WO2024216686A1 - 可折叠显示模组及可折叠显示装置 - Google Patents

可折叠显示模组及可折叠显示装置 Download PDF

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Publication number
WO2024216686A1
WO2024216686A1 PCT/CN2023/093854 CN2023093854W WO2024216686A1 WO 2024216686 A1 WO2024216686 A1 WO 2024216686A1 CN 2023093854 W CN2023093854 W CN 2023093854W WO 2024216686 A1 WO2024216686 A1 WO 2024216686A1
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WIPO (PCT)
Prior art keywords
glass substrate
foldable
layer
display module
main structure
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2023/093854
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English (en)
French (fr)
Inventor
韩文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Original Assignee
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Application filed by Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd filed Critical Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority to KR1020237039493A priority Critical patent/KR20240155746A/ko
Priority to US18/269,782 priority patent/US20250048914A1/en
Publication of WO2024216686A1 publication Critical patent/WO2024216686A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • 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
    • 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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/129—Chiplets
    • 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
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • 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
    • H10K59/40—OLEDs integrated with touch screens
    • 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
    • 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
    • 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
    • H10K59/873—Encapsulations
    • 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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
    • 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
    • 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
    • H10K2102/351—Thickness

Definitions

  • the present application relates to the field of display technology, and in particular to a foldable display module and a foldable display device.
  • foldable display devices have become the mainstream development direction of the display industry. From small-sized foldable mobile phones to medium-sized and large-sized foldable laptops, foldable display devices are becoming more and more popular with users due to their advantages of easy storage and high portability. However, foldable display devices are prone to creases during use, which seriously affect the user experience.
  • the purpose of the present application is to provide a foldable display module and a foldable display device to improve the problem that the foldable display module and the foldable display device are prone to creases during use.
  • the present application provides a foldable display module, wherein the foldable display module has a foldable area and a non-foldable area adjacent to the foldable area, and the foldable display module comprises:
  • a glass substrate is located on the back side of the light emitting surface of the display main structure, and the thickness of the portion of the glass substrate corresponding to the foldable area is less than or equal to 100 micrometers.
  • the present application also provides a foldable display device, which includes: the above-mentioned foldable display module.
  • the thickness of the part of the glass substrate corresponding to the foldable area is less than or equal to 100 microns, and the part of the glass substrate corresponding to the foldable area is thinned to be flexible, so that the part of the glass substrate corresponding to the foldable area can be folded.
  • the glass substrate itself has rigidity
  • the display main structure is set on the glass substrate, so that the glass substrate and the display main structure constitute a foldable display panel that is both rigid and flexible. In other words, the glass substrate and the display main structure constitute a hybrid foldable display panel.
  • the glass substrate provides rigid support, it is conducive to omitting the back plate and foam layer and other supporting components located on the back side of the flexible display panel in the traditional technology, and then omitting the glue layer on the back side of the flexible display panel, improving the crease problem of the foldable display module caused by the plastic deformation of the glue layer.
  • FIG1 is a cross-sectional schematic diagram of a foldable display module in the related art
  • FIG2 is a first cross-sectional schematic diagram of a foldable display module according to an embodiment of the present application.
  • FIG3 is a second cross-sectional schematic diagram of a foldable display module according to an embodiment of the present application.
  • FIG4 is a third cross-sectional schematic diagram of a foldable display module according to an embodiment of the present application.
  • FIG5 is a fourth cross-sectional schematic diagram of a foldable display module according to an embodiment of the present application.
  • FIG6 is a fifth cross-sectional schematic diagram of a foldable display module according to an embodiment of the present application.
  • FIG7 is a first cross-sectional schematic diagram of a foldable display module according to another embodiment of the present application.
  • FIG8 is a second cross-sectional schematic diagram of a foldable display module according to another embodiment of the present application.
  • FIG. 9 is a schematic cross-sectional view of a foldable display device according to an embodiment of the present application.
  • FIG. 1 is a cross-sectional schematic diagram of a foldable display module in the related art.
  • the foldable display module 100 has a foldable area 100a and two non-foldable areas 100b, and the two non-foldable areas 100b are adjacent to opposite sides of the foldable area 100a.
  • the foldable display module 100 includes a flexible display panel 01, a first module 02, and a second module 03.
  • the first module 02 is located on the light-emitting side of the flexible display panel 01
  • the second module 03 is located on the back side of the light-emitting side of the flexible display panel 01.
  • the flexible display panel 01 includes a flexible substrate 011, a driving circuit layer 012, a light-emitting device layer 013, and a thin film encapsulation layer 014 stacked in sequence.
  • the light-emitting device layer 013 includes a plurality of light-emitting devices, and the light-emitting devices are organic light-emitting diodes, but are not limited thereto, and the light-emitting devices may also be quantum light-emitting diodes.
  • the flexible substrate 011 is a polymer substrate.
  • the first module 02 includes a touch layer 021, a polarizer 022, an ultra-thin glass 023, a protective cover 024, a first adhesive layer 0251, a second adhesive layer 0252, a third adhesive layer 0253, and a fourth adhesive layer 0254.
  • the first adhesive layer 0251, the second adhesive layer 0252, the third adhesive layer 0253, and the fourth adhesive layer 0254 are all transparent optical clear adhesives (OCA).
  • the first adhesive layer 0251 adheres the touch layer 021 to the thin film encapsulation layer 014 of the flexible display panel 01.
  • the second adhesive layer 0252 adheres the touch layer 021 to the polarizer 022.
  • the third adhesive layer 0253 adheres the polarizer 022 to the ultra-thin glass 023.
  • the fourth adhesive layer 0254 adheres the ultra-thin glass 023 to the protective cover 024.
  • the protective cover 024 is a transparent polymer substrate.
  • the second module 03 includes a back plate 031, a foam layer 032, a metal support layer 033, a fifth adhesive layer 0341, a sixth adhesive layer 0342, and a seventh adhesive layer 0343.
  • the fifth adhesive layer 0341, the sixth adhesive layer 0342, and the seventh adhesive layer 0343 are all pressure sensitive adhesive layers (PSA).
  • the fifth adhesive layer 0341 adheres the flexible substrate 011 of the flexible display panel 01 to the back plate 031 .
  • the sixth adhesive layer 0342 adheres the back plate 031 to the foam layer 032 .
  • the seventh adhesive layer 0343 adheres the metal support layer 033 to the foam layer 032 .
  • creases are likely to appear on the foldable display module 100 after being folded multiple times, which affects the appearance of the foldable display module 100 .
  • the inventor disassembled the foldable display module 100 in the related art and found through analysis that the presence of a film layer in the foldable display module 100 that is prone to plastic deformation is a key factor that causes creases to easily form.
  • the optical adhesive layer and the pressure-sensitive adhesive layer in the foldable display module 100 are both prone to plastic deformation.
  • the present application reduces the number of adhesive layers in the foldable display module or even completely removes the adhesive layers in the foldable display module to improve the problem of creases in the foldable display module caused by plastic deformation of the adhesive layers.
  • the specific scheme of the present application includes using a glass substrate as a carrier of the display main structure, the thickness of the part of the glass substrate corresponding to the foldable area is less than or equal to 100 microns, and then the part of the glass substrate corresponding to the foldable area is thinned to be flexible, so that the part of the glass substrate corresponding to the foldable area can be folded, and the glass substrate itself has rigidity, and the display main structure is set on the glass substrate, so that the glass substrate and the display main structure constitute a foldable display panel that is both rigid and flexible.
  • the glass substrate and the display main structure constitute a hybrid foldable display panel.
  • the glass substrate provides rigid support, it is conducive to omitting the back plate and foam layer and other supporting components located on the back side of the flexible display panel in the traditional technology, and then omitting the glue layer on the back side of the flexible display panel, improving the crease problem of the foldable display module caused by the plastic deformation of the glue layer.
  • FIG. 2 is a first cross-sectional schematic diagram of a foldable display module according to an embodiment of the present application.
  • the foldable display module 200 has a foldable area 200a and a non-foldable area 200b adjacent to the foldable area 200a, and two non-foldable areas 200b are adjacent to opposite sides of one foldable area 200a.
  • the foldable display module 200 is in a flattened state; when the foldable area 200a and the non-foldable area 200b are respectively located in intersecting planes, the foldable display module 200 is in a folded state.
  • the number of the foldable regions 200a may be one or more. Specifically, the number of the foldable regions 200a is one, and the number of the non-foldable regions 200b is two.
  • the foldable display module 200 includes a glass substrate 041 and a display main structure 04 stacked in sequence, and the glass substrate 041 is located on the back side of the light emitting surface of the display main structure 04 .
  • the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a is less than or equal to 100 microns, so that the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a is thinned to be flexible, so that the portion of the glass substrate 041 corresponding to the foldable area 200a can be folded.
  • the glass substrate is generally used as a rigid substrate for the hard display panel in the related technology, and the thickness of the glass substrate is generally 480 microns to 600 microns. Due to the thick thickness of the glass substrate, the hard display panel cannot be folded, and because the glass substrate is thick and cannot be folded when used as a rigid substrate, it is not currently used in foldable display panels.
  • the present application innovatively uses an initial glass substrate with a thickness of 480 to 600 microns as a substrate, and after forming the display main structure 04 and the like on the initial glass substrate, the initial glass substrate is thinned so that the thickness of the portion of the initial glass substrate corresponding to the foldable area is thinned to less than or equal to 100 microns, thereby ensuring that the portion of the glass substrate corresponding to the foldable area is foldable.
  • this is beneficial for the foldable display panel including the thinned glass substrate to have both flexibility and rigidity.
  • the ultra-thin glass 023 in the related art cannot be directly used as a carrier of the display main structure 04 due to its too thin thickness.
  • the ultra-thin glass 023 when used as a rigid carrier, it needs to be attached to the back side of the light-emitting surface of the display main structure 04 with the help of an adhesive layer, and the adhesive layer increases the risk of creases in the foldable display module 200 during the folding process.
  • the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a is greater than 0 micrometers, so that the portion of the glass substrate 041 corresponding to the foldable area 200a can be folded, and the portion of the glass substrate 041 corresponding to the foldable area 200a can provide rigid support and play a protective role, and the glass substrate 041 and the display main structure 04 constitute a hybrid foldable display panel.
  • the portion of the glass substrate 041 corresponding to the foldable area 200a is composed of a rigid material, and the portion of the glass substrate 041 corresponding to the foldable area 200a will not produce plastic deformation.
  • the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a is greater than or equal to 10 micrometers, so as to ensure that the portion of the glass substrate 041 corresponding to the foldable area 200a has rigid support while meeting the thinning process accuracy of the glass substrate.
  • the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a may also be greater than or equal to 20 microns and less than or equal to 90 microns; alternatively, the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a may also be greater than or equal to 30 microns and less than or equal to 80 microns; alternatively, the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a may also be greater than or equal to 40 microns and less than or equal to 60 microns; alternatively, the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a may be greater than or equal to 12 microns and less than or equal to 18 microns.
  • the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a can be 10 microns, 15 microns, 18 microns, 20 microns, 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, 55 microns, 60 microns, 65 microns, 75 microns, 80 microns, 85 microns, 90 microns, 95 microns or 100 microns.
  • the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a is equal to the thickness H2 of the portion of the glass substrate 041 corresponding to the non-foldable area 200b, so as to ensure that the portion of the glass substrate 041 corresponding to the foldable area 200a is foldable while ensuring the flatness of the glass substrate 041, thereby ensuring the flatness of the foldable display module 200.
  • the thickness H2 of the portion of the glass substrate 041 corresponding to the non-foldable area 200 b is greater than or equal to 10 micrometers and less than or equal to 100 micrometers.
  • the thickness H2 of the portion of the glass substrate 041 corresponding to the non-foldable area 200b is 10 microns, 15 microns, 18 microns, 20 microns, 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, 55 microns, 60 microns, 65 microns, 75 microns, 80 microns, 85 microns, 90 microns, 95 microns or 100 microns.
  • an initial glass substrate with a thickness of 480 to 520 microns is used as a substrate.
  • the surface of the initial glass substrate away from the display main structure 04 is thinned as a whole to obtain a glass substrate 041 with a thickness of 10 to 100 microns, and the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a is equal to the thickness H2 of the portion of the glass substrate 041 corresponding to the non-foldable area 200b.
  • the method of thinning the glass substrate includes but is not limited to mechanical grinding and chemical etching.
  • the surface 041b of the glass substrate 041 away from the display main structure 04 is obtained through thinning treatment, the surface 041b of the glass substrate 041 away from the display main structure 04 is relatively rough; while the surface 041c of the glass substrate 041 close to the display main structure 04 is not processed, and the surface 041c of the glass substrate 041 close to the display main structure 04 is relatively smooth. Therefore, in the thickness direction of the glass substrate 041, the roughness of the surface 041b of the glass substrate 041 away from the display main structure 04 is greater than the roughness of the surface 041c of the glass substrate 041 close to the display main structure 04.
  • the display main structure 04 includes a display pixel layer 042 and a thin film encapsulation layer 043 .
  • the display pixel layer 042 is located on one side of the glass substrate 041. Specifically, the display pixel layer 042 is located on the surface of the glass substrate 041. In other words, the display pixel layer 042 is in direct contact with the surface of the glass substrate 041.
  • the display pixel layer 042 is in direct contact with the surface of the glass substrate 041, there is no flexible substrate between the glass substrate 041 and the display pixel layer 042, so as to improve the folding problem of the foldable display module 200 caused by the plastic deformation of the flexible substrate.
  • the material of the flexible substrate includes but is not limited to polyimide.
  • the glass substrate 041 can play a supporting role, and the flexible substrate can also be omitted.
  • direct contact between two film layers means that there is no other film layer between the two film layers, for example, there is no glue layer between the two film layers.
  • the display pixel layer 042 includes a driving circuit layer 0421 and a light emitting device layer 0422, and the light emitting device layer 0422 is located on the surface of the driving circuit layer 0421 away from the glass substrate 041.
  • the driving circuit layer 0421 includes a plurality of driving circuits
  • the light emitting device layer 0422 includes a plurality of light emitting devices, and the light emitting devices are electrically connected to the driving circuits.
  • the light emitting devices are organic light emitting diodes, but are not limited thereto, and the light emitting devices may also be quantum dot light emitting diodes, etc.
  • the thin film encapsulation layer 043 is used to encapsulate the display pixel layer 042 to extend the service life of the display main structure 04.
  • the thin film encapsulation layer 043 is located on the side of the display pixel layer 042 away from the glass substrate 041, and the thin film encapsulation layer 043 covers the display pixel layer 042.
  • the thin film encapsulation layer 043 includes two inorganic layers and an organic layer between the two inorganic layers.
  • the material of the inorganic layer includes but is not limited to at least one of silicon nitride, silicon oxide and aluminum oxide.
  • the material of the organic layer includes but is not limited to at least one of polyimide and polyacrylate.
  • the foldable display module 200 of this embodiment does not include supporting bodies such as a back plate, a foam layer, and a metal layer that play a supporting role in the related art, so as to reduce the number of adhesive layers located on the back side of the light-emitting surface of the display main structure 04, or even completely remove the adhesive layer located on the back side of the light-emitting surface of the display main structure 04, thereby improving the crease problem caused by the plastic deformation of the adhesive layer of the foldable display module 200.
  • supporting bodies such as a back plate, a foam layer, and a metal layer that play a supporting role in the related art
  • the foldable display module 200 further includes a functional module 05, which is located on a surface of the display main structure 04 away from the glass substrate 041 and includes at least two stacked functional layers 051, and any two adjacent functional layers 051 are in contact with each other.
  • a functional module 05 which is located on a surface of the display main structure 04 away from the glass substrate 041 and includes at least two stacked functional layers 051, and any two adjacent functional layers 051 are in contact with each other.
  • the functional module 05 is located on the surface of the thin film encapsulation layer 043 away from the display pixel layer 042.
  • the functional module 05 includes at least two functional layers 051, and any two adjacent functional layers 051 are in direct contact with each other.
  • the functional module 05 is located on the surface of the thin film encapsulation layer 043 away from the display pixel layer 042, so that the functional module 05 is in direct contact with the thin film encapsulation layer 043, and the glue layer between the functional module 05 and the thin film encapsulation layer 043 is removed, thereby improving the folding problem of the foldable display module 200 caused by the plastic deformation of the glue layer.
  • any two film layers in the functional module 05 are in direct contact, so that the glue layer between any two film layers of the functional module 05 is also removed, reducing the glue layer in the functional module 05, and further improving the folding problem of the foldable display module 200 caused by the plastic deformation of the glue layer.
  • the functional module 05 is located on the surface of the thin film encapsulation layer 043 away from the display pixel layer 042, and the functional module 05 includes at least two functional layers 051, and any two adjacent functional layers 051 are in direct contact with each other, so that the four adhesive layers on the light-emitting side of the flexible display panel 01 in the related art are removed.
  • the functional layer 051 includes but is not limited to at least one of a touch layer, an optical functional layer and a light-transmitting protective layer.
  • the optical functional layer includes but is not limited to a color filter layer and an optical lens layer.
  • the light-transmitting protective layer includes a hard coating layer and the like.
  • the functional module 05 includes a touch layer 052, a color filter layer 053, and a hard coating layer 054.
  • the touch layer 052 is located on the surface of the display main structure 04 away from the glass substrate 041.
  • the color filter layer 053 is located on the surface of the touch layer 052 away from the display main structure 04.
  • the hard coating layer 054 is located on the surface of the color filter layer 053 away from the touch layer 052.
  • the touch layer 052 is located on the surface of the thin film encapsulation layer 043 away from the display pixel layer 042.
  • the color filter layer 053 is located on the surface of the touch layer 052 away from the thin film encapsulation layer 043.
  • the hard coating layer 054 is located on the surface of the color filter layer 053 away from the touch layer 052.
  • the touch layer 052 includes touch electrodes and touch electrode wires connected to the touch electrodes.
  • the touch electrodes include mutual capacitance touch electrodes or self capacitance touch electrodes.
  • the touch layer 052 is directly prepared on the thin film encapsulation layer 043, so the touch layer 052 is directly attached to the display main structure 04.
  • the color filter layer 053 includes a black matrix layer and a plurality of photoresist units, the black matrix layer includes a plurality of openings, and the plurality of photoresist units are disposed one-to-one in the plurality of openings.
  • the color filter layer 053 is formed directly on the touch layer 052 , so the color filter layer 053 is directly attached to the touch layer 052 .
  • the present embodiment uses a color filter layer 053 to replace the polarizer in the conventional technology.
  • the color filter layer 053 can be directly formed on the touch layer 052 without the need for a glue layer, which is beneficial to reducing the glue layer in the functional module 05 .
  • the hard coating layer 054 protects the functional film layer below it.
  • the material of the hard coating layer 054 includes a cured optical adhesive layer, so that the hard coating layer 054 can be directly formed on the surface of the color filter layer 053 away from the touch layer 052 through a coating and curing process.
  • the material of the cured optical adhesive layer includes but is not limited to at least one of an acrylic resin, an epoxy resin, and a polyurethane.
  • the hard coating 054 may also include an inorganic layer, and the material of the inorganic layer includes but is not limited to at least one of silicon nitride, silicon oxide and aluminum oxide.
  • the present application replaces the traditional ultra-thin glass and protective cover with a hard coating 054, so that the hard coating 054 can protect the functional layer below it.
  • ultra-thin glass and protective cover require a glue layer for attachment. Since the hard coating 054 can be formed on other film layers by coating and other methods without a glue layer, it is beneficial to reduce the glue layer in the functional module 05.
  • the hard coating is formed on a flexible substrate as a protective cover, but the flexible substrate is prone to creases during the folding process. In the present application, the hard coating 054 is directly formed on the color filter layer 053, and the flexible substrate can be omitted, which is more conducive to improving the problem of foldable display module 200 being prone to creases during the folding process.
  • the inventors of the present application have also innovatively discovered that, since the glass substrate is used as a rigid supporting substrate for the display main structure 04, the glass substrate is rigid and not easily deformed internally under the action of external forces, when the material of the hard coating 054 includes a cured optical adhesive layer, when the hard coating 054 is obtained by curing, the stress generated during the curing process has little effect on the film layer below it.
  • the stress generated during the curing process will affect the performance of some film layers below it.
  • the functional module 05 may include only one or two of the touch layer 052 , the color filter layer 053 and the hard coating layer 054 . At least one of the touch layer 052 and the color filter layer 053 may also be integrated into the display main structure 04 .
  • only the light-emitting side of the display main structure 04 may be free of an optical adhesive layer, or the back side of the light-emitting side of the display main structure 04 may be free of a pressure-sensitive adhesive layer, so as to improve problems such as bubbles, bumps and concave-convex points, and bonding marks caused by bonding of the adhesive layer in the foldable display module.
  • FIG3 is a second cross-sectional schematic diagram of a foldable display module of an embodiment of the present application.
  • the foldable display module 200 shown in FIG3 is substantially similar to the foldable display module 200 shown in FIG2, and the similarities are not repeated.
  • the differences include that the foldable display module 200 shown in FIG3 further includes an elastic buffer layer 06, and the elastic buffer layer 06 is located on the side of the glass substrate 041 away from the display pixel layer 042, and the elastic buffer layer 06 is in direct contact with the surface of the glass substrate 041 away from the display pixel layer 042, so that there is no glue layer between the elastic buffer layer 06 and the glass substrate 041.
  • the elastic properties of the elastic buffer layer 06 protect the glass substrate 041 while improving the problem that the foldable display module 200 is prone to creases due to the glue layer.
  • the elastic buffer layer 06 is located in the foldable area 200a and the non-foldable area 200b.
  • the elastic buffer layer 06 overlaps with the display area of the foldable display module 200 to protect the display area of the foldable display module 200 .
  • the material of the elastic buffer layer 06 includes at least one of a glue material and an elastic resin.
  • the material of the glue material includes but is not limited to at least one of a liquid optical glue (Optical Clear Resin, OCR) and a solid optical glue.
  • Liquid optical glue includes but is not limited to epoxy resin, acrylate resin and polyurethane.
  • Solid optical glue includes but is not limited to polysiloxane, epoxy resin and polyurethane.
  • Elastic resin includes elastic resin, and elastic resin includes but is not limited to silicone and thermoplastic polyurethane.
  • the material of the elastic buffer layer 06 is an elastic resin to ensure that the elastic buffer layer 06 has good buffering performance.
  • the elastic buffer layer 06 made of elastic resin has good resilience, and the elastic buffer layer 06 is more difficult to produce plastic deformation than the optical adhesive layer and the pressure-sensitive adhesive layer, which is also conducive to improving the crease problem of the foldable display module caused by the plastic deformation of the adhesive layer.
  • the material of the elastic buffer layer 06 may also include a glue material, so that the elastic buffer layer 06 has a buffering property and also has an adhesive property, and the adhesive property ensures that the elastic buffer layer 06 has a better adhesion to the glass substrate 041.
  • the elastic buffer layer 06 and the glass substrate 041 are not easily peeled off, thereby extending the service life of the foldable display module 200.
  • the elastic buffer layer 06 has an adhesive property, which can also reduce the risk of direct breakage of the glass substrate 041.
  • the thickness of the elastic buffer layer 06 is greater than or equal to 100 micrometers and less than or equal to 400 micrometers.
  • the thickness of the elastic buffer layer 06 can be 100 micrometers, 120 micrometers, 140 micrometers, 160 micrometers, 180 micrometers, 200 micrometers, 220 micrometers, 240 micrometers, 260 micrometers, 280 micrometers, 300 micrometers, 320 micrometers, 360 micrometers, 380 micrometers or 400 micrometers.
  • the buffer layer in the foldable display module is a foam layer, and the foam layer needs to be adhered to the pressure-sensitive adhesive layer before it can be fixed to the back side of the flexible display panel, resulting in the introduction of a pressure-sensitive adhesive layer in the foldable display module in the related art, which increases the risk of creases in the foldable display module.
  • the back side of the flexible substrate carrying the display main structure 04 has multiple support layers such as a back plate, a foam layer, and a metal support layer.
  • the material of the elastic buffer layer 06 includes at least one of a glue material and an elastic resin, and both the glue material and the elastic resin can be formed into a film by a coating process, without using a glue layer, thereby reducing the number of glue layers in the foldable display module 200.
  • the foldable display module 200 of the present application has only the elastic buffer layer 06 below the glass substrate 041.
  • the light-emitting side and the back side of the display main structure 04 also have no glue layer.
  • the material of the elastic buffer layer 06 includes glue material
  • the light-emitting side of the display main structure 04 has no glue layer, but the back side has a glue layer.
  • the number of adhesive layers on the light-emitting side of the display main structure 04 is less than the number of adhesive layers on the back side of the light-emitting side of the display main structure 04, so as to reduce the number of adhesive layers on the light-emitting side of the foldable display module 200, which is beneficial to improving the crease problem of the foldable display module 200 caused by plastic deformation of the adhesive layer on the light-emitting side.
  • the foldable display module 200 further includes a chip on film 091 , a flexible circuit board 092 and an adhesive layer 093 .
  • one end of the chip-on-film 091 is bound to the non-display area of the display main structure 04, so that one end of the chip-on-film 091 is connected to the display main structure 04.
  • the chip-on-film 091 is bent so that the other end of the chip-on-film 091 is located on the side of the glass substrate 041 away from the display main structure 04.
  • the chip-on-film 091 includes a flexible substrate and a driving chip located on the flexible substrate.
  • one end of the flexible circuit board 092 is connected to the other end of the COF 091, and the adhesive layer 093 adheres the other end of the flexible circuit board 092 to the elastic buffer layer 06 to fix the other end of the flexible circuit board 092 on the elastic buffer layer 06.
  • the flexible circuit board 092 includes a flexible substrate and a control chip located on the flexible substrate.
  • the back side of the light-emitting side of the foldable display module is a metal layer, a buffer layer and other film layers, and thus the flexible circuit board needs to be fixed on the metal layer and the buffer layer.
  • the flexible circuit board is fixed on the elastic buffer layer 06.
  • the adhesive layer 093 is a reinforced double-sided adhesive.
  • the adhesive layer 093 includes a flexible substrate, a first adhesive layer and a second adhesive layer, and the flexible substrate is located between the first adhesive layer and the second adhesive layer.
  • the flexible substrate provides stiffness for the adhesive layer 093, and the material of the flexible substrate includes polyethylene terephthalate, etc.
  • the elastic buffer layer 06 overlaps the chip-on-film 091 and the flexible circuit board 092 , so that the elastic buffer layer 06 also protects the chip-on-film 091 and the flexible circuit board 092 .
  • FIG. 4 is a third cross-sectional schematic diagram of a foldable display module of an embodiment of the present application.
  • the foldable display module shown in FIG. 4 is basically similar to the foldable display module shown in FIG. 3, and the similarities are not repeated.
  • the differences include: one end of the chip-on-chip film 091 is bound to the non-display area of the display main structure 04, so that one end of the chip-on-chip film 091 is connected to the display main structure 04; the chip-on-chip film 091 is bent so that the other end of the chip-on-chip film 091 is located on the side of the glass substrate 041 away from the display main structure 04; one end of the flexible circuit board 092 is connected to the other end of the chip-on-chip film 091;
  • the elastic buffer layer 06 also includes an opening 06a located in the non-foldable area 200b, the opening 06a penetrates the elastic buffer layer 06 and exposes the glass substrate 041, and the adhesive layer 093 is located in the opening 06a and bonds the other end of the flexible circuit
  • the thickness of the adhesive layer 093 is thicker to ensure the adhesion of the adhesive layer 093 and ensure that the other end of the flexible circuit board 092 can be better fixed.
  • the opening 06 a overlaps the chip-on-film 091 and the flexible circuit board 092 to reduce the bending diameter of the chip-on-film 091 and prevent the circuit on the chip-on-film 091 from being damaged due to excessive bending.
  • FIG5 is a fourth cross-sectional schematic diagram of a foldable display module of an embodiment of the present application.
  • the foldable display module 200 shown in FIG5 is substantially similar to the foldable display module 200 shown in FIG3 , and the similarities are not repeated here.
  • the differences include that the foldable display module 200 shown in FIG5 further includes a flexible substrate 07, and the flexible substrate 07 is located between the glass substrate 041 and the display main structure 04, and the flexible substrate 07 is in contact with the glass substrate 041 and the display main structure 04.
  • the flexible substrate 07 Since the flexible substrate 07 is located between the glass substrate 041 and the display main structure 04 , the flexible substrate 07 flattens the surface of the glass substrate 041 , thereby reducing the influence of impurities on the glass substrate 041 or defects of the glass substrate 041 itself on the display pixel layer 042 of the display main structure 04 .
  • the flexible substrate 07 includes a first flexible substrate 071 , which is located between the glass substrate 041 and the display pixel layer 042 of the display main structure 04 , and the first flexible substrate 071 is in direct contact with the surface of the glass substrate 041 and the display pixel layer 042 .
  • the first flexible substrate 071 is yellow.
  • the material of the first flexible substrate 071 includes but is not limited to polyimide.
  • the thickness of the first flexible substrate 071 is greater than or equal to 8 micrometers and less than or equal to 10 micrometers.
  • the thickness of the first flexible substrate 071 is 8.5 micrometers, 9 micrometers, 9.4 micrometers, 9.8 micrometers, or 10 micrometers.
  • the first flexible substrate 071 is formed by coating on the initial glass substrate having a thickness of 480 ⁇ m to 520 ⁇ m, so that the first flexible substrate 071 has good adhesion to the glass substrate 041 after the initial glass substrate has been thinned. Moreover, other structures such as the display main structure 04 are also formed on the first flexible substrate 071, and then the initial glass substrate is thinned to obtain the foldable display module 200.
  • FIG6 is a fifth cross-sectional schematic diagram of a foldable display module of an embodiment of the present application.
  • the foldable display module 200 shown in FIG6 is substantially similar to the foldable display module 200 shown in FIG5 , and the similarities are not repeated here.
  • the differences include that the flexible substrate 07 of the foldable display module 200 shown in FIG6 further includes a second flexible substrate 072, and the second flexible substrate 072 is located between the display pixel layer 042 and the first flexible substrate 071, and the second flexible substrate 072 is in direct contact with both the first flexible substrate 071 and the display pixel layer 042.
  • the material of the first flexible substrate 071 is the same as that of the second flexible substrate 072, and the thickness of the first flexible substrate 071 is greater than the thickness of the second flexible substrate 072.
  • the second flexible substrate 072 also serves to isolate the first flexible substrate 071 from the display pixel layer 042 , thereby reducing the impact of the first flexible substrate 071 on the performance of devices in the display pixel layer 042 .
  • the second flexible substrate 072 is used as a flexible substrate and is a transparent polyimide layer.
  • the thickness of the second flexible substrate 072 is greater than or equal to 4.5 micrometers and less than or equal to 7.5 micrometers.
  • the thickness of the second flexible substrate 072 is 4.5 micrometers, 5.5 micrometers, 6.5 micrometers, and 7 micrometers.
  • FIG. 7 is a first cross-sectional schematic diagram of a foldable display module according to another embodiment of the present application.
  • the foldable display module 200 shown in FIG. 7 is substantially similar to the foldable display module 200 shown in FIG. 2 .
  • the glass substrate 041 of the foldable display module 200 shown in FIG. 7 includes a groove 041 a, the groove 041 a is located in the foldable area 200 a, and the groove 041 a is arranged on the surface of the glass substrate 041 away from the display main structure 04.
  • the glass substrate 041 includes a groove 041a
  • the groove 041a is located in the foldable area 200a, and the groove 041a is arranged on the surface of the glass substrate 041 away from the display pixel layer 042, the thickness of the portion of the glass substrate 041 corresponding to the foldable area 200a is further thinned, ensuring that the portion of the glass substrate 041 corresponding to the foldable area 200a is easier to fold.
  • the thickness H1 of the portion of the glass substrate 041 corresponding to the foldable area 200a is greater than 0 microns.
  • the groove 041a penetrates the portion of the glass substrate 041 in the foldable area 200a, so that a portion of the glass substrate 041 is retained in the foldable area 200a, thereby protecting the display pixel layer 042 while providing rigid support for the display pixel layer 042.
  • the glass substrate 041 can also improve the crease problem caused by the plastic deformation of the film layer of the foldable display module 200 by taking advantage of the characteristic that the glass substrate 041 will not undergo plastic deformation.
  • the thickness of the portion of the glass substrate 041 corresponding to the foldable area 200a is greater than or equal to 10 microns, and the thickness of the portion of the glass substrate 041 corresponding to the foldable area 200a is less than 100 microns.
  • the cross-section of the groove 041 a is any one of a rectangle, a trapezoid or an inverted trapezoid. In the direction perpendicular to the thickness of the glass substrate 041 , the cross-section of the groove 041 a is a rectangle.
  • the number of the groove 041 a is one.
  • the cross-section of the groove 041 a is a rectangular shape.
  • the cross-section of the groove 041 a is a rectangular shape.
  • the sum of the depth S1 of the groove 041a and the thickness H1 of the glass substrate 041 corresponding to the foldable area 200a is equal to the thickness H2 of the glass substrate 041 corresponding to the non-foldable area 200b.
  • the depth S1 of the groove 041a is greater than the thickness H1 of the glass substrate 041 corresponding to the foldable area 200a.
  • the thickness H2 of the portion of the glass substrate 041 corresponding to the non-foldable area 200 b is greater than or equal to 10 micrometers and less than or equal to 600 micrometers, so as to ensure that the portion of the glass substrate 041 corresponding to the non-foldable area 200 b has good rigidity.
  • the thickness H2 of the portion of the glass substrate 041 corresponding to the non-foldable area 200b is greater than or equal to 300 microns and less than or equal to 600 microns.
  • the thickness H2 of the portion of the glass substrate 041 corresponding to the non-foldable area 200b is 300 microns, 320 microns, 340 microns, 360 microns, 400 microns, 420 microns, 440 microns, 460 microns, 480 microns, 500 microns, 520 microns or 600 microns.
  • an initial glass substrate with a thickness of 480 to 520 microns is used as a substrate.
  • the thin film encapsulation layer 043 and the functional module 05 are sequentially prepared on the initial glass substrate, the surface of the initial glass substrate away from the display main structure 04 is locally thinned to form a groove 041a, and a glass substrate 041 is obtained.
  • the groove 041a is formed by local thinning, and the roughness of the inner wall 041a1 of the groove 041a is greater than the roughness of the surface 041c of the glass substrate 041 close to the display main structure 04, and the roughness of the inner wall 041a1 of the groove 041a is also greater than the roughness of the surface of the glass substrate 041 located in the non-folding area and away from the display main structure 04.
  • the foldable display module 200 also includes an elastic filling layer 08, which is filled in the groove 041a.
  • the filling thickness of the elastic filling layer 08 in the groove 041a is equal to the depth S1 of the groove 041a, so as to improve the flatness of the back side of the display main structure 04 and make it more difficult for the elastic filling layer 08 to produce plastic deformation, thereby improving the crease problem caused by the plastic deformation of the film layer of the foldable display module 200.
  • the material of the elastic filling layer 08 includes at least one of a glue material and an elastic resin to ensure that the elastic filling layer 08 has good elasticity.
  • the material of the glue material includes but is not limited to any one of a liquid optical glue (Optical Clear Resin, OCR) and a solid optical glue.
  • Liquid optical glue includes but is not limited to epoxy resin, acrylate resin and polyurethane.
  • Solid optical glue includes but is not limited to polysiloxane, epoxy resin and polyurethane.
  • Elastic resin includes but is not limited to silicone and thermoplastic polyurethane.
  • the elastic filling layer 08 when the material of the elastic filling layer 08 includes a glue material, the elastic filling layer 08 is elastic and also has viscosity, and the viscosity ensures that the elastic filling layer 08 has better adhesion to the glass substrate 041.
  • the elastic filling layer 08 and the glass substrate 041 are not easily peeled off, thereby extending the service life of the foldable display module 200.
  • the elastic filling layer 08 has viscosity, which can also reduce the risk of partial fracture of the foldable area 200a corresponding to the glass substrate 041, and can also play a bonding role when cracks occur in the foldable area 200a corresponding to the glass substrate 041, thereby improving the problem of further crack propagation.
  • the material of the elastic filling layer 08 may also include elastic resin.
  • the elastic buffer layer 06 is located on a side of the glass substrate 041 away from the display pixel layer 042 , and is in direct contact with a surface of the glass substrate 041 away from the display pixel layer 042 and the elastic filling layer 08 .
  • the material of the elastic buffer layer 06 is the same as that of the elastic filling layer 08, and the elastic buffer layer 06 and the elastic filling layer 08 are integrated, so that the elastic buffer layer 06 and the elastic filling layer 08 are formed by one process, which simplifies the process of preparing the foldable display module 200 and reduces the risk of peeling between the elastic buffer layer 06 and the elastic filling layer 08.
  • the material of the elastic buffer layer 06 and the material of the elastic filling layer 08 are both elastic resin.
  • the material of the elastic buffer layer 06 may be different from the material of the elastic filling layer 08.
  • the material of the elastic filling layer 08 includes a glue material
  • the material of the elastic buffer layer 06 includes an elastic resin, so that the elastic filling layer 08 can not only fill the glass substrate 041, but also reduce the risk of partial fracture of the foldable area 200a corresponding to the glass substrate 041, and the buffering effect of the elastic buffer layer 06 can provide good protection for the glass substrate 041.
  • the material of the elastic buffer layer 06 when the material of the elastic buffer layer 06 is different from the material of the elastic filling layer 08 , the material of the elastic buffer layer 06 may also include a glue material, and the material of the elastic filling layer 08 may include an elastic resin.
  • the glass substrate 041 is in direct contact with the display pixel layer 042 , and there is no flexible substrate between the glass substrate 041 and the display pixel layer 042 , which is beneficial to improving the crease problem of the foldable display module 200 caused by the plastic deformation of the flexible substrate.
  • the foldable display module 200 shown in FIG7 may further include a first flexible substrate 071, the first flexible substrate 071 is located between the glass substrate 041 and the display pixel layer 042, and the first flexible substrate 071 is in direct contact with both the glass substrate 041 and the display pixel layer 042.
  • the relevant content of the first flexible substrate 071 can refer to FIG5 and its related description, which will not be repeated here.
  • the foldable display module 200 shown in FIG7 may further include a first flexible substrate 071 and a second flexible substrate 072, the first flexible substrate 071 is located between the glass substrate 041 and the display pixel layer 042, and the first flexible substrate 071 is in direct contact with the surface of the glass substrate 041, the second flexible substrate 072 is located between the display pixel layer 042 and the first flexible substrate 071, and the second flexible substrate 072 is in direct contact with both the first flexible substrate 071 and the display pixel layer 042.
  • the relevant content of the first flexible substrate 071 and the second flexible substrate 072 can refer to FIG6 and its related description, which will not be repeated here.
  • Figure 8 is a second cross-sectional schematic diagram of another embodiment of the foldable display module of the present application.
  • the foldable display module 200 shown in Figure 8 is basically similar to the foldable display module 200 shown in Figure 7, and the similarities are not repeated here.
  • the differences include that the groove 041a of the foldable display module 200 shown in Figure 8 penetrates the glass substrate 041 along the thickness direction of the glass substrate 041. In other words, the portion of the glass substrate 041 corresponding to the foldable area 200a is completely removed.
  • the portion of the glass substrate 041 corresponding to the foldable area 200 a is completely removed, it can be ensured that the portion of the foldable display module 200 corresponding to the foldable area 200 a has good foldability.
  • the foldable display module 200 further includes a first flexible substrate 071, which is located between the glass substrate 041 and the display pixel layer 042, and the first flexible substrate 071 is in direct contact with the glass substrate 041 and the display pixel layer 042, so that when a portion of the glass substrate 041 corresponding to the foldable area 200a is removed, the first flexible substrate 071 protects the display pixel layer 042, thereby reducing the impact of the local thinning process of the initial glass substrate on the display pixel layer 042.
  • the foldable display module 200 shown in FIG. 8 may further include the second flexible substrate 072 shown in FIG. 6 , and the second flexible substrate 072 is located between the first flexible substrate 071 and the display pixel layer 042 , and the second flexible substrate 072 is in contact with the first flexible substrate 071 and the display pixel layer 042 to further protect the display pixel layer 042 .
  • the foldable display module shown in Figures 2, 5, 6, 7 and 8 also includes the chip-on-chip film 091, flexible circuit board 092 and adhesive layer 093 in Figures 5 and 6.
  • the relevant design refers to Figures 5 and 6 and the corresponding description, which will not be repeated here.
  • Fig. 9 is a cross-sectional schematic diagram of a foldable display device according to an embodiment of the present application.
  • the foldable display device 300 includes any of the above-mentioned foldable display modules 200, a folding mechanism 30 and a sealant, and the foldable display module 200 is fixed to the folding mechanism 30 by the sealant.
  • the folding mechanism 30 includes a first support plate 301 and a second support plate 302.
  • the first support plate 301 and the second support plate 302 are rotatably connected via a hinge mechanism (not shown).
  • the sealant includes a first sealant 401 and a second sealant 402.
  • the first sealant 401 bonds the portion of the foldable display module 200 corresponding to a non-foldable area 200b to the first support plate 301
  • the second sealant 402 bonds the portion of the foldable display module 200 corresponding to another non-foldable area 200b to the second support plate 302.
  • the first sealant 401 bonds the glass substrate 041 of one non-foldable area 200b to the first support plate 301, and the first sealant 401 contacts the glass substrate 041.
  • the second sealant 402 bonds the glass substrate 041 of another non-foldable area 200b to the second support plate 302, and the second sealant 402 contacts the glass substrate 041.
  • the foldable display device 300 further includes an elastic buffer layer 06 , which overlaps with the non-foldable area 200 b , and is located between the first support plate 301 and the glass substrate 041 and between the second support plate 302 and the glass substrate 041 .
  • the elastic buffer layer 06 includes a first elastic buffer layer 061 and a second elastic buffer layer 062.
  • the first elastic buffer layer 061 is fixed on the first support plate 301
  • the first elastic buffer layer 061 is located between the first support plate 301 and the glass substrate 041 and in contact with the glass substrate 041
  • the first sealant 401 is arranged around the first elastic buffer layer 061.
  • the second elastic buffer layer 062 is fixed on the second support plate 302, the second elastic buffer layer 062 is located between the second support plate 302 and the glass substrate 041 and in contact with the glass substrate 041, and the second sealant 402 is arranged around the second elastic buffer layer 062.
  • the elastic buffer layer 06 also includes a third elastic buffer layer 603 located outside the first sealant 401 and the second sealant 402, the third elastic buffer layer 603 is located between the first support plate 301 and the glass substrate 041, and/or, the third elastic buffer layer 603 is located between the second support plate 302 and the glass substrate 041. Specifically, the third elastic buffer layer 603 is located between the first support plate 301 and the glass substrate 041 .
  • the elastic buffer layer 06 includes a substrate and an elastic buffer film on the substrate.
  • the surface of the substrate away from the elastic buffer film is sticky, and the sticky surface of the substrate is bonded to the first support plate 301 and the second support plate 302 .
  • the elastic buffer layer 06 is removed at the position where the first frame glue 401 and the second frame glue 402 are bonded to the glass substrate 041 , so as to better fix the foldable display module 200 on the folding mechanism 30 .

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Abstract

一种可折叠显示模组（200）及可折叠显示装置（300），可折叠显示模组（200）具有可折叠区（200a）和与可折叠区（200a）邻接的非可折叠区（200b），可折叠显示模组（200）包括：显示主体结构（04）以及玻璃基板（041），玻璃基板（041）位于显示主体结构（04）的出光面的背侧，玻璃基板（041）对应可折叠区（200a）的部分的厚度（H1）小于或等于100微米。

Description

可折叠显示模组及可折叠显示装置 技术领域
本申请涉及显示技术领域，尤其涉及一种可折叠显示模组及可折叠显示装置。
 背景技术
目前，可折叠显示设备已成为显示行业的主流发展方向，从小尺寸的折叠手机，到中大尺寸的折叠笔记本电脑，可折叠显示设备由于具有易收纳以及便携性高的优点，越来越受用户的喜爱。然而，可折叠显示装置在使用过程中容易产生折痕，折痕严重影响用户体验。
因此，可折叠显示装置在使用过程中容易产生折痕是亟待解决的行业痛点问题。
 发明概述
本申请的目的在于提供一种可折叠显示模组及可折叠显示装置，以改善可折叠显示模组和可折叠显示装置在使用过程中容易产生折痕的问题。
第一方面，本申请提供一种可折叠显示模组，所述可折叠显示模组具有可折叠区和与所述可折叠区邻接的非可折叠区，所述可折叠显示模组包括：
显示主体结构；以及
玻璃基板，所述玻璃基板位于所述显示主体结构的出光面的背侧，所述玻璃基板对应所述可折叠区的部分的厚度小于或等于100微米。
第二方面，本申请还提供一种可折叠显示装置，所述可折叠显示装置包括：上述可折叠显示模组。
有益效果
由于以玻璃基板作为显示主体结构的载板，玻璃基板对应可折叠区的部分的厚度小于或等于100微米，进而使玻璃基板对应可折叠区的部分薄化至其具有柔性，使得玻璃基板对应可折叠区的部分可以折叠，配合玻璃基板自身还具有刚性，将显示主体结构设置于玻璃基板上，使得玻璃基板以及显示主体结构构成一个同时具有刚性和柔性的可折叠显示面板，换言之，玻璃基板以及显示主体结构构成一个混合式（Hybrid）的可折叠显示面板。另外，由于玻璃基板提供刚性支撑，有利于省略传统技术中位于柔性显示面板的背侧的背板以及泡沫层等支撑组件，进而省略柔性显示面板背侧的胶层，改善可折叠显示模组由于胶层的塑性变形导致的折痕问题。
 附图说明
图1为相关技术中的可折叠显示模组的截面示意图；
图2为本申请的一实施例的可折叠显示模组的第一种剖面示意图；
图3为本申请的一实施例的可折叠显示模组的第二种剖面示意图；
图4为本申请的一实施例的可折叠显示模组的第三种剖面示意图；
图5为本申请的一实施例的可折叠显示模组的第四种剖面示意图；
图6为本申请的一实施例的可折叠显示模组的第五种剖面示意图；
图7为本申请的另一实施例的可折叠显示模组的第一种剖面示意图；
图8为本申请的另一实施例的可折叠显示模组的第二种剖面示意图；
图9为本申请的一实施例的可折叠显示装置的截面示意图。
 本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
请参阅图1，其为相关技术中的可折叠显示模组的截面示意图。可折叠显示模组100具有一个可折叠区100a以及两个非可折叠区100b，两个非可折叠区100b邻接于一个可折叠区100a的相对两侧。可折叠显示模组100包括柔性显示面板01、第一模块02以及第二模块03，第一模块02位于柔性显示面板01的出光侧，第二模块03位于柔性显示面板01的出光侧的背侧。
其中，柔性显示面板01包括依次叠置的柔性基板011、驱动电路层012、发光器件层013以及薄膜封装层014。其中，发光器件层013包括多个发光器件，发光器件为有机发光二极管，但不限于此，发光器件也可以为量子发光二极管。柔性基板011为聚合物基板。
第一模块02包括触控层021、偏光片022、超薄玻璃023、保护盖板024、第一粘接层0251、第二粘接层0252、第三粘接层0253以及第四粘接层0254。其中，第一粘接层0251、第二粘接层0252、第三粘接层0253以及第四粘接层0254均为透明的光学胶层（Optical Clear Adhesive，OCA）。
第一粘接层0251粘接触控层021与柔性显示面板01的薄膜封装层014。第二粘接层0252粘接触控层021与偏光片022。第三粘接层0253粘接偏光片022与超薄玻璃023。第四粘接层0254粘接超薄玻璃023与保护盖板024。其中，保护盖板024为透明的聚合物基板。
第二模块03包括背板031、泡沫层032、金属支撑层033、第五粘接层0341、第六粘接层0342以及第七粘接层0343。其中，第五粘接层0341、第六粘接层0342以及第七粘接层0343均为压敏胶层（Pressure Sensive Adhesive，PSA）。
第五粘接层0341粘接柔性显示面板01的柔性基板011与背板031。第六粘接层0342粘接背板031与泡沫层032。第七粘接层0343粘接金属支撑层033与泡沫层032。
对于相关技术中的可折叠显示模组100，可折叠显示模组100在经过多次折叠后之后容易出现折痕，影响可折叠显示模组100的外观。
发明人经过对相关技术中的可折叠显示模组100进行拆解，经过分析发现，可折叠显示模组100中存在容易发生塑性形变的膜层是导致容易产生折痕的关键因子，特别是，可折叠显示模组100中的光学胶层以及压敏胶层均容易产生塑性形变。
基于上述发现，在相关技术的基础上，本申请通过减少可折叠显示模组中的胶层的数目，甚至完全去除可折叠显示模组中的胶层，以改善可折叠显示模组由于胶层的塑性形变导致折痕的问题。
其中，本申请的具体方案包括，以玻璃基板作为显示主体结构的载板，玻璃基板对应可折叠区的部分的厚度小于或等于100微米，进而使玻璃基板对应可折叠区的部分薄化至其具有柔性，使得玻璃基板对应可折叠区的部分可以折叠，配合玻璃基板自身还具有刚性，将显示主体结构设置于玻璃基板上，使得玻璃基板以及显示主体结构构成一个同时具有刚性和柔性的可折叠显示面板，换言之，玻璃基板以及显示主体结构构成一个混合式（Hybrid）的可折叠显示面板。另外，由于玻璃基板提供刚性支撑，有利于省略传统技术中位于柔性显示面板的背侧的背板以及泡沫层等支撑组件，进而省略柔性显示面板背侧的胶层，改善可折叠显示模组由于胶层的塑性变形导致的折痕问题。
以下结合具体实施例对本申请的方案进行描述。
请参阅图2，其为本申请的一实施例的可折叠显示模组的第一种剖面示意图。
在本实施例中，可折叠显示模组200具有可折叠区200a和与可折叠区200a邻接的非可折叠区200b，两个非可折叠区200b邻接于一个可折叠区200a的相对两侧。其中，可折叠区200a与非可折叠区200b共平面时，可折叠显示模组200处于展平状态；可折叠区200a与非可折叠区200b分别位于相交的平面中时，可折叠显示模组200处于折叠状态。
可折叠区200a的数目可以为一个或者多个。具体地，可折叠区200a的数目为一个，非可折叠区200b的数目为两个。
在本实施例中，可折叠显示模组200包括依次叠置的玻璃基板041以及显示主体结构04，玻璃基板041位于显示主体结构04的出光面的背侧。
在本实施例中，玻璃基板041对应可折叠区200a的部分的厚度H1小于或等于100微米，使得玻璃基板041对应可折叠区200a的部分的厚度H1薄化至其具有柔性，以使得玻璃基板041对应可折叠区200a的部分可以折叠。
需要说明的是，玻璃基板一般是作为相关技术中硬质显示面板的刚性衬底，且玻璃基板的厚度一般为480微米至600微米，由于玻璃基板的厚度较厚，导致硬质显示面板无法折叠，且由于玻璃基板作为刚性衬底时，其厚度较厚而无法折叠，使得其目前没有应用于可折叠显示面板。
然而，本申请创新性地将厚度为480微米至600微米的初始玻璃基板作为衬底，在初始玻璃基板上形成显示主体结构04等之后，再对初始玻璃基板进行薄化处理，使初始玻璃基板对应可折叠区的部分的厚度薄化至小于或等于100微米，进而保证玻璃基板对应可折叠区的部分具有可折叠性，结合玻璃基板自身的刚性，有利于包括薄化后的玻璃基板的可折叠显示面板同时具有柔性和刚性。
另外，相关技术中的超薄玻璃023由于其厚度太薄，导致其无法直接作为显示主体结构04的载板。而且，以超薄玻璃023作为刚性载板时，其需要采用借助胶层以贴附至显示主体结构04的出光面的背侧，而胶层会增加可折叠显示模组200在折叠过程产生折痕的风险。
在本实施例中，由于显示主体结构04是直接在初始玻璃基板上成形，显示主体结构04与玻璃基板041之间没有胶层。
在本实施例中，玻璃基板041对应可折叠区200a的部分的厚度H1大于0微米，以使玻璃基板041对应可折叠区200a的部分可折叠的同时，玻璃基板041对应可折叠区200a的部分能提供刚性支撑并起到保护作用，玻璃基板041以及显示主体结构04构成一个混合式的可折叠显示面板。而且，玻璃基板041对应可折叠区200a的部分由刚性材料组成，玻璃基板041对应可折叠区200a的部分不会产生塑性形变。
进一步地，玻璃基板041对应可折叠区200a的部分的厚度H1大于或等于10微米，以保证玻璃基板041对应可折叠区200a的部分具有刚性支撑性的同时，满足玻璃基板的薄化工艺精度。
需要说明的是，玻璃基板041对应可折叠区200a的部分的厚度H1越薄，则玻璃基板041对应可折叠区200a的部分的可折叠性越好，薄化工艺难度越大。
可以理解的是，玻璃基板041对应可折叠区200a的部分的厚度H1也可以大于或等于20微米且小于或等于90微米；或者，玻璃基板041对应可折叠区200a的部分的厚度H1也可以大于或等于30微米且小于或等于80微米；或者，玻璃基板041对应可折叠区200a的部分的厚度H1也可以大于或等于40微米且小于或等于60微米；或者，玻璃基板041对应可折叠区200a的部分的厚度H1可以大于或等于12微米且小于或等于18微米。
举例而言，玻璃基板041对应可折叠区200a的部分的厚度H1可以为10微米、15微米、18微米、20微米、30微米、35微米、40微米、45微米、50微米、55微米、60微米、65微米、75微米、80微米、85微米、90微米、95微米或者100微米。
在本实施例中，玻璃基板041对应可折叠区200a的部分的厚度H1与玻璃基板041对应非可折叠区200b的部分的厚度H2相等，以保证玻璃基板041对应可折叠区200a的部分具有可折叠性的同时，保证玻璃基板041的平整性，进而保证可折叠显示模组200的平整性。
具体地，玻璃基板041对应非可折叠区200b的部分的厚度H2大于或等于10微米且小于或等于100微米。
举例而言，玻璃基板041对应非可折叠区200b的部分的厚度H2为10微米、15微米、18微米、20微米、30微米、35微米、40微米、45微米、50微米、55微米、60微米、65微米、75微米、80微米、85微米、90微米、95微米或者100微米。
需要说明的是，本申请以厚度为480微米至520微米的初始玻璃基板作为衬底，在初始玻璃基板上制备显示主体结构04等结构之后，对初始玻璃基板背离显示主体结构04的表面进行整体薄化，以得到厚度为10微米至100微米的玻璃基板041，并使玻璃基板041对应可折叠区200a的部分的厚度H1与玻璃基板041对应非可折叠区200b的部分的厚度H2相等。其中，对玻璃基板进行薄化的方法包括但不限于机械研磨以及化学蚀刻等。
在本实施例中，由于玻璃基板041远离显示主体结构04的表面041b是经过薄化处理得到，玻璃基板041远离显示主体结构04的表面041b比较粗糙；而玻璃基板041靠近显示主体结构04的表面041c没有经过处理，玻璃基板041靠近显示主体结构04的表面041c比较光滑。因此，在玻璃基板041的厚度方向上，玻璃基板041远离显示主体结构04的表面041b的粗糙度大于玻璃基板041靠近显示主体结构04的表面041c的粗糙度。
在本实施例中，显示主体结构04包括显示像素层042以及薄膜封装层043。
在本实施例中，显示像素层042位于玻璃基板041的一侧。具体地，显示像素层042位于玻璃基板041的表面上，换言之，显示像素层042与玻璃基板041的表面直接接触。
在本实施例中，由于显示像素层042与玻璃基板041的表面直接接触，玻璃基板041与显示像素层042之间没有柔性基板，以改善可折叠显示模组200由于柔性基板的塑性变形导致的折痕问题。其中，柔性基板的材料包括不限于聚酰亚胺。另外，玻璃基板041能起到支撑作用，也可以省略柔性基板。
需要说明的是，在本申请中，两个膜层之间直接接触，是指两者膜层之间没有其他膜层，例如，两个膜层之间没有胶层。
其中，显示像素层042包括驱动电路层0421以及发光器件层0422，发光器件层0422位于驱动电路层0421远离玻璃基板041的表面上。驱动电路层0421包括多个驱动电路，发光器件层0422包括多个发光器件，发光器件与驱动电路电连接。其中，发光器件为有机发光二极管，但不限于此，发光器件也可以为量子点发光二极管等。
在本实施例中，薄膜封装层043用于对显示像素层042进行封装，以延长显示主体结构04的使用寿命。薄膜封装层043位于显示像素层042远离玻璃基板041的一侧，且薄膜封装层043包覆显示像素层042。
其中，薄膜封装层043包括两个无机层以及位于两个无机层之间的有机层。无机层的材料包括但不限于氮化硅、氧化硅以及三氧化二铝中的至少一种。有机层的材料包括但不限于聚酰亚胺以及聚丙烯酸酯中的至少一种。
在本实施例中，由于玻璃基板041在可折叠区200a以及非可折叠区200b均能起到刚性支撑的作用，本实施例的可折叠显示模组200不包括相关技术中起到支撑作用的背板、泡沫层以及金属层等支撑本体，以减少位于显示主体结构04的出光面的背侧的胶层的数目，甚至完全去除位于显示主体结构04的出光面的背侧的胶层，进而改善由于可折叠显示模组200由于胶层的塑性形变导致的折痕问题。
在本实施例中，可折叠显示模组200还包括功能模块05，功能模块05位于显示主体结构04远离玻璃基板041的表面上，且包括至少两个堆叠的功能层051，任意相邻两个功能层051之间接触。
具体地，功能模块05位于薄膜封装层043远离显示像素层042的表面上。功能模块05包括至少两个功能层051，任意相邻两个功能层051之间直接接触。
本实施例通过功能模块05位于薄膜封装层043远离显示像素层042的表面上，使得功能模块05与薄膜封装层043之间直接接触，去除功能模块05与薄膜封装层043之间的胶层，进而改善可折叠显示模组200由于胶层的塑性形变导致的折痕问题。而且，功能模块05中任意两个膜层之间直接接触，使得功能模块05的任意两个膜层之间的胶层也被去除，减少功能模块05中的胶层，进一步地改善可折叠显示模组200由于胶层的塑性形变导致的折痕问题。
需要说明的是，在相关技术中，柔性显示面板01的出光侧有四个胶层。然而，本申请通过功能模块05位于薄膜封装层043远离显示像素层042的表面上，且功能模块05包括至少两个功能层051，任意相邻两个功能层051之间直接接触，将相关技术中柔性显示面板01的出光侧的四个胶层均去除。
其中，功能层051包括但不限于触控层、光学功能层以及透光保护层中的至少一种。其中，光学功能层包括但不限于彩色滤光层以及光学透镜层。透光保护层包括硬质涂层等。
在本实施例中，功能模块05包括触控层052、彩色滤光层053以及硬质涂层054。触控层052位于显示主体结构04远离玻璃基板041的表面上。彩色滤光层053位于触控层052远离显示主体结构04的表面上。硬质涂层054位于彩色滤光层053远离触控层052的表面上。
具体地，触控层052位于薄膜封装层043远离显示像素层042的表面上。彩色滤光层053位于触控层052远离薄膜封装层043的表面上。硬质涂层054位于彩色滤光层053远离触控层052的表面上。
在本实施例中，触控层052包括触控电极和与触控电极连接的触控电极线。触控电极包括互容式触控电极或者自容式触控电极中的一种。触控层052是在薄膜封装层043上直接制备得到，故触控层052直接附着于显示主体结构04上。
彩色滤光层053包括黑色矩阵层以及多个光阻单元，黑色矩阵层包括多个开口，多个光阻单元一对一地设置于多个开口中。彩色滤光层053是直接在触控层052形成，故彩色滤光层053直接附着于触控层052上。
需要说明的是，本实施例采用彩色滤光层053替代传统技术中的偏光片，彩色滤光层053可以直接形成于触控层052上，而不需要胶层，有利于减少功能模块05中的胶层。
硬质涂层054对其下方的功能膜层起到保护作用。硬质涂层054的材料包括固化后的光学胶层，以保证硬质涂层054可以通过涂布和固化工艺直接形成于彩色滤光层053远离触控层052的表面上。其中，固化后的光学胶层的材料包括但不限于丙烯酸酯类树脂、环氧树脂以及聚氨酯中的至少一种。
可以理解的是，硬质涂层054也可以包括无机层，无机层的材料包括但不限于氮化硅、氧化硅以及三氧化二铝中的至少一种。
需要说明的是，本申请以硬质涂层054替代传统的超薄玻璃和保护盖板，以使硬质涂层054对其下方的功能层起到保护作用。而且，超薄玻璃和保护盖板等需要胶层实现贴附，由于硬质涂层054可以通过涂布等方式而不需要胶层就可以形成于其他膜层上，有利于减少功能模块05中的胶层。此外，一些相关技术中硬质涂层形成在柔性基材上以作为保护盖板，但是柔性基材在折叠过程中容易产生折痕，本申请硬质涂层054直接形成在彩色滤光层053上，可以省略柔性基材，更加有利于改善可折叠显示模组200在折叠过程中容易产生折痕的问题。
还需要说明的是，本申请发明人还创新性地发现，由于玻璃基板作为显示主体结构04的刚性支撑衬底，玻璃基板具有刚性而不容易在外力作用下发生内部形变，硬质涂层054的材料包括固化后的光学胶层时，通过固化以得到硬质涂层054时，固化过程中会产生的应力对其下的膜层的影响较小。而在一些相关技术中，仅仅以聚酰亚胺层作为衬底时，由于聚酰亚胺层在外力作用下更容易形变，导致在聚酰亚胺层上形成包括固化后的光学胶层的硬质涂层054时，固化过程中的产生的应力会对其下方的一些膜层的性能造成影响。
在其他实施例中，功能模块05也可以只包括触控层052、彩色滤光层053以及硬质涂层054的一者或者两者。也可以将触控层052以及彩色滤光层053中的至少一者集成于显示主体结构04中。
在本实施例中，由于显示主体结构04的出光侧和出光侧的背侧均没有胶层，即可折叠显示模组中没有光学胶层以及压敏胶层，进而改善可折叠显示模组由于胶层贴合导致的气泡不良、凹凸点以及贴合印痕等问题，实现可折叠显示模组200在折叠过程中是轻折痕甚至无折痕，改善可折叠显示模组200的外观，进而改善用户体验。
可以理解的是，在其他实施例中，也可以仅仅显示主体结构04中的出光侧没有光学胶层，或者，显示主体结构04的出光侧的背侧没有压敏胶层，以改善可折叠显示模组由于胶层贴合导致的气泡不良、凹凸点以及贴合印痕等问题。
请参阅图3，其为本申请的一实施例的可折叠显示模组的第二种剖面示意图。图3所示可折叠显示模组200与图2所示可折叠显示模组200基本相似，相同之处不再赘述，不同之处包括，图3所示可折叠显示模组200还包括弹性缓冲层06，弹性缓冲层06位于玻璃基板041远离显示像素层042的一侧，且弹性缓冲层06与玻璃基板041远离显示像素层042的表面直接接触，以使弹性缓冲层06与玻璃基板041之间没有胶层，弹性缓冲层06的弹性性能对玻璃基板041起到保护作用的同时，改善胶层导致可折叠显示模组200容易产生折痕的问题。
在本实施例中，弹性缓冲层06位于可折叠区200a和非可折叠区200b。
在本实施例中，弹性缓冲层06与可折叠显示模组200的显示区重叠，以对可折叠显示模组200的显示区起到保护作用。
可以理解的是，还可以弹性缓冲层06与可折叠显示模组200的非显示区重叠。其中，弹性缓冲层06的材料包括胶材以及弹性树脂中的至少一种。胶材的材料包括但不限于液态光学胶（Optical Clear Resin,OCR）以及固态光学胶中的至少一种。液态光学胶包括但不限于环氧树脂、丙烯酸酯树脂以及聚氨酯等。固态光学胶包括但不限于聚硅氧烷、环氧树脂以及聚氨酯等。弹性树脂包括弹性树脂，弹性树脂包括但不限于硅胶以及热塑性聚氨酯等。
在本实施例，具体地，弹性缓冲层06的材料为弹性树脂，以保证弹性缓冲层06具有良好的缓冲性能。而且，弹性树脂制备的弹性缓冲层06，弹性缓冲层06具有良好的回弹性，弹性缓冲层06比光学胶层以及压敏胶层更难产生塑性形变，也有利于改善可折叠显示模组由于胶层的塑性形变导致的折痕问题。
在其他实施例中，弹性缓冲层06的材料也可以包括胶材，以使得弹性缓冲层06具有缓冲性的同时，弹性缓冲层06还具有粘接性，粘接性保证弹性缓冲层06与玻璃基板041之间具有更好的附着力，在可折叠显示模组200折叠过程中，弹性缓冲层06与玻璃基板041之间不容易发生剥离，进而延长可折叠显示模组200的使用寿命。另外，弹性缓冲层06具有粘接性，也可以降低玻璃基板041直接断裂的风险。
其中，弹性缓冲层06的厚度大于或等于100微米且小于或等于400微米。举例而言，弹性缓冲层06的厚度可以为100微米、120微米、140微米、160微米、180微米、200微米、220微米、240微米、260微米、280微米、300微米、320微米、360微米、380微米或者400微米。
需要说明的是，不同于相关技术中可折叠显示模组中缓冲层为泡沫层，泡沫层是需要经过压敏胶层贴合，才能固定于至柔性显示面板的背侧，导致相关技术中的可折叠显示模组中会引入压敏胶层，压敏胶层会增加可折叠显示模组产生折痕的风险。另外，不同于相关技术中，承载显示主体结构04的柔性基材的背面有背板、泡沫层以及金属支撑层等多个支撑层。
而在本实施例中，弹性缓冲层06的材料包括胶材以及弹性树脂中的至少一种，胶材和弹性树脂均可以通过涂布等工艺成膜，而不需要采用胶层，进而减少可折叠显示模组200中的胶层的数目。而且，本申请的可折叠显示模组200在玻璃基板041的下方只有弹性缓冲层06。
在本实施例中，当弹性缓冲层06的材料包括弹性树脂时，显示主体结构04的出光侧和背侧也均没有胶层。而当弹性缓冲层06的材料包括胶材时，显示主体结构04的出光侧没有胶层，而背侧有一个胶层。
在其他实施例中，在可折叠显示模组200中，显示主体结构04的出光侧的胶层的数目少于显示主体结构04的出光侧的背侧的胶层的数目，以减少可折叠显示模组200的出光侧的胶层的数目，有利于改善可折叠显示模组200由于出光侧的胶层的塑性形变导致的折痕问题。
在本实施例中，可折叠显示模组200还包括覆晶薄膜091、柔性电路板092以及粘接层093。
在本实施例中，覆晶薄膜091的一端绑定于显示主体结构04的非显示区，以使得覆晶薄膜091的一端与显示主体结构04连接。覆晶薄膜091弯折使覆晶薄膜091的另一端位于玻璃基板041远离显示主体结构04的一侧。覆晶薄膜091包括柔性基材和位于柔性基材上的驱动芯片。
在本实施例中，柔性电路板092的一端与覆晶薄膜091的另一端连接，粘接层093粘接柔性电路板092的另一端与弹性缓冲层06，以将柔性电路板092的另一端固定于弹性缓冲层06上。柔性电路板092包括柔性基材和位于柔性基材上的控制芯片。
需要说明的是，不同于相关技术中，可折叠显示模组的出光侧的背侧是金属层以及缓冲层等膜层，进而需要将柔性电路板固定于金属层以及缓冲层上，本申请将柔性电路板固定于弹性缓冲层06上。
在本实施例中，粘接层093为补强双面胶。粘接层093包括柔性基材、第一胶层以及第二胶层，柔性基材位于第一胶层以及第二胶层之间。柔性基材为粘接层093提供挺性，柔性基材的材料包括聚对苯二甲酸乙二醇酯等。
在本实施例中，弹性缓冲层06与覆晶薄膜091以及柔性电路板092均重叠，以使得弹性缓冲层06也对覆晶薄膜091以及柔性电路板092起到保护作用。
请参阅图4，其为本申请的一实施例的可折叠显示模组的第三种剖面示意图。图4所示可折叠显示模组与图3所示可折叠显示模组基本相似，相同之处不再赘述，不同之处包括：覆晶薄膜091的一端绑定于显示主体结构04的非显示区，以使得覆晶薄膜091的一端与显示主体结构04连接；覆晶薄膜091弯折使覆晶薄膜091的另一端位于玻璃基板041远离显示主体结构04的一侧；柔性电路板092的一端与覆晶薄膜091的另一端连接；弹性缓冲层06还包括位于非可折叠区200b的开口06a，开口06a贯穿弹性缓冲层06并暴露玻璃基板041，粘接层093位于开口06a中并粘接柔性电路板092的另一端与玻璃基板041，以将柔性电路板092的另一端固定于玻璃基板041上。
由于粘接层093位于弹性缓冲层06的开口06a中并粘接柔性电路板092的另一端与玻璃基板041，使得粘接层093的厚度更厚，以保证粘接层093的粘着力，保证柔性电路板092的另一端能更好地被固定。
在本实施例中，开口06a与覆晶薄膜091以及柔性电路板092重叠，以减小覆晶薄膜091的弯曲直径，避免覆晶薄膜091上的线路弯折过度而受损。
请参阅图5，其为本申请的一实施例的可折叠显示模组的第四种剖面示意图。图5所示可折叠显示模组200与图3所示可折叠显示模组200基本相似，相同之处不再赘述，不同之处包括，图5所示可折叠显示模组200还包括柔性基板07，柔性基板07位于玻璃基板041与显示主体结构04之间，且柔性基板07与玻璃基板041以及显示主体结构04接触。
由于柔性基板07位于玻璃基板041与显示主体结构04之间，柔性基板07对玻璃基板041的表面起到平坦化作用，降低玻璃基板041上的杂质或者玻璃基板041自身的缺陷对显示主体结构04的显示像素层042的影响。
具体地，柔性基板07包括第一柔性基板071，第一柔性基板071位于玻璃基板041与显示主体结构04的显示像素层042之间，且第一柔性基板071与玻璃基板041的表面以及显示像素层042均直接接触。
其中，第一柔性基板071是黄色的。第一柔性基板071的材料包括但不限于聚酰亚胺。第一柔性基板071的厚度大于或等于8微米且小于或等于10微米。
举例而言，第一柔性基板071的厚度为8.5微米、9微米、9.4微米、9.8微米或者10微米。
需要说明的是，第一柔性基板071是通过在前述厚度为480微米至520微米的初始玻璃基板上通过涂布等工艺形成，使得第一柔性基板071与初始玻璃基板经过薄化处理之后的玻璃基板041之间具有良好的附着力。而且，显示主体结构04等其他结构也是在第一柔性基板071上形成之后，再对初始玻璃基板进行薄化处理，以得到可折叠显示模组200。
请参阅图6，其为本申请的一实施例的可折叠显示模组的第五种剖面示意图。图6所示可折叠显示模组200与图5所示可折叠显示模组200基本相似，相同之处不再赘述，不同之处包括，图6所示可折叠显示模组200的柔性基板07还包括第二柔性基板072，第二柔性基板072位于显示像素层042与第一柔性基板071之间，且第二柔性基板072与第一柔性基板071和显示像素层042均直接接触。其中，第一柔性基板071的材料与第二柔性基板072的材料相同，且第一柔性基板071的厚度大于第二柔性基板072的厚度。
需要说明的是，第二柔性基板072还起到隔离第一柔性基板071与显示像素层042的作用，降低第一柔性基板071对显示像素层042中的器件的性能的影响。
其中，第二柔性基板072作为柔性衬底使用。第二柔性基板072是透明的聚酰亚胺层。
第二柔性基板072的厚度大于或等于4.5微米且小于或等于7.5微米。举例而言，第二柔性基板072的厚度为4.5微米、5.5微米、6.5微米以及7微米。
请参阅图7，其为本申请的另一实施例的可折叠显示模组的第一种剖面示意图。图7所示可折叠显示模组200与图2所示可折叠显示模组200基本相似，
相同之处不再赘述，不同之处包括：图7所示可折叠显示模组200的玻璃基板041包括凹槽041a，凹槽041a位于可折叠区200a，凹槽041a设置于玻璃基板041远离显示主体结构04的表面上。
由于玻璃基板041包括凹槽041a，凹槽041a位于可折叠区200a，凹槽041a设置于玻璃基板041远离显示像素层042的表面上，进一步地薄化玻璃基板041对应可折叠区200a的部分的厚度，保证玻璃基板041对应可折叠区200a的部分更容易折叠。
在本实施例中，在凹槽041a位于可折叠区200a的情况下，玻璃基板041对应可折叠区200a的部分的厚度H1大于0微米，换言之，凹槽041a在可折叠区200a贯穿玻璃基板041的部分，以使玻璃基板041在可折叠区200a保留部分，以对显示像素层042起到保护作用的同时，对显示像素层042起到刚性支撑的作用，还能借助玻璃基板041不会发生塑性形变的特性，以改善可折叠显示模组200由于膜层的塑性形变产生的折痕问题。
具体地，在凹槽041a位于可折叠区200a的情况下，玻璃基板041对应可折叠区200a的部分的厚度大于或等于10微米，且玻璃基板041对应可折叠区200a的部分的厚度小于100微米。
其中，在玻璃基板041的厚度方向上，凹槽041a的截面的形状为矩形、梯形或者倒梯形中的任意一种。在垂直于玻璃基板041的厚度的方向上，凹槽041a的截面的形状为矩形。
具体地，凹槽041a的数目为一个。在玻璃基板041的厚度方向上，凹槽041a的截面的形状为矩形。在垂直于玻璃基板041的厚度的方向上，凹槽041a的截面的形状为矩形。
凹槽041a的深度S1与玻璃基板041对应可折叠区200a的部分的厚度H1的加和等于玻璃基板041对应非可折叠区200b的部分的厚度H2。凹槽041a的深度S1大于玻璃基板041对应可折叠区200a的部分的厚度H1。
在本实施例中，玻璃基板041对应非可折叠区200b的部分的厚度H2大于或等于10微米且小于或等于600微米，以保证玻璃基板041对应非可折叠区200b的部分具有良好的刚性。
具体地，玻璃基板041对应非可折叠区200b的部分的厚度H2大于或等于300微米且小于或等于600微米。举例而言，玻璃基板041对应非可折叠区200b的部分的厚度H2为300微米、320微米、340微米、360微米、400微米、420微米、440微米、460微米、480微米、500微米、520微米或者600微米。
需要说明的是，本实施例以厚度为480微米至520微米的初始玻璃基板作为衬底，在初始玻璃基板上依次制备显示像素层042薄膜封装层043以及功能模块05等之后，对初始玻璃基板背离显示主体结构04的表面进行局部薄化，以形成凹槽041a，并得到玻璃基板041。
在本实施例中，凹槽041a是通过局部薄化形成，凹槽041a的内壁041a1的粗糙度大于玻璃基板041靠近显示主体结构04的表面041c的粗糙度，凹槽041a的内壁041a1的粗糙度也大于玻璃基板041位于非折叠区且远离显示主体结构04的表面的粗糙度。
在本实施例中，可折叠显示模组200还包括弹性填充层08，弹性填充层08填充于凹槽041a中，弹性填充层08在凹槽041a中的填充厚度等于凹槽041a的深度S1，以提高显示主体结构04的背面的平整性，且使得弹性填充层08更难产生塑性形变，改善可折叠显示模组200由于膜层的塑性形变产生的折痕问题。
弹性填充层08的材料包括胶材以及弹性树脂中的至少一种，以保证弹性填充层08具有良好的弹性。其中，胶材的材料包括但不限于液态光学胶（Optical Clear Resin，OCR）以及固态光学胶中的任意一种。液态光学胶包括但不限于环氧树脂、丙烯酸酯树脂以及聚氨酯等。固态光学胶包括但不限于聚硅氧烷、环氧树脂以及聚氨酯等。弹性树脂包括但不限于硅胶以及热塑性聚氨酯等。
在本实施例中，弹性填充层08的材料包括胶材时，以使得弹性填充层08具有弹性的同时，弹性填充层08还具有粘性，粘性保证弹性填充层08与玻璃基板041之间具有更好的附着力，在折叠过程中，弹性填充层08与玻璃基板041之间不容易发生剥离，进而延长可折叠显示模组200的使用寿命。另外，弹性填充层08具有粘性，也可以降低玻璃基板041对应的可折叠区200a的部分断裂的风险，也可以对在玻璃基板041对应的可折叠区200a的部分产生裂纹时起到粘接的作用，改善裂纹进一步地扩散的问题。
在其他实施例中，弹性填充层08的材料也可以包括弹性树脂。
在本实施例中，弹性缓冲层06位于玻璃基板041远离显示像素层042的一侧，且与玻璃基板041远离显示像素层042的表面以及弹性填充层08直接接触。
在本实施例中，弹性缓冲层06的材料与弹性填充层08的材料相同，且弹性缓冲层06与弹性填充层08是一体的，以通过一道工艺形成弹性缓冲层06和弹性填充层08，简化制备可折叠显示模组200的工艺，且降低弹性缓冲层06与弹性填充层08之间剥离的风险。具体地，弹性缓冲层06的材料与弹性填充层08的材料均为弹性树脂。
在其他实施例中，弹性缓冲层06的材料与弹性填充层08的材料也可以不同。举例而言，弹性填充层08的材料包括胶材，弹性缓冲层06的材料包括弹性树脂，以使得弹性填充层08起到填充作用的同时，弹性填充层08起到降低玻璃基板041对应的可折叠区200a的部分断裂的风险，而弹性缓冲层06的缓冲作用对玻璃基板041起到良好的保护作用。
可以理解的是，在其他实施例中，弹性缓冲层06的材料与弹性填充层08的材料不同时，弹性缓冲层06的材料也可以包括胶材，弹性填充层08的材料包括弹性树脂。
在本实施例中，玻璃基板041与显示像素层042之间直接接触，玻璃基板041与显示像素层042之间没有柔性基板，有利于改善可折叠显示模组200由于柔性基板的塑性形变导致的折痕问题。
在本实施例中，图7所示可折叠显示模组200还可以包括第一柔性基板071，第一柔性基板071位于玻璃基板041与显示像素层042之间，且第一柔性基板071与玻璃基板041以及显示像素层042均直接接触，第一柔性基板071的相关内容可以参考图5及其相关描述，此处不再赘述。或者，图7所示可折叠显示模组200还可以包括第一柔性基板071和第二柔性基板072，第一柔性基板071位于玻璃基板041与显示像素层042之间，且第一柔性基板071与玻璃基板041的表面直接接触，第二柔性基板072位于显示像素层042与第一柔性基板071之间，且第二柔性基板072与第一柔性基板071和显示像素层042均直接接触，第一柔性基板071和第二柔性基板072的相关内容可以参考对图6及其相关描述，此处不再赘述。
请参阅图8，其为本申请的另一实施例的可折叠显示模组的第二种剖面示意图。图8所示可折叠显示模组200与图7所示可折叠显示模组200基本相似，相同之处不再赘述，不同之处包括，图8所示可折叠显示模组200的凹槽041a沿玻璃基板041的厚度方向贯穿玻璃基板041，换言之，玻璃基板041对应可折叠区200a的部分完全去除。
由于玻璃基板041对应可折叠区200a的部分完全去除，可以保证可折叠显示模组200对应可折叠区200a的部分具有良好的可折叠性。
在本实施例中，可折叠显示模组200还包括第一柔性基板071，第一柔性基板071位于玻璃基板041与显示像素层042之间，且第一柔性基板071与玻璃基板041以及显示像素层042均直接接触，以使得在去除玻璃基板041对应可折叠区200a的部分时，第一柔性基板071对显示像素层042起到保护作用，降低对上述初始玻璃基板进行局部薄化过程对显示像素层042的影响。
在本实施例中，图8所示可折叠显示模组200还可以包括图6中所示的第二柔性基板072，第二柔性基板072位于第一柔性基板071与显示像素层042之间，且第二柔性基板072与第一柔性基板071与显示像素层042均接触，以进一步地对显示像素层042起到保护作用。
需要说明的是，对于图2、图5、图6、图7以及图8所示可折叠显示模组，其也包括图5和图6中的覆晶薄膜091、柔性电路板092以及粘接层093，相关设计参照对图5和图6及对应的描述，此处不再赘述。
还需要说明的是，上述实施例中可以兼容的技术特征之间可以任意相互组合。
请参阅图9，图9为本申请的一实施例的可折叠显示装置的截面示意图。可折叠显示装置300包括上述任意一种可折叠显示模组200、折叠机构30以及框胶，可折叠显示模组200通过框胶固定于折叠机构30上。
折叠机构30包括第一支撑板301以及第二支撑板302。第一支撑板301以及第二支撑板302通过铰链机构（未示意出）转动连接。
框胶包括第一框胶401以及第二框胶402。第一框胶401粘接可折叠显示模组200对应一个非可折叠区200b的部分与第一支撑板301，第二框胶402粘接可折叠显示模组200对应另一个非可折叠区200b的部分与第二支撑板302。
具体地，第一框胶401粘接一个非可折叠区200b的玻璃基板041与第一支撑板301，第一框胶401与玻璃基板041接触。第二框胶402粘接另一个非可折叠区200b的玻璃基板041与第二支撑板302，第二框胶402与玻璃基板041接触。
在本实施例中，可折叠显示装置300还包括弹性缓冲层06，弹性缓冲层06与非可折叠区200b重叠，且弹性缓冲层06位于第一支撑板301与玻璃基板041之间以及第二支撑板302与玻璃基板041之间。
具体地，弹性缓冲层06包括第一弹性缓冲层061以及第二弹性缓冲层062。第一弹性缓冲层061固定于第一支撑板301上，第一弹性缓冲层061位于第一支撑板301与玻璃基板041之间且与玻璃基板041接触，且第一框胶401围绕第一弹性缓冲层061设置。第二弹性缓冲层062固定于第二支撑板302上，第二弹性缓冲层062位于第二支撑板302与玻璃基板041之间且与玻璃基板041接触，第二框胶402围绕第二弹性缓冲层062设置。在本实施例中，弹性缓冲层06还包括位于第一框胶401和第二框胶402之外的第三弹性缓冲层603，第三弹性缓冲层603位于第一支撑板301与玻璃基板041之间，和/或，第三弹性缓冲层603位于第二支撑板302与玻璃基板041之间。具体地，第三弹性缓冲层603位于第一支撑板301与玻璃基板041之间。
其中，弹性缓冲层06包括基材和位于基材上的弹性缓冲膜，基材远离弹性缓冲膜的表面具有粘性，基材具有粘性的表面与第一支撑板301以及第二支撑板302粘接。
需要说明的是，在第一框胶401和第二框胶402与玻璃基板041粘接的位置，弹性缓冲层06会去除，以更好地将可折叠显示模组200固定于折叠机构30上。
以上实施例的说明只是用于帮助理解本申请的技术方案及其核心思想；本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例的技术方案的范围。

Claims (20)

  1. 一种可折叠显示模组，其中，所述可折叠显示模组具有可折叠区和与所述可折叠区邻接的非可折叠区，所述可折叠显示模组包括：
    显示主体结构；以及
    玻璃基板，所述玻璃基板位于所述显示主体结构的出光面的背侧，所述玻璃基板对应所述可折叠区的部分的厚度小于或等于100微米。
  2. 根据权利要求1所述的可折叠显示模组，其中，所述可折叠显示模组还包括：
    弹性缓冲层，位于所述玻璃基板远离所述显示主体结构的一侧，且与所述玻璃基板远离所述显示主体结构的表面接触。
  3. 根据权利要求2所述的可折叠显示模组，其中，所述玻璃基板包括：
    凹槽，位于所述可折叠区，并设置于所述玻璃基板远离所述显示主体结构的表面上。
  4. 根据权利要求3所述的可折叠显示模组，其中，所述凹槽的内壁的粗糙度大于所述玻璃基板靠近显示主体结构的表面的粗糙度；
    所述玻璃基板对应所述非可折叠区的部分的厚度大于或等于300微米且小于或等于600微米；
    所述可折叠显示模组还包括：
    弹性填充层，填充于所述凹槽中。
  5. 根据权利要求4所述的可折叠显示模组，其中，所述弹性填充层的材料与所述弹性缓冲层的材料相同。
  6. 根据权利要求5所述的可折叠显示模组，其中，所述弹性缓冲层的材料包括弹性树脂，所述弹性填充层的材料包括胶材以及弹性树脂中的至少一种。
  7. 根据权利要求1所述的可折叠显示模组，其中，所述显示主体结构与所述玻璃基板之间没有胶层。
  8. 根据权利要求1所述的可折叠显示模组，其中，所述玻璃基板对应所述可折叠区的部分的厚度与所述玻璃基板对应所述非可折叠区的部分的厚度相等。
  9. 根据权利要求1所述的可折叠显示模组，其中，在所述玻璃基板的厚度方向上，所述玻璃基板远离所述显示主体结构的表面的粗糙度大于所述玻璃基板靠近所述显示主体结构的表面的粗糙度。
  10. 根据权利要求1所述的可折叠显示模组，其中，所述玻璃基板对应所述可折叠区的部分的厚度大于10微米。
  11. 根据权利要求1所述的可折叠显示模组，其中，所述可折叠显示模组还包括：
    柔性基板，位于所述玻璃基板与所述显示主体结构之间，且与所述玻璃基板以及所述显示主体结构接触。
  12. 根据权利要求1所述的可折叠显示模组，其中，所述玻璃基板与所述显示主体结构接触。
  13. 根据权利要求1所述的可折叠显示模组，其中，所述显示主体结构包括：
    显示像素层，位于所述玻璃基板的一侧；以及
    薄膜封装层，位于所述显示像素层远离所述玻璃基板的一侧，且包覆所述显示像素层。
  14. 根据权利要求1所述的可折叠显示模组，其中，所述可折叠显示模组还包括：
    功能模块，位于所述显示主体结构远离所述玻璃基板的表面上，且包括至少两个堆叠的功能层，任意相邻两个所述功能层之间接触。
  15. 根据权利要求14所述的可折叠显示模组，其中，所述功能模块包括：
    触控层，位于所述显示主体结构远离所述玻璃基板的表面上；
    彩色滤光层，位于触控层远离所述显示主体结构的表面上；以及
    硬质涂层，位于所述彩色滤光层远离所述触控层的表面上。
  16. 根据权利要求2所述的可折叠显示模组，其中，所述可折叠显示模组还包括：
    覆晶薄膜，所述覆晶薄膜的一端与所述显示主体结构连接，所述覆晶薄膜弯折使所述覆晶薄膜的另一端位于所述玻璃基板远离所述显示主体结构的一侧；
    柔性电路板，所述柔性电路板的一端与所述覆晶薄膜的另一端连接；以及
    粘接层，粘接所述柔性电路板的另一端与所述弹性缓冲层。
  17. 根据权利要求2所述的可折叠显示模组，其中，所述弹性缓冲层还包括位于所述非可折叠区的开口，所述开口贯穿所述弹性缓冲层并暴露所述玻璃基板；
    所述可折叠显示模组还包括：
    覆晶薄膜，所述覆晶薄膜的一端与所述显示主体结构连接，所述覆晶薄膜弯折使所述覆晶薄膜的另一端位于所述玻璃基板远离所述显示主体结构的一侧；
    柔性电路板，所述柔性电路板的一端与所述覆晶薄膜的另一端连接；以及
    粘接层，位于所述开口中，并粘接所述柔性电路板的另一端与所述玻璃基板。
  18. 一种可折叠显示装置，其中，所述可折叠显示装置包括：
    如权利要求1所述可折叠显示模组。
  19. 根据权利要求18所述的可折叠显示装置，其中，两个所述非可折叠区邻接于一个所述可折叠区的相对两侧，所述可折叠显示装置还包括：
    第一支撑板；以及
    第二支撑板，与所述第一支撑板转动连接；
    第一框胶，粘接一个所述非可折叠区的所述玻璃基板与所述第一支撑板；以及
    第二框胶，粘接另一个所述非可折叠区的所述玻璃基板与所述第二支撑板。
  20. 根据权利要求19所述的可折叠显示装置，其中，所述可折叠显示装置还包括：
    弹性缓冲层，与所述非可折叠区重叠，且位于所述第一支撑板与所述玻璃基板之间以及所述第二支撑板与所述玻璃基板之间。
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