KR20170110241A - Window substrate and preparing method thereof - Google Patents

Abstract

The present invention relates to a window substrate and a method of manufacturing the same. More particularly, the present invention relates to a window substrate and a method of manufacturing the same. More particularly, the present invention relates to a window substrate and a method of manufacturing the same, And a method for manufacturing the same.

Description

[0001] WINDOW SUBSTRATE AND PREPARING METHOD THEREOF [0002]

The present invention relates to a window substrate and a method of manufacturing the same.

In recent years, various display devices have a window cover for display protection on a display panel to protect the display panel from scratches or external impact, and most of them use a tempered glass for display as a window cover. Tempered glass for displays is thinner than ordinary glass, but is characterized by high strength and scratch resistance.

However, since the tempered glass has a disadvantage that it is not suitable for weight reduction of a portable device due to its heavy weight, it is difficult to realize an unbreakable property because it is vulnerable to an external impact, and is not bendable, It is not suitable as a flexible display material having a foldable function.

In recent years, studies on optical plastic covers having strength or scratch resistance corresponding to tempered glass, while ensuring flexibility and impact resistance, have been made variously. However, the polymer plastic film not only lacks physical properties in terms of hardness and scratch resistance as compared with tempered glass used as a window cover for display protection, but also has insufficient impact resistance. Therefore, a window substrate in which a composite resin composition is coated on these plastic films to compensate for scratch resistance, impact resistance and the like is used.

However, according to the conventional physical method at the time of cutting the plastic film formed with such a coating layer, there is a problem that cracks are generated or cracked due to tensile and shear stress caused when a physical force is applied, and dust is generated, There is a problem that further chamfering is required.

In order to overcome the above problem, a laser cutting method has been proposed. However, in such a case, as shown in FIG. 1, due to the shape in which the laser passes through the lens, And the difference in width between the tapered upper and lower surfaces is increased, so that there is another problem that the cut portion is visible to the user.

Korean Patent Laid-Open Publication No. 2015-0069414 discloses a method of manufacturing a cover window.

Korean Patent Publication No. 2015-0069414

SUMMARY OF THE INVENTION It is an object of the present invention to provide a window substrate in which the difference in width between the upper and lower surfaces of the tapered section is very small.

It is an object of the present invention to provide a manufacturing method which can obtain a window substrate having a very small difference in width between the top and bottom surfaces of the tapered end face without causing problems such as cracking and dust generation at the time of cutting.

1. A backlight unit comprising: a base film; and a hard coating layer on one side of the base film,

And the difference in width between the taper upper surface and the lower surface is less than 80 占 퐉.

2. The film of claim 1, wherein the substrate film is made of a material selected from the group consisting of polyethylene terephthalate, polyethylene ether phthalate, polyethylene naphthalate, polycarbonate, polyarylate, polyetherimide, polyether sulfonic acid, polyimide and polyacrylate Wherein the substrate comprises a material of at least material.

3. The window substrate of claim 1, wherein the hard coat layer has a hardness of from 2H to 9H.

4. The window substrate according to item 1, wherein the hard coating layer side is tapered.

5. The window substrate according to 1 above, further comprising a shielding pattern on a non-display portion of the other surface of the base film.

6. The window substrate of claim 5, wherein the hard coat layer side is tapered.

7. An optical laminate comprising a window substrate according to any one of the above 1 to 6.

8. The optical laminate according to 7 above, wherein a polarizing plate or a touch sensor is provided on the lower side of the window substrate.

9. The optical laminate according to 7 above, wherein a touch panel integrated with a polarizing plate is provided on the lower side of the window substrate.

10. A method for manufacturing a window substrate comprising cutting a raw substrate film on which a hard coating layer is disposed on a surface with a laser having a wavelength of 9.3 to 9.6 占 퐉, an output of 10 to 100 W, a velocity of 10 to 1,000 mm / s and a pulse repetition rate of 1 to 50 kHz Way.

11. The film of claim 10, wherein the substrate film is a film of a polymer selected from the group consisting of polyethylene terephthalate, polyethylene ether phthalate, polyethylene naphthalate, polycarbonate, polyarylate, polyetherimide, polyether sulfonic acid, polyimide and polyacrylate Wherein the substrate comprises a material of at least a material.

12. The method of manufacturing a window substrate according to 10, wherein the hard coating layer has a hardness of 2H to 9H.

13. The method of manufacturing a window substrate according to claim 10, wherein the base film further comprises a light shielding pattern on a non-display portion of the other surface.

14. The method of manufacturing a window substrate according to any one of the above-mentioned 10 to 13, wherein the laser is irradiated toward the base material film side.

The window substrate of the present invention has a very small difference in width between the upper and lower surfaces of the tapered end face, and minimizes the possibility that the cut face is visible to the user.

The method of manufacturing a window substrate of the present invention can manufacture a window substrate having a very small difference in the top and bottom widths of the tapered end faces.

The method of manufacturing a window substrate of the present invention does not cause problems such as cracking, cracking, and dust generation at the time of cutting, and does not require an additional polishing step.

FIG. 1 is an embodiment showing how a taper oblique direction can be adjusted in the window substrate of the present invention.
2 is a plan view of a window substrate which is cut and cracked according to a conventional physical method.
FIG. 3 shows a case (a) in which a hard coating layer is formed on one surface, a window substrate on which a light shielding pattern is formed on a non-display portion on the other surface is cut by a method according to an embodiment of the present invention, and (b) Fig.

The present invention relates to a substrate film and a substrate substrate that includes a hard coating layer on one side of the substrate film and has a tapered end portion and a width difference between the upper and lower surfaces of the tapered portion is less than 80 占 퐉, And a method for producing the same.

Hereinafter, the present invention will be described in detail.

The window substrate of the present invention includes a base film (100) and a hard coating layer (200) on one side of the base film (100).

As the base film 100, a transparent film material known in the art may be used without limitation, and examples thereof include polyethylene terephthalate, polyethylene ether phthalate, polyethylene naphthalate, polycarbonate, polyarylate, polyetherimide, polyether Sulfonic acid, polyimide, polyacrylate and the like can be used. These may be used singly or in combination of two or more, and may be a single layer of these materials or a laminated structure of two or more layers.

The thickness of the base film 100 is not particularly limited and may be, for example, 1 to 150 mu m, and may be 10 to 50 mu m so as to be bent or bent without damage.

The hard coating layer 200 is disposed on one side of the base film 100 for the purpose of protecting the base film 100 from a life impact such as scratches.

The hard coat layer 200 may be formed by coating on the base film 100 or may be transferred onto the base film 100.

The hard coating layer 200 may be a hardened layer such as an acrylic resin, a urethane resin, an epoxy resin, a siloxane resin or the like, which is well known in the art, but is not limited thereto.

The hard coat layer 200 may have a hardness of, for example, 2H to 9H, but is not limited thereto.

The thickness of the hard coat layer 200 is not particularly limited, and may be, for example, 0.1 to 30 占 퐉. If the thickness is less than 0.1 탆, the protective effect of the base film 100 may be insignificant. If it exceeds 30 탆, the flexibility of the window substrate may be deteriorated.

The window substrate of the present invention has a tapered end.

In the window substrate of the present invention, the difference in width between the upper surface where the taper is narrowed by the taper and the lower surface is less than 80 mu m. If the width difference exceeds 80 탆, the cut surface may be visible to the user or may be out of specification due to the difference in width and may not be used as a product. Preferably less than 60 占 퐉, and more preferably 40 占 퐉.

The method for realizing the width difference of less than 80 mu m is not particularly limited and can be realized by cutting with a laser of a specific condition described later, for example.

As shown in the upper part of FIG. 1, the hard coating layer 200 may be tapered, or the hard coating layer 200 may be tapered, as shown in the lower part of FIG. In order to reduce the visibility of the tapered shape of the end face, it is preferable that the side of the hard coat layer 200 is tapered as shown in the upper part of FIG.

As a specific example of the case of cutting by irradiating the laser, the oblique direction can be determined by the laser irradiation direction. 1, when the laser beam is irradiated toward the base film 100, the side of the base film 100 becomes a tapered upper surface. When the laser beam is irradiated toward the hard coating layer 200 as shown in the lower part of FIG. 1, Tapered upper surface.

The window substrate of the present invention may further include a light shielding pattern 300.

The window substrate is applied to an image display device or the like. The image display device is divided into a display portion for displaying an image and a non-display portion surrounding the image portion. The non-display portion is formed with a wiring or the like connected to the panel driving portion. The light shielding pattern 300 (bezel) is formed so that the wiring is not visible to the user.

The light shielding pattern 300 may be a cured pattern of a colored resin composition, a colored ink, or the like.

The light shielding pattern 300 may be formed on the other side of the window substrate by a coating, printing, photolithography or the like known in the art or may be a transferred one.

The thickness of the shielding pattern 300 is not particularly limited, and may be, for example, 1 to 30 占 퐉.

In the case where the window substrate further includes the light shielding pattern 300, it is preferable that the side of the hard coating layer 200 is tapered so that the user can see less the cut surface.

The present invention also provides an optical laminate including the window substrate.

The optical laminate of the present invention may include a polarizing plate, a touch sensor, a polarizing plate-integrated touch sensor or the like on the lower side of the window substrate.

The optical laminate of the present invention may be an image display apparatus further comprising a display panel.

The image display apparatus of the present invention may be not only a liquid crystal display apparatus but also various image display apparatuses such as an electroluminescent display apparatus, a plasma display apparatus, a field emission display apparatus and the like, and the window substrate may be applied as a cover window substrate of an image display apparatus.

The present invention also provides a method of manufacturing the window substrate.

A method of manufacturing a window substrate according to the present invention is a method for manufacturing a window substrate, comprising the steps of: providing a base substrate film (100) having a hard coating layer (200) on one surface thereof with a wavelength of 9.3 to 9.6 占 퐉, an output of 10 to 100 W, a speed of 10 to 1,000 mm / s and a pulse repetition rate of 1 to 50 kHz Of the laser beam.

The base material film 100 having the hard coat layer 200 disposed on one surface thereof as the base film 100 before cutting forms at least one or more window substrates by cutting.

The components, thickness, etc. of the hard coat layer 200 and the base film 100 are as described above.

There is a problem that when the base film 100 having the hard coat layer 200 formed on one surface thereof is physically cut, a crack is generated due to tensile and shear stress caused when a physical force is applied. 2 shows a case where a crack is generated in the hard coating layer 200 when the base film 100 on which the hard coating layer 200 is formed is cut using a knife. Further, dust is generated at the time of cutting, and there is a further problem that chamfering of the cut surface is further required.

On the other hand, when cutting with a laser, not a physical method, the edge of the window substrate cut by the inclination of the laser is tapered as shown in Fig. If there is a problem that the taper is visually large and the difference in width between the upper surface and the taper is large, the product may be out of specification due to the difference in width and may not be used as a product.

The inventors of the present invention have found that the above problem can be solved by reducing the difference in width between the top surface and the end surface of the taper of the end portion when cutting the raw material base film 100 on which the hard coating layer 200 is disposed, The present invention has been devised.

As the laser used for cutting, a CO ₂ -mediated laser having a wavelength of 9.3 to 9.6 탆 can be used. The CO ₂ -mediated laser of the above wavelength range is easily absorbed into the transparent material of the polymer material.

The laser is irradiated at an output of 10 to 100 W. When the output is within the above range, cutting can be performed without causing cracks or thermal damage on the cut surface.

The laser used for cutting has a pulse repetition rate of 1 to 50 kHz. If the pulse repetition rate is less than 1 kHz, the laser may not be overlapped and cutting may be difficult. If the pulse repetition rate is 50 kHz or more, the laser beam may be overlapped and the base film 100 may be damaged.

The base material film 100 is cut at a speed of 10 to 1,000 mm / s. If the cutting speed is less than 10 mm / s, cracking or thermal damage of the cut surface may occur. If the cutting speed is more than 1,000 mm / s, sufficient cutting may be difficult.

1, the laser may be irradiated toward the hard coating layer 200 side or may be irradiated toward the base film 100 side as shown in the upper part of FIG. 1 . The laser can be irradiated toward the base film 100 side in view of reducing the cut surface to the user.

The base film 100 according to the present invention may further include a shielding pattern 300 on the non-display portion of the other surface. In such a case, when the laser is irradiated toward the base film 100 side, the cut surface can be further reduced to the user.

The light shielding pattern 300 may have the above-described material, thickness, and the like.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the invention and are not intended to limit the scope of the claims. It will be apparent to those skilled in the art that such variations and modifications are within the scope of the appended claims.

Example  And Comparative Example

A polyimide base film having a thickness of 10 mu m and a hardness of 6H was formed on one surface and a light shielding pattern formed of a colored resin composition on the non-display portion of the other surface was prepared.

The base film was cut under the conditions shown in Table 1 below.

 (1) Cutting quality evaluation

The cutting quality was evaluated by visually observing the cut surface state with an optical microscope.

Good: The cut surface is cut without damages such as cracks, and the difference in the width of the taper upper and lower surfaces is 80 占 퐉 or less

Defective: It is not cut, there is a burned or burned mark on the cut surface,

(2) Taper  Measure difference in width between upper and lower

The tapered surface was observed with an optical microscope, and the difference in width between the upper and lower surfaces was measured.

division Irradiation surface laser Cut quality evaluation Taper width difference
(탆) wavelength
(탆) Print
(W) speed
(mm / s) Pulse repetition rate
(kHz) Example 1 Hard coating side 9.3 25 300 9 Good 59 Example 2 Hard coating side 9.3 50 300 9 Good 68 Example 3 Hard coating side 9.3 30 200 9 Good 65 Example 4 Hard coating side 9.3 30 500 9 Good 58 Example 5 Hard coating side 9.3 30 300 5 Good 61 Example 6 Hard coating side 9.3 30 300 20 Good 54 Example 7 Shading pattern side 9.3 25 300 9 Good 53 Example 8 Shading pattern side 9.3 50 300 9 Good 61 Example 9 Shading pattern side 9.3 30 200 9 Good 58 Example 10 Shading pattern side 9.3 30 500 9 Good 51 Example 11 Shading pattern side 9.3 30 300 5 Good 64 Example 12 Shading pattern side 9.3 30 300 20 Good 52 Example 13 Hard coating side 9.6 25 300 10 Good 38 Example 14 Hard coating side 9.6 50 300 10 Good 41 Example 15 Hard coating side 9.6 30 200 10 Good 45 Example 16 Hard coating side 9.6 30 500 10 Good 35 Example 17 Hard coating side 9.6 30 300 5 Good 41 Example 18 Hard coating side 9.6 30 300 10 Good 43 Example 19 Shading pattern side 9.6 25 300 10 Good 51 Example 20 Shading pattern side 9.6 50 300 10 Good 59 Example 21 Shading pattern side 9.6 30 200 10 Good 57 Example 22 Shading pattern side 9.6 30 500 10 Good 49 Example 23 Shading pattern side 9.6 30 300 5 Good 51 Example 24 Shading pattern side 9.6 30 300 20 Good 48 Example 25 Shading pattern side 9.3 70 300 9 Good 61 Example 26 Shading pattern side 9.3 95 300 9 Good 64 Example 27 Shading pattern side 9.3 30 700 9 Good 56 Example 28 Shading pattern side 9.3 30 950 9 Good 54 Example 29 Hard coating side 9.3 30 300 30 Good 51 Example 30 Hard coating side 9.3 30 300 45 Good 49 Comparative Example 1 Hard coating side 9.3 105 300 9 Bad 172 Comparative Example 2 Hard coating side 9.3 50 1100 9 Bad Not cut Comparative Example 3 Shading pattern side 9.6 30 300 55 Bad 132 Comparative Example 4 Shading pattern side 9.3 5 300 9 Bad Not cut

Referring to Table 1, it can be confirmed that the cutting quality of the window substrate obtained by cutting under the conditions of the embodiment is good and the width difference between the upper and lower tapers is small.

However, in the case of cutting under the conditions of the comparative example, it was judged that it was not cut or the difference in the width of the tapered upper and lower surfaces was large and it was defective.

100: base film 200: hard coating layer
300: Shading pattern 1: Laser beam

Claims (14)

A base film, and a hard coating layer on one side of the base film,
And the difference in width between the taper upper surface and the lower surface is less than 80 占 퐉.
[4] The method according to claim 1, wherein the base film is at least one selected from the group consisting of polyethylene terephthalate, polyethylene ether phthalate, polyethylene naphthalate, polycarbonate, polyarylate, polyetherimide, polyether sulfonic acid, polyimide and polyacrylate Wherein the substrate comprises a substrate.
The window substrate according to claim 1, wherein the hard coating layer has a hardness of 2H to 9H.
The window substrate according to claim 1, wherein the hard coat layer side is tapered.
The window substrate according to claim 1, further comprising a shielding pattern on a non-display portion of the other surface of the base film.
The window substrate according to claim 5, wherein the hard coating layer side is tapered.
An optical laminate having a window substrate according to any one of claims 1 to 6.
The optical laminate according to claim 7, further comprising a polarizer or a touch sensor on the lower side of the window substrate.
The optical laminate according to claim 7, further comprising a polarizer-integrated touch sensor on the lower side of the window substrate.
Cutting a raw paper substrate film having a hard coating layer on one surface thereof with a laser having a wavelength of 9.3 to 9.6 占 퐉, an output of 10 to 100 W, a speed of 10 to 1,000 mm / s, and a pulse repetition rate of 1 to 50 kHz.
[10] The method of claim 10, wherein the base film is at least one selected from the group consisting of polyethylene terephthalate, polyethylene ether phthalate, polyethylene naphthalate, polycarbonate, polyarylate, polyetherimide, polyether sulfonic acid, polyimide and polyacrylate Wherein the method comprises the steps of:
11. The method of claim 10, wherein the hard coating layer has a hardness of 2H to 9H.
11. The method of manufacturing a window substrate according to claim 10, wherein the base film further comprises a shielding pattern on a non-display portion of the other surface.
The method of manufacturing a window substrate according to any one of claims 10 to 13, wherein the laser beam is irradiated to the side of the base substrate film.

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