Foldable display device

Abstract

A foldable display device is provided. The foldable display device includes a flexible display module including a first area, a second area, and a foldable area between the first area and the second area; a first support portion disposed under the flexible display module and including a plurality of first carbon fibers extending in a first direction; and a second support portion disposed under the first support portion and including a plurality of second carbon fibers extending in a second direction.

Description

Technical Field

[0001] This invention relates to a foldable display device. More specifically, this invention relates to a foldable display device including a support portion. Background Technology

[0002] A display device is an output device used to present information in a visual form. For example, a display device can display images to provide information to a user. In contrast to traditional flat panel displays, flexible display devices are electronic visual displays that are inherently flexible. For example, a flexible display device may include a bent portion and display images within the bent portion.

[0003] Recently, foldable display devices have been developed. Foldable display devices can be repeatedly folded or unfolded. A foldable display device may include a flexible display module and a support portion disposed on the bottom surface of the flexible display module. The support portion may have relatively high rigidity to prevent the flexible display module from deforming due to user touch or similar actions.

[0004] Metal is typically used to form the support structure. However, when the support structure includes metal, the weight of the foldable display device can increase. Furthermore, when the foldable display device is repeatedly folded and unfolded, creases may form on the support structure due to its metallic composition. Summary of the Invention

[0005] Embodiments of the present invention provide a foldable display device including a support portion.

[0006] A foldable display device according to an embodiment of the present invention may include: a flexible display module including a first region, a second region, and a foldable region between the first region and the second region; a first support portion disposed below the flexible display module and including a plurality of first carbon fibers extending in a first direction; and a second support portion disposed below the first support portion and including a plurality of second carbon fibers extending in a second direction.

[0007] The first direction and the second direction can be different from each other.

[0008] The flexible display module is foldable around a folding axis in the foldable region, and the first and second directions are symmetrical to each other based on the folding axis.

[0009] The flexible display module is foldable around a folding axis in the foldable region, and the first and second directions can be perpendicular to each other.

[0010] The first direction can be parallel to the folding axis.

[0011] The first direction can be perpendicular to the folding axis.

[0012] The foldable display device may also include a third support portion disposed below the second support portion and including a plurality of third carbon fibers extending upward from the third support portion.

[0013] The third direction can be the same as the first direction.

[0014] The flexible display module is foldable around a folding axis in the foldable region, and the first and second directions are symmetrical about each other based on the folding axis and are perpendicular to each other.

[0015] Each of the first support portion and the second support portion may include carbon fiber reinforced plastic (CFRP).

[0016] Each of the first support portion and the second support portion may also include multiple grooves in the foldable area.

[0017] The foldable display device may further include: a first plate disposed below the second support and overlapping the first region; and a second plate disposed below the second support, overlapping the second region and spaced apart from the first plate.

[0018] Each of the first and second plates can partially overlap with the foldable area.

[0019] Each of the first and second plates may include CFRP.

[0020] A foldable display device according to an embodiment of the present invention may include: a flexible display module including a first region, a second region, and a foldable region between the first region and the second region; a first support portion disposed below the flexible display module and including a plurality of first carbon fibers extending in a first direction; a second support portion disposed below the first support portion; and a third support portion disposed below the second support portion and including a plurality of second carbon fibers extending in a second direction.

[0021] The first direction can be the same as the second direction.

[0022] The first direction may be different from the second direction.

[0023] The flexible display module is foldable around a folding axis in the foldable region, and the first and second directions are symmetrical to each other based on the folding axis.

[0024] The first and second directions can be perpendicular to each other.

[0025] The second support may not include carbon fiber.

[0026] A foldable display device according to an embodiment of the present invention may include: a flexible display module including a first region, a second region and a foldable region between the first region and the second region; a first support portion disposed below the flexible display module; and a second support portion disposed below the first support portion, wherein at least one of the first support portion and the second support portion includes carbon fiber.

[0027] At least one of the first support portion and the second support portion may include a groove in the foldable region.

[0028] The foldable display device may further include a first plate disposed below a second support in a first region and a second plate disposed below a second support in a second region, wherein the first plate and the second plate are separated from each other in the foldable region.

[0029] According to embodiments of the present invention, the foldable display device may include a support portion comprising a plurality of carbon fibers. Accordingly, the weight of the foldable display device can be reduced, and creases generated when the foldable display device is folded or unfolded can be reduced. Attached Figure Description

[0030] Figure 1 This is a perspective view showing the unfolded state of a flexible display module included in a foldable display device according to an embodiment of the present invention.

[0031] Figure 2 It is shown Figure 1 A cross-sectional view of the flexible display module in its folded state.

[0032] Figure 3 This is a cross-sectional view showing a foldable display device according to an embodiment of the present invention.

[0033] Figure 4 It is shown Figure 3 Enlarged cross-sectional view of area "A".

[0034] Figure 5 It is shown that it includes Figure 3 A perspective view of the support portion in a foldable display device.

[0035] Figure 6 This is a plan view illustrating a foldable display device according to an embodiment of the present invention.

[0036] Figure 7 It is shown that it includes Figure 6 A perspective view of the support portion in a foldable display device.

[0037] Figure 8 This is a plan view illustrating a foldable display device according to an embodiment of the present invention.

[0038] Figure 9 It is shown that it includes Figure 8 A perspective view of the support portion in a foldable display device.

[0039] Figure 10 This is a plan view illustrating a foldable display device according to an embodiment of the present invention.

[0040] Figure 11 It is shown that it includes Figure 10 A perspective view of the support portion in a foldable display device.

[0041] Figure 12 This is a cross-sectional view showing a foldable display device according to an embodiment of the present invention.

[0042] Figure 13 It is shown that it includes Figure 12 A perspective view of the support portion in a foldable display device.

[0043] Figure 14 , Figure 15 and Figure 16 This is a cross-sectional view showing a foldable display device according to an embodiment of the present invention.

[0044] Figure 17 This is a cross-sectional view showing a foldable display device according to an embodiment of the present invention.

[0045] Figure 18 and Figure 19 It is shown that it includes Figure 17 A perspective view of the support portion in a foldable display device. Detailed Implementation

[0046] In the following description, a foldable display device according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings. The same or similar reference numerals may be used for the same elements in the drawings.

[0047] Figure 1 This is a perspective view showing the unfolded state of a flexible display module included in a foldable display device according to an embodiment of the present invention. Figure 2 It is shown Figure 1 A cross-sectional view of the flexible display module in its folded state.

[0048] Figure 1 and Figure 2 A flexible display module 100 included in a foldable display device according to an embodiment of the present invention is shown.

[0049] The flexible display module 100 may include a first surface 101 and a second surface 102 opposite to the first surface 101. The first surface 101 may be the surface in the flexible display module 100 on which an image is displayed. The second surface 102 may be the surface in the flexible display module 100 on which no image is displayed. In embodiments of the invention, the image may also be displayed on the second surface 102. For example, the image may be displayed on a portion of the second surface 102. Alternatively, the image may be displayed over the entire area of ​​the second surface 102.

[0050] The flexible display module 100 may have a stacked structure. For example, the flexible display module 100 may include multiple layers with different functions. Each of the multiple layers may have flexible characteristics, so that the flexible display module 100 can have flexible characteristics.

[0051] The flexible display module 100 may include a first region NFA1, a second region NFA2 spaced apart from the first region NFA1, and a foldable region FA located between the first region NFA1 and the second region NFA2.

[0052] The flexible display module 100 may not be folded in the first region NFA1 and the second region NFA2. In other words, the first region NFA1 and the second region NFA2 may not have flexible characteristics. The flexible display module 100 may have flat surfaces in the first region NFA1 and the second region NFA2.

[0053] The flexible display module 100 can be folded or unfolded within a foldable region FA. For example, the flexible display module 100 may have a folding axis Faxis on a first surface 101 within the foldable region FA. The flexible display module 100 can be folded within the foldable region FA based on the folding axis Faxis (e.g., Figure 2 (in its folded state) or unfolded state (e.g., Figure 1 (The unfolded state). For example, Figure 2 As shown, when the flexible display module 100 is folded, the first region NFA1 and the second region NFA2 can overlap each other.

[0054] Figure 3 This is a cross-sectional view showing a foldable display device according to an embodiment of the present invention. Figure 4 It is shown Figure 3 Enlarged cross-sectional view of area "A". Figure 5 It is shown that it includes Figure 3 A perspective view of the support portion in a foldable display device.

[0055] Figure 3 The flexible display module 100 shown can be used with the section shown along line I-I'. Figure 1The cross-sectional view corresponds to that of the flexible display module 100. The flexible display module 100 may include a window protective layer 10, a window 20, a polarizing layer 30, a sensing layer 40, a display panel 50, a protective film 60, and a buffer member 70. Since the flexible display module 100 can be folded or unfolded, each of the window protective layer 10, window 20, polarizing layer 30, sensing layer 40, display panel 50, protective film 60, and buffer member 70 may have flexible characteristics.

[0056] The window protective layer 10 protects the window 20. The window 20 included in the foldable display device 1000 may be flexible. In this case, the window 20 may be susceptible to external forces. For example, the shape of the window 20 may be deformed by external forces such as denting forces, or the window 20 may be worn down by repeated touching or similar actions by the user. The window protective layer 10 prevents the window 20 from being deformed or worn down by external forces.

[0057] The window protective layer 10 may include a flexible layer and a rigid layer stacked in sequence. The flexible layer may include polyurethane (PU), thermoplastic polyurethane (TPU), silicone (Si), polydimethylacrylamide (PDMA), and the like. The rigid layer may include silicone resin and metal oxide. The silicone resin may be silsesquioxane (SSQ), such as hydrogen silsesquioxane (HSQ) and methyl silsesquioxane (MSQ). Furthermore, the metal oxide may include alumina (Al₂O₃), silicon dioxide (SiO₂), indium tin oxide (ITO), fluorine-doped tin oxide (FTO), antimony tin oxide (ATO), zinc aluminum oxide (AZO), and the like.

[0058] Window 20 may be disposed on the bottom surface of window protective layer 10. Window 20 protects sensing layer 40 and display panel 50 from external impacts. Window 20 may include colorless polyimide, ultrathin tempered glass (UTG), polyethylene terephthalate (PET), polyimide (PI), polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), and the like.

[0059] A polarizing layer 30 may be disposed on the bottom surface of window 20. The polarizing layer 30 can reduce the reflection of external light from the foldable display device 1000. For example, when external light passes through the polarizing layer 30, it is reflected from below the polarizing layer 30 (e.g., display panel 50) and passes through the polarizing layer 30 again. The phase of the external light may change due to passing through the polarizing layer 30 twice. Accordingly, since the phase of the reflected light is different from the phase of the incident light entering the polarizing layer 30, destructive interference can occur, and therefore, the reflection of external light can be reduced, thereby improving the visibility of the foldable display device 1000.

[0060] The sensing layer 40 may be disposed on the bottom surface of the polarizing layer 30. The sensing layer 40 can sense external inputs, such as the contact or proximity of an external object to the foldable display device 1000. For example, the sensing layer 40 can sense the external input capacitively. In some embodiments of the present invention, the sensing layer 40 may be disposed on the polarizing layer 30. For example, the sensing layer 40 may be disposed between the polarizing layer 30 and the window 20.

[0061] The display panel 50 may be disposed on the bottom surface of the sensing layer 40. The display panel 50 may include multiple pixels and can generate an image by combining light emitted from the multiple pixels respectively.

[0062] A protective film 60 may be disposed on the bottom surface of the display panel 50. The protective film 60 prevents moisture and oxygen from penetrating from the outside of the foldable display device 1000 and can absorb external impacts.

[0063] A cushioning member 70 may be disposed on the bottom surface of the protective film 60. The cushioning member 70 may cushion external impacts to protect the display panel 50. For example, the cushioning member 70 may include a material that accommodates air to perform cushioning, such as a pad or sponge. In addition, the cushioning member 70 may include acrylic resin, polyurethane, thermoplastic polyurethane, latex, polyurethane foam, polystyrene foam, and the like.

[0064] Although embodiments of the flexible display module 100 including a window protective layer 10, a window 20, a polarizing layer 30, a sensing layer 40, a display panel 50, a protective film 60, and a buffer member 70 have been described above, the flexible display module 100 is not limited to the structures described above. For example, the flexible display module 100 may include any flexible structure capable of emitting light to display an image.

[0065] Reference Figure 4 The display panel 50 may include a substrate 51, a buffer layer 52, a first insulating layer IL1, a second insulating layer IL2, a transistor TR, a via insulating layer VIA, a pixel electrode 53, a light-emitting layer 54, a common electrode 55, a pixel defining layer PDL, a first inorganic layer 56, an organic layer 57, and a second inorganic layer 58. The transistor TR may include a first electrode EL1, a second electrode EL2, an active pattern ATV, and a gate electrode GE.

[0066] The substrate 51 may include glass, quartz, plastic, and the like. For example, the substrate 51 may be a plastic substrate and may include polyimide (PI). In embodiments of the invention, the substrate 51 may have a structure in which at least one polyimide layer and at least one barrier layer are stacked alternately.

[0067] A buffer layer 52 may be disposed on a substrate 51. The buffer layer 52 may include silicon oxide, silicon nitride, and the like. The buffer layer 52 prevents impurities from diffusing from the bottom surface of the buffer layer 52 to the active pattern ATV.

[0068] An active patterned ATV may be disposed on buffer layer 52. The active patterned ATV may include silicon semiconductors, oxide semiconductors, and the like. The silicon semiconductor may include amorphous silicon, polycrystalline silicon, and the like. Depending on the gate signal provided to the gate electrode GE, the active patterned ATV may allow current to flow or block current.

[0069] The first insulating layer IL1 may include an insulating material and may cover the active pattern ATV. For example, the first insulating layer IL1 may include silicon oxide, silicon nitride, titanium oxide, tantalum oxide, and the like. The first insulating layer IL1 electrically insulates the active pattern ATV and the gate electrode GE from each other.

[0070] The gate electrode GE may comprise a metal, alloy, conductive metal oxide, or the like, and may be disposed on the first insulating layer IL1. For example, the gate electrode GE may comprise silver (Ag), silver-containing alloys, molybdenum (Mo), molybdenum-containing alloys, aluminum (Al), aluminum-containing alloys, or aluminum nitrides (AlN). x ), tungsten (W), tungsten nitride (WN) x ), copper (Cu), nickel (Ni), chromium (Cr), chromium nitride (CrN) x Titanium (Ti), tantalum (Ta), platinum (Pt), scandium (Sc), indium tin oxide (ITO), indium zinc oxide (IZO) and the like.

[0071] The second insulating layer IL2 may include an insulating material and may cover the gate electrode GE. For example, the second insulating layer IL2 may include silicon oxide, silicon nitride, titanium oxide, tantalum oxide, and the like. The second insulating layer IL2 may electrically insulate the gate electrode GE from the first electrode EL1 and from the second electrode EL2.

[0072] Each of the first electrode EL1 and the second electrode EL2 may comprise a metal, alloy, conductive metal oxide, or the like, and may be disposed on the second insulating layer IL2. For example, each of the first electrode EL1 and the second electrode EL2 may comprise silver (Ag), silver-containing alloys, molybdenum (Mo), molybdenum-containing alloys, aluminum (Al), aluminum-containing alloys, or aluminum nitrides (AlN). x ), tungsten (W), tungsten nitride (WN) x ), copper (Cu), nickel (Ni), chromium (Cr), chromium nitride (CrN) x Titanium (Ti), tantalum (Ta), platinum (Pt), scandium (Sc), indium tin oxide (ITO), indium zinc oxide (IZO) and the like.

[0073] The via insulating layer VIA may cover the first electrode EL1 and the second electrode EL2, may include an organic insulating material, and may have a substantially flat top surface. For example, the via insulating layer VIA may include photoresist, polyacrylate resin, polyimide resin, acrylic resin, and the like.

[0074] Pixel electrode 53 may be disposed on the through-hole insulating layer VIA. Pixel electrode 53 may include metals, alloys, conductive metal oxides, and the like. For example, pixel electrode 53 may include silver (Ag), silver-containing alloys, molybdenum (Mo), molybdenum-containing alloys, aluminum (Al), aluminum-containing alloys, aluminum nitrides (AlN). x ), tungsten (W), tungsten nitride (WN) x ), copper (Cu), nickel (Ni), chromium (Cr), chromium nitride (CrN) x Titanium (Ti), tantalum (Ta), platinum (Pt), scandium (Sc), indium tin oxide (ITO), indium zinc oxide (IZO), and the like. Pixel electrode 53 can receive a first voltage from the second electrode EL2.

[0075] The pixel defining layer (PDL) may be disposed on the via insulating layer (VIA) and includes an opening that exposes the top surface of the pixel electrode 53. The pixel defining layer (PDL) may comprise organic materials (such as polyimide-based resins (e.g., photosensitive polyimide (PSPI)-based resins), photoresists, polyacrylic resins, and acrylic resins) or inorganic materials (such as silicon oxides and silicon nitrides).

[0076] The light-emitting layer 54 may be disposed on the pixel electrode 53. The light-emitting layer 54 may have a multilayer structure, which includes an organic emitting layer, a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer.

[0077] A common electrode 55 may be disposed on the light-emitting layer 54 and may receive a second voltage. The common electrode 55 may comprise a metal, alloy, conductive metal oxide, or the like. For example, the common electrode 55 may comprise silver (Ag), silver-containing alloys, molybdenum (Mo), molybdenum-containing alloys, aluminum (Al), aluminum-containing alloys, or aluminum nitrides (AlN). x ), tungsten (W), tungsten nitride (WN) x ), copper (Cu), nickel (Ni), chromium (Cr), chromium nitride (CrN) x Titanium (Ti), tantalum (Ta), platinum (Pt), scandium (Sc), indium tin oxide (ITO), indium zinc oxide (IZO) and the like.

[0078] The light-emitting layer 54 can generate light caused by the voltage difference between the first voltage and the second voltage. Accordingly, the pixel electrode 53, the light-emitting layer 54, and the common electrode 55 can be organic light-emitting diodes.

[0079] A thin-film encapsulation layer may be disposed on the common electrode 55. The thin-film encapsulation layer prevents moisture and oxygen from penetrating from the outside of the foldable display device 1000. For example, the thin-film encapsulation layer may have a structure in which a first inorganic layer 56, an organic layer 57, and a second inorganic layer 58 are stacked alternately.

[0080] Although embodiments of the display panel 50 including an organic emitting layer have been described above, the display panel 50 is not limited to the embodiments described above. The display panel 50 may include any structure capable of receiving electrical signals to emit light having a brightness corresponding to the intensity of the electrical signals. For example, the light-emitting layer 54 may include quantum dots (QDs). As another example, a color filter including quantum dots may be disposed on a thin-film encapsulation layer of the display panel 50.

[0081] Reference Figure 3 and Figure 5 The first support portion 200 may be disposed on the bottom surface of the flexible display module 100. For example, the first support portion 200 may be disposed in the first region NFA1, the second region NFA2, and the foldable region FA. The first support portion 200 may support the flexible display module 100. For example, the stiffness of the first support portion 200 may be greater than the stiffness of the flexible display module 100. In this case, the first support portion 200 may prevent the flexible display module 100 from deforming due to external forces from the user or similar circumstances. The first support portion 200 may include a plurality of first carbon fibers 210 extending in the first direction DR1.

[0082] The second support portion 300 may be disposed on the bottom surface of the first support portion 200. For example, the second support portion 300 may be in direct contact with the first support portion 200. The second support portion 300 may support the flexible display module 100. For example, the stiffness of the second support portion 300 may be greater than the stiffness of the flexible display module 100. In this case, the second support portion 300 may prevent the flexible display module 100 from deforming due to external forces from the user or similar circumstances. The second support portion 300 may include a plurality of second carbon fibers 310 extending in the second direction DR2. The first direction DR1 and the second direction DR2 may be different from each other. For example, the first direction DR1 and the second direction DR2 may be perpendicular to each other.

[0083] The first support portion 200 may have a first thickness D1, and the second support portion 300 may have a second thickness D2. In embodiments of the present invention, the sum D of the first thickness D1 and the second thickness D2 may be about 80 μm or greater and about 200 μm or less.

[0084] According to an embodiment of the foldable display device 1000 of the present invention, a first support portion 200 may include a first carbon fiber 210 extending in a first direction DR1, and a second support portion 300 may include a second carbon fiber 310 extending in a second direction DR2 different from the first direction DR1. Accordingly, the first support portion 200 and the second support portion 300 may have higher stiffness than a metal support portion having a thickness equal to the sum D of a first thickness D1 and a second thickness D2. Furthermore, the first support portion 200 and the second support portion 300 may have lower weight than a metal support portion. Since the first support portion 200 and the second support portion 300 respectively include the first carbon fiber 210 and the second carbon fiber 310, the first support portion 200 and the second support portion 300 may be black in color. Therefore, the first support portion 200 and the second support portion 300 may not be visually distinguishable by a user of the foldable display device 1000. Furthermore, since the first support portion 200 and the second support portion 300 respectively include the first carbon fiber 210 and the second carbon fiber 310, creases will not form on the first support portion 200 and the second support portion 300 even when the foldable display device 1000 is repeatedly folded and unfolded.

[0085] In embodiments of the invention, each of the first support portion 200 and the second support portion 300 may include carbon fiber reinforced plastic (CFRP). CFRP may include a plurality of carbon fibers extending in one direction and a bonding polymer configured to fix the carbon fibers. The bonding polymer may include an epoxy resin as a thermosetting resin.

[0086] Figure 6 This is a plan view illustrating a foldable display device according to an embodiment of the present invention. Figure 7 It is shown that it includes Figure 6 A perspective view of the support portion in a foldable display device.

[0087] Reference Figure 6 and Figure 7 The first direction DR1 and the second direction DR2 can be symmetrical to each other based on the folding axis Faxis. In this case, the angle formed by the first direction DR1 and the second direction DR2 can be θ. θ can be greater than about 0° and less than about 180°. As θ approaches about 0°, each of the first carbon fiber 210 and the second carbon fiber 310 can become relatively parallel to the folding axis Faxis. As θ approaches about 180°, each of the first carbon fiber 210 and the second carbon fiber 310 can become relatively perpendicular to the folding axis Faxis.

[0088] In embodiments of the present invention, θ can be approximately 90°. In this case, the tensile strength of the first carbon fiber 210 in the direction parallel to the folding axis Faxis can be substantially the same as the tensile strength of the first carbon fiber 210 in the direction perpendicular to the folding axis Faxis. Furthermore, the tensile strength of the second carbon fiber 310 in the direction parallel to the folding axis Faxis can be substantially the same as the tensile strength of the second carbon fiber 310 in the direction perpendicular to the folding axis Faxis. Accordingly, the durability of the first support portion 200 and the second support portion 300 relative to the foldable display device 1000 during repeated folding and unfolding can be relatively increased.

[0089] Figure 8 This is a plan view illustrating a foldable display device according to an embodiment of the present invention. Figure 9 It is shown that it includes Figure 8 A perspective view of the support portion in a foldable display device.

[0090] Reference Figure 8 and Figure 9 The first direction DR1 and the second direction DR2 can be perpendicular to each other, and the first direction DR1 can be perpendicular to the folding axis Faxis. For example, each of the first carbon fibers 210 can extend in a direction perpendicular to the folding axis Faxis. In other words, each of the first carbon fibers 210 can extend in the first direction DR1. In this case, the first carbon fibers 210 can be arranged in a direction parallel to the folding axis Faxis. In other words, a plurality of first carbon fibers 210 can be arranged in the second direction DR2. Each of the second carbon fibers 310 can extend in a direction parallel to the folding axis Faxis. In this case, the second carbon fibers 310 can be arranged in a direction perpendicular to the folding axis Faxis.

[0091] The tensile strength of the first carbon fiber 210 in the direction perpendicular to the folding axis Faxis can be greater than the tensile strength of the first carbon fiber 210 in the direction parallel to the folding axis Faxis. In other words, the tensile strength of the first carbon fiber 210 in its extension direction (i.e., the first direction DR1) can be relatively large.

[0092] The tensile strength of the second carbon fiber 310 in the direction parallel to the folding axis Faxis can be greater than the tensile strength of the second carbon fiber 310 in the direction perpendicular to the folding axis Faxis. In other words, the tensile strength of the second carbon fiber 310 in its extension direction (i.e., the second direction DR2) can be relatively large.

[0093] The tensile strength of the first carbon fiber 210 in the direction perpendicular to the folding axis Faxis is substantially the same as the tensile strength of the second carbon fiber 310 in the direction parallel to the folding axis Faxis. Furthermore, the tensile strength of the first carbon fiber 210 in the direction parallel to the folding axis Faxis is substantially the same as the tensile strength of the second carbon fiber 310 in the direction perpendicular to the folding axis Faxis.

[0094] As described above, the first direction DR1 may be perpendicular to the folding axis Faxis, and the first direction DR1 and the second direction DR2 may be perpendicular to each other. Accordingly, the durability of the first support portion 200 and the second support portion 300 relative to the foldable display device 1000 during repeated folding and unfolding can be relatively increased.

[0095] Figure 10 This is a plan view illustrating a foldable display device according to an embodiment of the present invention. Figure 11 It is shown that it includes Figure 10 A perspective view of the support portion in a foldable display device.

[0096] Reference Figure 10 and Figure 11 The first direction DR1 and the second direction DR2 can be perpendicular to each other, and the first direction DR1 can be parallel to the folding axis Faxis. For example, each of the first carbon fibers 210 can extend in a direction parallel to the folding axis Faxis. For example, each of the first carbon fibers 210 can extend in the first direction DR1. In other words, the first carbon fibers 210 can be arranged in a direction perpendicular to the folding axis Faxis. For example, a plurality of first carbon fibers 210 can be arranged in the second direction DR2. Each of the second carbon fibers 310 can extend in a direction perpendicular to the folding axis Faxis. In other words, the second carbon fibers 310 can be arranged in a direction parallel to the folding axis Faxis.

[0097] The tensile strength of the first carbon fiber 210 in the direction parallel to the folding axis Faxis can be greater than the tensile strength of the first carbon fiber 210 in the direction perpendicular to the folding axis Faxis. In other words, the tensile strength of the first carbon fiber 210 in the extension direction (i.e., the first direction DR1) can be relatively large.

[0098] The tensile strength of the second carbon fiber 310 in the direction perpendicular to the folding axis Faxis can be greater than that in the direction parallel to the folding axis Faxis. In other words, the tensile strength of the second carbon fiber 310 in the extension direction (i.e., the second direction DR2) can be relatively large.

[0099] The tensile strength of the first carbon fiber 210 in the direction parallel to the folding axis Faxis is substantially the same as the tensile strength of the second carbon fiber 310 in the direction perpendicular to the folding axis Faxis. Furthermore, the tensile strength of the first carbon fiber 210 in the direction perpendicular to the folding axis Faxis is substantially the same as the tensile strength of the second carbon fiber 310 in the direction parallel to the folding axis Faxis.

[0100] As described above, the first direction DR1 may be parallel to the folding axis Faxis, and the first direction DR1 and the second direction DR2 may be perpendicular to each other. Accordingly, the durability of the first support portion 200 and the second support portion 300 relative to the foldable display device 1000 during repeated folding and unfolding can be relatively increased.

[0101] Figure 12 This is a cross-sectional view showing a foldable display device according to an embodiment of the present invention. Figure 13 It is shown that it includes Figure 12 A perspective view of the support portion in a foldable display device.

[0102] Reference Figure 12 and Figure 13 The first support portion 200 may be disposed on the bottom surface of the flexible display module 100. The first support portion 200 may support the flexible display module 100. The first support portion 200 may include a plurality of first carbon fibers 210 extending in a first direction DR1.

[0103] The second support portion 300 may be disposed on the bottom surface of the first support portion 200. The second support portion 300 may support the flexible display module 100. The second support portion 300 may include a plurality of second carbon fibers 310 extending in the second direction DR2. For example, the second carbon fibers 310 may extend in an inclined direction between the long sides of the second support portion 300. The first direction DR1 and the second direction DR2 may be different from each other.

[0104] The third support portion 400 may be disposed on the bottom surface of the second support portion 300. For example, the third support portion 400 may be in direct contact with the second support portion 300. The third support portion 400 may completely cover the second support portion 300. The third support portion 400 may support the flexible display module 100. The third support portion 400 may include a plurality of third carbon fibers 410 extending on the third-direction DR3.

[0105] In embodiments of the present invention, the third direction DR3 may be substantially the same as the first direction DR1. When the third direction DR3 is substantially the same as the first direction DR1, the carbon fibers 210, 310, and 410 included in the support portions 200, 300, and 400 may not be lifted. In this case, as referred to above... Figure 6 and Figure 7 As described, the first direction DR1 and the second direction DR2 can be symmetrical to each other based on the folding axis Faxis. Alternatively, as referenced above... Figures 8 to 11 As described, the first direction DR1 and the second direction DR2 can be perpendicular to each other. Furthermore, the first direction DR1 and the second direction DR2 can be symmetrical about each other based on the folding axis Faxis, and the first direction DR1 and the second direction DR2 can be perpendicular to each other.

[0106] The first support portion 200 may have a first thickness D1, the second support portion 300 may have a second thickness D2, and the third support portion 400 may have a third thickness D3. In embodiments of the present invention, the sum D of the first thickness D1, the second thickness D2, and the third thickness D3 may be about 80 μm or greater and about 200 μm or less.

[0107] According to an embodiment of the foldable display device 1000 of the present invention, a first support portion 200 may include a first carbon fiber 210 extending in a first direction DR1, a second support portion 300 may include a second carbon fiber 310 extending in a second direction DR2 different from the first direction DR1, and a third support portion 400 may include a third carbon fiber 410 extending in a third direction DR3. Accordingly, the first support portion 200, the second support portion 300, and the third support portion 400 have higher stiffness than a metal support portion having a thickness equal to the sum D of the first thickness D1, the second thickness D2, and the third thickness D3. Furthermore, the first support portion 200, the second support portion 300, and the third support portion 400 may have a lower weight than a metal support portion. Since the first support portion 200, the second support portion 300, and the third support portion 400 respectively include the first carbon fiber 210, the second carbon fiber 310, and the third carbon fiber 410, the first support portion 200, the second support portion 300, and the third support portion 400 may be black in color. Therefore, the first support portion 200, the second support portion 300, and the third support portion 400 are not visually identifiable by the user of the foldable display device 1000. Furthermore, since the first support portion 200, the second support portion 300, and the third support portion 400 respectively include a first carbon fiber 210, a second carbon fiber 310, and a third carbon fiber 410, creases will not form on the first support portion 200, the second support portion 300, and the third support portion 400 even when the foldable display device 1000 is repeatedly folded and unfolded.

[0108] In embodiments of the present invention, each of the first support portion 200, the second support portion 300, and the third support portion 400 may include carbon fiber reinforced plastic (CFRP).

[0109] Figure 14 This is a cross-sectional view showing a foldable display device according to an embodiment of the present invention.

[0110] Reference Figure 14 Each of the first support portion 200 and the second support portion 300 may include a plurality of grooves H formed in the foldable region FA. The grooves H may be formed through the first support portion 200 and the second support portion 300. In an embodiment of the invention, when the foldable display device 1000 further includes a third support portion 400 disposed on the bottom surface of the second support portion 300, the foldable display device 1000 may include a plurality of grooves H that overlap with the foldable region FA of the flexible display module 100 and pass through the first support portion 200, the second support portion 300, and the third support portion 400. In other words, the third support portion 400 may also include grooves H. According to an embodiment of the invention, the first carbon fiber 210 and the second carbon fiber 310 included in the first support portion 200 and the second support portion 300 may be processed using a laser to form the grooves H.

[0111] The groove H can have various shapes. In an embodiment of the invention, the groove H can extend in a direction parallel to the folding axis Faxis and can be arranged in a direction perpendicular to the folding axis Faxis. In another embodiment of the invention, the groove H can have a rhomboid shape, and one of the two diagonals of the rhomboid shape can be parallel to the folding axis Faxis.

[0112] Since the groove H is formed in the first support portion 200 and the second support portion 300, the repulsive force against repeated folding and unfolding of the foldable display device 1000 can be reduced at the portion where the first support portion 200 and the foldable area FA overlap.

[0113] Figure 15 and Figure 16 This is a cross-sectional view illustrating a foldable display device according to an embodiment of the present invention. Details regarding... Figure 3 The redundant description of the configuration shown.

[0114] Reference Figure 15 The foldable display device 1000 may include a first plate P1 disposed on the bottom surface of the second support portion 300 and overlapping with the first region NFA1, and a second plate P2 disposed on the bottom surface of the second support portion 300 and overlapping with the second region NFA2. The first plate P1 and the second plate P2 may be spaced apart from each other by a predetermined distance D4. The predetermined distance D4 may correspond to the width of the foldable region FA between the first region NFA1 and the second region NFA2.

[0115] An adhesive layer AL can be disposed between the second support portion 300 and the first plate P1 and the second plate P2. The thickness of the portion of the adhesive layer AL overlapping the first region NFA1 can be substantially the same as the thickness of the portion of the adhesive layer AL overlapping the second region NFA2. In an embodiment of the present invention, the thickness of the portion of the adhesive layer AL overlapping the foldable region FA can be less than the thickness of the portion of the adhesive layer AL overlapping the first region NFA1. Accordingly, the flexibility of the foldable display device 1000 can be relatively increased.

[0116] Reference Figure 16 The foldable display device 1000 may include a first plate P1 disposed on the bottom surface of the second support portion 300, overlapping with the first region NFA1 and partially overlapping with the foldable region FA, and a second plate P2 disposed on the bottom surface of the second support portion 300, overlapping with the second region NFA2 and partially overlapping with the foldable region FA. The first plate P1 and the second plate P2 may be spaced apart from each other by a predetermined distance D5. The predetermined distance D5 may be less than a predetermined distance D4.

[0117] An adhesive layer AL can be disposed between the second support portion 300 and the first plate P1 and the second plate P2. The thickness of the portion of the adhesive layer AL overlapping the first region NFA1 can be substantially the same as the thickness of the portion of the adhesive layer AL overlapping the second region NFA2. In an embodiment of the present invention, the thickness of the portion of the adhesive layer AL overlapping the foldable region FA can be less than the thickness of the portion of the adhesive layer AL overlapping the first region NFA1.

[0118] Reference Figure 15 and Figure 16 The first plate P1 and the second plate P2 can support the first support portion 200, the second support portion 300, and the flexible display module 100. For example, the first plate P1 and the second plate P2 can prevent the first support portion 200, the second support portion 300, and the flexible display module 100 from deforming due to repeated folding and unfolding of the foldable display device 1000. In addition, the first plate P1 and the second plate P2 can prevent the first support portion 200, the second support portion 300, and the flexible display module 100 from deforming due to external forces such as user touch.

[0119] Each of the first plate P1 and the second plate P2 may include a metallic material. In embodiments of the invention, each of the first plate P1 and the second plate P2 may include carbon fiber reinforced plastic (CFRP). CFRP may include a plurality of carbon fibers extending in one direction and a bonded polymer configured to fix the carbon fibers. When each of the first plate P1 and the second plate P2 includes CFRP, the weight of the first plate P1 and the second plate P2 may be relatively reduced, and the stiffness of the first plate P1 and the second plate P2 may be relatively increased.

[0120] In embodiments of the present invention, the foldable display device 1000 may further include a plurality of grooves that overlap with the foldable region FA of the flexible display module 100 and pass through the first support portion 200 and the second support portion 300. In this case, at the portion where the first support portion 200 and the foldable region FA overlap, the repulsive force against repeated folding and unfolding of the foldable display device 1000 can be reduced.

[0121] Figure 17 This is a cross-sectional view showing a foldable display device according to an embodiment of the present invention. Figure 18 and Figure 19 It is shown that it includes Figure 17 A perspective view of the support portion in a foldable display device.

[0122] Reference Figures 17 to 19 The foldable display device 1000 may include a flexible display module 100, a first support portion 200, a second support portion 300, and a third support portion 400. The flexible display module 100 may include a window protective layer 10, a window 20, a polarizing layer 30, a sensing layer 40, a display panel 50, a protective film 60, and a buffer member 70. The flexible display module 100 can be used with reference to... Figures 1 to 3 The flexible display module 100 described is essentially the same. For example, Figure 17 The flexible display module 100 shown can correspond to the section shown along line I-I'. Figure 1 A cross-sectional view of the flexible display module 100.

[0123] The first support portion 200 may be disposed on the bottom surface of the flexible display module 100 and may include a plurality of first carbon fibers 210 extending in the first direction DR1. The second support portion 300 may be disposed on the bottom surface of the first support portion 200. The second support portion 300 may not include carbon fibers. For example, the second support portion 300 may include plastic. The third support portion 400 may be disposed on the bottom surface of the second support portion 300 and may include a plurality of second carbon fibers 410' extending in the second direction DR2. It can be seen that the second support portion 300 is sandwiched between the first support portion 200 and the third support portion 400.

[0124] Reference Figure 17 and Figure 18 The first direction DR1 can be the same as the second direction DR2. In other words, the direction in which the first carbon fiber 210 extends in the first support portion 200 can be substantially the same as the direction in which the second carbon fiber 410' extends in the third support portion 400.

[0125] Reference Figure 17 and Figure 19The first direction DR1 may be different from the second direction DR2. In other words, the direction in which the first carbon fiber 210 extends in the first support portion 200 may be different from the direction in which the second carbon fiber 410' extends in the third support portion 400. In embodiments of the present invention, the first direction DR1 and the second direction DR2 may be based on the folding axis ( Figure 1 The first direction DR1 and the second direction DR2 are symmetrical to each other (Faxis). In another embodiment of the invention, the first direction DR1 and the second direction DR2 may be perpendicular to each other.

[0126] The foldable display device according to embodiments of the present invention can be applied to display devices included in laptop computers, mobile phones, smartphones, smart tablets, personal multimedia players (PMPs), personal digital assistants (PDAs), and the like.

[0127] Although a foldable display device according to embodiments of the present invention has been described with reference to the accompanying drawings, the embodiments shown are examples and may be modified and altered by those skilled in the art without departing from the scope of the invention.

Claims

1. A foldable display device, comprising: A flexible display module includes a first region, a second region, and a foldable region between the first region and the second region; A first support portion is arranged below the flexible display module and includes a plurality of first carbon fibers extending in a first direction; as well as The second support portion is disposed below the first support portion and includes a plurality of second carbon fibers extending in the second direction. The plurality of first carbon fibers are arranged side by side and in a straight line on a plane, and the first carbon fibers that are adjacent to each other on the plane are in contact with each other along the entire side surface.

2. The foldable display device as claimed in claim 1, wherein, The first direction and the second direction are different from each other.

3. The foldable display device as claimed in claim 1, wherein, The flexible display module is foldable about the folding axis in the foldable region, and The first direction and the second direction are symmetrical to each other based on the folding axis.

4. The foldable display device as claimed in claim 1, wherein, The flexible display module is foldable about the folding axis in the foldable region, and The first direction and the second direction are perpendicular to each other.

5. The foldable display device as claimed in claim 4, wherein, The first direction is parallel to the folding axis.

6. The foldable display device as claimed in claim 4, wherein, The first direction is perpendicular to the folding axis.

7. The foldable display device of claim 1, further comprising a third support portion disposed below the second support portion and including a plurality of third carbon fibers extending upward therefrom.

8. The foldable display device as claimed in claim 7, wherein, The third direction is the same as the first direction.

9. The foldable display device as claimed in claim 8, wherein, The flexible display module is foldable about the folding axis in the foldable region. The first direction and the second direction are symmetrical to each other based on the folding axis, and The first direction and the second direction are perpendicular to each other.

10. The foldable display device as claimed in claim 1, wherein, Each of the first support portion and the second support portion comprises carbon fiber reinforced plastic.

11. The foldable display device as claimed in claim 1, wherein, Each of the first support portion and the second support portion further includes a plurality of grooves in the foldable region.

12. The foldable display device of claim 1, further comprising: The first plate is arranged below the second support and overlaps with the first region; as well as The second plate is arranged below the second support portion, overlaps with the second region, and is spaced apart from the first plate.

13. The foldable display device as claimed in claim 12, wherein, Each of the first and second plates partially overlaps with the foldable region.

14. The foldable display device as claimed in claim 12, wherein, Each of the first plate and the second plate comprises carbon fiber reinforced plastic.

15. A foldable display device, comprising: A flexible display module includes a first region, a second region, and a foldable region between the first region and the second region; A first support portion is arranged below the flexible display module and includes a plurality of first carbon fibers extending in a first direction; The second support portion is arranged below the first support portion; as well as The third support portion is disposed below the second support portion and includes a plurality of second carbon fibers extending in the second direction. The plurality of first carbon fibers are arranged side by side and in a straight line on a plane, and the first carbon fibers that are adjacent to each other on the plane are in contact with each other along the entire side surface.

16. The foldable display device as claimed in claim 15, wherein, The first direction is the same as the second direction.

17. The foldable display device as claimed in claim 15, wherein, The first direction is different from the second direction.

18. The foldable display device of claim 17, wherein, The flexible display module is foldable about the folding axis in the foldable region, and The first direction and the second direction are symmetrical to each other based on the folding axis.

19. The foldable display device as claimed in claim 17, wherein, The first direction and the second direction are perpendicular to each other.

20. The foldable display device as claimed in claim 15, wherein, The second support does not include carbon fiber.

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