KR20210028830A - Substrate for display and display application having the same - Google Patents

Abstract

According to an embodiment of the present invention, a display substrate includes: one surface and the other surface opposite to the one surface and a first region and a second region. 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 unfolding region, a hole penetrating the one surface and the other surface is formed in the first region, a first groove is formed in the one surfaces of the first region and the second region in a direction from the one surface to the other surface, a groove 2-1 is formed in the direction from the one surface to the other surface, in the second region, and a groove 2-2 is formed in the direction from the one surface to the other surface. The present invention may include a plurality of grooves formed in the folding region and the unfolding region.

Description

Display substrate and display device including the same {SUBSTRATE FOR DISPLAY AND DISPLAY APPLICATION HAVING THE SAME}

The embodiment relates to a display substrate and a display device including the same.

Recently, there is an increasing demand for a 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 display may be folded or partially bent when carrying or stored, and may be implemented in an unfolded state when displaying an image. Accordingly, it is possible to increase the image display area and facilitate the user's portability.

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

That is, since folding and unfolding operations are repeated in the foldable display device, the substrate of the 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 restoration.

Meanwhile, a display substrate constituting a foldable display device generally uses a metal substrate. In detail, the foldable display device may be formed by disposing a display panel, a touch panel, and a cover substrate on a flexible and foldable display substrate.

In this case, in order to dissipate heat generated from the display panel, the touch panel, or the like, a heat dissipation substrate may be additionally disposed between the display substrate and the panel.

However, the thickness and weight of the foldable display device are increased by the heat dissipation substrate, and the folding degree of the foldable display device is limited due to the increased thickness.

Accordingly, there is a need for a display substrate and a display device having a new structure capable of solving the above problems.

The embodiment provides a display substrate having folding characteristics and heat dissipation characteristics, and a display substrate 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 so that the one surface faces the A first area is defined as a folding area, the second area is defined as an unfolded area, and the first area includes a hole penetrating the one surface and the other surface; And a first groove formed in a direction of the other surface opposite from the one surface, and in the second region, a 2-1 groove formed from the one surface in a direction of the other surface; And a 2-2 groove formed in the direction of the one surface on the other surface.

The display substrate according to the embodiment may include a plurality of grooves formed in a folding area and an unfolding area.

These grooves may increase the surface roughness, that is, the roughness of the display substrate. That is, the surface area of the display substrate may be increased by the grooves formed by partially etching the display substrate.

Accordingly, heat dissipation characteristics of the display substrate may be improved by the grooves. That is, the heat dissipation area of the display substrate is increased by the grooves, and accordingly, the overall heat dissipation characteristic of the display substrate may be improved.

Accordingly, in the display device to which the display substrate is applied, a separate heat dissipation substrate for a heat dissipation function may be omitted. That is, since the foldable characteristics of the display substrate are improved by the holes and grooves formed in the display substrate, the heat dissipation area of the display substrate is increased to improve heat dissipation characteristics, so that a separate heat dissipation substrate can be omitted.

Accordingly, it is possible to reduce the thickness of the display device to which the display substrate according to the embodiment is applied. In addition, it is possible to prevent the folding property from being deteriorated by the heat dissipating substrate, and thus the folding property can be improved.

1 is a diagram illustrating a perspective view of a foldable display device according to an embodiment.
2 is a diagram illustrating a perspective view of a foldable display device according to another exemplary embodiment.
3 is a diagram illustrating a perspective view of a display substrate according to an embodiment.
4 is a view showing a side view of a display substrate according to an embodiment before folding.
5 is a diagram illustrating a side view of a display substrate according to an embodiment after folding.
6 is a diagram illustrating a top view of one surface of a substrate for a foldable display according to an exemplary embodiment.
7 is a diagram illustrating 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 a top view of one surface of a substrate for a foldable display according to another exemplary embodiment.
10 is a diagram illustrating a top view of the other surface of a display substrate according to another exemplary embodiment.
11 is a diagram illustrating a cross-sectional view taken along area BB′ of FIG. 9.
12 is a diagram illustrating a top view of one surface of a substrate for a foldable display according to another exemplary embodiment.
13 is a diagram illustrating a top view of the other surface of a display substrate according to another exemplary embodiment.
FIG. 14 is a diagram illustrating a cross-sectional view of a region CC′ of FIG. 12.
15 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 of the embodiments to be described, but may be implemented in a variety of 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 used by combining with

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 this 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 constituent element from other constituent elements, and are not limited to the nature, order, or order of the constituent element 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 component between the other components 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 It also includes the case where the above other component is formed or disposed between the two components.

In addition, when expressed as “up (up) or down (down)”, it may include not only an upward direction but also a downward direction based on one component.

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 apparatus 1000 according to an exemplary embodiment may include a display substrate 100 and a display panel 200 disposed above the display substrate 100.

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

The display substrate 100 may include a material such as metal. For example, the display 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. I can.

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

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

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

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

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

The display substrate 100 may include an effective area AA and a non-effective area UA. The effective area AA may be defined as an area in which the display panel 200 or the like is disposed. That is, the effective area AA may be a display panel mounting area. In addition, the ineffective area UA is an area in which the display panel 200 or the like is not disposed, and may be defined as an area surrounding the effective area AA. That is, the ineffective area UA may be a bezel area.

The display substrate 100 may have a certain thickness. In detail, the substrate 100 may have a thickness of about 1000 μm or less. In more detail, the substrate 100 may have a thickness of about 30 μm to 1000 μm.

When the thickness of the display substrate 100 exceeds about 1000 μm, when the display device is folded, cracks may occur due to the thickness of the substrate 100, and the thickness of the display substrate 100 is When the thickness is less than about 30 μm, the strength of the display substrate 100 is lowered, and thus the role of the support substrate may be difficult.

The display panel 200 may be disposed on the display substrate 100. In detail, the display panel 200 may be disposed on the effective area AA of the display 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 is possible at a relatively low temperature, and can 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 characteristics 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 the 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 display 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 by using a capacitive method or a resistive film method.

The substrate of the touch panel 300 may include a material having flexible characteristics 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 substrate 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 display substrate 100, the display panel 200, and the touch panel 300 may be adhered to each other through an adhesive layer or the like. At this time, when the display substrate 100 and the display panel 200 are bonded, the adhesive layer is not disposed in the first area, that is, the folding area, of the substrate 100, and the second area, that is, the unfolding area. Only the adhesive layer may be disposed and adhered to each other, or may be adhered by disposing the adhesive layer on the entire surface of the area 1 or 2.

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

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

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

The display 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 display substrate 100 will be mainly bent in a direction facing each other.

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

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

4 and 5, the display substrate 100 may include a first area 1A, which is an area where the display substrate 100 is bent. In addition, the display 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 a direction in which the display 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 area 1A and the second area 2A may be formed on the same display 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 display substrate 100.

The first area 1A and the second area 2A may have different sizes. 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 at the center of the substrate 100, but the embodiment is not limited thereto. That is, the first region 1A is It can be located in the end and end regions. That is, the first region 1A may be located at one end and an end region of the display substrate 100 so that the size of the second region 2A is asymmetric.

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

Referring to FIG. 5, the display 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 display substrate 100 is folded in one direction, a first region 1A and a second region 2A may be formed on the display substrate 100. That is, the display substrate 100 may have a folding area formed as the substrate 100 is folded in one direction and an unfolding area positioned at both ends of the folding area.

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

Meanwhile, the display panel and/or the touch panel disposed on the display substrate 100 may generate heat during driving, and accordingly, the foldable display device may generate heat at a certain temperature or higher during driving.

Accordingly, there is a need for a structure capable of dissipating heat in a foldable display device. In this case, when an additional heat dissipation substrate for dissipating heat is disposed, the overall thickness is increased by the heat dissipation substrate, and such an increase in thickness may reduce folding of the display device.

Accordingly, an embodiment is intended to provide a display substrate having heat dissipation characteristics as well as a supporting role by modifying the display substrate 100.

Hereinafter, a display substrate having a folding characteristic and heat dissipation characteristic will be described with reference to FIGS. 6 to 14.

First, a substrate for a display according to an exemplary embodiment will be described with reference to FIGS. 6 to 8.

6 and 7 are views showing a top view of one side and the other side of a display substrate according to an exemplary 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 fold 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 figure which shows the top view of the other surface 2S of a phosphorus board|substrate.

In addition, FIG. 8 is a diagram illustrating a cross-sectional view taken along area A-A' of FIG. 6.

6 and 7, a plurality of holes and a plurality of grooves penetrating the display substrate 100 may be formed in the display substrate 100.

In detail, a hole H and a first groove G1 may be formed in the first region 1A of the display substrate 100. That is, a plurality of holes H and first grooves G1 may be formed in the folding area of the display substrate.

In detail, in the first region 1A of the display substrate 100, a plurality of holes H penetrating through one surface 1S and the other surface 2S of the display substrate 100 and the display substrate ( A first groove G1 formed from one surface of 100) to the other surface may be formed.

The holes H may be disposed to be spaced apart from each other in the first region 1A. The plurality of holes H may be formed in the same or different sizes. In addition, the plurality of holes H may be formed in the same or different shapes. In addition, the plurality of holes H may be disposed to be spaced apart from each other at the same or different intervals.

The plurality of holes H formed in the first region 1A may serve to relieve stress applied to the display substrate by distributing stress generated when the first region is folded. That is, the hole H may be defined as a stress relief pattern.

In detail, deformation and damage due to stress may occur in the first region 1A of the substrate due to compressive stress generated when the display substrate 100 is folded.

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

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

The hole H may be formed while having a curved surface. In detail, the hole H 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 it goes without saying that the hole H may be formed in a polygonal shape such as a triangle or a square.

In addition, a plurality of grooves may be formed in the first region 1A of the display substrate 100.

In detail, a first groove G1 formed on any one surface of the display substrate 100 may be formed in the first region 1A.

The first groove G1 may be formed on any one surface of the display substrate 100. 6 to 8, the display substrate 100 according to an exemplary embodiment includes a first groove formed in a direction from one surface 1S of the first area 1A of the display substrate 100 to the other surface. G1) may be included. That is, the first groove G1 may be formed in the folding inner surface of the display substrate. That is, the first groove G1 may be formed in a direction from one surface of the display substrate 100 to the other surface, and one surface of the display substrate 100 may be opened and the other surface may be formed in a closed groove shape. .

A plurality of first grooves G1 may be formed in the first region 1A. In detail, the first grooves G1 may include a plurality of first grooves G1 disposed to be spaced apart from each other in the first region 1A.

The first groove G1 may be formed between the holes H formed in the first region 1A, that is, at least one first groove G1 is formed between the holes H1. Can be. In addition, the size of the first groove G1 and the size of the hole H may be the same or different from each other. For example, the size of the opening area of the first groove G1 is the hole H ) May be the same as or different from each other.

In addition, the first groove G1 may be formed to a depth of less than 1/2 of the thickness of the display substrate 100. When the depth of the first groove G1 is formed to a depth of 1/2 or more of the thickness of the display substrate 100, the difference in stress on one surface and the other surface of the display substrate is rapidly increased, The shape deformation of the substrate 100 is intensified, so that the flatness of the display substrate 100 may be deteriorated.

Further, the display substrate 100 may have grooves formed in the second region 2A. The second groove may be formed on both surfaces of the display substrate 100.

6 to 8, a display substrate 100 according to an exemplary embodiment is formed in a direction from one surface 1S of the second area 2A of the display substrate 100 to the other surface. It may include a groove G2-1 and a 2-2 groove G2-2 formed in a direction from the other surface 2S of the second area 2A of the display substrate 100 in the direction of one surface 1S. . That is, the second region 2A may be formed on both the inner and outer folded surfaces of the display substrate.

Referring to FIG. 8, the 2-1 groove G2-1 and the 2-2 groove G2-2 may be disposed to overlap each other in a direction corresponding to a thickness for the display. That is, the 2-1 groove G2-1 and the 2-2 groove G2-2 may be disposed at positions corresponding to each other in a direction corresponding to the thickness of the display.

In addition, the sizes of the 2-1 groove G2-1 and the 2-2 groove G2-2 may be the same or different. In detail, the opening diameters and opening depths of the 2-1 groove G2-1 and the 2-2 groove G2-2 may have the same size or different sizes.

In addition, the depths of the 2-1 groove G2-1 and the 2-2 groove G2-2 may be formed to have a size less than 1/2 of the thickness of the display substrate 100, respectively. . When the depths of the 2-1 groove G2-1 and the 2-2 groove G2-2 are formed to a depth equal to or greater than 1/2 of the thickness of the display substrate 100, a groove forming process Among them, the 2-1 groove G2-1 and the 2-2 groove G2-2 may overlap each other to form a groove penetrating the display substrate, so that heat dissipation characteristics may be deteriorated.

In addition, when the depths of the 2-1 groove G2-1 and the 2-2 groove G2-2 are formed to a depth equal to or greater than 1/2 of the thickness of the display substrate 100, the The difference in stress on one surface and the other surface of the display substrate is rapidly increased, so that the shape deformation of the display substrate 100 is deepened, so that the flatness of the display substrate 100 may be deteriorated.

The first groove G1, the 2-1 groove G2-1, and the 2-2 groove G2-2 may increase the surface roughness, that is, the roughness of the display substrate 100. . That is, the first groove G1, the 2-1 groove G2-1, and the 2-2 groove G2-2 formed by partially etching the display substrate 100 The surface area of the display substrate 100 may increase.

Accordingly, heat dissipation characteristics of the display substrate 100 may be improved by the first groove G1, the 2-1 groove G2-1, and the 2-2 groove G2-2. have. That is, the heat dissipation area of the display substrate 100 is increased by the first groove G1, the 2-1 groove G2-1, and the 2-2 groove G2-2, Accordingly, the overall heat dissipation characteristics of the display substrate 100 may be improved.

Accordingly, in the display device to which the display substrate is applied, a separate heat dissipation substrate for a heat dissipation function may be omitted. That is, since the foldable characteristics of the display substrate are improved by the holes and grooves formed in the display substrate, the heat dissipation area of the display substrate is increased to improve heat dissipation characteristics, so that a separate heat dissipation substrate can be omitted.

In addition, when a separate heat dissipation substrate is omitted, and when a display substrate and a panel such as a display panel are in direct contact, the contact area of the display substrate is increased, thereby improving the adhesion between the display substrate and the display panel. Reliability can be improved.

Accordingly, it is possible to reduce the thickness of the display device to which the display substrate according to the embodiment is applied. In addition, it is possible to prevent the folding property from being deteriorated by the heat dissipating substrate, and thus the folding property can be improved.

Meanwhile, referring to FIG. 8, the grooves may be formed while having a predetermined interval, width, and depth. That is, the grooves may be formed while having a predetermined spacing, width, and depth in order to optimize the folding characteristics and heat dissipation characteristics of the display substrate.

In detail, the sizes of the width/depth w/D of the 2-1 groove G2-1 and the 2-2 groove G2-2 may range from 0.5 to 3. Here, the widths of the 2-1 groove G2-1 and the 2-2 groove G2-2 are the 2-1 groove G2-1 and the 2-2 groove G2. It can be defined as the size of the surface hole formed by -2). That is, the widths of the 2-1 groove G2-1 and the 2-2 groove G2-2 are the 2-1 groove G2-1 and the 2-2 groove G2. It can be defined as the size of the surface hole of -2).

In addition, the pitch P of the 2-1 groove G2-1 and the 2-2 groove G2-2 is the 2-1 groove G2-1 and the 2-2 groove ( G2-2) May be larger than the width of the.

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 where folding starts in the display 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 display 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 end regions of the display 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 quadrangle or an elliptical shape.

Hereinafter, a substrate for a display according to another exemplary embodiment will be described with reference to FIGS. 9 to 11. In the description of the display substrate according to another embodiment, the description of the same and similar description as the description of the display substrate according to the above-described embodiment will be omitted. In addition, the same reference numerals are assigned to the same configuration.

The display substrate according to another exemplary embodiment may have different positions of the grooves formed in the first region 1A from the display substrate according to the above-described exemplary embodiment.

In detail, in the display substrate according to another embodiment, a first groove G1 formed in a direction from the other surface 2S to the one surface 1S in the first region 1A of the display substrate 100 is formed. I can. That is, in the display substrate according to another exemplary embodiment, the first groove G1 may be formed in the folding outer surface of the display substrate in the first area 1A of the display substrate 100.

Hereinafter, a substrate for a display according to another exemplary embodiment will be described with reference to FIGS. 12 to 14. In the description of the display substrate according to another embodiment, descriptions that are the same as those of the display substrate according to the above-described embodiment will be omitted. In addition, the same reference numerals are assigned to the same configuration.

A display substrate according to another exemplary embodiment may have different positions of a groove formed in the first region 1A from the display substrate according to the above-described exemplary embodiments.

In detail, in the display substrate according to another exemplary embodiment, in the first region 1A of the display substrate 100, the first 1-1 groove G1-1 is formed in the direction from the one surface 1S to the other surface 2S. ) And a first 1-2 groove G1-2 formed in the direction of the one surface 1S from the other surface 2S. That is, in the display substrate according to another exemplary embodiment, grooves may be formed on both inner and outer surfaces of the display substrate in the first area 1A of the display substrate 100.

Referring to FIG. 14, the first-1 groove G1-1 and the 1-2 groove G1-2 may be disposed to overlap each other in a direction corresponding to the thickness of the display. That is, the first-1 groove G1-1 and the 1-2 groove G1-2 may be disposed at positions corresponding to each other in a direction corresponding to the thickness of the display.

In addition, the sizes of the 1-1 groove G1-1 and the 1-2 groove G1-2 may be the same or different from each other. In detail, the opening diameters and opening depths of the 1-1 groove G1-1 and the 1-2 groove G1-2 may be formed to have the same size or different sizes.

In addition, the depths of the first-1 grooves G1-1 and the 1-2 grooves G1-2 may be formed to be less than 1/2 of the thickness of the display substrate 100, respectively. . When the depth of the 1-1 groove (G1-1) and the 1-2 groove (G1-2) is formed to a depth of 1/2 or more of the thickness of the display substrate 100, during the groove forming process Since the 1-1 groove G1-1 and the 1-2 groove G1-2 overlap each other to form a groove penetrating the display substrate, heat dissipation characteristics may be deteriorated.

In addition, when the depth of the 1-1 groove (G1-1) and the 1-2 groove (G1-2) is formed to a depth equal to or greater than 1/2 of the thickness of the display substrate 100, the display The difference in stress on one surface and the other surface of the display substrate is rapidly increased, so that the shape deformation of the display substrate 100 is deepened, and the flatness of the display substrate 100 may be reduced.

Meanwhile, referring to FIG. 15, the 2-1 groove G2-1 and the 2-2 groove G2-2 formed in the second region 2A may be arranged in a zigzag pattern with each other. . In detail, the 2-1 groove G2-1 and the 2-2 groove G2-2 formed in the second region 2A do not overlap with each other in the thickness direction of the display substrate. Can be placed on

In addition, although not shown in the drawing, the 1-1 groove G1-1 and the 1-2 groove G1-2 formed in the first region 1A may also be arranged in a zigzag pattern with each other. . That is, the 1-1 grooves G1-1 and the 1-2 grooves G1-2 formed in the first region 1A do not overlap with each other in the thickness direction of the display substrate. Can be placed on

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

Referring to FIG. 16, a display substrate 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 retracted.

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. Therefore, contents related to such combinations and modifications should be construed 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,
In the first region, a hole penetrating through the one surface and the other surface; And a first groove formed in the direction of the other surface opposite from one surface of the display substrate,
In the second region, a 2-1 groove formed from the one surface to the other surface; And a second-2 groove formed on the other surface in the direction of the one surface. The method of claim 1,
A plurality of holes spaced apart from each other are formed in the first region,
At least one first groove is formed between the holes. The method of claim 1,
A display substrate having a depth of at least one of the first groove, the 2-1 groove, and the 2-2 groove is less than 1/2 of the thickness of the display substrate. The method of claim 1,
The 2-1 groove and the 2-2 groove are disposed to overlap each other in a thickness direction of the display substrate. The method of claim 1,
The 2-1 groove and the 2-2 groove do not overlap with each other in a thickness direction of the display substrate. The method of claim 1,
A display substrate having a surface hole size (surface hole/depth) of 0.5 to 3.0 with respect to the depth of at least one of the first groove, the 2-1 groove, and the 2-2 groove. The method of claim 1,
A display substrate having a pitch of at least one of the first groove, the 2-1 groove, and the 2-2 groove is larger than the size of the surface hole. The method of claim 1,
A first-1 groove formed from the one surface to the other surface in the first region; And at least one of the 1-2 grooves formed in the direction of the one surface on the other surface. A display substrate; And
Including at least one 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, and includes 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,
In the first region, a hole penetrating through the one surface and the other surface; And a first groove formed in the direction of the other surface opposite from one surface of the display substrate,
In the second region, a 2-1 groove formed from the one surface to the other surface; And a second-2 groove formed from the other surface in the direction of the one surface. The method of claim 9,
A display device in which the display substrate and the panel are in direct contact.

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