KR20070046421A - Liquid crystal display panel and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a liquid crystal display panel. According to an aspect of the present invention, there is provided a liquid crystal display panel including an upper substrate and a lower substrate, the liquid crystal display comprising a sealant for adhering the upper substrate and the lower substrate at a periphery between the upper substrate and the lower substrate. A liquid crystal display panel comprising a first sealant and a second sealant spaced apart from a predetermined interval by a sealant. In addition, the present invention comprises the steps of preparing an upper substrate and a lower substrate; Forming a first sealant on the upper substrate or the lower substrate; It provides a method for manufacturing a liquid crystal display panel comprising the step of forming a second sealant spaced apart from the first sealant by a predetermined interval on the outside of the first sealant. As described above, the present invention forms a double UV curing sealant line and a thermosetting sealant line at the periphery of the upper substrate or the lower substrate to bond the upper substrate and the lower substrate of the liquid crystal display panel, thereby improving adhesion and moisture penetration. An improved liquid crystal display panel can be provided.

LCD, LCD, Sealant, Dropping, Ultraviolet

Description

Liquid crystal display panel and its manufacturing method {LIQUID CRYSTAL DISPLAY PANEL AND METHOD OF MANUFACTURING THE SAME}

1 is a schematic exploded perspective view of a liquid crystal display panel according to the prior art.

2 is a schematic exploded perspective view of a liquid crystal display panel according to the present invention;

3A is a perspective view for explaining an alignment film forming step of a manufacturing process of a liquid crystal display panel according to the present invention;

Figure 3b is a perspective view for explaining a rubbing process of the manufacturing process of the liquid crystal display panel according to the present invention.

3C is a perspective view illustrating a spacer forming step of a manufacturing process of a liquid crystal display panel according to the present invention.

3D is a perspective view illustrating a sealant forming step of a manufacturing process of a liquid crystal display panel according to the present invention.

3E is a perspective view illustrating a short forming process in a manufacturing process of a liquid crystal display panel according to the present invention;

Figure 3f is a perspective view for explaining a liquid crystal injection process of the manufacturing process of the liquid crystal display panel according to the present invention.

3G is a schematic perspective view of a liquid crystal display panel in which an upper substrate and a lower substrate are bonded during a manufacturing process of a liquid crystal display panel according to the present invention;

Figure 4 is a flow chart of the liquid crystal display panel manufacturing process according to the dropping method of the present invention.

5 is a flow chart of a liquid crystal display panel manufacturing process according to the vacuum injection method of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: thin film transistor substrate 120: first alignment layer

140: short 300a: first sealant

300b: second sealant 300: sealant

400: color filter substrate 420: second alignment layer

440: spacer 460: liquid crystal

The present invention relates to a liquid crystal display device, and more particularly, to a sealant structure of a liquid crystal display panel of a liquid crystal display device.

Liquid crystal display devices (LCDs) have advantages of small size, light weight, and large screen compared to conventional display devices, such as cathode ray tubes (CRTs). In particular, the liquid crystal display device has been developed to perform a sufficient role as a flat panel display device, and is used as a liquid crystal of a mobile phone, a personal digital assistant (PDA), a digital camera, a camcorder, and a monitor of a desktop computer. It is also used in large display devices, and its use range is rapidly expanding. In addition, in order to use a liquid crystal display as a general screen display device in various parts, it is a matter of how high quality images such as high definition, high brightness, and large area can be realized while maintaining the characteristics of light weight and low power consumption. Can be.

Such a liquid crystal display device includes a lower substrate and an upper substrate, and the two substrates are coupled to each other by encapsulating liquid crystal therebetween to form a liquid crystal display panel.

The lower substrate, a thin film transistor (TFT) substrate, is formed of a transparent glass material and has a plurality of gate lines arranged in one direction with a predetermined distance thereon, and a plurality of gate lines arranged at regular intervals in a direction perpendicular to the gate line. A plurality of pixel electrodes formed in a matrix form in a pixel region defined by intersection of the data line, the gate line and the data line, and a plurality of thin film transistors switched by the gate line signal to transfer the data line signal to each pixel electrode. Is formed.

The color filter substrate, which is an upper substrate, is made of transparent glass, and has a black matrix layer for blocking light except for the pixel region, an R, G, and B color filter layer for expressing color color, and an image for realizing an image. The common electrode is formed.

The upper substrate and the lower substrate of the liquid crystal display panel having the above components are bonded by a sealant.

In the case of manufacturing the liquid crystal display device having the above structure, instead of forming one liquid crystal display panel on one substrate, a plurality of liquid crystal panels are simultaneously formed on one large substrate according to the size of the substrate and the size of the liquid crystal panel. .

Looking at the exploded perspective view of the liquid crystal display panel according to the prior art shown in Figure 1, a sealant 1400 for bonding the upper substrate 1200 and the lower substrate 1000, the upper substrate 1200 and the lower substrate 1000 ).

As a method for injecting liquid crystal in the liquid crystal display panel as described above, there are a dropping method and a vacuum injection method.

Recently, as the size of the liquid crystal panel increases, a dropping method is used rather than a vacuum injection method. However, in the case of the dropping method, unlike the vacuum injection method, the upper substrate and the lower substrate are bonded to each other while the liquid crystal is doped onto the substrate. Therefore, in order to cure the sealant within a short time in order to prevent contamination of the liquid crystal and the sealant, an ultraviolet curing sealant is used instead of a conventional thermosetting sealant. However, UV sealants are more vulnerable than conventional thermosetting sealants in terms of adhesiveness and moisture penetration, and some thermosetting components are added to UV sealant components, but they still cause reliability problems in terms of adhesion and moisture penetration. Doing.

In order to solve the above problems, in order to bond the upper and lower substrates of the liquid crystal display panel, the present invention further improves in terms of adhesion and moisture permeation by forming a double UV curing sealant line and a thermosetting sealant line at the periphery of the substrate. It is an object to provide a liquid crystal display device.

In order to achieve the above object, the present invention, in the liquid crystal display panel including the upper substrate and the lower substrate, includes a sealant (Sealant) for adhering the upper substrate and the lower substrate in the peripheral portion between the upper substrate and the lower substrate, The sealant may include a first sealant and a second sealant spaced apart from the first sealant by a predetermined distance.

In this case, the first sealant is an ultraviolet curing sealant, and the second sealant is a thermal curing sealant. The first sealant may be formed inside the second sealant.

The upper substrate may be a color filter substrate, and the lower substrate may be a thin film transistor (TFT) substrate.

In addition, the present invention provides a liquid crystal display device comprising a liquid crystal display panel including the structure as described above, and a backlight unit for supplying light for displaying an image.

In addition, the present invention comprises the steps of preparing an upper substrate and a lower substrate; Forming a first sealant on the upper substrate or the lower substrate; Forming a second sealant on the outer side of the first sealant, the second sealant being spaced apart from the first sealant by a predetermined distance;

Applying a liquid crystal to the upper substrate or the lower substrate in a dropwise manner; And bonding the upper substrate and the lower substrate and curing the first sealant and the second sealant.

In this case, the first sealant and the second sealant have a closed curve shape.

However, the present invention is not limited thereto, and bonding the upper substrate and the lower substrate to each other; Curing the first sealant and the second sealant; A liquid crystal display panel manufacturing method further comprises a liquid crystal vacuum injection step of injecting a liquid crystal in a vacuum state between the bonded upper substrate and the lower substrate.

In this case, openings for injecting liquid crystal are formed in portions of the first sealant and the second sealant.

The first sealant may be an ultraviolet curing sealant and the second sealant may be a thermosetting sealant.

At this time, the first sealant is irradiated with ultraviolet rays, and the second sealant is cured by applying heat. The hardening of the first sealant and the second sealant cure the first sealant and the second sealant.

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

However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Like reference numerals in the drawings refer to like elements.

2 is an exploded perspective view of a liquid crystal display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the liquid crystal display panel according to the embodiment of the present invention bonds the upper substrate 400 and the lower substrate 100 on which a predetermined pattern is formed, and the upper substrate 400 and the lower substrate 100. Dual sealant 300 is included. In this case, each of the upper substrate 400 and the lower substrate 100 is divided into an active region in the center of the liquid crystal display panel displaying an image and an inactive region around the active region for applying an electrical signal to the image.

The lower substrate 100 is a thin film transistor (TFT) substrate, and is a transparent glass substrate in which the thin film transistor and the pixel electrode are formed in a matrix form. The lower substrate 100 includes a plurality of gate lines extending in one direction to form a liquid crystal panel, a plurality of data lines crossing the gate lines, a pixel electrode formed in a pixel region defined by the gate lines and the data lines, A pattern is formed that includes a thin film transistor connected to a gate line, a data line, and a pixel electrode, and a sustain electrode wiring having an extension portion formed in a portion of an edge of the pixel region and extending to the pixel region.

The upper substrate 400 is a color filter substrate in which red (R), green (G), and blue (B) pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process. The upper substrate 400 is provided with a pattern including a black matrix for forming a liquid crystal panel, a color filter, an overcoat film, and a common electrode.

In addition, the liquid crystal is aligned between the upper substrate 400 and the lower substrate 100, and a sealant 300 for fixing the upper substrate 400 and the lower substrate 100 is applied to an edge outside the active area. . The lower substrate 100 of the non-active area is formed with a pattern including a plurality of pads connected to the gate line or the data line of the active area. In addition, a separate driving circuit for transmitting a predetermined signal to the gate line and the data line may be formed. The sealant 300 is formed of a double seal line including a first sealant 300a line and a second sealant 300b line, and between the upper substrate 400 and the lower substrate 100. It acts as an adhesive to connect the substrate and as a waterproofing agent to prevent the ingress of external moisture.

The first sealant 300a is a photocurable, for example, ultraviolet (UV) curing sealant, and is cured in a solid state when ultraviolet rays are irradiated to the sealant in a gel state. Since the ultraviolet curing sealant is cured faster than the thermal curing sealant, there is an advantage in that the liquid crystal is prevented from external contamination during the liquid crystal cell process. However, the hygroscopicity is weak compared to the heat curing sealant in terms of external moisture penetration. In addition, the adhesive strength is also about 1/4 lower than that of the thermosetting sealant, making it difficult to firmly bond the upper substrate and the lower substrate.

The second sealant 300b is a heat curing sealant and is cured by heat in a gel state. The thermosetting sealant has good hygroscopicity and adhesiveness, but since the curing speed is slower than that of the ultraviolet curing sealant, the uncured component of the thermosetting sealant may diffuse into the liquid crystal to contaminate the liquid crystal.

Due to the characteristics of each sealant as described above, conventionally, two kinds of sealants are mixed to obtain respective advantages. That is, the liquid crystal cell process according to the prior art is formed in one row by mixing the two sealants in addition to forming one of the ultraviolet curing sealant or the thermal curing sealant in one row. That is, using a sealant in which the ultraviolet curing component and the thermosetting component are mixed, they are formed in one line, and then UV-cured firstly and thermally cured secondly. However, these mixed sealants have most of the disadvantages of the UV-cured sealant mixed in the heat-curing sealant, which is disadvantageous in terms of adhesiveness and hygroscopicity, and seals when the UV-curing conditions and the heat-curing conditions are not optimized. There is always the possibility that uncuring will occur and cause another failure.

Therefore, the structure proposed in the present invention is intended to overcome the above problems by using each of the ultraviolet curing sealant and the thermal curing sealant without mixing. That is, it is intended to improve the sealant characteristics of the dropping device by forming a double seal line having the ultraviolet curing seal line as the first sealant 300a line and the thermosetting seal line as the second sealant 300b line. When the double seal line is formed as described above, the first sealant 300a line therein is cured in a short time by ultraviolet irradiation, and the result is consistent with the purpose of the ultraviolet sealant which prevents external leakage and contamination of the liquid crystal. The sealant 300b line serves to increase resistance to external stress and moisture penetration by thermal curing. In addition, since the current sealant curing process is a first heat treatment after UV irradiation, there is an advantage that the double seal line can be applied to the process without significant change in the current process conditions.

Meanwhile, the liquid crystal display according to the present invention may arrange elements such as a polarizer, a backlight, and a compensation plate (not shown) on both sides of the basic panel.

When a voltage is applied to the liquid crystal display, the pixel electrode receives the pixel signal supplied from the thin film transistor to generate a potential difference with the common electrode formed on the common electrode substrate. Due to this potential difference, the liquid crystal positioned between the thin film transistor substrate and the common electrode substrate is rotated by dielectric anisotropy, and the amount of light incident through the pixel electrode from the light source (not shown) is controlled to be transmitted to the common electrode substrate.

Hereinafter, the manufacturing method of the liquid crystal display panel of the present embodiment having the above-described configuration will be described with reference to the drawings.

3A to 3G are perspective views illustrating a method of manufacturing a liquid crystal display panel according to the present invention.

Referring to FIG. 3A, first, a gate electrode, a gate insulating film, an active layer, an ohmic contact layer, a conductive film, an insulating film, and a pixel electrode are sequentially formed on a first glass plate to form a lower substrate. Next, a black matrix (not shown), a color filter, an overcoat film, and a transparent common electrode are sequentially formed on the second glass plate, thereby manufacturing a color filter substrate 400 which is an upper substrate.

Subsequently, in order to form the first alignment layer 120 and the second alignment layer 420 on each of the thin film transistor substrate 100 and the color filter substrate 400, the resin plates having the sizes of the two substrates 100 and 400 may be cylindrical rollers. 40 is used to prepare a resin plate 60 to which a polyimide mixed solution is applied using a cylindrical roller device which is mounted and rotated by supplying a polyimide (PI) mixed solution supplied from an upper dispenser. Each of the thin film transistor substrate 100 and the color filter substrate 400 is mounted on the moving stage 20, and aligned and contacted with the roller 40 on which the resin plate 60 is mounted. Thereafter, the thin film transistor substrate 100, the color filter substrate 400, and the resin plate 60 are passed at the same speed to transfer the pattern of the polyimide coated resin plate 60 to the two substrates 100. 400. Let's do it. As described above, the two substrates 100 and 400 coated with the first alignment layer 120 and the second alignment layer 420 are uniformly spread throughout the preliminary drying apparatus and the solvent is evaporated. The pre-dried substrate is cured using a curing furnace so that the first alignment layer 120 and the second alignment layer 420 including polyimide are formed.

Referring to FIG. 3B, liquid crystal molecules to be formed on the first alignment layer 120 and the second alignment layer 420 of the two substrates 100 and 400 may be aligned in a predetermined direction on the surface of the alignment layer. A rubbing process is performed in which the first alignment layer 120 and the second alignment layer 420 are rubbed in one direction using a soft cloth into which fibers are implanted. At this time, the rubbing direction of the first alignment layer 120 of the thin film transistor substrate 100 and the second alignment layer 420 of the color filter 400 substrate should be orthogonal to each other, and the six o'clock direction of the screen of the liquid crystal display panel. For optimal viewing angle characteristics, the thin film transistor substrate 100 is preferably rubbed in the upper left direction from the upper left direction, and the color filter substrate 400 is rubbed in the upper right direction in the lower left direction.

Referring to FIG. 3C, after performing the rubbing process, a wet method or air in which a spacer is mixed with a solvent and sprayed to maintain the thin film transistor substrate 100 and the color filter substrate 400 at a predetermined fixed interval. The spacer 440 is formed on the color filter substrate 400 using a dry method using nitrogen or the like. However, the present invention is not limited thereto, and the spacer 440 may be formed on the thin film transistor substrate 100. In addition, after the spacer 440 is formed, photolithography is performed at a predetermined position on the black matrix of a color filter (not shown) in which light is not transmitted at regular intervals by using a photolithography technique. A column space technology may be used to make the spacer 440 a constant density.

Referring to FIG. 3D, the two substrates 100 and 400 are adhered to the thin film transistor substrate 100 and the color filter substrate 400 manufactured as described above, and the liquid crystal is preserved between the two substrates. The sealant 300 is formed therebetween. The sealant 300 may be formed by a screen mask method or a method of forming a seal pattern having a desired shape using a removable sealant dispenser. However, in the present invention, the sealant dispenser method may be used. I will use it.

Therefore, the sealant 300 is formed in the form of a band on the edge outside the active region of the thin film transistor substrate 100 using the dispenser 80. In this case, the sealant 300 is preferably formed on the color filter substrate 400 when the spacer 440 is installed on the thin film transistor substrate 100. The sealant 300 is formed of a double line including a first sealant 300a line and a second sealant 300a line. That is, a double seal line is formed by using an ultraviolet curing sealant as a first sealant 300a line and a thermosetting sealant as a second sealant 300b line outside the first sealant 300a line. In this case, the first sealant 300a and the second sealant 300b may be formed at a predetermined interval so as not to be mixed with each other. On the other hand, when the liquid crystal injection process to be carried out after the vacuum injection method instead of the drop method, as shown in (b) of FIG. 3d to form a liquid crystal injection hole 320 in the side portion of the thin film transistor substrate 100.

Referring to FIG. 3E, a conductive silver paste or the like may be shorted using the dispenser 80 to make an electrical path connected to the sustain electrode of the color filter substrate 400 to apply a voltage to the sustain electrode. 140). That is, a voltage may be applied to the sustain electrode applying voltage terminal of the thin film transistor substrate 100 and the common electrode of the color filter substrate 400. In this case, the short 140 should be installed outside the seal pattern of the thin film transistor substrate 100 to protect the liquid crystal from contamination sources that may be included in the short 140 material. However, when the sealant 300 is formed on the color filter substrate and the spacer is formed on the thin film transistor substrate 100, the short 140 may be installed on the color filter substrate.

Referring to FIG. 3F, the liquid crystal 460 is dropped at regular intervals only by the amount necessary for the Curly filter substrate 400 in a dropping manner in a vacuum state. In this case, the liquid crystal 460 is formed without leaving the sealant internal space formed in the thin film transistor substrate. Meanwhile, the liquid crystal 460 injection may use a vacuum injection method instead of a dropping method. That is, as shown in (b) of FIG. 3E, the sealant 300 is formed, and after the alignment and adhesion processes of the thin film transistor substrate 100 and the color filter substrate 400 are performed, the two substrates 100 are processed. , 400 may be used, and a vacuum injection method may be used to accelerate the injection of the liquid crystal 140 by using a pressure difference between the inside and the outside of the two substrates 100 and 400. In this case, when the liquid crystal 460 injection method is used as described above, a process of blocking the liquid crystal injection hole 320 illustrated in (b) of FIG. 3E should be performed. The liquid crystal injection hole 320 is blocked using an ultraviolet curing sealant or a thermal curing sealant. However, it is preferable to use both the ultraviolet curing sealant and the thermal curing sealant to block the same shape as the first sealant 300a and the second sealant 300b.

Referring to FIG. 3G, the thin film transistor substrate 400 and the color filter substrate 100 are aligned and aligned. The two substrates having the aligned positions are solidified with ultraviolet rays, and the second sealant 300b is cured in a high temperature atmosphere to bond the thin film transistor substrate 100 and the color filter substrate 400 to each other. Of course, the present invention is not limited thereto, and after forming the liquid crystal layer, the two films may be aligned. In this case, the alignment error of the two substrates is determined by the overlapping degree of the black matrix and the sustain electrode, which are determined by the design of each substrate, and the substrate alignment error in the substrate assembly process is about 5 μm, which is typically a cell gap level. Required.

Thereafter, a polarizing plate (not shown) is attached to both sides of the liquid crystal display panel into which the liquid crystal is injected to complete the liquid crystal display panel.

Hereinafter, the overall process of the liquid crystal display panel as described above will be briefly described with reference to a flowchart.

4 is a flowchart of a liquid crystal display panel manufacturing process according to the dropping method. First, a color filter substrate is prepared as a lower substrate and a thin film transistor substrate as an upper substrate (S100 and S200). In this case, the lower substrate may be a color filter substrate, and the upper substrate may be a thin film transistor substrate. Thereafter, a culture film is formed on each of the lower substrate and the color filter substrate (S110 and S210), and fibers of cotton or nylon are planted so that the liquid crystal molecules to be formed on the culture film are arranged in a predetermined direction on the surface of the alignment film. A rubbing process is performed to rub the alignment layer of the lower substrate and the upper substrate in one direction using a soft cloth (S120, S220). After performing the rubbing process, a sealant is formed on the lower substrate (S130), and a spacer is formed on the upper substrate (S230). In this case, the sealant includes a first sealant and a second sealant, wherein the first sealant is an ultraviolet curing sealant and the second sealant is a thermal curing sealant. In addition, the first sealant is formed inside the second sealant. As described above, a short is installed at the periphery of the lower substrate on which the sealant is formed, that is, outside the sealant line (S140). In this case, when the short is installed on the upper substrate instead of the lower substrate, the spacer and the sealant may be formed on the lower substrate. Thereafter, the liquid crystal is applied to the upper substrate in a dropping manner (S240). However, the present invention is not limited thereto and the liquid crystal may be applied to the lower substrate. Next, the upper substrate and the lower substrate are aligned and bonded (S260), and the first sealant and the second sealant are cured (S270). At this time, the curing process is primarily irradiated with ultraviolet light to cure the first sealant, and heat is applied secondly to cure the second sealant. By performing the curing step, a liquid crystal display panel according to the dropping method is completed.

Next, a liquid crystal display panel manufacturing process according to a vacuum injection method will be described with reference to FIG. 5. Among the contents to be described below, the same contents as those of the dropping method described above will be briefly described.

Referring to the flowchart shown in FIG. 5, the upper substrate and the lower substrate are prepared as in the dropping method (S300 and S400), and the culture film forming process (S310 and S410) and the rubbing process (S320, and the like) for each substrate are performed. S420). Thereafter, a spacer is formed on the upper substrate (S430), and a sealant is formed on the lower substrate (S330). In this case, the sealant includes a first sealant that is an ultraviolet curing sealant and a second sealant that is a thermal curing sealant, as in a dropping method. In addition, unlike the dropping method, the sealant forms a liquid crystal injection hole by not applying a sealant to a portion of the lower substrate to inject liquid crystal. Next, a short is installed outside the sealant line of the lower substrate (S340), the upper substrate and the lower substrate are aligned and bonded (S450). Thereafter, ultraviolet light and heat are applied to the two bonded substrates to cure the first sealant and the second sealant. The liquid crystal is injected in a vacuum state between the two substrates bonded as described above (S470). In this case, the liquid crystal is injected through the liquid crystal inlet that is a portion where the sealant is not formed. After the liquid crystal injection process is finished, the liquid crystal display panel according to the vacuum injection method is completed by closing the liquid crystal injection hole.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and various changes and modifications can be made by those skilled in the art within the scope of the claims. It is self-evident.

As described above, the present invention can provide an improved liquid crystal display device in terms of adhesiveness and moisture penetration by forming a double UV curing sealant line and a thermosetting sealant line to bond upper and lower substrates of the liquid crystal display panel. .

Claims (14)

In a liquid crystal display panel comprising an upper substrate and a lower substrate, A sealant for adhering the upper substrate and the lower substrate at a peripheral portion between the upper substrate and the lower substrate, And the sealant comprises a first sealant and a second sealant spaced apart from the first sealant by a predetermined distance. The method according to claim 1, Wherein the first sealant is an ultraviolet curing sealant, and the second sealant is a thermosetting sealant. The method according to claim 1 or 2, And the first sealant is formed inside the second sealant. The method according to claim 1, And the upper substrate includes a color filter substrate. The method according to claim 1, The lower substrate includes a thin film transistor (TFT) substrate. Preparing an upper substrate and a lower substrate; Forming a first sealant on the upper substrate or the lower substrate; And forming a second sealant spaced apart from the first sealant by a predetermined distance on an outer side of the first sealant. The method according to claim 6, Applying a liquid crystal to the upper substrate or the lower substrate in a dropwise manner; Bonding the upper substrate and the lower substrate to each other; and The method of claim 1, further comprising curing the first sealant and the second sealant. The method according to claim 7, The first sealant and the second sealant have a closed curve shape. The method according to claim 6, Bonding the upper substrate and the lower substrate to each other; Curing the first sealant and the second sealant; And a liquid crystal vacuum injection step of injecting a liquid crystal into a vacuum state between the bonded upper substrate and the lower substrate. The method according to claim 9, And an opening is formed in a portion of the first sealant and the second sealant. The method according to any one of claims 6 to 10, And said first sealant is an ultraviolet curing sealant. The method according to any one of claims 6 to 10, And the second sealant is a thermosetting sealant. The method according to any one of claims 6 to 10, Wherein the first sealant is irradiated with ultraviolet rays and the second sealant is cured by applying heat. The method according to any one of claims 6 to 10, And first curing the first sealant and then curing the second sealant.

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