Window portion and display device including the same

Abstract

One embodiment may provide a window portion and a display device including the same. The window portion includes: a glass substrate; an impact absorbing layer, which is disposed on the glass substrate and has a first storage modulus; and a coating layer, which is disposed on at least one of an upper surface and a lower surface of the impact absorbing layer and has a second storage modulus greater than the first storage modulus, wherein a ratio of a first thickness of the impact absorbing layer to a second thickness of the coating layer is 1:0.0002 to 1:0.05, thereby improving impact resistance while maintaining foldable properties.

Description

Technical Field

[0001] The present invention relates to a window portion and a display device including the same, and more particularly, to a window portion having a foldable property and improved impact resistance and a display device including the same. Background Art

[0002] The display device displays various images on the display screen to provide information to the user. Generally, the display device displays information within the assigned screen. In recent years, various flexible display devices including foldable flexible display panels are being developed. Flexible display devices are different from rigid display devices and can be folded, rolled or bent. Flexible display devices that can change shape in various ways can be carried without being restricted by the size of the screen in the past, thereby improving the convenience of the user.

[0003] On the other hand, the foldable display device is required to have a soft property. In order to have a soft property, the thickness of the foldable display device should be thin, but the thinner the thickness, the lower the impact resistance, so there is a problem of being weak to external impact. Summary of the invention

[0004] An object of the present invention is to provide a window portion including a thin coating layer disposed on an impact absorbing layer and capable of improving impact resistance while maintaining foldability.

[0005] An object of the present invention is to provide a display device including a window portion capable of improving impact resistance while maintaining a foldable property, thereby preventing damage to a display panel due to an external impact.

[0006] One embodiment provides a window portion, comprising: a glass substrate; an impact absorbing layer, disposed on the glass substrate and having a first storage modulus; and a coating layer, disposed on at least one of an upper surface and a lower surface of the impact absorbing layer and having a second storage modulus greater than the first storage modulus, wherein a ratio of a first thickness of the impact absorbing layer to a second thickness of the coating layer is 1:0.0002 to 1:0.05.

[0007] The first thickness may be greater than or equal to 20 μm and less than or equal to 50 μm, and the second thickness may be greater than or equal to 0.01 μm and less than or equal to 1 μm.

[0008] The glass substrate may have a thickness of 20 μm or more and 70 μm or less.

[0009] It may be that the ratio of the first storage modulus to the second storage modulus is 1:4 to 1:15.

[0010] The first storage modulus may be greater than or equal to 4 GPa and less than or equal to 10 GPa, and the second storage modulus may be greater than or equal to 40 GPa and less than or equal to 60 GPa.

[0011] The coating layer may include at least one of epoxy silan, silsesquioxane, imine and silazane.

[0012] The impact absorbing layer may include at least one of polyimide, polyethylene terephthalate, polycarbonate, cycloolefin polymer, and triacetyl cellulose.

[0013] The coating layer may be formed by deposition using a thermal deposition device, an electron beam (E-beam) deposition device, or a sputtering device.

[0014] It may be that the window portion includes: a folding area, which is folded along a folding axis extending in one direction; and a first non-folding area and a second non-folding area, which are spaced apart from each other, and the folding area is provided between the first non-folding area and the second non-folding area.

[0015] The coating layer may include: a first coating layer overlapping the first unfolded region; and a second coating layer overlapping the second unfolded region and spaced apart from the first coating layer.

[0016] The window portion may further include an adhesive layer disposed on the coating layer, wherein the adhesive layer fills a space between the first coating layer and the second coating layer.

[0017] The coating layer may include a first sub-coating layer and a second sub-coating layer which are sequentially stacked on the impact absorbing layer.

[0018] The sum of the thicknesses of the first sub-coating layer and the second sub-coating layer may be greater than or equal to 0.01 μm and less than or equal to 1 μm.

[0019] The first sub-coating layer and the second sub-coating layer may include at least one of epoxy silan, silsesquioxane, imine, and silazane.

[0020] The window portion may further include: a protective layer, which is disposed on the glass substrate and includes at least one of polyimide, polyethylene terephthlate, polycarbonate, cycloolefin polymer and triacetylcellulose.

[0021] The window portion may further include an adhesive layer disposed at least one of between the protective layer and the glass substrate and between the glass substrate and the impact absorbing layer.

[0022] Other embodiments provide a display device, including: a display panel; and a window portion, arranged on the display panel, the window portion including: a glass substrate; an impact absorbing layer, arranged on the glass substrate and having a first storage modulus; and a coating layer, arranged on at least one of an upper surface and a lower surface of the impact absorbing layer and having a second storage modulus greater than the first storage modulus, wherein a ratio of a first thickness of the impact absorbing layer to a second thickness of the coating layer is 1:0.0002 to 1:0.05.

[0023] It may be that the display device further includes: a protective layer arranged on the upper portion of the glass substrate; and an adhesive layer arranged at at least one position between the protective layer and the glass substrate, between the glass substrate and the impact absorbing layer, and between the impact absorbing layer and the display panel.

[0024] The adhesive layer may have a thickness of 10 μm or more and 100 μm or less.

[0025] The adhesive layer may be a pressure sensitive adhesive.

[0026] (Effects of the Invention)

[0027] The window portion of one embodiment further includes a thin coating layer disposed on the impact absorbing layer, so that the impact resistance property can be improved while maintaining the foldable property.

[0028] A display device according to an embodiment includes a window portion that can improve impact resistance while maintaining a foldable property, thereby preventing damage to a display panel caused by an external impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1a is a three-dimensional diagram of a display device according to an embodiment.

[0030] Figure 1b It is a perspective view showing a folded state of a display device according to an embodiment.

[0031] Figure 2a It is an exploded perspective view of a display device according to an embodiment.

[0032] Figure 2b is a display device of an embodiment along Figure 1a Cross-sectional view of Ⅰ-Ⅰ′.

[0033] Figure 3a is a display device of an embodiment along Figure 2a Cross-sectional view of II-II′.

[0034] Figure 3b is a display device of an embodiment along Figure 2a Cross-sectional view of II-II′.

[0035] Figure 3c is a display device of an embodiment along Figure 2a Cross-sectional view of II-II′.

[0036] Figure 4 is a display device of an embodiment along Figure 2a Cross-sectional view of II-II′.

[0037] Figure 5a is a display device of an embodiment along Figure 2a Cross-sectional view of II-II′.

[0038] Figure 5b is a display device of an embodiment along Figure 2a Cross-sectional view of II-II′.

[0039] Figure 6a is a display device of an embodiment along Figure 2a Cross-sectional view of II-II′.

[0040] Figure 6b is a display device of an embodiment along Figure 2a Cross-sectional view of II-II′.

[0041] (Explanation of symbols)

[0042] Display device: DD; Window: WM;

[0043] Display panel: DP; Glass substrate: GL;

[0044] Shock absorbing layer: AL; Upper surface: TAA;

[0045] Lower surface: BAA; Coating layer: CL;

[0046] Upper coating layer: TCL; Lower coating layer: BCL. DETAILED DESCRIPTION

[0047] The present invention may have various changes and various forms, and specific embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the present invention to a specific disclosed form, and it should be understood that it includes all changes, equivalents and substitutes included in the concept and technical scope of the present invention.

[0048] In this specification, when a certain component (or region, layer, part, etc.) is mentioned as being located on, connected to or combined with other components, it means that it can be directly configured / connected / combined on the other components, or a third component can be configured in between.

[0049] The same symbols refer to the same components. In addition, in each of the drawings, the thickness, ratio, and size of each component are exaggerated for the effective description of the technical content.

[0050] "And / or" includes more than one combination of all possible defined related components.

[0051] The terms first, second, etc. may be used to describe various constituent elements, but the constituent elements shall not be limited to the terms. The terms are used only for the purpose of distinguishing one constituent element from other constituent elements. For example, without exceeding the scope of the present invention, the first constituent element may be named as the second constituent element, and similarly, the second constituent element may be named as the first constituent element. The expression of the singular includes the expression of the plurality when there is no clear contrary meaning in the text.

[0052] The case where one configuration is arranged on other configurations includes the case where one configuration is arranged above or below other configurations.

[0053] In addition, the terms such as “below”, “on the lower side”, “above”, and “on the upper side” are used to explain the connection relationship between the components shown in the drawings. The above terms are relative concepts and are explained based on the directions shown in the drawings.

[0054] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this specification have the same meaning as those generally understood by those skilled in the art. In addition, such terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant technology, and should not be interpreted as an idealized or overly formal meaning unless clearly defined in this application.

[0055] Terms such as “including” or “having” should be understood to refer to the existence of features, numbers, steps, operations, constituent elements, parts or combinations thereof recorded in the specification, and do not exclude in advance the existence or additional possibility of one or more other features, numbers, steps, operations, constituent elements, parts or combinations thereof.

[0056] Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings.

[0057] Figure 1a is a three-dimensional diagram of a display device according to an embodiment. Figure 1b FIG. 1 is a perspective view showing a folded state of a display device according to an embodiment of the present invention. Figure 1a and Figure 1b A display device DD according to an embodiment will be described.

[0058] Reference Figure 1a and Figure 1b , a display device DD involved in one embodiment includes a display surface IS for displaying an image. The display surface IS for displaying the image IM is parallel to the surface defined by the first direction axis DR1 and the second direction axis DR2. The normal direction of the display surface IS (i.e., the thickness direction of the display device DD) refers to the third direction axis DR3. The front surface (or upper surface) and the back surface (or lower surface) of each component are distinguished by the third direction axis DR3. However, hereinafter, the first direction to the third direction are the directions respectively referred to by the first direction axis DR1 to the third direction axis DR3, and the same symbols are referred to. On the other hand, the directions referred to by the first direction DR1 to the third direction DR3 are relative concepts and can be transformed into different directions. In the present embodiment, a foldable display device is shown, but the present invention is not limited to this, and the display device DD involved in one embodiment may be a rigid display device.

[0059] The display device DD involved in one embodiment may be a foldable display device or a rolled display device. The display device DD involved in one embodiment of the present invention may be represented by large electronic devices such as televisions and display screens, and may also be used in small and medium-sized electronic devices such as mobile phones, tablets, car navigation systems, game consoles, smart watches, etc.

[0060] The display surface IS of the display device DD of an embodiment may include a plurality of regions. The display device DD may include a display region DD-DA for displaying an image IM and a non-display region DD-NDA adjacent to the display region DD-DA. The non-display region DD-NDA of the display device DD may be a region where no image is displayed. Figure 1a and Figure 1bIM, an application icon and a clock shape are shown as an example of the image IM. The display area DD-DA may be a quadrilateral shape. The non-display area DD-NDA of the display device DD may surround the display area DD-DA. However, this is not limited to this, and the shape of the display area DD-DA and the shape of the non-display area DD-NDA may be relatively changed.

[0061] A display device DD according to an embodiment can be folded with a folding axis FX as a reference. Through user operation, when the display device DD is folded with the folding axis FX as a reference, the display device DD can include a folding area DD-FA and non-folding areas DD-NFA1 and DD-NFA2 spaced apart from each other, wherein the folding area DD-FA is provided between the non-folding areas DD-NFA1 and DD-NFA2.

[0062] As the display device DD involved in one embodiment is folded inwardly with the folding axis FX as the center, the display surface IS of the display device DD can be bent with the folding axis FX as the center, and the display surface IS of the display device DD divided by the folding axis FX is bent in a manner facing each other, and the back side (not shown) opposite to the display surface IS is exposed to the outside.

[0063] Although not shown in the figure, the display device DD involved in one embodiment can be folded outward with the folding axis FX as a reference, so that the display surface IS is exposed to the outside, and the back side which is the opposite side of the display surface IS is bent with the folding axis FX as a reference, so that the back side (not shown) divided with the folding axis FX as a reference is bent in a manner facing each other.

[0064] exist Figure 1a and Figure 1b , one folding area DD-FA and non-folding areas DD-NFA1 and DD-NFA2 are shown, but the number of folding areas DD-FA and non-folding areas DD-NFA1 and DD-NFA2 is not limited thereto. For example, the display device DD may include a plurality of non-folding areas greater than two and a plurality of folding areas disposed between the non-folding areas.

[0065] Figure 2a is a three-dimensional diagram of a display device according to an embodiment. Figure 2b A display device according to an embodiment of the present invention is provided along Figure 1a The following is a cross-sectional view of Ⅰ-Ⅰ′. Figure 2a and Figure 2b , a display device DD according to an embodiment is described in detail.

[0066] Reference Figure 2a and Figure 2bA display device DD according to an embodiment may include a display panel DP, a window portion WM disposed on an upper portion of the display panel DP, and an adhesive layer PADL disposed between the display panel DP and the window portion WM.

[0067] In one embodiment, the display panel DP includes a display area DA and a non-display area NDA on a plane. The display area DA and the non-display area NDA of the display panel DP correspond to the display device DD ( Figure 1a ) display area DD-DA( Figure 1a ) and non-display area DD-NDA( Figure 1a The display area DA and the non-display area NDA of the display panel DP do not necessarily need to be aligned with the display device DD ( Figure 1a ) display area DD-DA( Figure 1a ) and non-display area DD-NDA( Figure 1a ) is the same and can be changed according to the structure / design of the display panel DP.

[0068] In one embodiment, the display panel DP may include a folding area FA and non-folding areas NFA1 and NFA2 on a plane. The folding area FA and non-folding areas NFA1 and NFA2 of the display panel DP correspond to the display device DD ( Figure 1a ) of the folding region DD-FA( Figure 1a ) and the non-folding regions DD-NFA1, DD-NFA2 ( Figure 1a ).

[0069] Although not shown, in one embodiment, the display panel DP may include a plurality of signal lines and a plurality of pixels. A region where the plurality of pixels are configured may be defined as a display region DA, and a non-display region NDA may be defined along a border of the display region DA.

[0070] The signal lines include a plurality of gate lines, a plurality of data lines, a power line, and a plurality of control signal lines. Each gate line is connected to a corresponding pixel among a plurality of pixels, and each data line is connected to a corresponding pixel among a plurality of pixels. The power line is connected to a plurality of pixels. A gate drive circuit connected to the gate lines may be configured on one side of the non-display area NDA. The control signal line may provide a control signal to the gate drive circuit.

[0071] The plurality of gate lines, the plurality of data lines, the power lines and the plurality of control signal lines may respectively include a signal wiring portion and a display panel pad connected to an end of the signal wiring portion. The signal wiring portion may be defined as a portion of each of the plurality of gate lines, the plurality of data lines, the power lines and the control signal lines excluding the display panel pad.

[0072] The window portion WM may include a folding area W-FA and spaced non-folding areas W-NFA1 and W-NFA2 on a plane, wherein the folding area W-FA is provided between the non-folding areas W-NFA1 and W-NFA2. The folding area W-FA of the window portion WM overlaps with the folding area FA of the display panel DP, and the non-folding areas W-NFA1 and W-NFA2 of the window portion WM overlap with the non-folding areas NFA1 and NFA2 of the display panel DP, respectively.

[0073] The window portion WM may include a transmissive region TA overlapping the display area DA and a frame region BZA overlapping the non-display area NDA. The transmissive region TA may allow the image IM ( Figure 1a ) is transmitted and emitted to the outside. The frame area BZA may surround the transmission area TA. However, this is an example, and the frame area BZA may be configured adjacent to only one side of the transmission area TA, or may be omitted. The display device DD involved in one embodiment of the present invention may include various embodiments, and is not limited to any one embodiment.

[0074] The window portion WM may include a glass substrate GL, a shock absorbing layer AL disposed at a lower portion of the glass substrate GL, an adhesive layer WADL bonding the glass substrate GL and the shock absorbing layer AL, and a coating layer CL disposed on the shock absorbing layer AL. However, the adhesive layer WADL may be omitted, or the shock absorbing layer AL may be directly disposed on the glass substrate GL without the adhesive layer WADL. The stacked structure of the window portion WM will be described in more detail later.

[0075] Figure 3a to Figure 3c Respectively represent the window portion of an embodiment Figure 2a The following is a cross-sectional view of II-II′. Figure 3a to Figure 3c , describing in detail the window parts WM-a, WM-b, and WM-c involved in one embodiment.

[0076] Reference Figure 3a to Figure 3c The window portions WM-a, WM-b, and WM-c may include a glass substrate GL, a shock absorbing layer AL disposed on the glass substrate GL, and at least one coating layer TCL, BCL disposed on the upper surface TAA or the lower surface BAA of the shock absorbing layer AL. The coating layer CL disposed on the upper surface TAA is defined as an upper coating layer TCL ( Figure 3a ), the coating layer CL disposed on the lower surface BAA is defined as the lower coating layer BCL ( Figure 3b The impact absorbing layer AL is disposed on the glass substrate GL. Figure 3a to Figure 3c This is the case where the impact absorbing layer AL is disposed at the lower portion of the glass substrate GL.

[0077] The impact absorbing layer AL may include at least one of polyimide, polyethylene terephthlate, polycarbonate, cycloolefin polymer, and triacetyl cellulose. The impact absorbing layer AL serves to absorb external impact to reduce the impact of the display panel DP (displayed below the window portions WM-a, WM-b, and WM-c) disposed thereon. Figure 2a )The function of transmitting the impact.

[0078] The coating layers TCL and BCL may include at least one of epoxy silan, silsesquioxane, imine and silazane. If an external impact is applied to the window portions WM-a, WM-b, and WM-c, the coating layers TCL and BCL may disperse the external impact toward the second direction DR2. The coating layers TCL and BCL may be formed by deposition using a thermal deposition device, an electron beam (E-beam) deposition device, or a sputtering deposition device.

[0079] The impact absorbing layer AL may have a first storage modulus, and the coating layers TCL and BCL may have a second storage modulus greater than the first storage modulus. The first storage modulus may be above 4 GPa and below 10 GPa, and the second storage modulus may be above 40 GPa and below 60 GPa. The storage modulus was measured at room temperature using a nano indenter. The ratio of the first storage modulus to the second storage modulus may be 1:4 to 1:15. The second storage modulus may be more than four times and less than 15 times the size of the first storage modulus.

[0080] The impact absorbing layer AL may have a first thickness T 1 The coating layers TCL and BCL may have a thickness less than the first thickness T 1 The second thickness T 2 The first thickness T 1 The second thickness T may be greater than or equal to 20 μm and less than or equal to 50 μm. 2 The first thickness T may be greater than 0.01 μm and less than 1 μm. 1When it is less than 20 μm, the impact resistance of the windows WM-a, WM-b, and WM-c will decrease. When it exceeds 50 μm, the bending torque (BT) of the windows WM-a, WM-b, and WM-c will increase, which may reduce the foldability.

[0081] At the second thickness T 2 When the thickness is less than 0.01 μm, the impact resistance of the windows WM-a, WM-b, and WM-c will be reduced, and when the thickness exceeds 1 μm, the bending torque (BT) of the windows WM-a, WM-b, and WM-c will increase, which may reduce the foldability. 1 With the second thickness T 2 The ratio may be 1:0.0002 to 1:0.05. The thickness of the coating layers TCL and BCL may be greater than 0.0002 times and less than 0.05 times the thickness of the impact absorbing layer AL.

[0082] In one embodiment, the glass substrate GL may include tempered glass for protecting the surface of the display device DD. In one embodiment, the glass substrate GL may include flexible glass that can be folded. In one embodiment, the glass substrate GL may be ultra-thin glass (UTG). A functional layer such as a fingerprint prevention layer or a hard coating layer may be further included on the upper portion of the glass substrate GL.

[0083] The thickness T of the glass substrate GL G It can be between 20 μm and 50 μm. When the thickness of the glass substrate GL is less than 20 μm, the impact resistance of the windows WM-a, WM-b, and WM-c may be reduced, and when the thickness exceeds 50 μm, the foldability of the windows WM-a, WM-b, and WM-c may be reduced.

[0084] Figure 4 The window portion of an embodiment is along Figure 2a The following is a cross-sectional view of II-II′. Figure 4 The window portion WM-1 of an embodiment is described in detail. Figures 1a to 3c The above contents are the same, and the differences are described in detail below. Figures 1a to 3c The difference between the above embodiments is that the upper coating layer TCL ( Figure 3a ) is not a single layer, but a plurality of layers in which the first sub-coating layer S-TCL1 and the second sub-coating layer S-TCL2 are stacked in sequence.

[0085] The upper coating layer TCL1 of the window portion WM-1 of an embodiment may include a first sub-coating layer S-TCL1 and a second sub-coating layer S-TCL2 sequentially stacked on the impact absorbing layer AL. The thickness T of the first sub-coating layer S-TCL1 is a and the thickness T of the second sub-coating layer S-TCL2 b The sum T2 may be greater than or equal to 0.01 μm and less than or equal to 1 μm. The first sub-coating layer S-TCL1 and the second sub-coating layer S-TCL2 may each independently include at least one of epoxy silan, silsesquioxane, imine, and silazane.

[0086] The second sub-coating layer S-TCL2 disperses the external impact toward the second direction DR2 to mitigate the external impact transmitted to the first sub-coating layer S-TCL1. The first sub-coating layer S-TCL1 disperses the external impact through the second sub-coating layer S-TCL2 toward the second direction DR2, thereby mitigating the impact transmitted to the impact absorbing layer AL. Figure 4 2 shows a case where two coating layers are stacked, but this is an example, and in the present invention, the coating layer CL may be a plurality of coating layers stacked three or more.

[0087] Figure 5a and Figure 5b The window portion of one embodiment is respectively along Figure 2a The following is a cross-sectional view of II-II′. Figure 5a and Figure 5b The window portion WM-2 of an embodiment is described in detail. Figures 1a to 3c The contents are the same as those described above, and the differences are described in detail below. The window portion WM-2 of this embodiment is the same as that of the reference Figures 1a to 3c The difference between the above embodiments is that the upper coating layer TCL ( Figure 3a ) is discontinuous, and the first coating layer TCL-a and the second coating layer TCL-b are separated by a gap.

[0088] Reference Figure 5a In one embodiment, the upper coating layer TCL2 of the window portion WM-2 may include a first coating layer TCL-a overlapping the first non-folding area W-NFA1 and a second coating layer TCL-b overlapping the second non-folding area W-NFA2 and spaced apart from the first coating layer TCL-a. The empty space ES defined between the first coating layer TCL-a and the second coating layer TCL-b may correspond to the folding area W-FA. By including the empty space ES defined by the first coating layer TCL-a and the second coating layer TCL-b being spaced apart, the bending torque of the folding area W-FA may be reduced to increase the folding characteristics.

[0089] Reference Figure 5b The window portion WM-2 of one embodiment may further include an adhesive layer WADL-a connected to the first coating layer TCL-a and the second coating layer TCL-b, the impact absorbing layer AL, and the glass substrate GL. The adhesive layer WADL-a may fill between the first coating layer TCL-a and the second coating layer TCL-b. The thickness of the adhesive layer WADL-a in the area overlapping with the folding area W-FA may be thicker than the thickness of the area overlapping with the non-folding areas W-NFA1 and W-NFA2.

[0090] Figure 6a and Figure 6b The window portion of one embodiment is respectively along Figure 2a The following is a cross-sectional view of II-II′. Figure 6a and Figure 6b The window portion WM-3 of an embodiment is described in detail. Figures 1a to 3c The contents are the same as those described above, and the differences are described in detail below. The window portion WM-3 of this embodiment is the same as that of the reference Figures 1a to 3c The difference between the above embodiments is that a protection layer PL is further included.

[0091] The window portion WM-3 of one embodiment may further include a protective layer PL disposed on the upper portion of the glass substrate GL. The protective layer PL may protect the glass substrate GL and the display panel DP disposed thereunder. The protective layer PL may include at least one of polyimide, polyethylene terephthalate, polycarbonate, cycloolefin polymer, and triacetylcellulose.

[0092] The window portion WM-3 of one embodiment may further include an adhesive layer WADL1 disposed between the glass substrate GL and the protective layer PL and an adhesive layer WADL2 disposed between the glass substrate GL and the impact absorbing layer AL. Each adhesive layer WADL1 and WADL2 may be a pressure sensitive adhesive.

[0093] Reference Figure 2b and Figure 6b In the display device DD of an embodiment, at least one adhesive layer WADL1, WADL2, PADL ( Figure 2b and Figure 6b ).

[0094] The thickness of the adhesive layers WADL1 and WADL2 may be 10 μm to 100 μm. If the thickness of the adhesive layers WADL1 and WADL2 is less than 10 μm, the impact resistance of the window WM-3 may be reduced, and if the thickness is greater than 100 μm, the foldability may be reduced.

[0095] The present invention will be described in more detail below through specific examples and comparative examples. The following examples are merely illustrative for understanding the present invention, and the scope of the present invention is not limited thereto.

[0096] The thickness of each structure included in the window portion of Example 1, Example 2, and Comparative Example is shown in the following Table 1. In the following Table 1, the thickness of a structure represented as "0" means that the corresponding structure is not included.

[0097] [Table 1]

[0098]

[0099]

[0100] Table 2 below shows the experimental results of the pen drop test on the windows of Example 1, Example 2 and Comparative Example. The pen drop test is to evaluate the time when cracks are generated in the window component when the pen is dropped from a certain height, thereby evaluating the height at which the cracks start to generate. The pen used in the experiment weighed 5.7 g and the ball had a diameter of 0.7 mm. The height of the cracks generated was the average value obtained after 15 measurements.

[0101] Window Pen drop test (cm) Example 1 5.27 Example 2 5.80 Comparative Example 5.10

[0102] Referring to Table 2, the window portion of each embodiment including the lower coating layer has a higher pen drop height than the comparative example, which shows that the impact resistance is enhanced. In addition, when comparing Example 1 with Example 2, it can be seen that the case where the coating layer is formed on both sides of the impact absorbing layer has a further improved impact resistance than the case where the coating layer is formed on one side of the impact absorbing layer.

[0103] One embodiment includes a glass substrate, an impact absorbing layer disposed at a lower portion of the glass substrate, and a thin coating layer disposed on at least one of an upper surface or a lower surface of the impact absorbing layer, thereby providing a window portion having improved impact resistance while maintaining foldability.

[0104] One embodiment includes a display panel and a window portion arranged on the upper part of the display panel, and the window portion includes a glass substrate, an impact absorbing layer arranged on the lower part of the glass substrate, and a thin coating layer arranged on at least one of the upper surface or the lower surface of the impact absorbing layer, thereby providing a display device that protects the display panel from the influence of external impact.

[0105] The above description is made with reference to the preferred embodiments of the present invention, but those skilled in the art or those skilled in the art should be able to understand that various modifications and changes can be made to the present invention without exceeding the scope of the concept and field of the present invention recorded in the claims. Therefore, the technical scope of the present invention is not limited to the contents recorded in the detailed description of the specification, but should be determined only by the claims.

Claims

1. A window portion, comprising: Glass substrate; An impact absorbing layer, disposed on the glass substrate and having a first storage modulus; as well as a coating layer disposed on the upper surface and the lower surface of the impact absorbing layer and having a second storage modulus greater than the first storage modulus, A ratio of a first thickness of the impact absorbing layer to a second thickness of the coating layer is 1:0.0002 to 1:0.

05.

2. The window portion according to claim 1, wherein: The first thickness is greater than or equal to 20 μm and less than or equal to 50 μm, and the second thickness is greater than or equal to 0.01 μm and less than or equal to 1 μm, The glass substrate has a thickness of not less than 20 μm and not more than 70 μm.

3. The window portion according to claim 1, wherein: The ratio of the first storage modulus to the second storage modulus is 1:4 to 1:15, The first storage modulus is greater than or equal to 4 GPa and less than or equal to 10 GPa, and the second storage modulus is greater than or equal to 40 GPa and less than or equal to 60 GPa.

4. The window portion according to claim 1, wherein: The coating layer includes at least one of epoxy silane, silsesquioxane, imine and silazane.

5. The window portion according to claim 1, wherein: The impact absorbing layer includes at least one of polyimide, polyethylene terephthalate, polycarbonate, cycloolefin polymer, and cellulose triacetate.

6. The window portion according to claim 1, wherein: The coating layer is formed by deposition using a thermal deposition device, an electron beam deposition device or a sputtering device.

7. The window portion according to claim 1, wherein: The window portion comprises: a folding region folded along a folding axis extending in one direction; and The first non-folding region and the second non-folding region are spaced apart from each other, and the folding region is provided between the first non-folding region and the second non-folding region.

8. The window portion according to claim 7, wherein: The coating layer comprises: a first coating layer overlapping the first unfolded area; and The second coating layer overlaps the second unfolded area and is spaced apart from the first coating layer.

9. A display device, comprising: Display panel; as well as a window portion, arranged on the display panel, The window portion comprises: Glass substrate; an impact absorbing layer, disposed on the glass substrate and having a first storage modulus; and a coating layer disposed on the upper surface and the lower surface of the impact absorbing layer and having a second storage modulus greater than the first storage modulus, A ratio of a first thickness of the impact absorbing layer to a second thickness of the coating layer is 1:0.0002 to 1:0.

05.

10. The display device according to claim 9, further comprising: an adhesive layer disposed at at least one position between the glass substrate and the impact absorbing layer and between the impact absorbing layer and the display panel, The thickness of the adhesive layer is greater than or equal to 10 μm and less than or equal to 100 μm.

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