KR20190018215A - Cover window and display device comprising the same - Google Patents

Abstract

The present invention relates to a cover window for a display having enhanced reliability, hardness and durability, and a display device comprising the same. The cover window for a display comprises: a soft substrate including one side and the other side opposite to the one side; a first hardness layer disposed on one side of the soft substrate and including a plurality of engraved patterns and embossed patterns placed between the plurality of engraved patterns; and a second hardness layer disposed within the engraved patterns of the first hardness layer, wherein the hardness of the second hardness layer is greater than the hardness of the first hardness layer, and the second hardness layer is disposed extending in at least two directions intersecting with each other.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cover window for a display,

Embodiments relate to a cover window for a display and a display device including the same.

2. Description of the Related Art [0002] In recent years, various electronic products have been applied to a display device in which an input device such as a finger or a stylus is brought into contact with an image displayed on a display device.

In one example, such a display device can be applied to a touch device device by contact with an input device or the like.

Such a touch device device can be largely divided into a resistive film type and a capacitive type. In the resistive touch device, the glass and the electrode are short-circuited by the pressure of the input device and the position is detected. In the case of the electrostatic capacity type, a self cap method in which the capacitance of the electrode changes when a finger touches, or a mutual cap method in which capacitance between the electrodes changes, .

In recent years, there is an increasing interest in flexible flexible touch windows or foldable touch windows.

In the case of such a flexible touch window or a folder-type touch window, it can be bent or folded in one direction or another direction using a cover window for a display that can be folded.

To implement such a flexible or foldable, the cover window for the display may use a flexible substrate other than a rigid material. In order to compensate the strength of such a soft substrate, a protective layer such as a hard coat layer may be disposed on one side or both sides of the soft substrate.

In the case of such a protective layer, it may include a resin material which is cured by light. Generally, in the case of a resin material having a high crosslinking density, the hardness of the protective layer can be improved, but the hardness is improved and the water side is increased to cause defects such as curl on the surface of the protective layer, Is transferred to the soft substrate, cracks or the like are generated in the soft substrate upon bending or folding, and the soft substrate is torn.

Accordingly, there is a need for a display cover window of a new structure capable of solving the above problems and a display device including the same.

The embodiments are directed to providing a cover window for a display having improved reliability, hardness and durability.

A cover window for a display according to an embodiment of the present invention includes: a flexible substrate including a first surface and a second surface opposite to the first surface; A first hardness layer disposed on one side of the soft substrate and including a plurality of engraved patterns and a relief pattern disposed between the engraved patterns; And a second hardness layer disposed within the engraved pattern of the first hardness layer, wherein the hardness of the second hardness layer is greater than the hardness of the second hardness layer, and the second hardness layer Extending in at least two directions.

A cover window for a display according to an embodiment may include a first hardness layer and a second hardness layer disposed on a soft substrate.

An engraved pattern may be formed in the first hardness layer, and the second hardness layer may be disposed in the engraved pattern.

The first hardness layer may have lower cross-link density and elastic modulus than the second hardness layer. That is, the hardness of the first hardness layer may be smaller than that of the second hardness layer.

The first hardness layer is disposed in contact with one surface of the soft substrate to prevent cracking and tearing of the soft substrate 100 when the display cover window is bending or folding.

The second hardness layer 220, which has a higher cross-link density and a higher Young's modulus than the first hardness layer, is disposed in a meshed shape in the engraved pattern of the first hardness layer, so that the hardness and durability Can be improved.

That is, the first hardness layer is disposed between the second hardness layers, and can serve as a buffer layer for relieving the stress of the second hardness layer, which shrinks sharply during curing, from being transmitted to the soft substrate, Cracking and tearing of the soft substrate can be prevented when the window is bending or folding.

In addition, since the second hardness layer has a hardness and an elastic modulus greater than that of the first hardness layer, the overall hardness and durability of the display cover window can be improved.

That is, the cover window for a display according to the embodiment can have improved reliability by preventing deformation such as cracking or tearing of the flexible substrate when bending or folding, with improved hardness and water resistance.

1 is a perspective view of a cover window for a display according to an embodiment.
2 and 3 are top views of a first hardness layer of a cover window for a display according to an embodiment.
4 and 5 are top views of the hardness layer of a cover window for a display according to an embodiment.
6 is a cross-sectional view of a first hardness layer of a cover window for a display according to an embodiment.
FIGS. 7 to 9 are cross-sectional views taken along the line AA 'in FIG.
10 and 11 are diagrams illustrating other cross-sectional views of a hardness layer of a cover window for a display according to an embodiment.
FIG. 12 is another cross-sectional view cut along the line AA 'in FIG.
13 is a cross-sectional view of a display device to which a cover window according to the embodiment is applied.
14 and 15 are views showing an example of a display device according to the embodiments.

In the description of the embodiments, it is to be understood that each layer (film), area, pattern or structure may be referred to as being "on" or "under / under" Quot; includes all that is formed directly or through another layer. The criteria for top / bottom or bottom / bottom of each layer are described with reference to the drawings.

Also, when a part is referred to as being "connected" to another part, it includes not only a case of being "directly connected" but also a case of being "indirectly connected" with another member in between. Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, a cover window for a display according to an embodiment will be described with reference to the drawings.

Referring to FIGS. 1 to 6, a cover window for a display according to an embodiment may include a soft substrate 100.

The soft substrate 100 may include a transparent material. The flexible substrate 100 may include a flexible material. For example, the soft substrate 100 may comprise a transparent plastic material.

For example, the soft substrate 100 may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polycarbonate (PC), polystyrene (PS), polyethersulfone And at least one of the resins.

The thickness T1 of the soft substrate 100 may be about 100 탆 or less. In detail, the thickness of the soft substrate 100 may be about 20 탆 to about 100 탆. More specifically, the thickness of the soft substrate 100 may be about 50 탆 to about 100 탆.

If the thickness of the soft substrate 100 is less than about 20 탆, the overall strength of the cover window may be lowered and the reliability of the display device to which the cover window is applied may be deteriorated.

When the thickness of the soft substrate 100 is more than about 100 mu m, cracks are generated in the soft substrate 100 when the display device to which the cover window is applied is bent in one direction according to the thickness of the soft substrate 100 And the reliability of the display device may be deteriorated.

The soft substrate 100 may include a first surface 100a and a second surface 100b opposite to the first surface 100a.

Although the flexible substrate 100 is shown in FIG. 1 as being rectangular, it is not limited thereto. The flexible substrate 100 may include a curved surface or various polygonal Or the like.

The direction of the X axis (first axis), the axis of Y axis (second axis), and the axis of Z axis (third axis) may be defined in the soft substrate 100. For example, the X-axis corresponds to the lateral direction of the soft substrate, the Y-axis corresponds to the longitudinal direction of the soft substrate, and the Z-axis corresponds to the thickness (i.e., height) direction of the soft substrate.

2 to 6, the hardness layer 200 may be disposed on at least one surface of one side or the other side of the soft substrate 100. That is, the hardness layer 200 may be disposed on one surface or the other surface of the soft substrate 100, or may be disposed on one surface and the other surface of the soft substrate 100.

Hereinafter, an example in which the hardness layer 200 is disposed on one surface of the soft substrate 100 will be mainly described.

The hardness layer 200 may include a first hardness layer 210 and a second hardness layer 220.

The first hardness layer 210 may be disposed on one surface 100a of the soft substrate 100. [ The first hardness layer 210 may be disposed in contact with the first surface 100a of the soft substrate 100. The first hardness layer 210 may be directly contacted with the first surface 100a of the soft substrate 100, And can be placed in contact.

The thickness T2 of the first hardness layer 210 may be less than about 40 um. In detail, the thickness T2 of the first hardness layer 210 may be about 10 um to about 40 um. The thickness T2 of the first hardness layer 210 may be greater than the thickness T2 of the first hardness layer 210 formed on the first hardness layer 210, As shown in FIG.

The first hardness layer 210 may include a plurality of patterns. In detail, the first hardness layer 210 may include a plurality of engraved patterns P1 having an engraved depth in the depth direction of the first hardness layer 210.

The engraved pattern P1 may be formed on a surface of the first hard layer 210 opposite to the first surface 100a of the soft substrate 100. That is, the engraved pattern P1 may be formed on the surface of the first hardness layer 210 opposite to the surface of the first hardness layer 210 facing the soft substrate 100. Here, the engraved pattern P1 may be a blind hole formed in the first hardness layer 210, that is, a blind hole. Here, the engraved pattern P1 may be defined as a groove formed in the first hardness layer 210. That is, the engraved pattern P1 may be defined as a groove region formed in the first hardness layer 210, not a hole passing through the first hardness layer 210.

The engraved pattern P1 may be formed to extend in at least two directions. In detail, the engraved pattern P1 may be formed extending in two directions intersecting with each other. For example, the engraved pattern P1 may extend in the first axis direction and the second axis direction. In detail, the engraved pattern P1 may extend in a first axis direction and a second axis direction intersecting with each other.

The engraved patterns P1 may be formed by an imprinting process using a mold after the first hardness layer 210 is disposed on one side of the soft substrate 100

The first hardness layer 210 may form an inner surface L and a bottom surface B defined by the interior of the engraved pattern P1 by the engraved pattern P1.

The engraved patterns P1 may be regularly arranged. Alternatively, the engraved patterns P1 may be randomly arranged.

The engraved patterns P1 may include at least one pattern.

In detail, referring to FIG. 2, the plurality of engraved patterns P1 may be formed as one pattern connected to each other. That is, the plurality of engraved patterns P1 may be integrally formed. In detail, the engraved patterns P1 may be formed in a mesh shape as a whole.

Alternatively, referring to FIG. 3, the plurality of engraved patterns P1 may be formed of a plurality of patterns spaced apart from each other. That is, each of the patterns may be formed extending in the first axis direction and the second axis direction intersecting with each other, and each of the patterns may be disposed apart from each other.

2 and 3, only the engraved pattern extending in two directions is shown. However, the present invention is not limited thereto, and the engraved patterns may be formed to extend in three or more directions which do not intersect or intersect with each other. In addition, the area, shape, interval, or shape of each engraved pattern may be the same or different from each other. Specifically, the area of the engraved pattern may be increased or decreased in any direction. Or the area, shape, spacing, etc. of the engraved pattern may increase or decrease, or may vary regularly or irregularly, such as varying the shape of each engraved pattern.

The first hardness layer 210 is formed with a plurality of embossing patterns P1 and a plurality of embossing patterns P2 disposed between the adjacent embossing patterns P1 by the engraved patterns P1, .

The height h1 of the engraved pattern P1 may be about 50% or more of the thickness of the first hardness layer 210. In detail, the height h1 of the engraved pattern P1 may be about 50% to 75% of the thickness of the first hardness layer 210.

The first hardness layer 210 may have a thickness ranging from the lower surface of the first hardness layer 210 contacting the soft substrate 100 to the upper surface opposite to the lower surface of the first hardness layer 210, Height. ≪ / RTI >

The height h1 of the engraved pattern P1 may be less than the thickness of the first hardness layer 210. For example, the height h1 of the engraved pattern P1 may be less than about 100 탆 . In detail, the height h1 of the engraved pattern P1 may be about 10 탆 to about 100 탆. More specifically, the height h1 of the engraved pattern P1 may be about 10 탆 to about 35 탆, and the height h1 of the engraved pattern P1 may be within the range of the first hardness layer 210 It can be changed depending on the thickness. In detail, when the first hardness layer 210 has a thickness of about 40 um or less, the height h1 of the engraved pattern P1 is about 50% to 75% of the thickness of the first hardness layer 210, When the height of the engraved pattern P1 is greater than about 100 mu m thereafter, when the second hardness layer 220 is filled into the engraved pattern P1, the surface of the second hardness layer P1, Leveling may be degraded.

In addition, the width W of the engraved pattern P1 may be about 100 탆 or less. In detail, the width W of the engraved pattern P1 may be about 5 占 퐉 to about 50 占 퐉.

When the width of the engraved pattern P1 is greater than about 100 탆, the surface leveling of the second hardness layer is lowered when the second hardness layer 220 is filled into the engraved pattern P1 .

In addition, the interval I of the engraved patterns P1 may be about 1 mm or less. In detail, the interval (I) of the engraved patterns P1 may be about 180 탆 to about 200 탆.

In addition, the interval I of the engraved patterns P1 may be larger than the width W of the engraved patterns P1. In detail, the size ratio of the interval I of the engraved patterns P1 to the width W of the engraved patterns P1 may be about 10: 1 to 5: When the second hardness layer 220 is disposed in the interior of the second hardness layer, voids and the like in the engraved pattern can be minimized, and air or the like can be prevented from penetrating into the second hardness layer.

The first hardness layer 210 may be transparent. The first hardness layer 21 may comprise a resin material. The first hardness layer 210 may include a photocurable resin material. The first hardness layer 210 may include a material having a low crosslink density. The modulus of elasticity of the first hardness layer 210 may be about 1.5 GPa or less. For example, the first hardness layer 210 may include an acrylate resin material.

The second hardness layer 220 may be disposed on the first hardness layer 210. The second hardness layer 220 may be disposed inside the engraved pattern P1 of the first hardness layer 210. [ That is, the second hardness layer 220 may not be in contact with the soft substrate 100. That is, the second hardness layer 220 may be disposed apart from the soft substrate 100.

The arrangement of the second hardness layer 220 may correspond to the shape of the engraved pattern P1. In detail, the second hardness layer 220 may be arranged in the same or similar shape as the shape of the engraved pattern P1. In detail, the shape of the second hardness layer 220 and the engraved pattern P1 may correspond to each other. In detail, the shape of the second hardness layer 220 and the engraved pattern P1 may be arranged in the same or similar mesh shape. The second hardness layer 220 is arranged in a mesh shape or the like in a shape similar to or similar to the engraved pattern so that the entire surface of the soft substrate 100, Can be uniformly improved.

The second hardness layer 220 may be transparent. The second hardness layer 220 may include a resin material. The second hardness layer 210 may include a material having a high cross-linking density. In detail, the second hardness layer 220 may include a material having a higher cross-linking density than the first hardness layer 210.

The modulus of elasticity of the second hardness layer 220 may be greater than the modulus of elasticity of the first hardness layer 210. In detail, the modulus of elasticity of the second hardness layer 220 may be at least about 2 GPa.

The second hardness layer 220 may be greater than the hardness of the first hardness layer 210. In detail, the second hardness layer may comprise an acrylic resin and / or a urethane resin.

The second hardness layer 220 may be formed of a resin composition comprising a resin material, a photoinitiator, a crosslinkable monomer, and an additive.

In detail, the resin material, the photoinitiator, the crosslinkable monomer and the additive may be mixed with a solvent such as propylene glycol monomethyl ether (PGME) to form a resin composition.

The resin material may include at least one resin material selected from an acrylic resin and a urethane resin.

In addition, the photoinitiator may comprise a photoinitiator material that cures the crosslinkable functional group.

In addition, the resin composition may include a crosslinkable monomer. For example, the resin composition may further include a crosslinkable monomer having at least one of an acrylate group, an epoxy group and an oxetane group. The hardness of the reinforcing layer can be improved by the crosslinking monomer.

Further, the resin composition may further include an additive. For example, the resin composition may further comprise silica particles (SiO2). The silica particles may be dispersed and disposed in the resin composition.

The hardness of the second hardness layer can be improved by the silica particles.

The silica particles may have a particle size of nano unit. The silica particles may have a particle diameter of about 100 nm or less. In detail, the silica particles may have a particle diameter of about 10 nm to 100 nm.

When the particle diameter of the silica particles exceeds about 100 nm, the dispersibility of the silica particles may be lowered, and the light may be refracted by the silica particles to increase the haze of the cover window.

The silica particles may be included in an amount of about 10% by weight to about 65% by weight based on the entire resin composition. In detail, the silica particles may be contained in an amount of 30% by weight to 65% by weight based on the entire resin composition. If the silica particles are included at less than about 10% by weight, the hardness of the second hardness layer may be lowered. In addition, when the silica particles are contained in an amount of more than about 65% by weight, the hardness can be improved, but the bending property is lowered, and when the cover window is bent, a crack may be generated in the second hardness layer.

The amount of the first hardness layer 210 and the second hardness layer 220 disposed on the soft substrate 100 may be different. In detail, the amount of the second hardness layer 220 may be greater than the amount of the first hardness layer 210. The area of the second hardness layer 220 may be larger than the area of the first hardness layer 210.

The weight percent of the first hardness layer 210 is greater than the weight percent of the second hardness layer 220 with respect to the entire hardness layer including the first hardness layer 210 and the second hardness layer 220. [ Lt; / RTI >

The first hardness layer 210 may have lower cross-link density and elastic modulus than the second hardness layer 220. That is, the first hardness layer 210 may have a smaller shrinkage than the second hardness layer 220 when cured. For this, the second hardness layer 220 may include a ceramic-based material such as silica as described above, and the first hardness layer 210 may not include a ceramic-based material. Alternatively, the second hardness layer 220 may include a relatively large percentage by weight or volume of ceramic-based material relative to the first hardness layer 210.

The first hardness layer 210 is disposed in contact with one surface of the soft substrate 100 to prevent cracking and tearing of the soft substrate 100 when bending or folding the display cover window. can do.

The second hardness layer 220, which has a higher cross-link density and a higher Young's modulus than the first hardness layer 210, is disposed in a meshed shape in the engraved pattern of the first hardness layer, And durability can be improved.

That is, the first hardness layer 210 is disposed between the second hardness layers 220 to prevent the stress of the second hardness layer 220, which has a large shrinkage upon curing, from being transmitted to the soft substrate, And it is possible to prevent cracking and tearing of the soft substrate 100 when the cover window for display is bending or folding.

In addition, since the second hardness layer 220 has greater hardness and elastic modulus than the first hardness layer 210, the overall hardness and durability of the display cover window can be improved.

That is, the cover window for a display according to the embodiment can have improved reliability by preventing deformation such as cracking or tearing of the flexible substrate when bending or folding, with improved hardness and durability.

In addition, since the display cover window has a structure in which the first hardness layer is disposed at a partial height between the two hardness layers, the vertical directional interface between the different materials can be reduced, and when the display cover window is applied to a display panel or the like Since index matching is easy, visibility can be improved.

Referring to FIGS. 7 to 9, the second hardness layer 220 may be disposed while filling the interior of the engraved pattern P. FIG.

The second hardness layer 220 may be formed by printing a resin composition that forms the second hardness layer 220 on the first hardness layer 220.

Referring to FIG. 7, the second hardness layer 220 may be disposed only inside the engraved pattern P1. The height h2 of the second hardness layer 220 may be less than the height h1 of the engraved pattern P1. In detail, the maximum height h2a and the minimum height h2b of the second hardness layer 220 may be smaller than the height h1 of the engraved pattern P1.

The maximum height h2a of the second hardness layer 220 may be defined as the distance from the bottom surface B of the engraved pattern to the maximum top surface of the second hardness layer 220. [ The minimum height h2b of the second hardness layer 220 may be defined as the distance from the bottom surface B of the engraved pattern to the lowest top surface of the second hardness layer 220. [

For example, when the second hardness layer 220 is disposed inside the engraved pattern P1 and then hardened, the second hardness layer 220 is contracted, so that the hardness of the second hardness layer 220 The maximum height h2a and the minimum height h2b may be smaller than the height h1 of the engraved pattern P1. In detail, the second hardness layer 220 may be disposed at a height of about 90% to 97% with respect to the height h1 of the engraved pattern P1.

That is, the second hardness layer 220 may be disposed in contact with the bottom surface and the inner surface of the engraved pattern P inside the engraved pattern P. The upper surface 220a of the second hardness layer 220, which is opposite to the surface contacting the bottom surface of the engraved pattern P, may include a convex surface. The convex surface may include a curved surface.

Referring to FIG. 8, the second hardness layer 220 may be disposed on the inner surface of the engraved pattern P1 and on the partial surface of the upper surface of the relief pattern P2. In detail, the second hardness layer 220 may be disposed on a portion of the upper surface of the relief pattern P2, which is connected to the interior of the relief pattern P and the inner surface of the relief pattern.

The height h2 of the second hardness layer 220 may be greater or less than the height h1 of the engraved pattern P1. The maximum height h2a of the second hardness layer 220 may be greater than the height h1 of the engraved pattern P1 and the minimum height h2b may be greater than the height h1 of the engraved pattern P1, .

The maximum height h2a of the second hardness layer 220 may be defined as the distance from the bottom surface B of the engraved pattern to the maximum top surface of the second hardness layer 220. [ The minimum height h2b of the second hardness layer 220 may be defined as the distance from the bottom surface B of the engraved pattern to the lowest top surface of the second hardness layer 220. [

For example, when the second hardness layer 220 is disposed inside the engraved pattern P1 and then hardened, the second hardness layer 220 is contracted, so that the hardness of the second hardness layer 220 The minimum height h2b may be smaller than the height h1 of the engraved pattern P1. In detail, the minimum height h2b of the second hardness layer 220 may be about 90% to 97% of the height h1 of the engraved pattern P1.

The maximum height h2a of the second hardness layer 220 in the printing process of the second hardness layer 220 is higher than the height h1 of the engraved pattern P1, 220 may be disposed while partially covering the upper surface of the relief pattern P2.

That is, the second hardness layer 220 may be disposed in contact with the bottom surface and the inner surface of the engraved pattern P, and the partial surface of the upper surface of the relief pattern P2 connected to the inner surface of the engraved pattern. have. In addition, the upper surface of the second hardness layer 220 opposite to the surface contacting the bottom surface of the engraved pattern P may include a convex surface. The convex surface may include a curved surface.

Referring to FIG. 9, the second hardness layer 220 may be disposed on the upper surface of the relief pattern P2 and the interior of the relief pattern P1. In detail, the second hardness layer 220 may be disposed on both the interior of the engraved pattern P and the upper surface of the relief pattern P2.

The height h2 of the second hardness layer 220 may be greater or less than the height h1 of the engraved pattern P1. The maximum height h2a of the second hardness layer 220 may be greater than the height h1 of the engraved pattern P1 and the minimum height h2b may be greater than the height h1 of the engraved pattern P1, . The maximum height h2a of the second hardness layer 220 may be defined as the distance from the bottom surface B of the engraved pattern to the maximum top surface of the second hardness layer 220. [ The minimum height h2b of the second hardness layer 220 may be defined as the distance from the bottom surface B of the engraved pattern to the lowest top surface of the second hardness layer 220. In addition, The thickness T3 of the second hardness layer 220 disposed on the concave portion P2 may be smaller than the thickness of the second hardness layer 220 disposed inside the engraved pattern P1.

For example, the thickness T3 of the second hardness layer 220 disposed on the relief pattern P2 may be between about 2 um and about 5 um.

That is, the second hardness layer 220 may be disposed in contact with the bottom surface and the inner surface of the engraved pattern P and the top surface of the relief pattern P2. The upper surface of the second hardness layer 220, which is opposite to the surface contacting the bottom surface of the engraved pattern P, may include a convex surface. The convex surface may include a curved surface.

In the case of FIG. 9, since the second hardness layer is disposed on the upper surface of the first hardness layer while covering the engraved pattern of the first hardness layer, a protective layer such as an additional hard coat layer for compensating the strength is formed The process can be omitted.

10 and 11, various cover windows according to positions of the first hardness layer and the second hardness layer will be described.

Referring to FIG. 10, the first hardness layer 210 may be disposed on one surface 100a of the soft substrate 100. In addition, the second hardness layer 220 may be disposed on the upper surface of the first hardness layer 210.

That is, unlike the above-described embodiment, the display cover window of FIG. 10 has a structure in which the second hardness layer 220 is formed directly on the upper surface of the first hardness layer without forming the engraved pattern on the first hardness layer 210, Can be arranged.

The second hardness layer 220 may be disposed in a mesh shape. The thickness of the second hardness layer 220 may be greater than the thickness of the first hardness layer 210.

The display cover window according to the embodiment of FIG. 10 can arrange the second hardness layer without forming the engraved pattern on the first hardness layer, unlike the embodiment described above. Thus, it is unnecessary to increase the thickness of the first hardness layer in order to form the second hardness layer having a sufficient amount and area, so that the overall thickness of the cover window for display can be reduced.

Referring to FIG. 11, the first hardness layer 210 may be disposed on one surface 100a of the soft substrate 100. In addition, the second hardness layer 220 may be disposed on the upper surface of the first hardness layer 210.

In other words, the display cover window of FIG. 11 is different from the previously described embodiment in that the second hardness layer 220 is formed directly on the upper surface of the first hardness layer without forming the engraved pattern on the first hardness layer 210, Can be arranged.

The second hardness layer 220 may be disposed in a mesh shape. The thickness of the second hardness layer 220 may be greater than the thickness of the first hardness layer 210.

Also, a dummy layer 230 may be disposed between the second hardness layers 220. The dummy layer 230 may include a material similar to the second hardness layer 220. The dummy layer 230 may include a material having a refractive index similar to that of the second hardness layer 220. The dummy layer 230 may be formed in the same or similar shape as the second hardness layer 220. The dummy layer 230 may be disposed in contact with the second hardness layer 220.

The display cover window according to the embodiment of FIG. 11 can arrange the second hardness layer without forming the engraved pattern on the first hardness layer, unlike the embodiments described above. Thus, it is unnecessary to increase the thickness of the first hardness layer in order to form the second hardness layer having a sufficient amount and area, so that the overall thickness of the cover window for display can be reduced.

In addition, since a dummy layer having a refractive index similar to that of the second hardness layer 220 is disposed between the second hardness layers 220, the pattern of the second hardness layer can be prevented from being visually recognized, Visibility can be improved.

The display cover window described above may be formed by defining a plurality of unit cover windows in a cover window of the standard and arranging the first and second hardness layers in the respective unit cover windows. That is, after forming the first and second hardness layers, the final unit cover windows can be manufactured by cutting each unit cover window.

At this time, only the first hardness layer may be included in the rim portion of the cover window for display by cutting the portion without the engraved portion of the first hardness layer. That is, the first hardness layer of the rim portion of the cover window may have a thickness only by the distance from the surface of the first hardness layer facing the soft substrate to the upper surface of the first hardness layer.

Referring to FIG. 12, a cover window for a display according to an embodiment may further include a protection layer 300. For example, the protective layer 300 may be a surface hardening layer, a hard coating layer, or the like, which enhances the surface strength of the cover window for a display.

In detail, the protective layer 300 may be disposed on the other surface of the soft substrate 100. That is, the first hardness layer 210 and the second hardness layer 220 are disposed on one surface of the soft substrate 100, and the protective layer 300 may be disposed on the other surface of the soft substrate 100 .

The passivation layer 300 may include the same or similar material as the second hardness layer 220. For example, the protective layer 300 may include a resin material having a higher crosslinking density and elastic modulus than the first hardness layer 220.

The thickness T4 of the protective layer 300 may be less than or equal to the thickness of the first hardness layer 210. In other words, the thickness of the first hardness layer 210 may be greater than the thickness of the protective layer 300.

If the thickness T4 of the protective layer 300 is greater than or equal to the thickness of the first hardness layer 210, bending and folding of the display cover window may be limited by the thickness of the protective layer. The protective layer 300 is disposed on the other surface of the soft substrate 100 but the protective layer 300 may be formed on one surface of the soft substrate 100, The hardness layer and the upper surface of the second hardness layer.

Hereinafter, a display device including a cover window for a display according to the above-described embodiments will be described with reference to FIG. In the description of the display device according to the embodiment, the same or similar components as those of the cover window according to the above-described embodiments will not be described, and the same reference numerals are assigned to the same components.

Referring to FIG. 13, the display device according to the embodiment may include a display panel 900 and a cover window 1000 disposed on the display panel 900.

The cover window 1000 may include a valid area AA and a non-valid area UA. The display may be displayed in the effective area AA and the display may not be displayed in the non-valid area UA disposed around the valid area AA.

The display panel 900 may be flexible. The display panel 900 may include a liquid crystal display panel or an organic light emitting display panel.

In detail, the display panel 900 may include an organic light emitting display panel.

In detail, the display panel 900 may include an organic light emitting (OLED) display panel including a self-luminous element not requiring a separate light source. Alternatively, the self-luminous element may include a plastic organic electroluminescent (POLED) display panel including a plastic self-luminous element including a plastic material having good elasticity.

For example, the display panel 900 may include a thin film transistor formed on a substrate, and an organic light emitting device contacting the thin film transistor may be formed. The organic light emitting device may include an anode, a cathode, and an organic light emitting layer formed between the anode and the cathode. The organic light emitting device may further include another substrate serving as an encapsulation substrate for encapsulation.

In the case of plastic organic electroluminescence (POLED), the sealing film of the organic material may be formed into a multilayer structure, and the layers may be formed of a repeating laminate structure composed mainly of an organic material or an inorganic material.

13, a display device according to an exemplary embodiment of the present invention includes a cover window 1000 and a decor layer 400 and a reinforcing layer 500 disposed between the display panel 900 and a reinforcing layer 500 disposed under the reinforcing layer 500 The polarizing layer 600 and the touch panel 700 as shown in FIG.

The decor layer 400 may be disposed on the cover window 1000. In detail, the decor layer 400 may be disposed on the ineffective area UA. In detail, the decor layer 400 may be disposed in contact with the cover window 1000 on the ineffective area UA.

The decor layer 400 is formed by applying a material having a predetermined color so that the wiring electrode disposed on the ineffective area and the printed circuit board connecting the wiring electrode to an external circuit can not be seen from outside .

The decor layer 400 may have a color suitable for a desired appearance. For example, the decor layer 400 may include black or white pigment, and may represent black or white. Or various color films can be used to display various color colors such as red, blue, and the like.

A desired logo or the like may be formed on the decor layer 400 by various methods. The decor layer 400 may be formed by vapor deposition, printing, wet coating, or the like.

The decor layer 400 may be disposed in at least one layer. For example, the decor layer 400 may be disposed in one layer or in at least two layers having different widths.

The stiffening layer 500 may be disposed on the cover window 1000. In detail, the reinforcing layer 500 may be disposed on the effective area AA and the non-valid area UA. In detail, the stiffening layer 500 may be disposed in contact with the cover window 1000 on the effective area AA and in contact with the decor layer 400 on the non-valid area UA.

The reinforcing layer 500 may flatten the lower surface of the cover window 1000 where the decor layer 400 is disposed. That is, the reinforcing layer 500 may be disposed on the lower surface of the foldable substrate 1000 so as to surround the decor layer, thereby removing a step corresponding to the decor layer. That is, the reinforcing layer 500 may be a planarizing layer.

A polarizing layer 600 and a touch panel 700 may be disposed under the reinforcing layer 500.

The polarizing layer 600 may be a polarizing film. The polarizing layer 600 may be a colored film. For example, the polarizing film 600 may be a black film. The thickness of the polarizing layer 600 may be about 5 탆 or less. In detail, the thickness of the polarizing layer 600 may be about 2 탆 or less.

The polarizing layer 600 may include an alignment layer and a liquid crystal dye layer on the alignment layer. The liquid crystal dye layer is composed of liquid crystal molecules having two different dyes having different colors. Since the liquid crystal molecules in the liquid crystal dye layer have dichroism, they absorb light oscillating in the stretching direction and vibrate in a vertical direction Light may have a function of transmitting light. Further, the dichroic dye incorporated in the liquid crystal dye layer may include iodine.

A touch panel 700 may be disposed below the polarizing layer 600. The touch panel 700 may include a sensing electrode. For example, the touch panel 700 may include a first sensing electrode and a second sensing electrode that extend in directions intersecting with each other.

Accordingly, it is possible to sense the position of an input device (e.g., a finger or a stylus pen) in the display area or the like. When an input device such as a finger is brought into contact with the cover window 1000 in detail, a capacitance difference occurs between the first and second sensing electrodes at a portion where the input device is contacted, Can be detected

A display panel 900 may be disposed below the touch panel 700. An adhesive layer 800 may be disposed between the touch panel 700 and the display panel 900 and the touch panel 700 and the display panel 900 may be adhered to each other by the adhesive layer 800.

Hereinafter, an example of a touch device device to which the display device according to the above-described embodiments is applied will be described with reference to FIGS. 14 to 15. FIG.

14 and 15, the touch device device may also include a flexible device that is bent or folded. Accordingly, the touch device device including the same may be a flexible touch device device. Therefore, the user can bend or bend by hand. Such a flexible touch device can be applied to a wearable touch such as a smart watch.

The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments may be modified and implemented. It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

Claims (14)

A soft substrate including a first surface and a second surface opposite to the first surface; And
A first hardness layer and a second hardness layer disposed on one side of the soft substrate,
Wherein the first hardness layer includes a plurality of engraved patterns formed on a surface opposite to the one surface and embossed patterns disposed between the engraved patterns,
Wherein the second hardness layer is disposed within the engraved patterns of the first hardness layer,
The hardness of the second hardness layer is greater than the hardness of the first hardness layer,
Wherein the second hardness layer extends in at least two directions intersecting with each other. The method according to claim 1,
Wherein the first hardness layer is disposed in contact with one surface of the soft substrate,
And the second hardness layer is disposed apart from one surface of the soft substrate. The method according to claim 1,
Wherein the height of the engraved patterns is from 10 탆 to 100 탆,
Wherein the engraved patterns have a width of 5 mu m to 100 mu m. The method of claim 3,
Wherein the ratio of the width of the engraved patterns to the width of the engraved patterns is 10: 1 to 5: 1. The method according to claim 1,
The elastic modulus of the first hardness layer is 1.5 GPa or less,
Wherein the second hardness layer has a Young's modulus of at least 2 GPa. The method according to claim 1,
Wherein the second hardness layer further comprises silica particles,
Wherein the silica particles have a particle diameter of 10 nm to 100 nm. The method according to claim 1,
And the second hardness layer is disposed on the upper surface of the relief pattern and the interior of the relief pattern. 8. The method of claim 7,
And the second hardness layer disposed inside the engraved pattern is disposed at a height of 90% to 97% with respect to the height of the engraved pattern. 8. The method of claim 7,
Wherein the thickness of the second hardness layer disposed on the upper surface of the relief pattern is 2 占 퐉 to 5 占 퐉. The method according to claim 1,
And a protective layer disposed on the other surface of the soft substrate. 8. The method of claim 7,
Wherein the thickness of the second hardness layer is greater than or equal to the thickness of the protective layer. The method according to claim 1,
Wherein the second hardness layer is disposed in a mesh configuration. A soft substrate including a first surface and a second surface opposite to the first surface;
A first hardness layer disposed on one side of the soft substrate and including a plurality of engraved patterns and a relief pattern disposed between the engraved patterns;
A second hardness layer disposed within the engraved pattern of the first hardness layer; And
And a display panel disposed on the other surface of the soft substrate,
Wherein the hardness of the second hardness layer is greater than the hardness of the second hardness layer,
And the second hardness layer extends in at least two directions intersecting with each other. 11. The method of claim 10,
Wherein the display panel includes an organic light emitting display panel.

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