WO2022262034A1 - 柔性显示模组 - Google Patents

柔性显示模组 Download PDF

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Publication number
WO2022262034A1
WO2022262034A1 PCT/CN2021/105909 CN2021105909W WO2022262034A1 WO 2022262034 A1 WO2022262034 A1 WO 2022262034A1 CN 2021105909 W CN2021105909 W CN 2021105909W WO 2022262034 A1 WO2022262034 A1 WO 2022262034A1
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WO
WIPO (PCT)
Prior art keywords
holes
flexible display
display module
support plate
along
Prior art date
Application number
PCT/CN2021/105909
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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
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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 US17/600,104 priority Critical patent/US20240045471A1/en
Publication of WO2022262034A1 publication Critical patent/WO2022262034A1/zh

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    • 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
    • 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
    • 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
    • G09F9/33—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 being semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/871—Self-supporting sealing arrangements
    • H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED

Definitions

  • the invention relates to the field of display technology, in particular to a flexible display module.
  • OLED Organic Light-Emitting Diode, Organic Light-Emitting Diode
  • display technology has been widely used in the mobile phone industry, and the application of medium and small size OLED panels in folding mobile phones has entered the commercialization stage.
  • the crease problem of folding mobile phones has not been effectively solved.
  • researchers in the industry have been working hard to find new solutions to make up for the technical shortcomings of folding mobile phones that cannot solve the crease problem of OLED screens in the short term.
  • the mobile phone screen can be stored and unfolded from small to large, and at the same time minimize the crease problem, the OLED technology of the scroll screen came into being.
  • the scroll screen must bear the stretching and curling stress of the scroll storage and unfolding action during use, so the screen is required to be well adapted to this stress environment to avoid debonding of the adhesive layer and film layer inside the module phenomenon, but also requires the screen to have good flatness when unfolded.
  • a thin stainless steel plate (SUS) is generally used as the module support layer for the bottom layer of the stacking.
  • SUS stainless steel plate
  • the thickness of SUS has strict size restrictions.
  • the thickness of SUS used in flexible OLED screen modules is within the range of 30-150um, and the bending radius of the screen is equal to that of the screen. Directly related, usually the smaller the radius, the smaller the thickness of the selected SUS, but after unfolding, the flatness recovery of the screen is poor.
  • the usual method is to design the thickness of the SUS within the range of 100-150um, pattern the SUS in the curling area, and use the method of removing the continuity of the material in the thickness direction of the SUS , reduce the modulus of elasticity in the bending direction, and improve the bendability.
  • this method still fails to effectively solve the problem of poor flatness recovery of the screen after it is rolled and unfolded.
  • Embodiments of the present invention provide a flexible display module to solve the technical problem of poor flatness recovery of existing rollable display modules from a rolled state to an unfolded state.
  • An embodiment of the present invention provides a flexible display module, including a flexible area.
  • the flexible display module includes a flexible display panel and a support assembly for supporting the flexible display panel, wherein the support assembly includes an adhesive layer, and A first support plate and a second support plate respectively located on two opposite sides of the adhesive layer; wherein, the first support plate includes a first flexible portion located in the flexible area, and the first flexible portion includes a plurality of first flexible portions A through hole, the second support plate includes a second flexible portion located in the flexible area, and the second flexible portion includes a plurality of blind holes on a side away from the first support plate.
  • a plurality of the first through holes are arranged along a first direction and a second direction intersecting the first direction, a plurality of the blind holes are arranged along the first direction, and the first through holes are arranged along the first direction.
  • a plane in which the first direction and the second direction lie is parallel to the surface of the support assembly, and the second direction is parallel to a roll axis or a bending axis.
  • the second direction is a row direction
  • the centerline of any row of the blind holes along the second direction is the same as that of one row of the first through holes along the second row.
  • the central lines of the directions coincide in the thickness direction of the adhesive layer.
  • the distance between the centerlines of two adjacent rows of blind holes along the second direction is equal to the centerlines of two adjacent rows of first through holes along the second direction twice the distance between.
  • the first support plate includes a first edge and a second edge perpendicular to and opposite to the second direction
  • the first flexible portion includes A plurality of second through holes arranged on the second edge, any second through hole intersects with its corresponding edge.
  • the second direction is a column direction
  • any of the second through holes is in the same column as at least one of the first through holes, and along the first edge or the second edge A plurality of the second through-holes arranged are arranged every other row of the first through-holes.
  • the centerline of any one of the blind holes along the second direction and the centerline of at least one second through hole along the second direction are in the thickness direction of the adhesive layer Overlap.
  • the bending inner radius of the support assembly is R
  • the maximum thickness of the first support plate is H 1
  • the thickness of the adhesive layer is H 2
  • the second support plate The maximum thickness of the blind hole is H 3
  • the width of the blind hole along the first direction is B 1
  • the distance between two adjacent blind holes arranged along the first direction is B 2
  • the second The width of the through hole along the first direction is C 1
  • the distance between two adjacent second through holes arranged along the first edge or the second edge is C 2
  • the maximum thickness of the second support plate is H 3
  • the depth of the blind hole is H 4
  • the ratio of H 4 to H 3 ranges from 0.4 to 0.5.
  • the second support plate includes a third edge on the same side as the first edge, a fourth edge on the same side as the second edge, and any of the blind holes penetrating through the third edge and the fourth edge along the second direction.
  • the shape of the second through hole is U-shaped.
  • the first direction is perpendicular to the second direction
  • the support assembly includes a symmetry axis parallel to the first direction, and the support assembly is symmetrical about the symmetry axis.
  • the first support plate further includes a plurality of third through holes arranged along the first direction and the second direction, and the third through holes are connected to the first through holes.
  • the holes are arranged alternately in the second direction.
  • the second direction is a row direction
  • the center line of any row of the third through holes along the second direction is the same as that of the first through holes in the same row along the second direction. centerlines coincide.
  • the distance between the adjacent third through holes and the first through holes in the same column is the maximum width of the first through holes in the first direction half of.
  • the second direction is a column direction
  • the first through holes in two adjacent columns are arranged in a staggered manner.
  • the second direction is a column direction, and the distance between two adjacent columns of the first through holes is equal to the maximum width of the first through holes in the first direction .
  • the ratio of the maximum length of the first through hole in the second direction to the maximum width of the first through hole in the first direction is 40-60.
  • the flexible display module further includes:
  • a backplane disposed between the flexible display panel and the support assembly
  • a polarizer disposed on a side of the flexible display panel away from the support assembly
  • the cover plate is arranged on the side of the polarizer away from the flexible display panel.
  • the flexible display panel is disposed on a side close to the first support plate of the support assembly.
  • the flexible display module provided by the present invention has the characteristics of good bending performance, good ductility, and high reliability, can improve the flatness of the flexible display module from a curled or bent state to a flattened state, and reduce the cost of the flexible display module. Risk of detachment of the internal membrane layers of the group.
  • FIG. 1 is a schematic diagram of a film layer stack structure of a flexible display module provided by an embodiment of the present invention.
  • Fig. 2 is a schematic diagram of the exploded structure of the support assembly provided by the embodiment of the present invention.
  • Fig. 3 is a schematic plan view of a first support plate provided by an embodiment of the present invention.
  • Fig. 4 is a schematic plan view of a second support plate provided by an embodiment of the present invention.
  • Fig. 5 is a schematic diagram of the film layer stack structure of the support assembly provided by the embodiment of the present invention.
  • Fig. 6 is a schematic structural diagram of a first support plate and a second support plate provided by an embodiment of the present invention.
  • Fig. 7 is a schematic plan view of a first support plate provided by another embodiment of the present invention.
  • Fig. 8 is a schematic cross-sectional view of a second support plate provided by an embodiment of the present invention.
  • Fig. 9 is a schematic diagram of the bending structure of the support assembly provided by the embodiment of the present invention.
  • Fig. 10 is a partial schematic diagram of the bending of the crimping region of the support assembly provided by the embodiment of the present invention.
  • Fig. 11 is a contour diagram of the bending stress of the support assembly provided by the embodiment of the present invention.
  • Fig. 12 is a graph showing the relationship between the ratio of the depth of the blind hole to the maximum thickness of the blind hole and the bending stress according to the embodiment of the present invention.
  • Fig. 13 is a graph showing the relationship between the ratio of the depth of the blind hole to the maximum thickness of the blind hole and the bending rebound force provided by the embodiment of the present invention.
  • an embodiment of the present invention provides a flexible display module to solve the above defects.
  • an embodiment of the present invention provides a flexible display module 100, including a flexible area FA, the flexible display module 100 includes a flexible display panel 40 and a support for supporting the flexible display panel 40 Component 10.
  • the flexible area FA can be deformed under the action of external force, and the deformation can be at least one of bending, folding, winding, and twisting.
  • the flexible display module 100 can specifically be a curling display module, which can be rolled and stored or unfolded around a scroll, and the flexible display module 100 can also be a folding display module, which can be folded along at least one bending axis. For bending, the flexible display module 100 can also have bending performance and winding performance at the same time.
  • the flexible display module 100 further includes a non-flexible area NFA located on one side of the flexible area NA, and the non-flexible area NFA does not deform under the action of external force.
  • the support assembly 10 includes a glue layer 13 and a first support plate 11 and a second support plate 12 located on opposite sides of the glue layer 13, wherein the first support plate 11 includes The first flexible part 1101, the first flexible part 1101 includes a plurality of first through holes 111, the second support plate 12 includes a second flexible part 1201, the second flexible part 1201 is away from the first support plate
  • One side of 11 includes a plurality of blind holes 121, the first flexible part 1101 and the second flexible part 1201 are located in the flexible area FA, that is, the plurality of first through holes 111 and the plurality of blind holes 121 are located in the flexible area FA. Bond the first support plate 11 and the second support plate 12 through the adhesive layer 13, and use the viscous damping effect and low modulus characteristics of the adhesive layer 13 to buffer and release the bending and curling stress of the upper and lower support plates role.
  • the support assembly 10 provided by the embodiment of the present invention can meet the bending and curling performance of the flexible display module 100, and the thicknesses of the first support plate 11 and the second support plate 12 are respectively optimized through simulation, which is sufficient for the flexible display panel.
  • the supporting force can also improve the flatness of the flexible display module when it is bent or curled and then restored to a flattened state.
  • the flatness of the rollable display module in the unfolded state is generally improved by simply increasing the thickness of the support plate, but this solution will cause excessive stress on the support plate itself, making the rollable display module difficult to bend as a whole , can also cause fracture behavior and the risk of layer separation.
  • the support assembly 10 of the flexible display module 100 provided in this embodiment is a composite structure, and its first support plate 11 and second support plate 12 have different pattern designs, which can not only improve the stability of the flexible display module in the unfolded state
  • the overall support stiffness can be improved to improve the flatness, and can also reduce the elastic modulus of the flexible area FA of the flexible display module, and improve the bending and curling performance.
  • the plurality of first through holes 111 are arranged along the first direction X and the second direction Y intersecting the first direction X, and the plurality of blind holes 121 are arranged along the first direction X Arranged, the plane where the first direction X and the second direction Y are located is parallel to the surface of the support assembly 10, and the second direction Y is parallel to a roll axis or a bending axis.
  • the flexible display module 100 has the function of curling, the flexible display module 100 is rolled or unfolded along the scroll axis; when the flexible display module 100 has the function of bending, the flexible display module The bending axis performs bending or unfolding.
  • the adhesive layer 13 is preferably a flexible adhesive layer 13, including but not limited to OCA adhesive.
  • the first support plate 11 and the second support plate 12 can be made of, but not limited to, stainless steel (SUS).
  • a through hole refers to a hole that penetrates the thickness of the film layer where it is located
  • a blind hole refers to a hole that does not completely penetrate the thickness of the film layer where it is located.
  • FIG. 1, FIG. 3-FIG. 5, the embodiment of the present invention is described by taking the flexible display module 100 including a flexible area FA with winding capability and a non-flexible area NFA located on one side of the flexible area FA as an example.
  • the part of the flexible display module 100 located in the flexible area FA can be rolled or flattened around a roll, so as to change the size of the display surface of the flexible display module 100 .
  • the support assembly 10 includes a crimped area 101 and a non-crimped area 102 located on one side of the crimped area 101, the crimped area 101 corresponds to the flexible area FA, the non-crimped area 102 corresponds to the non-flexible area NFA Correspondingly, the curling area 101 is used for curling or flattening around a roll.
  • the following structural description of the support assembly 10 is also applicable to a flexible display module that is bent or unfolded along a bending axis.
  • the first support plate 11 includes a first flexible portion 1101 and a first straight portion 1102
  • the second support plate 12 includes a second flexible portion 1201 and a second straight portion 1202
  • the first flexible portion 1101 and The second flexible portion 1201 is correspondingly located in the curled region 101
  • the first straight portion 1102 and the second straight portion 1202 are correspondingly located in the non-curled region 102 .
  • the first through hole 111 is located at the first flexible portion 1101 of the first supporting plate 11 corresponding to the crimping area 101
  • the blind hole 121 is located at the portion of the second supporting plate 12 corresponding to the crimping area 101
  • the second flexible part 1201 enables the support assembly 10 to support a rollable flexible display panel, and can improve the support strength of the flexible display panel while ensuring the bending and rolling performance of the curling region 101 .
  • the plurality of first through holes 111 are arranged along the first direction X and the second direction Y intersecting the first direction X, and the plurality of blind holes 121 are arranged along the first direction X.
  • a direction X is arranged, the planes of the first direction X and the second direction Y are parallel to the surface of the support assembly 10 , and the second direction Y is parallel to the scroll axis.
  • the plurality of blind holes 121 are arranged at equal intervals along the first direction X, and the plurality of first through holes 111 are arranged at equal intervals along the first direction X, and arranged at equal intervals along the second direction Y.
  • any row of the blind holes 121 along the center line L2 of the second direction Y is compatible with the plurality of rows of the first through holes 111 .
  • a row of centerlines L1 along the second direction Y overlaps in the thickness direction of the adhesive layer 13 .
  • the distance between the center line L2 of two adjacent rows of blind holes 121 along the second direction Y can be equal to the distance between two adjacent rows of first through holes 111 along the second direction Y. Twice the distance between the centerlines L1 in the second direction Y.
  • the blind holes 121 are arranged every other row of first through holes 111, and by rationally designing the distance between adjacent blind holes 121, it is possible to ensure The rigidity of the support assembly 10 can also ensure its bending and curling performance.
  • the first support plate 11 includes a first edge E1 and a second edge E2 perpendicular to and opposite to the second direction Y, and the first flexible portion 1101 It includes a plurality of second through holes 112 arranged along the first edge E1 and along the second edge E2, and any second through hole 112 intersects with its corresponding edge.
  • the shape of the second through hole 112 is U-shaped.
  • the plurality of through holes arranged along the first edge E1 and along the second edge E2 are equally spaced.
  • any of the second through holes 112 is in the same row as at least one of the first through holes 111 , and the center line of the second through hole 112 along the second direction Y is aligned with the center line of the second through hole 112 .
  • the center line L1 of the first through hole 111 is coincident, and the width of the second through hole 112 along the first direction X is equal to the width of the first through hole 111 .
  • the plurality of second through holes 112 arranged along the first edge E1 or the second edge E2 are arranged every other row of the first through holes 111 .
  • the first support plate 11 can be strengthened by arranging the second through holes 112 arranged along the edge every other row of first through holes 111, instead of designing a second through hole 112 at a position near the edge of each row of first through holes 111
  • the rigidity of the edge is conducive to the flatness design of the edge.
  • the centerline L2 of any one of the blind holes 121 along the second direction Y and the centerline of at least one second through hole 112 along the second direction Y are within The thickness direction of the supporting components 10 overlaps.
  • the first support plate 11 further includes a plurality of third through holes 113 arranged along the first direction X and the second direction Y, the first The three through holes 113 are arranged alternately with the first through holes 111 in the second direction Y.
  • the stress concentration phenomenon between the heads of the adjacent first through holes 111 can be reduced.
  • the centerline of any column of the third through holes 113 along the second direction Y coincides with the centerline L1 of the same column of the first through holes 111 along the second direction Y.
  • the distance between the adjacent third through holes 113 and the first through holes 111 in the same column is the distance between the first through holes 111 in the first direction X half of the maximum width of the .
  • the end of the through hole can be designed as an arc, so the width and length of the through hole at different positions will be different.
  • the through hole The width of the middle part of the hole will be larger than the width of the end part, and the length of the position of the center line of the through hole along the second direction Y will be greater than the length of the positions on both sides of the center line.
  • the through hole mentioned in the embodiment of the present invention is in the first
  • the maximum width in the direction X refers to the width of the middle of the through hole
  • the maximum length of the through hole along the second direction Y mentioned below refers to the length of the centerline of the through hole along the second direction Y.
  • the second support plate 12 includes a third edge E3 on the same side as the first edge E1 , a fourth edge E3 on the same side as the second edge E2 .
  • edge E4 any one of the blind holes 121 passes through the third edge E3 and the fourth edge E4 along the second direction Y.
  • the first direction X is perpendicular to the second direction Y, as shown in FIG. 2
  • the support assembly 10 includes a symmetry axis L3 parallel to the first direction X, and the support assembly 10 is about The axis of symmetry is symmetrical, so that the crimping region 101 of the supporting component 10 can keep the stress distribution uniform when it is bent and crimped.
  • the design of the support assembly 10 should satisfy the following relationship:
  • the bending inner radius of the support assembly 10 is R
  • the maximum thickness of the first support plate 11 is H 1
  • the thickness of the adhesive layer 13 is H 2
  • the maximum thickness of the second support plate 12 is H 3
  • the maximum thickness of the second support plate 12 refers to the thickness of the plate body avoiding the blind hole
  • the width of the blind hole 121 along the first direction X is B 1
  • the width of the second through hole 112 along the first direction X is C 1
  • the width of the second through hole 112 along the first direction X is C 1 .
  • the distance between two adjacent second through holes 112 is C 2 .
  • the second support plate 12 is closer to the center of the circle when the support plate assembly is bent relative to the first support plate 11, that is,
  • the bending inner radius R of the support assembly 10 refers to the distance between the center of the circle and the second support plate 12 when it is bent.
  • the values of R, H 1 , H 2 , and H 3 can be determined according to the actual design values, and C 1 and C 2 can be determined according to the hole width and hole spacing of the first through holes 111 on the first support plate 11 It is determined that under this condition, B 1 and B2 can be obtained according to the above formula and the size of the second flexible portion 1201 of the second support plate 12 .
  • Fig. 5 is the bending simulation cloud diagram of the support assembly 10 according to the embodiment of the present invention, by determining the bending radius R of the support assembly 10 and H 1 , H 2 , H 3 , C 1 , C 2 , B 1 , B2, by adjusting the ratio of the depth and thickness H4 of the blind hole 121 to the maximum thickness H3 of the second support plate, the bending stress of the support assembly 10 can be reduced to about 610MPa, which is far lower than the selected material
  • the failure strength is 1600MPa.
  • Fig. 12 is a relation diagram of the ratio of the depth H 4 and the maximum thickness H 3 of the blind hole 121 of the second support plate 12 to the bending stress
  • Fig. 13 is the blind hole 121 of the second support plate 12.
  • the relationship between the ratio of the depth H4 of the hole 121 to the maximum thickness H3 and the bending rebound support force specifically, under the premise of determining the structural size of the first support plate 11, by adjusting the ratio, a better bending can be obtained Rebound support and bending performance; combined with the above formula, the value range of each structural characteristic value of the upper and lower support plates can be gradually obtained, so as to obtain the optimal bending performance.
  • the preferred value range of the ratio of H 4 to H 3 in the embodiment of the present invention is 0.4-0.5, within this range, the bending stress reaches the optimal value range.
  • the first through holes 111 in two adjacent rows are arranged in a misalignment.
  • the first through holes 111 arranged in a misalignment can avoid local concentration of stress and are beneficial to the curling area. 101 bends, curls.
  • first through hole 111, the second through hole 112 and the third through hole 113 all extend along the second direction Y, that is, the through hole mentioned in this embodiment, which is in the second
  • the maximum length in the direction Y is larger than the maximum width in the first direction X.
  • the extension direction of each through hole is set to be parallel to the direction of the scroll axis, which is beneficial to improve the ductility of the first support plate 11 . More specifically, the ratio of the maximum length of the first through hole 111 in the second direction Y to the maximum width of the first through hole 111 in the first direction X is 40-60.
  • the distance between two adjacent rows of the first through holes 111 is equal to the maximum width of the first through holes 111 in the first direction X.
  • the distance between the adjacent first through holes 111 in the same row and the third through holes 113 depends on the length and width of the first through holes 111 in the actual design, and the distance between the two adjacent first through holes 111 in the same row. It depends on the design value of the spacing between them. In an embodiment of the present invention, the spacing between the adjacent first through holes 111 and the third through holes 113 in the same column is equal to the distance along the first through hole 111. half of the maximum width in the first direction X.
  • the widths of the first through hole 111 , the second through hole 112 and the third through hole 113 in the first direction X are the same.
  • the first through hole 111 and the second through hole 112 may be, but not limited to, elongated.
  • the ends of the first through hole 111 and the second through hole 112 can be designed as arcs, including but not limited to semi-ellipse, semi-circle and so on.
  • the maximum length of the first through hole 111 along the second direction Y is 4.5-6 mm, and the maximum width along the first direction X is 0.2-0.25 mm.
  • the distance between the first through holes 111 in two rows is 0.18-0.22 mm.
  • the geometric characteristic values of each through hole of the first support plate 11 can be adjusted according to the specific size, stack thickness and module composition of the screen module.
  • the bending radius value R of the display module under the condition that the bending radius value R of the display module is determined, combined with the characteristic values of each substructure of the first process board, the board thickness, the thickness value of the adhesive layer 13, and B 1 , B 2 , C 1 , C 2 satisfy the dimensional relationship to ensure that the upper and lower support plates can ensure the center-to-center alignment relationship of each substructure in both the flattened and bent states, and then adjust the ratio of H 4 to H 3 , In this way, the optimal bending performance of the support assembly 10 can be obtained, and the failure risk of the module can be reduced.
  • the flexible display panel 40 is arranged on the side close to the first support plate 11 of the support assembly 10. Since the support assembly 10 needs to be bonded with glue when it is bonded to the module, the bending During the folding process, the glue can be deformed inside the through hole of the first support plate 11 , and the second support plate 12 can also block the glue. If the flexible display panel 40 is arranged on the side close to the second support plate 12, first, the adhesive layer 13 will overflow from the hole during the bending process; When the bending radius decreases, the stress will increase accordingly, resulting in fracture failure.
  • the flexible display panel 40 can be an OLED display panel, which can be deformed under the action of external force.
  • the flexible display module 100 further includes a back plate 30, a polarizer 50 and a cover plate 70, the back plate 30 is arranged between the flexible display panel 40 and the support assembly 10, the polarizer 50 is disposed on the side of the flexible display panel 40 away from the support assembly 10 , and the cover plate 70 is disposed on the side of the polarizer 50 away from the flexible display panel 40 .
  • a foam layer 20 can be arranged between the back plate 30 and the support assembly 10 to buffer stress, and an ultra-thin glass (UTG) 60 can also be arranged between the polarizer 50 and the cover plate 70 , which improves creases. Since the various components of the flexible display module 100 need to be bonded, the above-mentioned components can be bonded through an adhesive layer such as OCA.
  • the flexible display module 100 in the above embodiment can be applied to a folding display device, which can be a small or medium-sized folding mobile phone, and is used to realize the display effect of the scroll screen being stored and unfolded around the scroll, It can maximize the flatness of the screen after unfolding and reduce the risk of internal film layer separation;
  • the folding display device can also be a large-size folding computer with a size of 14 inches or more, which is used to realize the large-size folding screen along the bending The axis is bent or unfolded. Since the bending radius of the large-sized folding screen is relatively large, the support assembly with the above structure can improve the crease phenomenon of the large-sized folding screen and reduce the risk of internal film layer separation.

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Abstract

一种柔性显示模组（100），包括柔性显示面板（40）和支撑组件（10），支撑组件（10）包括胶层（13）、位于胶层（13）两侧的第一支撑板（11）和第二支撑板（12），第一支撑板（11）包括位于柔性区FA的第一柔性部（1101），第一柔性部（1101）包括多个第一通孔（111），第二支撑板（12）包括位于柔性区的第二柔性部（1201），第二柔性部（1201）包括多个盲孔（121）。能够提高柔性显示模组（100）展开后的平整度。

Description

柔性显示模组 技术领域
本发明涉及显示技术领域，尤其涉及一种柔性显示模组。
背景技术
OLED(Organic Light-Emitting Diode，有机发光二极管)显示技术已在手机行业得到广泛的应用，中、小寸OLED面板在折叠手机的应用已进入商业化阶段。但折叠手机存在的折痕问题，一直未得到有效的解决。为此，业内研究人员一直在努力寻求新的解决方案，弥补折叠手机在短期内无法解决OLED屏幕折痕问题的技术短板。为达到能实现和折叠手机一样，将手机屏幕实现由小变大的收藏与展开的显示效果，同时最大限度地减少折痕问题，卷轴屏的OLED技术应运而生。
然而，关于卷轴OLED屏幕，依然存在很多制程、模组设计、光学方面的问题。其中，卷轴屏在使用过程中必然要承受卷轴收藏与展开动作的拉伸和卷曲应力，因而要求屏幕能很好地适配这一应力环境，避免模组内部的胶层和膜层出现脱粘现象，同时也要求屏幕在展开时具备良好的平整性。
OLED显示模组叠构中，为保证模组具备良好的整体平整性，叠构最底下一层材料一般采用较薄的不锈钢板(SUS)作为模组支撑层。为确保OLED屏幕具有良好的可弯折、可卷曲的性能，SUS厚度有严格的尺寸限制，现阶段柔性OLED屏幕模组所采用的SUS在30～150um厚度范围内，且和屏幕的弯折半径直接相关，通常半径越小，则所选用的SUS厚度越小，但在展开后，屏幕的平整度恢复性较差。为兼顾屏幕的可弯折性和平整性，通常采用的方式是将SUS的厚度设计在100～150um范围内，将卷曲区的SUS进行图案化设计，运用去除SUS厚度方向材料的连续性的方式，降低弯折方向的弹性模量，提高可弯折性能。但此种方式依然未能有效解决屏幕在卷曲展开后平整性恢复不良的问题。
技术问题
本发明实施例提供一种柔性显示模组，以解决现有的可卷曲显示模组从卷 曲状态到展开状态后的平整度恢复性较差的技术问题。
技术解决方案
本发明实施例提供一种柔性显示模组，包括柔性区，所述柔性显示模组包括柔性显示面板和用于支撑所述柔性显示面板的支撑组件，其中，所述支撑组件包括胶层，以及分别位于所述胶层两相对侧的第一支撑板和第二支撑板；其中，所述第一支撑板包括位于所述柔性区的第一柔性部，所述第一柔性部包括多个第一通孔，所述第二支撑板包括位于所述柔性区的第二柔性部，所述第二柔性部背离所述第一支撑板一侧包括多个盲孔。
在本发明的一些实施例中，多个所述第一通孔沿第一方向以及与第一方向相交的第二方向排列，多个所述盲孔沿所述第一方向排列，所述第一方向和所述第二方向所在的平面与所述支撑组件的表面平行，且所述第二方向平行于一卷轴或一弯折轴线。
在本发明的一些实施例中，所述第二方向为列方向，任一列所述盲孔沿所述第二方向的中心线与多列所述第一通孔中的一列沿所述第二方向的中心线在所述胶层的厚度方向上重合。
在本发明的一些实施例中，相邻两列所述盲孔沿所述第二方向的中心线之间的间距是相邻两列所述第一通孔沿所述第二方向的中心线之间的间距的两倍。
在本发明的一些实施例中，所述第一支撑板包括与所述第二方向垂直且相对的第一边缘和第二边缘，所述第一柔性部包括沿所述第一边缘排列以及沿所述第二边缘排列的多个第二通孔，任一所述第二通孔与其对应的边缘相交。
在本发明的一些实施例中，所述第二方向为列方向，任一所述第二通孔与至少一个所述第一通孔处于同列，沿所述第一边缘或所述第二边缘排列的多个所述第二通孔每间隔一列所述第一通孔设置。
在本发明的一些实施例中，任一所述盲孔沿所述第二方向的中心线与至少一个所述第二通孔沿所述第二方向的中心线在所述胶层的厚度方向上重合。
在本发明的一些实施例中，所述支撑组件的弯折内半径为R，所述第一支撑板的最大厚度为H 1，所述胶层的厚度为H 2，所述第二支撑板的最大厚度为 H 3，所述盲孔沿所述第一方向的宽度为B 1，沿所述第一方向排列的相邻两所述盲孔之间的间距为B 2，所述第二通孔沿所述第一方向的宽度为C 1，沿所述第一边缘或所述第二边缘排列的相邻两所述第二通孔之间的间距为C 2，其中，所述支撑组件满足以下关系：
Figure PCTCN2021105909-appb-000001
在本发明的一些实施例中，所述第二支撑板的最大厚度为H 3，所述盲孔的深度为H 4，H 4与H 3的比值的取值范围为0.4～0.5。
在本发明的一些实施例中，所述第二支撑板包括与所述第一边缘位于同侧的第三边缘、与所述第二边缘位于同侧的第四边缘，任一所述盲孔沿所述第二方向贯通所述第三边缘和第四边缘。
在本发明的一些实施例中，所述第二通孔的形状为U型。
在本发明的一些实施例中，所述第一方向与所述第二方向垂直，所述支撑组件包括与所述第一方向平行的一对称轴，所述支撑组件关于所述对称轴对称。
在本发明的一些实施例中，所述第一支撑板还包括沿所述第一方向和所述第二方向排列的多个第三通孔，所述第三通孔与所述第一通孔在所述第二方向上交替排列。
在本发明的一些实施例中，所述第二方向为列方向，任一列所述第三通孔沿所述第二方向的中心线与同列的所述第一通孔沿所述第二方向的中心线重合。
在本发明的一些实施例中，同一列中的相邻的所述第三通孔与所述第一通孔之间的间距是所述第一通孔在所述第一方向上的最大宽度的一半。
在本发明的一些实施例中，所述第二方向为列方向，相邻两列的所述第一通孔错位排列。
在本发明的一些实施例中，所述第二方向为列方向，相邻两列所述第一通孔之间的间距与所述第一通孔在所述第一方向上的最大宽度相等。
在本发明的一些实施例中，所述第一通孔在所述第二方向上的最大长度与所述第一通孔在所述第一方向上的最大宽度的比值为40～60。
在本发明的一些实施例中，所述柔性显示模组还包括：
背板，设置于所述柔性显示面板和所述支撑组件之间；
偏光片，设置于所述柔性显示面板背离所述支撑组件的一侧；以及
盖板，设置于所述偏光片背离所述柔性显示面板的一侧。
在本发明的一些实施例中，所述柔性显示面板设置于靠近所述支撑组件的第一支撑板的一侧。
有益效果
本发明提供的柔性显示模组具有弯折性能好、延展性能好、可靠性高的特点，能够提高柔性显示模组从卷曲或弯折状态到展平状态后的平整度，以及降低柔性显示模组的内部膜层分离的风险。
附图说明
图1为本发明实施例提供的柔性显示模组的膜层叠构示意图。
图2为本发明实施例提供的支撑组件的爆炸结构示意图。
图3为本发明实施例提供的第一支撑板的平面示意图。
图4为本发明实施例提供的第二支撑板的平面示意图。
图5为本发明实施例提供的支撑组件的膜层叠构示意图。
图6为本发明实施例提供的第一支撑板与第二支撑板的结构示意图。
图7为本发明另一实施例提供的第一支撑板的平面示意图。
图8为本发明实施例提供的第二支撑板的剖面示意图。
图9为本发明实施例提供的支撑组件弯折的结构示意图。
图10为本发明实施例提供的支撑组件的卷曲区弯折的局部示意图。
图11为本发明实施例提供的支撑组件的弯折应力云图。
图12为本发明实施例提供的盲孔的深度和盲孔的最大厚度的比值与弯折应力的关系图。
图13为本发明实施例提供的盲孔的深度和盲孔的最大厚度的比值与弯折反弹力的关系图。
本发明的实施方式
本申请提供一种柔性显示模组，为使本申请的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本申请进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
现有技术一般采用将支撑板的位于弯折区或卷曲区的部分进行图案化设计，以此降低弯折、卷曲方向的弹性模量，提高可弯折性能，但此种方式扔未能有效解决屏幕在卷曲展开后平整性恢复不良的问题，本发明实施例提供一种柔性显示模组，以解决上述缺陷。
请参阅图1和图2，本发明实施例提供一种柔性显示模组100，包括柔性区FA，所述柔性显示模组100包括柔性显示面板40和用于支撑所述柔性显示面板40的支撑组件10。
其中，所述柔性区FA可以在外力的作用下变形，变形可以是弯曲、折叠、卷绕、扭曲中的至少一者，本发明的实施例对所述柔性区FA的数量及变形方式不进行限制，所述柔性显示模组100具体可为卷曲显示模组，可绕一卷轴进行卷曲收纳或展开，所述柔性显示模组100还可为折叠显示模组，可沿至少一弯折轴线进行弯折，所述柔性显示模组100还可以同时具有弯折性能和卷绕性能。
此外，所述柔性显示模组100还包括位于所述柔性区NA一侧的非柔性区NFA，所述非柔性区NFA不在外力的作用下发生变形。
请参阅图1至图4，所述支撑组件10包括胶层13以及位于所述胶层13相对两侧的第一支撑板11和第二支撑板12，其中，所述第一支撑板11包括第一柔性部1101，所述第一柔性部1101包括多个第一通孔111，所述第二支撑板12包括第二柔性部1201，所述第二柔性部1201背离所述第一支撑板11一侧包括多个盲孔121，所述第一柔性部1101和所述第二柔性部1201均位于所述柔性区FA，即多个所述第一通孔111和多个所述盲孔121均位于所述柔性区FA。通过胶层13将第一支撑板11和第二支撑板12粘合，利用胶层13所具备的粘性阻尼效应以及低模量特性，起到缓冲释放上下两层支撑板的弯折和卷曲应力的作用。
本发明实施例提供的支撑组件10能够满足柔性显示模组100发生弯折、卷曲的性能，通过仿真分别优化第一支撑板11和第二支撑板12的厚度，既具 有对柔性显示面板足够的支撑力，也可提高柔性显示模组在弯折、卷曲后恢复展平状态时的平整度。
现有技术一般通过单纯提高支撑板的厚度来改善可卷曲显示模组在展开状态下的平整度，但此种方案会导致支撑板自身的应力过大，导致可卷曲显示模组整体不易弯折，还会引起断裂行为以及膜层分离的风险。而本实施例提供的柔性显示模组100的支撑组件10为复合结构，其第一支撑板11以及第二支撑板12具有不同的图案化设计，既能提高对柔性显示模组在展开状态下的整体支撑刚度来改善平整度，也能降低柔性显示模组的柔性区FA的弹性模量，提高弯折和卷曲性能。
请参阅图3和图4，多个所述第一通孔111沿第一方向X以及与第一方向X相交的第二方向Y排列，多个所述盲孔121沿所述第一方向X排列，所述第一方向X和所述第二方向Y所在的平面与所述支撑组件10的表面平行，且所述第二方向Y平行于一卷轴或一弯折轴线。当所述柔性显示模组100具有卷曲功能时，所述柔性显示模组100沿所述卷轴进行卷曲或展开，当所述柔性显示模组100具有弯折功能时，所述柔性显示模组沿所述弯折轴线进行弯折或展开。所述胶层13优选为柔性胶层13，包括但不限于OCA胶。
所述第一支撑板11和所述第二支撑板12可为但不限于不锈钢(SUS)材质。
在本发明实施例中的通孔指的是贯穿其所在膜层厚度的孔，盲孔指的是未完全贯穿其所在膜层厚度的孔。
请参阅图1、图3～图5，本发明实施例以所述柔性显示模组100包括具有卷绕性能的柔性区FA和位于所述柔性区FA一侧的非柔性区NFA为例进行说明，所述柔性显示模组100的位于所述柔性区FA的部分可绕一卷轴发生卷曲或展平，以改变柔性显示模组100的显示面的大小。
所述支撑组件10包括卷曲区101和位于所述卷曲区101一侧的非卷曲区102，所述卷曲区101与所述柔性区FA对应，所述非卷曲区102与所述非柔性区NFA对应，所述卷曲区101用于围绕一卷轴卷曲或展平。以下对支撑组件10的结构描述同样适用于沿一弯折轴进行弯折或展开的柔性显示模组。
所述第一支撑板11包括第一柔性部1101和第一平直部1102，所述第二 支撑板12包括第二柔性部1201和第二平直部1202，所述第一柔性部1101和所述第二柔性部1201对应位于所述卷曲区101，所述第一平直部1102和所述第二平直部1202对应位于所述非卷曲区102。其中，所述第一通孔111位于所述第一支撑板11对应所述卷曲区101的第一柔性部1101，所述盲孔121位于所述第二支撑板12对应所述卷曲区101的第二柔性部1201，以使得所述支撑组件10可用于支撑可卷曲的柔性显示面板，在保证卷曲区101可弯折、卷曲性能的同时，也能提高对柔性显示面板的支撑强度。
具体地，请参阅图3和图4，多个所述第一通孔111沿第一方向X以及与第一方向X相交的第二方向Y排列，多个所述盲孔121沿所述第一方向X排列，所述第一方向X和所述第二方向Y所在的平面与所述支撑组件10的表面平行，且所述第二方向Y平行于所述卷轴。
为了使得本发明实施例的支撑组件10在弯折、卷曲过程中应力分散均匀，优选地，多个所述盲孔121沿所述第一方向X等间距排列，多个所述第一通孔111沿所述第一方向X等间距排列，沿所述第二方向Y等间距排列。
请参阅图6，为了保证所述支撑组件10的整体受力达到最优，任一列所述盲孔121沿所述第二方向Y的中心线L2与多列所述第一通孔111中的一列沿所述第二方向Y的中心线L1在所述胶层13的厚度方向上重合。通过将第一支撑板11上的第一通孔111的中心线L1与所述第二支撑板12上的盲孔121的中心线L2对齐设置，以此来减小上下两层支撑板在弯折过程中因弯折带来的各个子结构运动不匹配带来的应力集中的风险。其中，在本发明实施例中，以所述第二方向Y为列方向。
更进一步地，请参阅图6，可将相邻两列所述盲孔121沿所述第二方向Y的中心线L2之间的间距是相邻两列所述第一通孔111沿所述第二方向Y的中心线L1之间的间距的两倍。简而言之，在上述中心线L1与中心线L2重合的基础上，所述盲孔121每间隔一列第一通孔111设置，通过合理设计相邻盲孔121之间的间距，可在保证所述支撑组件10刚度的同时，也能保证其弯折、卷曲性能。
在本发明的一些实施例中，请参阅图3，所述第一支撑板11包括与所述第二方向Y垂直且相对的第一边缘E1和第二边缘E2，所述第一柔性部1101 包括沿所述第一边缘E1排列以及沿所述第二边缘E2排列的多个第二通孔112，任一所述第二通孔112与其对应的边缘相交。通过在所述第一支撑板11的两边缘分别对应设置一排所述第二通孔112，可提高所述第一支撑板11的在弯折时的延展性能，有助于弯折应力的释放。
在本发明的实施例中，所述第二通孔112的形状为U型。
优选地，沿所述第一边缘E1排列以及沿所述第二边缘E2排列的多个所述通孔等间距分布。
更进一步地，请参阅图3，任一所述第二通孔112与至少一个所述第一通孔111处于同列，所述第二通孔112沿所述第二方向Y的中心线与所述第一通孔111的中心线L1重合，所述第二通孔112沿所述第一方向X的宽度与所述第一通孔111的宽度相等。
优选地，请参阅图3，沿所述第一边缘E1或所述第二边缘E2排列的多个所述第二通孔112每间隔一列所述第一通孔111设置。通过将沿边缘排列的第二通孔112每间隔一列第一通孔111设置，而不是在每一列第一通孔111靠近边缘的位置设计一第二通孔112，可以增强第一支撑板11边缘的刚度，有利于边缘的平整性设计。
在一些实施例中，请参阅图6，任一所述盲孔121沿所述第二方向Y的中心线L2与至少一个所述第二通孔112沿所述第二方向Y的中心线在所述支撑组件10的厚度方向上重合。通过将多列盲孔121的中心线L2与多列第二通孔112的中心线一一对应，使得上下两层的支撑板在弯折、卷曲过程中始终保持良好的适配性，避免上下两层受力不均衡带来的应力集中现象。
在本发明的一些实施例中，请参阅图7，所述第一支撑板11还包括沿所述第一方向X和所述第二方向Y排列的多个第三通孔113，所述第三通孔113与所述第一通孔111在所述第二方向Y上交替排列。通过进一步地在沿所述第二方向Y排列的相邻的第一通孔111之间增设第三通孔113，可降低相邻第一通孔111的头部之间的应力集中现象。
较佳地，任一列所述第三通孔113沿所述第二方向Y的中心线与同列的所述第一通孔111沿所述第二方向Y的中心线L1重合。
在本发明的实施例中，同一列中的相邻的所述第三通孔113与所述第一通 孔111之间的间距是所述第一通孔111在所述第一方向X上的最大宽度的一半。为了避免通孔的端部(头部)的应力较为集中，可将通孔的端部设计为弧状，因此通孔在不同位置所处的宽度以及长度会不同，在第一方向X上，通孔的中部的宽度会大于端部的宽度，通孔沿第二方向Y上的中心线所处位置的长度会大于中心线两侧位置的长度，本发明实施例提及的通孔在第一方向X上的最大宽度指的是通孔中部的宽度，下文提及的通孔沿第二方向Y上的最大长度指的是通孔沿第二方向Y的中心线所处位置的长度。
请参阅图4，在本发明的实施例中，所述第二支撑板12包括与所述第一边缘E1位于同侧的第三边缘E3、与所述第二边缘E2位于同侧的第四边缘E4，任一所述盲孔121沿所述第二方向Y贯通所述第三边缘E3和第四边缘E4。
优选地，所述第一方向X与所述第二方向Y垂直，如图2所示，所述支撑组件10包括与所述第一方向X平行的一对称轴L3，所述支撑组件10关于所述对称轴对称，如此可使得所述支撑组件10的卷曲区101在弯折、卷曲时保持应力分散均匀。
请参阅图7至图10，为了使得上下两层支撑板能够在展平和弯折状态始终能够保证盲孔121的中心线L2与通孔的中心线L1一一对应，从而避免在弯折过程中受力不平衡，所述支撑组件10的设计应满足以下关系：
Figure PCTCN2021105909-appb-000002
其中，所述支撑组件10的弯折内半径为R，所述第一支撑板11的最大厚度为H 1，所述胶层13的厚度为H 2，所述第二支撑板12的最大厚度为H 3，所述第二支撑板12的最大厚度指的是避开盲孔外的板本体的厚度，所述盲孔121沿所述第一方向X的宽度为B 1，沿所述第一方向X上相邻的两所述盲孔121之间的间距为B 2，所述第二通孔112沿所述第一方向X的宽度为C 1，沿所述第一方向X上相邻的两所述第二通孔112之间的间距为C 2。
请参阅图9，所述支撑板组件发生弯折、卷曲时，所述第二支撑板12相对于所述第一支撑板11距离所述支撑板组件发生弯折时的圆心更近，即所述支撑组件10的弯折内半径R指的是弯折时该圆心与所述第二支撑板12的距 离。
在实际设计过程中，R、H 1、H 2、H 3的数值可根据实际设计值确定，C 1、C 2可根据第一支撑板11上的第一通孔111的孔宽、孔间距确定，在此条件下，B 1、B2可根据上述公式及第二支撑板12的第二柔性部1201的尺寸获得。
请参阅图11，图5为本发明实施例的支撑组件10的弯折仿真云图，通过确定支撑组件10的弯折半径R及H 1、H 2、H 3、C 1、C 2、B 1、B2的取值后，通过调整盲孔121的孔深厚度H 4与第二支撑板最大厚度H 3的比值，可使得所述支撑组件10的弯折应力降低至610MPa左右，远低于选材的失效强度1600MPa。
如图12和图13所示，图12为第二支撑板12的盲孔121的深度H 4和最大厚度H 3的比值与弯折应力的关系图，图13为第二支撑板12的盲孔121的深度H 4和最大厚度H 3的比值与弯折反弹支撑力的关系图，具体地，在确定第一支撑板11的结构尺寸的前提下，通过调整该比值可获取较优弯折反弹支撑性与弯折性能；结合上述公式，可逐步获取上下两层支撑板的各个结构特征值的取值范围，以此获得最优的弯折性能。
从图12和图13可知，本发明实施例的H 4与H 3的比值的较优的取值范围为0.4～0.5，在此取值范围内，弯折应力达到最优取值范围。
请参阅图7，本发明实施例中的相邻两列的第一通孔111错位排列，相比于对齐排列的设计，错位排列的第一通孔111能够避免应力局部集中，有利于卷曲区101的弯折、卷曲。
进一步地，所述第一通孔111、所述第二通孔112以及所述第三通孔113均沿所述第二方向Y延伸，即本实施例提及的通孔，其在第二方向Y上的最大长度均大于其在所述第一方向X上的最大宽度。将各个通孔的延伸方向设置为与卷轴方向平行，有利于提升所述第一支撑板11的延展性能。更具体地，所述第一通孔111在所述第二方向Y上的最大长度与所述第一通孔111在所述第一方向X上的最大宽度的比值为40～60。
相邻两列所述第一通孔111之间的间距与所述第一通孔111在所述第一方向X上的最大宽度相等。
所述第一通孔111沿所述第二方向Y上的最大长度、所述第二通孔112 沿所述第二方向Y上的最大长度、所述第三通孔113沿所述第二方向Y上的最大长度依次减小。
同列中相邻的第一通孔111与所述第三通孔113之间的间距视实际设计中第一通孔111的孔长、孔宽、及同列中相邻两第一通孔111之间的间距的设计值而定，在本发明的实施例中，同列中相邻的第一通孔111与所述第三通孔113之间的间距等于所述第一通孔111的沿所述第一方向X上的最大宽度的一半。
在本发明的实施例中，所述第一通孔111、所述第二通孔112以及所述第三通孔113在所述第一方向X上的宽度相同。
在本发明的实施例中，所述第一通孔111、所述第二通孔112可为但不限于长条形。为了避免长条形的拐角处的应力集中，所述第一通孔111以及所述第二通孔112的端部可设计为弧形，包括但不限于半椭圆形、半圆形等。
具体地，本发明的一种实施例中，第一通孔111沿所述第二方向Y的最大长度为4.5～6mm，沿所述第一方向X的最大宽度为0.2～0.25mm，相邻两列的所述第一通孔111之间的间距为0.18～0.22mm。所述第一支撑板11的各个通孔的几何特征值可根据屏幕模组的具体尺寸大小、叠构厚度、模组组成作相应的调配。
在上述设计方案中，在确定了显示模组的弯折半径值R条件下，结合第制程板的各个子结构特征值、板厚度、胶层13厚度值，以及B 1、B 2、C 1、C 2之间满足的尺寸关系，来确保上下两层支撑板能够在展平与弯折状态均能保证各子结构的中心一一对位关系后，再调整H 4与H 3的比值，从而获取支撑组件10的最优弯折性能，降低模组的失效风险。
请参阅图1，所述柔性显示面板40设置于靠近所述支撑组件10的第一支撑板11的一侧，由于所述支撑组件10在与模组贴合时需要采用胶体贴合，在弯折过程中胶体可被限定在第一支撑板11的通孔内部变形，第二支撑板12也可挡住胶体。如果将柔性显示面板40设置于靠近第二支撑板12的一侧，一是在弯折过程中胶层13会从孔洞中溢出，二是因弯折时位置发生变化，第二支撑板12所处的弯折半径减小，应力会相应增大，从而发生断裂失效。
在本发明的实施例中，所述柔性显示面板40可为OLED显示面板，可在 外力作用下发生变形。
具体地，所述柔性显示模组100还包括背板30、偏光片50以及盖板70，所述背板30设置于所述柔性显示面板40和所述支撑组件10之间，所述偏光片50设置于所述柔性显示面板40背离所述支撑组件10的一侧，所述盖板70设置于所述偏光片50背离所述柔性显示面板40的一侧。
所述背板30与所述支撑组件10之间可设置泡棉层20，起到缓冲应力的作用，所述偏光片50与所述盖板70之间还可设置超薄玻璃(UTG)60，可改善折痕。由于所述柔性显示模组100的各个组件之间需要贴合，因此上述各个组件之间可通过OCA等胶层贴合。
上述实施例中的柔性显示模组100可应用于折叠显示装置中，所述折叠显示装置可为中、小尺寸的折叠手机，用于实现卷轴屏的绕卷轴收藏和展开的显示效果的同时，可最大限度地提升屏幕展开后的平整性，以及降低内部膜层分离的风险；所述折叠显示装置还可为14寸以上的大尺寸的折叠电脑，用于实现大尺寸的折叠屏沿弯折轴进行弯折或展开，由于大尺寸的折叠屏的弯折半径较大，因此具有上述结构的支撑组件可改善大尺寸折叠屏的折痕现象，以及降低内部膜层分离的风险。
可以理解的是，对本领域普通技术人员来说，可以根据本申请的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本申请所附的权利要求的保护范围。

Claims (20)

  1. 一种柔性显示模组，包括柔性区，所述柔性显示模组包括柔性显示面板和用于支撑所述柔性显示面板的支撑组件，其中，所述支撑组件包括：
    胶层，以及
    分别位于所述胶层两相对侧的第一支撑板和第二支撑板；其中，
    所述第一支撑板包括位于所述柔性区的第一柔性部，所述第一柔性部包括多个第一通孔，所述第二支撑板包括位于所述柔性区的第二柔性部，所述第二柔性部背离所述第一支撑板一侧包括多个盲孔。
  2. 根据权利要求1所述的柔性显示模组，其中，多个所述第一通孔沿第一方向以及与第一方向相交的第二方向排列，多个所述盲孔沿所述第一方向排列，所述第一方向和所述第二方向所在的平面与所述支撑组件的表面平行，且所述第二方向平行于一卷轴或一弯折轴线。
  3. 根据权利要求2所述的柔性显示模组，其中，所述第二方向为列方向，任一列所述盲孔沿所述第二方向的中心线与多列所述第一通孔中的一列沿所述第二方向的中心线在所述胶层的厚度方向上重合。
  4. 根据权利要求3所述的柔性显示模组，其中，相邻两列所述盲孔沿所述第二方向的中心线之间的间距是相邻两列所述第一通孔沿所述第二方向的中心线之间的间距的两倍。
  5. 根据权利要求2所述的柔性显示模组，其中，所述第一支撑板包括与所述第二方向垂直且相对的第一边缘和第二边缘，所述第一柔性部包括沿所述第一边缘排列以及沿所述第二边缘排列的多个第二通孔，任一所述第二通孔与其对应的边缘相交。
  6. 根据权利要求5所述的柔性显示模组，其中，所述第二方向为列方向，任一所述第二通孔与至少一个所述第一通孔处于同列，沿所述第一边缘或所述第二边缘排列的多个所述第二通孔每间隔一列所述第一通孔设置。
  7. 根据权利要求6所述的柔性显示模组，其中，任一所述盲孔沿所述第二方向的中心线与至少一个所述第二通孔沿所述第二方向的中心线在所述胶层的厚度方向上重合。
  8. 根据权利要求7所述的柔性显示模组，其中，所述支撑组件的弯折内 半径为R，所述第一支撑板的最大厚度为H 1，所述胶层的厚度为H 2，所述第二支撑板的最大厚度为H 3，所述盲孔沿所述第一方向的宽度为B 1，沿所述第一方向排列的相邻两所述盲孔之间的间距为B 2，所述第二通孔沿所述第一方向的宽度为C 1，沿所述第一边缘或所述第二边缘排列的相邻两所述第二通孔之间的间距为C 2，其中，所述支撑组件满足以下关系：
    Figure PCTCN2021105909-appb-100001
  9. 根据权利要求7所述的柔性显示模组，其中，所述第二支撑板的最大厚度为H 3，所述盲孔的深度为H 4，H 4与H 3的比值的取值范围为0.4～0.5。
  10. 根据权利要求5所述的柔性显示模组，其中，所述第二支撑板包括与所述第一边缘位于同侧的第三边缘、与所述第二边缘位于同侧的第四边缘，任一所述盲孔沿所述第二方向贯通所述第三边缘和第四边缘。
  11. 根据权利要求5所述的柔性显示模组，其中，所述第二通孔的形状为U型。
  12. 根据权利要求2所述的柔性显示模组，其中，所述第一方向与所述第二方向垂直，所述支撑组件包括与所述第一方向平行的一对称轴，所述支撑组件关于所述对称轴对称。
  13. 根据权利要求2所述的柔性显示模组，其中，所述第一支撑板还包括沿所述第一方向和所述第二方向排列的多个第三通孔，所述第三通孔与所述第一通孔在所述第二方向上交替排列。
  14. 根据权利要求13所述的柔性显示模组，其中，所述第二方向为列方向，任一列所述第三通孔沿所述第二方向的中心线与同列的所述第一通孔沿所述第二方向的中心线重合。
  15. 根据权利要求14所述的柔性显示模组，其中，同一列中的相邻的所述第三通孔与所述第一通孔之间的间距是所述第一通孔在所述第一方向上的最大宽度的一半。
  16. 根据权利要求2所述的柔性显示模组，其中，所述第二方向为列方向，相邻两列的所述第一通孔错位排列。
  17. 根据权利要求2所述的柔性显示模组，其中，所述第二方向为列方向， 相邻两列所述第一通孔之间的间距与所述第一通孔在所述第一方向上的最大宽度相等。
  18. 根据权利要求2所述的柔性显示模组，其中，所述第一通孔在所述第二方向上的最大长度与所述第一通孔在所述第一方向上的最大宽度的比值为40～60。
  19. 根据权利要求1所述的柔性显示模组，其中，所述柔性显示模组还包括：
    背板，设置于所述柔性显示面板和所述支撑组件之间；
    偏光片，设置于所述柔性显示面板背离所述支撑组件的一侧；以及
    盖板，设置于所述偏光片背离所述柔性显示面板的一侧。
  20. 根据权利要求1所述的柔性显示模组，其中，所述柔性显示面板设置于靠近所述支撑组件的第一支撑板的一侧。
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