KR102825873B1 - Substrate for display and display application having the same - Google Patents

Abstract

A display substrate according to an embodiment comprises a display substrate including one side and an opposite side to the one side, and including a first region and a second region, wherein the display substrate is folded such that the one side faces each other, the first region is defined as a folding region, and the second region is defined as an unfolding region, and in the first region, a hole penetrating the one side and the other side; and a first groove formed on the one side in the direction of the other side are formed, and in the second region, a 2-1 groove formed on the one side in the direction of the other side; and a 2-2 groove formed on the other side in the direction of the one side are formed.

Description

{SUBSTRATE FOR DISPLAY AND DISPLAY APPLICATION HAVING THE SAME}

The present invention relates to a substrate for a display and a display device including the same.

Recently, there has been an increasing demand for foldable display devices that are easy to carry for various applications and can display images on a larger screen when carried.

These flexible displays can be folded or partially bent when carried or stored, and can be implemented in an unfolded state when displaying images. This increases the image display area while making it easier for users to carry around.

These foldable display devices can be folded or bent, and then unfolded and restored, etc., through repeated processes.

That is, since the foldable display device repeats folding and unfolding movements, 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 folding and restoring.

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

At this time, a heat dissipation substrate may be additionally placed between the display substrate and the panel to dissipate heat generated from the display panel, touch panel, etc.

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

Therefore, a new display substrate and display device having a new structure that can solve the above problems are required.

The present invention 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 comprises one side and an opposite side to the one side, and is foldable with respect to a folding axis, wherein the display substrate comprises a first region including the folding axis and adjacent to the folding axis, and a second region provided on both sides of the first region and positioned farther from the folding axis than the first region, wherein a first direction in which the folding axis extends and a second direction perpendicular to the first direction are defined, and a plurality of hinge parts connected to both ends of the display substrate facing in the first direction are provided in the first region, and a hole including a plurality of hole patterns provided penetrating the one side and the other side and spaced apart from each other in the first direction between the plurality of hinge parts is provided, and a groove provided in the one side or the other side is provided in the second region, and a width of the hole pattern in the one side or the other side in the second direction is different from a width of the groove in the one side or the other side in the second direction.

A display substrate according to an embodiment may include a plurality of grooves formed in a folding region and an unfolding region.

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

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

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

Therefore, the thickness of a display device to which the display substrate according to the embodiment is applied can be reduced. In addition, the folding characteristics can be prevented from being deteriorated by the heat dissipation substrate, thereby improving the folding characteristics.

FIG. 1 is a perspective view illustrating a foldable display device according to an embodiment.
FIG. 2 is a perspective view illustrating a foldable display device according to another embodiment.
FIG. 3 is a perspective view of a display substrate according to an embodiment.
FIG. 4 is a drawing showing a side view of a display substrate before folding according to an embodiment.
FIG. 5 is a drawing showing a side view of a display substrate according to an embodiment after folding.
FIG. 6 is a top view of one side of a substrate for a foldable display according to an embodiment.
FIG. 7 is a drawing showing a top view of the other side of a display substrate according to an embodiment.
Figure 8 is a drawing showing a cross-sectional view taken along area AA' of Figure 6.
FIG. 9 is a top view of one side of a substrate for a foldable display according to another embodiment.
FIG. 10 is a top view of the other side of a display substrate according to another embodiment.
Figure 11 is a drawing showing a cross-sectional view taken along the BB' area of Figure 9.
FIG. 12 is a top view of one side of a substrate for a foldable display according to another embodiment.
FIG. 13 is a top view of the other side of a display substrate according to another embodiment.
Figure 14 is a drawing showing a cross-sectional view taken along the CC' region of Figure 12.
Fig. 15 is a drawing for explaining an application example of a substrate for a foldable display according to an embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the technical idea of the present invention is not limited to some of the embodiments 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 components among the embodiments may be selectively combined or substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention can be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, can be interpreted in consideration of the contextual meaning of the relevant technology.

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

In addition, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and are not intended to limit the nature, order, or sequence of the components.

In addition, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

Additionally, when it is described as being formed or arranged "above or below" each component, above or below includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components.

Also, when expressed as “upper or lower,” it can include the meaning of not only the upward direction but also the downward direction based on one component.

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

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

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

The above display substrate (100) can support the display panel (200). That is, the display substrate (100) can be a support substrate that supports the display panel (200).

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

The display substrate (100) may be flexible or foldable. That is, the display substrate (100) may be bent or curved 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 region (1A) and a second region (2A).

The above first region (1A) may be defined as a region where the display substrate (100) is folded. That is, the first region (1A) may be a folding region.

Additionally, the second region (2A) may be defined as a region in which the display substrate (100) is not folded. That is, the second region (2A) may be an unfolding region.

The first area (1A) and the second area (2A) are described in detail below.

The display substrate (100) may include an effective area (AA) and an ineffective area (UA). The effective area (AA) may be defined as an area where the display panel (200), etc., is placed. That is, the effective area (AA) may be a display panel mounting area. In addition, the ineffective area (UA) may be an area where the display panel (200), etc., is not placed, and may be defined as an area surrounding the effective area (AA). That is, the ineffective area (UA) may be a bezel area.

The above display substrate (100) may have a certain thickness. In detail, the substrate (100) may have a thickness of about 1000 ㎛ or less. More specifically, the substrate (100) may have a thickness of about 30 ㎛ to 1000 ㎛.

If the thickness of the display substrate (100) exceeds about 1000 ㎛, cracks may occur due to the thickness of the substrate (100) when the display device is folded, and if the thickness of the display substrate (100) is less than about 30 ㎛, the strength of the display substrate (100) may be reduced, making it difficult to function as a support substrate.

The display panel (200) may be placed on the upper portion of the display substrate (100). In detail, the display panel (200) may be placed on the effective area (AA) of the display substrate (100).

The above display panel (200) may include a plurality of pixels including a switching thin film transistor, a driving thin film transistor, a capacitor, 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 due to reasons such as low power and high brightness, it can be mainly applied to a flexible or foldable display device. Here, a pixel refers to the 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, gate lines arranged on the substrate, data lines and a common power line insulated from and intersecting the gate lines. Typically, one pixel may be defined by the gate line, the data line and the common power line as boundaries.

The above-described substrate may include a material having flexible properties such as a plastic film, and the display panel (200) may be implemented by arranging 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 above touch panel (300) may be placed on the upper part of the display panel (200). In detail, the touch panel (300) may be placed on the upper part of the display panel (200) on an area corresponding to the effective area (AA) of the display substrate (100).

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

The above touch panel (300) may include a substrate, and a touch electrode arranged on the substrate. The touch electrode may detect the position of an input device touching the flexible or foldable display device by a capacitive method or a resistive film method.

The substrate of the above touch panel (300) may include a material having flexible properties, such as a plastic film, and the touch panel (300) may be implemented by arranging touch electrodes on the flexible film.

Meanwhile, although not shown in the drawing, a cover substrate for protecting the foldable display device may be additionally placed on the upper portion of the touch panel (300) or the upper portion of the display panel (200) (if 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, etc. In this case, when the display substrate (100) and the display panel (200) are adhered, an adhesive layer may not be disposed in the first region of the substrate (100), i.e., the folding region, and may be disposed only in the second region, i.e., the unfolding region, to adhere to each other, or an adhesive layer may be disposed on the entire surface of regions 1 and 2 to adhere to each other.

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

Referring to FIG. 3, the display substrate (100) can be bent in one direction.

In detail, the display substrate (100) may include one side (1S) and another side (2S) opposite to the one side (1S). The one side (1S) of the display substrate (100) may be defined as a side facing the display panel (200), and the other side (2S) of the display substrate (100) may be defined as a side opposite to the one side (1S). That is, the display panel (200) may be placed on the one side (1S) of the display substrate (100).

The above display substrate (100) can be bent so that one side (1S) or the other side (2S) faces each other.

In the following description, the explanation will be centered on the fact that the one side (1S) of the display substrate (100) is bent in a direction facing each other, as shown in FIG. 3.

As previously explained, the display substrate (100) may have a first region (1A) and a second region (2A) defined. 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 side (1S) faces each other.

In detail, the display substrate (100) is bent in one direction, and the display substrate (100) can be divided into a first region (1A) which is a region that is folded (folding region) and a second region (2A) which is a region that is not folded (unfolding region).

Referring to FIGS. 4 and 5, the display substrate (100) may include a first region (1A) in which the display substrate (100) is bent. In addition, the display substrate (100) may include a second region (2A) that is not bent and is positioned adjacent to the first region (1A).

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

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

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

In the drawing, the first region (1A) is shown as being located in the central portion of the substrate (100), but the embodiment is not limited thereto. That is, the first region (1A) may be located at one end and an end region of the display substrate (100). 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 asymmetrical.

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

Referring to Fig. 5, the display substrate (100) can be folded in one direction around the folding axis. In detail, the one side (1S) can be folded in a direction facing each other along the folding axis.

As the display substrate (100) is folded in one direction, a first region (1A) and a second region (2A) can be formed on the display substrate (100). That is, as the display substrate (100) is folded in one direction, a folding region formed and an unfolding region located at both ends of the folding region can be formed on the display substrate (100).

The above folding region can be defined as a region where curvature (R) is formed, and the above unfolding region can be defined as a region where curvature (R) is not formed or where the curvature is close to 0.

Referring to FIGS. 4 and 5, the display substrate (100) can be folded in one direction to form an unfolding region, a folding region, and an unfolding region in that order.

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 folding the substrate (100).

Meanwhile, the display panel and/or touch panel placed on the display substrate (100) may generate heat during operation, and accordingly, the foldable display device may generate heat above a certain temperature during operation.

Accordingly, a configuration capable of dissipating heat is required in a device for a foldable display. In this case, if an additional heat-dissipating substrate is placed to dissipate heat, the overall thickness increases due to the heat-dissipating substrate, and this increase in thickness may deteriorate the folding of the display device.

Accordingly, the embodiment aims to provide a display substrate having heat dissipation properties along with a supporting role by modifying a display substrate (100).

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

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

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

In addition, Fig. 8 is a drawing showing a cross-sectional view taken along the A-A' region of Fig. 6.

Referring to FIGS. 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 region of the display substrate.

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

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

A plurality of holes (H) formed in the first region (1A) can serve to disperse stress generated when the first region is folded, thereby relieving stress applied to the display substrate. That is, the holes (H) can be defined as a stress relieving pattern.

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

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 the substrate (100) from being damaged by compressive stress that occurs when the substrate is folded.

The above 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 above hole (H) can be formed with a curved surface. In detail, the hole (H) can be formed with a shape having a curved surface such as an elliptical shape, a hemispherical shape, or a circular shape.

However, the embodiment is not limited thereto, and the hole (H) can of course be formed in a polygonal shape such as a triangle or a square.

Additionally, a plurality of grooves may be formed in the first region (1A) of the display substrate (100).

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

The first groove (G1) may be formed on either side of the display substrate (100). Referring to FIGS. 6 to 8, the display substrate (100) according to one embodiment may include a first groove (G1) formed in the opposite direction from one side (1S) of the first region (1A) of the display substrate (100). That is, the first groove (G1) may be formed on the inner folding surface of the display substrate. That is, the first groove (G1) may be formed in the opposite direction from one side of the display substrate (100), and may be formed in a groove shape in which one side of the display substrate (100) is open and the other side is closed.

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

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

In addition, the first groove (G1) may be formed to a depth less than 1/2 of the thickness of the display substrate (100). If the depth of the first groove (G1) is formed to a depth greater than 1/2 of the thickness of the display substrate (100), the stress difference between one side and the other side of the display substrate may rapidly increase, thereby aggravating the shape deformation of the display substrate (100) and deteriorating the flatness of the display substrate (100).

In addition, the display substrate (100) may have grooves formed in the second region (2A). The second grooves may be formed on both sides of the display substrate (100).

Referring to FIGS. 6 to 8, a display substrate (100) according to one embodiment may include a 2-1 groove (G2-1) formed in the direction of the other side (1S) of a second region (2A) of the display substrate (100) and a 2-2 groove (G2-2) formed in the direction of the one side (1S) of the other side (2S) of the second region (2A) of the display substrate (100). That is, the second region (2A) may be formed on both the folding inner side and the folding outer side of the display substrate.

Referring to FIG. 8, the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) can be arranged to overlap each other in a direction corresponding to the thickness of the display. That is, the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) can be arranged at positions corresponding to each other in a direction corresponding to the thickness of the display.

In addition, the sizes of the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) may be the same as or different from each other. In detail, the opening diameter and the opening depth of the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) may be formed to have the same size or different sizes.

In addition, the depth of the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) may be formed to a size less than 1/2 of the thickness of the display substrate (100), respectively. When the depth of the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) is formed to a depth greater than 1/2 of the thickness of the display substrate (100), the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) may overlap each other during the groove forming process to form a groove penetrating the display substrate, which may deteriorate the heat dissipation characteristics.

In addition, when the depth of the 2-1 groove (G2-1) and the 2-2 groove (G2-2) is formed to a depth of more than half the thickness of the display substrate (100), the stress difference between one side and the other side of the display substrate rapidly increases, so that the shape deformation of the display substrate (100) becomes severe and the flatness of the display substrate (100) may deteriorate.

The first groove (G1), the second-first groove (G2-1), and the second-second groove (G2-2) can increase the surface roughness, i.e., the roughness, of the display substrate (100). That is, the surface area of the display substrate (100) can increase by the first groove (G1), the second-first groove (G2-1), and the second-second groove (G2-2) that are formed by partially etching the display substrate (100).

Accordingly, the heat dissipation characteristics of the display substrate (100) can be improved by the first groove (G1), the second-first groove (G2-1), and the second-second groove (G2-2). That is, the heat dissipation area of the display substrate (100) increases by the first groove (G1), the second-first groove (G2-1), and the second-second groove (G2-2), and thus, the overall heat dissipation characteristics of the display substrate (100) can be improved.

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

In addition, when a separate heat dissipation substrate is omitted and the display substrate and the display panel, etc. are in direct contact with each other, the contact area of the display substrate increases, thereby improving the adhesive strength between the display substrate and the display panel, thereby improving the reliability of the display device.

Therefore, the thickness of a display device to which the display substrate according to the embodiment is applied can be reduced. In addition, the folding characteristics can be prevented from being deteriorated by the heat dissipation substrate, thereby improving the folding characteristics.

Meanwhile, referring to FIG. 8, the grooves can be formed with a constant interval, width, and depth. That is, the grooves can be formed with a constant interval, width, and depth in order to optimize the folding characteristics and heat dissipation characteristics of the display substrate.

In detail, the size of the width/depth (w/D) of the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) can be 0.5 to 3. Here, the size of the width of the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) can be defined as the size of the surface hole formed by the 2-1st groove (G2-1) and the 2-2nd groove (G2-2). That is, the size of the width of the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) can be defined as the size of the surface hole of the 2-1st groove (G2-1) and the 2-2nd groove (G2-2).

Additionally, the pitch (P) of the 2-1st groove (G2-1) and the 2-2nd groove (G2-2) may be larger than the width of the 2-1st groove (G2-1) and the 2-2nd groove (G2-2).

Meanwhile, the first region (1A) and the second region (2A) can be distinguished by the presence or absence of a hinge portion. That is, the folding region and the unfolding region can be distinguished by the presence or absence of the hinge portion.

In detail, a plurality of hinge parts may be formed in the first region (1A), and no hinge parts may be formed in the second region (2A).

That is, the above folding region can be defined as a region where the hinge portion (HN) is formed.

The above hinge part (HN) can be defined as a point where folding starts in the display substrate (100). That is, the substrate can start folding from the hinge parts at both ends among the plurality of hinge parts.

The above hinge portion (HN) may include a plurality of hinge portions depending on the folding shape of the substrate (100). The hinge portion (HN) may be formed at both ends of the display substrate (100) overlapping the thermal direction in which the hole (H) is formed based on the 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 above hinge portion (HN) may be formed by penetrating one side and the other side of a unidirectional region among the 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 of the unidirectional region 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 to have a curved surface. In detail, the hinge portion (HN) may be formed to have a curved shape 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 hinge portion may be formed in a polygonal shape such as a triangle or a square, or an oval shape.

Hereinafter, a display substrate according to another embodiment will be described with reference to FIGS. 9 to 11. In the description of the display substrate according to another embodiment, descriptions that are identical or similar to those of the display substrate according to the previously described embodiment will be omitted. In addition, the same drawing reference numerals are given to the same configurations.

A display substrate according to another embodiment may have a different position of the groove formed in the first region (1A) than the display substrate according to the previously described embodiment.

In detail, a display substrate according to another embodiment may have a first groove (G1) formed in a direction from the other surface (2S) to the one surface (1S) in a first area (1A) of the display substrate (100). That is, a display substrate according to another embodiment may have a first groove (G1) formed on a folding outer surface of the display substrate in the first area (1A) of the display substrate (100).

Hereinafter, a display substrate according to another 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 identical or similar to those of the display substrate according to the previously described embodiment will be omitted. In addition, the same drawing reference numerals are given to the same configurations.

According to another embodiment, the display substrate may have a different position of the groove formed in the first region (1A) than the display substrate according to the embodiments described above.

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

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

In addition, the sizes of the first-first groove (G1-1) and the first-second groove (G1-2) may be the same as or different from each other. In detail, the opening diameter and the opening depth of the first-first groove (G1-1) and the first-second groove (G1-2) may be formed to have the same size or different sizes.

In addition, the depth of the first-first groove (G1-1) and the first-second groove (G1-2) may be formed to a size less than half the thickness of the display substrate (100), respectively. When the depth of the first-first groove (G1-1) and the first-second groove (G1-2) is formed to a depth greater than half the thickness of the display substrate (100), the first-first groove (G1-1) and the first-second groove (G1-2) may overlap each other during the groove forming process to form a groove penetrating the display substrate, which may deteriorate the heat dissipation characteristics.

In addition, when the depth of the first-first groove (G1-1) and the first-second groove (G1-2) is formed to a depth of more than half the thickness of the display substrate (100), the stress difference between one side and the other side of the display substrate rapidly increases, so that the shape deformation of the display substrate (100) becomes severe and the flatness of the display substrate (100) may deteriorate.

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 respect to each other. In detail, the 2-1 groove (G2-1) and the 2-2 groove (G2-2) formed in the second region (2A) may be arranged at positions that do not overlap each other with respect to the thickness direction of the display substrate.

In addition, although not shown in the drawing, the 1-1st groove (G1-1) and the 1-2nd groove (G1-2) formed in the first region (1A) may also be arranged in a zigzag pattern with respect to each other. That is, the 1-1st groove (G1-1) and the 1-2nd groove (G1-2) formed in the first region (1A) may be arranged at positions where they do not overlap with respect to the thickness direction of the display substrate.

Fig. 16 is a drawing for explaining an example in which a display substrate according to embodiments is applied.

Referring to FIG. 16, a display substrate according to embodiments can be applied to a flexible display device that displays a display.

For example, the display substrate according to the embodiments can be applied to flexible display devices such as mobile phones and tablets.

These display substrates can be applied to flexible display devices such as flexible, bendable or foldable mobile phones and tablets.

The above display substrate can be applied to a flexible display device such as a flexible, bent or foldable mobile phone or tablet, and can improve the folding reliability in a display device that is repeatedly folded or restored, thereby improving the reliability of the flexible display device.

The features, structures, effects, etc. 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, etc. exemplified in each embodiment can be combined or modified and implemented in other embodiments by a person having ordinary knowledge in the field to which the embodiments belong. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the above has been described with reference to embodiments, these are merely examples and do not limit the present invention, and those with ordinary skill in the art to which the present invention pertains will recognize that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present embodiments. For example, each component specifically shown in the embodiments can be modified and implemented. In addition, the differences related to such modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

Claims (10)

A display substrate comprising one side and a side opposite to said one side, and being foldable with respect to a folding axis,
The above display substrate includes a first region adjacent to the folding axis and including the folding axis, and a second region provided on both sides of the first region and located further from the folding axis than the first region,
A first direction in which the folding axis extends and a second direction perpendicular to the first direction are defined,
The first region is provided with a plurality of hinge parts connected to both ends of the display substrate facing in the first direction, and a hole including a plurality of hole patterns that penetrate the one side and the other side and are spaced apart from each other in the first direction between the plurality of hinge parts.
The second region is provided with a groove provided on one side or the other side,
A display substrate, wherein the width of the hole pattern in the second direction on the one side or the other side is different from the width of the groove in the second direction on the one side or the other side. In paragraph 1,
A display substrate, wherein the width of the hole pattern in the second direction on the one side or the other side is smaller than the width of the groove in the second direction on the one side or the other side. In paragraph 1,
A display substrate, wherein the depth of the groove is less than half the thickness of the display substrate. In paragraph 1,
The above home,
Including a 2-1 groove provided on the above one side, and a 2-2 groove provided on the other side,
A display substrate in which the above-mentioned 2-1 groove and the above-mentioned 2-2 groove are arranged to overlap each other in the thickness direction of the display substrate. In paragraph 1,
The above home,
Including a 2-1 groove provided on the above one side, and a 2-2 groove provided on the other side,
A display substrate, wherein the above-mentioned 2-1 groove and the above-mentioned 2-2 groove are arranged so as to be misaligned with respect to the thickness direction of the display substrate. In paragraph 1,
A display substrate having a surface pore size (surface pore/depth) relative to the depth of the above groove of 0.5 to 3.0. In paragraph 1,
The above home is provided in multiple numbers along the second direction in the second region,
A display substrate in which the pitch between the plurality of grooves is larger than the size of the surface holes. In paragraph 1,
The second area above is,
Including a 2-1 region and a 2-2 region spaced apart from each other in the second direction with the first region interposed therebetween,
The above home is provided in each of the 2-1 area and the 2-2 area, a display substrate. In paragraph 1,
The above holes are provided in a plurality and are spaced apart from each other along the second direction within the above first region,
A display substrate, wherein each of the plurality of holes includes the plurality of hole patterns. In paragraph 1,
The above home is provided on the above surface,
The width of the hole pattern in the second direction on the above-mentioned one side is different from the width of the groove in the second direction on the above-mentioned one side,
A display substrate, wherein the width of the hole pattern in the second direction on the above surface is different from the width of the groove in the second direction on the above surface.

Images