Silicone-laminated metal support for a foldable display, and foldable display

Abstract

The present disclosure provides a silicone-laminated metal substrate (20) for a foldable display (46). The silicone-laminated metal substrate (20) includes a metal sheet (22) having a plurality of through-holes (34) and a cured silicone (24) bonded to at least one side of the metal sheet (22). The through-holes (34) are formed to allow the silicone-laminated metal substrate (20) to bend, and are filled with the cured silicone (24). The silicone-laminated metal substrate (20) can provide a flexible display (46) with good, repeatable bending properties and good tactile aesthetics (e.g., good tactile feel).

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to and all benefits of U.S. Provisional Patent Application No. 63 / 442,431, filed January 31, 2023, the contents of which are incorporated herein by reference.

[0002] FIELD OF THE INVENTION The present invention relates to a silicone-laminated metal support for a foldable display device, and to a foldable display. [Background technology]

[0003] A flexible display generally comprises a flexible support, an organic light-emitting diode (OLED) element, and a passivation element, and is capable of withstanding bending. Flexible supports are exemplified by plastic supports made of organic materials, supports having a structure in which organic and inorganic materials are laminated, and metal supports such as thin stainless steel or aluminum. For example, Patent Document 1 discloses a flexible display, in which the flexible support can be made of stainless steel (SUS), magnesium (Mg), rubber, graphene, Teflon, PDMS (polydimethylsiloxane), urethane, or PVC (polyvinyl chloride) film. Patent Document 2 discloses a silicone support for a flexible display, in which the silicone support is formed from a cured silicone.

[0004] Recently, flexible displays have been designed with structures that can withstand a specific bending radius. Using current structures, the folding and rotating sections can be easily resolved and improved. However, improving pen touch and pen and ball drop performance remains difficult. Current foldable display structures employ a single silicone support to control mechanical stress changes during bending or folding. While the silicone support can help release mechanical stress in the bending area, the single silicone support is too soft to protect against external impacts from pen and finger touch.

[0005] Patent Document 3 discloses a foldable support for a foldable display, comprising a metal layer, a first buffer layer, and a second buffer layer, the first buffer layer and the second buffer layer being laminated on both sides of the metal layer in the thickness direction, and the metal layer of the foldable support comprising a bending zone and a non-bending zone. Patent Document 4 discloses a metal support for a foldable display device, wherein the support member comprises a plurality of openings formed in a foldable region, the openings comprising openings arranged in a first parallel direction and openings arranged at positions shifted in a second direction perpendicular to the first direction.

[0006] However, these flexible supports have poor bending ability and tend not to return to their original state after repeated bending or prolonged static bending.

[0007] Prior art documents Patent documents Patent Document 1: U.S. Patent Application Publication No. 2015 / 0021570(A1) Patent Document 2: International Publication No. 2019 / 217672(A1) Patent Document 3: China Utility Model Publication No. 212411479(U) Patent Document 4: U.S. Patent Application Publication No. 2020 / 0411777(A1) Summary of the Invention

[0008] technical challenges It is an object of the present invention to provide a silicone-laminated metal substrate for a foldable display, which can provide a foldable display with good repeatable bending properties (e.g., improved durability and less tendency to be damaged or broken during long-term practical use) and good tactile aesthetics (e.g., having a good or pleasant tactile feel). Another object of the present invention is to provide a foldable display with good repeatable bending properties and good tactile aesthetics. [Means for solving the problem]

[0009] The silicone-laminated metal support for a foldable display of the present invention comprises a metal sheet having a plurality of through holes and a cured silicone material adhered to at least one side of the metal sheet, the through holes being formed to allow the silicone-laminated metal support to bend and being filled with the cured silicone material.

[0010] In various embodiments, the metal sheet comprises or is made of copper (Cu), aluminum (Al), titanium (Ti), stainless steel (SUS), nickel-titanium (Ni—Ti), nickel-aluminum (Ni—Al), copper-zinc-nickel (Cu—Zn—Ni), copper-aluminum-nickel (Cu—Al—Ni), copper-aluminum-manganese (Cu—Al—Mn), titanium-nickel-copper-molybdenum (Ti—Ni—Cu—Mo), cobalt-nickel-gallium:iron (Co—Ni—Ga:Fe), silver-nickel (Ag—Ni), gold-cadmium (Au—Cd), iron-platinum (Fe—Pt), iron-nickel (Fe—Ni), or indium-cadmium (In—Cd).

[0011] In various embodiments, the thickness of the metal sheet ranges from 1 to 500 μm.

[0012] In various embodiments, the through holes are aligned in a first direction parallel to the metal sheet and shifted in a second direction perpendicular to the first direction.

[0013] In various embodiments, the through-holes are rectangular, square, diamond, circular, oval, or a mixture thereof.

[0014] In various embodiments, the cured silicone has a Shore A hardness of 70 to 95 as measured according to ASTM D2240.

[0015] In various embodiments, the thickness of the cured silicone ranges from 10 to 300 μm.

[0016] In various embodiments, the cured silicone is obtained by curing a hydrosilylation-curable silicone composition.

[0017] In various embodiments, the hydrosilylation-curable silicone composition comprises: (A) the following components (A1) and (A2): (A1) a linear organopolysiloxane having at least two alkenyl groups per molecule, and (A2)SiO 4 / 2 Units, R 1 2nd Round 2 SiO 1 / 2 Units and R 1 3SiO 1 / 2 Resinous organopolysiloxanes containing units (wherein each R 1 are independently selected monovalent hydrocarbon groups containing no aliphatic unsaturation, and each R 2 are independently an alkenyl group), provided that the alkenyl group content in component (A2) is 0.5 to 5.0 mass %, and R 1 2nd Round 2 SiO 1 / 2 Units and R 1 3SiO 1 / 2 Units total moles of SiO 4 / 2The ratio to 1 mole of units is in the range of 0.70 to 1.10, an alkenyl group-containing organopolysiloxane in which the content of component (A2) is about 45 to about 65 mass % of the total mass of components (A1) and (A2); (B) an organopolysiloxane having at least two silicon-bonded hydrogen atoms per molecule, in an amount such that the number of silicon-bonded hydrogen atoms in component (B) is 0.1 to 5 moles per mole of alkenyl groups in component (A); and (C) a catalytic amount of a hydrosilylation reaction catalyst; Includes:

[0018] The foldable display of the present invention comprises: A flexible display device; and the silicone-laminated metal support.

[0019] In various embodiments, the foldable display is an organic light emitting diode (OLED) display. [Effects of the Invention]

[0020] The silicone-laminated metal substrate of the present invention can provide a flexible display with good repeatable bendability and good tactile aesthetics (e.g., good tactile feel). The flexible display of the present invention also has good repeatable bendability and good tactile aesthetics. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view showing an example of a silicone-laminated metal support of the present invention. [Figure 2] FIG. 2 is a perspective view with a partial cutaway showing another example of a silicone-laminated metal support of the present invention. [Figure 3] FIG. 1 is a schematic diagram showing an example of a method for producing a silicone-laminated metal support of the present invention. [Figure 4]FIG. 1 is a perspective view showing an example of a metal sheet for producing a silicone-laminated metal support of the present invention. [Figure 5] 1 is a cross-sectional view showing an example of a silicone-laminated metal support of the present invention. [Figure 6] FIG. 2 is a schematic diagram showing another example of a method for producing a silicone-laminated metal support of the present invention. [Figure 7] FIG. 2 is a cross-sectional view showing another example of a silicone-laminated metal support of the present invention. [Figure 8] FIG. 1 is a cross-sectional view of an example of a foldable display of the present invention. [Figure 9] FIG. 2 is a cross-sectional view of another example of a foldable display of the present invention. [Figure 10] FIG. 2 is a top view of a metal sheet used in the examples. [Figure 11] FIG. 1 is a schematic diagram showing how a texture analyzer is used to measure a push pressure test on a replica structure of a foldable display in an embodiment. [Figure 12] FIG. 2 is a schematic diagram showing a method for measuring the recovery performance of a silicone-laminated metal support in the examples. [Figure 13] FIG. 1 is a schematic diagram showing a method for measuring the static / dynamic folding properties of a silicone-laminated metal support in an example. [Figure 14] FIG. 1 is a cross-sectional view of a foldable display in an embodiment.

[0022] definition The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. Furthermore, as used herein, the terms "comprises," "comprising," "includes," and / or "including" specify the presence of stated features, integers, steps, operations, elements, components, and / or groups thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0023] The use of "for example," "eg," "such as," and "including" to list examples does not limit the examples listed. Thus, "for example," or "such as" means "for example, but not limited to" or "such as, but not limited to," and encompasses other similar or equivalent examples. As used herein, the term "about" serves to reasonably encompass or describe slight variations in a numerical value measured by instrumental analysis or as a result of sample handling. Such slight variations may be as little as ±0 to 25%, ±0 to 10%, ±0 to 5%, or ±0 to 2.5% of the numerical value. Furthermore, the term "about" applies to both numerical values ​​when relating to a range of values. Furthermore, the term "about" may be applied to a numerical value even when not explicitly stated.

[0024] It is understood that the appended claims are not limited to the explicit and specific compounds, compositions, or methods described in the detailed description, which may vary among specific embodiments falling within the scope of the appended claims. With respect to any Markush group relied upon herein to describe specific features or aspects of various embodiments, it should be understood that different, extraordinary, and / or unexpected results can be obtained from each element of the respective Markush group, independently of all other Markush elements. Each element of a Markush group may be relied upon individually and / or in combination to provide sufficient support for specific embodiments within the scope of the appended claims.

[0025] Any ranges and subranges relied upon in describing various embodiments of the present invention should also be understood to be within the scope of the appended claims, both individually and inclusively, and all ranges, including integer and / or fractional values, are understood to be described and contemplated therein, even if not expressly written herein. Those skilled in the art will readily recognize that the recited ranges and subranges fully describe and enable various embodiments of the present invention, and that such ranges and subranges may be further delineated into related halves, thirds, fourths, fifths, etc. As merely an example, a range "from 0.1 to 0.9" may be further delineated into a lower third, i.e., 0.1 to 0.3, a middle third, i.e., 0.4 to 0.6, and an upper third, i.e., 0.7 to 0.9, which are individually and inclusively within the scope of the appended claims and within which specific embodiments may be relied upon and provide sufficient support, individually and / or inclusively. Additionally, with respect to terms defining or modifying a range, such as "at least," "greater than," "less than," "less than or equal to," etc., such terms should be understood to include subranges and / or upper or lower limits. As another example, the range "at least 10" inherently includes subranges of at least 10 to 35, at least 10 to 25, 25 to 35, etc., each of which may be relied upon individually and / or collectively to provide sufficient support for specific embodiments within the appended claims. Finally, individual numbers within disclosed ranges may be relied upon to provide sufficient support for specific embodiments within the appended claims. For example, the range "from 1 to 9" includes various individual integers, such as 3, as well as individual numbers including decimal points (or fractions), such as 4.1, which may be relied upon to provide sufficient support for specific embodiments within the appended claims. DETAILED DESCRIPTION OF THE INVENTION

[0026] First, the silicone-laminated metal support 20 for the flexible display 46 of the present invention will be described in detail with reference to the drawings. The flexible display 46 may also be referred to herein as a foldable display 46 or a foldable display device 46. Generally, like numerals refer to like parts throughout the several figures.

[0027] FIG. 1 shows an example of a silicone-laminated metal substrate 20 of the present invention. As shown in FIG. 1, the silicone-laminated metal substrate 20 comprises a metal sheet 22 and a cured silicone 24. The metal sheet 22 has a plurality of through-holes 34, and the cured silicone 24 is bonded to one side of the metal sheet 22. The through-holes 34 are filled with the cured silicone 24. It should be understood that the amount of cured silicone 24 in the through-holes 34 may be uniform or vary. For example, the through-holes 34 may all be completely filled, all be partially filled, or a combination of partial and complete filling. Similarly, when the through-holes 34 are partially filled, they may be uniformly filled to the same level or amount, or the level or amount may vary, such as when different filling gradients exist at one or more locations on the metal sheet 22. Generally, the through-holes 34 are completely or nearly completely filled, and more generally, the through-holes 34 are completely filled.

[0028] Figure 2 shows another example of a silicone-laminated metal support 20 of the present invention. As shown in Figure 2, the silicone-laminated metal support 20 comprises a metal sheet 22 and a cured silicone material 24. The metal sheet 22 has a plurality of through-holes 34, and the cured silicone material 24 is adhered to both sides of the metal sheet 22. The through-holes 34 are filled with the cured silicone material 24.

[0029] The metal sheet 22 is not limited as long as it does not significantly reduce the flexibility of the silicone-laminated metal support 20 of the present invention, but is typically made of copper (Cu), aluminum (Al), titanium (Ti), stainless steel (SUS), nickel-titanium (Ni-Ti), nickel-aluminum (Ni-Al), copper-zinc-nickel (Cu-Zn-Ni), copper-aluminum-nickel (Cu-Al-Ni), copper-aluminum-manganese (Cu-Al-Mn), titanium-nickel-copper-molybdenum (Ti-Ni-Cu-Mo), cobalt-nickel-gallium:iron (Co-Ni-Ga:Fe), silver-nickel (Ag-Ni), gold-cadmium (Au-Cd), iron-platinum (Fe-Pt), iron-nickel (Fe-Ni), indium-cadmium (In-Cd), or an alloy thereof. Of these, the metal sheet 22 is typically made of stainless steel (SUS). The thickness of the metal sheet 22 is not limited, but is typically in the range of 1 to 500 μm, optionally in the range of 5 to 300 μm, optionally in the range of 50 to 300 μm, optionally in the range of 50 to 250 μm, or optionally in the range of 50 to 150 μm. This is because when the thickness is equal to or greater than the lower limit of the above range, the silicone-laminated metal support 20 has adequate mechanical strength, while when the thickness is equal to or less than the upper limit of the above range, the silicone-laminated metal support 20 has good flexibility. The (average) thickness of the metal sheet 22 may be uniform or may vary.

[0030] The through-holes 34 are formed to allow the silicone-laminated metal support 20 to bend. That is, the through-holes 34 serve as the foldable region 48 for the silicone-laminated metal support 20 of the present invention. The through-holes 34 generally reduce the difference in tactile aesthetics, specifically, the difference in tactile aesthetics between the foldable region 48 and the non-foldable region of the foldable display 46. In FIG. 1 or FIG. 2 , the through-holes 34 are typically aligned in a first direction parallel to the metal sheet 22 and typically shifted in a second direction perpendicular to the first direction. Furthermore, the through-holes 34 are typically rectangular, square, diamond-shaped, circular, elliptical, or a combination thereof. For example, the through-holes 34 may be a combination of a rectangle and a square, a circle and a square, or a diamond, circle, and ellipse. The number of rows of through holes is not limited as long as it does not significantly reduce the flexibility of the silicone-laminated metal support 20 of the present invention, but is typically in the range of 5 to 200, or optionally in the range of 5 to 100.

[0031] The size of the through holes 34 is not limited, but the width is typically in the range of 1 to 500 μm, optionally in the range of 5 to 300 μm, optionally in the range of 50 to 300 μm, optionally in the range of 50 to 250 μm, or optionally in the range of 50 to 150 μm. The length of the through holes 34 is not limited, but is typically in the range of 100 to 2000 μm, optionally in the range of 500 to 2000 μm, or optionally in the range of 1000 to 2000 μm. This is because, when the length is equal to or greater than the lower limit of the above range, the silicone-laminated metal support 20 has good flexibility, while when the length is equal to or less than the upper limit of the above range, the silicone-laminated metal support 20 has adequate mechanical strength. As described above, the through holes 34 may have the same shape or two or more different shapes. Similarly, the size of the through holes 34 may be uniform or may vary. For example, the through-holes 34 may be rectangular in shape and of generally the same size and shape, or may be circular in shape and of varying diameters and / or depths.

[0032] The cured silicone product 24 typically has a hardness, as measured using the Shore A hardness scale specified in ASTM D2240, in the range of 70 to 95, optionally in the range of 75 to 95, or optionally in the range of 75 to 90. The reason for this is as follows: if the hardness of the cured silicone product is below the lower limit of the recited range, the strength of the cured silicone product may be insufficient, while if the hardness exceeds the upper limit of the recited range, the flexibility of the target silicone-laminated metal support 20 tends to be insufficient.

[0033] To exhibit satisfactory flexibility, the silicone cured material 24 is typically formed from a silicone cured material having a tensile strength of at least 10 MPa and an elongation of at least 30%, as specified and measured according to ASTM D412. The tensile strength is typically at least 15 MPa. In these and other embodiments, the elongation is typically at least 50%. The reason for this is that the flexibility of the silicone-laminated metal substrate 20 becomes insufficient below the indicated ranges.

[0034] The thickness of the silicone cured product 24 is not limited, but is typically in the range of 10 to 300 μm, optionally in the range of 10 to 250 μm, optionally in the range of 50 to 250 μm, or optionally in the range of 50 to 175 μm. This is because, when the thickness is at or above the lower limit of the above range, the silicone-laminated metal support 20 has appropriate mechanical strength, while when the thickness is at or below the upper limit of the above range, the silicone-laminated metal support 20 has good flexibility.

[0035] In consideration of economic efficiency, the silicone cured product 24 is obtained by curing a hydrosilylation-curable silicone composition, in particular: (A) the following components (A1) and (A2): (A1) a linear organopolysiloxane having at least two alkenyl groups per molecule, and (A2)SiO 4 / 2 Units, R 1 2nd Round 2SiO 1 / 2 Units and R 1 3SiO 1 / 2 Resinous organopolysiloxanes comprising, optionally consisting essentially of, or optionally consisting of units, 1 are the same or different monovalent hydrocarbon groups containing no aliphatic unsaturated bonds, and each R 2 is an alkenyl group), optionally consisting essentially of, or optionally consisting of, provided that the alkenyl group content is 0.5 to 5.0 wt. %; 1 2nd Round 2 SiO 1 / 2 Units and R 1 3SiO 1 / 2 Units total moles of SiO 4 / 2 The ratio to 1 mole of units is in the range of 0.70 to 1.10, an alkenyl group-containing organopolysiloxane in which the content of component (A2) is about 45 to about 65 mass % of the total mass of components (A1) and (A2); (B) an organopolysiloxane having at least two silicon-bonded hydrogen atoms per molecule, the amount of which is such that the number of silicon-bonded hydrogen atoms in this component is 0.1 to 5 moles per mole of alkenyl groups in component (A); and (C) a catalytic amount of a hydrosilylation reaction catalyst; The silicone composition may be obtained by curing a hydrosilylation-curable silicone composition comprising:

[0036] Component (A) is an alkenyl-containing organopolysiloxane and is used as the basic component of the present composition. In various embodiments, component (A) consists essentially of the following components (A1) and (A2):

[0037] Component (A1) is a linear organopolysiloxane having at least two alkenyl groups per molecule. The alkenyl groups in component (A1) are exemplified by alkenyl groups having 2 to 12 carbon atoms, such as vinyl, allyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, and dodecenyl. Vinyl and allyl groups are typical. The silicon-bonded groups other than alkenyl groups in component (A1) are exemplified by alkyl groups having 1 to 12 carbon atoms, such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, and dodecyl; aryl groups having 6 to 12 carbon atoms, such as phenyl, tolyl, xylyl, and naphthyl; aralkyl groups having 7 to 12 carbon atoms, such as benzyl, phenethyl, and naphthylethyl; and halogen-substituted alkyl groups having 1 to 12 carbon atoms, such as 3-chloropropyl and 3,3,3-trifluoropropyl. Methyl and phenyl groups are typical.

[0038] Component (A1) has a substantially linear molecular structure, although a portion of the molecular chain may be branched or somewhat branched. The viscosity of component (A1) at 25°C is not limited, but is typically in the range of 1,000 mPa·s to 50,000 mPa·s, optionally 1,500 mPa·s to 45,000 mPa·s, or optionally 2,000 mPa·s to 45,000 mPa·s. The reason for this is as follows: if the viscosity of component (A1) at 25°C is below the above-mentioned lower limit, the silicone cured product 24 obtained by curing the composition tends to have insufficient flexibility. On the other hand, if the viscosity of component (A1) at 25°C exceeds the above-mentioned upper limit, the transparency of the silicone cured product 24 obtained by curing the composition tends to decrease at high temperatures, and the composition is presumed to have an excessively high viscosity, which tends to deteriorate the handling characteristics.

[0039] The organopolysiloxane of component (A1) is exemplified by dimethylpolysiloxanes end-blocked at both molecular chain terminals with dimethylvinylsiloxy groups, copolymers of dimethylsiloxane and methylvinylsiloxane end-blocked at both molecular chain terminals with dimethylvinylsiloxy groups, methylvinylpolysiloxanes end-blocked at both molecular chain terminals with trimethylsiloxy groups, copolymers of dimethylsiloxane and methylvinylsiloxane end-blocked at both molecular chain terminals with trimethylsiloxy groups, and mixtures of two or more of the foregoing.

[0040] Component (A2) is SiO 4 / 2 Units, R 1 2nd Round 2 SiO 1 / 2 Units and R 1 3SiO 1 / 2 The resinous organopolysiloxane comprises, optionally consisting essentially of, or optionally consisting of units, and is used to impart sufficient hardness and flexibility to the silicone cured product 24 provided by curing the composition.

[0041] In the formula, R 1 R are the same or different monovalent hydrocarbon groups that do not contain aliphatic unsaturated bonds. 1 The hydrocarbon groups are exemplified by alkyl groups having 1 to 12 carbon atoms, such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, and dodecyl; aryl groups having 6 to 12 carbon atoms, such as phenyl, tolyl, xylyl, and naphthyl; aralkyl groups having 7 to 12 carbon atoms, such as benzyl, phenethyl, and naphthylethyl; and halogen-substituted alkyl groups having 1 to 12 carbon atoms, such as 3-chloropropyl and 3,3,3-trifluoropropyl. Methyl and phenyl groups are typical.

[0042] In the formula, each R 2 are independently alkenyl groups. 2The alkenyl groups are exemplified by alkenyl groups having 2 to 12 carbon atoms, such as vinyl, allyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, and dodecenyl groups. Vinyl and allyl groups are typical.

[0043] Component (A2) has an alkenyl group content of 0.5 to 5.0 mass%, optionally 1.0 to 5.0 mass%, optionally 2.0 to 5.0 mass%, optionally 3.0 to 5.0 mass%, or optionally 3.0 to 4.5 mass%. The reason for this is as follows: if the alkenyl group content is below the stated lower limit, the hardness of the silicone cured product 24 provided by curing the composition tends to decrease, while if the alkenyl group content exceeds the stated upper limit, the flexibility of the silicone cured product 24 provided by curing the composition tends to decrease.

[0044] In component (A2), R 1 2nd Round 2 SiO 1 / 2 Units and R 1 3SiO 1 / 2 Units total moles of SiO 4 / 2 The ratio per mole of units is in the range of 0.70 to 1.10, or optionally in the range of 0.80 to 1.10, for the following reason: if the ratio is below the stated lower limit, component (A2) will have an excessively large molecular weight, and the transparency of the cured silicone product 24 provided by curing the composition may be reduced, while if the ratio exceeds the stated upper limit, the strength of the cured silicone product 24 provided by curing the composition may be insufficient.

[0045] The content of component (A2) is in the range of 20 to 50% by weight, optionally in the range of about 20 to about 45% by weight, or optionally in the range of 25 to about 40% by weight of the total weight of components (A1) and (A2). The reason for this is as follows: if the content is below the lower limit of the stated range, the hardness of the cured silicone product 24 obtained by curing the composition tends to decrease, while if the content exceeds the upper limit of the stated range, the flexibility of the cured silicone product 24 obtained by curing the composition tends to decrease.

[0046] Component (B) is an organopolysiloxane containing silicon-bonded hydrogen atoms and is used as a crosslinking agent for the present composition. The silicon-bonded hydrogen atoms may be bonded, for example, to terminal positions and / or side chain positions of the molecular chain. The silicon-bonded groups other than hydrogen atoms in component (B) are represented by R 1 Examples of the monovalent hydrocarbon groups containing no aliphatic unsaturation are those described in the following: Methyl and phenyl groups are typical.

[0047] In certain embodiments, component (B) is SiO 4 / 2 Units and R 1 2HSiO 1 / 2 Resinous organopolysiloxanes comprising, optionally consisting essentially of, or optionally consisting of units, wherein R 1 is as above, and R 1 2HSiO 1 / 2 Units total moles of SiO 4 / 2 The ratio to 1 mole of the unit is in the range of 0.70 to 1.80.

[0048] In the formula, R 1 are the same or different monovalent hydrocarbon groups, as described above, that contain no aliphatic unsaturation. Methyl and phenyl groups are typical.

[0049] In the formula, R 1 2HSiO 1 / 2 Units total moles of SiO 4 / 2The ratio per mole of units is in the range of 0.70 to 1.80, optionally in the range of 0.80 to 1.70, optionally in the range of 0.90 to 1.70, or optionally in the range of 1.00 to 1.70. The reason for this is as follows: if the ratio is below the stated lower limit, component (B) will have an excessively large molecular weight, and the transparency of the cured silicone product 24 provided by curing the composition may be reduced, while if the ratio exceeds the stated upper limit, the strength of the cured silicone product 24 provided by curing the composition may be insufficient.

[0050] The content of component (B) in the composition is an amount such that there are 0.1 to 5 moles, optionally 0.5 to 3 moles, or optionally about 0.5 to 2 moles of silicon-bonded hydrogen atoms in this component per mole of alkenyl groups in component (A).The reason for this is as follows: if the content is below the lower limit of the stated range, the composition tends to be insufficiently cured, while if the content exceeds the upper limit of the stated range, the flexibility and / or transparency of the silicone cured product provided by curing the composition may be reduced.

[0051] Component (C) is a hydrosilylation catalyst that promotes the curing of the composition. Component (C) hydrosilylation catalysts are exemplified by platinum-type catalysts, rhodium-type catalysts, and palladium-type catalysts. Platinum-type catalysts are particularly typical. These platinum-type catalysts are exemplified by platinum fine powder, platinum black, platinum supported on silica fine powder, platinum supported on activated carbon, chloroplatinic acid, alcohol solutions of chloroplatinic acid, and platinum compounds such as platinum olefin complexes and platinum alkenylsiloxane complexes.

[0052] The content of component (C) in the composition is a catalytic amount, specifically an amount that provides 0.01 to 1,000 ppm by mass of catalytic metal atoms to the composition. The reason for this is as follows: if the content is below the lower limit of the stated range, there is a risk that the resulting composition will not cure sufficiently, while if the content exceeds the upper limit of the stated range, curing will not be significantly accelerated, and there is a risk that problems such as discoloration of the silicone cured product 24 will occur.

[0053] The composition may further comprise (D) a hydrosilylation reaction inhibitor to control the cure rate of the composition. Examples of the hydrosilylation reaction inhibitor of component (D) include alkyne alcohols such as 2-methyl-3-butyn-2-ol, 3,5-dimethyl-1-hexyn-3-ol, 1-ethynylcyclohexan-1-ol, and 2-phenyl-3-butyn-2-ol; eneyne compounds such as 3-methyl-3-penten-1-yne and 3,5-dimethyl-3-hexen-1-yne; and 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetrahexenylcyclotetrasiloxane, benzotriazole, and the like.

[0054] The content of component (D) in the composition is not limited and may be selected appropriately depending on the molding method and curing conditions, but an amount within the range of 0.001 to 5 parts by mass per 100 parts by mass of component (A) is generally used.

[0055] The composition may contain, for example, adhesion promoters, flame retardants, inorganic fillers, pigments, etc., as long as the purpose of the present invention is not impaired. However, adhesion promoters, flame retardants, and inorganic fillers are generally not incorporated in view of the transparency of the cured silicone product 24 provided by curing the composition.

[0056] A method for manufacturing a silicone-laminated metal support 20 is typically, but not exclusively, shown in FIG. 3, which is a schematic diagram illustrating a method for manufacturing a silicone-laminated metal support 20 according to an exemplary embodiment.

[0057] First, the metal sheet 22 shown in Fig. 4 is prepared by chemical etching, punching, or laser cutting a flat metal sheet. According to Fig. 4, the metal sheet 22 is supported by a support 32 and has a plurality of through holes 34 fixed thereto.

[0058] The metal sheet 22 is set in a jig 26, and the curable silicone composition 28 is applied with a squeegee 30. The curable silicone composition 28 on the metal sheet 22 is then cured by heating. Figure 5 shows a silicone-laminated metal support 20 in which a cured silicone 24 is adhered to one side of the metal sheet 22.

[0059] Figure 6 is a schematic diagram showing another method for manufacturing a silicone-laminated metal support 20 according to an exemplary embodiment. According to Figure 6, a metal sheet 22 having a cured silicone 24 applied to one side thereof is set on a jig 26, and a curable silicone composition 28 is applied to the other side of the metal sheet 22 with a squeegee 30. The curable silicone composition 28 on the metal sheet 22 is cured by heating. Figure 7 shows a silicone-laminated metal support 20 in which the cured silicone 24 is adhered to both sides of the metal sheet 22.

[0060] Next, the foldable display 46 of the present invention will be described in detail with reference to the drawings.

[0061] 8 or 9 shows an example of a foldable display 46 of the present invention. As shown in Fig. 8 or 9, the foldable display 46 includes a silicone-laminated metal support 20 including a metal sheet 22 and a cured silicone material 24, an optically transparent adhesive 36, a flexible device 40, an optically transparent adhesive 37, a polarizing film 42, an optically transparent adhesive 38, and a cover window 44. As shown in Fig. 8 or 9, the foldable display device 46 is characterized by having a foldable region 48. The flexible device 40 may also be referred to as a flexible display device 40 in this specification.

[0062] 8 or 9, an optically clear adhesive 36 is used to adhere the silicone-laminated metal support 20 to the flexible device 40. However, the optically clear adhesive 36 may be optional if the silicone-laminated metal support 20 is directly adhered to the flexible device 40. The optically clear adhesive 36 may be, for example, a silicone adhesive or an acrylic adhesive. The optically clear adhesive 36 is not limited as long as it does not significantly reduce the flexibility of the flexible display 46. Typically, the thickness of the optically clear adhesive 36 is 10 μm or less.

[0063] As shown in FIG. 8 or 9 , an optically clear adhesive 37 is used to bond the flexible device 40 to the polarizing film 42, and another optically clear adhesive 38 is used to bond the polarizing film 42 to the cover window 44. The polarizing film 42 may be disposed on the flexible device 40 to prevent reflection of external light. The optically clear adhesives 37 and 38 may be, for example, a silicone optically clear adhesive or an acrylic optically clear adhesive. The optically clear adhesives 37 and 38 are not limited as long as the flexibility of the flexible display 46 is not significantly reduced. Typically, the thickness of the adhesives 37 and 38 is 100 μm or less.

[0064] The cover window 44 is typically made of a flexible material such as a plastic material, and may be made of one or more materials selected from the group consisting of polyethylene terephthalate (PET), polyester, polyethylene naphthalate (PEN), polyether ether ketone (PEEK), polycarbonate (PC), polyethersulfone (PES), polyimide (PI), polyarylate (PAR), polycyclic olefin (PCO), and polynorbornene.

[0065] Examples of foldable displays 46 include cholesteric liquid crystal (LC) displays, polymer dispersed liquid crystal (PDLC) displays, electrophoretic (EP) displays, and organic light emitting diode (OLED) displays. [Example]

[0066] The silicone-laminated metal substrate for a foldable display and the foldable display of the present invention will be described in detail below using examples. In the examples, the viscosity is measured at 25°C. In the following chemical formula, "Me" represents a methyl group, and "Vi" represents a vinyl group.

[0067] The following components were used as component (A): Component (a-1): Dimethylpolysiloxane with a viscosity of 45,000 mPa·s and a vinyl group content of 0.09% by mass, with both molecular chain ends capped with dimethylvinylsiloxy groups. Component (a-2): Dimethylpolysiloxane with a viscosity of 10,000 mPa·s and a vinyl group content of 0.14% by mass, in which both molecular chain ends are end-blocked with dimethylvinylsiloxy groups. Component (a-3): Dimethylpolysiloxane with a viscosity of 350 mPa·s and a vinyl group content of 0.47% by mass, in which both molecular chain ends are end-blocked with dimethylvinylsiloxy groups. Component (a-4): vinyl group content 4.20% by mass, average unit formula: (Me3SiO 1 / 2 ) 0.34 (Me2ViSiO 1 / 2 ) 0.11 (SiO 4 / 2 ) 0.55 A resinous organopolysiloxane represented by the formula:

[0068] The following components were used as component (B): Component (b-1): having a silicon-bonded hydrogen atom content of 0.96% by mass and having the average unit formula: (MeHSiO 1 / 2 ) 1.58 (SiO 4 / 2 ) 1.00 Organopolysiloxane represented by the formula:

[0069] The following components were used as component (C): Component (c-1): A solution of dimethylpolysiloxane, 1,3-divinyltetramethyldisiloxane platinum complex, with a viscosity of 350 mPa·s and a vinyl group content of 0.47% by mass, and with both molecular chain ends capped with dimethylvinylsiloxy groups (platinum metal content in this component as a mass unit = approximately 1.7% by mass).

[0070] The following component was used as component (D): Component (d-1): 3,5-dimethyl-1-hexyn-3-ol

[0071] The following components were used as adhesion promoters: Component (e-1): the following average unit formula: [(CH2=CH)(CH3)SiO 2 / 2 ] 0.23 [CH2(O)CHCH2OC3H6SiO 3 / 2 ] 0.31 [(CH3)2SiO 2 / 2 ] 0.46 (CH3O 1 / 2 ) 0.2 Organopolysiloxanes represented by

[0072] The following ingredients were used as pigments: Component (f-1): Carbon black powder. This carbon black powder was added as a masterbatch consisting of 50% by mass of this carbon black powder and 50% by mass of dimethylpolysiloxane, both molecular chain ends of which were capped with dimethylvinylsiloxy groups, with a viscosity of 2,000 mPa s and a vinyl group content of 0.23% by mass.

[0073] <Reference examples 1~3> Furthermore, the components shown in Table 1 below were mixed uniformly in the amounts and ratios shown in Table 1 to produce a hydrosilylation-curable silicone composition. The resulting composition was heated at 150°C for 5 minutes to produce a 1 mm thick cured silicone product, and the tensile strength and elongation of this cured silicone product were measured. The composition was further heated at 150°C for 10 minutes to produce a 6 mm thick cured silicone product, and this cured product was subjected to hardness measurement at 25°C. The results are shown in Table 1. In Table 1, "SiH / Vi" indicates the ratio of the number of moles of silicon-bonded hydrogen atoms in component (B) per mole of vinyl groups in component (A). The properties of the cured silicone product (hardness, tensile strength, and elongation) were tested, measured, or evaluated using the following methods.

[0074] <Hardness> The hydrosilylation-curable silicone composition was cured by heating at 150°C for 10 minutes to produce a cured product 6 mm thick. The Shore A hardness of this cured silicone product was measured using a type A durometer specified in ASTM D2240.

[0075] <Curability> The cure of test materials is determined using a moving die rheometer (MDR). The MDR measures the torque required to oscillate the lower die through a small arc. The displacement torque, S', increases as the test material cures and is automatically plotted and / or calculated as pounds-inches (Newton-meters) versus time using pre-set computerized parameters. The curve is a function of the test temperature and properties of the cured and uncured test material, namely, plasticity, scorch time, durometer, cure rate, and modulus of elasticity. The instrument can also measure the non-displacement torque, S'' (loss modulus), and calculate tan delta (the ratio of S'' / S'). The test process steps are as follows: 1. Setting the test temperature, time sweep and arc; 2. Preparing or compounding the test material as specified; 3. Weighing out enough material to provide a volume of 5.0 + / - 0.5 mL based on the specific gravity of the material; 4. Placing the sample between two 4 x 5 inch (10 x 13 cm) pieces of release film to form a sandwich; 5. Open the platens of the rheometer, place the material in the center of the lower die, and close the platens. The test will start automatically once the die is closed. Print out the data at the end of the test. 6. Remove the sample, open the platens, remove the cured material, and close the platens.

[0076] The test results are shown. Displacement torque, S', (minimum or maximum) Non-displacement torque, S”, (min or max) ts1 (time to exceed minimum value S' by one torque unit) t10 (time required to complete 10% of maximum hardening) t50 (time required to complete 50% of maximum hardening) t90 (time required to complete 90% of maximum hardening) "Torque units" are lb-in unless otherwise specified. "Time" is in seconds unless otherwise specified.

[0077] The reference test standard is ASTM D 5289-92.

[0078] <Lap shear> The adhesion of the test material is determined by measuring the amount of pull required to separate the lap shear laminate. The test process steps are as follows: 1. Preparing a SUS substrate (size: 2.5 cm x 7.6 cm x 0.2 cm T); 2. Cleaning the SUS substrate with isopropyl alcohol or acetone and air drying them; 3. Prepare suitable shims so that the sample wire thickness (T) is 0.50 mm and place them on the top surface of the SUS substrate; 4. Dispensing 1.5 g of test material onto the shim with the SUS substrate; 5. Placing a second SUS substrate directly on top of the SUS substrate onto which the material was dispensed, with the test / bonding area being 25mm x 10mm x 0.5mm T (defined by the SUS substrate and shim); 6. The process of overlapping the SUS substrate so that the SUS substrate extends 2.5 mm beyond the bonding area; 7. Clamping the sandwiched SUS substrate; 8. Removing excess material from the sides of the sandwiched SUS substrate; 9. placing the laminate with the test material in an oven at a specific temperature to cure the test material; 10. Placing one laminate into a tensile type testing machine such as an Instron materials testing machine or a universal testing machine (UTM) and pulling the laminate apart at a rate of 50 mm / min; 11. Repeat the pull with the other two laminates, calculate the pull required to shear the laminate, and report the average of the three values ​​in pounds per square inch.

[0079] Results are reported in pounds per square inch (psi). The amount of adhesive or cohesive failure is estimated. Reference standards are ASTM D-816, ASTM D-1002, MIL-S-8802, and ASTM C-961.

[0080] [Table 1]

[0081] <Examples IE1 to IE4> To produce a silicone-laminated metal support comprising a SUS sheet and a cured silicone product by curing the curable silicone composition prepared in Reference Example 1, etched SUS sheets of 150 μm or 250 μm thickness shown in Figure 10 were used. The cured silicone product of various thicknesses was adhered to one side of SUS sheets of various thicknesses, filling the through-holes. The sizes of the etched SUS sheets shown in Figure 10 are as follows: L0=1400μm, L1=200μm, W0=100μm, W1=200μm. Number of rows of through holes = 50 The silicone-laminated metal substrates were evaluated by the following indentation press test, static folding test, and dynamic folding test, the test results of which are further shown in Table 2 below.

[0082] <Comparative examples CE1~CE6> To produce silicone-laminated metal substrates comprising a SUS sheet and a cured silicone product by curing the curable silicone composition prepared in Reference Example 1, unetched flat SUS sheets of 50 μm, 150 μm, or 250 μm in thickness were used. The cured silicone product, with various thicknesses, was adhered to one side of the SUS sheet, with various thicknesses. The silicone-laminated metal substrates were evaluated using the indentation press test, static folding test, and dynamic folding test described below. The test results are also shown in Table 2.

[0083] <Pressure test> As shown in Figure 11, the indentation force test is a method in which a spherical probe (φ2 mm) is pressed with a force (0.36 N) to measure the depth. The test results relate to the stress release performance from external impact. Specifically, the indentation force test method using a texture analyzer is designed to measure or compare the stress release performance of samples from internal impact.

[0084] <Static folding test> As shown in Figure 12, the static folding test is a method for measuring recovery performance after bending at 105°C for 1,000 hours. Static folding test performance is measured by the height of warpage after the sample structure is flattened. Samples with poor static folding performance exhibit permanent warpage. Samples with good static folding performance flatten immediately after the bending force is released.

[0085] <Dynamic folding test> As shown in Figure 13, the dynamic folding test is a method for measuring recovery performance after dynamic bending at 23±2°C. Dynamic folding test performance is measured by the warpage height after the sample structure is flattened. Samples with poor dynamic folding performance exhibit permanent warpage and broken pattern bridges. Samples with good dynamic folding performance remain flat immediately after the bending force is released and do not break pattern bridges.

[0086] [Table 2]

[0087] [Table 3]

[0088] <Example IE5 to IE9> To produce a silicone-laminated metal support comprising a SUS sheet and a cured silicone product by curing the curable silicone composition prepared in Reference Example 1, etched SUS sheets of 150 μm or 250 μm thickness shown in Figure 10 were used. The cured silicone product of various thicknesses was adhered to both sides of the SUS sheets of various thicknesses, filling the through-holes. The sizes of the etched SUS sheets shown in Figure 10 are as follows: L0=1400μm, L1=200μm, W0=100μm, W1=200μm. Number of rows of through holes = 50 The silicone-laminated metal substrates were evaluated by the indentation press test, static folding test, and dynamic folding test described above, and the test results are shown in Table 3 below.

[0089] <Comparative examples CE7~CE12> To produce silicone-laminated metal substrates comprising a SUS sheet and a cured silicone product by curing the curable silicone composition prepared in Reference Example 1, unetched SUS sheets of 50 μm, 150 μm, or 250 μm thick were used. The cured silicone product, having various thicknesses, was adhered to both sides of the SUS sheet, having various thicknesses. The silicone-laminated metal substrates were evaluated using the indentation press test, static folding test, and dynamic folding test described above. The test results are also shown in Table 3.

[0090] [Table 4]

[0091] [Table 5]

[0092] Example IE10 The silicone-laminated metal support 10 prepared in Example IE9 was used to fabricate a foldable display 46 as shown in FIG. 14. Other components shown in FIG. 14 included a 25 μm optically transparent adhesive 36, a 50 μm polyimide film as the polarizing film 42, a 25 μm optically transparent adhesive 38, and a 30 μm glass sheet as the cover window 44. The foldable display 46 was evaluated by the following bending / folding test, pen touch protection test, and ball drop protection test. The test results are further shown in Table 4 below.

[0093] <Comparative Examples CE13 and CE14> Comparative foldable displays were produced by replacing the silicone-laminated metal support 10 produced in Example 1E9 with a 300 μm cured silicone support (for CE13) and a polyurethane-laminated metal support (for CE14). The polyurethane-laminated metal support used in Comparative Example CE14 was composed of 75 μm polyurethane foam, 150 μm SUS sheet, and another 75 μm polyurethane foam. The other components of the comparative foldable displays in Comparative Examples CE13 and CE14 were the same as those used in Example IE10.

[0094] The comparative foldable displays were evaluated by the bending / folding test, the pen touch protection test, and the drop protection test described below, and the test results are also shown in Table 4.

[0095] <Static folding test> A static folding test is used to verify the recovery performance when bent at a high temperature of 105°C. This test is measured by the warpage height after aging, which is related to the permanent deformation. The test process steps are as follows: 1. Preparing unetched or etched metal sheets, cleaning the metal sheets with isopropyl alcohol or acetone, and allowing them to air dry. 2. Compounding test materials as specified. 3. Applying the test material onto the prepared metal sheet using the exemplary method illustrated in FIG. 3 to produce the silicone-laminated metal substrate of the present invention. 4. The metal sheet with the test material applied is placed in an oven at a specific temperature to harden the test material. 5. Folding the coated metal sheet with a bending radius of 1 mm and clamping the folded metal sheet using a mechanical fixture. 6. The clamped metal sheets are placed in a high-temperature oven at 105°C for 1,000 hours. 7. Release the test specimen from the mechanical fixture, place it on a flat table, and measure the warpage height.

[0096] Samples with poor static folding performance exhibit permanent deformation with a warped shape, while samples with good static folding performance remain flat after aging and release from the bending force of the mechanical fixture.

[0097] <Dynamic folding test> The dynamic folding test shows the recovery performance after 200,000 folding cycles at 1 cycle / second with a folding radius of 1 mm. This test is measured by the warpage height after 200,000 folding cycles. The test process steps are as follows: 1. Preparing unetched or etched metal sheets, cleaning the metal sheets with isopropyl alcohol or acetone, and allowing them to air dry. 2. Compounding test materials as specified. 3. Applying the test material onto the prepared metal sheet using the exemplary method illustrated in FIG. 3 to produce the silicone-laminated metal substrate of the present invention. 4. The metal sheet with the test material applied is placed in an oven at a specific temperature to harden the test material. 5. Placing the coated metal sheet in a folding / unfolding machine with a 1 mm bend radius for 200,000 folding cycles at 23±2°C. 6. Release from the folding / unfolding machine and place the test specimen on a flat table to measure the warpage height and also inspect the etching pattern cracks on the metal sheet.

[0098] Samples with poor dynamic folding performance show permanent deformation with warped shape and etching pattern cracks in the metal sheet, whereas samples with good dynamic folding performance are flat without pattern cracks after the folding cycle test.

[0099] <Pen touch protection test> The pen touch protection test is used to evaluate impact resistance, typically using a pen drop test method. The test process steps are as follows: 1. Preparing the multilayer structure samples manufactured in Example IE10 and Comparative Examples CE13 / CE14. 2. Prepare a 0.7 mm BIC Orange pen (5.3 g). 3. The BIC orange pen is held vertically and dropped onto the designated position on the multilayer structure sample. 4. Inspecting and evaluating the condition of the substrate based on the following criteria: Good is the absence of nicks and pressings, NG is the presence of nicks and pressings or destruction. 5. Record the maximum height at which the pen drops to a good condition (no dents or pressure).

[0100] <Fall protection test> In the display industry, a drop ball test is used to evaluate impact resistance. The test process steps are as follows: 1. Preparing the multilayer structure samples manufactured in Example IE10 and Comparative Examples CE13 / CE14. 2. A process for preparing a 20g steel ball. 3. A sphere is dropped vertically onto a designated position on the multilayer structure sample. 4. Inspecting and evaluating the condition of the substrate based on the following criteria: Good means no dents or pressings, NG means dents and pressings are present or destroyed. 5. The process of recording the maximum height at which the ball falls while remaining in good condition (no dents or pressure).

[0101] [Table 6]

[0102] Industrial Applicability The silicone-laminated metal support of the present invention can impart good, repeatable bending properties and good tactile aesthetics (e.g., good tactile feel) to flexible displays, and is therefore advantageous as a bendable support for flexible displays that require high durability, such as cholesteric liquid crystal (ChLC) displays, polymer-dispersed liquid crystal (PDLC) displays, electrophoretic (EP) displays, and organic light-emitting diode (OLED) displays. [Explanation of symbols]

[0103] 20: Silicone laminated metal support 22 metal sheets 24: Silicone hardened material 26: Jig 28: Curable silicone composition 30: Squeegee 32: Base material 34:Through hole 36, 37, 38 Optically clear adhesives 40: Flexible devices / flexible display devices 42: Polarizing film 44: Cover window 46 Flexible Display / Foldable Display / Foldable Display Device 48: Collapsible area

Claims

1. A silicone-laminated metal support (20) for a foldable display (46), comprising: a metal sheet (22) having a plurality of through holes (34); and a cured silicone material (24) adhered to at least one side of the metal sheet (22), the through holes (34) being formed for bending the silicone-laminated metal support (20) and being filled with the cured silicone material (24).

2. 2. The silicone-laminated metal support for a foldable display according to claim 1, wherein the metal sheet comprises or is made of copper (Cu), aluminum (Al), titanium (Ti), stainless steel (SUS), nickel-titanium (Ni—Ti), nickel-aluminum (Ni—Al), copper-zinc-nickel (Cu—Zn—Ni), copper-aluminum-nickel (Cu—Al—Ni), copper-aluminum-manganese (Cu—Al—Mn), titanium-nickel-copper-molybdenum (Ti—Ni—Cu—Mo), cobalt-nickel-gallium:iron (Co—Ni—Ga:Fe), silver-nickel (Ag—Ni), gold-cadmium (Au—Cd), iron-platinum (Fe—Pt), iron-nickel (Fe—Ni), or indium-cadmium (In—Cd).

3. 2. The silicone-laminated metal support (20) for a foldable display (46) according to claim 1, wherein the thickness of said metal sheet (22) is in the range of 1 to 500 μm.

4. 2. The silicone-laminated metal support (20) for a foldable display (46) as described in claim 1, wherein the through holes (34) are arranged in a first direction parallel to the metal sheet (22) and are arranged at positions shifted in a second direction perpendicular to the first direction.

5. 2. The silicone-laminated metal support (20) for a foldable display (46) according to claim 1, wherein the shape of the through-holes (34) is rectangular, square, diamond, circular, elliptical, or a mixture thereof.

6. 2. The silicone-laminated metal support (20) for a foldable display (46) according to claim 1, wherein the silicone cured product (24) has a Shore A hardness of 70 to 95 as measured according to ASTM D2240.

7. 2. The silicone-laminated metal support (20) for a foldable display according to claim 1, wherein the thickness of the silicone cured product is in the range of 10 to 300 μm.

8. 2. The silicone-laminated metal support (20) for a foldable display (46) according to claim 1, wherein the silicone cured product (24) is obtained by curing a hydrosilylation-curable silicone composition (28).

9. The hydrosilylation-curable silicone composition (28) (A) The following components (A １ ) and (A ２ ), i.e., (A １ ) a linear organopolysiloxane having at least two alkenyl groups per molecule, and (A ２ ) SiO ４／２ Unit, R １ ２ R ２ SiO １／２ Units and R １ ３ SiO １／２ Resinous organopolysiloxanes containing units (wherein each R １ are independently selected monovalent hydrocarbon groups containing no aliphatic unsaturation, and each R ２ are independently an alkenyl group), provided that component (A) ２ The content of alkenyl groups in R １ ２ R ２ SiO １／２ Units and R １ ３ SiO １／２ Total moles of SiO ４／２ The ratio to 1 mole of units is in the range of 0.70 to 1.10, Component (A ２ The content of component (A １ ) and (A ２ an alkenyl group-containing organopolysiloxane in an amount of about 45 to about 65% by weight of the total weight of (B) an organopolysiloxane having at least two of said silicon-bonded hydrogen atoms per molecule, said organopolysiloxane having at least two of said silicon-bonded hydrogen atoms per molecule in an amount such that there are 0.1 to 5 moles of silicon-bonded hydrogen atoms in component (B) per mole of alkenyl groups in component (A); (C) a catalytic amount of a hydrosilylation reaction catalyst.

10. a flexible display device (40); A silicone-laminated metal support (20) for a foldable display (46) according to any one of claims 1 to 9.

11. The foldable display of claim 10, wherein the flexible display device (40) is an organic light emitting diode (OLED) device.

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