Foldable display and method for manufacturing the same

Abstract

The foldable display (1) includes: a flexible display panel (4), which includes: an impact absorbing layer (2) including a metal film; and a display layer (3) provided on a surface on one side of the impact absorbing layer (2); a first region (R1), a second region (R2), and a third region (R3), which are regions of the flexible display panel (4), and the third region (R3) is located between the first region (R1) and the second region (R2); a first supporting substrate (5), which is non-flexible and supports the first region (R1) from the impact absorbing layer (2) side; a second supporting substrate (6), which is non-flexible and supports the second region (R2) from the impact absorbing layer (2) side; and a bending mechanism. (7), which is connected to the first supporting substrate (5) and the second supporting substrate (6) and overlaps with the third region (R3) when viewed from above; and a slit (SL1, SL2), which is a metal film provided at at least one of a first position and a second position, the first position being a position in the first region (R1) where the shortest distance to the third region (R3) is closer than the shortest distance to the end of the first region (R1) on the side opposite to the third region (R3), and the second position being a position in the second region (R2) where the shortest distance to the third region (R3) is closer than the shortest distance to the end of the second region (R2) on the side opposite to the third region (R3).

Description

Technical Field

[0001] The present disclosure relates to a foldable display and a method of manufacturing the foldable display. Background Art

[0002] In recent years, foldable displays including flexible display panels including OLED (Organic Light Emitting Diode) or QLED (Quantum dot Light Emitting Diode) as light-emitting elements have attracted much attention.

[0003] However, in the field of foldable displays, there is a problem that satisfactory durability cannot be achieved, and research to improve durability is being actively conducted.

[0004] For example, Patent Document 1 describes a foldable display including a flexible display panel, a plate formed of stainless steel, and a plurality of gears under a bent region of the plate.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-21092 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] In the foldable display described in Patent Document 1, a design is employed to facilitate bending by providing multiple openings throughout the entire bending region, created by multiple gears. However, this configuration suffers from a problem of reduced impact resistance due to the multiple openings created by the multiple gears throughout the entire bending region.

[0010] One aspect of the present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a foldable display having high impact resistance and bending resistance and a method for manufacturing the foldable display.

[0011] Solutions for solving problems

[0012] In order to solve the above problems, the foldable display disclosed herein includes:

[0013] A flexible display panel comprising: an impact absorbing layer comprising a metal film; and a display layer provided on one surface of the impact absorbing layer;

[0014] a first region, a second region, and a third region, which are regions of the flexible display panel, wherein the third region is located between the first region and the second region;

[0015] a first supporting substrate having inflexibility and supporting the first region from the impact absorbing layer side;

[0016] a second supporting substrate having inflexibility and supporting the second region from the impact absorbing layer side;

[0017] a bending mechanism connected to the first supporting substrate and the second supporting substrate and overlapping with the third region in a plan view; and

[0018] A slit is provided in the metal film at at least one of a first position and a second position, wherein the first position is a position in the first region where the shortest distance to the third region is closer than the shortest distance to the end of the first region on the side opposite to the third region, and the second position is a position in the second region where the shortest distance to the third region is closer than the shortest distance to the end of the second region on the side opposite to the third region.

[0019] In order to solve the above problems, the manufacturing method of the foldable display disclosed in the present invention includes:

[0020] a step of forming a flexible display panel including a display layer on a side of an impact absorbing layer including a metal film; and

[0021] a fixing step of fixing the first region of the flexible display panel to a non-flexible first supporting substrate from the impact absorbing layer side, fixing the second region of the flexible display panel to a non-flexible second supporting substrate from the impact absorbing layer side, and making the third region of the flexible display panel located between the first region and the second region overlap with a bending mechanism connected to the first supporting substrate and the second supporting substrate in a plan view;

[0022] The process of forming the flexible display panel also includes a process of setting a slit in the metal film at at least one of a first position and a second position, wherein the first position is a position in the first region where the shortest distance to the third region is closer than the shortest distance to the end of the first region on the side opposite to the third region, and the second position is a position in the second region where the shortest distance to the third region is closer than the shortest distance to the end of the second region on the side opposite to the third region.

[0023] Effects of the Invention

[0024] According to one aspect of the present disclosure, a foldable display having high impact resistance and bending resistance and a method for manufacturing the foldable display can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a cross-sectional view showing a schematic configuration of a foldable display according to the first embodiment.

[0026] Figure 2 (a) is a top view of the flexible display panel included in the foldable display according to Embodiment 1. Figure 2 (b) is a plan view of a modified example of the flexible display panel that the foldable display of the first embodiment may include.

[0027] Figure 3 This is a cross-sectional view showing a schematic configuration of a flexible display panel included in the foldable display according to the first embodiment.

[0028] Figure 4 (a), (b), and (c) are cross-sectional views schematically illustrating a modified example of the flexible display panel that can be included in the foldable display of the first embodiment.

[0029] Figure 5 This is a diagram showing a state where the foldable display according to the first embodiment is folded into a U-shape.

[0030] Figure 6 This is a diagram showing a schematic configuration of a sample panel without slits.

[0031] Figure 7 (a), (b), and (c) are diagrams for explaining preferred positions for providing slits when the foldable display of Embodiment 1 is folded into a U shape.

[0032] Figure 8 (a) is a diagram showing a case where a modified example of the foldable display according to the first embodiment is bent into a drop shape. Figure 8 (b) is Figure 8 (a) is a top view of a modified example of the foldable display according to embodiment 1.

[0033] Figure 9 (a) and (b) are diagrams for explaining preferred positions for providing slits when the modified example of the foldable display according to the first embodiment is folded into a drop shape.

[0034] Figure 10 This is a diagram showing a schematic structure of another sample panel in which no slits are provided.

[0035] Figure 11 This is a cross-sectional view showing a schematic configuration of a foldable display according to a second embodiment.

[0036] Figure 12 This is a cross-sectional view showing a schematic configuration of a flexible display panel included in a foldable display according to a third embodiment.

[0037] Figure 13 (a), (b), (c), (d) and (e) show the Figure 12 The diagram shows an example of a method for manufacturing a foldable display according to Embodiment 3 of the flexible display panel.

[0038] Figure 14 This is a cross-sectional view schematically illustrating a modified example of a flexible display panel that can be included in the foldable display of the fourth embodiment.

[0039] Figure 15 (a) and (b) are cross-sectional views schematically illustrating the configuration of another modified example of the flexible display panel that can be included in the foldable display of the fourth embodiment.

[0040] Figure 16 (a), (b), (c), (d), (e), (f), (g) and (h) are diagrams showing the Figure 14 and Figure 15 A diagram illustrating an example of a method for manufacturing a foldable display using a flexible display panel.

[0041] Figure 17 This is a cross-sectional view showing a schematic configuration of a flexible display panel included in a foldable display according to a fifth embodiment.

[0042] Figure 18 (a), (b), (c) and (d) show the Figure 17 A diagram illustrating an example of a method for manufacturing a foldable display using a flexible display panel.

[0043] Figure 19 (a), (b), (c), (d), (e), (f), (g) and (h) are diagrams showing the Figure 17 Another example of a method for manufacturing a foldable display using a flexible display panel is shown. DETAILED DESCRIPTION

[0044] based on Figures 1 to 19 Hereinafter, for the sake of convenience, configurations having the same functions as those described in a specific embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0045] [Implementation Method 1]

[0046] Figure 1This is a cross-sectional view showing a schematic configuration of the foldable display 1 according to the first embodiment.

[0047] like Figure 1 As shown, the foldable display 1 includes a flexible display panel 4 , which includes an impact absorbing layer 2 including a metal film and a display layer 3 provided on one surface of the impact absorbing layer 2 .

[0048] The flexible display panel 4 includes a first region R1 , a second region R2 , and a third region R3 located between the first region R1 and the second region R2 .

[0049] The foldable display 1 further includes: a first supporting substrate 5, which is a non-flexible substrate that supports the first region R1 of the flexible display panel 4 from the impact absorbing layer 2 side; a second supporting substrate 6, which is a non-flexible substrate that supports the second region R2 of the flexible display panel 4 from the impact absorbing layer 2 side; and a bending mechanism 7, which is connected to the first supporting substrate 5 and the second supporting substrate 6 and overlaps with the third region R3 when viewed from above.

[0050] The impact absorbing layer 2 in the first region R1 of the flexible display panel 4 of the foldable display 1 has slits SL1 , and the impact absorbing layer 2 in the second region R2 of the flexible display panel 4 of the foldable display 1 has slits SL2 .

[0051] In addition, if Figure 1 As shown, the foldable display 1 has a curvature center GC of the third region R3 which is the center of the third region R3 in the left-right direction in the figure.

[0052] The impact-absorbing layer 2 is provided to absorb impacts on the foldable display 1 and must include at least a metal film. By including a metal film, the impact-absorbing layer 2 can effectively absorb impacts on the foldable display 1 along with other layers of the foldable display 1, such as the organic layer.

[0053] In this embodiment, the case where the impact absorbing layer 2 includes a metal film, an adhesive layer provided on one side of the metal film, and an adhesive layer provided on the other side of the metal film is cited as an example for explanation, but the present invention is not limited to this. For example, the impact absorbing layer 2 may also be configured not to include at least one of the adhesive layers, or may be configured to further include a polymer film as in the embodiment described later.

[0054] The display layer 3 is a flexible layer. In this embodiment, as a light-emitting element, an OLED (Organic Light Emitting Diode), a TFT element for controlling the light-emitting element, a capacitor element, and their wiring are cited as an example for explanation, but the present invention is not limited to this. For example, as a light-emitting element, a QLED (Quantum dot Light Emitting Diode) can be used instead of an OLED, and as a light-emitting element, a structure including both an OLED and a QLED can be used. Moreover, a structure including, for example, a reflective liquid crystal display layer can also be used instead of a light-emitting element. That is, the display layer 3 is not particularly limited in type as long as it is a flexible display layer.

[0055] Furthermore, when the display layer 3 includes OLEDs or QLEDs as light-emitting elements, the display layer 3 preferably further includes a sealing layer that covers these light-emitting elements. The sealing layer can include, for example, a first inorganic layer, an organic layer, and a second inorganic layer, but is not limited thereto and may be formed solely of an inorganic layer or solely of an organic layer.

[0056] Although not shown in the figure, the foldable display 1 may also have a surface ( Figure 1 On the upper surface of the display layer 3), for example, a flexible cover is provided to protect the flexible functional layer (for example, a touch panel) and the display layer 3. As an example of the flexible cover, a well-known window film processed with a hard coat can be cited.

[0057] As long as the first supporting substrate 5 and the second supporting substrate 6 are each non-flexible, their materials are not particularly limited, but preferably have a space inside them for storing a power source (for example, a battery), a drive circuit, etc. By setting it to such a structure, a thinner foldable display 1 can be achieved, and the power source and the drive circuit will not be bent, so a foldable display 1 with improved reliability can be achieved. In addition, the first supporting substrate 5 and the second supporting substrate 6 can be fixed to the impact absorbing layer 2, for example, by using an adhesive layer or the like, or by using a fixing mechanism such as screws. Moreover, it is also possible to fix only the outer edge portions of the first supporting substrate 5 and the second supporting substrate 6 using an adhesive layer or tape.

[0058] The bending mechanism 7 is, for example, a hinge capable of being fixed in a bent state. The bending mechanism 7 is not particularly limited in material as long as it is connected to the first support substrate 5 and the second support substrate 6 and overlaps the third region R3 when viewed from above. For example, a metal material with multiple holes may be used.

[0059] Figure 2 (a) is a plan view of the flexible display panel 4 included in the foldable display 1 according to the first embodiment. Figure 2 (b) is a plan view of the flexible display panel 4a that the foldable display 1 according to the first embodiment may include.

[0060] like Figure 2 As shown in (a), the flexible display panel 4 includes a first region R1 supported by a first supporting substrate 5, a second region R2 supported by a second supporting substrate 6, and a third region R3 located between the first region R1 and the second region R2.

[0061] In this embodiment, if Figure 2 As shown in (a), in the flexible display panel 4 of the foldable display 1, a slit SL1 is provided in the metal film at the first position in the first region R1, where the shortest distance LB from the third region R3 is closer than the shortest distance LA from the end of the first region R1 on the side opposite to the third region R3, and a slit SL2 is provided in the metal film at the second position in the second region R2, where the shortest distance LD from the third region R3 is closer than the shortest distance LC from the end of the second region R2 on the side opposite to the third region R3. For example, the slit may be provided in only one of the metal film at the first position and the metal film at the second position.

[0062] Moreover, in this embodiment, a case where one slit is provided in each of the first region R1 and the second region R2 of the flexible display panel 4 is cited as an example for explanation, but the invention is not limited thereto. Multiple slits may also be provided in each of the first region R1 and the second region R2 of the flexible display panel 4.

[0063] In addition, when multiple slits are provided in each of the first region R1 and the second region R2 of the flexible display panel 4, it is sufficient that at least one of the multiple slits provided in the first region R1 is provided at the above-mentioned first position, and it is sufficient that at least one of the multiple slits provided in the second region R2 is provided at the above-mentioned second position.

[0064] In this embodiment, if Figure 2 As shown in (a), the case where the slit SL1 and the slit SL2 are formed in a straight line along the bending center GC of the third region R3 extending in a straight line is cited as an example for explanation, but it is not limited to this. As long as the above-mentioned first position or the above-mentioned second position is satisfied, the slit can also be formed in a slant shape that is not parallel to the bending center GC of the third region R3, and can also be formed in a curved shape.

[0065] In addition, if Figure 2 As shown in (a), in the flexible display panel 4, a slit SL1 is provided in the metal film of the first region R1, and a slit SL2 is provided in the metal film of the second region R2. The metal film of the first region R1 is divided into two parts by the slit SL1, and the metal film of the second region R2 is divided into two parts by the slit SL2.

[0066] The foldable display 1 of the first embodiment may also include Figure 2 (b) The flexible display panel 4a shown in FIG. Figure 2 The flexible display panel 4 shown in (a) is shown in FIG. Figure 2 In the flexible display panel 4a shown in (b), the shapes of the slits SL1' and SL2' are similar to those of Figure 2 The slits SL1 and SL2 in the flexible display panel 4 shown in (a) have different shapes.

[0067] exist Figure 2 In the flexible display panel 4a shown in (b), the slit SL1' includes a plurality of sub-slits SSL1, and the plurality of sub-slits SSL1 are formed by being separated by a distance S. The distance S between the plurality of sub-slits SSL1 is equivalent to a connecting portion, and preferably the distance S is less than 100 μm. Similarly, the slit SL2' includes a plurality of sub-slits SSL2, and the plurality of sub-slits SSL2 are formed by being separated by a distance S. The distance S between the plurality of sub-slits SSL2 is equivalent to a metal connecting portion, and preferably the distance S is less than 100 μm. In this way, when using Figure 2 Although the details will be described later, the presence of the metal connection portion allows the foldable display 1 to be laminated to the size of the individual pieces, facilitating alignment and adjusting the alignment, thereby eliminating misalignment and improving yield. Figure 2 In the case of the slits SL1' and SL2' shown in (b), for example, when the foldable display 1 is bent (for example, 100 times or less) during the pre-shipment inspection, the metal connection portion may be cut off. However, even if the metal connection portion is cut off, it will hardly affect the foldable display 1 and will not affect the display quality of the foldable display 1. Therefore, Figure 2 The slits SL1 and SL2 in the flexible display panel 4 shown in (a) and Figure 2 The slits SL1 ′ and SL2 ′ in the flexible display panel 4 a shown in (b) can both function as slits.

[0068] Figure 2 The slits SL1 and SL2 shown in (a) and Figure 2The widths of the slits SL1′ and SL2′ shown in (b) in the direction perpendicular to the bending center GC of the third region R3 extending in a straight line ( Figure 2 The width in the upper and lower directions, Figure 1 The illustrated slit width SL1W and the slit width SL2W are preferably 500 μm or less, and more preferably 200 μm or less.

[0069] Figure 3 This is a cross-sectional view showing a schematic configuration of the flexible display panel 4 included in the foldable display 1 according to the first embodiment.

[0070] Figure 4 (a) Figure 4 (b) and Figure 4 (c) is a cross-sectional view schematically showing a modified example of the flexible display panel that the foldable display 1 according to the first embodiment may include.

[0071] like Figure 3 As shown, the flexible display panel 4 includes: an impact absorbing layer 2 including a metal film 2m; and a display layer 3 provided on one side of the impact absorbing layer 2. In this embodiment, the impact absorbing layer 2 further includes a first adhesive layer 2a provided on one side of the metal film 2m and a second adhesive layer 2b provided on the other side of the metal film 2m, and the slits SL1 and SL2 are provided in the first adhesive layer 2a, the second adhesive layer 2b and the metal film 2m as an example for explanation, but the present invention is not limited to this. For example, Figure 4 As shown in (a), the flexible display panel 4b includes: an impact absorbing layer 2 including a metal film 2m; and a display layer 3 provided on one side of the impact absorbing layer 2. Alternatively, the impact absorbing layer 2 may further include: a first adhesive layer 2a provided on one side of the metal film 2m; and a second adhesive layer 2b provided on the other side of the metal film 2m, and the slits SL1 and SL2 are provided only in the metal film 2m. In addition, as Figure 4 As shown in (b), the flexible display panel 4c includes: an impact absorbing layer 2 including a metal film 2m; and a display layer 3 provided on one side of the impact absorbing layer 2. Alternatively, the impact absorbing layer 2 may further include: a first adhesive layer 2a provided on one side of the metal film 2m; and a second adhesive layer 2b provided on the other side of the metal film 2m, and slits SL1 and SL2 are provided in the metal film 2m and the first adhesive layer 2a. Figure 4As shown in (c), the flexible display panel 4d includes: an impact absorbing layer 2 including a metal film 2m; and a display layer 3 provided on one surface of the impact absorbing layer 2. Furthermore, the impact absorbing layer 2 may further include: a first adhesive layer 2a provided on one surface of the metal film 2m; and a second adhesive layer 2b provided on the other surface of the metal film 2m, with slits SL1 and SL2 provided in the metal film 2m and the second adhesive layer 2b. As shown above, the slits may be provided only in the metal film 2m, or in at least one of the first adhesive layer 2a and the second adhesive layer 2b as well as the metal film 2m. In addition, the first adhesive layer 2a and the second adhesive layer 2b are preferably transparent adhesive layers (OCA).

[0072] Furthermore, the metal film 2m preferably includes at least one of stainless steel, aluminum, titanium, and copper.

[0073] The thickness of the metal film 2 m is preferably not less than 10 μm and not more than 100 μm, and more preferably not less than 20 μm and not more than 50 μm.

[0074] Figure 1 The manufacturing method of the foldable display 1 shown includes the steps of forming flexible display panels 4, 4a to 4d, wherein the flexible display panels 4, 4a to 4d are formed on a substrate including a metal film 2m ( Figure 3 A flexible display panel having a display layer 3 on a surface on one side of an impact absorbing layer 2 (as shown in the figure); and a fixing process of fixing a first region R1 of the flexible display panel 4, 4a to 4d to a first non-flexible support substrate 5 from the impact absorbing layer 2 side, fixing a second region R2 of the flexible display panel 4, 4a to 4d to a second non-flexible support substrate 6 from the impact absorbing layer 2 side, and making a third region R3 of the flexible display panel 4, 4a to 4d located between the first region R1 and the second region R2 overlap with a bending mechanism 7 connected to the first support substrate 5 and the second support substrate 6 when viewed from above, as shown in the figure; Figure 2 (a) and Figure 2 As shown in (b), the process of forming the flexible display panels 4, 4a~4d also includes the process of setting slits SL1, SL2, SL1', SL2' in the metal film 2m at at least one of the first position and the second position, the first position being a position in the first region R1 where the shortest distance LB to the third region R3 is closer than the shortest distance LA to the end of the first region R1 on the side opposite to the third region R3, and the second position being a position in the second region R2 where the shortest distance LD to the third region R3 is closer than the shortest distance LC to the end of the second region R2 on the side opposite to the third region R3.

[0075] In the fixing step, for example, the first support substrate 5 and the second support substrate 6 may be fixed to the impact absorbing layer 2 by bonding them to each other using an adhesive layer or the like. For example, the first support substrate 5 and the second support substrate 6 may be fixed to the impact absorbing layer 2 using a fixing mechanism such as screws. Furthermore, the first support substrate 5 and the second support substrate 6 may be fixed only to their outer edges using an adhesive layer or tape.

[0076] Figure 5 This is a diagram showing a state where the foldable display 1 according to the first embodiment is folded into a U-shape.

[0077] In addition, Figure 5 , only the flexible display panel 4 included in the foldable display 1 according to the first embodiment is illustrated.

[0078] The first region R1 of the flexible display panel 4 is supported by a first supporting substrate 5, which is a non-flexible substrate (not shown), and is therefore in a non-bent state. The second region R2 of the flexible display panel 4 is supported by a second supporting substrate 6, which is also a non-flexible substrate (not shown), and is therefore in a non-bent state. The third region R3 of the flexible display panel 4 is in a first bent state, in which the bending radius r of the display layer 3 is smaller than the bending radius R of the impact absorbing layer 2. The bent shape of the flexible display panel 4 is a U-shape.

[0079] In addition, if Figure 5 As shown, the bending radius r of the display layer 3 is from Figure 2 On a plane formed in a direction perpendicular to the bending center GC of the third region R3 extending in a straight line as shown in (a) ( Figure 5 The bending radius R of the impact absorbing layer 2 is the length on the plane from the bending center point C existing on the plane to the display layer 3, and the bending radius R of the impact absorbing layer 2 is the length on the plane from the bending center point C existing on the plane to the surface of the impact absorbing layer 2 opposite to the surface in contact with the display layer 3. In other words, the bending radius r of the display layer 3 is the length excluding the thickness of the display layer 3, and the bending radius R of the impact absorbing layer 2 is the length including the thickness of the impact absorbing layer 2.

[0080] Figure 6 This is a diagram showing a schematic configuration of a sample panel 101 in which no slits are provided.

[0081] Figure 6The sample panel 101 shown is a laminated body formed by laminating, from the impact absorbing layer 120 side, the impact absorbing layer 120, the display layer 3, the functional layer 124, and the cover layer 126 in this order. The impact absorbing layer 120 is formed by laminating, from the second polymer film 2q side, the second adhesive layer 2b, the metal film 112m without slits, the first adhesive layer 2a, the first polymer film 2p, and the third adhesive layer 2c provided between the first polymer film 2p and the display layer 3 in this order. The functional layer 124 is formed by laminating, from the fourth adhesive layer 121a side, the fourth adhesive layer 121a provided between the display layer 3 and the touch panel 122, the touch panel 122, the fifth adhesive layer 121b, and the polarizing plate 123 in this order. The cover layer 126 is formed by laminating the sixth adhesive layer 121c, which is provided between the polarizing plate 123 and the window film 125, and the window film 125 in this order, starting from the sixth adhesive layer 121c side. In the sample panel 101, the third adhesive layer 2c, the fourth adhesive layer 121a, the fifth adhesive layer 121b, and the sixth adhesive layer 121c are transparent adhesive layers (OCA).

[0082] Figure 7 (a) Figure 7 (b) and Figure 7 (c) is a diagram for explaining preferred positions for providing slits when the foldable display 1 according to the first embodiment is folded into a U-shape.

[0083] Figure 7 (a) shows that the fixing member 102 is fixed by a tape or the like. Figure 6 The diagram shows a simulation in which a sample panel 101 without slits is fixed to a bending jig 100 including two inflexible support substrates.

[0084] The sample panel 101 was bent using a bending jig 100 so that the bending radius R of the impact absorbing layer 120 including the second polymer film 2q, the second adhesive layer 2b, the metal film 112m without the slits, the first adhesive layer 2a, the first polymer film 2p, and the third adhesive layer 2c became 1.5 mm, 2.0 mm, 2.5 mm, and 3.0 mm. Figure 5 The simulation results were obtained for each bending radius R for the U-shape shown.

[0085] Figure 7 (b) is to bend the sample panel 101 in such a manner that the bending radius R of the impact absorbing layer 120 of the sample panel 101 becomes 1.5 mm, 2.0 mm, 2.5 mm and 3.0 mm. Figure 5In the case of the U-shape shown, the simulation results of the position where the maximum peeling stress occurs are expressed as the distance from the bend center. Note that the peeling stress refers to the force that peels off the film or films included in the sample panel 101 .

[0086] like Figure 7 As shown in (b), when the bending radius R is 1.5 mm, the position where the maximum peeling stress is generated is 5 mm away from the center of the bend, when the bending radius R is 2.0 mm, the position where the maximum peeling stress is generated is 5.9 mm away from the center of the bend, when the bending radius R is 2.5 mm, the position where the maximum peeling stress is generated is 6.9 mm away from the center of the bend, and when the bending radius R is 3.0 mm, the position where the maximum peeling stress is generated is 7.8 mm away from the center of the bend.

[0087] Figure 7 (c) is a diagram for explaining the maximum peeling stress position and the preferred position for providing the slit.

[0088] like Figure 7 As shown in (c), when the sample panel 101 is bent into a U-shape so that the bending radius R becomes 1.0 mm or more, the maximum peeling stress position is within the range of 2πR / 4 or more and 2πR / 4×3 or less in terms of the distance from the bending center. Figure 5 When the foldable display 1 is bent into a U shape in such a manner that the bending radius R of the impact absorbing layer 2 of the third region R3 of the flexible display panel 4 shown becomes greater than 1.0 mm, the slits SL1 and SL2 are preferably arranged in an area where the shortest distance from the bending center GC of the third region R3 extending in a straight line is greater than π×R×0.5 and less than π×R×1.5.

[0089] Moreover, if Figure 7 As shown in (c), when the sample panel 101 is bent into a U-shape with a bending radius R of 2.0 mm or more, the maximum peel stress position is within the range of 2πR / 4 or more and 2πR / 4×2 or less in terms of the distance from the bending center. Figure 5 When the foldable display 1 is bent into a U shape in such a manner that the bending radius R of the impact absorbing layer 2 of the third region R3 of the flexible display panel 4 shown becomes greater than 2.0 mm, the slits SL1 and SL2 are preferably arranged in an area where the shortest distance from the bending center GC of the third region R3 extending in a straight line is greater than π×R×0.5 and less than π×R.

[0090] Figure 8(a) is a diagram showing a case where a modified example of the foldable display according to the first embodiment is bent into a drop shape. Figure 8 (b) is Figure 8 (a) is a top view of a modified example of the foldable display according to embodiment 1.

[0091] In addition, Figure 8 (a) and Figure 8 In (b), only the flexible display panel 4 ′ included in the modified example of the foldable display 1 according to the first embodiment is illustrated.

[0092] like Figure 8 (a) and Figure 8 As shown in (b), in the case of the flexible display panel 4', the length of the third region R3 in the direction perpendicular to the bending center GC of the third region R3 extending in a straight line ( Figure 8 The length in the up-down direction in (b)) includes a portion of the area R3a starting from the bending center GC of the third region R3 extending in a straight line (a portion of the third region in the first bending state), and the remaining areas R3b and R3b' (a portion of the third region in the second bending state), and is therefore set to be relatively long.

[0093] like Figure 8 (a) and Figure 8 As shown in (b), the first region R1 of the flexible display panel 4' is supported by the first supporting substrate 5, which is a non-flexible substrate (not shown), and is therefore in a non-bent state. The second region R2 of the flexible display panel 4' is supported by the second supporting substrate 6, which is also a non-flexible substrate (not shown), and is therefore in a non-bent state. In the third region R3 of the flexible display panel 4', a portion R3a extending from the bending center GC of the third region R3 extending in a straight line is in the first bending state, in which the bending radius r of the display layer 3 is smaller than the bending radius R of the impact absorbing layer 2. The remaining regions R3b and R3b' are in the second bending state, in which the bending radius r of the display layer 3 is larger than the bending radius R of the impact absorbing layer 2. The bent shape of the flexible display panel 4' is a drop shape.

[0094] In a portion of the region R3a extending from the curvature center GC of the third region R3 extending in a straight line, the curvature radius r of the display layer 3 is the curvature radius r of the display layer 3 from the curvature center GC of the third region R3 extending in a straight line. Figure 8 On a plane formed in a direction perpendicular to the bending center GC of the third region R3 extending in a straight line as shown in (b) ( Figure 5The bending radius R of the impact absorbing layer 2 is the length on the plane from the bending center point C existing on the plane to the display layer 3, and the bending radius R of the impact absorbing layer 2 is the length on the plane from the bending center point C existing on the plane to the surface of the impact absorbing layer 2 opposite to the surface in contact with the display layer 3. In other words, the bending radius r of the display layer 3 is the length excluding the thickness of the display layer 3, and the bending radius R of the impact absorbing layer 2 is the length including the thickness of the impact absorbing layer 2.

[0095] In the remaining region R3b, the curvature radius r of the display layer 3 is the radius of curvature r from the region R3b to the region R3b. Figure 8 On a plane formed in a direction perpendicular to the bending center GC of the third region R3 extending in a straight line as shown in (b) ( Figure 8 The length on the plane from the bending center point D existing on the plane of (a) to the surface of the display layer 3 opposite to the surface in contact with the impact absorbing layer 2 is defined as follows: The bending radius R of the impact absorbing layer 2 is defined as the length on the plane from the bending center point D existing on the plane to the impact absorbing layer 2. In the remaining region R3b', the bending radius r of the display layer 3 is defined as the length on the plane from the bending center point D existing on the plane to the impact absorbing layer 2. Figure 8 On a plane formed in a direction perpendicular to the bending center GC of the third region R3 extending in a straight line as shown in (b) ( Figure 8 The length on the plane is from the bending center point E existing on the plane (a) to the surface of the display layer 3 opposite to the surface in contact with the impact absorbing layer 2, and the bending radius R of the impact absorbing layer 2 is the length on the plane from the bending center point E existing on the plane to the impact absorbing layer 2. That is, in the remaining regions R3b and R3b', the bending radius r of the display layer 3 is the length including the thickness of the display layer 3, and the bending radius R of the impact absorbing layer 2 is the length excluding the thickness of the impact absorbing layer 2.

[0096] Figure 9 (a) and Figure 9 (b) is a diagram for explaining preferred positions for providing slits when the modified example of the foldable display 1 according to the first embodiment is folded into a drop shape.

[0097] Figure 10 This is a diagram showing a schematic configuration of another sample panel 104 in which no slits are provided.

[0098] Figure 10The sample panel 104 shown is a laminated body formed by laminating, from the impact absorbing layer 120' side, the impact absorbing layer 120', the display layer 3, the functional layer 124, and the cover layer 126 in this order. The impact absorbing layer 120' is formed by laminating, from the side of the metal film 112m without slits, the metal film 112m, the first adhesive layer 2a, the first polymer film 2p, and the third adhesive layer 2c disposed between the first polymer film 2p and the display layer 3 in this order. The functional layer 124 is formed by laminating, from the side of the fourth adhesive layer 121a, the fourth adhesive layer 121a disposed between the display layer 3 and the touch panel 122, the touch panel 122, the fifth adhesive layer 121b, and the polarizing plate 123 in this order. The cover layer 126 is formed by laminating the sixth adhesive layer 121c, which is provided between the polarizing plate 123 and the window film 125, and the window film 125 in this order, starting from the sixth adhesive layer 121c side. In the sample panel 104, the third adhesive layer 2c, the fourth adhesive layer 121a, the fifth adhesive layer 121b, and the sixth adhesive layer 121c are transparent adhesive layers (OCA).

[0099] Figure 9 (a) is a diagram showing a simulation in which a sample panel 104 having no slits is fixed to a fixing jig 103 including two inflexible support substrates.

[0100] The sample panel 104 is bent using the fixing fixture 103. Figure 8 The simulation results were obtained for the drop shape shown in (a).

[0101] Figure 9 (b) shows the location where peeling stress is generated and the location where compressive stress is generated in the sample panel 104. Figure 9 As shown in (b), it can be seen that the peeling stress increases in the flat area (non-bend area) fixed by the fixing jig 103, particularly in the area close to the bend area within the flat area (non-bend area) fixed by the fixing jig 103. Therefore, the film or various films included in the sample panel 104 may peel off in the flat area (non-bend area) fixed by the fixing jig 103, particularly in the area close to the bend area within the flat area (non-bend area) fixed by the fixing jig 103. Therefore, it is preferable to provide a slit in the flat area (non-bend area) of the sample panel 104 fixed by the fixing jig 103, and it is more preferable to provide a slit in the area close to the bend area within the flat area (non-bend area) fixed by the fixing jig 103.

[0102] As mentioned above, preferably Figure 8 (a) and Figure 8As shown in FIG. 5( b ), the slits SL1 and SL2 are provided in the first region R1 and the second region R2 of the flexible display panel 4 ′ so as to contact the regions R3 b and R3 b ′ in the second bent state of the third region R3 .

[0103] To fulfill its shock-absorbing function, the impact-absorbing layer 2 necessarily includes the metal film 2m. However, the metal film 2m has a higher elastic modulus than other components. When subjected to the same stress (when bent), the metal film 2m experiences less strain than other components. Consequently, the metal film 2m causes significant deformation (strain) stress to other components. Consequently, the presence of the metal film 2m can easily cause buckling.

[0104] In the flexible display panels 4, 4', 4a-4d of the foldable display 1 of this embodiment, which include an impact-absorbing layer 2 and a display layer 3, and in which the impact-absorbing layer 2 includes a metal film 2m, when bending the third region R3, which overlaps with the bending mechanism 7 when viewed from above, increases peel stress in the region near the third region R3, between the first region R1 supported by the inflexible first support substrate 5 and the second region R2 supported by the inflexible second support substrate 6. By forming slits SL1, SL2, SL1', and SL2' in the metal film 2m in these regions of high peel stress, the peel stress can be mitigated, thereby achieving a foldable display 1 with high impact resistance and bending resistance.

[0105] [Implementation Method 2]

[0106] Next, based on Figure 11 Embodiment 2 of the present invention will now be described. A foldable display 30 in this embodiment includes a frame 8, which includes a bending mechanism 8b, which differs from the foldable display 1 described in Embodiment 1. Other features are the same as those described in Embodiment 1. For ease of description, components having the same functions as those shown in the drawings of Embodiment 1 are denoted by the same reference numerals, and their descriptions are omitted.

[0107] Figure 11 This is a cross-sectional view showing a schematic configuration of a foldable display 30 according to a second embodiment.

[0108] Figure 11 The foldable display 30 shown includes a frame 8, which includes a bending mechanism 8b. The frame 8 includes a flat portion 8a connected to the first support substrate 5; a flat portion 8c connected to the second support substrate 6; and a bendable bending mechanism 8b. The bending mechanism 8b overlaps with the third region R3 when viewed from above. The material of the frame 8 is not particularly limited, but can be, for example, a metal material. If the frame 8 is made of metal, a configuration can be provided in which a plurality of holes are provided only in the portion corresponding to the bending mechanism 8b.

[0109] Furthermore, the first support substrate 5 and the flat portion 8a, or the second support substrate 6 and the flat portion 8c, can be fixed by laminating them with an adhesive layer or the like, or by fixing means such as screws. Furthermore, the first support substrate 5 and the second support substrate 6 can be fixed only at their outer edges using an adhesive layer or tape.

[0110] In the flexible display panel 4 of the foldable display 30 of this embodiment, which includes an impact-absorbing layer 2 and a display layer 3, and in which the impact-absorbing layer 2 includes a metal film 2m, when bending the third region R3, which overlaps with the bending mechanism 8b when viewed from above, increases peel stress in the region near the third region R3, between the first region R1 supported by the inflexible first support substrate 5 and the second region R2 supported by the inflexible second support substrate 6. Forming slits SL1 and SL2 in the metal film 2m in these regions of high peel stress mitigates the peel stress, enabling a foldable display 30 with high impact resistance and bending resistance.

[0111] [Implementation Method 3]

[0112] Next, based on Figure 12 and Figure 13 Embodiment 3 of the present invention will now be described. The flexible display panel 4e included in the foldable display of this embodiment includes an impact-absorbing layer 2' comprising a third adhesive layer 2c, a first polymer film 2p, a first adhesive layer 2a, a metal film 2m, a second adhesive layer 2b, and a second polymer film 2q. This differs from the foldable displays 1 and 30 described in Embodiments 1 and 2 in that only slits SL1' and SL2' are formed in the metal film 2m. The remainder is the same as described in Embodiments 1 and 2. For ease of description, components having the same functions as those shown in the drawings of Embodiments 1 and 2 are denoted by the same reference numerals, and their descriptions are omitted.

[0113] Figure 12 This is a cross-sectional view showing a schematic configuration of a flexible display panel 4e included in a foldable display according to a third embodiment.

[0114] like Figure 12 As shown, the flexible display panel 4e includes a shock absorbing layer 2' including a third adhesive layer 2c, a first polymer film 2p, a first adhesive layer 2a, a metal film 2m, a second adhesive layer 2b, and a second polymer film 2q.

[0115] In addition, the slits SL1' and SL2' formed only in the metal film 2m are Figure 2 The slits SL1' and SL2' shown in (b) have the same shape.

[0116] To enhance the impact absorption function of the impact-absorbing layer 2', it is preferred that one of the first polymer film 2p and the second polymer film 2q comprise at least one of polyimide, PET, PEN, COC, and aramid, and the other of the first polymer film 2p and the second polymer film 2q comprise at least one of PET, a urethane resin, a polyester resin, an acrylic resin, a polycarbonate resin, a polyimide, and a polyamide. In this embodiment, the first polymer film 2p is formed from any one of polyimide, PET, PEN, COC, and aramid, and the second polymer film 2q is formed from any one of PET, a urethane resin, a polyester resin, an acrylic resin, a polycarbonate resin, a polyimide, and a polyamide, but the present invention is not limited thereto. For example, the second polymer film 2q, which is positioned farther from the display layer 3 than the first polymer film 2p, may also be a foam such as acrylic foam or urethane foam.

[0117] Furthermore, in order to enhance the impact absorbing function of the impact absorbing layer 2 ′, it is preferable that the Young's modulus of the first polymer film 2 p and the Young's modulus of the second polymer film 2 q are different from each other.

[0118] Furthermore, to enhance the impact absorption function of the impact absorption layer 2', it is preferred that at least one of the first polymer film 2p and the second polymer film 2q has a thickness greater than that of the metal film 2m. Specifically, the first polymer film 2p may be thicker than the metal film 2m, while the second polymer film 2q may be thinner than the metal film 2m. Alternatively, the second polymer film 2q may be thicker than the metal film 2m, while the first polymer film 2p may be thinner than the metal film 2m. Furthermore, both the first polymer film 2p and the second polymer film 2q may be thicker than the metal film 2m. In this case, as long as the thickness of each of the first polymer film 2p and the second polymer film 2q is thicker than the metal film 2m, the thickness of the first polymer film 2p and the thickness of the second polymer film 2q may be the same or different.

[0119] Figure 13 (a) Figure 13 (b) Figure 13 (c) Figure 13 (d) and Figure 13 (e) is a diagram showing the inclusion of Figure 12 The illustrated flexible display panel 4e is a diagram showing an example of a method for manufacturing a foldable display according to a third embodiment.

[0120] In addition, the fixing process in the method for manufacturing the foldable display has been described in the first embodiment, so only the process of forming the flexible display panel 4e will be described here.

[0121] The process of forming the flexible display panel 4e includes: Figure 13 As shown in (a), the process of attaching the first polymer film 2p to the surface of one side of the display layer 3 via the third adhesive layer 2c; and Figure 13 As shown in (b), a process is performed to form slits SL1' and SL2' including a plurality of sub-slits SSL1 and SSL2 in each area of ​​the metal film roll 2mR corresponding to the flexible display panel (the area shown by the solid line in the figure). The slits SL1' and SL2' are formed by separating the plurality of sub-slits SSL1 and SSL2 by a distance S. In addition, in the process of forming the slits SL1' and SL2', the slits SL1' and SL2' can be formed by etching the metal film roll 2mR. Furthermore, the process includes: Figure 13 As shown in (b), the process of cutting out the respective regions corresponding to the flexible display panel from the metal film roll 2mR to obtain the metal film 2m being singulated; Figure 13 As shown in (c), the process of cutting out the respective regions corresponding to the flexible display panel from the second polymer film roll 2qR to obtain the second polymer film 2q being monolithic; and Figure 13 As shown in (d), the process of laminating the metal film 2m and the second polymer film 2q to be singulated is carried out via the second adhesive layer 2b. Figure 13 (d) and Figure 13 As shown in (e), a first adhesive layer 2a is formed on the monolithic metal film 2m of the second component BP including the monolithic metal film 2m, the second adhesive layer 2b and the monolithic second polymer film 2q, and the second component BP is bonded to the first component AP including the display layer 3, the third adhesive layer 2c and the first polymer film 2p through the first adhesive layer 2a.

[0122] also, Figure 13 The second polymer film roll 2qR shown in (c) is a roll including at least the second polymer film. For example, the second polymer film roll 2qR may be composed of only the second polymer film 2q, or may include the second polymer film 2q and the second adhesive layer 2b.

[0123] In this embodiment, the case where the first member AP and the second member BP are bonded together via the first adhesive layer 2a provided on the metal film 2m that is singulated on the second member BP is used as an example for description, but the present invention is not limited to this. For example, the first adhesive layer 2a may be provided on the first polymer film 2p of the first member AP, or on both the first polymer film 2p of the first member AP and the metal film 2m that is singulated on the second member BP. Alternatively, the first member AP and the second member BP may be bonded together via the first adhesive layer 2a provided in this manner.

[0124] In addition, in this embodiment, after the slits SL1' and SL2' are formed in the metal film roll 2mR, the respective regions corresponding to the flexible display panel are cut out from the metal film roll 2mR to obtain a monolithic metal film 2m, and the slits SL1' and SL2' are formed in the monolithic metal film 2m. However, the present invention is not limited to this. It is also possible to cut out the respective regions corresponding to the flexible display panel from the metal film roll 2mR to obtain a monolithic metal film 2m, and then form the slits SL1' and SL2' in the monolithic metal film 2m.

[0125] In addition, when the slits SL1' and SL2' are used, due to the presence of metal connection parts, Figure 13 In the process of bonding the monolithic metal film 2m and the monolithic second polymer film 2q via the second adhesive layer 2b shown in (d), they can be bonded with the size of the foldable display as the size of the monolithic film, and alignment adjustment becomes easy, which can eliminate misalignment and improve the yield.

[0126] In the flexible display panel 4e of the foldable display of this embodiment, which includes an impact-absorbing layer 2' and a display layer 3, and in which the impact-absorbing layer 2' includes a metal film 2m, when bending the third region R3, which overlaps with the bending mechanisms 7 and 8b when viewed from above, peel stress increases in the region near the third region R3, between the first region R1 supported by the inflexible first support substrate 5 and the second region R2 supported by the inflexible second support substrate 6. Forming slits SL1' and SL2' in the metal film 2m in these regions of high peel stress mitigates the peel stress, enabling a foldable display with high impact resistance and bending resistance.

[0127] [Implementation Method 4]

[0128] Next, based on Figure 14 、 Figure 15 as well as Figure 16 Embodiment 4 of the present invention will now be described. The flexible display panels 4f to 4h of the foldable display of this embodiment include an impact-absorbing layer 2' comprising a third adhesive layer 2c, a first polymer film 2p, a first adhesive layer 2a, a metal film 2m, a second adhesive layer 2b, and a second polymer film 2q. Slits SL1 and SL2 are formed in at least one of the first and second adhesive layers 2a and 2b, as well as in the metal film 2m. This differs from the foldable display described in Embodiment 3 in that the slits SL1 and SL2 are formed in the metal film 2m. The remainder is as described in Embodiments 1 to 3. For ease of description, components having the same functions as those shown in the drawings of Embodiments 1 to 3 are denoted by the same reference numerals, and their descriptions are omitted.

[0129] Figure 14 This is a cross-sectional view showing a schematic configuration of a flexible display panel 4f included in a foldable display according to a fourth embodiment.

[0130] like Figure 14 As shown, the flexible display panel 4f includes a shock absorbing layer 2' including a third adhesive layer 2c, a first polymer film 2p, a first adhesive layer 2a, a metal film 2m, a second adhesive layer 2b, and a second polymer film 2q. Figure 14 The slit SL1 shown is formed in the first adhesive layer 2a, the second adhesive layer 2b, and the metal film 2m. Figure 14 The slit SL2 shown is formed in the first adhesive layer 2a and the metal film 2m.

[0131] Figure 15 (a) and Figure 15 (b) is a cross-sectional view schematically showing another modified example of the flexible display panel that can be included in the foldable display of the fourth embodiment.

[0132] Figure 15 The flexible display panel 4g shown in (a) includes an impact absorbing layer 2' including a third adhesive layer 2c, a first polymer film 2p, a first adhesive layer 2a, a metal film 2m, a second adhesive layer 2b, and a second polymer film 2q. Figure 15 The slits SL1 and SL2 shown in (a) are formed in the first adhesive layer 2a and the metal film 2m.

[0133] Figure 15 The flexible display panel 4h shown in (b) includes an impact absorbing layer 2' including a third adhesive layer 2c, a first polymer film 2p, a first adhesive layer 2a, a metal film 2m, a second adhesive layer 2b, and a second polymer film 2q. Figure 15 The slits SL1 and SL2 shown in (b) are formed in the first adhesive layer 2a, the metal film 2m, and the second adhesive layer 2b.

[0134] Figure 16 (a) Figure 16 (b) Figure 16 (c) Figure 16 (d) Figure 16 (e), Figure 16 (f), Figure 16 (g) and Figure 16 (h) is a diagram showing the inclusion of Figure 14 and Figure 15 The diagram shows an example of a method for manufacturing a foldable display including the flexible display panels 4f to 4h.

[0135] In addition, the fixing step in the method for manufacturing the foldable display has been described in the first embodiment, so only the step of forming the flexible display panels 4f to 4h will be described here.

[0136] The process of forming the flexible display panels 4f-4h includes: Figure 16 As shown in (a), the process of attaching the first polymer film 2p to the surface of one side of the display layer 3 via the third adhesive layer 2c; Figure 16 (b) and Figure 16 As shown in (c), the process of forming a laminate roll BP'R, wherein the laminate roll BP'R is a roll in which a second polymer film 2q is adhered to one side of a roll of a metal film 2m via a second adhesive layer 2b, and a laminate roll in which a first adhesive layer 2a is formed on the other side of the roll of the metal film 2m. Figure 16 As shown in (d), in each region of the laminate roll BP'R corresponding to the flexible display panel, in at least one region of the first region R1 and the second region R2, the metal film 2m is cut into two parts, and slits SL1 and SL2 are formed in at least one adhesive layer of the second adhesive layer 2b and the first adhesive layer 2a and the metal film 2m; and a process of cutting out each region corresponding to the flexible display panel from the laminate roll BPR formed with the slits SL1 and SL2 to obtain a monolithic laminate BP. In addition, in the process of forming the slits SL1 and SL2, for example, the slits SL1 and SL2 can be formed from the laminate roll BP'R by punching or die cutting. In addition, in the process of forming the slits SL1 and SL2, the second polymer film 2q becomes a supporting substrate. In addition, the monolithic laminate BP can be obtained in the same manner, so the process of forming the slits SL1 and SL2 and the process of obtaining the monolithic laminate BP can also be performed by the same process. Figure 16 (e) is a diagram showing a laminated body BP that is singulated, in which slits SL1 are formed in the first adhesive layer 2a, the metal film 2m, and the second adhesive layer 2b, and slits SL2 are formed in the first adhesive layer 2a and the metal film 2m. Figure 16 (f) is a diagram showing a laminated body BP that is singulated and in which slits SL1 and SL2 are formed in the first adhesive layer 2a, the metal film 2m, and the second adhesive layer 2b. Figure 16 (g) is a diagram showing a laminated body BP formed into individual pieces with slits SL1 and SL2 formed in the first adhesive layer 2a and the metal film 2m. Figure 16 As shown in (h), the first polymer film 2p of the first member AP including the display layer 3, the third adhesive layer 2c and the first polymer film 2p is Figure 16 The process of laminating the laminated body BP shown in (e) through the first adhesive layer 2a is shown. Figure 16 The case where the single-piece laminated body BP shown in (e) is bonded to the first member AP is described as an example, but is not limited to this. Figure 16 (f) or Figure 16The individualized laminated body BP shown in (g) is bonded to the first member AP.

[0137] By using the above-mentioned method for manufacturing a foldable display, in the process of bonding the first polymer film 2p of the first component AP to the monolithic stack (second component) BP via the first adhesive layer 2a, the bonding can be performed with the size of the monolithic size and the size of the foldable display, alignment adjustment becomes easy, misalignment can be eliminated, and the yield rate is improved.

[0138] Furthermore, in the step of forming the slits SL1 and SL2 in the above-mentioned method of manufacturing a foldable display, the slits SL1 and SL2 are formed from the laminate roll BP'R by punching or die-cutting. Therefore, the foldable display can be manufactured at a lower cost than when the slits are formed by etching.

[0139] In the flexible display panels 4f-4h of the foldable display of this embodiment, which include an impact-absorbing layer 2' and a display layer 3, and in which the impact-absorbing layer 2' includes a metal film 2m, bending the third region R3, which overlaps with the bending mechanisms 7 and 8b when viewed from above, increases peel stress in the region near the third region R3, between the first region R1 supported by the inflexible first support substrate 5 and the second region R2 supported by the inflexible second support substrate 6. Forming slits SL1 and SL2 in the metal film 2m in these regions of high peel stress mitigates the peel stress, enabling a foldable display with high impact resistance and bending resistance.

[0140] [Implementation method 5]

[0141] Next, based on Figure 17 、 Figure 18 as well as Figure 19 Embodiment 5 of the present invention will now be described. The flexible display panel 4i of the foldable display of this embodiment includes an impact absorbing layer 2' comprising a third adhesive layer 2c, a first polymer film 2p, a first adhesive layer 2a, a metal film 2m, a second adhesive layer 2b, and a second polymer film 2q. Slits SL1 and SL2 are formed in the first and second adhesive layers 2a, 2b, the metal film 2m, and at least one of the first and second polymer films 2p, 2q, differing from the foldable displays described in Embodiments 3 and 4. The remainder is as described in Embodiments 1 to 4. For ease of description, components having the same functions as those shown in the drawings of Embodiments 1 to 4 are denoted by the same reference numerals, and their descriptions are omitted.

[0142] Figure 17 This is a cross-sectional view showing a schematic configuration of a flexible display panel 4i included in a foldable display according to a fifth embodiment.

[0143] like Figure 17 As shown, the flexible display panel 4i of the foldable display of this embodiment includes an impact absorbing layer 2' including a third adhesive layer 2c, a first polymer film 2p, a first adhesive layer 2a, a metal film 2m, a second adhesive layer 2b, and a second polymer film 2q. The case where slits SL1 and SL2 are formed in the first and second adhesive layers 2a and 2b, the metal film 2m, and the second polymer film 2q is described as an example, but the present invention is not limited to this. For example, slits SL1 and SL2 may be formed in at least one of the first and second adhesive layers 2a and 2b, the metal film 2m, and the first and second polymer films 2p and 2q.

[0144] Figure 18 (a) Figure 18 (b) Figure 18 (c) and Figure 18 (d) shows that Figure 17 A diagram showing an example of a method for manufacturing a foldable display using a flexible display panel 4i is shown.

[0145] In addition, the fixing process in the method for manufacturing the foldable display has been described in the first embodiment, so only the process of forming the flexible display panel 4i will be described here.

[0146] The process of forming the flexible display panel 4i includes: Figure 18 As shown in (a), the process of attaching the first polymer film 2p to the surface of one side of the display layer 3 via the third adhesive layer 2c; and Figure 18 As shown in (b), the process of forming a laminate roll BP'R is a laminate roll in which a second polymer film 2q is adhered to one side of a roll of a metal film 2m via a second adhesive layer 2b, and a first adhesive layer 2a is formed on the other side of the roll of the metal film 2m. Figure 18 As shown in (b), in each region ( Figure 18 In the area shown by the solid line in (b), the stack roll BP'R is cut into a plurality of stacks BP1', BP2', BP3', so that the total area of ​​the plurality of stacks BP1', BP2', BP3' obtained by cutting is larger than the area of ​​the flexible display panel ( Figure 18 That is, in the process of cutting the laminate roll BP'R into a plurality of laminates BP1', BP2', BP3', the width of the slits SL1 and SL2 to be formed later ( Figure 18(c) The width of the slits SL1 and SL2 in the vertical direction is greater than the total area of ​​the flexible display panel ( Figure 18 In addition, in the process of cutting the laminate roll BP'R into a plurality of laminates BP1', BP2', BP3', a plurality of laminates BP1', BP2', BP3' are obtained from the laminate roll BP'R by die cutting. And it includes: Figure 18 (c) and Figure 18 As shown in (d), a process is performed in which a plurality of stacked bodies BP1', BP2', BP3' are adhered to the first polymer film 2p of the first component AP including the display layer 3, the third adhesive layer 2c and the first polymer film 2p via the first adhesive layer 2a, and the distance between the plurality of stacked bodies BP1', BP2', BP3' is separated to form slits SL1, SL2.

[0147] By using the above-described method for manufacturing a foldable display, the flexible display panel 4i can be formed by combining die cutting and lamination, thereby making it relatively easy to manufacture the foldable display. Furthermore, the equipment investment cost caused by the increase in steps associated with manufacturing the impact absorbing layer 2' can be reduced.

[0148] Figure 19 (a) Figure 19 (b) Figure 19 (c) Figure 19 (d) Figure 19 (e), Figure 19 (f), Figure 19 (g) and Figure 19 (h) is a diagram showing the inclusion of Figure 17 FIG. 4 is a diagram showing another example of a method for manufacturing a foldable display using a flexible display panel 4i.

[0149] In addition, the fixing process in the method for manufacturing the foldable display has been described in the first embodiment, so only the process of forming the flexible display panel 4i will be described here.

[0150] like Figure 19 As shown in (a), the process of forming the flexible display panel 4i includes: a process of attaching the first polymer film 2p to the surface of one side of the display layer 3 via the third adhesive layer 2c; and Figure 19 (b) and Figure 19As shown in (c), the process of forming a laminate roll BP"R is a laminate roll in which a second polymer film 2q is bonded to a surface of a roll of a metal film 2m via a second adhesive layer 2b, a first adhesive layer 2a is formed on a surface of the other side of the roll of the metal film 2m, and a roll of the second polymer film 2q is bonded to a substrate 10 via a fourth adhesive layer 11 having weaker adhesion than the first adhesive layer 2a, the second adhesive layer 2b, and the third adhesive layer 2c. And it includes: Figure 19 As shown in (d), in each region ( Figure 19 (d) (the area indicated by the solid line), in at least one of the first region R1 and the second region R2, the metal film 2m is cut into two parts, and slits SL1 and SL2 are formed in at least the second adhesive layer 2b and the first adhesive layer 2a, the metal film 2m, and the second polymer film 2q; and Figure 19 As shown in (d), it is a step of cutting out individual regions corresponding to the flexible display panel from the laminated body roll BP"R in which the slits SL1 and SL2 are formed, thereby obtaining individual laminated bodies BP". Figure 19 The single-piece laminated body BP" shown in (e) is a diagram showing a situation where slits SL1 and SL2 are formed in the second adhesive layer 2b and the first adhesive layer 2a, the metal film 2m, and the second polymer film 2q. Figure 19 The single-piece laminated body BP" shown in (f) is a diagram showing a state where slits SL1 and SL2 are formed in the second adhesive layer 2b and the first adhesive layer 2a, the metal film 2m, the second polymer film 2q, and a portion of the fourth adhesive layer 11. In addition, in the process of forming the above-mentioned slits SL1 and SL2, the substrate 10 serves as a supporting substrate. In addition, in the process of forming the above-mentioned slits SL1 and SL2, as shown in FIG. Figure 19 As shown in (f), slits SL1 and SL2 can also be formed in a portion of the fourth adhesive layer 11. Therefore, by having the substrate 10 and the fourth adhesive layer 11, the process margin of the slit process can be expanded. Figure 19 As shown in (g), the first polymer film 2p of the first component AP including the display layer 3, the third adhesive layer 2c and the first polymer film 2p is attached to the single-piece laminate (second component) BP" via the first adhesive layer 2a; and Figure 19 As shown in (h), the base material 10 and the fourth adhesive layer 11 are peeled off from the second polymer film 2q of the individualized laminated body BP".

[0151] By using the above-mentioned method for manufacturing a foldable display, the process margin of the slit process can be increased, and the yield rate can be improved.

[0152] 〔Summarize〕

[0153] [Scheme 1]

[0154] A foldable display comprising:

[0155] A flexible display panel comprising: an impact absorbing layer comprising a metal film; and a display layer provided on one surface of the impact absorbing layer;

[0156] a first region, a second region, and a third region, which are regions of the flexible display panel, wherein the third region is located between the first region and the second region;

[0157] a first supporting substrate having inflexibility and supporting the first region from the impact absorbing layer side;

[0158] a second supporting substrate having inflexibility and supporting the second region from the impact absorbing layer side;

[0159] a bending mechanism connected to the first supporting substrate and the second supporting substrate and overlapping with the third region in a plan view; and

[0160] A slit is provided in the metal film at at least one of a first position and a second position, wherein the first position is a position in the first region where the shortest distance to the third region is closer than the shortest distance to the end of the first region on the side opposite to the third region, and the second position is a position in the second region where the shortest distance to the third region is closer than the shortest distance to the end of the second region on the side opposite to the third region.

[0161] [Scheme 2]

[0162] The foldable display according to solution 1, wherein:

[0163] The impact absorbing layer further includes at least one adhesive layer of a first adhesive layer provided on one surface of the metal film and a second adhesive layer provided on the other surface of the metal film.

[0164] The slit is provided in at least one of the first adhesive layer and the second adhesive layer and in the metal film.

[0165] [Scheme 3]

[0166] The foldable display according to solution 1, wherein:

[0167] The impact absorbing layer further includes: a first polymer film provided on one side of the metal film via a first adhesive layer; and a second polymer film provided on the other side of the metal film via a second adhesive layer.

[0168] The slit is provided in the first adhesive layer, the second adhesive layer, the metal film, and at least one polymer film among the first polymer film and the second polymer film.

[0169] [Scheme 4]

[0170] The foldable display according to solution 3, wherein:

[0171] One of the first polymer film and the second polymer film comprises at least one of polyimide, PET, PEN, COC, and aramid.

[0172] The other of the first polymer film and the second polymer film includes at least one of PET, a urethane resin, a polyester resin, an acrylic resin, and a polycarbonate resin.

[0173] [Scheme 5]

[0174] The foldable display according to any one of solutions 1 to 3, wherein:

[0175] The impact absorbing layer further includes: a first polymer film provided on one side of the metal film via a first adhesive layer; and a second polymer film provided on the other side of the metal film via a second adhesive layer.

[0176] The second polymer film is a foamed body arranged farther away from the display layer than the first polymer film.

[0177] [Scheme 6]

[0178] The foldable display according to any one of solutions 3 to 5, wherein:

[0179] The Young's modulus of the first polymer film is different from the Young's modulus of the second polymer film.

[0180] [Scheme 7]

[0181] The foldable display according to any one of solutions 3 to 6, wherein:

[0182] The thickness of at least one of the first polymer film and the second polymer film is greater than the thickness of the metal film.

[0183] [Scheme 8]

[0184] The foldable display according to any one of solutions 1 to 7, wherein:

[0185] The slit is formed in a straight line along the curved center of the third region extending in a straight line.

[0186] [Scheme 9]

[0187] The foldable display according to any one of solutions 1 to 8, wherein:

[0188] The slit divides the metal film into two parts in at least one of the first region and the second region.

[0189] [Scheme 10]

[0190] The foldable display according to any one of solutions 1 to 8, wherein:

[0191] The slit includes a plurality of sub-slits,

[0192] The plurality of sub-slits are formed separately from each other.

[0193] [Scheme 11]

[0194] The foldable display according to any one of solutions 1 to 10, wherein:

[0195] The width of the slit in a direction perpendicular to the center of curvature of the third region extending in a straight line is 500 μm or less.

[0196] [Scheme 12]

[0197] The foldable display according to any one of solutions 1 to 11, wherein:

[0198] The first region and the second region are each in a non-bent state,

[0199] The third region is in a first curved state in which a curvature radius of the display layer is smaller than a curvature radius of the impact absorbing layer.

[0200] The bent shape of the flexible display panel is a U shape.

[0201] [Scheme 13]

[0202] The foldable display according to solution 12, wherein:

[0203] The bending radius of the impact absorbing layer in the third region is R,

[0204] The slit is provided in a region where the shortest distance from the curvature center of the third region extending in a straight line is not less than π×R×0.5 and not more than π×R×1.5.

[0205] [Scheme 14]

[0206] The foldable display according to solution 13, wherein:

[0207] The slit is provided in a region where the shortest distance from the curvature center of the third region extending in a straight line is not less than π×R×0.5 and not more than π×R.

[0208] [Scheme 15]

[0209] The foldable display according to any one of solutions 1 to 11, wherein:

[0210] The first region and the second region are each in a non-bent state,

[0211] A portion of the third region extending linearly from a curvature center of the third region is in a first curvature state in which a curvature radius of the display layer is smaller than a curvature radius of the impact absorbing layer, and a remaining portion is in a second curvature state in which a curvature radius of the display layer is larger than a curvature radius of the impact absorbing layer.

[0212] The bent shape of the flexible display panel is a drop shape.

[0213] [Scheme 16]

[0214] The foldable display according to claim 15, wherein:

[0215] The slit is provided so as to be in contact with the region of the third region in the second bent state.

[0216] [Scheme 17]

[0217] The foldable display according to any one of solutions 1 to 16, wherein:

[0218] The display layer further includes a sealing layer.

[0219] [Scheme 18]

[0220] The foldable display according to any one of solutions 1 to 17, wherein:

[0221] The metal film includes at least one of stainless steel, aluminum, titanium, and copper.

[0222] [Scheme 19]

[0223] The foldable display according to any one of solutions 1 to 18, wherein:

[0224] The thickness of the metal film is greater than or equal to 10 μm and less than or equal to 100 μm.

[0225] [Scheme 20]

[0226] A method for manufacturing a foldable display, comprising:

[0227] a step of forming a flexible display panel including a display layer on a side of an impact absorbing layer including a metal film; and

[0228] a fixing step of fixing the first region of the flexible display panel to a non-flexible first supporting substrate from the impact absorbing layer side, fixing the second region of the flexible display panel to a non-flexible second supporting substrate from the impact absorbing layer side, and making the third region of the flexible display panel located between the first region and the second region overlap with a bending mechanism connected to the first supporting substrate and the second supporting substrate in a plan view;

[0229] The process of forming the flexible display panel also includes a process of setting a slit in the metal film at at least one of a first position and a second position, wherein the first position is a position in the first region where the shortest distance to the third region is closer than the shortest distance to the end of the first region on the side opposite to the third region, and the second position is a position in the second region where the shortest distance to the third region is closer than the shortest distance to the end of the second region on the side opposite to the third region.

[0230] [Scheme 21]

[0231] The method for manufacturing a foldable display according to solution 20, wherein:

[0232] The process of forming the flexible display panel includes:

[0233] a step of laminating the first polymer film to one surface of the display layer via a third adhesive layer;

[0234] forming the slits including a plurality of separate sub-slits in respective regions of the roll of metal film corresponding to the flexible display panel;

[0235] a step of cutting each region corresponding to the flexible display panel from the roll of the metal film to obtain individual pieces of the metal film;

[0236] a step of cutting out individual regions corresponding to the flexible display panel from a roll including at least the second polymer film to obtain individual pieces of the second polymer film;

[0237] a step of laminating the singulated metal film and the singulated second polymer film via a second adhesive layer; and

[0238] A process for bonding a first component comprising the display layer, the third adhesive layer and the first polymer film to a second component comprising the monolithic metal film, the second adhesive layer and the monolithic second polymer film via a first adhesive layer provided on at least one of the first polymer film and the monolithic metal film.

[0239] [Scheme 22]

[0240] The method for manufacturing a foldable display according to solution 20, wherein:

[0241] The process of forming the flexible display panel includes:

[0242] a step of laminating the first polymer film to one surface of the display layer via a third adhesive layer;

[0243] a step of cutting each region corresponding to the flexible display panel from a roll of the metal film to obtain individual pieces of the metal film;

[0244] forming the slits in the singulated metal film, each of which includes a plurality of sub-slits and is separated from the other;

[0245] a step of cutting out individual regions corresponding to the flexible display panel from a roll including at least the second polymer film to obtain individual pieces of the second polymer film;

[0246] a step of laminating the singulated metal film and the singulated second polymer film via a second adhesive layer; and

[0247] A process for bonding a first component comprising the display layer, the third adhesive layer and the first polymer film to a second component comprising the monolithic metal film, the second adhesive layer and the monolithic second polymer film via a first adhesive layer provided on at least one of the first polymer film and the monolithic metal film.

[0248] [Scheme 23]

[0249] The method for manufacturing a foldable display according to solution 20, wherein:

[0250] The process of forming the flexible display panel includes:

[0251] a step of laminating the first polymer film to one surface of the display layer via a third adhesive layer;

[0252] a step of forming a laminate roll, wherein the laminate roll includes a second polymer film laminated to one surface of a metal film roll via a second adhesive layer, and a first adhesive layer formed on the other surface of the metal film roll;

[0253] A step of cutting the metal film into two parts in at least one of the first and second regions in each region of the laminate roll corresponding to the flexible display panel, and forming the slit in at least one of the second adhesive layer and the first adhesive layer and in the metal film;

[0254] A step of cutting out individual regions corresponding to the flexible display panel from the laminate roll to obtain individual laminates; and

[0255] a step of laminating the first polymer film of a first member including the display layer, the third adhesive layer, and the first polymer film to the individualized laminated body via the first adhesive layer.

[0256] [Scheme 24]

[0257] The method for manufacturing a foldable display according to solution 20, wherein:

[0258] The process of forming the flexible display panel includes:

[0259] a step of laminating the first polymer film to one surface of the display layer via a third adhesive layer;

[0260] a step of forming a laminate roll, wherein the laminate roll includes a second polymer film laminated to one surface of a metal film roll via a second adhesive layer, and a first adhesive layer formed on the other surface of the metal film roll;

[0261] a step of cutting the laminate roll into a plurality of laminates at respective regions of the laminate roll corresponding to the flexible display panel so that the total area of ​​the plurality of laminates obtained by cutting is smaller than the area of ​​the flexible display panel; and

[0262] The step of laminating the plurality of laminates to the first polymer film of the first member including the display layer, the third adhesive layer, and the first polymer film via the first adhesive layer, and separating the plurality of laminates to form the slits.

[0263] [Scheme 25]

[0264] The method for manufacturing a foldable display according to solution 20, wherein:

[0265] The process of forming the flexible display panel includes:

[0266] a step of laminating the first polymer film to one surface of the display layer via a third adhesive layer;

[0267] a step of forming a laminate roll, wherein the laminate roll comprises a second polymer film laminated to one surface of a metal film roll via a second adhesive layer, a first adhesive layer formed on the other surface of the metal film roll, and the second polymer film roll laminated to a substrate via a fourth adhesive layer having weaker adhesion than the first adhesive layer, the second adhesive layer, and the third adhesive layer;

[0268] A step of cutting the metal film into two parts in at least one of the first and second regions of each region of the laminate roll corresponding to the flexible display panel, and forming the slits in at least the second adhesive layer and the first adhesive layer, the metal film, and the second polymer film;

[0269] a step of cutting out individual regions corresponding to the flexible display panel from the laminate roll to obtain individual laminates;

[0270] a step of laminating the first polymer film of a first member including the display layer, the third adhesive layer, and the first polymer film to the individualized laminated body via the first adhesive layer; and

[0271] a step of peeling the substrate and the fourth adhesive layer from the second polymer film of the individualized laminate.

[0272] [Additional Notes]

[0273] The present invention is not limited to the above-described embodiments. Various modifications can be made within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Moreover, by combining the technical means disclosed in the various embodiments, new technical features can be formed.

[0274] Industrial applicability

[0275] The present invention can be used in a foldable display and a method for manufacturing the foldable display.

[0276] Description of Reference Numerals

[0277] 1.30 Foldable Display

[0278] 2, 2', 120, 120' impact absorbing layer

[0279] 2m, 112m metal film

[0280] 2mR metal film roll

[0281] 2a 1st adhesive layer

[0282] 2b Second adhesive layer

[0283] 2p 1st polymer film

[0284] 2q Second polymer film

[0285] 2qR Second Polymer Film Volume

[0286] 2c Third adhesive layer

[0287] 3 Display Layer

[0288] 4. 4' flexible display panel

[0289] 4a~4i Flexible display panels

[0290] 5. First supporting substrate

[0291] 6 Second supporting substrate

[0292] 7, 8b bending mechanism

[0293] 8 Frame

[0294] 10. Substrate

[0295] 11, 121a 4th adhesive layer

[0296] SL1, SL2, SL1', SL2' slits

[0297] R1 Area 1

[0298] R2 Area 2

[0299] R3 Area 3

[0300] R3a Part of the third region in the first bending state

[0301] R3b, R3b' Part of the third region in the second bending state

[0302] GC Bending Center

[0303] R, r bending radius

[0304] AP 1st component

[0305] BP second member (single-piece laminate)

[0306] BP'R laminate roll

[0307] BPR laminated roll with slits

[0308] BP1', BP2', BP3' multiple stacks

[0309] BP"R laminate roll

[0310] BP': Single-piece laminate (second member)

[0311] SL1W, SL2W are the widths of the slits in a direction perpendicular to the center of the straight-line bending.

Claims

1. A foldable display, characterized in that: Include: A flexible display panel comprising: an impact absorbing layer comprising a metal film; and a display layer provided on one surface of the impact absorbing layer; a first region, a second region, and a third region, which are regions of the flexible display panel, wherein the third region is located between the first region and the second region; a first supporting substrate having inflexibility and supporting the first region from the impact absorbing layer side; a second supporting substrate having inflexibility and supporting the second region from the impact absorbing layer side; a bending mechanism connected to the first supporting substrate and the second supporting substrate and overlapping with the third region in a plan view; as well as A slit is provided in the metal film at at least one of a first position and a second position, wherein the first position is a position in the first region where the shortest distance to the third region is closer than the shortest distance to the end of the first region on the side opposite to the third region, and the second position is a position in the second region where the shortest distance to the third region is closer than the shortest distance to the end of the second region on the side opposite to the third region.

2. The foldable display according to claim 1, wherein: The impact absorbing layer further includes at least one adhesive layer of a first adhesive layer provided on one surface of the metal film and a second adhesive layer provided on the other surface of the metal film. The slit is provided in at least one of the first adhesive layer and the second adhesive layer and in the metal film.

3. The foldable display according to claim 1, wherein: The impact absorbing layer further includes: a first polymer film provided on one side of the metal film via a first adhesive layer; and a second polymer film provided on the other side of the metal film via a second adhesive layer. The slit is provided in the first adhesive layer, the second adhesive layer, the metal film, and at least one polymer film among the first polymer film and the second polymer film.

4. The foldable display according to claim 3, wherein: One of the first polymer film and the second polymer film comprises at least one of polyimide, PET, PEN, COC, and aramid. The other of the first polymer film and the second polymer film includes at least one of PET, a urethane resin, a polyester resin, an acrylic resin, and a polycarbonate resin.

5. The foldable display according to any one of claims 1 to 3, wherein: The impact absorbing layer further includes: a first polymer film provided on one side of the metal film via a first adhesive layer; and a second polymer film provided on the other side of the metal film via a second adhesive layer. The second polymer film is a foamed body arranged farther away from the display layer than the first polymer film.

6. The foldable display according to any one of claims 3 to 5, wherein: The Young's modulus of the first polymer film is different from the Young's modulus of the second polymer film.

7. The foldable display according to any one of claims 3 to 6, wherein: The thickness of at least one of the first polymer film and the second polymer film is greater than the thickness of the metal film.

8. The foldable display according to any one of claims 1 to 7, wherein: The slit is formed in a straight line along the curved center of the third region extending in a straight line.

9. The foldable display according to any one of claims 1 to 8, wherein: The slit divides the metal film into two parts in at least one of the first region and the second region.

10. The foldable display according to any one of claims 1 to 8, wherein: The slit includes a plurality of sub-slits, The plurality of sub-slits are formed separately from each other.

11. The foldable display according to any one of claims 1 to 10, wherein: The width of the slit in a direction perpendicular to the center of curvature of the third region extending in a straight line is 500 μm or less.

12. The foldable display according to any one of claims 1 to 11, wherein: The first region and the second region are each in a non-bent state, The third region is in a first curved state in which a curvature radius of the display layer is smaller than a curvature radius of the impact absorbing layer. The bent shape of the flexible display panel is a U shape.

13. The foldable display according to claim 12, wherein: The bending radius of the impact absorbing layer in the third region is R, The slit is provided in a region where the shortest distance from the curvature center of the third region extending in a straight line is not less than π×R×0.5 and not more than π×R×1.

5.

14. The foldable display according to claim 13, wherein: The slit is provided in a region where the shortest distance from the curvature center of the third region extending in a straight line is not less than π×R×0.5 and not more than π×R.

15. The foldable display according to any one of claims 1 to 11, wherein: The first region and the second region are each in a non-bent state, A portion of the third region extending linearly from a curvature center of the third region is in a first curvature state in which a curvature radius of the display layer is smaller than a curvature radius of the impact absorbing layer, and a remaining portion is in a second curvature state in which a curvature radius of the display layer is larger than a curvature radius of the impact absorbing layer. The bent shape of the flexible display panel is a drop shape.

16. The foldable display according to claim 15, wherein: The slit is provided so as to be in contact with the region of the third region in the second bent state.

17. The foldable display according to any one of claims 1 to 16, wherein: The display layer further includes a sealing layer.

18. The foldable display according to any one of claims 1 to 17, wherein: The metal film includes at least one of stainless steel, aluminum, titanium, and copper.

19. The foldable display according to any one of claims 1 to 18, wherein: The thickness of the metal film is not less than 10 μm and not more than 100 μm.

20. A method for manufacturing a foldable display, characterized in that: Include: a step of forming a flexible display panel including a display layer on a side of an impact absorbing layer including a metal film; and a fixing step of fixing the first region of the flexible display panel to a non-flexible first supporting substrate from the impact absorbing layer side, fixing the second region of the flexible display panel to a non-flexible second supporting substrate from the impact absorbing layer side, and making the third region of the flexible display panel located between the first region and the second region overlap with a bending mechanism connected to the first supporting substrate and the second supporting substrate in a plan view; The process of forming the flexible display panel also includes a process of setting a slit in the metal film at at least one of a first position and a second position, wherein the first position is a position in the first region where the shortest distance to the third region is closer than the shortest distance to the end of the first region on the side opposite to the third region, and the second position is a position in the second region where the shortest distance to the third region is closer than the shortest distance to the end of the second region on the side opposite to the third region.

21. The method for manufacturing a foldable display according to claim 20, wherein: The process of forming the flexible display panel includes: a step of laminating the first polymer film to one surface of the display layer via a third adhesive layer; forming the slits including a plurality of separate sub-slits in respective regions of the roll of metal film corresponding to the flexible display panel; a step of cutting each region corresponding to the flexible display panel from the roll of the metal film to obtain individual pieces of the metal film; a step of cutting out individual regions corresponding to the flexible display panel from a roll including at least a second polymer film to obtain individualized second polymer films; a step of laminating the singulated metal film and the singulated second polymer film via a second adhesive layer; as well as A process for bonding a first component comprising the display layer, the third adhesive layer and the first polymer film to a second component comprising the monolithic metal film, the second adhesive layer and the monolithic second polymer film via a first adhesive layer provided on at least one of the first polymer film and the monolithic metal film.

22. The method for manufacturing a foldable display according to claim 20, wherein: The process of forming the flexible display panel includes: a step of laminating the first polymer film to one surface of the display layer via a third adhesive layer; a step of cutting regions corresponding to the flexible display panel from a roll of the metal film to obtain individual pieces of the metal film; forming the slits in the singulated metal film, each of which includes a plurality of sub-slits and is separated from the other; a step of cutting out individual regions corresponding to the flexible display panel from a roll including at least the second polymer film to obtain individual pieces of the second polymer film; a step of laminating the singulated metal film and the singulated second polymer film via a second adhesive layer; as well as A process for bonding a first component comprising the display layer, the third adhesive layer and the first polymer film to a second component comprising the monolithic metal film, the second adhesive layer and the monolithic second polymer film via a first adhesive layer provided on at least one of the first polymer film and the monolithic metal film.

23. The method for manufacturing a foldable display according to claim 20, wherein: The process of forming the flexible display panel includes: a step of laminating the first polymer film to one surface of the display layer via a third adhesive layer; a step of forming a laminate roll, wherein the laminate roll includes a second polymer film laminated to one surface of a metal film roll via a second adhesive layer, and a first adhesive layer formed on the other surface of the metal film roll; A step of cutting the metal film into two parts in at least one of the first and second regions in each region of the laminate roll corresponding to the flexible display panel, and forming the slit in at least one of the second adhesive layer and the first adhesive layer and in the metal film; a step of cutting out individual regions corresponding to the flexible display panel from the laminate roll to obtain individual laminates; as well as a step of laminating the first polymer film of a first member including the display layer, the third adhesive layer, and the first polymer film to the individualized laminated body via the first adhesive layer.

24. The method for manufacturing a foldable display according to claim 20, wherein: The process of forming the flexible display panel includes: a step of laminating the first polymer film to one surface of the display layer via a third adhesive layer; a step of forming a laminate roll, wherein the laminate roll includes a second polymer film laminated to one surface of a metal film roll via a second adhesive layer, and a first adhesive layer formed on the other surface of the metal film roll; a step of cutting the laminate roll into a plurality of laminates at respective regions of the laminate roll corresponding to the flexible display panel so that the total area of ​​the plurality of laminates obtained by cutting is smaller than the area of ​​the flexible display panel; as well as The step of laminating the plurality of laminates to the first polymer film of the first member including the display layer, the third adhesive layer, and the first polymer film via the first adhesive layer, and separating the plurality of laminates to form the slits.

25. The method for manufacturing a foldable display according to claim 20, wherein: The process of forming the flexible display panel includes: a step of laminating the first polymer film to one surface of the display layer via a third adhesive layer; a step of forming a laminate roll, wherein the laminate roll comprises a second polymer film laminated to one surface of a metal film roll via a second adhesive layer, a first adhesive layer formed on the other surface of the metal film roll, and the second polymer film roll laminated to a substrate via a fourth adhesive layer having weaker adhesion than the first adhesive layer, the second adhesive layer, and the third adhesive layer; A step of cutting the metal film into two parts in at least one of the first and second regions of each region of the laminate roll corresponding to the flexible display panel, and forming the slits in at least the second adhesive layer and the first adhesive layer, the metal film, and the second polymer film; a step of cutting out individual regions corresponding to the flexible display panel from the laminate roll to obtain individual laminates; a step of laminating the first polymer film of a first member including the display layer, the third adhesive layer, and the first polymer film to the individualized laminated body via the first adhesive layer; and a step of peeling the substrate and the fourth adhesive layer from the second polymer film of the individualized laminate.

Images