured by irradiating ultraviolet (UV) to the region where the adhesive is formed to add the first substrate and the second substrate. Kinding; Bonding heat to the first substrate and the second substrate to harden a seal material to bond the first substrate to the second substrate; It is made, including.

In the manufacturing method of the liquid crystal display device according to the preferred embodiment of the present invention as described above, the path to the display area is blocked by the dam pattern when the adhesive forming the liquid state is spread to the display area before curing. Since it does not flow, there is an effect that the liquid crystal contamination by the adhesive is prevented.

In the method for manufacturing a liquid crystal display device according to the preferred embodiment of the present invention as described above, a dam pattern formed between the substrate fixing adhesive and the seal member is particularly formed in the region between the first substrate and the second substrate. Since the gap is kept constant, it is possible to apply a relatively strong pressure to the first substrate and the second substrate during the curing of the adhesive, so that even if the adhesive volume increases during the curing of the adhesive, the width is not in the vertical thickness direction. Direction, the gap between the first substrate and the second substrate is kept constant even if the volume of the adhesive increases in the curing process of the adhesive.

Accordingly, the manufacturing method of the liquid crystal display device according to the present invention has an advantage of improving the screen quality of the liquid crystal display device.

Hereinafter, a liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2A to 2H, a method of manufacturing a liquid crystal display according to an exemplary embodiment of the present invention includes a first substrate 101 and a second in which a display area NA and a non-display area AA are defined. Providing a substrate 102; Forming a dam pattern (104) having a rod shape bent at least once in a portion of the non-display area (NA) on the first substrate (101); Applying a sealing material (105) to a boundary between the display area (AA) and the non-display area (NA) on the first substrate (101); Applying an adhesive (106) to the non-display area (NA) on the second substrate (102) so as to correspond to the central region of the outer region of the region where the dam pattern (104) of the first substrate (101) is formed; The first substrate 101 and the second substrate 102 are positioned to face each other with the same thickness as the upper and lower thicknesses of the dam pattern 106, and the adhesive is formed by irradiating ultraviolet (UV) to the region where the adhesive 106 is formed. Curing 106 to temporarily attach the first substrate 101 and the second substrate 102; Bonding heat to the first substrate 101 and the second substrate 102 to cure the seal member 106 to bond the first substrate 101 and the second substrate 102 to each other; It is made, including.

Hereinafter, a method of manufacturing a liquid crystal display according to an exemplary embodiment of the present invention including the above steps will be described in detail.

First, a first substrate (see 101 in FIG. 2A) and a second substrate (see 102 in FIG. 2C) in which the display area AA and the non-display area NA are defined are provided. Although not shown in detail in the drawing, a plurality of pixels (not shown) are defined on the first substrate and the second substrate, and a color filter (not shown) is formed on each pixel of the first substrate, A black matrix is formed, and a pixel electrode (not shown) is formed on each pixel of the second substrate, and a thin film transistor (not shown), which is a switching element, is formed. Here, the first substrate and the second substrate are mother glass for manufacturing a plurality of liquid crystal panels. That is, a plurality of display area NAs and non-display area NA groups for manufacturing a plurality of liquid crystal panels are defined in the first substrate and the second substrate.

Next, as shown in FIG. 2A, the column spacer 103 is formed in the display area AA on the first substrate 101 and the dam pattern 104 is formed in the non-display area NA. The column spacer 103 and the dam pattern 104 are simultaneously formed of the same material.

The column spacer 103 is to maintain the gap between the first substrate 101 and the second substrate 102 uniformly over the entire area, and is formed on a region in which a black matrix is formed. Various examples of the location are possible. In addition, the dam pattern 104 may be formed to have a bar shape that is bent at least once, and may be formed in an area adjacent to an edge of the seal member 105 to be applied on the second substrate 102 and other areas. When the dam pattern 104 is formed in an area adjacent to the edge of the seal member 105, the dam pattern 104 is formed in a bar shape that is bent once along the edge of the seal member 105, and the dam pattern 104 is formed of a seal member ( When formed in an area other than the area adjacent to the corner of 105, both ends are formed in a shape bent once in the outward direction of the first substrate 101.

In the description of a preferred embodiment of the present invention, the dam pattern 104 is formed of the same material as the column spacer 103 at the same time, but the present invention is not limited thereto. ) May be formed of the same material at the same time as the other components constituting the first substrate 101 or formed separately from other components, and various examples are possible within the scope of the present invention.

Subsequently, as shown in FIG. 2B, the sealing material 105 is coated on the boundary between the display area AA and the non-display area NA on the first substrate 101. Here, the seal member 105 is thermosetting.

At the time of applying the seal material 105, the liquid crystal injection hole 108 region to be used later during the liquid crystal injection operation is defined between the display area AA and the non-display area NA on the first substrate 101. Except apply.

Next, as illustrated in FIG. 2C, an adhesive 106 is applied to a portion of the non-display area NA on the second substrate 102. In this case, the adhesive 106 may be formed at a position where the adhesive 106 may correspond to the central region of the outer region of the region where the dam pattern 104 is formed during the bonding process of the first substrate 101 and the second substrate 102. It must be exactly right. Here, the adhesive 106 is ultraviolet (UV) curable, for example lactite (lactite).

The adhesive 106 is formed to correspond to the dam pattern 104 at a predetermined interval, and some of the adhesive 106 corresponding to the dam pattern 104 formed along the edge of the seal member 105 is the dam pattern 104. Some adhesive 106, which is located outside the bent point of the, and corresponding to the dam pattern 104 formed in the region other than the corner of the seal member 105 is in the internal space formed by the dam pattern 104 is bent twice Will be located.

In addition, although FIG. 2C illustrates that the adhesive 106 is formed in an area adjacent to the edge of the seal member 105 and an area opposite to the liquid crystal injection hole 108, the present invention is not limited thereto. ) May be formed only in an area adjacent to the edge of the seal member 105 or more than the example illustrated in FIG. 2C, and various examples may be made without departing from the spirit of the present invention. That is, the number and positions of the adhesives 106 may be various examples depending on the size of the liquid crystal panel to be manufactured using the first substrate 101 and the second substrate 102.

Subsequently, as shown in FIG. 2D, the first substrate 101 and the second substrate 102 are positioned to face each other, and then the first substrate 101 and the second substrate 102 are placed on the dam pattern 104. The plurality of pixels on the first substrate 101 and the plurality of pixels on the second substrate 102 are aligned so as to face each other at the same interval as the vertical thickness.

Then, as shown in FIG. 2E, the first substrate 101 and the second substrate 102 are added by curing the adhesive 106 by locally irradiating ultraviolet (UV) to the region where the adhesive 106 is formed. Good.

As such, when the adhesive 106 is hardened, the first substrate 101 and the second substrate 102 may be expanded so that the adhesive 106, which has a volume increase in the curing process, may expand in the width direction instead of the vertical thickness direction. A predetermined pressure is applied in the center direction between the first and second substrates 101, wherein the dam pattern 104 formed on the first substrate 101 is in particular in the region between the first substrate 101 and the second substrate 102. Is maintained at a constant interval, so that even if pressure is applied to the first substrate 101 and the second substrate 102, the problem that the liquid adhesive 106 spreads into the display area AA does not occur. Do not.

Subsequently, as shown in FIG. 2F, the first substrate 101 and the second substrate are formed by applying heat to the first substrate 101 and the second substrate 102 to cure the seal member 105 to form a seal pattern. The substrate 102 is bonded. As a method of curing the seal member 105 by applying heat as described above, the first substrate 101 and the second substrate 102 are temporarily bonded onto the hot plate 107 and then heat is applied. There are a variety of methods, such as applying or heat bonding the first substrate 101 and the second substrate 102 to the oven and then applying heat.

In this case, the first substrate 101 and the second substrate 102 have already been temporarily bonded by the curing of the adhesive 106 during the work of applying the heat to cure the seal member 105. ) And the second substrate 102 are not hardened, and the seal member 105 is hardened while being exactly aligned.

Subsequently, as shown in FIG. 2G, the operation of cutting the bonded first and second substrates 101 and 102 into individual substrates or unit substrates is performed.

Although FIG. 2G illustrates that the substrate is cut along the first cutting line CL1 during the cutting operation, that is, by one liquid crystal panel unit, the present invention is not limited thereto. Various examples will be possible within the range which does not deviate from the summary of this invention, such as cutting a liquid crystal panel as one unit. Of course, the first substrate 101 and the second substrate 102 bonded during the cutting operation are cut into individual substrates or unit substrates, but the liquid crystal injection hole 108 is formed of the first substrate 101 and the second substrate 102. It would be desirable to cut so that it could be exposed to the side in between.

Subsequently, liquid crystal is injected into the display area AA between the bonded first substrate 101 and the second substrate 102. The liquid crystal injection operation is performed through the liquid crystal injection hole 108 prepared at the time of applying the seal material 105.

Next, as shown in FIG. 2H, the region in which the adhesive 106 is formed among the regions of the bonded first substrate 101 and the second substrate 102 is cut and removed. That is, by cutting along the second cutting line CL2 shown in FIG. 2H, the region where the adhesive 106 is formed and the outer region of the region where the adhesive 106 is formed are removed. This completes the individual liquid crystal panel.

In the manufacturing method of the liquid crystal display device according to the preferred embodiment of the present invention as described above, as shown in region A of FIG. 3, the adhesive 106 forming the liquid state is spread out before being cured to form the display area AA. When facing, since the dam pattern 104 is blocked from proceeding to the display area AA, liquid crystal contamination by the adhesive 106 is blocked.

In addition, since the dam pattern 104 maintains a constant gap in the region between the first substrate 101 and the second substrate 102, particularly the region where the adhesive 106 is formed, the adhesive 106 is cured. It is possible to apply a relatively strong pressure to the first substrate 101 and the second substrate 102, so that even if the volume of the adhesive 106 is increased in the width direction rather than the vertical thickness direction of the adhesive 106, Even if the volume of the adhesive 106 increases in the curing process, the gap between the first substrate 101 and the second substrate 102 is kept constant.

1A to 1D are views illustrating a manufacturing process of a conventional general liquid crystal display device, and FIG. 1D is a cross-sectional view of a surface cut along the line II ′ of FIG. 1C.

2A to 2H are views illustrating a manufacturing process of a liquid crystal display device according to a preferred embodiment of the present invention. In particular, FIGS. 2E to 2H are views based on a plane cut along the line II-II ′ of FIG. 2D. Cross-section.

FIG. 3 is a top view of the bonded first substrate and the second substrate of FIG. 2E and is a plan view illustrating only the second substrate, the seal material, the column spacer, the dam pattern, and the adhesive for convenience of description.

** Description of the symbols for the main parts of the drawings **

101: first substrate 102: second substrate

AA: display area NA: non-display area

103: column spacer 104: dam pattern

105: seal material 106: adhesive

Claims (9)

Providing a first substrate and a second substrate on which a display area and a non-display area are defined; Forming a rod-shaped dam pattern bent at least once on a portion of the non-display area on the first substrate; Applying a seal material to a boundary between the display area and the non-display area on the first substrate; Applying an adhesive to a non-display area on the second substrate so as to correspond to a central area of an outer area of the area where the dam pattern of the first substrate is formed; The first substrate and the second substrate are positioned to face each other with the same thickness as the upper and lower thicknesses of the dam pattern, and the adhesive is cured by irradiating ultraviolet (UV) to the region where the adhesive is formed to add the first substrate and the second substrate. Kinding; Bonding heat to the first substrate and the second substrate to harden a seal material to bond the first substrate to the second substrate; Injecting a liquid crystal into a display area between the first and second substrates bonded to each other; Method of manufacturing a liquid crystal display device comprising a. The method of claim 1, wherein a plurality of pixels are defined in the first substrate and the second substrate. A color filter is formed in each pixel of the first substrate, and a black matrix is formed in the boundary region of the color filter. And a switching element is formed in each pixel of the second substrate. The method of claim 1, wherein a column spacer for maintaining a gap between the first substrate and the second substrate is formed on the first substrate, And wherein the dam pattern is formed of the same material at the same time as the column spacer. The method of claim 1, wherein the dam pattern is formed to be bent once along an edge region of the seal material, and the adhesive is located outside the bending point of the dam pattern. According to claim 1, wherein the dam pattern is formed along the seal material, both ends are formed in a shape bent once in the outward direction of the first substrate, the adhesive is located in the inner space formed by the dam pattern is bent twice. The manufacturing method of the liquid crystal display device made into. The method of claim 1, wherein the dam pattern has a vertical thickness equal to a distance between the first and second substrates bonded together. The method of claim 1, wherein the adhesive is lactite. The method of claim 1, wherein in the curing of the adhesive by applying ultraviolet (UV) light, a predetermined pressure is applied in an inner direction between the first substrate and the second substrate. And a pressure within a range in which a gap between the first substrate and the second substrate is maintained when the volume of the adhesive increases during the curing of the adhesive. The method of claim 1, wherein after injecting liquid crystal into the display area between the first substrate and the second substrate, And removing the region where the adhesive is formed by cutting the liquid crystal display device.

Images