Display device

Abstract

A display device is provided. As a display device including a folding region, the display device includes a display panel, a first protective member disposed on the display panel, a second protective member disposed on the first protective member, a first adhesive member disposed between the display panel and the first protective member, and a second adhesive member disposed between the first protective member and the second protective member and having a modulus equal to or less than a modulus of the first adhesive member.

Description

Technical Field

[0001] This invention relates to a display device. Background Technology

[0002] With the development of the information society, the requirements for display devices used to display images are increasing in various forms. For example, display devices are used in various electronic devices such as smartphones, digital cameras, laptops, navigation systems, and smart TVs.

[0003] Foldable displays have recently garnered significant attention. They offer a wide screen while maintaining high portability, combining the advantages of smartphones and tablets. The protective film for foldable displays requires high durability to protect the internal structure and high flexibility to ensure smooth folding. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a display device including a protective film that can simultaneously ensure impact resistance and flexural strength.

[0005] The subject matter of this invention is not limited to the subject matter mentioned above, and another subject matter not mentioned will be clearly understood by those skilled in the art from the following description.

[0006] A display device according to one embodiment for solving the above-mentioned problems includes a folding region. The display device includes: a display panel; a first protective member disposed on the display panel; a second protective member disposed on the first protective member; a first adhesive member disposed between the display panel and the first protective member; and a second adhesive member disposed between the first protective member and the second protective member, and having a modulus equal to or less than the modulus of the first adhesive member.

[0007] Alternatively, the modulus of the first adhesive component and the modulus of the second adhesive component may be elastic moduli, and may be determined by dynamic mechanical analysis.

[0008] It is possible that the modulus of the first adhesive component is in the range of greater than 0 kPa and less than 150 kPa at -20°C, and the modulus of the second adhesive component is in the range of greater than 0 kPa and less than 150 kPa at -20°C.

[0009] Alternatively, the first protective component may have a first thickness, and the second protective component may have a second thickness greater than the first thickness.

[0010] Alternatively, the first adhesive component may have a third thickness, and the second adhesive component may have a fourth thickness greater than the third thickness.

[0011] Alternatively, the folding area may include a first folding area and a second folding area that are separate from each other and extend in a first direction, wherein the display device folds inward with reference to the first folding area and folds outward with reference to the second folding area.

[0012] Alternatively, the display device may further include: a first non-foldable region disposed on one side of the first foldable region in a second direction intersecting the first direction; a second non-foldable region disposed between the first foldable region and the second foldable region; and a third non-foldable region disposed on the other side of the second direction of the second foldable region.

[0013] Alternatively, the display device may further include a display area for displaying an image and a non-display area disposed outside the display area, wherein the display area and the non-display area are disposed over the first folded area, the second folded area, the first non-folded area, the second non-folded area, and the third non-folded area.

[0014] It is possible that the energy storage modulus of the second protection component increases with increasing frequency.

[0015] It is possible that the increase in the energy storage modulus of the second protection component with increasing frequency is greater when the frequency of the second protection component is greater than that when the frequency of the second protection component is less than 1 Hz.

[0016] Alternatively, the energy storage modulus of the second protection component may be in the range of 6 GPa to 1000 GPa at a frequency of 1 Hz, and in the range of 8 GPa to 1000 GPa at a frequency of 30000 Hz. The energy storage modulus of the second protection component may be determined by dynamic mechanical analysis (DMA).

[0017] Alternatively, the second protective component may comprise at least one selected from polyethylene terephthalate (PET), triacetyl cellulose (TAC), transparent polyimide, and aramid.

[0018] It is possible that the energy storage modulus of the first protective component is in the range of 1000MPa to 2000MPa at -20℃ and in the range of 100MPa to 2000MPa at 85℃.

[0019] A display device according to one embodiment for solving the above-mentioned problems includes a first folding region and a second folding region that are separated from each other and extend in a first direction, the display device including: a display panel; a first protective member disposed on the display panel; a second protective member disposed on the first protective member, the energy storage modulus of which increases with increasing frequency; a first adhesive member disposed between the display panel and the first protective member; and a second adhesive member disposed between the first protective member and the second protective member, the display device being folded inward with respect to the first folding region and folded outward with respect to the second folding region.

[0020] It is possible that the increase in the energy storage modulus of the second protection component with increasing frequency is greater when the frequency of the second protection component is greater than that when the frequency of the second protection component is less than 1 Hz.

[0021] Alternatively, the energy storage modulus of the second protection component may be in the range of 6 GPa to 1000 GPa at a frequency of 1 Hz, and in the range of 8 GPa to 1000 GPa at a frequency of 30000 Hz. The energy storage modulus of the second protection component may be determined by dynamic mechanical analysis (DMA).

[0022] Alternatively, the second protective component may comprise at least one selected from polyethylene terephthalate (PET), triacetyl cellulose (TAC), transparent polyimide, and aramid.

[0023] Alternatively, the elastic modulus of the second adhesive component may be equal to or less than the elastic modulus of the first adhesive component.

[0024] It is possible that the energy storage modulus of the first protective component is in the range of 1000MPa to 2000MPa at -20℃ and in the range of 100MPa to 2000MPa at 85℃.

[0025] A display device according to one embodiment for solving the above-mentioned problems includes a first folding region and a second folding region that are separated from each other and extend in a first direction, the display device including a display panel; a first protective member disposed on the display panel; a second protective member disposed on the first protective member; a first adhesive member disposed between the display panel and the first protective member; and a second adhesive member disposed between the first protective member and the second protective member, wherein the energy storage modulus of the first protective member is in the range of 1000MPa to 2000MPa at -20°C and in the range of 100MPa to 2000MPa at 85°C.

[0026] Specific details of other embodiments are included in the detailed description and accompanying drawings.

[0027] According to one embodiment of the display device, the protective film of the display device can simultaneously ensure impact resistance and flexural strength.

[0028] The effects of the embodiments are not limited to the above examples, and more diverse effects are included in this specification. Attached Figure Description

[0029] Figure 1 This is a perspective view showing the unfolded state of a display device according to an embodiment.

[0030] Figure 2 This is a perspective view showing a display device in a folded state according to an embodiment.

[0031] Figure 3 This is a cross-sectional view of a display device in an open state according to an embodiment.

[0032] Figure 4 It is magnification Figure 3 An enlarged view of region A.

[0033] Figure 5 This is a cross-sectional view of a display device according to an embodiment, in a state of being folded in the first folding region.

[0034] Figure 6 It is magnification Figure 5 A magnified view of region B.

[0035] Figure 7 This is a cross-sectional view of a display device according to an embodiment, in a state where it is folded outward in the second folding region.

[0036] Figure 8 This is a graph showing the relationship between the modulus of a second protective component according to one embodiment and external impact.

[0037] Figure 9This is a cross-sectional view of a display panel according to one embodiment.

[0038] Figure 10 A cross-section of a display device according to another embodiment is shown. Figure 1 part.

[0039] Figure 11 A cross-section of a display device according to yet another embodiment is shown. Figure 1 part.

[0040] Figure 12 This is a perspective view showing the unfolded state of the display device according to yet another embodiment.

[0041] Figure 13 It shows the basis Figure 12 A perspective view of the folded state inside the display device of an embodiment.

[0042] Figure 14 It shows the basis Figure 12 A perspective view of the display device in an outward-folded state according to an embodiment.

[0043] (Explanation of reference numerals in the attached diagram)

[0044] 1: Display device 10: Display panel

[0045] 20: Anti-reflection component; 30: First protective component

[0046] 40: Second protective component PSA1: First adhesive component

[0047] PSA2: Second Adhesive Component; FDA: Folded Area

[0048] NFA: Non-folded region Detailed Implementation

[0049] References and Attachments Figure 1 From the embodiments described below, the advantages and features of the invention, as well as the methods of implementing them, will become clear. However, the invention is not limited to the embodiments described below and can be implemented in various forms that differ from each other. These embodiments are provided merely to complete the invention and to fully convey the scope of the invention to those skilled in the art to which it pertains. The invention is defined only by the scope of the claims.

[0050] The designation "on" of an element or layer includes all cases where it is directly on top of another element or in between, separated by another layer or element. Throughout the specification, the same reference numerals refer to the same constituent elements.

[0051] Although terms such as "first," "second," etc., are used to describe various constituent elements, it is clear that these constituent elements are not limited to these terms. These terms are used merely to distinguish one constituent element from others. Therefore, it is obvious that the first constituent element mentioned below can also be a second constituent element within the scope of the inventive concept.

[0052] The following description refers to the accompanying drawings and specific embodiments.

[0053] Figure 1 This is a perspective view showing the unfolded state of a display device according to an embodiment. Figure 2 This is a perspective view showing a display device in a folded state according to one embodiment. Figure 2 The image shows a display device 1 according to an embodiment in a state where it is in-folded with a first folding region FDA1 as a reference and out-folded with a second folding region FDA2 as a reference.

[0054] Reference Figure 1 as well as Figure 2 According to one embodiment, the display device 1 can display a screen or image through the display area DA (described later), and includes various devices including the display area DA. For example, the display device 1 according to the embodiments of this specification can be applied to various home appliances or Internet of Things devices such as mobile phones, tablet PCs, personal digital assistants (PDAs), portable multimedia players (PMPs), televisions, game consoles, watch-type electronic devices, head-mounted displays, personal computer monitors, laptops, car navigation systems, car dashboards, digital cameras, video cameras, external billboards, electronic screens, medical devices, examination devices, refrigerators, and washing machines, in addition to smartphones.

[0055] Display device 1 includes a display area DA and a non-display area NDA. The display area DA can display an image. The display area DA can include multiple pixels. The multiple pixels can be arranged in a matrix direction. The non-display area NDA may not be used for display. If display device 1 has touch functionality, display device 1 may also include a touch area for sensing touch input, and the touch area may overlap with the display area DA. Although not limited to this, the touch area may be substantially the same as the display area DA.

[0056] The shape of the display area DA can correspond to the shape of the display device 1 on which the display area DA is applied. The display area DA can be a rectangle with vertical corners or a rectangle with rounded corners on a plane. However, the planar shape of the display area DA is not limited to the rectangular shape illustrated in the figure, and can be circular, elliptical or other various shapes.

[0057] The accompanying drawings illustrate a case where the shorter side of the rectangle representing the display area DA extends along a first direction DR1, and the longer side extends along a second direction DR2 perpendicular to the first direction DR1. A third direction DR3 may be perpendicular to both the first direction DR1 and the second direction DR2, and refers to the thickness direction of the display device 1. However, the directions mentioned in the embodiments should be understood as relative directions, and the embodiments are not limited to the mentioned directions.

[0058] Unless otherwise defined, in this specification, "above," "on top," and "upper side" as used with reference to DR3 by a third party refer to the side of the display surface with reference to display panel 10, and "below," "under," and "lower side" refer to the opposite side of the display surface with reference to display panel 10.

[0059] The non-display area NDA can surround the perimeter of the display area DA. The non-display area NDA can surround all sides of the display area DA, but is not limited to this; the non-display area NDA may not be configured near at least a portion of the four sides of the display area DA. The border area of ​​the display device 1 can be configured as the non-display area NDA.

[0060] Display device 1 may be a foldable display device. In this specification, "foldable display device" refers to a display device that can be folded, meaning it can have both a folded state and a non-folded state. Furthermore, folding typically includes folding at an angle of approximately 180°, but is not limited to this. Folding angles exceeding or falling below 180°, such as bending at an angle of 90° or more but less than 180°, or 120° or more but less than 180°, can also be understood as folding. Additionally, even if the folded state is not fully folded, a state where the device is bent away from the non-folded state can also be referred to as a folded state. For example, even if the bending angle is less than 90°, as long as the maximum folding angle is 90° or more, it can be described as being in a folded state to distinguish it from the non-folded state.

[0061] Display device 1 may include folding regions FDA (FDA1, FDA2) (or folding lines). Folding regions FDA may include a first folding region FDA1 and a second folding region FDA2 that are separated from each other. The first folding region FDA1 may be configured on the second folding region FDA2 in a second direction DR2.

[0062] Each folding region FDA can extend in a direction parallel to one side of the display device 1. For example, each folding region FDA can extend in the direction of the shorter side of the display device 1 (first direction DR1). In the rectangular display device 1 shown exemplary in the figures, where the side extending in the second direction DR2 is longer than the side extending in the first direction DR1, if there is a folding region FDA extending in the first direction DR1, the longer side (the side extending in the second direction DR2) of the display device 1 can be reduced to half or less before and after folding, while the shorter side (the side extending in the first direction DR1) remains unchanged. In another embodiment, the folding region FDA can also extend in the same direction as the longer side (the side extending in the second direction DR2) (second direction DR2).

[0063] Each folded area FDA can also have a predetermined width in the second direction DR2. The width of each folded area FDA in the second direction DR2 can be very small compared to the width in the first direction DR1.

[0064] Display device 1 can be folded based on the folding area FDA. Folding can be divided into in-folding (folding with the display surface of display device 1 facing inward) and out-folding (folding with the display surface facing outward). Display device 1 can be folded using only one of the in-folding and out-folding methods, or both in-folding and out-folding can be implemented. Furthermore, in the case of a display device that implements both in-folding and out-folding, the in-folding and out-folding can be implemented based on the same folding area FDA, or it can include multiple folding areas that perform different folding methods, such as a dedicated in-folding area and a dedicated out-folding area. Figure 2 The image shows the display device 1 in a state where it is folded inward with reference to the first folding area FDA1 and folded outward with reference to the second folding area FDA2.

[0065] Display device 1 may include a non-foldable region NFA disposed around the foldable region FDA. The non-foldable region NFA may include a first non-foldable region NFA1 located on one side of the first foldable region FDA1 in a second direction DR2, a second non-foldable region NFA2 located on the other side of the first foldable region FDA1 in a second direction DR2, and a third non-foldable region NFA3 located on the other side of the second foldable region FDA2 in a second direction DR2. In other words, the second non-foldable region NFA2 may be disposed between the first foldable region FDA1 and the second foldable region FDA2. Specifically, the first non-foldable region NFA1 may place the first foldable region FDA1 between the first foldable region FDA1 on one side of the second non-foldable region NFA2 in a second direction DR2, and the third non-foldable region NFA3 may place the second foldable region FDA2 between the second non-foldable region NFA2 on the other side of the second non-foldable region NFA2 in a second direction DR2.

[0066] The second direction DR2 widths of the first non-folded region NFA1, the second non-folded region NFA2, and the third non-folded region NFA3 can be the same as each other, but are not limited thereto. Depending on the position of the folded region FDA, the second direction DR2 widths of the first non-folded region NFA1, the second direction DR2 widths of the second non-folded region NFA2, and the third non-folded region NFA3 can also be different from each other.

[0067] The display area DA, non-display area NDA, folding area FDA, and non-folding area NFA of the aforementioned display device 1 can overlap at the same locations. For example, a specific location may be where the display area DA is simultaneously with the first non-folding area NFA1. Another specific location may be where the non-display area NDA is simultaneously with the first non-folding area NFA1. Yet another specific location may be where the display area DA is simultaneously with the folding area FDA.

[0068] The display area DA can be configured to cover the entirety of the first non-folding area NFA1, the second non-folding area NFA2, and the third non-folding area NFA3. Furthermore, the display area DA can also be configured in the folded area FDA, which corresponds to the boundaries of the first non-folding area NFA1, the second non-folding area NFA2, and the third non-folding area NFA3. That is, the display area DA of the display device 1 can be continuously configured regardless of the boundaries of the non-folding areas NFA, the folded area FDA, etc. However, it is not limited to this; it is also possible to configure the display area DA only in at least any one of the first non-folding areas NFA1, the second non-folding area NFA2, and the third non-folding area NFA3, or to configure the display area DA in the first non-folding areas NFA1, the second non-folding area NFA2, and the third non-folding area NFA3, but not in the folded area FDA.

[0069] Figure 3 This is a cross-sectional view of a display device in an open state according to an embodiment. Figure 4 It is magnification Figure 3 An enlarged view of region A. Figure 5 This is a cross-sectional view of a display device according to an embodiment, in a state of being folded in the first folding region. Figure 6 It is magnification Figure 5 A magnified view of region B. Figure 7 This is a cross-sectional view of a display device according to an embodiment, in a state where it is folded outward in the second folding region.

[0070] Reference Figures 3 to 7 The display device 1 may include a display panel 10, a reflection-preventing member 20, a first adhesive member PSA1, a first protective member 30, a second adhesive member PSA2, and a second protective member 40, which are sequentially stacked on one side of the thickness direction (third direction DR3) of the display panel 10, and a polymer film layer FL, a buffer layer CU, and a heat dissipation member HP, which are sequentially stacked on the other side of the thickness direction (third direction DR3) of the display panel 10. However, it is not limited to this, and other layers may be disposed between each layer, or a part of each stacked member may be omitted. In addition, at least one bonding member such as an adhesive layer or bonding layer may be disposed not only between the reflection-preventing member 20 and the first protective member 30 and between the first protective member 30 and the second protective member 40, but also between each stacked member to bond adjacent stacked members.

[0071] Display panel 10 serves as a panel for displaying images or displays. Examples of its use include not only self-emissive display panels such as organic light-emitting display panels, inorganic light-emitting display panels, quantum dot light-emitting display panels, micro LED display panels, nano LED display panels, plasma display panels, field emission display panels, and cathode ray tube display panels, but also light-receiving display panels such as liquid crystal display panels and electrophoretic display panels. Hereinafter, an organic light-emitting display panel will be used as an example of display panel 10. Unless otherwise specified, the organic light-emitting display panel used in the embodiments will be simply referred to as a display panel. However, the embodiments are not limited to organic light-emitting display panels, and other display panels listed above or known in the art can be used within the scope of the shared technical concept. The detailed structure of display panel 10 will be described later.

[0072] A reflection-prevention component 20 can be disposed above the display panel 10. The reflection-prevention component 20 can reduce the reflection of external light. The reflection-prevention component 20 can be provided in the form of a polarizing film. In this case, the reflection-prevention component 20 polarizes the transmitted light. Alternatively, the reflection-prevention component 20 can also be provided as a color filter layer within the display panel 10.

[0073] A first protective member 30 may be disposed above the anti-reflection member 20. The first protective member 30 serves to cover and protect the display panel 10. The first protective member 30 may be flexible and bendable, or it may be bendable, foldable, or rollable. The first protective member 30 may contain polyether block amide (PEBA). However, it is not limited to this and may also contain at least one selected from polyurethane, silicone, pentaerythritol triacrylate (PETA), and copolyester elastomers (COPE).

[0074] The first protective component 30 may also be made of a transparent material. The first protective component 30 may be composed of, for example, glass or plastic. If the first protective component 30 comprises glass, the glass may be an ultra-thin glass (UTG) to a thin-film glass. If the first protective component 30 comprises plastic, the plastic may be transparent polyimide, etc., but is not limited thereto.

[0075] The energy storage modulus (or energy storage elastic modulus) of the first protective component 30 can be greater than 0 MPa (mega pascal) and equal to or less than 9000 MPa at -20°C, or in the range of 25 MPa to 5000 MPa, or in the range of 25 MPa to 2000 MPa, or in the range of 1000 MPa to 2000 MPa. The energy storage modulus of the first protective component 30 can also be in the range of 100 MPa to 9000 MPa at 85°C, or in the range of 100 MPa to 5000 MPa, or in the range of 100 MPa to 2000 MPa, or in the range of 1000 MPa to 2000 MPa.

[0076] When the energy storage modulus of the first protective component 30 meets the above-mentioned range, even if it is folded inward in the first folding region FDA1 and folded outward in the second folding region FDA2, the display device 1 can ensure sufficient flexibility, so that the inward folding and outward folding of the display device 1 can be fully realized smoothly.

[0077] The energy storage modulus of the first protective component 30 can be determined by dynamic viscoelastic analysis (or dynamic mechanical analysis, DMA), but is not limited to this.

[0078] The first protective component 30 may include a second thickness TH2. In other words, the second thickness TH2 may refer to the thickness of the first protective component 30 in the thickness direction (third direction DR3), and the first protective component 30 has a second thickness TH2. The second thickness TH2 is not limited thereto, but may be, for example, in the range of 0.01 μm to 400 μm, or in the range of 0.1 μm to 100 μm, or in the range of 1 μm to 40 μm.

[0079] A first adhesive component PSA1 may be disposed between the first protective component 30 and the anti-reflection component 20. The first protective component 30 and the anti-reflection component 20 can be bonded to each other via the first adhesive component PSA1. The first adhesive component PSA1 may include, but is not limited to, a pressure-sensitive adhesive or a binder. The first adhesive component PSA1 may be optically transparent.

[0080] The first adhesive component PSA1 may include a first thickness TH1. In other words, the first thickness TH1 may refer to the thickness of the first adhesive component PSA1 in the thickness direction (third direction DR3), and the first adhesive component PSA1 has a first thickness TH1. The first thickness TH1 is not limited to this, but may be, for example, in the range of 0.01 μm to 100 μm, or in the range of 0.1 μm to 50 μm, or in the range of 1 μm to 25 μm.

[0081] A second protective member 40 may be disposed above the first protective member 30. The second protective member 40 may work together with the first protective member 30 to protect the display panel 10. The second protective member 40 may be flexible and bendable, or may be bendable, foldable, or rollable.

[0082] The second protective component 40 may be comprised of a polymer film. The second protective component 40 may comprise at least one selected from polyethylene terephthalate (PET), triacetylcellulose (TAC), transparent polyimide, aramid, etc.

[0083] When the display device 1 is folded inward within the first folding region FDA1, the display device 1 can be folded with reference to the first folding axis RX1. When the display device 1 is folded inward within the first folding region FDA1, the first radius of curvature R1 of the second protective member 40 within the first folding region FDA1 can be, for example, in the range of 0.01 mm to 5.0 mm, or in the range of 0.1 mm to 1.0 mm. However, it is not limited to this. In the state where the display device 1 is folded inward within the first folding region FDA1, the first radius of curvature R1 can refer to the radius of curvature formed by the inner surface of the second protective member 40 in the first folding region FDA1. Figure 5 as well as Figure 6 As shown, the first radius of curvature R1 can refer to, for example, the radius of curvature formed on the upper surface of the second protective member 40 disposed on the inside when the display device 1 is folded inside.

[0084] Furthermore, when the display device 1 is folded outward within the second folding region FDA2, the display device 1 can be folded with reference to the second folding axis RX2. When the display device 1 is folded outward within the second folding region FDA2, the second radius of curvature R2 of the second protective member 40 within the second folding region FDA2 can be, for example, in the range of 0.01 mm to 10.0 mm, or in the range of 0.1 mm to 4.0 mm. However, it is not limited to this. The second radius of curvature R2 of the second protective member 40 can be greater than the first radius of curvature R1. In the state where the display device 1 is folded outward within the second folding region FDA2, the second radius of curvature R2 can refer to the radius of curvature formed by the outer surface of the second protective member 40 in the second folding region FDA2. Figure 7 As shown, the second radius of curvature R2 can refer to, for example, the radius of curvature formed on the upper surface of the second protective member 40 disposed on the outside when the display device 1 is folded outward.

[0085] The second protective component 40 may include a fourth thickness TH4. In other words, the fourth thickness TH4 may refer to the thickness of the second protective component 40 in the thickness direction (third direction DR3), and the second protective component 40 has a fourth thickness TH4. The fourth thickness TH4 of the second protective component 40 may be greater than the second thickness TH2 of the first protective component 30, but is not limited thereto. The fourth thickness TH4 is not limited thereto, but may be, for example, in the range of 0.01 μm to 500 μm, or in the range of 0.1 μm to 100 μm, or in the range of 1 μm to 50 μm.

[0086] The second protective component 40 may contain a material whose modulus varies depending on the external impact. When the display device 1 can be folded inwards or outwards, the second protective component 40 can vary its modulus depending on the external impact, thereby ensuring both flexibility and impact resistance.

[0087] Figure 8 This is a graph showing the relationship between the modulus of a second protective component according to one embodiment and external impact. Figure 8 An example of the second protective component 40 is shown. Figure 8 The horizontal axis (X-axis) of the graph shown represents the frequency (Hz) of the second protective component 40, and the vertical axis (Y-axis) represents the energy storage modulus (or energy storage elasticity).

[0088] Reference Figure 8 The energy storage modulus of the second protection component 40 can change with frequency. The energy storage modulus of the second protection component 40 can increase with increasing frequency.

[0089] The curve of the energy storage modulus of the second protection component 40 based on its frequency can have different slopes with 1 Hz as a reference. In other words, compared to the case where the frequency is less than 1 Hz, the slope of the curve of the energy storage modulus of the second protection component 40 based on its frequency is greater when the frequency is greater than 1 Hz. The energy storage modulus of the second protection component 40 increases with increasing frequency, and compared to the case where the frequency is less than 1 Hz, the increase in energy storage modulus based on increasing frequency can be greater when the frequency is greater than 1 Hz.

[0090] When the frequency of the second protective component 40 is equal to or greater than 1 Hz, it can be regarded as an external impact being applied to the second protective component 40. In other words, when an external impact is applied to the second protective component 40, the energy storage modulus of the second protective component 40 can increase, and the energy storage modulus of the second protective component 40 can increase as the magnitude of the external impact increases.

[0091] For example, when the frequency of the second protection component 40 is 1 Hz, the energy storage modulus of the second protection component 40 can be greater than 6 GPa (giga pascal). Furthermore, when the frequency of the second protection component 40 is 30000 Hz, the energy storage modulus of the second protection component 40 can be greater than 8 GPa. Specifically, when the frequency of the second protection component 40 is 1 Hz, the energy storage modulus of the second protection component 40 can be in the range of 6 GPa to 1000 GPa, or in the range of 6 GPa to 100 GPa. Furthermore, when the frequency of the second protection component 40 is 30000 Hz, the energy storage modulus of the second protection component 40 can be in the range of 8 GPa to 1000 GPa, or in the range of 8 GPa to 100 GPa. However, the energy storage modulus of the second protection component 40 is not limited to these values.

[0092] Even if the energy storage modulus increases due to an external impact on the second protective component 40, the energy storage modulus of the second protective component 40 can be restored to the size before the external impact was applied when the impact disappears, but this is not the only possibility.

[0093] The energy storage modulus of the second protective component 40 according to frequency can be determined by dynamic viscoelastic analysis (or dynamic mechanical analysis, DMA), but is not limited thereto.

[0094] When the energy storage modulus of the second protective component 40 increases due to external impact, the second protective component 40 can simultaneously ensure both flexibility and impact resistance to external impact. In other words, when the display device 1 is folded inward in the first folding region FDA1, the second protective component 40 can ensure flexibility in the first folding region FDA with a relatively low modulus. At the same time, when the display device 1 is folded outward in the second folding region FDA2, and an external impact is applied to the corresponding region, the modulus increases, thereby ensuring impact resistance in the corresponding region. Therefore, even when both inward and outward folding are achieved in the display device 1, the second protective component 40 can ensure both flexibility and impact resistance.

[0095] Refer again Figures 3 to 7 A second adhesive component PSA2 may be disposed between the second protective component 40 and the first protective component 30. The second protective component 40 and the first protective component 30 can be bonded to each other via the second adhesive component PSA2. The second adhesive component PSA2 may include, but is not limited to, a pressure-sensitive adhesive or a binder. The second adhesive component PSA2 may contain the same material as the first adhesive component PSA1, but is not limited to it. The second adhesive component PSA2 may be optically transparent.

[0096] The second adhesive component PSA2 may include a third thickness TH3. In other words, the third thickness TH3 may refer to the thickness of the second adhesive component PSA2 in the thickness direction (third direction DR3), and the second adhesive component PSA2 has a third thickness TH3. The third thickness TH3 may be substantially the same as the first thickness TH1 of the first adhesive component PSA1, but is not limited thereto.

[0097] The elastic modulus (elastic coefficient) of the second adhesive component PSA2 can be equal to or less than that of the elastic modulus of the first adhesive component PSA1. However, it is not limited to this, for example, the elastic modulus of the first adhesive component PSA1 can be in the range of greater than 0 kPa and less than 1500 kPa at -20°C, or in the range of greater than 0 kPa and less than 750 kPa, or in the range of greater than 0 kPa and less than 150 kPa. Furthermore, the elastic modulus of the second adhesive component PSA2 can be in the range of greater than 0 kPa and less than 1000 kPa at -20°C, or in the range of greater than 0 kPa and less than 500 kPa, or in the range of greater than 0 kPa and less than 100 kPa.

[0098] When the elastic modulus of the first adhesive component PSA1 and the elastic modulus of the second adhesive component PSA2 are within the aforementioned range, and the elastic modulus of the second adhesive component PSA2 is equal to or less than the elastic modulus of the first adhesive component PSA1, even if the display device 1 is folded inward and outward in different areas, flexibility can be ensured in the inward folded portion while impact resistance can be ensured in the outward folded portion. In other words, by placing the second adhesive component PSA2, which has a relatively small elastic modulus, between the first protective component 30 and the second protective component 40, impact resistance against externally applied impacts can be improved. Furthermore, by placing the first adhesive component PSA1, which has a relatively large elastic modulus, between the anti-reflection component 20 and the first protective component 30, flexibility can be improved.

[0099] Table 1

[0100]

[0101] Table 2

[0102]

[0103]

[0104] Referring to Tables 1 and 2, which show the folding strain of the first protective component 30 and the second protective component 40 measured during inward folding at -20°C and 85°C, respectively, based on the elastic modulus of the first adhesive component PSA1 and the second adhesive component PSA2. The second protective component 40 has a thickness of 50 μm and contains optically transparent polyimide. The first protective component 30 has a thickness of 75 μm and contains pentaerythrito triacrylate (PETA).

[0105] In Table 1, the elastic modulus of the first adhesive component PSA1 and the elastic modulus of the second adhesive component PSA2 were measured at -20°C using a universal testing machine (UTM). In Table 2, the elastic modulus of the first adhesive component PSA1 and the elastic modulus of the second adhesive component PSA2 were measured at 85°C using a universal testing machine (UTM).

[0106] When the folding strain (%) of the second protective component 40 is equal to or less than 2.3% and the folding strain (%) of the first protective component 30 is equal to or less than 7.0%, the second protective component 40 can maintain its folding characteristics even with repeated folding and can maintain the structural stability of the display device 1. In other words, when the folding strain of the second protective component 40 and the folding strain of the first protective component 30 are within the above-mentioned ranges, even if the display device 1 is repeatedly folded, the folding performance of the first protective component 30 and the second protective component 40 can be suppressed or prevented from deteriorating.

[0107] Furthermore, when the folding strain of the second protective member 40 and the folding strain of the first protective member 30 are within the aforementioned range, buckling defects can be suppressed or prevented between adjacent different laminated structures.

[0108] In Examples 1-10, the elastic modulus of the second adhesive component PSA2 is less than 150 kPa, the elastic modulus of the first adhesive component PSA1 is less than 150 kPa and greater than 100 kPa, and the elastic modulus of the second adhesive component PSA2 is equal to or less than the elastic modulus of the first adhesive component PSA1. In Comparative Examples 1-8, i) the elastic modulus of the second adhesive component PSA2 is less than 150 kPa, the elastic modulus of the first adhesive component PSA1 is less than 150 kPa and greater than 100 kPa, and the elastic modulus of the second adhesive component PSA2 is greater than the elastic modulus of the first adhesive component PSA1; or, ii) the elastic modulus of the second adhesive component PSA2 is less than 150 kPa, the elastic modulus of the first adhesive component PSA1 is less than 100 kPa, and the elastic modulus of the second adhesive component PSA2 is greater than the elastic modulus of the first adhesive component PSA1.

[0109] Comparing the embodiments and comparative examples, if the elastic modulus of the second adhesive component PSA2 is less than 150 kPa and the elastic modulus of the first adhesive component PSA1 is greater than 100 kPa and less than 150 kPa, then when the elastic modulus of the second adhesive component PSA2 is equal to or less than the elastic modulus of the first adhesive component PSA1, the folding strain of the second protective component 40 and the folding strain of the first protective component 30 are reduced compared to the case where the elastic modulus of the second adhesive component PSA2 is greater than that of the first adhesive component PSA1. Therefore, the folding performance of the first protective component 30 and the second protective component 40 can be maintained more smoothly. Furthermore, with the reduction in the folding strain of the second protective component 40 and the first protective component 30, buckling defects can be more effectively suppressed or prevented between adjacent multilayer structures.

[0110] Furthermore, when comparing the various embodiments, when the elastic modulus of the second adhesive member PSA2 is less than that of the first adhesive member PSA1, the folding strain of the second protective member 40 and the folding strain of the first protective member 30 are reduced compared to the case where the elastic modulus of the second adhesive member PSA2 is the same as that of the first adhesive member PSA1.

[0111] Although not shown, a hard coating may also be disposed above the second protective member 40. The hard coating can protect the surface of the second protective member 40. Specifically, the hard coating can perform at least one of the functions of the second protective member 40: scattering prevention, impact absorption, scratch prevention, fingerprint prevention, and glare prevention.

[0112] A polymer film layer FL can be disposed below the display panel 10. The polymer film layer FL may contain, for example, polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polysulfone (PSF), polymethyl methacrylate (PMMA), cellulose triacetate (TAC), cyclic olefin polymer (COP), etc. The polymer film layer FL may include a functional layer on at least one side. The functional layer may include, for example, a light-absorbing layer. The light-absorbing layer may contain a light-absorbing substance such as a black pigment or dye. The light-absorbing layer may be formed on the polymer film using black ink by coating or printing.

[0113] A buffer layer CU can be disposed below the polymer film layer FL. The buffer layer CU can increase the durability against impacts that may be applied to the thickness direction (third direction DR3) of the display device 1, and play a role in mitigating the impact of a drop when the display device 1 is dropped. The buffer layer CU may contain polyurethane, etc.

[0114] A heat dissipation component HP can be disposed below the buffer layer CU. The heat dissipation component HP serves to diffuse heat generated from the display panel 10 or other components of the display device 1. The heat dissipation component HP may include a metal plate. The metal plate may contain a metal with excellent thermal conductivity, such as copper or silver. The heat dissipation component HP may also include heat sinks containing graphite or carbon nanotubes.

[0115] In order to facilitate the folding of the display device 1, a portion of the display device 1 can be separated based on the folding region FDA. For example, the heat dissipation component HP, which constitutes the bottommost layer of the display device 1 and has low extensibility, can be separated based on the first folding region FDA1 and the second folding region FDA2.

[0116] In the case of the buffer layer CU or the polymer film layer FL, the folded region FDA can be separated as a reference, but if they have sufficient extensibility, they can also be integrally connected with the folded region FDA and the non-folded region NFA independently.

[0117] If the display device 1 is folded inward with reference to the first folding area FDA1, then as Figure 5 As shown, the second non-folding region NFA2 can overlap with the first non-folding region NFA1 in the thickness direction. Furthermore, if the display device 1 is folded outwards with the second folding region FDA2 as a reference, then as... Figure 7 As shown, the second non-folded region NFA2 can overlap with the third non-folded region NFA3 in the thickness direction.

[0118] Unlike the separate heat dissipation component HP, the display panel 10, polymer film layer FL, buffer layer CU, anti-reflection component 20, first protective component 30, and second protective component 40, which are connected independently of the folding region FDA, can be bent along the width direction of the first folding region FDA1 and the second folding region FDA2 to form a curve in cross-section.

[0119] The following is for reference Figure 9 The specific stacked structure of the display panel 10 according to one embodiment will be described.

[0120] Figure 9 This is a cross-sectional view of a display panel according to one embodiment.

[0121] Reference Figure 9 The display panel 10 according to one embodiment may include a plurality of pixels, each pixel including at least one thin-film transistor TR. The display panel 10 may include a substrate SUB, a barrier layer 110, a buffer layer 120, a semiconductor layer 130, a first insulating layer IL1, a first gate conductive layer 140, a second insulating layer IL2, a second gate conductive layer 150, a third insulating layer IL3, a data conductive layer 160, a via layer VIA, an anode electrode ANO, a pixel defining film PDL defining an opening OP exposing the anode electrode ANO, spacers SC disposed on the pixel defining film PDL, a light-emitting layer EML at least partially disposed within the opening OP of the pixel defining film PDL, a cathode electrode CAT disposed on the light-emitting layer EML and the pixel defining film PDL, and an encapsulation layer ENL disposed on the cathode electrode CAT. Each of the above layers may be composed of a single film, or may be composed of a stacked film comprising multiple films. Other layers may also be disposed between the layers.

[0122] The substrate SUB supports the layers disposed thereon. The substrate SUB can be made of an insulating material such as a polymer resin. Examples of such polymer materials include polyethersulfone (PES), polyacrylate (PA), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose acetate propionate (CAP), or combinations thereof. However, it is not limited to these, and the substrate SUB can be a transparent plate or a transparent film.

[0123] The substrate SUB can be a flexible substrate capable of bending, folding, rolling, etc. Examples of materials constituting a flexible substrate include polyimide (PI), but it is not limited to this.

[0124] A barrier layer 110 is disposed on the substrate SUB. The barrier layer 110 prevents the diffusion of impurity ions, prevents the penetration of moisture or external air, and performs a surface planarization function. The barrier layer 110 may contain silicon oxide (SiO2). x ), silicon nitride (SiN) x ) or silicon oxynitride (SiO) x N y At least one of the following. However, it is not limited to this, the barrier layer 110 may also be omitted depending on the type of substrate SUB or process conditions.

[0125] A buffer layer 120 is disposed on the barrier layer 110. The buffer layer 120 prevents the diffusion of impurity ions, prevents the penetration of moisture or external air, and performs a surface planarization function. The buffer layer 120 may contain silicon nitride (SiN). x ), silicon dioxide (SiO) x ) or silicon oxynitride (SiO) x N y The buffer layer 120 may also be omitted depending on the type of substrate SUB or process conditions.

[0126] A semiconductor layer 130 is disposed on the buffer layer 120. The semiconductor layer 130 forms the channel of the thin-film transistor TR of the pixel. The semiconductor layer 130 may contain polycrystalline silicon. However, it is not limited thereto, and the semiconductor layer 130 may also contain at least one of monocrystalline silicon, low-temperature polycrystalline silicon, amorphous silicon, and oxide semiconductor. Alternatively, the semiconductor layer 130 may also contain an oxide semiconductor. For example, the oxide semiconductor may include at least one of indium gallium zinc oxide (IGZO), zinc tin oxide (ZTO), and indium tin oxide (IZO).

[0127] A first insulating layer IL1 is disposed on the semiconductor layer 130. The first insulating layer IL1 may be a first gate insulating film with gate insulation function. The first insulating layer IL1 may comprise at least one of silicon compound and metal oxide.

[0128] A first gate conductive layer 140 is disposed on the first insulating layer IL1. The first gate conductive layer 140 may include the gate electrode GAT of the thin film transistor TR of the pixel and the scan line connected thereto, as well as the first electrode CE1 of the holding capacitor.

[0129] The first gate conductive layer 140 may contain one or more metals selected from molybdenum (Mo), aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W), and copper (Cu).

[0130] A second insulating layer IL2 may be disposed on the first gate conductive layer 140. The second insulating layer IL2 may be an interlayer insulating film or a second gate insulating film. The second insulating layer IL2 may contain inorganic insulating materials such as silicon oxide, silicon nitride, silicon oxynitride, hafnium oxide, aluminum oxide, titanium oxide, tantalum oxide, and zinc oxide.

[0131] A second gate conductive layer 150 is disposed on the second insulating layer IL2. The second gate conductive layer 150 may include the second electrode CE2 of the holding capacitor. The second gate conductive layer 150 may contain one or more metals selected from molybdenum (Mo), aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W), and copper (Cu). The second gate conductive layer 150 may be made of the same material as the first gate conductive layer 140, but is not limited thereto.

[0132] A third insulating layer IL3 is disposed on the second gate conductive layer 150. The third insulating layer IL3 may be an interlayer insulating film. The third insulating layer IL3 may contain inorganic insulating materials such as silicon oxide, silicon nitride, silicon oxynitride, hafnium oxide, aluminum oxide, titanium oxide, tantalum oxide, and zinc oxide.

[0133] A data conductive layer 160 is disposed on the third insulating layer IL3. The data conductive layer 160 may include a first electrode SD1 and a second electrode SD2 of a thin-film transistor TR of a pixel of the display panel 10, as well as a first power supply line ELVDDE. The first electrode SD1 and the second electrode SD2 of the thin-film transistor TR can be electrically connected to the source region and the drain region of the semiconductor layer 130 through contact holes penetrating the third insulating layer IL3, the second insulating layer IL2, and the first insulating layer IL1. The first power supply voltage electrode ELVDDE can be electrically connected to the second electrode CE2 of the holding capacitor through a contact hole penetrating the third insulating layer IL3.

[0134] The data conductive layer 160 may contain one or more metals selected from aluminum (Al), molybdenum (Mo), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W), and copper (Cu). The data conductive layer 160 may be a single film or a multilayer film. For example, the data conductive layer 160 may be formed as a stacked structure such as Ti / Al / Ti, Mo / Al / Mo, Mo / AlGe / Mo, or Ti / Cu.

[0135] A via layer (or planarization layer) is disposed on the data conductive layer 160. The via layer VIA covers the data conductive layer 160. The via layer VIA may contain an organic insulating material. When the via layer VIA contains an organic material, the top can be generally flat regardless of the underlying steps.

[0136] An anode electrode ANO is disposed on the via layer VIA. The anode electrode ANO can be disposed on one side of the via layer VIA. The anode electrode ANO can be a pixel electrode disposed in each pixel. The anode electrode ANO can be connected to the second electrode SD2 of the thin-film transistor TR through a contact hole CNT penetrating the via layer VIA. The anode electrode ANO can at least partially overlap with the light-emitting area EMA of the pixel.

[0137] While not limited to these, the anode electrode (ANO) can have a multilayer film structure consisting of layers of materials with high work function, such as indium-tin oxide (ITO), indium-zinc oxide (IZO), zinc oxide (ZnO), and indium oxide (In₂O₃), and layers of reflective materials such as silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), lead (Pb), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), or mixtures thereof. The layers with high work function can be positioned above the reflective material layers and closer to the light-emitting layer (EML). The anode electrode (ANO) can have multilayer structures such as ITO / Mg, ITO / MgF, ITO / Ag, and ITO / Ag / ITO, but is not limited to these.

[0138] A pixel defining film (PDL) can be disposed on the anode electrode (ANO). The PDL can be disposed on the anode electrode (ANO) and includes an opening (OP) exposing the anode electrode (ANO). The opening (OP) can be defined by the pixel defining film (PDL) and extends through the pixel defining film (PDL) in the thickness direction. The pixel defining film (PDL) and its opening (OP) can be used to divide the light-emitting region (EMA) and the non-light-emitting region (NEM). The pixel defining film (PDL) can contain an organic insulating material. However, it is not limited to this; the pixel defining film (PDL) can also contain an inorganic material.

[0139] Spacers SC can be disposed on the pixel defining film PDL. The spacers SC can protrude from at least a portion of the pixel defining film PDL toward one side (upper side) in the thickness direction. The spacers SC can serve to maintain a distance from structures disposed above them. However, for example, the spacers SC can prevent defects such as scratches from occurring on the display panel 10 through the FMM (fine metal mask). Like the pixel defining film PDL, the spacers SC can be composed of an organic insulating material. However, the spacers SC can be formed together with the pixel defining film PDL using the same process.

[0140] An emissive layer (EML) is disposed on the anode electrode (ANO) exposed by the pixel defining film (PDL). The emissive layer (EML) may contain an organic material layer. The organic material layer of the emissive layer (EML) may include an organic emissive layer, as well as a hole injection / transport layer and / or an electron injection / transport layer.

[0141] A cathode electrode (CAT) can be configured on the emissive layer (EML). The cathode electrode (CAT) can be a common electrode configured without pixel differentiation. The anode electrode (ANO), the emissive layer (EML), and the cathode electrode (CAT) can each constitute an organic light-emitting element.

[0142] The cathode electrode CAT may comprise a layer of a low work function material such as Li, Ca, LiF / Ca, LiF / Al, Al, Mg, Ag, Pt, Pd, Ni, Au, Nd, Ir, Cr, BaF, Ba, or compounds or mixtures thereof (e.g., mixtures of Ag and Mg). The cathode electrode CAT may also include a transparent metal oxide layer disposed on the low work function material layer.

[0143] An encapsulation layer ENL, comprising a first encapsulation film EN1, a second encapsulation film EN2, and a third encapsulation film EN3, is disposed above the cathode electrode CAT. At the ends of the encapsulation layer ENL, the first encapsulation film EN1 and the third encapsulation film EN3 can contact each other. The second encapsulation film EN2 can be sealed by the first encapsulation film EN1 and the third encapsulation film EN3.

[0144] The first encapsulation film EN1 and the third encapsulation film EN3 may each contain inorganic materials. However, they are not limited to this, but the inorganic materials may include, for example, silicon nitride, silicon oxide, or silicon oxynitride. The second encapsulation film EN2 may contain organic materials. However, they are not limited to this, but the organic materials may include, for example, organic insulating materials.

[0145] The following description focuses on other embodiments. In these embodiments, descriptions of structures identical to those already described will be omitted or simplified, and the focus will be on the differences.

[0146] Figure 10 A cross-section of a display device according to another embodiment is shown. Figure 1 part.

[0147] Reference Figure 10 ,and Figure 4 The difference in the embodiments is that, according to this embodiment, the second thickness TH2_1 of the first protective member 30_1 of the display device 1_1 is greater than the fourth thickness TH4 of the second protective member 40. Although not limited thereto, the second thickness TH2_1 of the first protective member 30_1 can, for example, be in the range of 0.01 μm to 750 μm, or in the range of 0.1 μm to 200 μm, or in the range of 1 μm to 75 μm. Alternatively, the second thickness TH2_1 of the first protective member 30_1 can, for example, be in the range of 0.01 μm to 1000 μm, or in the range of 0.1 μm to 300 μm, or in the range of 1 μm to 100 μm.

[0148] Table 3

[0149] Thickness (μm) of the second protective component 50 50 50 Thickness (μm) of the second adhesive component 25 25 25 Thickness (μm) of the first protective component 40 75 100 Thickness (μm) of the first adhesive component 25 25 25 The height of the bright spot (cm) 2 5 6

[0150] Referring to Table 3, which shows the results of measuring the height of the bright spot based on the thicknesses of the first adhesive component PSA1, the first protective component 30_1, the second adhesive component PSA2, and the second protective component 40. Here, the height of the bright spot can refer to the height of the bright spot defect in the display device when an object is dropped from above the display device. Therefore, it can be understood that the greater the height of the bright spot, the greater the impact resistance.

[0151] Comparative Example 9 can be compared with... Figure 4 The display device 1 of the embodiment (refer to) Figure 1 Essentially the same, the first protective component 30 (refer to...) Figure 4 The thickness of the second thickness TH2 (refer to) Figure 4 The thickness of the first protective component 30_1 (the second thickness TH2_1) is less than the thickness of the second protective component 40 (the fourth thickness TH4). In Embodiments 11 and 12, the thickness of the first protective component 30_1 (the second thickness TH2_1) is greater than the thickness of the second protective component 40 (the fourth thickness TH4).

[0152] Comparing Comparative Example 9 with Examples 11 and 12, when the thickness of the first protective member 30_1 (second thickness TH2_1) is greater than the thickness of the second protective member 40 (fourth thickness TH4), compared to the first protective member 30 (refer to...), Figure 4 The thickness of the second thickness TH2 (refer to) Figure 4 When the thickness of the first protective component 30_1 is less than the thickness of the second protective component 40 (fourth thickness TH4), the height of the bright spot is large. That is, when the thickness of the first protective component 30_1 (second thickness TH2_1) is greater than the thickness of the second protective component 40 (fourth thickness TH4), compared to the first protective component 30 (refer to...), the height of the bright spot is large. Figure 4 The thickness of the second thickness TH2 (refer to) Figure 4 If the thickness is less than that of the second protective component 40 (the fourth thickness TH4), the impact resistance can be further improved.

[0153] Furthermore, comparing Embodiment 11 and Embodiment 12, when the thickness of the first protective component 30_1 (second thickness TH2_1) is greater than the thickness of the second protective component 40 (fourth thickness TH4), the greater the thickness of the first protective component 30_1 (second thickness TH2_1), the greater the height of the bright spot. That is, when the thickness of the first protective component 30_1 (second thickness TH2_1) is greater than the thickness of the second protective component 40 (fourth thickness TH4), increasing the thickness of the first protective component 30_1 (second thickness TH2_1) improves impact resistance.

[0154] Even under these conditions, the second protective component 40 can increase its energy storage modulus in response to external impacts, thereby ensuring both flexibility and impact resistance of the display device 1_1. Furthermore, the elastic modulus of the second adhesive component PSA2 is equal to or less than that of the first adhesive component PSA1, thus suppressing or preventing a decrease in folding performance. Moreover, as the thickness of the first protective component 30_1 (second thickness TH2_1) is greater than the thickness of the second protective component 40 (fourth thickness TH4), impact resistance is improved.

[0155] Figure 11 A cross-section of a display device according to yet another embodiment is shown. Figure 1 part.

[0156] Reference Figure 11 ,and Figure 10 The difference in the embodiments is that, according to this embodiment, the first thickness TH1_2 of the first adhesive member PSA1_2 of the display device 1_2 is greater than the third thickness TH3 of the second adhesive member PSA2. However, it is not limited to this, but the first thickness TH1_2 of the first adhesive member PSA1_2 can be, for example, in the range of 0.01 μm to 500 μm, or in the range of 0.1 μm to 150 μm, or in the range of 1 μm to 50 μm.

[0157] Table 4

[0158] Thickness (μm) of the second protective component 50 50 Thickness (μm) of the second adhesive component 25 25 Thickness (μm) of the first protective component 75 75 Thickness (μm) of the first adhesive component 25 35 The height of the bright spot (cm) 5 8

[0159] Referring to Table 4, which shows the results of measuring the height of the bright spot based on the thickness of the first adhesive component PSA1_2, the first protective component 30_1, the second adhesive component PSA2, and the second protective component 40.

[0160] Comparative Example 10 can be compared with... Figure 10 The display device 1_1 of the embodiment (refer to) Figure 10 The thickness of the first adhesive component PSA1 is essentially the same (the first thickness TH1 is referenced). Figure 10 )) equals the second adhesive component PSA2 (refer to Figure 10The thickness of the first adhesive component PSA1_2 (the first thickness TH1_2) is greater than the thickness of the second adhesive component PSA2 (the third thickness TH3). In Example 13, the thickness of the first adhesive component PSA1_2 (the first thickness TH1_2) is greater than the thickness of the second adhesive component PSA2 (the third thickness TH3).

[0161] Comparing Comparative Example 10 with Example 13, when the thickness of the first adhesive component PSA1_2 (first thickness TH1_2) is greater than the thickness of the second adhesive component PSA2 (third thickness TH3), compared to the first adhesive component PSA1 (refer to Example 13), Figure 10 The thickness of (first thickness TH1 (reference)) Figure 10 When the thickness of the first adhesive component PSA1_2 (third thickness TH3) is the same as that of the second adhesive component PSA2, the height of the bright spot is large. That is, when the thickness of the first adhesive component PSA1_2 (first thickness TH1_2) is greater than the thickness of the second adhesive component PSA2 (third thickness TH3), compared to the first adhesive component PSA1 (refer to...), the height of the bright spot is large. Figure 10 The thickness of (first thickness TH1 (reference)) Figure 10 When the thickness of the second adhesive component PSA2 (the third thickness TH3) is equal to that of the third adhesive component, impact resistance can be improved.

[0162] Even under these conditions, the second protective component 40 can increase its energy storage modulus in response to external impacts, thereby enabling the display device 1_2 to jointly ensure both flexibility and impact resistance. Furthermore, the elastic modulus of the second adhesive component PSA2 is equal to or less than that of the first adhesive component PSA1_2, thereby suppressing or preventing a decrease in folding performance. Additionally, as the thickness of the first adhesive component PSA1_2 (first thickness TH1_2) is greater than the thickness of the second adhesive component PSA2 (third thickness TH3), impact resistance is improved.

[0163] Figure 12 This is a perspective view showing the unfolded state of the display device according to yet another embodiment. Figure 13 It shows the basis Figure 12 A perspective view of the folded state inside the display device of an embodiment. Figure 14 It shows the basis Figure 12 A perspective view of the display device in an outward-folded state according to an embodiment.

[0164] Reference Figures 12 to 14 According to the display device 1_3 of this embodiment and Figure 1The difference in the exemplary embodiment is that it is folded inward and outward within the same folding area FDA. In other words, the display device 1_3 may include a folding area FDA and a non-folding area NFA, and the display device 1_3 may include a first folding area FDA1, a first non-folding area FDA1 and a second non-folding area NFA2 respectively disposed on one side of the second direction DR2 of the first folding area FDA1 and the other side. In this case, the first folding area FDA1 may be as follows: Figure 13 As shown, it folds inward and can be as follows: Figure 14 The external fold is shown.

[0165] Even under these conditions, the second protective component 40 can increase its energy storage modulus in response to external impacts, thus ensuring both flexibility and impact resistance for the display devices 1 and 3. Furthermore, the elastic modulus of the second adhesive component PSA2 is equal to or less than that of the first adhesive component PSA1, thereby suppressing or preventing a decrease in folding performance. Additionally, display devices with various folding methods can be provided according to the user's needs.

[0166] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, it will be understood that those skilled in the art to which this invention pertains may implement it in other specific forms without altering its technical concept or essential features. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not limiting.

Claims

1. A display device comprising a folding region for realizing inward folding and outward folding, wherein, The display device includes: Display panel; The first protective component is disposed on the display panel; The second protective component is disposed on the first protective component; A first adhesive component is disposed between the display panel and the first protective component; and The second adhesive component is disposed between the first protective component and the second protective component, and has a modulus smaller than that of the first adhesive component. The first protective component is disposed between the display panel and the second protective component. The modulus of the first adhesive component and the modulus of the second adhesive component are elastic moduli, and are determined by dynamic mechanical analysis.

2. The display device according to claim 1, wherein, The modulus of the first adhesive component is in the range of greater than 0 kPa and less than 150 kPa at -20°C, and the modulus of the second adhesive component is in the range of greater than 0 kPa and less than 150 kPa at -20°C.

3. The display device according to claim 1, wherein, The first protective component has a first thickness, and the second protective component has a second thickness greater than the first thickness.

4. The display device according to claim 1, wherein, The first adhesive component has a third thickness, and the second adhesive component has a fourth thickness greater than the third thickness.

5. The display device according to claim 1, wherein, The folded region includes a first folded region and a second folded region that are separate from each other and extend in a first direction. The display device folds inward with the first folding area as a reference and folds outward with the second folding area as a reference.

6. The display device according to claim 5, wherein, The display device further includes: a first non-foldable region disposed on one side of the first foldable region in a second direction intersecting the first direction; a second non-foldable region disposed between the first foldable region and the second foldable region; and a third non-foldable region disposed on the other side of the second direction of the second foldable region.

7. The display device according to claim 6, wherein, The display device further includes a display area for displaying images and a non-display area disposed outside the display area. The display area and the non-display area are configured to extend over the first folded area, the second folded area, the first non-folded area, the second non-folded area, and the third non-folded area.

8. The display device according to claim 1, wherein, The energy storage modulus of the second protection component increases with increasing frequency.

9. The display device according to claim 8, wherein, The increase in the energy storage modulus of the second protection component with increasing frequency is greater when the frequency of the second protection component is greater than that when the frequency of the second protection component is less than 1 Hz.

10. The display device according to claim 9, wherein, The energy storage modulus of the second protective component is in the range of 6 GPa to 1000 GPa at a frequency of 1 Hz, and in the range of 8 GPa to 1000 GPa at a frequency of 30000 Hz. The energy storage modulus of the second protective component is determined by dynamic mechanical analysis.

11. The display device according to claim 8, wherein, The second protective component comprises at least one selected from polyethylene terephthalate, cellulose triacetate, transparent polyimide, and aramid.

12. The display device according to claim 1, wherein, The energy storage modulus of the first protective component is in the range of 1000MPa to 2000MPa at -20℃ and in the range of 100MPa to 2000MPa at 85℃.

13. A display device comprising a first folding region and a second folding region that are separated from each other and extend in a first direction, wherein, The display device includes: Display panel; The first protective component is disposed on the display panel; The second protection component is disposed on the first protection component, and its energy storage modulus increases with increasing frequency; A first adhesive component is disposed between the display panel and the first protective component; and A second adhesive component is disposed between the first protective component and the second protective component. The display device folds inward based on the first folding area and folds outward based on the second folding area. The modulus of the second adhesive component is less than that of the first adhesive component. The first protective component is disposed between the display panel and the second protective component. The increase in the energy storage modulus of the second protection component with increasing frequency is greater when the frequency of the second protection component is greater than that when the frequency of the second protection component is less than 1 Hz.

14. The display device according to claim 13, wherein, The energy storage modulus of the second protective component is in the range of 6 GPa to 1000 GPa at a frequency of 1 Hz, and in the range of 8 GPa to 1000 GPa at a frequency of 30000 Hz. The energy storage modulus of the second protective component is determined by dynamic mechanical analysis.

15. The display device according to claim 13, wherein, The second protective component comprises at least one selected from polyethylene terephthalate, cellulose triacetate, transparent polyimide, and aramid.

16. The display device according to claim 13, wherein, The elastic modulus of the second adhesive component is equal to or less than the elastic modulus of the first adhesive component.

17. The display device according to claim 13, wherein, The energy storage modulus of the first protective component is in the range of 1000MPa to 2000MPa at -20℃ and in the range of 100MPa to 2000MPa at 85℃.

18. A display device comprising a first folding region and a second folding region that are separated from each other and extend in a first direction, wherein, The display device includes: Display panel; The first protective component is disposed on the display panel; The second protective component is disposed on the first protective component; A first adhesive component is disposed between the display panel and the first protective component; and A second adhesive component is disposed between the first protective component and the second protective component. The display device folds inward based on the first folding area and folds outward based on the second folding area. The energy storage modulus of the first protective component is in the range of 1000MPa to 2000MPa at -20℃ and in the range of 100MPa to 2000MPa at 85℃. The modulus of the second adhesive component is less than that of the first adhesive component. The first protective component is disposed between the display panel and the second protective component.

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