WO2022036819A1 - 支撑片及显示模组 - Google Patents

支撑片及显示模组 Download PDF

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Publication number
WO2022036819A1
WO2022036819A1 PCT/CN2020/120088 CN2020120088W WO2022036819A1 WO 2022036819 A1 WO2022036819 A1 WO 2022036819A1 CN 2020120088 W CN2020120088 W CN 2020120088W WO 2022036819 A1 WO2022036819 A1 WO 2022036819A1
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WO
WIPO (PCT)
Prior art keywords
bending
support body
reversing
bending part
reversing portion
Prior art date
Application number
PCT/CN2020/120088
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 US17/262,756 priority Critical patent/US11955036B2/en
Publication of WO2022036819A1 publication Critical patent/WO2022036819A1/zh
Priority to US18/588,507 priority patent/US20240194097A1/en

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Classifications

    • 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
    • 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
    • G09F9/335—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 being organic light emitting diodes [OLED]

Definitions

  • the invention relates to the field of display technology, in particular to a support sheet and a display module.
  • a typical OLED flexible screen module is mainly composed of a protective layer, an adhesive layer, an OLED film layer, a touch layer, a polarizer, and a support sheet.
  • the bottom layer of the module is a special stainless steel material, referred to as SUS, which plays the role of support and protection. Because its elastic modulus is much larger than that of the adjacent adhesive layer, it is not easy to deform, and the adjacent adhesive layer is generally optical adhesive, which is a typical viscoelastic material, and is prone to viscoplastic strain during the bending process. Therefore, the difference in mechanical properties and stress state between the two makes it impossible to ensure consistent follow-up and good deformation coordination during the bending process, so the SUS and the optical glue are dislocated during the bending process. Compared with other positions, it is more prominent. After multiple bending, it is easy to cause stress concentration, which in turn leads to debonding and separation failure.
  • SUS stainless steel material
  • Embodiments of the present invention provide a support sheet and a display module, so as to solve the technical problem that the support sheet and the optical adhesive of the existing display module are prone to errors during the bending process, thereby causing debonding and separation failure.
  • An embodiment of the present invention provides a support sheet, which includes a first support body, a second support body, and a bent portion, and the bent portion is connected between the first support body and the second support body;
  • the bending part includes at least one bending unit, the bending unit includes a first bending part, one end of the first bending part is connected to the first support body, and the first bending part is the other end is connected to the second support body;
  • the first bending portion In the direction from the first support body to the second support body, the first bending portion is in a reciprocating bending structure.
  • the first bending portion includes:
  • first subsections a plurality of first subsections, the plurality of first subsections are spaced apart and arranged side by side;
  • the first reversing portion is connected to the same side of the k-th first sub-segment and the (k+1)-th first sub-segment;
  • At least one second reversing portion the bending direction of the second reversing portion is opposite to the bending direction of the first reversing portion, and the second reversing portion is connected to the (k+1)th A sub-segment and the other same side of the first sub-segment described in clause (k+2); k is odd or even.
  • the first reversing portion is in the shape of an arc or a folded line formed by two line segments.
  • the bending unit further includes a second bending portion, one end of the second bending portion is connected to the first support body, and the second bending portion The other end is connected to the second support body;
  • the second bending portion In the direction from the first support body to the second support body, the second bending portion is in a reciprocating bending structure
  • the second bending part and the first bending part have a plurality of first connection points, and the plurality of first connection points are arranged at intervals; the extension track of the first bending part and the second bending part are The extended trajectories of the folded portions are separated from each other and rejoined at each said first connection.
  • the second bending portion includes:
  • the plurality of second subsections are spaced apart and arranged side by side;
  • At least one third reversing part the bending direction of the third reversing part is opposite to the bending direction of the first reversing part, and the third reversing part is connected to the k-th second sub-section and the the same side of the second subparagraph referred to in clause (k+1);
  • At least one fourth reversing portion the bending direction of the fourth reversing portion is opposite to the bending direction of the third reversing portion, and the fourth reversing portion is connected to the (k+1)th The second sub-segment and the other same side of the second sub-segment mentioned in clause (k+2);
  • the third reversing portion and the first reversing portion are connected to form the first connection.
  • the first reversing portion and the third reversing portion are connected by a rounded transition.
  • the distance between two adjacent first subsections and the distance between two adjacent second subsections are equal.
  • the first reversing portion and the third reversing portion are both semi-circular arc shapes, the width of the first connection is X, and the first subsection and The width of the second sub-section is Y, the width of the hole structure formed by the first bending part and the second bending part is D, and the first bending part and the second bending part
  • the length of the formed pore structure is L;
  • a plurality of the bending units are arranged side by side and connected in sequence;
  • the fourth reversing portion and the second reversing portion are connected to form a second connection.
  • the present invention also relates to a display module, which includes an OLED panel, an adhesive layer and a support plate as described in the above embodiments, which are arranged in sequence;
  • the OLED panel includes a bending area and a non-bending area located on both sides of the bending area.
  • the bending portion is correspondingly disposed in the bending area.
  • the support sheet includes a first support body, a second support body, and a bent portion, and the bent portion is connected between the first support body and the second support body;
  • the bending part includes at least one bending unit, the bending unit includes a first bending part, one end of the first bending part is connected to the first support body, and the first bending part is the other end is connected to the second support body;
  • the first bending portion In the direction from the first support body to the second support body, the first bending portion is in a reciprocating bending structure.
  • the first bending portion includes:
  • first subsections a plurality of first subsections, the plurality of first subsections are spaced apart and arranged side by side;
  • the first reversing portion is connected to the same side of the k-th first sub-segment and the (k+1)-th first sub-segment;
  • At least one second reversing portion the bending direction of the second reversing portion is opposite to the bending direction of the first reversing portion, and the second reversing portion is connected to the (k+1)th A sub-segment and the other same side of the first sub-segment described in clause (k+2); k is odd or even.
  • the first reversing portion is in the shape of an arc or a folded line formed by two line segments.
  • the bending unit further includes a second bending part, one end of the second bending part is connected to the first support body, and the second bending part is the other end of the part is connected to the second support body;
  • the second bending portion In the direction from the first support body to the second support body, the second bending portion is in a reciprocating bending structure
  • the second bending part and the first bending part have a plurality of first connection points, and the plurality of first connection points are arranged at intervals; the extension track of the first bending part and the second bending part are The extended trajectories of the folded portions are separated from each other and rejoined at each said first connection.
  • the second bending portion includes:
  • the plurality of second subsections are spaced apart and arranged side by side;
  • At least one third reversing part the bending direction of the third reversing part is opposite to the bending direction of the first reversing part, and the third reversing part is connected to the k-th second sub-section and the the same side of the second subparagraph referred to in clause (k+1);
  • At least one fourth reversing portion the bending direction of the fourth reversing portion is opposite to the bending direction of the third reversing portion, and the fourth reversing portion is connected to the (k+1)th The second sub-segment and the other same side of the second sub-segment mentioned in clause (k+2);
  • the third reversing portion and the first reversing portion are connected to form the first connection.
  • the first reversing portion and the third reversing portion are connected by rounded transitions.
  • the distance between two adjacent first sub-segments and the distance between two adjacent second sub-segments are equal.
  • the first reversing portion and the third reversing portion are both semi-circular arc shapes, the width of the first connection is X, and the first subsection and the width of the second subsection is Y, the width of the hole structure formed by the first bending part and the second bending part is D, the first bending part and the second bending part
  • the length of the partially formed pore structure is L;
  • a plurality of the bending units are arranged side by side and connected in sequence;
  • the fourth reversing portion and the second reversing portion are connected to form a second connection.
  • the first bending part of the bending part of the supporting sheet is set to be a reciprocating bending structure, and the accumulated deformation of the first bending part is used to supplement the adjacent adhesive layer during the bending process.
  • the deformation difference can reduce the local stress concentration phenomenon, and effectively reduce the aging risk in the bending process of the display module.
  • FIG. 1 is a schematic structural diagram of a support sheet according to an embodiment of the present invention.
  • FIG. 2 is a partial structural schematic diagram of a bent portion of a support sheet according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a bending unit of a support sheet according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of the first bending portion of the support sheet before bending according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of the first bending portion of the support sheet after bending according to an embodiment of the present invention.
  • FIG. 6 is a trend diagram of the length L of the hole structure in the bending unit of the support sheet and the stress value of the bending unit according to the embodiment of the present invention
  • FIG. 8 is a trend diagram of the spacing (connection) X of the hole structure in the long axis direction of the bending unit of the support sheet according to the embodiment of the present invention and the stress value of the bending unit;
  • FIG. 9 is a trend diagram of the spacing (the width of the first subsection) Y of the hole structure in the short axis direction in the bending unit of the support sheet according to the embodiment of the present invention and the stress value of the bending unit;
  • FIG. 10 is a schematic top-view structural diagram of a display module in a flat state according to an embodiment of the present invention.
  • FIG. 11 is a schematic cross-sectional structural diagram of a display module in a bent state according to an embodiment of the present invention.
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as “first”, “second” may expressly or implicitly include one or more of said features. In the description of the present invention, “plurality” means two or more, unless otherwise expressly and specifically defined.
  • connection should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection or can communicate with each other; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal connection between two elements or an interaction relationship between the two elements.
  • connection should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection or can communicate with each other; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal connection between two elements or an interaction relationship between the two elements.
  • specific meanings of the above terms in the present invention can be understood according to specific situations.
  • a first feature "on” or “under” a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them.
  • the first feature being “above”, “over” and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature is “below”, “below” and “below” the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.
  • FIG. 1 is a schematic structural diagram of a support sheet according to an embodiment of the present invention
  • FIG. 2 is a structural schematic diagram of a bent portion of the support sheet according to an embodiment of the present invention
  • FIG. 3 is a support sheet according to an embodiment of the present invention. Schematic diagram of the structure of the bending unit
  • FIG. 4 is a schematic diagram of the structure of the first bending part of the support sheet in the embodiment of the present invention before bending.
  • An embodiment of the present invention provides a support sheet 100 , which includes a first support body 11 , a second support body 12 and a bending portion 13 .
  • the bent portion 13 is connected between the first support body 11 and the second support body 12 .
  • the bending portion 13 includes at least one bending unit 13a.
  • the bending unit 13a includes a first bending portion 131 .
  • One end of the first bent portion 131 is connected to the first support body 11
  • the other end of the first bent portion 131 is connected to the second support body 12 .
  • the first bending portion 131 is a reciprocating bending structure.
  • the accumulated deformation of the first bending portion 131 is used to supplement the deformation of the adjacent adhesive layer during the bending process.
  • the difference can reduce the local stress concentration phenomenon, and effectively reduce the aging risk in the bending process of the display module.
  • one first bent portion 131 has n s-shaped substructures.
  • the cumulative deformation amount is n*L0, where n is a positive integer. That is, the stretchability of the bending portion is improved by accumulating deformation, thereby improving the bendability of the support sheet 100 .
  • the bending unit 13 a further includes a second bending portion 132 .
  • One end of the second bending portion 132 is connected to the first support body 11
  • the other end of the second bending portion 132 is connected to the second support body 12 .
  • the second bending portion 132 is in a reciprocating bending structure.
  • the second bent portion 132 and the first bent portion 131 have a plurality of first connection points 133 .
  • a plurality of the first connection points 133 are arranged at intervals.
  • a plurality of first connection points 133 are arranged side by side.
  • the extension track of the first bent portion 131 and the extension track of the second bent portion 132 are separated from each other and rejoined at each of the first connections 133 .
  • the first bending portion 131 and the second bending portion 132 are separated from each other at the first connection 133 and merged together at the next first connection 133 , thus forming a patterned double
  • the s-shaped structure improves the ductility and stability of the bending portion 13 while improving the bendability of the bending portion 13 .
  • a plurality of the bending units 13 a are arranged side by side and connected in sequence.
  • Two adjacent bending units 13a are connected to form a plurality of second connection points 134 .
  • the extension track of the second bending portion 132 of one bending unit 13a and the extending track of the first bending portion 131 of the other bending unit 13a are separated from each other and Re-merge 134 at each second connection.
  • two adjacent bending units 13 a are also connected and arranged, so that the entire bending portion 13 is in a state of being connected and integrated, which improves the overall stability of the bending portion 13 .
  • the integrated state means that the bending portion 13 may be an integrally formed structure, or may be an integral structure formed by mechanical connection.
  • the first bent portions 131 and the second bent portions 132 are alternately arranged with each other and connected in sequence, so that the bent portion 13 is formed as a whole, and since the first bent portion 131 and the second bent portion 132
  • the back-and-forth bending structure of the two bending parts 132 promotes the formation of a patterned structure in the bending part 13 , that is, a plurality of hole structures 135 are defined between the first bending part 131 and the second bending part 132 for further release The bending stress applied to the bending portion 13 .
  • the local stress concentration phenomenon can be reduced by accumulating the amount of deformation, which effectively reduces the existence of the display module during the bending process.
  • the first bending part 131 and the second bending part 132 directly define the formed hole structure 135 to achieve the effect of releasing the bending stress on the bending part 13; and the first bending part 131 and the second bending part 131
  • the connection of the bent portions 132 to each other improves the overall stability of the bent portions 13 .
  • the first bending portion 131 includes a plurality of first subsections 1311 , at least one first reversing portion 1312 and at least one second reversing portion 1313 .
  • a plurality of the first subsections 1311 are spaced apart and arranged side by side.
  • the first reversing portion 1312 is connected to the same side of the k-th first sub-segment and the (k+1)-th first sub-segment.
  • the bending direction of the second reversing portion 1313 is opposite to the bending direction of the first reversing portion 1312 .
  • the second reversing portion 1313 is connected to the (k+1)th first sub-section 1311 and the (k+2)-th first subsection 1311 on the other same side. k is odd or even.
  • k is an odd or even number, that is, k includes at least 2 of the odd numbers starting from 1, such as (1, 3), (1, 3, 5), etc.; or includes starting from 0 or 2 At least 2 of the starting even numbers, such as (0, 2), (2, 4), etc.
  • the plurality of first reversing portions 1312 are connected to the first first subsection 1311 and the second first subsection 1311 in a one-to-one correspondence, and are connected to the third first subsection 1311 and the first subsection 1311 of Article 4 are connected to the first subsection 1311 of Article 5 and the first subsection 1311 of Article 6, and are connected to the first subsection 1311 of Article 7 and the first subsection 1311 of Article 8.
  • the plurality of second commutation parts 1313 are connected to the second first sub-segment 1311 and the third first sub-segment 1311 in one-to-one correspondence, and are connected to the fourth first sub-segment 1311 and the fifth first sub-segment 1311 1311, connected to the first subsection 1311 of Article 6 and the first subsection 1311 of Article 7.
  • the first reversing portion 1312 is in an arc shape or a folded line shape formed by two line segments, but is not limited thereto.
  • the first subsection 1311 and the second subsection 1321 may be horizontal sections, inclined sections, or curved sections.
  • the second bending portion 132 includes a plurality of second sub-sections 1321 , at least one third turning portion 1322 and at least one fourth turning portion 1323 .
  • a plurality of the second subsections 1321 are spaced apart and arranged side by side.
  • the bending direction of the third reversing portion 1322 is opposite to the bending direction of the first reversing portion 1312 .
  • the third reversing portion 1322 is connected to the same side of the k-th second sub-section and the (k+1)-th second sub-section 1321 .
  • the bending direction of the fourth reversing portion 1323 is opposite to the bending direction of the third reversing portion 1322 .
  • the fourth reversing portion 1323 is connected to the (k+1)th second sub-section 1321 and the (k+2)-th second subsection 1321 on the other same side.
  • the third reversing portion 1322 and the first reversing portion 1312 are connected to form the first connection portion 133 .
  • the plurality of third commutating parts 1322 are connected to the first second sub-segment 1321 and the second second sub-segment 1321 in one-to-one correspondence, and are connected to the third second sub-segment 1321 and the second sub-segment 1321 of the third bar.
  • the four second subsections 1311 are connected to the fifth second subsection 1321 and the sixth second subsection 1311, and are connected to the seventh second subsection 1321 and the eighth second subsection 1321.
  • the plurality of fourth commutating parts 1323 are connected to the second sub-section 1321 of the second bar and the second sub-section 1311 of the third bar in a one-to-one correspondence, and are connected to the second sub-section 1321 of the fourth bar and the second sub-segment of the fifth bar 1311, connected to the second subsection 1321 of Article 6 and the second subsection 1311 of Article 7.
  • the fourth reversing portion 1323 and the second reversing portion 1313 are connected to form a second connection 134 .
  • the first reversing portion 1312 and the third reversing portion 1322 are connected back-to-back at the first connection portion 133 .
  • the second reversing portion 1313 and the fourth reversing portion 1323 are connected back-to-back at the second connection portion 134 .
  • the first reversing portion 1312 , the second reversing portion 1313 , the third reversing portion 1322 and the fourth reversing portion 1323 are all semi-circular arc shapes.
  • the first sub-segment 1311 and the second sub-segment 1321 are both straight, but not limited to this. Square wave linear, etc.
  • the bendability of the bending portion 13 can be further improved.
  • the first reversing portion 1312 and the third reversing portion 1322 are connected by rounded transitions; the second reversing portion 1313 and the third The four reversing parts 1323 are connected by rounded transitions.
  • Such an arrangement avoids excessive stress concentration at the first connection portion 133 and the second connection portion 134 during the bending process.
  • each S-shaped structure undergoes local tensile deformation under the action of bending tensile stress, and the deformation amount is accumulated through each sub-structure to achieve a state of coordinated deformation; at the same time, relative to the S-shaped structure itself
  • the strain that occurs during the bending process is relatively small, and the local stress does not exceed the allowable strength range of the material itself, so permanent plastic deformation will not occur, thus ensuring good bending performance after multiple bending. Fatigue characteristics are reduced, and a certain rebound potential energy is stored at the same time.
  • the support sheet 100 is unfolded, the S-shaped structure rebounds with the release of the rebound potential energy with the unloading of the bending stress, and the hole diameter becomes smaller accordingly, so that the S-shaped structure has good deformation followability and coordination.
  • the distance between two adjacent first subsections 1311 and the distance between two adjacent second subsections 1321 are the same. Such an arrangement improves the stability of the bending portion 13 and reduces the probability of concentration of bending stress.
  • the respective widths of the first connection portion 133 and the second connection portion 134 are X.
  • the width of the first subsection 1311 and the second subsection 1321 is Y.
  • the width of the hole structure formed by the first bending portion 131 and the second bending portion 132 is D.
  • the length of the hole structure formed by the first bending portion 131 and the second bending portion 132 is L.
  • the spacing of the hole structures 135 in the long axis direction is the width of the connection, such as the width of the first connection 133 and the second connection 134; in this embodiment, the first connection 133
  • the width of the second connection portion 134 is equal.
  • the spacing of the hole structures 135 in the short axis direction is the width of the first sub-segment 1311 and the second sub-segment 1321 .
  • the width of the first sub-segment 1311 and the second sub-segment 1321 are equal to each other as an example.
  • the fillet radius of the first connection 133 and the second connection 34 is R, where the value of R can be set according to actual requirements and the range of X. For example, R can be 0.2 mm.
  • the combination of the above parameters is used to improve the bendability of the bending portion 13 and reduce the probability that the bending portion is subjected to the concentration of bending stress.
  • the relationship between the length L of the hole structure 135 in the bending unit 13a and the stress value of the bending unit 13a is: the smaller the stress value.
  • the corresponding relationship between the width D of the hole structure 135 in the bending unit 13a and the stress value of the bending unit 13a is: the larger the D value, the higher the stress value. Big.
  • the corresponding relationship between the spacing (connection) X of the hole structure 135 in the long axis direction of the bending unit 13a and the stress value of the bending unit 13a is: when When X is in the range of 120 ⁇ m to 240 ⁇ m, the larger the X value is, the larger the stress value is.
  • the relationship between the distance Y of the hole structure 135 in the short axis direction (the width of the first subsection) in the bending unit 13a and the stress value is: Y value The larger the value, the greater the stress value.
  • the stress on the bending unit 13a during the bending process should be less than 800 MPa.
  • the failure of the bending unit 13a is related to the material of the support sheet 100, and different materials have different stresses leading to their failure.
  • the material of the support sheet 100 is made of a special metal with high strength and resistance to bending fatigue, but it is not limited thereto.
  • the main metal materials mainly include but are not limited to low-carbon steel, titanium alloy, magnesium alloy and other alloy steels.
  • the present invention further relates to a display module 1000 , which includes an OLED panel 200 , an adhesive layer 300 , and a support plate 100 as described in the above embodiment, which are arranged in sequence; the display module 1000 further includes a driver 400 and flexible circuit board 500.
  • the driver 400 is provided on the flexible circuit board 500 .
  • the flexible circuit board 500 is electrically connected to the OLED panel 200 .
  • the OLED panel 200 includes a bending area 20a and a non-bending area 20b located on both sides of the bending area 20a.
  • the first support body 11 and the second support body 12 are respectively disposed on the In the non-bending area 20b, the bending portion 13 is correspondingly disposed in the bending area 20b.
  • each S-shaped structure undergoes local tensile deformation under the action of bending tensile stress, and the accumulated deformation of each sub-structure matches the deformation of the adjacent film layers to achieve coordinated deformation
  • the strain that occurs during the bending process is relatively small, and the local stress does not exceed the allowable strength range of the material itself, so permanent plastic deformation will not occur, thus ensuring After multiple bending, it can ensure good bending fatigue characteristics and store a certain rebound potential energy at the same time.
  • the display module 1000 is unfolded, with the unloading of the bending stress, the S-shaped structure rebounds under the release of the rebound potential energy, and the hole diameter becomes smaller accordingly, so that it has good deformation follow-up and coordination.
  • the first bending part of the bending part of the supporting sheet is set to be a reciprocating bending structure, and the accumulated deformation of the first bending part is used to supplement the adjacent adhesive layer during the bending process.
  • the deformation difference can reduce the local stress concentration phenomenon, and effectively reduce the aging risk in the bending process of the display module.
  • a support sheet and a display module provided by the embodiments of the present invention have been introduced in detail above.
  • the principles and implementations of the present invention are described with specific examples in this paper.
  • the technical solution of the invention and its core idea; those of ordinary skill in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these modifications or replacements,
  • the essence of the corresponding technical solutions does not deviate from the scope of the technical solutions of the embodiments of the present invention.

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Abstract

一种支撑片（100）及显示模组（1000），在支撑片（100）中，弯折部（13）连接在第一支撑主体（11）和第二支撑主体（12）之间；弯折部（13）包括第一弯折部分（131），第一弯折部分（131）的一端连接于第一支撑主体（11），第一弯折部分（131）的另一端连接于第二支撑主体（12）；自第一支撑主体（11）向第二支撑主体（12）的方向上，第一弯折部分（131）呈往返弯折结构。

Description

支撑片及显示模组 技术领域
本发明涉及一种显示技术领域，特别涉及一种支撑片及显示模组。
 背景技术
典型的OLED柔性屏幕模组主要由保护层、胶层、OLED膜层、触控层、偏光片、支撑片组成。
其中，模组最下一层为特种不锈钢材，简称SUS，起到支撑保护的作用。由于其弹性模量远大于相邻胶层模量，不易发生变形，而临近的胶层一般为光学胶，光学胶为典型的粘弹性材料，在弯折过程中容易产生粘塑性应变。因此，两者之间的力学属性和受力状态的差异性，使得在弯折过程中无法保证一致的随动性与良好的变形协调性，故在弯折过程中SUS与光学胶之间错位相对其他位置较为突出，多次弯折后，容易引起应力集中现象，进而引发脱粘与分离失效问题。
 技术问题
本发明实施例提供一种支撑片及显示模组，以解决现有的显示模组的支撑片和光学胶在弯折过程中容易发生错误，进而引发脱粘和分离失效的技术问题。
 技术解决方案
本发明实施例提供一种支撑片，其包括第一支撑主体、第二支撑主体和弯折部，所述弯折部连接在所述第一支撑主体和所述第二支撑主体之间；
所述弯折部包括至少一个弯折单元，所述弯折单元包括第一弯折部分，所述第一弯折部分的一端连接于所述第一支撑主体，所述第一弯折部分的另一端连接于所述第二支撑主体；
自所述第一支撑主体向所述第二支撑主体的方向上，所述第一弯折部分呈往返弯折结构。
在本发明实施例所述的支撑片中，所述第一弯折部分包括：
多个第一子段，多个所述第一子段间隔且并排设置；
至少一第一换向部，所述第一换向部连接于第k条所述第一子段和第（k+1）条所述第一子段的同一侧；
至少一第二换向部，所述第二换向部的弯曲方向与所述第一换向部的弯曲方向相反，所述第二换向部连接于第（k+1）条所述第一子段和第（k+2）条所述第一子段的另一相同侧；k为奇数或偶数。
在本发明实施例所述的支撑片中，所述第一换向部为弧状或由两段线段形成的折线状。
在本发明实施例所述的支撑片中，所述弯折单元还包括第二弯折部分，所述第二弯折部分的一端连接于所述第一支撑主体，所述第二弯折部分的另一端连接于所述第二支撑主体；
自所述第一支撑主体向所述第二支撑主体的方向上，所述第二弯折部分呈往返弯折结构；
所述第二弯折部分和所述第一弯折部分具有多个第一连接处，多个所述第一连接处间隔设置；所述第一弯折部分的延伸轨迹和所述第二弯折部分的延伸轨迹彼此分离开并在每个所述第一连接处重新合并。
在本发明实施例所述的支撑片中，所述第二弯折部分包括：
多个第二子段，多个所述第二子段间隔且并排设置；
至少一第三换向部，所述第三换向部的弯曲方向与所述第一换向部的弯曲方向相反，所述第三换向部连接于第k条所述第二子段和第（k+1）条所述第二子段的同一侧；
至少一第四换向部，所述第四换向部的弯曲方向与所述第三换向部的弯曲方向相反，所述第四换向部连接于第（k+1）条所述第二子段和第（k+2）条所述第二子段的另一相同侧；
其中，所述第三换向部和所述第一换向部相连形成所述第一连接处。
在本发明实施例所述的支撑片中，所述第一换向部和所述第三换向部之间通过圆角过渡连接。
在本发明实施例所述的支撑片中，相邻两个所述第一子段之间的距离和相邻两个所述第二子段之间的距离相等。
在本发明实施例所述的支撑片中，所述第一换向部和所述第三换向部均为半圆弧状，所述第一连接处的宽度为X，所述第一子段和所述第二子段的宽度为Y，所述第一弯折部分和所述第二弯折部分形成的孔结构的宽度为D，所述第一弯折部分和所述第二弯折部分形成的孔结构的长度为L；
其中，100微米≤X≤220微米，Y≤120微米，D≤200微米，L≤3.2毫米。
在本发明实施例所述的支撑片中，沿着垂直于自所述第一支撑主体向所述第二支撑主体的方向，多个所述弯折单元并排且依次相连设置；
在相邻的两个所述弯折单元之间，所述第四换向部和所述第二换向部相连形成第二连接处。
本发明还涉及一种显示模组，其包括依次设置的OLED面板、胶层和如上述实施例所述的支撑板；
所述OLED面板包括弯折区和位于所述弯折区两侧的非弯折区，所述第一支撑主体、所述第二支撑主体分别一一对应设置于所述非弯折区，所述弯折部对应设置于所述弯折区。
具体的，所述支撑片包括第一支撑主体、第二支撑主体和弯折部，所述弯折部连接在所述第一支撑主体和所述第二支撑主体之间；
所述弯折部包括至少一个弯折单元，所述弯折单元包括第一弯折部分，所述第一弯折部分的一端连接于所述第一支撑主体，所述第一弯折部分的另一端连接于所述第二支撑主体；
自所述第一支撑主体向所述第二支撑主体的方向上，所述第一弯折部分呈往返弯折结构。
在本发明实施例所述的显示模组中，所述第一弯折部分包括：
多个第一子段，多个所述第一子段间隔且并排设置；
至少一第一换向部，所述第一换向部连接于第k条所述第一子段和第（k+1）条所述第一子段的同一侧；
至少一第二换向部，所述第二换向部的弯曲方向与所述第一换向部的弯曲方向相反，所述第二换向部连接于第（k+1）条所述第一子段和第（k+2）条所述第一子段的另一相同侧；k为奇数或偶数。
在本发明实施例所述的显示模组中，所述第一换向部为弧状或由两段线段形成的折线状。
在本发明实施例所述的显示模组中，所述弯折单元还包括第二弯折部分，所述第二弯折部分的一端连接于所述第一支撑主体，所述第二弯折部分的另一端连接于所述第二支撑主体；
自所述第一支撑主体向所述第二支撑主体的方向上，所述第二弯折部分呈往返弯折结构；
所述第二弯折部分和所述第一弯折部分具有多个第一连接处，多个所述第一连接处间隔设置；所述第一弯折部分的延伸轨迹和所述第二弯折部分的延伸轨迹彼此分离开并在每个所述第一连接处重新合并。
在本发明实施例所述的显示模组中，所述第二弯折部分包括：
多个第二子段，多个所述第二子段间隔且并排设置；
至少一第三换向部，所述第三换向部的弯曲方向与所述第一换向部的弯曲方向相反，所述第三换向部连接于第k条所述第二子段和第（k+1）条所述第二子段的同一侧；
至少一第四换向部，所述第四换向部的弯曲方向与所述第三换向部的弯曲方向相反，所述第四换向部连接于第（k+1）条所述第二子段和第（k+2）条所述第二子段的另一相同侧；
其中，所述第三换向部和所述第一换向部相连形成所述第一连接处。
在本发明实施例所述的显示模组中，所述第一换向部和所述第三换向部之间通过圆角过渡连接。
在本发明实施例所述的显示模组中，相邻两个所述第一子段之间的距离和相邻两个所述第二子段之间的距离相等。
在本发明实施例所述的显示模组中，所述第一换向部和所述第三换向部均为半圆弧状，所述第一连接处的宽度为X，所述第一子段和所述第二子段的宽度为Y，所述第一弯折部分和所述第二弯折部分形成的孔结构的宽度为D，所述第一弯折部分和所述第二弯折部分形成的孔结构的长度为L；
其中，100微米≤X≤220微米，Y≤120微米，D≤200微米，L≤3.2毫米。
在本发明实施例所述的显示模组中，沿着垂直于自所述第一支撑主体向所述第二支撑主体的方向，多个所述弯折单元并排且依次相连设置；
在相邻的两个所述弯折单元之间，所述第四换向部和所述第二换向部相连形成第二连接处。
本发明的支撑片及显示模组通过将支撑片的弯折部的第一弯折部分设置为呈往返弯折结构，利用第一弯折部分的累积变形，补充弯折过程中与邻近胶层的变形差值，减少局部应力集中现象，有效降低了显示模组弯折过程中存在的时效风险。
 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面对实施例中所需要使用的附图作简单的介绍。下面描述中的附图仅为本发明的部分实施例，对于本领域普通技术人员而言，在不付出创造性劳动的前提下，还可以根据这些附图获取其他的附图。
图1为本发明实施例的支撑片的结构示意图；
图2为本发明实施例的支撑片的弯折部的部分结构示意图；
图3为本发明实施例的支撑片的弯折单元的结构示意图；
图4为本发明实施例的支撑片的第一弯折部分在弯折前的结构示意图；
图5为本发明实施例的支撑片的第一弯折部分在弯折后的结构示意图；
图6为本发明实施例的支撑片的弯折单元中孔结构长度L与弯折单元所受应力值的趋势图；
图7为本发明实施例的支撑片的弯折单元中孔结构宽度D与弯折单元所受应力值的趋势图；
图8为本发明实施例的支撑片的弯折单元中孔结构在长轴方向上的间距（连接处）X与弯折单元所受应力值的趋势图；
图9为本发明实施例的支撑片的弯折单元中孔结构在短轴方向上的间距（第一子段的宽度）Y与弯折单元所受应力值的趋势图；
图10为本发明实施例的显示模组处于平展状态的俯视结构示意图；
图11为本发明实施例的显示模组处于弯折状态的剖视结构示意图。
 本发明的实施方式
下面将结合本发明实施例中的附图，对本发明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发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，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，都属于本发明保护的范围。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
下文的公开提供了许多不同的实施方式或例子用来实现本发明的不同结构。为了简化本发明的公开，下文中对特定例子的部件和设置进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。此外，本发明提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
请参照图1至图4，图1为本发明实施例的支撑片的结构示意图；图2为本发明实施例的支撑片的弯折部的结构示意图；图3为本发明实施例的支撑片的弯折单元的结构示意图；图4为本发明实施例的支撑片的第一弯折部分在弯折前的结构示意图。
本发明实施例提供一种支撑片100，其包括第一支撑主体11、第二支撑主体12和弯折部13。所述弯折部13连接在所述第一支撑主体11和所述第二支撑主体12之间。
所述弯折部13包括至少一个弯折单元13a。所述弯折单元13a包括第一弯折部分131。所述第一弯折部分131的一端连接于所述第一支撑主体11，所述第一弯折部分131的另一端连接于所述第二支撑主体12。
自所述第一支撑主体11向所述第二支撑主体12的方向上，所述第一弯折部分131呈往返弯折结构。
本实施例的支撑片100通过将弯折部13的第一弯折部分131设置为呈往返弯折结构，利用第一弯折部分131的累积变形，补充弯折过程中与邻近胶层的变形差值，减少局部应力集中现象，有效降低了显示模组弯折过程中存在的时效风险。
比如，如图4和图5所示，一个第一弯折部分131具有n个s型子结构。每个子结构弯折拉伸时，变形量为L0=L2-L1，则累积变形量为n*L0，n为正整数。也即，通过累积变形来弯折部的伸缩性，以此提高支撑片100的可弯折性。
请参照图3，所述弯折单元13a还包括第二弯折部分132。所述第二弯折部分132的一端连接于所述第一支撑主体11，所述第二弯折部分132的另一端连接于所述第二支撑主体12。
自所述第一支撑主体11向所述第二支撑主体12的方向上，所述第二弯折部分132呈往返弯折结构。
所述第二弯折部分132和所述第一弯折部分131具有多个第一连接处133。多个所述第一连接处133间隔设置。在本实施例中，多个第一连接处133并排设置。
所述第一弯折部分131的延伸轨迹和所述第二弯折部分132的延伸轨迹彼此分离开并在每个所述第一连接处133重新合并。
在本实施例中采用第一弯折部分131和第二弯折部分132自第一连接处133彼此分离，又于下一个第一连接处133合并在一起，如此反复的方式形成图案化的双s型结构，在提高弯折部13的可弯折性的情况下，提高了弯折部13的延展性和稳定性。
在本发明实施例所述的支撑片100中，沿着垂直于自所述第一支撑主体11向所述第二支撑主体12的方向，多个所述弯折单元13a并排且依次相连设置。
相邻两个所述弯折单元13a相连形成多个第二连接处134。
在相邻的两个所述弯折单元13a之间，一弯折单元13a的第二弯折部分132的延伸轨迹和另一弯折单元13a的第一弯折部分131的延伸轨迹彼此分离并在每个第二连接处134重新合并。
本实施例将相邻的两个弯折单元13a也进行相连设置，使得整个弯折部13处于连接一体的状态，提高了弯折部13整体的稳定了。其中一体的状态是指弯折部13可以是一体成型的结构，也可以是通过机械连接形成的一体结构。
在本实施例的弯折部13中，第一弯折部分131和第二弯折部分132彼此交替设置且依次连接，使得弯折部13形成一个整体，且由于第一弯折部分131和第二弯折部分132的往返弯折结构，促使弯折部13中形成图案化结构，即在第一弯折部分131和第二弯折部分132之间界定形成多个孔结构135，以进一步释放弯折部13所受的弯折应力。
也就是说，弯折部13的第一弯折部分131和第二弯折部分132在弯折过程中，通过累积形变量达到减少局部应力集中现象，有效降低了显示模组弯折过程中存在的时效风险；而第一弯折部分131和第二弯折部分132直接界定形成的孔结构135，达到释放弯折部13所受弯折应力的效果；并且第一弯折部分131和第二弯折部132彼此的相连，提高了弯折部13整体的稳定性。
具体的，在本发明实施例所述的支撑片100中，所述第一弯折部分131包括多个第一子段1311、至少一第一换向部1312和至少一第二换向部1313。
多个所述第一子段1311间隔且并排设置。所述第一换向部1312连接于第k条所述第一子段和第（k+1）条所述第一子段的同一侧。
所述第二换向部1313的弯曲方向与所述第一换向部1312的弯曲方向相反。所述第二换向部1313连接于第（k+1）条所述第一子段1311和第（k+2）条所述第一子段1311的另一相同侧。k为奇数或偶数。
需要说明的是，k为奇数或偶数，即k包括从1开始的奇数中的至少2个，比如（1、3），（1、3、5），等等；或包括从0开始或2开始的偶数中的至少2个，比如（0、2），（2、4）等。
具体的，如图3所示，多个第一换向部1312一一对应地连接在第1条第一子段1311和第2条第一子段1311，连接在第3条第一子段1311和第4条第一子段1311，连接在第5条第一子段1311和第6条第一段1311，连接在第7条第一子段1311和第8条第一子段1311。
多个第二换向部1313一一对应地连接在第2条第一子段1311和第3条第一子段1311，连接在第4条第一子段1311和第5条第一子段1311，连接在第6条第一子段1311和第7条第一子段1311。
可选的，所述第一换向部1312为弧状或由两段线段形成的折线状，但并不限于此。而第一子段1311和第二子段1321可以是水平段，也可以是倾斜段，亦或者是曲线段。
在本发明实施例所述的支撑片100中，所述第二弯折部分132包括多个第二子段1321、至少一第三换向部1322和至少一第四换向部1323。
多个所述第二子段1321间隔且并排设置。
所述第三换向部1322的弯曲方向与所述第一换向部1312的弯曲方向相反。所述第三换向部1322连接于第k条所述第二子段和第（k+1）条所述第二子段1321的同一侧。
所述第四换向部1323的弯曲方向与所述第三换向部1322的弯曲方向相反。所述第四换向部1323连接于第（k+1）条所述第二子段1321和第（k+2）条所述第二子段1321的另一相同侧。
其中，所述第三换向部1322和所述第一换向部1312相连形成所述第一连接处133。
如图3所示，多个第三换向部1322一一对应地连接在第1条第二子段1321和第2条第二子段1321，连接在第3条第二子段1321和第4条第二子段1311，连接在第5条第二子段1321和第6条第二子段1311，连接在第7条第二子段1321和第8条第二子段1321。
多个第四换向部1323一一对应地连接在第2条第二子段1321和第3条第二子段1311，连接在第4条第二子段1321和第5条第二子段1311，连接在第6条第二子段1321和第7条第二子段1311。
在相邻的两个所述弯折单元13a之间，所述第四换向部1323和所述第二换向部1313相连形成第二连接处134。
其中，第一换向部1312和第三换向部1322于第一连接处133背靠背相连。所述第二换向部1313和所述第四换向部1323于第二连接处134背靠背相连。
在本实施中，可选的，第一换向部1312、第二换向部1313、第三换向部1322和第四换向部1323均为半圆弧状。第一子段1311和第二子段1321均为直线状，但并不限于此，比如第一子段1311和第二子段1321各自可以为高低起伏的曲线状，比如波浪线、脉冲线或方波线状，等等。
当第一子段1311和第二子段1321为高低起伏的曲线状时，能进一步的提高弯折部13的可弯折性。
在本发明实施例所述的支撑片100中，所述第一换向部1312和所述第三换向部1322之间通过圆角过渡连接；所述第二换向部1313和所述第四换向部1323之间通过圆角过渡连接。这样的设置避免了在弯折过程中，第一连接处133和第二连接处134应力过于集中。
另外，支撑片100在弯折时，各S型结构在弯曲拉应力的作用下发生局部拉伸变形，且通过各子结构累积变形量，以达到协调变形的状态；同时相对于S型结构本身而言，弯折过程中所发生的应变相对较小，局部应力不超过材料本身的许用强度范围，故此不会发生永久性塑性变形，从而保证了在多次弯折后能够保证良好的弯折疲劳特性，同时存储了一定的回弹势能。支撑片100在展开时，S型结构随着弯折应力的卸载，在回弹势能的释放下发生回弹，孔洞直径相应变小，从而具备良好的变形随动性和协调性。
可选的，相邻两个所述第一子段1311之间的距离和相邻两个所述第二子段1321之间的距离相等。这样的设置提高了弯折部13的稳定性，且减低了弯折应力集中的概率。
在本实施例中，如图3所示，所述第一连接处133和第二连接处134各自的宽度为X。所述第一子段1311和所述第二子段1321的宽度为Y。所述第一弯折部分131和所述第二弯折部分132形成的孔结构的宽度为D。所述第一弯折部分131和所述第二弯折部分132形成的孔结构的长度为L。
具体的，在弯折单元13a中，孔结构135在长轴方向上的间距为连接处的宽度，比如第一连接处133和第二连接处134的宽度；本实施例以第一连接处133和第二连接处134的宽度相等为例。孔结构135在短轴方向上的间距为第一子段1311和第二子段1321的宽度，本实施例以第一子段1311和第二子段1321的宽度相等为例。另外，第一连接处133和第二连接处34的圆角半径为R，其中R的取值可根据实际需求和X的范围进行设定。比如R可以为0.2毫米。
本实施例通过上述参数的联合设置，以提高弯折部13的可弯折性能，以及降低弯折部受到弯折应力集中的概率。
在本实施例中，如图6所示，在其他参数值一定的条件下，弯折单元13a中孔结构135长度L与弯折单元13a所受应力值的关系是：L越大，所受的应力值越小。
如图7所示，在其他参数值一定的条件下，弯折单元13a中孔结构135宽度D与弯折单元13a所受应力值的对应关系是：D值越大，所受的应力值越大。
如图8所示，在其他参数值一定的条件下，弯折单元13a中孔结构135在长轴方向上的间距（连接处）X与弯折单元13a所受应力值的对应关系是：当X处于120微米至240微米的区间内时，X值越大，所受的应力值越大。
如图9所示，在其他参数值一定的条件下，弯折单元13a中孔结构135在短轴方向上的间距（第一子段的宽度）Y与所受应力值的关系是：Y值越大，所受应力值越大。
另外，在图6-图9中，本实施例的弯折单元13a中，当所受应力达到800兆帕时，弯折单元13a出现失效。因此为了降低弯折单元13a在弯折的过程中出现失效的概率，则要使得弯折单元13a在弯折过程中所受的应力在800兆帕以下。
因此，100微米≤X≤220微米，Y≤120微米，D≤200微米，L≤3.2毫米；以降低弯折单元失效的概率。
当然，弯折单元13a的失效跟支撑片100的材料有关，不同的材料，导致其失效的应力是不同的。
在本实施例中，支撑片100的材料采用高强度、抗弯折疲劳的特种金属制作，但不限于此。其中金属主要材料主要包括但不限定于低碳钢、钛合金、镁合金等各类合金钢。
请参照图10和图11，本发明还涉及一种显示模组1000，其包括依次设置的OLED面板200、胶层300、如上述实施例所述的支撑板100；显示模组1000还包括驱动器400和柔性电路板500。驱动器400设置在柔性电路板500上。柔性电路板500电性连接于OLED面板200。
所述OLED面板200包括弯折区20a和位于所述弯折区20a两侧的非弯折区20b，所述第一支撑主体11、所述第二支撑主体12分别一一对应设置于所述非弯折区20b，所述弯折部13对应设置于所述弯折区20b。
显示模组1000在弯折时，各S型结构在弯曲拉应力的作用下发生局部拉伸变形，且通过各子结构累积变形量，与相邻膜层的变形量相互匹配，以达到协调变形的状态；同时相对于S型结构本身而言，弯折过程中所发生的应变相对较小，局部应力不超过材料本身的许用强度范围，故此不会发生永久性塑性变形，从而保证了在多次弯折后能够保证良好的弯折疲劳特性，同时存储了一定的回弹势能。显示模组1000在展开时，S型结构随着弯折应力的卸载，在回弹势能的释放下发生回弹，孔洞直径相应变小，从而具备良好的变形随动性和协调性。
本发明的支撑片及显示模组通过将支撑片的弯折部的第一弯折部分设置为呈往返弯折结构，利用第一弯折部分的累积变形，补充弯折过程中与邻近胶层的变形差值，减少局部应力集中现象，有效降低了显示模组弯折过程中存在的时效风险。
以上对本发明实施例所提供的一种支撑片及显示模组进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明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发明各实施例的技术方案的范围。

Claims (20)

  1. 一种支撑片，其包括第一支撑主体、第二支撑主体和弯折部，所述弯折部连接在所述第一支撑主体和所述第二支撑主体之间；
    所述弯折部包括至少一个弯折单元，所述弯折单元包括第一弯折部分，所述第一弯折部分的一端连接于所述第一支撑主体，所述第一弯折部分的另一端连接于所述第二支撑主体；
    自所述第一支撑主体向所述第二支撑主体的方向上，所述第一弯折部分呈往返弯折结构。
  2. 根据权利要求1所述的支撑片，其中，所述弯折单元还包括第二弯折部分，所述第二弯折部分的一端连接于所述第一支撑主体，所述第二弯折部分的另一端连接于所述第二支撑主体；
    自所述第一支撑主体向所述第二支撑主体的方向上，所述第二弯折部分呈往返弯折结构；
    所述第二弯折部和所述第一弯折部具有多个第一连接处，多个所述第一连接处间隔设置；所述第一弯折部的延伸轨迹和所述第二弯折部的延伸轨迹彼此分离开并在每个所述第一连接处重新合并。
  3. 根据权利要求2所述的支撑片，其中，沿着垂直于自所述第一支撑主体向所述第二支撑主体的方向，多个所述弯折单元并排且依次相连设置；
    在相邻的两个所述弯折单元之间，一所述弯折单元的第二弯折部和另一所述弯折单元的第一弯折部具有多个第二连接处，多个所述第二连接处间隔设置；
    在相邻的两个所述弯折单元之间，一所述弯折单元的第二弯折部分的延伸轨迹和另一所述弯折单元的第一弯折部分的延伸轨迹彼此分离并在每个所述第二连接处重新合并。
  4. 根据权利要求3所述的支撑片，其中，所述第一弯折部分包括：
    多个第一子段，多个所述第一子段间隔且并排设置；
    至少一第一换向部，所述第一换向部连接于第k条所述第一子段和第（k+1）条所述第一子段的同一侧；
    至少一第二换向部，所述第二换向部的弯曲方向与所述第一换向部的弯曲方向相反，所述第二换向部连接于第（k+1）条所述第一子段和第（k+2）条所述第一子段的另一相同侧；k为奇数或偶数。
  5. 根据权利要求4所述的支撑片，其中，所述第二弯折部分包括：
    多个第二子段，多个所述第二子段间隔且并排设置；
    至少一第三换向部，所述第三换向部的弯曲方向与所述第一换向部的弯曲方向相反，所述第三换向部连接于第k条所述第二子段和第（k+1）条所述第二子段的同一侧；
    至少一第四换向部，所述第四换向部的弯曲方向与所述第三换向部的弯曲方向相反，所述第四换向部连接于第（k+1）条所述第二子段和第（k+2）条所述第二子段的另一相同侧；
    其中，所述第三换向部和所述第一换向部相连形成所述第一连接处。
  6. 根据权利要求5所述的支撑片，其中，在相邻的两个所述弯折单元之间，所述第四换向部和所述第二换向部相连形成第二连接处。
  7. 根据权利要求4所述的支撑片，其中，所述第一换向部为弧状或由两段线段形成的折线状。
  8. 根据权利要求5所述的支撑片，其中，所述第一换向部和所述第三换向部之间通过圆角过渡连接。
  9. 根据权利要求8所述的支撑片，其中，相邻两个所述第一子段之间的距离和相邻两个所述第二子段之间的距离相等。
  10. 根据权利要求9所述的支撑片，其中，所述第一换向部和所述第三换向部均为半圆弧状，所述第一连接处的宽度为X，所述第一子段和所述第二子段的宽度为Y，所述第一弯折部分和所述第二弯折部分形成的孔结构的宽度为D，所述第一弯折部分和所述第二弯折部分形成的孔结构的长度为L；
    其中，100微米≤X≤220微米，Y≤120微米，D≤200微米，L≤3.2毫米。
  11. 一种显示模组，其中，包括依次设置的OLED面板、胶层和支撑板；
    所述OLED面板包括弯折区和位于所述弯折区两侧的非弯折区；所述支撑片包括第一支撑主体、第二支撑主体和弯折部，所述弯折部连接在所述第一支撑主体和所述第二支撑主体之间；所述第一支撑主体、所述第二支撑主体分别一一对应设置于所述非弯折区，所述弯折部对应设置于所述弯折区；
    所述弯折部包括至少一个弯折单元，所述弯折单元包括第一弯折部分，所述第一弯折部分的一端连接于所述第一支撑主体，所述第一弯折部分的另一端连接于所述第二支撑主体；
    自所述第一支撑主体向所述第二支撑主体的方向上，所述第一弯折部分呈往返弯折结构。
  12. 根据权利要求11所述的显示模组，其中，所述弯折单元还包括第二弯折部分，所述第二弯折部分的一端连接于所述第一支撑主体，所述第二弯折部分的另一端连接于所述第二支撑主体；
    自所述第一支撑主体向所述第二支撑主体的方向上，所述第二弯折部分呈往返弯折结构；
    所述第二弯折部和所述第一弯折部具有多个第一连接处，多个所述第一连接处间隔设置；所述第一弯折部的延伸轨迹和所述第二弯折部的延伸轨迹彼此分离开并在每个所述第一连接处重新合并。
  13. 根据权利要求12所述的显示模组，其中，沿着垂直于自所述第一支撑主体向所述第二支撑主体的方向，多个所述弯折单元并排且依次相连设置；
    在相邻的两个所述弯折单元之间，一所述弯折单元的第二弯折部和另一所述弯折单元的第一弯折部具有多个第二连接处，多个所述第二连接处间隔设置；
    在相邻的两个所述弯折单元之间，一所述弯折单元的第二弯折部分的延伸轨迹和另一所述弯折单元的第一弯折部分的延伸轨迹彼此分离并在每个所述第二连接处重新合并。
  14. 根据权利要求13所述的显示模组，其中，所述第一弯折部分包括：
    多个第一子段，多个所述第一子段间隔且并排设置；
    至少一第一换向部，所述第一换向部连接于第k条所述第一子段和第（k+1）条所述第一子段的同一侧；
    至少一第二换向部，所述第二换向部的弯曲方向与所述第一换向部的弯曲方向相反，所述第二换向部连接于第（k+1）条所述第一子段和第（k+2）条所述第一子段的另一相同侧；k为奇数或偶数。
  15. 根据权利要求14所述的显示模组，其中，所述第二弯折部分包括：
    多个第二子段，多个所述第二子段间隔且并排设置；
    至少一第三换向部，所述第三换向部的弯曲方向与所述第一换向部的弯曲方向相反，所述第三换向部连接于第k条所述第二子段和第（k+1）条所述第二子段的同一侧；
    至少一第四换向部，所述第四换向部的弯曲方向与所述第三换向部的弯曲方向相反，所述第四换向部连接于第（k+1）条所述第二子段和第（k+2）条所述第二子段的另一相同侧；
    其中，所述第三换向部和所述第一换向部相连形成所述第一连接处。
  16. 根据权利要求15所述的显示模组，其中，在相邻的两个所述弯折单元之间，所述第四换向部和所述第二换向部相连形成第二连接处。
  17. 根据权利要求14所述的显示模组，其中，所述第一换向部为弧状或由两段线段形成的折线状。
  18. 根据权利要求15所述的显示模组，其中，所述第一换向部和所述第三换向部之间通过圆角过渡连接。
  19. 根据权利要求18所述的显示模组，其中，相邻两个所述第一子段之间的距离和相邻两个所述第二子段之间的距离相等。
  20. 根据权利要求19所述的显示模组，其中，所述第一换向部和所述第三换向部均为半圆弧状，所述第一连接处的宽度为X，所述第一子段和所述第二子段的宽度为Y，所述第一弯折部分和所述第二弯折部分形成的孔结构的宽度为D，所述第一弯折部分和所述第二弯折部分形成的孔结构的长度为L；
    其中，100微米≤X≤220微米，Y≤120微米，D≤200微米，L≤3.2毫米。
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