KR20210019803A - Substrate for display - Google Patents

Abstract

A display substrate according to an embodiment is a display substrate including one surface and the other surface opposite to the one surface and including a first region and a second region. The display substrate is folded so as to face the one surface, the first region is defined as a folding region, the second region is defined as an unfolding region, a first hole penetrating the one surface and the other surface is formed in the first region, the first hole includes an outer region extending in a depth direction from the one surface and the other surface; and an inner region between the outer regions, and the first hole has a size of a first inner diameter in the outer region so as to be larger than that of a size of a second inner diameter in the inner region.

Description

Display board{SUBSTRATE FOR DISPLAY}

The embodiment relates to a substrate for a display.

Recently, there is an increasing demand for a flexible or foldable display device capable of carrying a variety of applications and capable of displaying an image on a larger screen when carrying.

Such a flexible or foldable display may be folded or partially bent when carrying or stored, and may be implemented in an unfolded state when displaying an image. As a result, it is possible to increase the image display area and facilitate the user's portability.

After the flexible or foldable display device is folded or bent, the original restoration process of unfolding it again may be repeated.

That is, since the folding and unfolding operation of the flexible or foldable display device is repeated, the substrate of the flexible or foldable display device is required to have a certain strength and elasticity, and cracks or deformations should not occur in the substrate during such folding and returning. .

Meanwhile, a metal substrate is generally used as a display substrate constituting a flexible or foldable display device. In addition, in the metal substrate, a stress relief pattern such as holes or grooves may be formed in the folding region or the unfolding region of the metal substrate in order to distribute stress due to folding.

For example, after reducing the difference between the external stress and the internal stress of the metal substrate through a slimming process of etching the surface of the metal substrate, the metal substrate partially or completely penetrates through the etching process using DFR or photoresist. Patterns such as grooves or holes can be formed.

However, as the slimming process and the etching process are sequentially performed, and the upper and lower processes of the metal substrate are respectively performed, a difference in the degree of slimming and etching of the upper and lower portions of the metal substrate may occur. , Due to the difference in residual stress in the upper and lower portions, a curl phenomenon in which the metal substrate is curled may occur.

Therefore, there is a need for a metal substrate having a new structure capable of facilitating the process and maintaining flatness.

An embodiment is to provide a metal substrate having improved flatness and a foldable display including the same.

A display substrate according to an embodiment is a display substrate including one surface and the other surface opposite to the one surface, and including a first region and a second region, wherein the display substrate is folded to face the one surface, The first region is defined as a folding region, the second region is defined as an unfolded region, a first hole penetrating through the one surface and the other surface is formed in the first region, and the first hole is the one surface and the other surface. An outer region extending from the to depth direction; And an inner region between the outer regions, wherein the first hole has a first inner diameter size in the outer region larger than a second inner diameter size in the inner region.

A method for forming a pattern for a display according to an exemplary embodiment includes: preparing a metal substrate including one surface and the other surface; Forming grooves on the one side and the other side by partially irradiating the laser to the metal substrate; And irradiating a laser to the metal substrate as a whole, and the grooves formed on the one surface and the grooves formed on the other surface are formed to overlap each other.

A display device according to an embodiment includes: a display substrate; And at least one of a display panel and a touch panel disposed on the display substrate, wherein the display substrate includes one surface and the other surface opposite to the one surface, and the display substrate faces the one surface. A first area that is folded so as to be viewed, and the display substrate is defined as a folding area; And a second region defined as an unfolding region, wherein a first hole penetrating through the one and the other surfaces is formed in the first region, and the first hole is an outer region extending in a depth direction from the one and the other surfaces. ; And an inner region between the outer regions, wherein the first hole has a first inner diameter size in the outer region larger than a second inner diameter size in the inner region.

In the display substrate according to the embodiment, when the holes are formed, an outer region having a high residual stress is formed larger than an inner region having a relatively low residual stress, that is, formed by etching more. The stress difference can be alleviated.

Accordingly, the display substrate according to the exemplary embodiment minimizes warpage or bending of the display substrate due to a difference in stress between the surface layer and the inner layer, thereby improving flatness and reliability of the display substrate.

In addition, in the display substrate according to the exemplary embodiment, a slimming process for etching a surface layer of the substrate and an etching process for forming a hole in the substrate may be simultaneously performed. In detail, a slimming process of partially etching a surface layer of a metal substrate to reduce residual stress of a metal substrate by a single laser irradiation, and an etching process of a pattern hole for distributing stress due to folding may be simultaneously performed.

Accordingly, in the display substrate according to the embodiment, a plurality of processes may not be performed step by step, and exposure, development, and etching processes may be omitted using a photoresist, and thus process efficiency may be improved.

In addition, while performing a plurality of processes step by step, it is possible to prevent the occurrence of variations in the upper and lower portions of the substrate, thereby preventing the warpage of the substrate, thereby improving the reliability of the display substrate.

1 and 2 are perspective views illustrating a foldable display device according to an exemplary embodiment.
3 is a view showing a perspective view of a substrate for a foldable display according to an embodiment.
4 is a view showing a side view before folding of a substrate for a foldable display according to an embodiment.
5 is a diagram illustrating a side view of a display substrate according to an embodiment after folding.
6 is a view showing a top view of one surface of a substrate for a foldable display according to an embodiment.
7 is a view showing a top view of the other surface of the display substrate according to the embodiment.
FIG. 8 is a diagram illustrating a cross-sectional view taken along area AA′ of FIG. 6.
9 is a diagram illustrating an enlarged view of an enlarged area B of FIG. 8.
10 to 12 are diagrams illustrating a process of forming a pattern of a substrate for a foldable display according to an exemplary embodiment.
13 is a view for explaining an application example of a substrate for a foldable display according to the embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical idea of the present invention is not limited to some embodiments to be described, but may be implemented in various different forms, and within the scope of the technical idea of the present invention, one or more of the constituent elements may be selectively selected between the embodiments. It can be combined with and substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention are generally understood by those of ordinary skill in the art, unless explicitly defined and described. It can be interpreted as a meaning, and terms generally used, such as terms defined in a dictionary, may be interpreted in consideration of the meaning in the context of the related technology.

In addition, terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In the present specification, the singular form may also include the plural form unless specifically stated in the phrase, and when described as “at least one (or more than one) of A and (and) B and C”, it may be combined with A, B, and C. It may contain one or more of all possible combinations.

In addition, terms such as first, second, A, B, (a), and (b) may be used in describing the constituent elements of the embodiment of the present invention. These terms are only for distinguishing the component from other components, and are not limited to the nature, order, or order of the component by the term.

And, when a component is described as being'connected','coupled' or'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also the component and The case of being'connected','coupled', or'connected' due to another element between the other elements may also be included.

In addition, when it is described as being formed or disposed on the “top (top) or bottom (bottom)” of each component, the top (top) or bottom (bottom) is one as well as when the two components are in direct contact with each other. It also includes a case in which the above other component is formed or disposed between the two components.

In addition, when expressed as "upper (upper) or lower (lower)", the meaning of not only an upward direction but also a downward direction based on one component may be included.

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

1 and 2 are perspective views illustrating a foldable display device according to an exemplary embodiment.

Referring to FIG. 1, a foldable display device 1000 according to an exemplary embodiment may include a substrate 100 and a display panel 200 disposed on the substrate 100.

The substrate 100 may support the display panel 200. That is, the substrate 100 may be a support substrate supporting the display panel 200.

The substrate 100 may include a material such as metal. For example, the substrate 100 may include metal, metal alloy, plastic, composite material (eg, carbon fiber reinforced plastic, magnetic or conductive material, glass fiber reinforced material, etc.), ceramic, sapphire, glass, etc. .

The substrate 100 may be flexible or foldable. That is, the substrate 100 may be bent or bent in one direction. That is, the substrate 100 may be a display substrate applied to a flexible display device or a foldable display device.

The substrate 100 may include at least two regions. In detail, the substrate 100 may include a first region 1A and a second region 2A.

The first region 1A may be defined as a region in which the substrate 100 is folded. That is, the first area 1A may be a folding area.

Also, the second region 2A may be defined as a region in which the substrate 100 is not folded. That is, the second area 2A may be an unfolding area.

The first area 1A and the second area 2A will be described in detail below.

The substrate 100 may include an effective area AA and an ineffective area UA. The effective area AA may be defined as an area in which the display panel 200 or the like is disposed, and the ineffective area UA is an area in which the display panel 200 is not disposed, and the effective area ( AA) may be defined as the surrounding area.

The substrate 100 may have a certain thickness. In detail, the substrate 100 may have a thickness of about 0.2 mm or less. In more detail, the substrate 100 may have a thickness of about 0.05 mm to 0.2 mm.

When the thickness of the substrate 100 exceeds about 0.2 mm, cracks may occur due to the thickness of the substrate 100 when folding the display device, and the thickness of the substrate 100 is less than about 0.05 mm. In this case, the strength of the substrate 100 is lowered, and thus the role of the supporting substrate may be difficult.

The display panel 200 may be disposed on the substrate 100. In detail, the display panel 200 may be disposed on the effective area AA of the substrate 100.

The display panel 200 may include a plurality of pixels including a switching thin film transistor, a driving thin film transistor, a power storage device, and an organic light emitting diode (OLED). In the case of an organic light emitting diode, deposition can be performed at a relatively low temperature, and may be mainly applied to a flexible or foldable display device due to low power consumption and high luminance. Here, a pixel refers to a minimum unit for displaying an image, and the display panel displays an image through a plurality of pixels.

The display panel may include a substrate, a gate line disposed on the substrate, a data line insulated from the gate line, and a common power line. In general, one pixel may be defined by a gate line, a data line, and a common power line.

The substrate may include a material having flexible properties such as a plastic film, and the display panel 200 may be implemented by disposing an organic light emitting diode and a pixel circuit on a flexible film.

Referring to FIG. 2, the foldable display device 1000 according to the embodiment may further include a touch panel 300.

The touch panel 300 may be disposed on the display panel 200. In detail, the touch panel 300 may be disposed above the display panel 200 on an area corresponding to the effective area AA of the substrate 100.

The touch panel 300 may implement a touch function in a foldable display device, and in a foldable display device that simply displays an image without a touch function, the touch panel may be omitted.

The touch panel 300 may include a substrate and a touch electrode disposed on the substrate. The touch electrode may sense a position of an input device that is touched on the flexible or foldable display device using a capacitive method or a resistive film method.

The substrate of the touch panel 300 may include a material having flexible properties such as a plastic film, and the touch panel 300 may be implemented by disposing a touch electrode on a flexible film.

Meanwhile, although not shown in the drawings, a cover window for protecting the foldable display device may be additionally disposed above the touch panel 300 or above the display panel 200 (when the touch panel is omitted).

Meanwhile, the substrate 100, the display panel 200, and the touch panel 300 may be adhered to each other through an adhesive layer or the like. In this case, when the substrate 100 and the display panel 200 are bonded, the adhesive layer is not disposed in the first region, that is, the folding region, of the substrate 100, and the adhesive layer is applied only to the second region, that is, the unfolding region. These may be disposed to adhere to each other, or may be adhered by disposing an adhesive layer on the entire surface of the first or second regions.

As described above, the foldable display device includes a substrate 100.

Referring to FIG. 3, the substrate 100 may be bent in one direction.

In detail, the substrate 100 may include one surface 1S and the other surface 2S opposite to the one surface 1S. One surface (1S) of the substrate 100 may be defined as a surface facing the display panel 200, and the other surface (2S) of the substrate 100 is defined as a surface opposite to the one surface (1S). Can be. That is, the display panel 200 may be disposed on one surface 1S of the substrate 100.

The substrate 100 may be bent so that the one surface 1S or the other surface 2S faces each other.

In the following description, as shown in FIG. 3, the one surface 1S of the substrate 100 is bent in a direction facing each other.

As explained earlier. A first area 1A and a second area 2A may be defined in the substrate 100. The first region 1A and the second region 2A may be regions defined when the substrate 100 is bent in a direction in which the one surfaces 1S face each other.

In detail, the substrate 100 is bent in one direction, and the substrate 100 includes a first area 1A that is a folding area (folding area) and a second area that is a non-folding area (unfolding area) ( It can be divided into 2A).

Referring to FIGS. 4 and 5, the substrate 100 may include a first region 1A that is a region where the substrate 100 is bent. Also, the substrate 100 may include a second region 2A that is not bent and is disposed adjacent to the first region 1A.

For example, the second area 2A may be formed on the left and right sides of the first area 1A, respectively, based on the direction in which the substrate 100 is bent. That is, the second region 1A may be disposed at both ends of the first region 1A. That is, the first region 1A may be disposed between the second region 2A.

The first region 1A and the second region 2A may be formed on the same substrate 100. That is, the first region 1A and the second region 2A may be formed integrally with each other without being separated from the same single substrate 100.

The sizes of the first area 1A and the second area 2A may be different from each other. In detail, the size of the second area 2A may be larger than the size of the first area 1A.

In the drawings, the first region 1A is shown to be located in the central portion of the substrate 100, but embodiments are not limited thereto. That is, the first region 1A is formed at one end of the substrate 100 and It can be located in the end area. That is, the first region 1A may be positioned at one end and an end region of the substrate 100 so that the size of the second region 2A is asymmetric.

5 is a side view of the display substrate after the substrate is folded.

Referring to FIG. 5, the substrate 100 may be folded in one direction around a folding axis. In detail, the one surface 1S may be folded in a direction facing each other along a folding axis.

As the substrate 100 is folded in one direction, a first region 1A and a second region 2A may be formed on the substrate 100. That is, a folding region formed by folding the substrate 100 in one direction and an unfolding region positioned at both ends of the folding region may be formed on the substrate 100.

The folding region may be defined as a region in which the curvature R is formed, and the unfolded region may be defined as a region in which the curvature R is not formed or the curvature is close to zero.

4 and 5, the substrate 100 may be folded in one direction to be formed in an order of an unfolding area, a folding area, and an unfolding area.

A plurality of holes may be formed in at least one of the first region 1A and the second region 2A to distribute stress generated when the substrate 100 is folded.

Hereinafter, a pattern of holes and grooves formed in a display substrate according to an exemplary embodiment and a process of forming the pattern will be described with reference to FIGS. 6 to 12.

6 and 7 are views showing a top view of one side and the other side of a display substrate according to an embodiment, respectively. In detail, FIG. 6 is a view showing a top view of one surface (1S) of the substrate, which is the inner side of the folding when the substrate 100 is folded, and FIG. 7 is a view showing the outer surface of the folding when the substrate 100 is folded It is a diagram showing a top view of the other surface 2S of the phosphorus substrate.

6 and 7, a plurality of holes H passing through the display substrate 100 may be formed in the display substrate 100.

For example, a first hole H1 may be formed in the first region 1A of the display substrate 100, and a second hole H2 may be formed in the second region 2A. The second hole H2 formed in the second area 2A may be selectively formed, and the display substrate 100 is formed with only the first hole H1 of the first area 1A, or A first hole H1 may be formed in the first region 1A, and a second hole H2 may be formed in the second region 2A.

In detail, a plurality of first holes H1 penetrating the substrate 100 may be formed in the first region 1A of the substrate 100. That is, a plurality of first holes H1 penetrating the substrate 100 may be formed in the folding area of the substrate 100. The first holes H1 may be formed to be spaced apart from each other in the first region 1A.

Meanwhile, in FIGS. 6 and 7, only three first holes formed in the first region 1A in a row direction and five first holes in a column direction are shown, but this is for convenience of description, and the first region 1A ), more or less first holes may be formed in a row direction or a column direction, and this may be equally applied to the following cross-sectional views.

The plurality of first holes H1 formed in the first region 1A may serve to relieve stress applied to the display substrate by dispersing a stress generated when the first region is folded. In detail, deformation and damage according to the stress may occur in the first region 1A of the substrate due to compressive stress generated when the substrate 100 is folded.

Accordingly, by forming a plurality of first holes H1 in the first region 1A, it is possible to prevent stress from being concentrated in a specific region of the first region 1A. Accordingly, damage to the substrate may be prevented due to compressive stress generated when the substrate 100 is folded.

The first holes H1 may be formed in a regular pattern in the first region 1A, or the first holes H1 may be formed in an irregular pattern in the first region 1A. .

The first hole H1 may be formed while having a curved surface. In detail, the first hole H1 may be formed in a shape having a curved surface such as an oval shape, a hemispherical shape, or a circular shape.

However, the embodiment is not limited thereto, and of course, the first hole H1 may be formed in a polygonal shape such as a triangle or a square.

A second hole H2 may be formed in the second region 2A. In detail, a second hole H2 may be formed in the second region 2A defined as an unfolding region. That is, holes may be formed in the entire area of the display substrate 100.

A plurality of second holes H2 spaced apart from each other may be formed in the second region 2A. The second hole H2 may be formed through the display substrate 100. In detail, the second hole H2 may be formed through the one surface 1S and the other surface 2S of the substrate 100.

That is, the second hole H2 may be formed through the one surface 1S positioned inside the folding direction and the other surface 2S disposed outside the folding direction.

The second hole H2 may serve to reduce a difference in deformation due to heat with the first region 1A in which the first hole H1 is formed.

In detail, by forming holes in both the first region 1A and the second region 2A, the difference between the deformation caused by heat in the first region 1A and the deformation caused by heat in the second region 1A is reduced. It can be alleviated. Accordingly, it is possible to prevent the display substrate from being bent or warped.

That is, a difference in stress between the first region 1A and the second region 2A may be relaxed to prevent a warpage of the display substrate due to the difference in stress.

The second holes H2 may be formed in a regular pattern in the second region 2A, or the second holes H2 may be formed in an irregular pattern in the second region 2A. .

The second hole H2 may be formed while having a curved surface. In detail, the second hole H2 may be formed in a shape having a curved surface such as an oval shape, a hemispherical shape, or a circular shape.

However, the embodiment is not limited thereto, and of course, the second hole H2 may be formed in a polygonal shape such as a triangle or a square.

The first hole H1 and the second hole H2 may have the same shape and size. Alternatively, the first hole H1 and the second hole H2 may have different shapes or may have different sizes.

On the other hand, the first region 1A and the second region 2A may be classified by the presence or absence of a hinge portion. That is, the folding area and the unfolding area may be classified by the presence or absence of the hinge portion.

In detail, a plurality of hinge portions may be formed in the first region 1A, and hinge portions may not be formed in the second region 2A.

That is, the folding region may be defined as a region in which the hinge portion HN is formed.

The hinge portion HN may be defined as a point at which folding starts in the substrate 100. That is, the substrate may start folding from the hinge portions at both ends of the plurality of hinge portions.

The hinge portion HN may include a plurality of hinge portions according to the folding shape of the substrate 100. The hinge portions HN may be formed at both ends of the substrate 100 overlapping the column direction in which the holes H are formed based on a unidirectional length in the width direction of the substrate 100.

Accordingly, when the display substrate 100 is folded by the hinge portion HN. The folding area can be easily folded.

The hinge portion HN may be formed by penetrating one surface and the other surface of a unidirectional region among the end regions of the substrate 100. That is, the hinge portion HN may be defined as a hole formed by penetrating both end regions in the unidirectional direction among the end regions of the substrate 100.

The shape of the hinge portion HN may be the same as or different from the shape and size of the hole H. For example, the hinge portion HN may be formed while having a curved surface. In detail, the hinge portion HN may be formed in a shape having a curved surface such as an oval shape, a hemispherical shape, or a circular shape.

However, the embodiment is not limited thereto, and of course, the hinge portion may be formed in a polygonal shape such as a triangle or a square or an elliptical shape.

8 is a diagram illustrating a cross-sectional view taken along area A-A' of FIG. 6. Referring to FIG. 8, a plurality of holes formed through one surface 1S and the other surface 2S of the display substrate 100 may be formed in the display substrate 100.

The first hole H1 may have a different size according to each area. In detail, the first hole H1 may have different inner diameter sizes according to each area. That is, the etching degree of the first hole H1 may be different according to each region.

Referring to FIG. 9, the display substrate 100 may include a plurality of regions. In a posture, the display substrate 100 is defined as an outer area OA extending in the depth direction of the first hole H1 and an interior of the display substrate 100, and the outer area OA ) May include an inner area IA between them.

That is, the display substrate 100 is defined as an outer area OA extending in a depth direction from the surface of the display substrate 100 and an inside of the display substrate 100, and the outer area ( OA) may include an inner area (IA) between.

Accordingly, the first hole H1 includes an outer region extending in a depth direction from the one surface and the other surface; And an inner area between the outer areas.

The first hole H1 may have different sizes in the outer area OA and the inner area OA. That is, the first hole H1 may have different inner diameter sizes in the outer area OA and the inner area OA.

In detail, the size of the first inner diameter IR1 in the outer area OA of the first hole H1 may be larger than the size of the second inner diameter IR2 in the inner area OA.

In addition, the first hole H1 may have a size OR of an outer diameter in the outer region OA, and the size OR of the outer diameter may be the first inner diameter IR1 and the second inner diameter ( It may be larger than the size of IR2).

In the outer area OA, the size of the first hole H1 may be gradually changed and formed. In detail, in the outer area OA, a size of the first inner diameter IR1 of the first hole H1 may be formed to gradually decrease while extending in the direction of the inner area IA. That is, the size of the first inner diameter IR1 of the first hole H1 in the outer region OA may be formed to gradually decrease as the distance from the outer diameter OR increases.

That is, the first hole H1 is formed as a curved surface in which the inner surface has a constant curvature in the outer area OA, and the size of the first inner diameter IR1 in the outer area OA is the outer diameter OR ) May gradually decrease while extending in the direction of the inner region IA.

Accordingly, the first hole H1 may be formed while the outer area OA of the display substrate 100 is etched more than the inner area IA.

Meanwhile, in the previous description, the first hole H1 has been described, but the second hole H2 formed in the second region, which is an unfolding region, is also a second hole H2 like the first hole H1. The size of the inner diameter of the outer region and the inner region may be different, and a detailed description thereof will be omitted.

In the case of the display substrate 100, a residual stress on the surface of the display substrate 100 may be greater than the internal residual stress while passing through a process such as cold rolling before pattern formation such as holes.

Accordingly, in the display substrate 100 according to the embodiment, when forming the holes, an outer region having a high residual stress is formed larger than an inner region having a relatively low residual stress, that is, formed by etching more, In the substrate 100 for use, a difference in stress according to regions may be reduced.

Accordingly, the display substrate according to the exemplary embodiment minimizes warpage or bending of the display substrate due to a difference in stress between the surface layer and the inner layer, thereby improving flatness and reliability of the display substrate.

Meanwhile, the first hole H1 and the second hole H2 described above may be simultaneously formed by the same method. In detail, the first hole H1 and the second hole H2 may be simultaneously formed by using a laser.

10 to 12 are views for explaining a process of forming a first hole and a second hole in the display substrate 100 according to the embodiment. That is, FIGS. 10 to 12 are diagrams for explaining a method of forming a pattern of a display substrate according to an exemplary embodiment.

Referring to FIG. 10, first, a metal substrate 100 ′ is prepared.

The metal substrate 100 ′ may include SUS or the like. The surface of one surface and the other surface of the metal substrate 100 ′ may be subjected to a cold rolling process.

Referring to FIG. 11, a pattern may be formed on the metal substrate 100 ′.

In detail, a laser may be irradiated on one surface 1S and the other surface 2S of the metal substrate 100 ′. That is, the metal substrate 100 ′ may be partially etched by irradiating a laser to some of the areas of the one surface 1S and the other surface 2S of the metal substrate 100 ′.

Accordingly, the metal substrate 100 ′ is partially half-etched, and a plurality of grooves formed on one surface 1S and the other surface 2S of the metal substrate 100 ′ are formed in the metal substrate 100 ′. Can be.

A plurality of grooves formed on one surface 1S and the other surface 2S of the metal substrate 100 ′ may be formed to overlap each other.

Subsequently, referring to FIG. 12, a hole may be formed in the metal substrate 100 ′.

In detail, a laser may be irradiated on one surface 1S and the other surface 2S of the metal substrate 100 ′. That is, by irradiating a laser on all areas of one surface 1S and the other surface 2S of the metal substrate 100 ′, the metal substrate 100 ′ may be etched as a whole. Accordingly, the thickness of the metal substrate 100 ′ may be reduced from the first thickness T1 to the second thickness T2.

Accordingly, in the region of the metal substrate that has already been half-etched in the metal substrate 100 ′, grooves on one side and the other side may pass through to form a hole. In addition, the metal substrate 100 ′ may be etched and etched in a region not subjected to half-etching.

That is, in the metal substrate 100 ′, a slimming process for etching the surface layer of the metal substrate and an etching process for forming a hole in the metal substrate 100 ′ may be simultaneously performed. In detail, a slimming process of partially etching a surface layer of a metal substrate to reduce residual stress of a metal substrate by a single laser irradiation, and an etching process of a pattern hole for distributing stress due to folding may be simultaneously performed.

Accordingly, in the display substrate according to the embodiment, a plurality of processes may not be performed step by step, and exposure, development, and etching processes may be omitted using a photoresist, and thus process efficiency may be improved.

In addition, while performing a plurality of processes step by step, it is possible to prevent the occurrence of variations in the upper and lower portions of the substrate, thereby preventing the warpage of the substrate, thereby improving the reliability of the display substrate.

13 is a diagram for describing an example in which a display substrate according to embodiments is applied.

Referring to FIG. 13, the substrate for a display according to embodiments may be applied to a flexible display device that displays a display.

For example, the display substrate according to the embodiments may be applied to a flexible display device such as a mobile phone or a tablet.

Such a display substrate may be applied to a flexible display device such as a flexible, bent or folded mobile phone or tablet.

The display substrate is applied to a flexible display device such as a flexible, bent or folded mobile phone, tablet, etc., and the reliability of the flexible display device may be improved by improving the folding reliability in a display device that is repeatedly folded or restored.

Features, structures, effects, and the like described in the above-described embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in each embodiment may be combined or modified for other embodiments by a person having ordinary knowledge in the field to which the embodiments belong. Accordingly, contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the embodiments have been described above, these are only examples and do not limit the present invention, and those of ordinary skill in the field to which the present invention pertains are illustrated above within the scope not departing from the essential characteristics of the present embodiment. It will be seen that various modifications and applications that are not available are possible. For example, each component specifically shown in the embodiments can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims (10)

A display substrate including one surface and the other surface opposite to the one surface, and including a first region and a second region,
The display substrate is folded to face the one surface,
The first area is defined as a folding area, the second area is defined as an unfolding area,
A first hole penetrating the one surface and the other surface is formed in the first region,
The first hole may include an outer region extending in a depth direction from the one surface and the other surface; And an inner region between the outer regions,
The first hole is a display substrate in which a first inner diameter size in the outer area is larger than a second inner diameter size in the inner area. The method of claim 1,
A display substrate having an outer diameter size of the first hole larger than the first inner diameter size and the second inner diameter size. The method of claim 1,
A display substrate having a size of the first inner diameter extending from the one surface and the other surface toward the inner region and decreasing. The method of claim 1,
A display substrate formed with a curvature in an inner surface of the first hole corresponding to the outer region. The method of claim 1,
Further comprising a second hole formed in the second region,
The second hole is a display substrate in which a first inner diameter in the outer region is larger than a second inner diameter in the inner region. The method of claim 5,
The size of the outer diameter of the second hole is formed larger than the size of the first inner diameter and the size of the second inner diameter,
The size of the first inner diameter of the second hole extends from the one surface and the other surface toward the inner area and decreases. Preparing a metal substrate including one side and the other side;
Forming grooves on the one side and the other side by partially irradiating the laser to the metal substrate;
Including the step of irradiating a laser entirely on the metal substrate,
A method of forming a pattern for a display in which the groove formed on the one surface and the groove formed on the other surface overlap each other. The method of claim 7,
In the step of irradiating the entire laser to the metal substrate
In the region where the groove is formed, the groove formed on the one surface and the groove formed on the other surface are formed as holes penetrating the one surface and the other surface of the metal substrate,
In a region where the groove is not formed, the surface of the metal substrate is etched. A display substrate; And
Including at least one panel of a display panel and a touch panel disposed on the display substrate,
The display substrate includes one surface and the other surface opposite to the one surface,
The display substrate is folded to face the one surface,
The display substrate may include a first area defined as a folding area; And a second area defined as an unfolding area,
A first hole penetrating the one surface and the other surface is formed in the first region,
The first hole may include an outer region extending in a depth direction from the one surface and the other surface; And an inner region between the outer regions,
The first hole is a display device in which a first inner diameter size in the outer area is larger than a second inner diameter size in the inner area The method of claim 9,
The size of the outer diameter of the first hole is formed larger than the size of the first inner diameter and the size of the second inner diameter,
The size of the first inner diameter extends from the one surface and the other surface toward the inner area and decreases.

Images