KR20080000246A - Transfer film liquid crystal display device fabricated using the same and fabricating method for the liquid crystal display device - Google Patents

Abstract

A transfer film, an LCD fabricated using the same, and a fabrication method thereof are provided to improve productivity by forming an alignment layer through a transfer process using a transfer film. A first transfer layer(110) is formed on a base layer(100) and is transferred to a transferred substrate. A second transfer layer(120) is formed on the first transfer layer, and is transferred to the transferred substrate simultaneously with the first transfer layer to improve adhesiveness between the first transfer layer and the transferred substrate. The second transfer layer has adhesiveness and viscosity with respect to the transferred substrate.

Description

Transfer film, liquid crystal display device manufactured using the same and method for manufacturing the same {Transfer film, liquid crystal display device fabricated using the same, and fabricating method for the liquid crystal display device}

1A and 1B illustrate a step of forming an alignment film using a printing plate.

2 is a cross-sectional view of the transfer film according to the first embodiment of the present invention.

3A to 3D are flowcharts illustrating a method of manufacturing a liquid crystal display device using a transfer film according to an exemplary embodiment of the present invention.

4 is a cross-sectional view of a liquid crystal display device manufactured using a transfer film according to an exemplary embodiment of the present invention.

 (Explanation of symbols for the main parts of the drawing)

 100: base material layer 110: first transfer layer

 120: second transfer layer 130: protective film

 200: transfer substrate 300: first substrate

 400: second substrate 500: sealant

 600: liquid crystal layer

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device manufactured using a transfer process.

Today, the liquid crystal display of the flat panel display device is not only capable of light weight and thinness, but also has been spotlighted as a next-generation display device having low power consumption, good portability, high technology value, and high added value.

The liquid crystal display device is formed through a process of forming a first substrate on which a thin film transistor and a second substrate on which a color filter is formed, and forming a liquid crystal layer between the first substrate and the second substrate, respectively.

Here, the step of forming an alignment film for setting the initial alignment of the liquid crystal on at least one of the first substrate or the second substrate is further added.

The alignment layer may be formed using a printing technique using a printing plate.

1A and 1B illustrate a step of forming an alignment film using a printing plate.

Referring to FIG. 1A, a substrate 10 on which an alignment layer is to be formed is provided. The printing plate 20 to which the alignment film 21 is coated is provided on the substrate 10. The alignment film 21 formed on the printing plate 20 is transferred to the substrate 10. Here, in order to transfer the alignment film 21 formed on the printing plate 20 to the substrate 10, the printing plate 20 is applied with a predetermined pressure. At this time, the alignment film 21 formed on the printing plate 20 has a ductility, and mounts convex at the edge portion of the printing plate 20 by applying a predetermined pressure to the printing plate 20. Occurs.

Referring to FIG. 1B, after the printing plate 20 is removed, an alignment layer 21 is formed on the substrate 10 through a curing process. At this time, as described above, the mount M is generated at the edge portion of the alignment layer 21, so that the alignment layer is not uniformly formed.

In addition, after forming a plurality of cells on a large substrate today, by cutting the cells to form several at the same time, to improve the productivity. In recent years, the substrate has become increasingly large. Accordingly, the printing plate must also be enlarged, but there is a limit in manufacturing a large printing plate. As a result, the large printing plate is formed by fabricating a plurality of small printing plates and then bonding the small printing plates.

At this time, when the alignment film is formed by using a large printing plate manufactured by bonding at least two small printing plates, the alignment film is unevenly formed at the bonding portion. As a result, a cell must be designed on the large substrate, avoiding the junction of the printing plate, and thus the gap margin between cells is reduced on the large substrate, making it difficult to use the large substrate efficiently.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transfer film used in a transfer process capable of forming a uniform alignment film and efficiently forming an alignment film on a large substrate.

In addition, another object of the present invention is to provide a liquid crystal display device manufactured using the transfer film and a method of manufacturing the same.

In order to achieve the above technical problem, an aspect of the present invention provides a transfer film. The transfer film is a base layer; A first transfer layer formed on the substrate layer and transferred to the transfer substrate; And a second transfer layer formed on the first transfer layer and transferred simultaneously with the first transfer layer to the transfer substrate to improve adhesion between the first transfer layer and the transfer substrate.

In order to achieve the above technical problem, another aspect of the present invention provides a liquid crystal display device. The liquid crystal display device includes a substrate; An alignment film formed on the substrate; And an adhesive layer disposed under the alignment layer and adhering the substrate and the alignment layer.

 The liquid crystal display may further include a thin film transistor formed on the substrate and a pixel electrode electrically connected to the thin film transistor.

Alternatively, the liquid crystal display may further include a color filter formed on the substrate, an overcoat layer formed on the color filter, and a common electrode formed on the overcoat layer.

Another aspect of the present invention to achieve the above technical problem provides a method of manufacturing a liquid crystal display device. The manufacturing method includes providing a substrate; Laminating a transfer film onto the substrate; And transferring the transfer layer of the transfer film onto the substrate to form an alignment layer.

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The following embodiments are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the invention is not limited to the embodiments described below and may be embodied in other forms. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like numbers refer to like elements throughout.

2 is a cross-sectional view of the transfer film according to an embodiment of the present invention.

Referring to FIG. 2, the substrate layer 100 is located. Here, the base layer 100 may be formed of a material having transparency and excellent light transmittance. For example, the base layer 100 may be formed of at least one selected from the group consisting of glass, polyester, polymethyl methacrylate, polyethylene, polyethylene terephthalate, polycarbonate, polyurethane, and polyacryl.

The first transfer layer 110 is formed on the substrate layer 100. The first transfer layer 110 is formed of a material to be transferred to the transfer substrate. That is, the first transfer layer 110 may be formed of a material for forming an alignment layer. Here, the forming material of the alignment layer may be a polyimide resin. In addition, the first transfer layer 110 may be formed of an organic pattern forming material constituting the liquid crystal display. The organic pattern may be formed of any one of a color filter and an overcoat layer.

The second transfer layer 120 is formed on the first transfer layer 110. The second transfer layer 120 has adhesion to the substrate to be transferred, thereby improving adhesion between the transfer film and the substrate to be transferred. As a result, during the transfer process using the transfer film, it is possible to prevent the transfer film from moving to lower transfer characteristics.

In this case, the second transfer layer 120 reacts with light and has adhesiveness. Thus, when light is irradiated to a portion of the region by the second transfer layer 120, the first transfer layer 110 corresponding to the lower portion of the second transfer layer 120 to which the light is irradiated is transferred to the transfer substrate. do.

Alternatively, the second transfer layer 120 may have adhesiveness to the substrate to be transferred, and may react with light to reduce adhesiveness. Thus, when light is irradiated to a portion of the region by the second transfer layer 120, the first transfer layer 110 corresponding to the lower portion of the second transfer layer 120 where the light is not irradiated is transferred to the transfer substrate. Is transferred.

The second transfer layer 120 may be formed of at least one selected from the group consisting of an epoxy resin, an acrylic resin, a urethane resin, and an imide resin.

That is, the second transfer layer 120 plays an important role in transferring the first transfer layer 110 to the transfer substrate.

Furthermore, the protective film 130 formed on the second transfer layer 120 may be further included. The protective film 130 prevents the second transfer layer 120 from being contaminated. The protective film 130 is detached before performing the transfer process using the transfer film. That is, the protective film 130 is attached to the second transfer layer 120, it can be easily attached and detached.

In addition, a release layer (not shown) may be further included between the base layer 100 and the first transfer layer 110. Here, the release layer serves to facilitate separation of the base layer 100 and the first transfer layer 120 during the transfer process. The release layer has an adhesive property in response to light, or the adhesive property is lowered. Here, the release layer may be formed of at least one selected from the group consisting of an epoxy resin, an acrylic resin, a urethane resin, and an imide resin.

In this case, the release layer is formed to have characteristics opposite to those of the second transfer layer 120. That is, when the adhesiveness of the second transfer layer 120 is increased by light, the release layer has a property of decreasing adhesiveness by light. On the contrary, when the adhesiveness is lowered by light of the second transfer layer 120, the release layer has a property of increasing adhesiveness by light. As a result, the second transfer layer and the first transfer layer are easily transferred to the transfer substrate by the release layer.

3A to 3D are flowcharts illustrating a method of manufacturing a liquid crystal display device using a transfer film according to an exemplary embodiment of the present invention.

Referring to FIG. 3A, a transfer film T is provided. The transfer film T may be wound around the roll 140, and may have a flat substrate shape unlike the drawing.

As described above, the transfer film T is formed of the base layer 100, the first transfer layer 110 formed on the base layer 100, and transferred to the transfer substrate, and the first transfer layer. A second transfer layer formed on the 110 and simultaneously transferred to the transfer substrate with the first transfer layer 110 to improve adhesion between the first transfer layer 110 and the transfer substrate 200. 120.

The substrate layer 100 may be transparent plastic or glass having good light transmittance. The first transfer layer 110 is formed of an alignment layer forming material formed of a polyimide resin. In addition, the second transfer layer 120 may be formed of a material that reacts with light to have adhesiveness or that adhesion decreases. In this case, the second transfer layer 120 may be formed of at least one selected from the group consisting of an epoxy resin, an acrylic resin, a urethane resin, and an imide resin.

The transfer film T may further include a protective film 130 positioned on the second transfer layer 120 to prevent the second transfer layer 120 from being contaminated. In addition, a release layer (not illustrated) may be further included between the base layer 100 and the first transfer layer 110 to improve transfer characteristics of the first transfer layer 110. have.

As shown in FIG. 3B, the transfer film T is wound with the roll 140 and the transfer substrate 200 as a lamination device. The transfer substrate may include a thin film transistor and a pixel electrode electrically connected to the thin film transistor. Alternatively, a color filter, an overcoat layer formed on the color filter, and a common electrode may be formed on the transfer substrate.

Here, after removing the protective film 130 of the transfer film (T), the transfer film (T) and the transfer substrate 200 is laminated.

Referring to FIG. 3C, after laminating the transfer film T to the transfer substrate 200, a mask M is provided on the transfer film T. Then, light is provided onto the mask M. As a result, the pattern of the mask M is projected onto the transfer film T. In this case, the second transfer layer 120 of the transfer film T reacts with light to have an adhesive force to the transfer substrate 200. Unlike the drawing, the second transfer layer 120 may react with light to decrease the adhesive strength with the transfer substrate 200.

Referring to FIG. 3D, the transfer film T is separated from the transfer substrate 200. In this case, the second transfer layer 120 of the region to which the light is irradiated is formed with an adhesive force to the transfer substrate 200, so that the second transfer layer 120 of the region to which the light is irradiated is formed on the upper portion of the second transfer layer 120. The first transfer layer 110 positioned is transferred to the transfer substrate 200, and an adhesive layer 120 ′ and an alignment layer 110 ′ are formed on the transfer substrate 200. That is, the adhesive layer 120 ′ is a portion of the second transfer layer 120 of the transfer film T transferred, and the alignment layer 110 ′ is the first transfer layer 110 of the transfer film T. Is part of).

Here, the transfer substrate 200 may be a large substrate. In this case, even if the transfer substrate 200 is a large substrate, an alignment layer may be easily formed through a transfer process using the transfer film without requiring a large printed substrate. That is, the transfer process is subjected to an exposure process using a mask having a predetermined size on the transfer film, the transfer film is a wet process that is easy to process, such as spray coating method, dip coating method, doctor blade method, T- It can be produced through a die coating method. In addition, since the mask is subjected to an exposure process by shifting the laminated irradiated substrate and the transfer film image several times, there is no need to manufacture a separate large size mask. Thus, when a plurality of printing plates are conventionally bonded to form an alignment film on a large substrate, the cells may be designed in consideration of the cell efficiency of the large substrate first, without having to design the cells of the large substrate by avoiding the junction of the printing plates. Can be. That is, by forming the alignment layer through the transfer process using the transfer film, not only can the alignment layer be uniformly formed, but also the efficiency of the large substrate can be improved, and the productivity can be improved.

Here, although forming the alignment layer through the transfer film is described as an embodiment, the present invention is not limited thereto, and at least one of the color filter and the overcoat layer may be formed through the transfer process.

4 is a cross-sectional view of a liquid crystal display device manufactured using a transfer film according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the first substrate 300 and the second substrate 400 are disposed to face each other with a predetermined interval therebetween. Here, the first substrate 300 and the second substrate 400 are bonded to each other by the sealant 500, and the liquid crystal layer 600 between the first substrate 300 and the second substrate 400. ) Is formed.

Gate wirings (not shown) and data wirings (not shown) are formed on the first substrate 300 so as to cross each other and define pixels. A gate insulating layer 310 is formed between the gate line and the data line.

In addition, at least one thin film transistor Tr is formed in an intersection region of the gate line and the data line. The thin film transistor Tr may include a gate electrode 301 branched from the gate line, a semiconductor layer 311 and the semiconductor layer 311 on the gate insulating layer 310 corresponding to the gate electrode 301. Source / drain electrodes 312 and 313, each positioned separately on both ends of the < RTI ID = 0.0 >

The passivation layer 320 is formed on the gate insulating layer 310 including the thin film transistor Tr. The passivation layer 320 is formed with a contact hole partially exposing the drain electrode 313, and a pixel electrode 321 electrically connected to the thin film transistor through the contact hole is formed on the passivation layer 320. have.

An alignment layer 340 is formed on the pixel electrode 321 for initial alignment of the liquid crystal. An adhesive layer 330 is formed under the alignment layer 340 to improve adhesion between the alignment layer 340 and the protective layer 320 including the pixel electrode 321. Here, when the alignment layer 340 is formed using a transfer film, a first transfer layer made of a material for forming the alignment layer 340 included in the transfer film, and a first transfer layer formed on the first transfer layer, the adhesive layer Since the second transfer layer made of the material of 330 is transferred to the passivation layer 320 including the pixel electrode 321, the adhesive layer 330 is positioned under the alignment layer 340.

The alignment layer 340 may be formed of polyimide resin. In addition, the adhesive layer 330 may be formed of at least one selected from the group consisting of an epoxy resin, an acrylic resin, a urethane resin, and an imide resin.

The black matrix 411 is formed in a region corresponding to the blocking region of the second substrate 400. The blocking region may be a region corresponding to a wiring formation region and a thin film transistor Tr on the first substrate 300.

The color filter 412 is formed in a region corresponding to the transmission region of the second substrate 400. The transmission region may be a region corresponding to a pixel region defined by crossing gate lines and data lines formed on the first substrate 300. Here, the color pill 412 may be partially overlapped with the black matrix 411.

An overcoat layer 420 may be further formed to overcome the step between the black matrix 411 and the color filter 412.

The common electrode 430 is formed on the overcoat layer 420, and an alignment layer 450 for initial alignment of the liquid crystal may be further formed on the common electrode 430.

When the alignment layer 450 is formed using the transfer film described above, an adhesive layer 440 may be further formed between the common electrode 430 and the alignment layer 450.

In addition, at least one of the color filter 412 or the overcoat layer 420 may be formed using the above-described transfer film, and at least one of the color filter 412 and the overcoat layer 420 layer. An adhesive layer 440 may be formed on the lower portion.

As described above, according to the present invention, productivity can be improved by forming an alignment layer through a transfer process through a transfer film.

In addition, through the transfer process using the transfer film, in forming the alignment film on the large substrate, the alignment film may be uniformly formed, and the efficiency of the large substrate may be improved.

In addition, the transfer process using the transfer film may be applied to other components besides the alignment layer of the liquid crystal display, that is, the color filter or the overcoat layer, thereby further improving productivity.

Although described above with reference to embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims below. You will understand.

Claims (19)

Base layer; A first transfer layer formed on the substrate layer and transferred to the transfer substrate; And A second transfer layer formed on the first transfer layer, the second transfer layer being transferred to the transfer substrate simultaneously with the first transfer layer to improve adhesion between the first transfer layer and the transfer substrate. Transfer film. The method of claim 1, The second transfer layer is transfer film, characterized in that the adhesive or adhesive to the transfer substrate. The method of claim 1, The second transfer layer is a transfer film, characterized in that the reaction by the light having adhesiveness or adhesiveness is lowered. The method of claim 1, The second transfer layer is a transfer film, characterized in that formed with at least one selected from the group consisting of epoxy resins, acrylic resins, urethane resins and imide resins. The method of claim 1, And the first transfer layer is formed of a material for forming any one of an alignment layer, a color filter, and an overcoating layer constituting the liquid crystal display. The method of claim 1, The base layer is a transfer film, characterized in that formed of at least one selected from the group consisting of polyester, polymethyl methacrylate, polyethylene, polyethylene terephthalate, polycarbonate, polyurethane and polyacryl. The method of claim 1, The transfer film is adhered to the second transfer layer, further comprising a protective film to protect the second transfer layer. The method of claim 1, And a release layer interposed between the base layer and the first transfer layer to assist separation of the base layer and the first transfer layer. The method of claim 8, The release layer is a transfer film, characterized in that the adhesive force is increased or decreased by reaction with light. Board; An alignment film formed on the substrate; And And an adhesive layer disposed under the alignment layer and adhering the substrate to the alignment layer. The method of claim 10, And a pixel electrode formed on the substrate, and a pixel electrode electrically connected to the thin film transistor. The method of claim 10, And a common electrode formed on the color filter formed on the substrate, an overcoat layer formed on the color filter, and the overcoat layer. The method of claim 12, And an adhesive layer under the at least one of the color filter and the overcoat layer. Providing a substrate; A substrate layer formed on the substrate, a first transfer layer formed on the substrate layer, and transferred onto the substrate, formed on the first transfer layer, and simultaneously transferred to the substrate with the first transfer layer; Laminating a transfer film including a second transfer layer to improve adhesion between the transfer layer and the substrate; And And providing light to the transfer film to transfer the first transfer layer and the second transfer layer onto the substrate. The method of claim 14, And the first transfer layer is a material for forming an alignment layer. The method of claim 14, And the second transfer layer increases or decreases adhesion to the substrate in response to light. The method of claim 15, And forming a thin film transistor and a pixel electrode electrically connected to the thin film transistor on the substrate. The method of claim 15, And forming a color filter on the substrate, an overcoat layer formed on the color filter, and a common electrode formed on the overcoat layer. The method of claim 14, And the first transfer layer is formed of the color filter or the overcoat layer.

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