WO2022077721A1 - 支撑件及可折叠显示模组 - Google Patents

支撑件及可折叠显示模组 Download PDF

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Publication number
WO2022077721A1
WO2022077721A1 PCT/CN2020/132750 CN2020132750W WO2022077721A1 WO 2022077721 A1 WO2022077721 A1 WO 2022077721A1 CN 2020132750 W CN2020132750 W CN 2020132750W WO 2022077721 A1 WO2022077721 A1 WO 2022077721A1
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WO
WIPO (PCT)
Prior art keywords
support
grooves
bending
groove
equal
Prior art date
Application number
PCT/CN2020/132750
Other languages
English (en)
French (fr)
Inventor
汪文强
Original Assignee
武汉华星光电半导体显示技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US17/266,595 priority Critical patent/US11823595B2/en
Publication of WO2022077721A1 publication Critical patent/WO2022077721A1/zh
Priority to US18/494,965 priority patent/US20240096245A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1615—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function
    • G06F1/1616—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1641—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being formed by a plurality of foldable display components
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1675—Miscellaneous details related to the relative movement between the different enclosures or enclosure parts
    • G06F1/1681—Details related solely to hinges
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/14—Mounting supporting structure in casing or on frame or rack
    • H05K7/1438—Back panels or connecting means therefor; Terminals; Coding means to avoid wrong insertion

Definitions

  • the present application relates to the field of display technology, and in particular, to a support and a foldable display module.
  • a stainless steel sheet (metal sheet) is generally used as the support layer of the foldable display module, and the part of the stainless steel corresponding to the bending area is hollowed out to improve the bending ductility of the part of the support layer corresponding to the bending area.
  • the size of the stainless steel plate is relatively thick to ensure that the stainless steel plate can support the screen and transmit the rebound force of the module stack when it is bent and flattened, and it is beneficial for the screen to quickly return to a flat state.
  • the thicker stainless steel plate will directly increase the overall weight of the foldable display module. Simply reducing the thickness of the stainless steel plate may cause the stainless steel plate to be warped due to uneven stress. The warpage of the stainless steel plate is not conducive to the foldable display module. The group has good flatness.
  • the purpose of the present application is to provide a support and a foldable display module, the support and the foldable display module have lower weight and better flatness.
  • the present application provides a support member, the support member has at least one bending area and a plurality of non-bending areas, each of the bending areas is connected to two opposite non-bending areas In between, the support includes:
  • a support frame the support frame has a first surface and a second surface disposed opposite to each other in the thickness direction of the support member, and the first surface of the part of the support frame corresponding to the non-bending area is provided with multiple a plurality of second grooves are provided on the second surface of the part of the support frame corresponding to the non-bending area.
  • a plurality of the first grooves are arranged on the first surface in an array, and a plurality of the second grooves are arranged on the second surface in an array,
  • One of the first grooves corresponds to one of the second grooves, and the orthographic projection of each of the first grooves on the second surface is the same as the second groove when the support is in a flattened state.
  • the grooves are all coincident.
  • the sum of the depth of each of the first grooves and the depth of the second grooves corresponding to the first grooves is smaller than the thickness of the support member, and the support frame corresponds to The thickness of the part between the first groove and the second groove corresponding to the first groove is greater than or equal to the depth of the first groove, and the support frame corresponds to the first groove.
  • the thickness of a portion between a groove and the second groove corresponding to the first groove is greater than or equal to the depth of the second groove.
  • the depth of each of the first grooves is the same as the depth of each of the second grooves, and the support frame corresponds to the first groove and to the first groove
  • the thickness of the provided portion between the second grooves is equal to the depth of the first grooves.
  • a plurality of the first grooves and a plurality of the second grooves are arranged in an array along the length direction and the width direction of the support member,
  • any two adjacent first grooves disposed along the length direction of the support and any two adjacent first grooves disposed along the width direction of the support is equal to the first spacing;
  • any two adjacent second grooves disposed along the length direction of the support and any two adjacent second grooves disposed along the width direction of the support are all equal to the second pitches, and the first pitches are equal to the second pitches.
  • the first distance is greater than or equal to 6 mm
  • the second distance is greater than or equal to 6 mm.
  • the distance between the plurality of first grooves close to the edges of the support frame and the corresponding edges of the support frame is greater than or equal to any two phases in the same non-bending area. The spacing between adjacent said first grooves.
  • the shape of the cross-section of the plurality of first grooves is the same as or similar to the shape of each of the non-bending regions
  • the shape of the cross-section of the plurality of second grooves is the same as or similar to that of each of the non-bending regions.
  • the shapes of each of the non-bending regions are the same or similar.
  • the cross-sectional shapes of the first groove and the second groove include at least one of square, rectangle and circle.
  • each of the opposite ends of the support frame has two first corners, and a side surface of each of the first corners is provided with a first arc surface.
  • each of the first grooves has four second corners, and a side surface of each of the second corners is provided with a second arc surface;
  • Each of the second grooves has four third corners, and the side surface of each of the third corners is provided with a third arc surface;
  • the second arc surface of the second corner close to the first corner is concentric with the first arc surface corresponding to the first corner;
  • the third arc surface of the third corner close to the first corner is concentric with the first arc surface corresponding to the first corner.
  • a plurality of the first grooves and the plurality of the second grooves are filled with a plastic layer.
  • the preparation material of the plastic layer is a hard resin.
  • the preparation material of the support frame includes metal.
  • a part of the support frame corresponding to the bending area is provided with a plurality of through holes penetrating the thickness direction of the support, and the plurality of through holes are symmetrically arranged with respect to the bending axis of the support , and any two adjacent through holes are staggered in the direction perpendicular to the bending axis, the length direction of each through hole is parallel to the bending axis, and the width direction of each through hole is parallel to the bending axis.
  • the bending axis is vertical,
  • the pattern corresponding to the cross section of each of the through holes includes two U-shaped segments with opposite and symmetrical openings and two circular arc segments connecting the two U-shaped segments, each of the circular arc segments connecting two The U-shaped segments are at the same end, and the openings of the two arc segments are opposite to each other.
  • the arc corresponding to each of the circular arc segments is 120°-150°.
  • the distance between two adjacent through holes is greater than 0 micrometers and less than or equal to 100 micrometers; the width of each of the through holes is greater than 0 micrometers and less than or equal to 200 microns.
  • the length of each of the through holes is greater than or equal to 3.7 mm.
  • the distance between two adjacent through holes is greater than or equal to 60 microns; the width of each of the through holes is greater than or equal to 120 microns; The length of each of the through holes is less than or equal to 5.7 mm.
  • a foldable display module comprising:
  • the adhesive layer is disposed between the flexible display panel and the support member.
  • the present application provides a support and a foldable display module.
  • the support has at least one bending area and a plurality of non-bending areas. Each bending area is connected between two opposite non-bending areas. It includes a support frame, the support frame has a first surface and a second surface oppositely arranged in the thickness direction of the support member, the first surface of the part of the support frame corresponding to the non-bending area is provided with a plurality of first grooves, and the support frame corresponds to The second surface of the portion of the non-bending area is provided with a plurality of second grooves.
  • the first groove and the second groove are respectively provided on the opposite surfaces of the part of the support frame corresponding to the non-bending area in the thickness direction of the support member, thereby reducing the weight of the support member and improving the stress distribution of the support frame. All cause the support to warp.
  • FIG. 1 is a schematic diagram of a foldable display module according to an embodiment of the present application.
  • Figure 2 is a schematic plan view of the support shown in Figure 1;
  • Figure 3 is a schematic cross-sectional view along the tangent line B-B of the support member shown in Figure 2;
  • Fig. 4 is the schematic diagram that the groove is arranged on one surface of the support member
  • Fig. 5 is a partial enlarged schematic view of the non-bending area of the support member shown in Fig. 2;
  • Fig. 6 is the partial enlarged schematic diagram of the bending area of the support member shown in Fig. 2;
  • FIG. 1 is a schematic diagram of a foldable display module according to an embodiment of the present application.
  • the foldable display module 100 includes a flexible display panel 10 , a support member 20 and an adhesive layer 30 .
  • the flexible display panel 10 includes a backplane, a flexible organic light emitting diode display panel, a polarizer, and a protective cover that are stacked in sequence.
  • the backplane is located on the side close to the support member 20, and a transparent adhesive layer is passed between any two adjacent functional layers (any one of the backplane, the flexible organic light emitting diode display panel, the polarizer and the protective cover). bonding.
  • the flexible organic light emitting diode display panel is used to emit visible light, and the flexible organic light emitting diode display panel has the characteristic of being foldable.
  • the adhesive layer 30 is an optical adhesive layer.
  • the supporting member 20 is attached to the flexible display panel 10 through the adhesive layer 30, and the characteristics of the adhesive layer 30, such as low modulus, high elasticity, and stress resistance, can effectively slow down the supporting member 20 when the foldable display module is bent.
  • the stress is transferred to protect the functional layers in the flexible display panel 10 .
  • FIG. 2 is a schematic plan view of the support member shown in FIG. 1
  • FIG. 3 is a schematic cross-sectional view along the tangent line B-B of the support member shown in FIG. 2
  • the supporter 20 supports the flexible display panel 10 .
  • the support member 20 is used to improve the bending recovery force of the foldable display module in a bent state and the flatness in a flattened state.
  • the support 20 has at least one bending area 20a and a plurality of non-bending areas 20b, and each bending area 20a is connected between two opposite non-bending areas 20b.
  • the bending area 20a of the support member 20 is the same as the bending area of the foldable display module 100
  • the non-bending area 20b of the supporting member 20 is the same as the non-bending area of the foldable display module 100 .
  • the support member 20 has a bending area 20a and two non-bending areas 20b, and the two non-bending areas 20b are symmetrically connected to opposite sides of the bending area 20a.
  • the shape of the two non-bending areas 20b is and size are the same. It can be understood that the number of bending regions 20a may also be two, and correspondingly, the number of non-bending regions 20b is three.
  • the support member 20 includes a support frame 201 and a plastic layer 202 .
  • the support frame 201 has a first surface 201 a and a second surface 201 b disposed opposite to each other in the thickness direction of the support member 20 .
  • a plurality of first grooves 2011 are formed on the first surface 201a of the part of the support frame 201 corresponding to the non-bending area 20b, and a plurality of second grooves are formed on the second surface 201b of the part of the supporting frame 201 corresponding to the non-bending area 20b 2012.
  • FIG. 4 is a schematic diagram of arranging grooves on one surface of the support.
  • etching grooves on one surface of the support will cause the support to warp.
  • the main reason is that the etching of the grooves on one surface of the support will cause uneven distribution of residual stress in the support and cause warping.
  • the first groove and the second groove are respectively provided on two opposite surfaces of the part of the support frame of the support member corresponding to the non-bending area, so as to reduce the weight of the support frame, so that the support member The weight of the foldable display module is reduced, which is beneficial to reduce the weight of the foldable display module.
  • the two opposite surfaces of the support frame are respectively provided with the first groove and the second groove, the stress distribution of the two opposite surfaces of the support frame tends to be the same, so as to avoid the warpage caused by the concentration of residual stress on one side of the support frame, so that the The support member has better flatness, so that the foldable display module has good flatness.
  • a plurality of first grooves 2011 are arranged in an array on the first surface 201a, so that the stress distribution of the first surface 201a of the support frame 201 is more uniform; a plurality of second grooves 2012 are arranged in an array on the second surface 201b, so that the The stress distribution of the two surfaces 201b is more uniform.
  • the plurality of first grooves 2011 and the plurality of second grooves 2012 are arranged in an array along the length direction and the width direction of the support member 20 .
  • FIG. 5 is a partial enlarged schematic view of the non-bending area of the support member shown in FIG. 2 .
  • a plurality of first grooves 2011 are arranged in an array on the first surface 201a of the portion of the support frame 201 corresponding to each non-bending region 20b.
  • any two adjacent first grooves 2011 provided along the length direction of the support member 20 and any two adjacent first grooves 2011 provided along the width direction of the support member 20 The distance between them is equal to the first distance B1, so as to further ensure that the stress distribution of the first surface 201a of the support frame 201 is more uniform.
  • a plurality of second grooves 2012 are disposed on the second surface 201b of the supporting frame 201 corresponding to a portion of each non-bending area 20b in an array.
  • any two adjacent second grooves 2012 disposed along the length direction of the support member 20 and any two adjacent second grooves 2012 disposed along the width direction of the support member 20 The distance between them is equal to the second distance B2, so as to further ensure that the stress distribution of the second surface 201b of the support frame 201 is more uniform.
  • the first distance B1 is greater than or equal to 6 mm
  • the second distance B2 is greater than or equal to 6 mm, which is beneficial to ensure the overall rigidity and supportability of the support frame 201 .
  • the first pitch B1 is 6 mm, 7 mm, 8 mm, 9 mm and 15 mm
  • the second pitch B2 is 6 mm, 7 mm, 8 mm, 9 mm and 15 mm.
  • One first groove 2011 corresponds to one second groove 2012, and the orthographic projection of each first groove 2011 on the second surface 201b when the support 20 is in a flattened state completely coincides with the second groove 2012.
  • a distance B1 is equal to the second distance B2, so that the first groove 2011 of the first surface 201a and the second groove 2012 of the second surface 201b are arranged symmetrically up and down, which is more conducive to supporting the first surface 201a and the second surface of the skeleton 201
  • the stress distribution of 201b tends to be the same, which is beneficial to avoid warping of the support frame 201, so that the support member 20 has good flatness.
  • all coincidence means that the pattern corresponding to the cross section of the first groove 2011 is exactly the same in shape and size as the pattern corresponding to the cross section of the second groove 2012 .
  • first grooves 2011 and the second grooves 2012 can also be staggered up and down, and the first grooves 2011 and the second grooves 2012 are symmetrically arranged up and down relative to the first grooves 2011 and the second grooves 2012.
  • the staggered arrangement can ensure that the stress on the support member 20 is more uniformly distributed, thereby preventing the support member 20 from warping.
  • the third distance B3 between the plurality of first grooves 2011 near the edges of the supporting frame 201 and the corresponding edges of the supporting frame 201 is greater than or equal to the distance between any two adjacent first grooves 2011 in the same non-bending area 20b
  • the first distance B1 between them is to improve the supportability of the edge of the first surface 201a of the support member 20 and the flatness during the bending process. Since the second grooves 2012 and the first grooves 2011 are arranged symmetrically up and down, the distance between the plurality of second grooves 2012 close to the edges of the support frame 201 and the corresponding edges of the support frame 201 is also equal to the third distance B3.
  • the third spacing B3 is greater than or equal to 6 mm and less than or equal to 10 mm. If the third distance B3 is too small, the rigidity of the edge of the support member 20 during the bending process of the foldable display module 100 is small, which will cause the support member 20 to warp, and the edge of the support member 20 has poor support; the third distance If B3 is too large, the weight of the support member 20 will be increased, which is not conducive to reducing the weight of the foldable display module 100 .
  • the thickness of the support member 20 is 120 ⁇ m to 180 ⁇ m, so as to ensure that the support member 20 has a good bending recovery force, and to avoid the support member 20 from being heavy.
  • the thickness of the support 20 is 130 microns, 140 microns, 150 microns and 155 microns.
  • the sum of the depth H1 of each first groove 2011 and the depth H2 of the second groove 2012 corresponding to the first groove 2011 is smaller than the thickness of the support member 20 .
  • the thickness H3 of the part between the second grooves 2012 corresponding to the grooves 2011 is greater than or equal to the depth H1 of the first groove and the depth H2 of the second groove, so as to ensure that the support frame 201 is provided with the first groove 2011 and the depth H2 of the second groove.
  • the rigidity of the part of the second groove 2012 avoids that the thickness of the part of the support frame 201 provided with the first groove 2011 and the second groove 2012 is too thin, resulting in poor bending recovery force of the support 20 during the bending process.
  • the depth H1 of each first groove 2011 is the same as the depth H2 of each second groove 2012
  • the support frame 201 corresponds to the first groove 2011 and the second groove corresponding to the first groove 2011
  • the thickness H3 of the part between 2012 is equal to the depth H1 of the first groove 2011, so that the stress distribution of the support frame 201 in the thickness direction of the support member 20 is uniform while ensuring the bending restoring force of the support member 20,
  • the weight of the support member 20 is minimized, and the manufacturing process of the support member 20 is also facilitated.
  • the depth H1, the depth H2, and the thickness H3 may all be 50 microns.
  • the part of the support corresponding to the non-bending area is processed by double-sided simultaneous dry etching, and a constant temperature aging treatment is used after processing to prepare a support skeleton, so as to avoid uneven distribution of residual stress in the local structure caused by single-sided etching of the support Causes warpage in the overall surface.
  • the constant temperature is 190°C-210°C and the time is 22h-26h. Specifically, for example, the constant temperature is 200° C. and the time is 24 hours.
  • Each of the opposite ends of the support frame 201 has two first corners, and the side surface of each first corner is provided with a first arc surface 2014. Since the arc surface is more conducive to stress dispersion than the right-angle surface, it can avoid The support frame 201 is warped due to stress concentration at the first corner.
  • Each first groove 2011 has four second corners, and the side surface of each second corner is provided with a second arc surface 2011a; each second groove 2012 has four third corners, each of which is The side is provided with a third arc surface.
  • the second arc surface 2011a of the second corner close to the first corner is concentric with the first arc surface 2014 corresponding to the first corner, further avoiding warping at the first corner of the support frame 201; close to the first corner
  • the third arc surface of the third corner is coaxial with the first arc surface 2014 corresponding to the first corner, which further avoids warping at the first corner of the support frame 201 .
  • the shape of the cross section of the plurality of first grooves 2011 is the same or similar to the shape of each non-bending area 20b, and the shape of the cross section of the plurality of second grooves 2012 is the same as the shape of each non-bending area 20b Or similarly, the first groove 2011 and the second groove 2012 are adapted to the shape of the non-bending area 20b, so as to further prevent the supporting frame 201 from warping.
  • the shape of the cross section of the first groove 2011 and the second groove 2012 includes at least one of square, rectangle, and circle.
  • the shape of the cross section of the first groove 2011 includes four straight segments 20111 and four first arc segments 20112, and two adjacent straight segments 20111 pass through a first circle
  • the arc segments 20112 are connected, the lengths of the four straight line segments 20111 are the same, and the four first circular arc segments 20112 are the same.
  • the shape of the cross-section of the first groove 2011 is a shape corresponding to a square with rounded corners.
  • the shape of the cross section of the second groove 2012 is the same as the shape of the cross section of the first groove 2011 .
  • the shape of each non-bending area 20b is the shape corresponding to two square rounded corners, and the corresponding circular arc after the right-angled rounded corners is located outside the support member 20 .
  • the same shape means that the shape of the non-bending region 20b is exactly the same as the shape of the first groove 2011, for example, both are square or rectangular. Similar in shape means that the shape of the non-bending area 20b and the shape of the first groove 2011 are approximately the same, for example, the shape of the non-bending area 20b is a square, and the shape of the first groove 2011 is a square corresponding to a right-angled chamfer. ; Or the shape of the non-bending area 20b is a square with partially rounded right angles, and the shape of the first groove 2011 is a square or a square with all four right angles rounded.
  • the plurality of first grooves 2011 and the plurality of second grooves 2012 are filled with a plastic layer 202 , and the plastic layer 202 fills each of the first grooves 2011 and each of the second grooves 2012 , so as to It is ensured that the supporting member 20 has good flatness as a whole.
  • the preparation material of the plastic layer 202 is a hard resin, so that the plastic layer 202 has a certain hardness, so that the plastic layer 202 is used to replace the part of the supporting frame to reduce the overall weight of the support member 20, and at the same time, the plastic layer 202 can provide supporting strength .
  • Hard resins include, but are not limited to, plexiglass and hard phenolic.
  • the preparation material of the support frame 201 includes metal, and the preparation material of the support frame is stainless steel, so that the support has good bending recovery force and good support.
  • the allowable stress of stainless steel material selection is greater than or equal to 1600MPa, for example, the allowable stress of stainless steel material selection is 1700MPa, 1800MPa and so on.
  • FIG. 6 is a partial enlarged schematic view of the bending area of the support shown in FIG. 2 .
  • the part of the support frame 201 corresponding to the bending area 20 a is provided with a plurality of through holes penetrating the thickness direction of the support 20 .
  • Holes 2013, a plurality of through holes 2013 are symmetrically arranged about the bending axis A-A of the support 20, and any two adjacent through holes 2013 are arranged staggered in the direction perpendicular to the bending axis A-A, and the length direction of each through hole 2013 is related to the bending axis A-A is parallel, and the width direction of each through hole 2013 is perpendicular to the bending axis A-A.
  • the portion of the support frame 201 corresponding to the bending area 20a is provided with a plurality of through holes 2013 penetrating the thickness direction of the support member 20 to change the continuity of the metal support structure on the entire surface of the support frame 201 and effectively reduce the tensile modulus of the overall structure of the support frame 201 , to improve the ductility of the bending region 20a of the support member 20 .
  • each through hole 2013 includes two U-shaped segments 2013a with opposite and symmetrical openings and two second circular arc segments 2013b connecting the two U-shaped segments 2013a, each second circular arc segment 2013b
  • the same ends of the two U-shaped segments 2013a are connected, and the openings of the two second arc segments 2013b are opposite to each other.
  • the two U-shaped segments 2013a are transitionally connected by the second circular arc segment 2013b, so as to reduce the phenomenon of stress concentration caused by the structural sudden change of the U-shaped segment 2013a under the action of the external force of the through hole 2013 .
  • the stress is mainly concentrated on the vertex D of the U-shaped segment 2013a and the position near the vertex D, and the stress at the vertex D and the position near the vertex D will cause the through hole 2013 to break. invalid.
  • the radian corresponding to each second circular arc segment 2013b is 120 degrees-150 degrees, and the radian corresponding to the second circular arc segment 2013b is less than 120 degrees or greater than 150 degrees, which will cause the through hole 2013 to stretch during the deformation process. , the stress concentrated on the vertex D of the U-shaped segment 2013a and the position near the vertex D is too large, which increases the risk of fracture failure of the through hole 2013 .
  • the radian corresponding to each second circular arc segment 2013b may be 120 degrees, 140 degrees and 145 degrees.
  • each through hole 2013 is greater than the distance B4 between two adjacent through holes 2013 in the direction perpendicular to the bending axis A-A, and the width B5 of each through hole 2013 is smaller than the length L of each through hole 2013, In order to reduce the maximum stress of the vertex D of the U-shaped segment 2013a of the through hole 2013 and the position near the vertex D during the bending process of the support member 20 .
  • the distance B4 between two adjacent through holes 2013 is greater than 0 microns and less than or equal to 100 microns, and the width B5 of each through hole 2013 is greater than 0 microns and less than or equal to 200 ⁇ m, so as to reduce the maximum stress on the vertex D of the U-shaped segment 2013a of the through hole 2013 and the position near the vertex D during the bending process, and reduce the risk of failure of the support 20 .
  • each through hole 2013 is greater than or equal to 3.7 mm, so as to further reduce the maximum stress that the vertex D of the U-shaped section 2013a of the through hole 2013 and the positions near the vertex D are subjected to during the bending process.
  • the bending fatigue limit value can be taken as 800MPa as a reference. Equal to 3.7 mm is beneficial to reduce the risk of fracture failure of the support, and width B5 less than or equal to 200 ⁇ m is beneficial to reduce the risk of fracture failure of the support.
  • the distance B4 between two adjacent through holes 2013 is greater than or equal to 60 microns, so as to avoid that the distance B4 is too small and the part of the support frame 201 corresponding to the bending area is too soft and lost.
  • the maximum stress during the bending process is small while adapting to the process accuracy and ensuring that the vertex D of the U-shaped section 2013a of the through hole 2013 and the position near the vertex D are in the bending process to ensure that the supporting frame 201 corresponds to The balance between the supportability and the bending recovery force of the part of the bending area and reducing the maximum stress of the part of the support frame 201 corresponding to the bending area during the bending process.
  • the width of each through hole 2013 is greater than or equal to 120 microns, so as to adapt to the process precision and ensure that the vertex D of the U-shaped section 2013a of the through hole 2013 and the position near the vertex D have less maximum stress during the bending process.
  • each through hole 2013 is less than or equal to 5.7 mm, so as to avoid that the length of the through hole 2013 is too large and the hollow area of the part of the support frame 201 corresponding to the bending area is too large, thereby causing the support frame 201 to lose support and bending recovery force.
  • the vertex D of the U-shaped section 2013a of the through hole 2013 and the position near the vertex D have a small maximum stress during the bending process, so as to ensure the supportability and bending recovery force of the part of the support frame 201 corresponding to the bending area.
  • the balance between the maximum stress in the bending process of the part corresponding to the bending area of the supporting frame 201 is reduced.
  • the distance B4 between two adjacent through holes 2013 may be 20 micrometers, 40 micrometers, 60 micrometers, or 80 micrometers.
  • the width B5 of each through hole 2013 may be 20 microns, 40 microns, 60 microns, 80 microns, 100 microns, 120 microns, 150 microns, 180 microns.
  • the length L of each through hole 2013 is 4 mm, 4.5 mm, 5 mm, 6 mm.
  • simulation experiments are carried out with the bending radius of the bending area 20a of the support 20 as 1.5 mm, and the effects of the distance B4, the width B5 and the length L on the vertex D of the U-shaped segment 2013a of the through hole 2013 and the vicinity of the vertex D are studied.
  • the influence of the maximum stress, the simulation results are shown in Table 1-Table 3.
  • the width B5 in Table 1 is 200 microns, and the length L is 3.7 mm;
  • the spacing B4 in Table 2 is 100 microns, and the length L is 3.7 mm;
  • the spacing B4 in Table 3 is 100 microns, and the width B5 is 200 microns.
  • the maximum stress when the spacing B4 changes by 20 microns, the maximum stress correspondingly changes by more than 100 MPa; when the width B5 changes from 20 microns to 50 microns, the maximum stress correspondingly changes by more than 100 MPa; when the length L changes from 0.5 mm to 0.7 mm, the maximum stress changes The stress corresponds to a change of 80MPa or more.
  • the distance B4 and the width B5 are the key factors that affect the maximum stress during the bending process at the vertex D and the vicinity of the vertex D of the U-shaped segment of the through hole, and the length L is the vertex D and the vicinity of the vertex D that affect the U-shaped segment of the through hole. Secondary factor for maximum stress during bending.
  • the non-bending area of the support is not provided with the first groove and the second groove and the bending area is the same as the support of this embodiment as a comparative example, and the support of the comparative example is the same as that of this embodiment.
  • the results of the comparison of the quality of the support and the bending resilience are shown in Table 4 below.
  • the thickness of the supporting member of the comparative example and the supporting member of this embodiment are both 150 microns, and the depths of the first groove and the second groove in this embodiment are both 50 microns, and the thickness of the plastic layer is 50 microns.

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Abstract

一种支撑件（20）及可折叠显示模组（100），支撑件（20）具有至少一个弯折区（20a）以及多个非弯折区（20b），每个弯折区（20a）连接于两个相对的非弯折区（20b）之间，支撑件（20）包括支撑骨架（201），支撑骨架（201）具有在支撑件（20）的厚度方向上相对设置的第一表面（201a）和第二表面（201b），支撑骨架（201）对应非弯折区（20b）的部分的第一表面（201a）和第二表面（201b）上分别设置有多个第一凹槽（2011）和多个第二凹槽（2012）。

Description

支撑件及可折叠显示模组 技术领域
本申请涉及显示技术领域，尤其涉及一种支撑件及可折叠显示模组。
背景技术
目前，一般会以不锈钢板(metal sheet)作为可折叠显示模组的支撑层，通过对不锈钢对应弯折区的部分进行镂空，以提高支撑层对应弯折区的部分的弯折延展性。另外，不锈钢板的尺寸相对较厚，以保证不锈钢板在弯折展平时能起到支撑屏幕并传递模组叠构回弹力的作用，且利于屏幕迅速回复平整状态。然而，较厚的不锈钢板将直接提升可折叠显示模组的总体重量，简单地减低不锈钢板的厚度可能导致不锈钢板受力不均而出现翘曲现象，不锈钢板翘曲不利于可折叠显示模组具有良好的平整度。
因此，有必要提出一种技术方案以保证不锈钢板作为支撑层时具有较低重量的同时，具有良好的平整性。
技术问题
本申请的目的在于提供一种支撑件及可折叠显示模组，支撑件和可折叠显示模组具有更小的重量以及更好的平整性。
技术解决方案
为实现上述目的，本申请提供一种支撑件，所述支撑件具有至少一个 弯折区以及多个非弯折区，每个所述弯折区连接于两个相对的所述非弯折区之间，所述支撑件包括：
支撑骨架，所述支撑骨架具有在所述支撑件的厚度方向上相对设置的第一表面和第二表面，所述支撑骨架对应所述非弯折区的部分的所述第一表面设置有多个第一凹槽，所述支撑骨架对应所述非弯折区的部分的所述第二表面设置有多个第二凹槽。
在上述支撑件中，多个所述第一凹槽阵列地设置于所述第一表面，多个所述第二凹槽阵列地设置于所述第二表面，
一个所述第一凹槽对应一个所述第二凹槽设置，且每个所述第一凹槽在所述支撑件处于展平状态时在所述第二表面的正投影与所述第二凹槽全部重合。
在上述支撑件中，每个所述第一凹槽的深度和与所述第一凹槽对应设置的所述第二凹槽的深度之和小于所述支撑件的厚度，所述支撑骨架对应所述第一凹槽和与所述第一凹槽对应设置的所述第二凹槽之间的部分的厚度大于或等于所述第一凹槽的深度，且所述支撑骨架对应所述第一凹槽和与所述第一凹槽对应设置的所述第二凹槽之间的部分的厚度大于或等于所述第二凹槽的深度。
在上述支撑件中，每个所述第一凹槽的深度与每个所述第二凹槽的深度相同，且所述支撑骨架对应所述第一凹槽和与所述第一凹槽对应设置的所述第二凹槽之间的部分的厚度等于所述第一凹槽的深度。
在上述支撑件中，多个所述第一凹槽和多个所述第二凹槽均沿所述支撑件的长度方向和宽度方向阵列设置，
在同一个所述非弯折区中，沿所述支撑件的长度方向设置的任意两个相邻所述第一凹槽和沿所述支撑件的宽度方向设置的任意两个相邻所述第一凹槽之间的间距均等于第一间距；
在同一个所述非弯折区中，沿所述支撑件的长度方向设置的任意两个相邻所述第二凹槽和沿所述支撑件的宽度方向设置的任意两个相邻所述第二凹槽之间的间距均等于第二间距，所述第一间距等于所述第二间距。
在上述支撑件中，所述第一间距大于或等于6毫米，所述第二间距大于或等于6毫米。
在上述支撑件中，多个靠近所述支撑骨架的边缘的所述第一凹槽与所述支撑骨架对应的边缘之间的间距大于或等于同一个所述非弯折区中任意两个相邻所述第一凹槽之间的间距。
在上述支撑件中，多个所述第一凹槽的横截面的形状与每个所述非弯折区的形状相同或相似，且多个所述第二凹槽的横截面的形状与每个所述非弯折区的形状相同或相似。
在上述支撑件中，所述第一凹槽和所述第二凹槽的横截面的形状包括正方形、矩形、圆形中的至少一种。
在上述支撑件中，所述支撑骨架相对的两端中每一端均具有两个第一转角，每个所述第一转角的侧面设置有第一圆弧面。
在上述支撑件中，每个所述第一凹槽具有四个第二转角，每个所述第二转角的侧面设置有第二圆弧面；
每个所述第二凹槽具有四个第三转角，每个所述第三转角的侧面设置 有第三圆弧面；
靠近所述第一转角的所述第二转角的所述第二圆弧面与对应所述第一转角的所述第一圆弧面同轴心；
靠近所述第一转角的所述第三转角的所述第三圆弧面与对应所述第一转角的所述第一圆弧面同轴心。
在上述支撑件中，多个所述第一凹槽和多个所述第二凹槽中填充有塑料层。
在上述支撑件中，所述塑料层的制备材料为硬质树脂。
在上述支撑件中，所述支撑骨架的制备材料包括金属。
在上述支撑件中，所述支撑骨架对应所述弯折区的部分设置有贯穿所述支撑件厚度方向上的多个通孔，多个所述通孔关于所述支撑件的弯曲轴线对称设置，且在垂直于所述弯曲轴线方向上任意相邻两个所述通孔交错设置，每个所述通孔的长度方向与所述弯曲轴线平行，每个所述通孔的宽度方向与所述弯曲轴线垂直，
每个所述通孔的横截面对应的图案包括两个开口相对且对称设置的U形段以及连接两个所述U形段的两个圆弧段，每个所述圆弧段连接两个所述U形段的同一端，且两个所述圆弧段的开口相对。
在上述支撑件中，每个所述圆弧段对应的弧度为120度-150度。
在上述支撑件中，在垂直于所述弯曲轴线的方向上，相邻两个所述通孔之间的间距大于0微米且小于或等于100微米；每个所述通孔的宽度大于0微米且小于或等于200微米。
在上述支撑件中，每个所述通孔的长度大于或等于3.7毫米。
在上述支撑件中，在垂直于所述弯曲轴线的方向上，相邻两个所述通孔之间的间距大于或等于60微米；每个所述通孔的宽度大于或等于120微米；每个所述通孔的长度小于或等于5.7毫米。
一种可折叠显示模组，所述可折叠显示模组包括：
柔性显示面板；
上述支撑件；以及
胶粘层，所述胶粘层设置于所述柔性显示面板和所述支撑件之间。
有益效果
本申请提供一种支撑件及可折叠显示模组，支撑件具有至少一个弯折区以及多个非弯折区，每个弯折区连接于两个相对的非弯折区之间，支撑件包括支撑骨架，支撑骨架具有在支撑件的厚度方向上相对设置的第一表面和第二表面，支撑骨架对应非弯折区的部分的第一表面设置有多个第一凹槽，支撑骨架对应非弯折区的部分的第二表面设置有多个第二凹槽。通过支撑骨架对应非弯折区的部分的相对的两个表面在支撑件的厚度方向上分别设置第一凹槽和第二凹槽，减轻支撑件的重量的同时，改善支撑骨架的应力分布不均引起支撑件翘曲的现象。
附图说明
图1为本申请实施例可折叠显示模组的示意图；
图2为图1所示支撑件的平面示意图；
图3为沿图2所示支撑件B-B切线的截面示意图；
图4为在支撑件的一个表面设置凹槽的示意图；
图5为图2所示支撑件的非弯折区的局部放大示意图；
图6为图2所示支撑件的弯折区的局部放大示意图；
图7为弯折半径为R＝1.5毫米的支撑件的弯折区的应力仿真云图。
本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
请参阅图1，其为本申请实施例可折叠显示模组的示意图。可折叠显示模组100包括柔性显示面板10、支撑件20以及胶粘层30。
柔性显示面板10包括依次叠置的背板、柔性有机发光二极管显示面板、偏光片以及保护盖板。其中，背板位于靠近支撑件20的一侧，任意两个相邻的功能层(背板、柔性有机发光二极管显示面板、偏光片以及保护盖板中的任意一者)之间通过透明胶层粘接。柔性有机发光二极管显示面板用于发出可见光，柔性有机发光二极管显示面板具有可折叠的特性。
胶粘层30为光学胶层。支撑件20通过胶粘层30与柔性显示面板10进行贴合，利用胶粘层30的低模量、高弹性、应力阻滞等特点，有效减缓可折叠显示模组弯折时支撑件20的应力传递，保护柔性显示 面板10中的功能层。
请参阅图2及图3，图2为图1所示支撑件的平面示意图，图3为沿图2所示支撑件B-B切线的截面示意图。支撑件20对柔性显示面板10起到支撑作用。支撑件20用于提高可折叠显示模组在弯折状态时的弯折回复力以及在展平状态时的平整性。
支撑件20具有至少一个弯折区20a以及多个非弯折区20b，每个弯折区20a连接于两个相对的非弯折区20b之间。支撑件20的弯折区20a与可折叠显示模组100的弯折区相同，支撑件20的非弯折区20b与可折叠显示模组100的非弯折区相同。具体地，支撑件20具有一个弯折区20a以及两个非弯折区20b，两个非弯折区20b对称地连接于弯折区20a的相对两侧，两个非弯折区20b的形状和尺寸均相同。可以理解的是，弯折区20a的数目也可以是2个，对应地，非弯折区20b的数目为3个。
支撑件20包括支撑骨架201以及塑料层202。支撑骨架201具有在支撑件20的厚度方向上相对设置的第一表面201a和第二表面201b。支撑骨架201对应非弯折区20b的部分的第一表面201a设置有多个第一凹槽2011，支撑骨架201对应非弯折区20b的部分的第二表面201b设置有多个第二凹槽2012。
请参阅图4，其为在支撑件的一个表面设置凹槽的示意图。由图4可知，在支撑件的一个表面蚀刻凹槽会导致支撑件出现翘曲，主要原因在于，支撑件的一个表面蚀刻凹槽会导致支撑件内残余应力分布不均引起翘曲现象。
本申请可折叠显示模组通过在支撑件的支撑骨架对应非弯折区的部分的相对两个表面上分别设置第一凹槽和第二凹槽，以减轻支撑骨架的重量，从而使得支撑件的重量减小，有利于减轻可折叠显示模组的重量。且由于支撑骨架的两个相对表面分别设置有第一凹槽和第二凹槽，使得支撑骨架的两个相对表面的应力分布趋于相同，避免支撑骨架单侧残留应力集中导致翘曲，使得支撑件具有更好的平整性，进而使得可折叠显示模组具有良好的平整性。
多个第一凹槽2011阵列地设置于第一表面201a，使得支撑骨架201的第一表面201a的应力分布更加均一化；多个第二凹槽2012阵列地设置于第二表面201b，使得第二表面201b的应力分布更加均一化。具体地，如图2所示，多个第一凹槽2011和多个第二凹槽2012均沿支撑件20的长度方向和宽度方向阵列设置。
如图3及图5所示，图5为图2所示支撑件的非弯折区的局部放大示意图。支撑骨架201对应每个非弯折区20b的部分的第一表面201a阵列地设置有多个第一凹槽2011。在同一个非弯折区20b中，沿支撑件20的长度方向设置的任意两个相邻第一凹槽2011和沿支撑件20的宽度方向设置的任意两个相邻第一凹槽2011之间的间距均等于第一间距B1，以进一步地保证支撑骨架201的第一表面201a的应力分布更加均一化。
支撑骨架201对应每个非弯折区20b的部分的第二表面201b阵列地设置有多个第二凹槽2012。在同一个非弯折区20b中，沿支撑件20的长度方向设置的任意两个相邻第二凹槽2012和沿支撑件20的宽度 方向设置的任意两个相邻第二凹槽2012之间的间距均等于第二间距B2，以进一步地保证支撑骨架201的第二表面201b的应力分布更加均一化。
第一间距B1大于或等于6毫米，第二间距B2大于或等于6毫米，有利于保证支撑骨架201的整体刚度以及支撑性。例如，第一间距B1为6毫米、7毫米、8毫米、9毫米以及15毫米，第二间距B2为6毫米、7毫米、8毫米、9毫米以及15毫米。
一个第一凹槽2011对应一个第二凹槽2012设置，且每个第一凹槽2011在支撑件20处于展平状态时在第二表面201b的正投影与第二凹槽2012全部重合，第一间距B1等于第二间距B2，使得第一表面201a的第一凹槽2011和第二表面201b的第二凹槽2012上下对称设置，更有利于支撑骨架201的第一表面201a和第二表面201b的应力分布趋于相同，有利于避免支撑骨架201发生翘曲，使得支撑件20具有良好的平整性。其中，全部重合是指第一凹槽2011的横截面对应的图案与第二凹槽2012的横截面对应的图案的形状、尺寸恰好相同。
可以理解的是，第一凹槽2011和第二凹槽2012也可以上下交错设置，第一凹槽2011和第二凹槽2012上下对称设置相对于第一凹槽2011和第二凹槽2012上下交错设置，更能保证支撑件20上的应力更加均一地分布，从而避免支撑件20发生翘曲。
多个靠近支撑骨架201的边缘的第一凹槽2011与支撑骨架201对应的边缘之间的第三间距B3大于或等于同一个非弯折区20b中任意两 个相邻第一凹槽2011之间的第一间距B1，以提高支撑件20的第一表面201a的边缘的支撑性以及弯折过程中的平整性。由于第二凹槽2012与第一凹槽2011上下对称设置，多个靠近支撑骨架201的边缘的第二凹槽2012与支撑骨架201对应的边缘之间的间距也等于第三间距B3。
具体地，第三间距B3大于或等于6毫米且小于或等于10毫米。第三间距B3如果太小，可折叠显示模组100弯折过程中支撑件20的边缘的刚度较小会导致支撑件20出现翘曲，且支撑件20的边缘支撑性较差；第三间距B3如果太大，会导致支撑件20的重量较大，不利于可折叠显示模组100的重量减轻。
由于支撑件20的厚度越大，则支撑件20的弯折回复力越好，然而，厚度大会导致支撑件20重量偏大。支撑件20的厚度为120微米-180微米，以保证支撑件20具有良好的弯折回复力，且避免支撑件20的重量较大。例如，支撑件20的厚度为130微米、140微米、150微米以及155微米。
每个第一凹槽2011的深度H1和与第一凹槽2011对应设置的第二凹槽2012的深度H2之和小于支撑件20的厚度，支撑骨架201对应第一凹槽2011和与第一凹槽2011对应设置的第二凹槽2012之间的部分的厚度H3大于或等于第一凹槽的深度H1以及第二凹槽的深度H2，以保证支撑骨架201设置有第一凹槽2011和第二凹槽2012的部分的刚度，避免支撑骨架201设置有第一凹槽2011和第二凹槽2012的部分的厚度过薄导致支撑件20在弯折过程中的弯折回复力较差。
具体地，每个第一凹槽2011的深度H1与每个第二凹槽2012的深度H2相同，且支撑骨架201对应第一凹槽2011和与第一凹槽2011对应设置的第二凹槽2012之间的部分的厚度H3等于第一凹槽2011的深度H1，以保证支撑件20的弯折回复力的同时，使得在支撑件20的厚度方向上支撑骨架201的应力分布具有均一性，且使得支撑件20的重量最小化，还有利于简化支撑件20的制程工艺。例如深度H1、深度H2以及厚度H3可以均为50微米。
本申请通过双面同时干刻蚀处理支撑件对应非弯折区的部分，并且加工后采用恒温时效处理，制备得到支撑骨架，以避免支撑件单面刻蚀导致局部结构产生残余应力分布不均引起整体面内出现翘曲现象。恒温温度为190℃-210℃且时间为22h-26h。具体地，例如恒温温度为200℃，时间为24h。
支撑骨架201相对的两端中每一端均具有两个第一转角，每个第一转角的侧面设置有第一圆弧面2014，由于弧形面相对于直角面更有利于应力的分散，能避免支撑骨架201在第一转角处出现应力集中而导致翘曲。
每个第一凹槽2011具有四个第二转角，每个第二转角的侧面设置有第二圆弧面2011a；每个第二凹槽2012具有四个第三转角，每个第三转角的侧面设置有第三圆弧面。靠近第一转角的第二转角的第二圆弧面2011a与对应第一转角的第一圆弧面2014同轴心，进一步地避免支撑骨架201的第一转角处发生翘曲；靠近第一转角的第三转角的第三圆弧面与对应第一转角的第一圆弧面2014同轴心，进一步地避 免支撑骨架201的第一转角处发生翘曲。
多个第一凹槽2011的横截面的形状与每个非弯折区20b的形状相同或相似，且多个第二凹槽2012的横截面的形状与每个非弯折区20b的形状相同或相似，使得第一凹槽2011和第二凹槽2012与非弯折区20b的形状相适应，进一步地避免支撑骨架201发生翘曲。第一凹槽2011和第二凹槽2012的横截面的形状包括正方形、矩形、圆形中的至少一种。
具体地，如图2及图5所示，第一凹槽2011的横截面的形状包括四个直线段20111以及四个第一圆弧段20112，相邻两个直线段20111通过一个第一圆弧段20112连接，四个直线段20111的长度相同，四个第一圆弧段20112相同。第一凹槽2011的横截面的形状为正方形的直角倒圆角后对应的形状。第二凹槽2012的横截面的形状与第一凹槽2011的横截面的形状相同。每个非弯折区20b的形状为正方形的两个直角倒圆角后对应的形状，且直角倒圆角后对应的圆弧位于支撑件20的外侧。
需要说明的是，形状相同是指非弯折区20b的形状和第一凹槽2011的形状完全一样，比如均为正方形或者长方形。形状相似是指非弯折区20b的形状和第一凹槽2011的形状接近相同，例如非弯折区20b的形状为正方形，第一凹槽2011的形状为正方形的直角倒角后对应的形状；或者非弯折区20b的形状为部分的直角倒圆角的正方形，第一凹槽2011的形状为正方形或四个直角均倒圆角的正方形。
如图3所示，多个第一凹槽2011和多个第二凹槽2012中填充有塑料 层202，塑料层202填充满每个第一凹槽2011和每个第二凹槽2012，以保证支撑件20整体具有良好的平整性。
塑料层202的制备材料为硬质树脂，以使得塑料层202具有一定的硬度，使得塑料层202用于替代支撑骨架的部分以减少支撑件20的整体重量的同时，塑料层202能提供支撑强度。硬质树脂包括但不限于有机玻璃以及硬质酚醛。
支撑骨架201的制备材料包括金属，支撑骨架的制备材料为不锈钢，使得支撑件具有良好的弯折回复力，且具有良好的支撑性。不锈钢的选材的许用应力大于或等于1600MPa，例如不锈钢的选材的许用应力为1700MPa、1800MPa等。
如图2及图6所示，图6为图2所示支撑件的弯折区的局部放大示意图，支撑骨架201对应弯折区20a的部分设置有贯穿支撑件20厚度方向上的多个通孔2013，多个通孔2013关于支撑件20的弯曲轴线A-A对称设置，且在垂直于弯曲轴线A-A方向上任意相邻两个通孔2013交错设置，每个通孔2013的长度方向与弯曲轴线A-A平行，每个通孔2013的宽度方向与弯曲轴线A-A垂直。支撑骨架201对应弯折区20a的部分设置有贯穿支撑件20厚度方向上的多个通孔2013，改变支撑骨架201整面金属支撑结构连续性，有效降低支撑骨架201整体结构的拉伸模量，提高支撑件20的弯折区20a的延展性。
每个通孔2013的横截面对应的图案包括两个开口相对且对称设置的U形段2013a以及连接两个U形段2013a的两个第二圆弧段2013b，每个第二圆弧段2013b连接两个U形段2013a的同一端，且两个第 二圆弧段2013b的开口相对。两个U形段2013a通过第二圆弧段2013b过渡连接，以减小通孔2013外力作用下U形段2013a的结构突变引起应力集中的现象。
需要说明的是，支撑件20在弯折过程中，应力主要集中在U形段2013a的顶点D及顶点D附近的位置处，顶点D及顶点D附近的位置处应力过大会导致通孔2013断裂失效。
在本实施例中，每个第二圆弧段2013b对应的弧度为120度-150度，第二圆弧段2013b对应的弧度小于120度或者大于150度会导致通孔2013拉伸变形过程中，集中于U形段2013a的顶点D及顶点D附近的位置的应力过大，增加通孔2013断裂失效的风险。每个第二圆弧段2013b对应的弧度可以为120度、140度以及145度。
每个通孔2013的宽度B5大于在垂直于弯曲轴线A-A的方向上相邻两个通孔2013之间的间距B4，且每个通孔2013的宽度B5小于每个通孔2013的长度L，以减小支撑件20在弯折过程中通孔2013的U形段2013a的顶点D及顶点D附近的位置的最大应力。
具体地，在垂直于弯曲轴线A-A的方向上，相邻两个通孔2013之间的间距B4大于0微米且小于或等于100微米，每个通孔2013的宽度B5大于0微米且小于或等于200微米，以降低通孔2013的U形段2013a的顶点D及顶点D附近的位置处在弯折过程中所受的最大应力，降低支撑件20失效的风险。
每个通孔2013的长度L大于或等于3.7毫米，以进一步地降低通孔2013的U形段2013a的顶点D及顶点D附近的位置处在弯折过程中 所受的最大应力。
当制备支撑骨架201的不锈钢的许用应力大于或等于1600MPa时，弯折疲劳极限值可取值为800MPa作为参考，间距B4小于或等于100微米有利于降低支撑件断裂失效风险，长度L大于或等于3.7毫米有利于降低支撑件断裂失效风险，宽度B5小于或等于200微米有利于降低支撑件断裂失效风险。
进一步地，在垂直于弯曲轴线A-A的方向上，相邻两个通孔2013之间的间距B4大于或等于60微米，避免间距B4太小导致支撑骨架201对应弯折区的部分太柔软而失去支撑性以及弯折回复力的同时，适应制程精度且保证通孔2013的U形段2013a的顶点D及顶点D附近的位置处在弯折过程中的最大应力较小，实现保证支撑骨架201对应弯折区的部分的支撑性以及弯折回复力与减小支撑骨架201对应弯折区的部分在弯折过程中所受最大应力之间的平衡。每个通孔2013的宽度大于或等于120微米，以适应制程精度且保证通孔2013的U形段2013a的顶点D及顶点D附近的位置处在弯折过程中的最大应力较小。每个通孔2013的长度小于或等于5.7毫米，避免通孔2013的长度太大导致支撑骨架201对应弯折区的部分的镂空区域太大进而导致支撑骨架201失去支撑性和弯折回复力，且保证通孔2013的U形段2013a的顶点D及顶点D附近的位置处在弯折过程中的最大应力较小，实现保证支撑骨架201对应弯折区的部分的支撑性以及弯折回复力与减小支撑骨架201对应弯折区的部分在弯折过程中所受最大应力之间的平衡。
相邻两个通孔2013之间的间距B4可以为20微米、40微米、60微米、80微米。每个通孔2013的宽度B5可以为20微米、40微米、60微米、80微米、100微米、120微米、150微米、180微米。每个通孔2013的长度L为4毫米、4.5毫米、5毫米、6毫米。
如图7所示，其为弯折半径为R＝1.5毫米的支撑件的弯折区的应力仿真云图。本申请通过以支撑件20的弯折区20a的弯折半径为1.5毫米进行仿真实验，研究间距B4、宽度B5以及长度L对通孔2013的U形段2013a的顶点D及顶点D附近处的最大应力的影响，仿真结果如表1-表3。其中，表1中宽度B5为200微米，且长度L为3.7毫米；表2中间距B4为100微米，且长度L为3.7毫米；表3中间距B4为100微米，且宽度B5为200微米。
表1间距B4与通孔的U形段的顶点D及顶点D附近位置处的最大应力的对应关系
Figure PCTCN2020132750-appb-000001
表2宽度B5与通孔的U形段的顶点D及顶点D附近位置处的最大应力的对应关系
Figure PCTCN2020132750-appb-000002
表3长度L与通孔的U形段的顶点D及顶点D附近位置处的最大应力的对应关系
长度L(毫米) 3 3.7 4.2 4.7 5.2 5.7
应力(MPa) 1020.2 820.3 756.3 682.1 602.3 523.6
由表1可知，宽度B5为200微米，且长度L为3.7毫米时，随着间距B4从60微米增加至160微米，通孔的U形段的顶点D及顶点D附近处的最大应力呈递增趋势，故在一定范围内，间距B4越小，则通孔的U形段的顶点D及顶点D附近处的最大应力越小。
由表2可知，间距B4为100微米，且长度L为3.7毫米时，随着宽度B5从120微米增加至300微米，通孔的U形段的顶点D及顶点D附近处的最大应力呈递增趋势，故在一定范围内，宽度B5越小，则通孔的U形段的顶点D及顶点D附近处的最大应力越小。
由表3可知，间距B4为100微米，且宽度B5为200微米时，随着长度L从3毫米增加至5.7毫米，通孔的U形段的顶点D及顶点D附近处的最大应力呈递减趋势，故在一定范围内，长度L越大，则通孔的U形段的顶点D及顶点D附近处的最大应力越小。
结合表1-表3可知，间距B4变化20微米时，最大应力对应变化100MPa以上；宽度B5变化20微米-50微米时，最大应力对应变化100MPa以上；长度L变化0.5毫米-0.7毫米时，最大应力对应变化80MPa以上。间距B4和宽度B5是影响通孔的U形段的顶点D及顶点D附近处在弯折过程中的最大应力的关键因素，长度L是影响通孔 的U形段的顶点D及顶点D附近处在弯折过程中的最大应力的次要因素。
另外，本申请还以支撑件的非弯折区不设置第一凹槽和第二凹槽且弯折区与本实施例的支撑件相同作为对比例，将对比例的支撑件与本实施例的支撑件的质量以及弯折回弹力进行对比的结果如下表4。其中，对比例的支撑件和本实施例的支撑件的厚度均为150微米，且本实施例中第一凹槽和第二凹槽的深度均为50微米，塑料层的厚度为50微米。
表4对比例支撑件与本实施例支撑件的质量以及弯折回弹力
  质量(g) 回弹力(N)
对比例 14.6 6.6
本实施例 8.1 6.35
由表4可知，本实施例支撑件的质量相对于对比例的支撑件的质量减小了44.5％，而本实施例的支撑件的回弹力相对于对比例支撑件的回弹力没有明显变化，表明通过在支撑件的相对两个表面对称的设置第一凹槽和第二凹槽且在第一凹槽和第二凹槽中填充塑料层，可以明显降低支撑件的重量而不影响支撑件的弯折回复力。
以上实施例的说明只是用于帮助理解本申请的技术方案及其核心思想；本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例的技术方案的范围。

Claims (20)

  1. 一种支撑件，其中，所述支撑件具有至少一个弯折区以及多个非弯折区，每个所述弯折区连接于两个相对的所述非弯折区之间，所述支撑件包括：
    支撑骨架，所述支撑骨架具有在所述支撑件的厚度方向上相对设置的第一表面和第二表面，所述支撑骨架对应所述非弯折区的部分的所述第一表面设置有多个第一凹槽，所述支撑骨架对应所述非弯折区的部分的所述第二表面设置有多个第二凹槽。
  2. 根据权利要求1所述的支撑件，其中，多个所述第一凹槽阵列地设置于所述第一表面，多个所述第二凹槽阵列地设置于所述第二表面，一个所述第一凹槽对应一个所述第二凹槽设置，且每个所述第一凹槽在所述支撑件处于展平状态时在所述第二表面的正投影与所述第二凹槽全部重合。
  3. 根据权利要求2所述的支撑件，其中，每个所述第一凹槽的深度和与所述第一凹槽对应设置的所述第二凹槽的深度之和小于所述支撑件的厚度，所述支撑骨架对应所述第一凹槽和与所述第一凹槽对应设置的所述第二凹槽之间的部分的厚度大于或等于所述第一凹槽的深度，且所述支撑骨架对应所述第一凹槽和与所述第一凹槽对应设置的所述第二凹槽之间的部分的厚度大于或等于所述第二凹槽的深度。
  4. 根据权利要求2所述的支撑件，其中，每个所述第一凹槽的深度与每个所述第二凹槽的深度相同，且所述支撑骨架对应所述第一凹槽和 与所述第一凹槽对应设置的所述第二凹槽之间的部分的厚度等于所述第一凹槽的深度。
  5. 根据权利要求2所述的支撑件，其中，多个所述第一凹槽和多个所述第二凹槽均沿所述支撑件的长度方向和宽度方向阵列设置，
    在同一个所述非弯折区中，沿所述支撑件的长度方向设置的任意两个相邻所述第一凹槽和沿所述支撑件的宽度方向设置的任意两个相邻所述第一凹槽之间的间距均等于第一间距；
    在同一个所述非弯折区中，沿所述支撑件的长度方向设置的任意两个相邻所述第二凹槽和沿所述支撑件的宽度方向设置的任意两个相邻所述第二凹槽之间的间距均等于第二间距，所述第一间距等于所述第二间距。
  6. 根据权利要求5所述的支撑件，其中，所述第一间距大于或等于6毫米，所述第二间距大于或等于6毫米。
  7. 根据权利要求2所述的支撑件，其中，多个靠近所述支撑骨架的边缘的所述第一凹槽与所述支撑骨架对应的边缘之间的间距大于或等于同一个所述非弯折区中任意两个相邻所述第一凹槽之间的间距。
  8. 根据权利要求1所述的支撑件，其中，多个所述第一凹槽的横截面的形状与每个所述非弯折区的形状相同或相似，且多个所述第二凹槽的横截面的形状与每个所述非弯折区的形状相同或相似。
  9. 根据权利要求1所述的支撑件，其中，所述第一凹槽和所述第二凹槽的横截面的形状包括正方形、矩形、圆形中的至少一种。
  10. 根据权利要求1所述的支撑件，其中，所述支撑骨架相对的两端中每一端均具有两个第一转角，每个所述第一转角的侧面设置有第一圆弧面。
  11. 根据权利要求10所述的支撑件，其中，每个所述第一凹槽具有四个第二转角，每个所述第二转角的侧面设置有第二圆弧面；
    每个所述第二凹槽具有四个第三转角，每个所述第三转角的侧面设置有第三圆弧面；
    靠近所述第一转角的所述第二转角的所述第二圆弧面与对应所述第一转角的所述第一圆弧面同轴心；
    靠近所述第一转角的所述第三转角的所述第三圆弧面与对应所述第一转角的所述第一圆弧面同轴心。
  12. 根据权利要求1所述的支撑件，其中，多个所述第一凹槽和多个所述第二凹槽中填充有塑料层。
  13. 根据权利要求12所述的支撑件，其中，所述塑料层的制备材料为硬质树脂。
  14. 根据权利要求1所述的支撑件，其中，所述支撑骨架的制备材料包括金属。
  15. 根据权利要求1所述的支撑件，其中，所述支撑骨架对应所述弯折区的部分设置有贯穿所述支撑件厚度方向上的多个通孔，多个所述通孔关于所述支撑件的弯曲轴线对称设置，且在垂直于所述弯曲轴线方向上任意相邻两个所述通孔交错设置，每个所述通孔的长度方向与所述弯曲轴线平行，每个所述通孔的宽度方向与所述弯曲轴线垂直， 每个所述通孔的横截面对应的图案包括两个开口相对且对称设置的U形段以及连接两个所述U形段的两个圆弧段，每个所述圆弧段连接两个所述U形段的同一端，且两个所述圆弧段的开口相对。
  16. 根据权利要求15所述的支撑件，其中，每个所述圆弧段对应的弧度为120度-150度。
  17. 根据权利要求15所述的支撑件，其中，在垂直于所述弯曲轴线的方向上，相邻两个所述通孔之间的间距大于0微米且小于或等于100微米；每个所述通孔的宽度大于0微米且小于或等于200微米。
  18. 根据权利要求17所述的支撑件，其中，每个所述通孔的长度大于或等于3.7毫米。
  19. 根据权利要求18所述的支撑件，其中，在垂直于所述弯曲轴线的方向上，相邻两个所述通孔之间的间距大于或等于60微米；每个所述通孔的宽度大于或等于120微米；每个所述通孔的长度小于或等于5.7毫米。
  20. 一种可折叠显示模组，其中，所述可折叠显示模组包括：
    柔性显示面板；
    如权利要求1所述的支撑件；以及
    胶粘层，所述胶粘层设置于所述柔性显示面板和所述支撑件之间。
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