KR20080002314A - Adhesive substrate and fabricating for the flexible display device method using the same - Google Patents

Abstract

An adhesive conveyance substrate and a flexible display manufacturing method using the same are provided to prevent chemical liquid from penetrating a surface area between an adhesive and a flexible substrate by changing a shape of an edge area of the flexible substrate and the adhesive, thereby preventing the flexible substrate from detached from the adhesive. An adhesive conveyance substrate comprises a base substrate(20), a flexible substrate(10) and an adhesive(30). The flexible substrate is formed on the base substrate, and formed in a shape of reducing a surface area of an edge area. The adhesive adheres the flexible substrate on the base substrate, and is formed in a shape of reducing a surface area of an edge area. The shapes of the edge(a) of the flexible substrate and the adhesive are formed in a rounded shape.

Description

Adhesive substrate and fabrication method for flexible display device using the same {adhesive substrate and fabricating for the flexible display device method using the same}

Figure 1a is a plan view showing a conventional adhesive transfer substrate.

FIG. 1B is an enlarged perspective view of region A ′ of FIG. 1A.

FIG. 2A is a view showing surface areas of edge regions and edge regions exposed to the outside (chemical liquid) by dividing sectors by the virtual unit length of FIG. 1B; FIG.

Figure 2b is a plan view showing a phenomenon in which the chemical liquid is in contact with the conventional adhesive transfer substrate.

3A is a cross-sectional view taken along line II ′ and II-II ′ of FIG. 2B;

Figure 3b is a plan view of a pressure-sensitive adhesive transfer substrate having a conventional detachment failure.

Figure 4a is a plan view showing a pressure-sensitive adhesive transfer substrate according to the present invention.

4B is an enlarged perspective view of region A of FIG. 4A.

Figure 4c is a view showing the surface area according to the unit length of the corner area according to the present invention.

Figure 5a is a plan view showing a chemical liquid in contact with the adhesive carrier substrate according to the present invention.

FIG. 5B is a sectional view taken along line III-III ′ of FIG. 5A;

6a and 6b show another embodiment of the shape of the corner region according to the present invention.

7A to 7E schematically illustrate a method of manufacturing an adhesive carrier substrate and a method of manufacturing a flexible display device using the adhesive carrier substrate according to the present invention.

<Description of the reference numerals for the main parts of the drawings>

  1: Adhesive Carrying Board 10: Flexible Board

 20: substrate substrate 30: adhesive

100: chemical

The present invention relates to a pressure-sensitive adhesive substrate for manufacturing a flexible display device and a method of manufacturing a flexible display device using the same.

In the modern information society, the image industry demands large-sized flattening and displays with various functions. In addition, there is a demand for freely recording and exchanging information at any time, requiring a portable and lightweight display.

The glass substrate used in the conventional flat panel display is formed to a predetermined thickness and has a disadvantage of being fragile due to the nature of the glass. Thus, when applied to a mobile display or a large display, an additional protective window is required. In addition, glass substrates have a disadvantage of being difficult to bend.

Therefore, the flexible substrate, which overcomes the disadvantages of the glass substrate, is difficult to bend and has a bending characteristic. Accordingly, the development of a technology for a flexible flexible display device which is ultra-light and easy to carry with a substrate having the above characteristics is in progress.

In order to implement the flexible display device, a flexible substrate such as plastic or metal foil is used. However, the flexible substrate may be difficult to satisfy suitability for the existing process because of flexibility, which is different from that of the hard shape glass substrate of the existing display.

That is, the flexible characteristic is because it may be difficult to align the pattern to form a pattern (a thin film transistor having a laminated structure, a plurality of lines, etc.) on the flexible substrate.

Therefore, a conveying technique for adhering the flexible substrate to a hard shape such as a glass substrate and carrying out a process and the like has been proposed.

1A is a plan view illustrating a conventional adhesive transfer substrate, and FIG. 1B is an enlarged perspective view of region A ′ of FIG. 1A.

As illustrated in FIGS. 1A and 1B, the adhesive transport substrate 501 may be formed by providing an adhesive 530 on a substrate substrate 520 and adhering the flexible substrate 510 to the adhesive 530. .

The base substrate 520 is formed in a hard shape such as a glass substrate. The substrate 520 may have difficulty in carrying and carrying out the process using only the flexible substrate 510 due to the flexible characteristics of the flexible substrate 510.

Thus, the flexible substrate 510 is adhered to the substrate substrate 520 to maintain the shape of the flexible substrate 510. Accordingly, the ease of conveyance of the flexible substrate 510 and the safety of the process can be ensured.

The adhesive 530 is formed between the base substrate 520 and the flexible substrate 510. The adhesive 530 serves as an intermediate material capable of adhering the flexible substrate 510 to the substrate substrate 520 while being adhered to the substrate substrate 520. That is, the pressure-sensitive adhesive 530 can maintain the shape of the flexible substrate 510 along the flat plate shape of the base substrate 520.

The flexible substrate 510 is a flexible substrate. A plurality of patterns and the like may be formed on the flexible substrate 510. The flexible substrate 510 may be detached from the substrate 520 later and form a flexible display device through other processes.

As such, the flexible substrate 510 may be adhered to the substrate substrate 520 to form an adhesive transport substrate 501. By using the adhesive transfer substrate 501, the flexible substrate 510 may be transported, cleaned, and patterned. In the plurality of processes, a plurality of chemical liquids are used.

Referring to FIG. 1B, the flexible substrate 510 and the pressure-sensitive adhesive 530 are equally divided into virtual length unit lengths L 'and defined as edge regions b' and edge regions a '. . That is, the rectangular flexible substrate 510 and the adhesive 530 are formed of four side regions b ', and a region where the two sides are joined is divided into a corner region a'.

Here, the flexible substrate 510 and the pressure-sensitive adhesive 530 are provided in a shape having a predetermined thickness in a rectangular shape. Therefore, the thickness surface of the flexure substrate 510 and the pressure-sensitive adhesive 530 may be an area exposed to the outside, that is, the chemical liquid.

FIG. 2A is a view showing surface areas of edge regions and edge regions exposed to the outside (chemical liquid) by dividing sectors by virtual unit lengths of FIG. 1B, and FIG. 2B illustrates a phenomenon in which chemical liquid contacts a conventional adhesive carrier substrate. One floor plan. 1B, the surface area obtained by dividing the side area a 'and the edge area b' by the unit length L 'is illustrated.

As shown in FIG. 2A, a flexible substrate 510 is adhered to the adhesive transfer substrate 501 by an adhesive 530 which is an intermediate material on the substrate substrate 520.

Here, the side surfaces of the pressure-sensitive adhesive 530 and the substrate substrate 520 formed on the pressure-sensitive adhesive substrate 501 may be divided into four side regions b 'and an area where the side regions b' are joined together. It is divided into a corner area a '.

Therefore, the thickness surface of the side region b 'corresponds to one side of an area exposed to the outside (chemical solution). In the corner region a ', since the two sides are joined together, the thickness faces in two directions may be exposed to the outside (chemical solution).

That is, the edge area b 'corresponds to a surface area where the surface area having a unit length L' formed at one side along the thickness surfaces of the flexible substrate 510 and the pressure-sensitive adhesive 530 is exposed to the chemical liquid 600. . In addition, the corner area a 'has a surface area corresponding to two unit lengths 2L' because the unit length L 'for exposing the adhesive 530 and the flexible substrate 510 is two directions.

Therefore, the edge area a 'has a higher surface area than the edge area b'. In other words, the edge area b 'corresponds to a thickness side of one side while the area exposed to the outside (chemical solution) corresponds to the thickness side of the two sides. This results in a high exposure surface area.

Like the chemical liquid in contact with the adhesive carrier substrate illustrated in FIG. 2B, the chemical liquid provided in a plurality of processes may be in contact with the adhesive carrier substrate 501 at the side of the adhesive carrier substrate 501. have.

The adhesive transport substrate 501 is produced to perform various processes such as a washing process of washing the flexible substrate 510 provided on the substrate substrate 520, a process of forming a pattern, etc. on the flexible substrate 510. The flexible substrate 510 can be conveyed to system equipment or the like.

In this case, the cleaning process, the pattern forming process, and the like use a plurality of chemical liquids 600. For example, in order to form a pattern on the flexible substrate 510, a metal film may be formed, and in order to form a pattern of the metal film, a photosensitive film may be coated and exposed to form a photosensitive pattern. The metal film is etched. As a result, the metal film may have a predetermined shape.

In the process of forming the pattern, a chemical liquid for removing the photosensitive film, an etching liquid for viewing the metal film, and a chemical liquid for removing the photosensitive pattern may be used.

However, since the chemical liquid 600 is a liquid phase, the chemical liquid 600 has high internal energy, which is a liquid property and a liquid characteristic.

The chemical liquid 600 tends to be stabilized by lowering energy of liquid molecules on the surface of the chemical liquid 600 because of the characteristics of the liquid. For this reason, the chemical liquid 600 tries to contact the surface of the flexible substrate 510.

In this case, an adhesive 530, which is an intermediate material provided to adhere the flexible substrate 510, is provided on the substrate 520. Therefore, the pressure-sensitive adhesive 530 may also be exposed to the chemical liquid 600.

In addition, since the chemical liquid 600 is a liquid having fluidity, the chemical liquid 600 tends to be stabilized by lowering surface free energy (surface energy) by contacting a thickness surface of the side of the flexible substrate 510.

Therefore, due to the high surface area of the corner region a ', the amount of contact of the chemical liquid 600 to the corner region may increase. In other words, since the edge region a 'exposed to the chemical liquid 600 has a larger surface area than the side region b', the chemical liquid 600, which is a liquid, contacts the edge region a 'to lower surface energy. The amount will increase.

FIG. 3A is a cross-sectional view taken along line II ′ and II-II ′ of FIG. 2B, and FIG. 3B is a plan view of a pressure-sensitive adhesive carrier substrate having a conventional detachment defect. 3A is a cross-sectional view showing the contact amount of the chemical liquid 600 according to the surface area of the edge region b 'and the edge region a'.

As shown in the cross-sectional view taken along line II ′ of FIG. 3A, the flexible substrate 510 and the adhesive (area) are formed on the surface of the side length (b ') as one side thereof is exposed to the unit length (L ′). 530 may be exposed to the chemical liquid 600.

The surface area has a surface energy corresponding to the corresponding area. Here, since the chemical liquid 600 is a liquid, molecules on the liquid surface attempt to contact an external surface to lower energy.

Therefore, molecules on the liquid surface tend to lower energy by contacting the surface energy corresponding to the surface area. So it tries to stabilize thermodynamically.

Meanwhile, as shown in the cross-sectional view taken along line II-II 'of FIG. 3A, a cross-sectional view showing the amount of contact of the chemical liquid with the adhesive 530 and the flexible substrate 510 in the corner region a'.

As shown in the corner region a ', the edge region a' is exposed to the chemical liquid 600 when the area exposed to the chemical liquid 600 is divided in a unit length L '. The area to be formed is formed on both sides. That is, the corner region a 'is a region where two sides are joined, and the area exposed to the chemical liquid 600 corresponds to twice the unit length L' than the side region. Therefore, the edge area a 'has a surface area corresponding to 2L' twice the unit length L '.

Therefore, the chemical liquid 600 may contact a plurality of chemical liquids 600 in the corner region a 'because of the tendency to contact the surface areas of a' and b '.

Thus, the chemical solution 600 may be formed in the corner region a 'where the plurality of chemical liquids 600 are in contact with each other, and the adhesive surface to which the flexible substrate 510 and the adhesive 530 are attached. Therefore, a problem may occur that the chemical solution 600 penetrates into the interface region P ′ to which the adhesive 530 and the flexible substrate 510 are attached.

As described above, the chemical liquid 600 used in the cleaning and pattern forming process is performed on the flexible substrate 510 using the adhesive transfer substrate 501. The corner region of the flexible substrate 510 and the adhesive 530 is a. A plurality of quantities can be contacted.

Accordingly, a problem may occur that the chemical solution 600 penetrates into the adhesive interface region between the adhesive 530 and the flexible substrate 510 formed in the corner region a 'of the adhesive transport substrate 501.

Therefore, the penetration of the chemical solution 600 may cause a problem that the flexible substrate 510 is detached from the pressure-sensitive adhesive 530 in the corner region.

As shown in FIG. 3B, the pressure-sensitive adhesive 530 and the flexible substrate may be formed by a plurality of chemical liquids 600 contacted at the corners of the pressure-sensitive adhesive 530 and the flexible substrate 510 formed on the pressure-sensitive adhesive transporting substrate 501. Problems in which the chemical liquid 600 penetrates the adhesive interface of the 510 may occur. Accordingly, the flexible substrate 510 may be detached from the adhesive 530.

As the flexible substrate 510 is detached from the pressure-sensitive adhesive 530, the flexible substrate 510 may be bent in an edge region due to the flexibility of the flexible substrate 510.

As described above, as the flexible substrate 510 is detached and bent from the adhesive 530, a problem may occur in the transfer of the adhesive transport substrate 501, and a plurality of processes may be performed in the bent flexible substrate 510. If this is done, a trouble may occur in the setup of the process equipment.

According to an embodiment of the present invention, an adhesive carrier substrate may be prevented from being detached from the adhesive by changing the shape of the edge region of the flexible substrate and the adhesive to reduce the penetration of the chemical solution into the interface region of the adhesive and the flexible substrate. The purpose is to provide.

Another object of the present invention is to provide a method of manufacturing a flexible display device capable of preventing the flexible substrate from being detached from the pressure-sensitive adhesive to prevent the flexible substrate from being bent and to secure the safety of the flexible display device manufacturing process.

In order to achieve the above object, the adhesive transport substrate according to the present invention is a substrate substrate; A flexible substrate formed on the substrate and formed in a shape to reduce the surface area of the edge region; And a pressure-sensitive adhesive formed on the substrate to adhere the flexible substrate and to reduce the surface area of the edge region.

And the shape of the edge region of the flexible substrate and the pressure-sensitive adhesive is characterized in that it is formed in a rounded shape.

In addition, the shape of the edge region of the flexible substrate and the pressure-sensitive adhesive is characterized in that the edge region parallel to the diagonal direction of the flexible substrate is formed in each cut shape.

Here, the shape of reducing the surface area formed in the edge region of the flexible substrate and the pressure-sensitive adhesive is characterized in that to minimize the concentration of the chemical liquid by lowering the surface energy.

In order to achieve the above object, a method of manufacturing a flexible display device according to the present invention includes the steps of adhering an adhesive on a substrate, adhering a flexible substrate on the adhesive, and a corner region of the flexible substrate and the adhesive. Cutting into a shape in which the surface area is reduced to form an adhesive transport substrate; Moving the adhesive carrier substrate to a production system; It characterized in that it comprises a step of providing a plurality of chemical liquids for the manufacturing process including the pattern production on the adhesive carrier substrate.

Hereinafter, the adhesive transport substrate of the present invention and a method of manufacturing a flexible display device using the same according to the accompanying drawings will be described in detail with reference to the following examples, and those skilled in the art can implement many other embodiments using the teachings of the present invention. The present invention is directed to an adhesive transfer substrate and a method of manufacturing a flexible display device using the same, which are intended to be illustrative and not limited to the following embodiments.

The flexible display device may have a flexible screen and ultimately indicate a display device that can be bent or rolled up. That is, various driving modes are implemented in the flexible substrate.

In this case, in order to use the flexible substrate as a substrate of the display device, it is desirable to satisfy the characteristics required in the existing display device. Therefore, it is desirable to be able to utilize the infrastructure of the existing factory by satisfying the properties corresponding to the characteristics of the glass substrate used in the existing and the suitability for the manufacturing process of the existing display device.

Figures 4a to 4c is a view showing a pressure-sensitive adhesive transfer substrate according to the present invention.

4A is a plan view of the adhesive transfer substrate according to the present invention, and FIG. 4B is an enlarged perspective view of region A of FIG. 4A. 4c is a view showing the surface area according to the unit length of the corner region according to the present invention.

As shown in FIGS. 4A and 4B, the adhesive transfer substrate 1 is adhered to the flexible substrate 10 having flexibility on the substrate substrate 20.

The flexible substrate 10 is a substrate having flexibility such as plastic or metal foil. The flexible substrate 10 is not broken and has a bending characteristic. Accordingly, it is possible to form a flexible flexible display device that is extremely lightweight and convenient to carry with a substrate having the above characteristics.

The flexible substrate 10 is a substrate having flexibility, and a pattern is formed later. However, since the flexible substrate 10 has flexibility, when a process of forming a pattern on the flexible substrate 10 is performed, difficulties such as alignment may occur in forming a switching device having a laminated structure due to the flexibility. Can be.

Therefore, in order to easily perform a process such as aligning and conveying the flexible substrate 10, it is preferable to allow the flexible substrate 10 to maintain a predetermined shape.

Thus, the base substrate 20 can be provided by a shape holding substrate having a hard shape such as a glass substrate or a quartz substrate. The substrate 20 is a substrate capable of maintaining the shape of the flexible substrate 10.

As such, the flexible substrate 10 is adhered on the substrate 20 to maintain the shape of the flexible substrate 10. Accordingly, the ease of conveyance of the flexible substrate 10 and the safety of the process can be ensured.

An adhesive 30 may be provided between the base substrate 20 and the flexible substrate 10.

The pressure-sensitive adhesive 30 serves as an intermediate material that allows the flexible substrate 10 to be adhered on the base substrate 20. The adhesive 30 may be formed such that a strong adhesive force is formed in a direction in which the adhesive 30 is adhered to the substrate substrate 20, and a weak adhesive force is formed between the flexible substrate 10 and the adhesive 30.

The pressure-sensitive adhesive 30 is a kind of adhesive, and the pressure-sensitive adhesive 30 itself may have fluidity as compared with solidifying and bonding the adhesive. Here, the pressure-sensitive adhesive 30 itself has a property that is not affected by the desorbent solution, etc., but when the desorbent solution that can be detached to the adhesive boundary surface is provided, a phenomenon may occur in which it is separated from the adherend.

In this case, each of the edge regions a of the flexible substrate 10 and the adhesive 30 may have a rounded shape, a shape in which edge regions parallel to the diagonal of the flexible substrate 10 are cut, respectively. . The flexible substrate 10 having rounded corners can reduce the penetration of a liquid such as a chemical liquid used in a manufacturing process such as a patterning process to be performed later.

In other words, the edge regions of the flexible substrate 10 and the adhesive 30 are formed in the rounded shape, or the edge regions parallel to the diagonal directions of the flexible substrate 10 are cut out, respectively, so that the flexible substrate 10 is formed. ) And the surface area of the edge region of the pressure-sensitive adhesive 30 can be reduced. That is, the surface area exposed to liquids, such as the said chemical liquid, can be reduced.

The surface area may reduce surface free energy (hereinafter, referred to as surface energy) to reduce a contact amount of a liquid such as a chemical liquid that may contact the surface area. Therefore, problems such as bending of the flexible substrate 10 generated as the liquid such as the chemical liquid comes into contact with (or penetrates) the thickness surface of the flexible substrate 10 can be reduced. The shape of the edge region a of the flexible substrate 10 and the problems related to the penetration of the liquid will be described in detail later with reference to FIGS. 5A and 5B.

As such, the adhesive transport substrate 1 may be adhered onto the substrate 20 to easily transport the flexible substrate 10. In addition, as the flexible substrate 10 can maintain a predetermined shape, a manufacturing process of forming a pattern on the flexible substrate 10 can be easily performed.

In this case, the shape of the edge region a of the flexible substrate 10 is formed into a rounded shape, a shape in which the edge regions a parallel to the diagonal direction of the flexible substrate 10 are cut out, respectively, or the like, to form a pattern manufacturing process. In the process of providing a liquid such as a pharmaceutical solution, the flexible substrate 10 may be detached and prevent bending defects, and the like, thereby securing stability of the process.

As shown in FIG. 4B, the flexible substrate 10 and the pressure-sensitive adhesive 30 are divided in the horizontal / vertical direction by the unit length L for convenience of description.

The sector formed by dividing the virtual unit length L is classified into a sector of a corner area, b sector of a side area, and c sector covered by the flexible substrate 10.

The c sector is an area in which the pressure-sensitive adhesive 30 is not exposed to the chemical liquid 100 due to the flexible substrate 10.

The b sector indicates the side region of the pressure-sensitive adhesive 30. Since the pressure-sensitive adhesive 30 is formed to have a predetermined thickness, one side surface of the pressure-sensitive adhesive 30 in the side region b is exposed to the outside. Thus, a liquid such as the chemical liquid may be contacted along the thickness surfaces of the pressure sensitive adhesive 30 and the flexible substrate 10 in the edge region.

The sector a indicates the corner area a of the adhesive 30 and the flexible substrate 10. The corner region a is a region where two sides are joined, and an area exposed to the chemical liquid may have a larger exposed area than b sector of the side region.

Like the surface area according to the unit length shown in FIG. 4C, the flexible substrate 10 and the pressure-sensitive adhesive 30 are formed in the shape of reducing the exposed surface area in the corner region a. Here, in the embodiment, the corner region a will be described as being formed in a rounded shape.

As the corner region a is formed in a rounded shape, the surface area exposed to the outside (chemical liquid) can be reduced. Here, in order to explain the relationship between the surface area and the surface energy, the chemical solution provided to the adhesive transport substrate will be described in an embodiment.

Here, when the rounded corner region a is defined by defining the rounded shape as a circle, it is 2Rπ (where π is defined as 3.14) according to the length formula. In this case, the edge area a corresponds to 1/4 of a circular shape, and thus the exposure length is (1/4) * 2 * "L" * π. That is, an exposure surface area corresponding to the exposure length (L / 2) * π is generated.

Thus, the edge area a may be in contact with the exposed surface area of the exposure length “(L / 2) * π” in order to be in equilibrium with the exposed surface area corresponding to the exposed length “L”. Therefore, the chemical liquid can be brought into contact with the exposed surface area corresponding to the exposure length "(L / 2) * π". That is, the adhesive 30 and the flexible substrate 10 can be in contact with the thickness surface.

2A, when the conventional unit lengths "L '" and "L" are defined as the same length, an exposed surface area having an exposure length of 2L is formed in the conventional edge region a. In the present invention, the edge area a may have an exposed surface area having an exposure length of "(L / 2) * π" (that is, 1.57L).

In this way, the exposed surface area can be reduced by changing the shape of the corner region a. That is, the contact surface area of the chemical liquid 100 can be reduced. Therefore, the exposed surface area can be reduced in the corner region a according to the rounded shape of the corner region a according to the present invention.

Therefore, the amount of contact of the liquid such as the chemical liquid provided in a later process or the like can be reduced by the exposed surface area reduced in the corner region a.

Figure 5a is a plan view showing a chemical liquid in contact with the adhesive carrier substrate according to the present invention, Figure 5b is a cross-sectional view taken along III-III 'of Figure 5a. Herein, the thickness of the flexible substrate 10 and the thickness of the pressure-sensitive adhesive 30 will be described as being formed to have a predetermined uniform thickness.

As illustrated in FIG. 5A, the adhesive transport substrate 1 may use various chemical liquids 100 by performing the pattern forming process on the flexible substrate 10. In this case, the chemical liquid 100 is provided on a plane of the flexible substrate 10 to perform a pattern forming process. However, since the chemical liquid 100 is in a liquid state, the chemical liquid 100 may flow to contact the side surface of the flexible substrate 10.

The rounded corner region is defined as "a", and the edge region is defined as "b" region. In addition, a region formed inside the side region b and covered by the surface of the flexible substrate 10 and not exposed to the adhesive 30 is defined as a “c” region.

Here, the flexible substrate 10 and the pressure-sensitive adhesive 30 is formed to a predetermined thickness. Therefore, the thickness surface becomes an area exposed to the outside.

That is, the edge area a and the side area b are areas exposed to the outside.

Therefore, in the present invention, the rounded shape of the corner region and the diagonally parallel corner regions of the flexible substrate are cut out so as to reduce the surface area exposed to the chemical liquid 100 in the sector a. can do.

Here, the surface area exposed to the chemical liquid 100 provides surface energy that the chemical liquid 100 can contact, so that the larger the surface area is formed, the greater the contact amount that the chemical liquid 100 can contact.

Therefore, the exposed surface area may be minimized because problems such as detachment of the flexible substrate 10 from the pressure-sensitive adhesive 30 may occur due to the contact amount of the chemical liquid 100.

That is, the chemical liquid 100 may contact the sides of the flexible substrate 10 and the adhesive 30 to etch the adhesive 30 formed between the substrate substrate 20 and the flexible substrate 10 or the flexible substrate. Penetrating into the interface between the 10 and the pressure-sensitive adhesive 30 may cause a problem in that the flexible substrate 10 is detached from the pressure-sensitive adhesive 30.

In particular, the chemical liquid 100 is able to contact a larger amount in the corner region (a) than the side region (b). That is, since the chemical liquid 100 is a liquid, a contact amount may be formed according to surface energy. The surface energy is energy required to move the liquid molecules in the liquid to the surface to form a unit surface area.

The surface energy is a state in which the internal molecules 100b of the liquid (that is, the chemical liquid 100) maintain a constant binding force with neighboring molecules, and their states are balanced and stable. On the other hand, the surface of the liquid is in an unbalanced state to form a binding force of the liquid molecules in the liquid direction.

Therefore, the molecules 100a on the liquid surface have a larger energy state than the liquid molecules 100b therein, and thus tend to be in a stable state by minimizing the number of molecules 100a on the liquid surface as much as possible.

In other words, the molecules 100a on the liquid surface tend to stabilize by forming an equilibrium state by combining with an external surface. This is the same principle as trying to fill an unstable state once the atmosphere is created, as it is the safest state to completely fill the required electron orbit on the safest electronic orbit.

Thus, in the present invention, the contact area of the molecules 100a on the liquid surface can be reduced by reducing the exposed surface area by changing the shape of the corner region a to the rounded shape.

Since the exposed surface area has been described with reference to FIG. 4C, it is omitted.

As shown in FIG. 5B, the pressure-sensitive adhesive 30 and the flexible substrate 30 provided on the pressure-sensitive adhesive transport substrate 1 are formed by the shape of the edge region a as the side portion is exposed to the chemical liquid 100. The contact amount of the chemical liquid 100 may be formed differently according to the surface area.

As the corner region a is formed in a rounded shape, the surface area exposed to the outside (chemical liquid) can be reduced. Here, in order to explain the relationship between the surface area and the surface energy, the chemical liquid 100 provided to the adhesive transport substrate 1 will be described as an embodiment.

In this case, the surface molecules of the chemical liquid 100, which is the liquid, lower the surface energy to be in an equilibrium state and become a stable state. In other words, the molecules on the liquid surface are bound to the outer surface and try to stabilize in parallel. Here, the equilibrium state is defined as "0".

Here, as described with reference to FIG. 4C, the rounded corner region a generates an exposed surface area having a length corresponding to the exposure length L / 2 * π.

Thus, the chemical liquid 100 is exposed to the surface area corresponding to the exposure length "(L / 2) * π" in order to be in equilibrium with the surface area corresponding to the unit length L exposed in the corner area a. ) May be in contact. Therefore, the chemical liquid 100 may be in contact with the thickness surface of the pressure-sensitive adhesive 30 and the flexible substrate 10 to the exposed surface area corresponding to the exposure length "L / 2 * π".

In this way, the exposed surface area can be reduced by changing the shape of the corner region a. That is, the contact surface area of the chemical liquid 100 can be reduced.

Therefore, according to the rounded shape of the corner region (a) according to the present invention, it is possible to reduce the amount of contact with the chemical liquid 100 in the corner region (a). Referring to Figure 3a, by reducing the exposed surface area of the present invention it is possible to reduce the contact amount of the chemical liquid 100 in contact with the thickness surface. That is, the amount of the chemical liquid 100 that can penetrate the adhesive interface between the adhesive 30 and the flexible substrate 10 may be reduced.

As described above, as the contact surface area of the chemical solution 100 is reduced, the amount of contact of the chemical solution 100 to the corner region a is reduced, so that the adhesive interface between the adhesive 30 and the flexible substrate 10 is reduced. The chemical solution 100 can be prevented from penetrating.

Therefore, the chemical solution 100 may be penetrated into the adhesive interface to prevent the problem that the flexible substrate 10 is detached from the adhesive 30.

6a and 6b are views showing another embodiment of the shape of the corner region according to the present invention.

In the adhesive transport substrate 1, the flexible substrate 10 is adhered to the substrate substrate 20 by an adhesive 30. The adhesive transport substrate 1 is subjected to a plurality of processes, such as a process of forming a pattern on the flexible substrate 10.

Since the process uses a plurality of chemical liquids 100 and the chemical liquids 100 are liquid, the flexible substrate 10 and the adhesive 30 can be contacted along the sides.

However, the liquid chemical solution 100 tends to contact a high surface area according to surface free energy. Herein, the chemical liquid 100 formed of liquid may have a tendency to stabilize by forming molecules in the equilibrium state by combining molecules on the surface of the chemical liquid 100 with external surfaces according to surface free energy.

Thus, the flexible substrate 10 and the pressure-sensitive adhesive 30 may be formed in a diagonally cut shape of the flexible substrate 10 in the corner region a having a high surface area, thereby minimizing a surface area.

Here, the length of the diagonally cut shape of the present invention may correspond to (2) ^1/2 L according to the Pythagorean theorem. (2) ^1/2 is defined as 1.4. That is, a surface area having a length of 1.4L can be formed.

As such, by reducing the surface area of the corner region a, the surface area that the chemical liquid 100 may contact may be reduced. Therefore, as the surface area of the pressure sensitive adhesive 30 and the flexible substrate 10 is reduced, the amount of contact of the chemical liquid 100 in the corner area a is reduced, so that the pressure sensitive adhesive surface of the pressure sensitive adhesive 30 and the flexible substrate 10 is reduced. Infiltration of the chemical liquid 100 may be minimized.

Therefore, it is possible to prevent the flexible substrate 10 from being detached from the adhesive 30.

7A to 7E schematically illustrate a method of manufacturing an adhesive carrier substrate and a method of manufacturing a flexible display device using the adhesive carrier substrate.

As shown in FIG. 7A, the flexible substrate is not broken and has a bending characteristic. Accordingly, it is possible to form a flexible flexible display device that is extremely lightweight and convenient to carry with a substrate having the above characteristics.

Since the flexible substrate has flexibility, it may be difficult to continuously maintain a predetermined shape. In addition, since the flexible substrate is flexible, it may be difficult to convey the flexible substrate when it is transported. In addition, the flexible substrate should be aligned when the switching element having the stacked structure is formed, but misalignment may occur due to the flexible characteristics of the flexible substrate.

Thus, the base substrate 20 having a predetermined shape is provided, and the pressure-sensitive adhesive 30 is adhered on the base substrate 20.

The base substrate 20 allows the flexible substrate, which has flexibility in carrying out a manufacturing process, conveyance, and the like, to form a pattern on the flexible substrate so as to maintain a predetermined shape. Therefore, it is possible to easily perform a process such as alignment, conveyance of the flexible substrate.

The pressure-sensitive adhesive 30 is a kind of adhesive, and the pressure-sensitive adhesive 30 itself has fluidity as compared with solidifying and bonding the adhesive. Here, the pressure-sensitive adhesive 30 itself has a property that is not affected by the desorption chemical, etc., but may be peeled off if a liquid or the like that can be desorbed to the pressure-sensitive interface is provided.

And a release paper is provided on the surface of the adhesive 30. As such, the adhesive 30 is coated with a release paper. The release coating is to form a cured film of a thin film on a substrate such as paper for release of the adhesive material. And the release paper is coated on one or both sides of the pressure-sensitive adhesive 30 can be protected until the pressure-sensitive adhesive 30 is used. The release paper protects the pressure-sensitive adhesive 30, and in addition, it must meet a variety of requirements in the process or in between, the pressure-sensitive adhesive with the characteristics such as appropriate release force, pressure-sensitive adhesive (30) long-term storage resistance, curing resistance, suitable mechanical strength, etc. The shape of 30 can be maintained.

Here, release paper is provided on both sides of the pressure-sensitive adhesive 30. The adhesive 30 may be rolled to perform a laminating process. As such, the laminating process may be performed to improve the adhesive strength of the pressure-sensitive adhesive 30 with the base substrate 20. In addition, the pressure-sensitive adhesive 30 may be thin on the base substrate 20, and may have an adhesive force (anchorage) evenly.

As shown in FIG. 7B, the upper release paper of the adhesive 30 is peeled off, and the flexible substrate 10 capable of forming the flexible display device on the upper portion of the peeled adhesive 30 is adhered. Here, the flexible substrate 10 may also perform a laminating process.

This may prevent the flexible substrate 10 from being unformed in a thin shape on the pressure-sensitive adhesive 30 because of the flexibility that is a characteristic of the flexible substrate 10.

And both sides of the pressure-sensitive adhesive 30 may be provided with different adhesive strengths. As such, the reason why the double-sided pressure sensitive adhesive 30 having different adhesive strengths is provided is that the interface that is adhered to the base substrate 20 is formed with strong adhesive force to prevent desorption of the manufacturing process, and the interface that is adhered to the flexible substrate 100 is This is because when the manufacturing process such as a pattern formed on the flexible substrate 10 is completed, the flexible substrate 10 should be detached from the adhesive 30 to form a flexible display device.

As shown in FIG. 7C, the edge regions of the flexible substrate 10 and the adhesive 30 may be cut to reduce the surface area. The corner region may have a rounded shape and a surface cut in the diagonal direction of the flexible substrate 10 to reduce the surface area exposed to the outside.

Here, the shape of the corner region is described with reference to FIGS. 5A and 5B, FIGS. 6A and 6B. The cut shape of the corner region reduces the surface area of the corner region, and the pattern forming process of the flexible substrate 10 is performed later. It is possible to reduce the amount of contact of the liquid, such as the chemical liquid used in the.

Therefore, as the amount of contact of the chemical liquid 100 to the corner region a is reduced, the pressure sensitive adhesive 30 of the frost region is etched into the chemical liquid 100, or the flexible substrate 10 and the pressure sensitive adhesive ( 30 may penetrate into the adhered interface, thereby minimizing the problem that the flexible substrate 10 is detached from the adhesive 30.

As such, the edge region a of the flexible substrate 10 and the adhesive 30 may be cut to form the adhesive transport substrate 1 according to the present invention.

As shown in FIG. 7D, the adhesive transfer substrate 1 according to the present invention is moved to a production system equipment 200, such as a cleaning process or a pattern forming process.

The production system 200 may wash the flexible substrate 10 or form a pattern on the flexible substrate 10.

Here, the pattern forming process on the flexible substrate 10 will be briefly described. A photosensitive film or the like may be formed to deposit the conductive material on the flexible substrate 10 to form the conductive film and form the shape of the conductive film by a deposition process or the like. Form.

The photosensitive pattern may be formed by exposing the photosensitive film and using a chemical liquid for removing the photosensitive film classified as curing / uncuring the photosensitive film. An etchant is used to form the shape of the conductive film using the conductive material as the protective film. Then, the photosensitive pattern is removed using a chemical solution for stripping the photosensitive pattern.

By repeatedly performing the manufacturing process, a pattern such as a switching device may be formed on the flexible substrate 10 to form a flexible display device.

By the way, a some chemical liquid etc. are used in the said process. A plurality of chemical liquids such as a photosensitive pattern chemical, an etching liquid, and a strip chemical are used, and the above process is repeatedly performed.

Therefore, the chemical liquid is in contact with the side of the pressure-sensitive adhesive 30 can penetrate the contact surface of the pressure-sensitive adhesive 30 and the flexible substrate 10. The penetrated chemical liquid may cause a problem of detaching the flexible substrate 10 from the pressure-sensitive adhesive 30 and may cause a problem that the edge region a of the flexible substrate 10 is bent.

Thus, the shape of the corner region a in which the contact amount of the chemical liquid is increased to a rounded shape, a shape cut diagonally, and the like can reduce the surface area exposed to the chemical liquid.

As illustrated in FIG. 7E, the chemical liquid 100 provided in the manufacturing apparatus of the production system may contact the side of the adhesive 30 on the adhesive transport substrate 1.

In this case, since the chemical liquid 100 provided on the adhesive transport substrate 1 is a liquid, the chemical liquid 100 may flow along the surface of the flexible substrate 10 to be in contact with the sides of the flexible substrate 10 and the adhesive 30. As such, the contacting chemical liquid 100 may be in contact with the side of the pressure-sensitive adhesive 30 to penetrate the interface between the flexible substrate 10 and the pressure-sensitive adhesive 30.

In particular, the contact amount of the chemical liquid 100 in the corner region (a) of the flexible substrate 10 and the pressure-sensitive adhesive 30 may increase. The reason why the amount of contact of the chemical liquid 100 in the corner region is increased is omitted since it has been described with reference to FIGS. 5A and 5B.

As such, the flexible substrate 10 may be detached from the pressure-sensitive adhesive 30 due to the amount of contact of the chemical liquid 100 in the corner region a. In addition, the bending of the flexible substrate 10 may occur due to the detachment of a portion of the flexible substrate 10, and the bending may cause processing equipment and the adhesive transfer substrate 1 to be damaged.

However, the edge area (a) of the adhesive 30 and the flexible substrate 10 is formed in a rounded shape, a shape in which the surface area is reduced in a shape in which diagonal edge regions parallel to the diagonal direction of the flexible substrate are cut, respectively. Accordingly, the contact amount of the chemical liquid 100 can be reduced.

As such, the shapes of the flexible substrate 10 and the adhesive 30 of the adhesive transport substrate 1 may be changed to reduce the amount of contact of the chemical liquid 100 to the corner region a. Therefore, it is possible to solve the problem that the flexible substrate 10 is detached from the adhesive (30).

In addition, the flexible substrate 10 may be prevented from being detached from the adhesive 30 to form an adhesive transport substrate 1 which may prevent the flexible substrate 10 from bending, and the adhesive transport substrate ( The adhesive transport method using 1) may ensure the safety of the flexible display device manufacturing process.

As described above, the pressure-sensitive adhesive transfer substrate of the present invention can change the shape of the flexible substrate and the pressure-sensitive adhesive to reduce the amount of contact of the liquid and the like liquid to the corner area. Therefore, it is possible to solve the problem that the flexible substrate is detached from the pressure-sensitive adhesive.

In addition, the flexible substrate may form a pressure-sensitive adhesive substrate that can prevent a part of the adhesive from being detached and prevent the flexible substrate from being bent, and safety of the flexible display device manufacturing process using the pressure-sensitive adhesive substrate. Can be secured.

Claims (19)

A base substrate; A flexible substrate formed on the substrate and formed in a shape to reduce the surface area of the edge region; And a pressure-sensitive adhesive formed on the substrate to adhere the flexible substrate and to reduce the surface area of the edge region. The method of claim 1, The flexible substrate and the adhesive carrier substrate, characterized in that the shape of the corner region of the pressure-sensitive adhesive is formed in a rounded shape. The method of claim 1, The shape of the edge region of the flexible substrate and the pressure-sensitive adhesive is characterized in that the adhesive substrate is formed in a shape in which the corners parallel to the diagonal direction of the flexible substrate is cut. The method of claim 1, The substrate is a pressure-sensitive adhesive transport substrate, characterized in that the hard substrate comprising a glass substrate, a quartz substrate. The method of claim 1, The shape of reducing the surface area formed in the edge region of the flexible substrate and the pressure-sensitive adhesive carrier substrate, characterized in that to minimize the concentration of the chemical liquid by lowering the surface energy. The method of claim 1, The flexible substrate or the adhesive carrier substrate, characterized in that the shape of the corner region of the pressure-sensitive adhesive is formed in a rounded shape. The method of claim 1, The shape of the edge region of the flexible substrate or the pressure-sensitive adhesive is characterized in that the adhesive substrate is formed in a shape in which the corners parallel to the diagonal direction of the flexible substrate are cut. Adhering a pressure-sensitive adhesive on a substrate, adhering a flexible substrate on the pressure-sensitive adhesive, and cutting an edge area of the flexible substrate and the pressure-sensitive adhesive into a shape to reduce a surface area; Moving the adhesive carrier substrate to a production system; And providing a plurality of chemical liquids for a manufacturing process including manufacturing a pattern on the adhesive transfer substrate. The method of claim 8, The shape of the edges of the flexible substrate and the pressure-sensitive adhesive is formed in a rounded shape. The method of claim 8, The shape of the edge region of the flexible substrate and the pressure-sensitive adhesive is characterized in that the shape of the edge region of the flexible substrate and the pressure-sensitive adhesive is formed in a shape in which the corners parallel to the diagonal direction of the flexible substrate are cut out, respectively. Tooth manufacturing method. The method of claim 8, The shape of the edge portion of the flexible substrate or the pressure-sensitive adhesive is formed in a rounded shape. The method of claim 8, The shape of the edge region of the flexible substrate or the adhesive is the shape of the edge portion of the flexible substrate and the pressure-sensitive adhesive is formed in a shape in which the corners parallel to the diagonal direction of the flexible substrate are cut out respectively. Manufacturing method. The method of claim 8, And minimizing the chemical liquid penetrating the adhesive substrate to which the flexible substrate and the adhesive are adhered by the shape of the edge region. A base substrate; A flexible substrate formed on the base substrate; And a pressure-sensitive adhesive formed on the substrate to adhere the flexible substrate and to reduce the surface area of the edge region. The method of claim 14, The flexible substrate and the adhesive carrier substrate, characterized in that the shape of the corner region of the pressure-sensitive adhesive is formed in a rounded shape. The method of claim 14, The shape of the edge region of the flexible substrate and the pressure-sensitive adhesive is characterized in that the adhesive substrate is formed in a shape in which the corners parallel to the diagonal direction of the flexible substrate is cut. A base substrate; A flexible substrate formed on the base substrate and formed in a shape of reducing a surface area in an edge region; And a pressure-sensitive adhesive for adhering the flexible substrate onto the substrate. The method of claim 17, The flexible substrate and the adhesive carrier substrate, characterized in that the shape of the corner region of the pressure-sensitive adhesive is formed in a rounded shape. The method of claim 17, The shape of the edge region of the flexible substrate and the pressure-sensitive adhesive is characterized in that the adhesive substrate is formed in a shape in which the corners parallel to the diagonal direction of the flexible substrate is cut.

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