WO2022183757A1 - 盖板和显示装置 - Google Patents

盖板和显示装置 Download PDF

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Publication number
WO2022183757A1
WO2022183757A1 PCT/CN2021/128419 CN2021128419W WO2022183757A1 WO 2022183757 A1 WO2022183757 A1 WO 2022183757A1 CN 2021128419 W CN2021128419 W CN 2021128419W WO 2022183757 A1 WO2022183757 A1 WO 2022183757A1
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WO
WIPO (PCT)
Prior art keywords
layer
cover plate
buffer layer
substrate
present disclosure
Prior art date
Application number
PCT/CN2021/128419
Other languages
English (en)
French (fr)
Inventor
刘少奎
王志会
沈丹平
曾伟
汤强
Original Assignee
京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 成都京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US17/908,644 priority Critical patent/US20240196554A1/en
Publication of WO2022183757A1 publication Critical patent/WO2022183757A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/03—Covers
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2274/00—Thermoplastic elastomer material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/584—Scratch resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/737—Dimensions, e.g. volume or area
    • B32B2307/7375—Linear, e.g. length, distance or width
    • B32B2307/7376—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Definitions

  • the present disclosure relates to the field of displays, and in particular, to a cover plate and a display device.
  • the folding display device includes a flexible display panel (Panel, PNL) and a cover (Cover Window), and the cover is located on the flexible display panel to protect the flexible display panel.
  • the cover plate includes a substrate and buffer layers located on opposite sides of the substrate, and the substrate and the buffer layer have good flexibility, which facilitates the folding of the foldable display device.
  • the ultra-thin glass and buffer layer have low strength and are easily damaged when the cover is squeezed or impacted.
  • Embodiments of the present disclosure provide a cover plate and a display device, which increase the strength of the cover plate and reduce the possibility of damage to the cover plate.
  • the technical solution is as follows:
  • the present disclosure provides a cover plate for a flexible display panel, the cover plate comprising: a substrate having opposing first and second surfaces, the first surface facing the flexible a display panel; a first buffer layer, laminated on the first surface, the elastic modulus of the first buffer layer is between 10 megapascals to 2 gigapascals; a second buffer layer, laminated on the second surface, The elastic modulus of the second buffer layer is between 60 megapascals and 7 gigapascals.
  • the first buffer layer is any one of a flexible polyurethane layer, a polyimide layer, and a polymethyl methacrylate layer, or the first buffer layer It is formed by laminating at least two layers of a flexible polyurethane layer, a polyimide layer and a polymethyl methacrylate layer;
  • the second buffer layer is a flexible polyurethane layer, a polyimide layer and a polymethyl methacrylate layer. Any one of the layers, or, the second buffer layer is formed by laminating at least two of the flexible polyurethane layer, the polyimide layer and the polymethyl methacrylate layer.
  • the thickness of the first buffer layer is between 5 ⁇ m and 40 ⁇ m; the thickness of the second buffer layer is between 5 ⁇ m and 40 ⁇ m. Between 5 microns and 40 microns.
  • the cover plate further includes: a first elastic layer stacked on a side of the first buffer layer away from the substrate.
  • the first elastic layer is a thermoplastic polyurethane layer.
  • the cover plate further includes: a first support layer stacked on a side of the first elastic layer away from the substrate.
  • the first support layer is a polyester resin layer.
  • the cover plate further includes: a protective layer stacked on a side of the first buffer layer away from the substrate, and the protective layer is located on the second buffer layer The layer is the outermost layer among all the layers on the side away from the substrate; the first adhesive layer is bonded between the protective layer and the layer adjacent to the protective layer.
  • the protective layer includes: a second support layer, laminated on a side of the first adhesive layer away from the substrate; a scratch-resistant layer, laminated on the second A side of the support layer away from the substrate.
  • the viscosity of the first adhesive layer when the temperature is between 15 degrees Celsius and 35 degrees Celsius, the viscosity of the first adhesive layer is greater than 700 gf/inch, and the creep coefficient of the first adhesive layer is greater than % Three hundredth, the coefficient of restitution of the first adhesive layer is greater than 80 percent; when the temperature is less than minus 50 degrees Celsius, the viscosity of the first adhesive layer is less than 30 gf/inch.
  • the present disclosure provides a display device, the display device includes a cover plate and a flexible display panel stacked in sequence, and the cover plate is the cover plate according to any one of the above-mentioned aspects.
  • the display device further includes: a second elastic layer stacked on a side of the flexible display panel away from the cover plate; the tensile strength of the second elastic layer is between 5 MPa and 10 MPa.
  • the second elastic layer is any one of a thermoplastic polyurethane elastomer rubber layer, a foam layer, a polyester resin layer, a polyimide, and an optical adhesive layer, or,
  • the second elastic layer is formed by laminating at least two layers of thermoplastic polyurethane elastomer rubber layer, foam layer, polyester resin layer, polyimide, and optical adhesive layer.
  • the length of the cover plate is greater than the length of the display panel, and the first direction and the extension of the bending line when the display device is bent
  • the direction is vertical, and the first direction is parallel to the first surface.
  • a first buffer layer is arranged on the first surface of the substrate, and a second buffer layer is arranged on the second surface of the substrate.
  • both the first buffer layer and the second buffer layer can deform to absorb stress, realize the protection of the substrate, increase the strength of the cover plate, and reduce the possibility of damage to the cover plate.
  • the elastic modulus of the first buffer layer is between 10 megapascals and 2 gigapascals, that is, the elasticity of the first buffer layer is good, because the first surface faces the flexible display panel, that is, the first buffer layer with better elasticity faces the flexible display panel.
  • the flexible display panel can increase the protection effect of the first buffer layer on the flexible display panel.
  • the elastic modulus of the second buffer layer is between 60 MPa and 7 gigapascals, that is, the rigidity of the second buffer layer is better, so that the strength of the second buffer layer is higher, and when the cover plate is impacted, the strain is reduced.
  • the amount delivered to the substrate further reduces the possibility of damage to the cover.
  • FIG. 1 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure
  • FIG. 2 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure
  • FIG. 3 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure.
  • FIG. 4 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure.
  • FIG. 5 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure.
  • FIG. 6 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure.
  • FIG. 7 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure.
  • FIG. 8 is a manufacturing flow chart of a cover plate provided by an embodiment of the present disclosure.
  • FIG. 9 is a schematic cross-sectional view of a display device provided by an embodiment of the present disclosure.
  • FIG. 10 is a schematic cross-sectional view of a display device provided by an embodiment of the present disclosure.
  • FIG. 1 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure.
  • the cover plate 100 includes a substrate 10 , a first buffer layer 20 and a second buffer layer 30 .
  • the substrate 10 has opposing first surfaces 101 and second surfaces 102 .
  • the first buffer layer 20 is laminated on the first surface 101 of the substrate 10
  • the second buffer layer 30 is laminated on the second surface 102 of the substrate 10 .
  • the first surface 101 faces the flexible display panel 200
  • the elastic modulus of the first buffer layer 20 is between 10 megapascals (MPa) and 2 gigapascals (GPa)
  • the elastic modulus of the second buffer layer 30 is 60 megapascals (GPa). Pascals to 7 gigapascals.
  • the elastic modulus is the ratio of the stress to the strain of the material under stress. The larger the elastic modulus of the material, the stronger the ability of the material to resist elastic deformation, that is, the stronger the rigidity of the material and the weaker the elasticity; the smaller the elastic modulus of the material, the weaker the ability of the material to resist elastic deformation , that is, the weaker the rigidity and the stronger the elasticity of the material.
  • the first buffer layer 20 is arranged on the first surface 101 of the substrate 10, and the second buffer layer 30 is arranged on the second surface 102 of the substrate 10.
  • the Both the first buffer layer 20 and the second buffer layer 30 can deform to absorb stress, so as to protect the substrate 10 , increase the strength of the cover plate 100 , and reduce the possibility of damage to the cover plate 100 .
  • the elastic modulus of the first buffer layer 20 is between 10 megapascals and 2 gigapascals, that is, the elasticity of the first buffer layer 20 is good.
  • the buffer layer 20 faces the flexible display panel, which can increase the protection effect of the first buffer layer 20 on the flexible display panel.
  • the elastic modulus of the second buffer layer 30 is between 60 megapascals and 7 gigapascals, that is, the rigidity of the second buffer layer 30 is relatively good, so that the strength of the second buffer layer 30 is relatively large, when the cover plate 100 is impacted , reducing the amount of strain transmitted to the substrate 10 , further reducing the possibility of damage to the cover plate 100 .
  • a pen drop test or a ball drop test is performed on the cover plate 100, that is, a pen or a ball with a certain weight is dropped at a certain height of the cover plate 100, and the pen or ball makes a free fall motion to hit the cover plate 100, Then, the performance of the cover plate 100 after being hit is detected to determine whether the cover plate 100 is qualified.
  • Both surfaces of the cover plate 100 provided by the embodiments of the present disclosure are provided with buffer layers, which can reduce the possibility of damage to the cover plate 100 and improve the pass rate of the cover plate 100 when the cover plate 100 is subjected to a pen drop test or a ball drop test. .
  • the weight of the pen or the ball is between 10 grams (g) and 15 grams, and the height of the pen drop test or the ball drop test is between 20 centimeters (cm) and 30 cm, so as to ensure the reliability of the pen drop test or the ball drop test. sex.
  • the weight of the pen or ball is 13 grams, and the height of the pen or ball drop test is 25 centimeters.
  • the substrate 10 is an ultra-thin glass (Ultra Thin Glass, UTG), and the ultra-thin glass can be bent, rolled or folded to facilitate the folding of the flexible display panel.
  • UTG Ultra Thin Glass
  • the thickness of the ultra-thin glass is much thinner than that of the ordinary glass, which can reduce the thickness of the cover plate 100 and facilitate the miniaturization of the device.
  • ultra-thin glass refers to glass with a thickness between 30 micrometers ( ⁇ m) and 40 micrometers.
  • the elastic modulus of the first buffer layer 20 is set between 10 megapascals to 2 gigapascals, which can ensure the first buffering When the layer 20 is impacted, it can generate a large deformation to absorb the stress, so as to protect the substrate 10 and also protect the flexible display panel.
  • the elastic modulus of the first buffer layer 20 is 50 megapascals.
  • the first buffer layer 20 is a flexible polyurethane (Polyurethane, PU) layer, a polyimide (Polyimides, PI) layer, and a polymethyl methacrylate (Polymethyl Methacrylate, PMMA) layer. any of the layers.
  • the flexible polyurethane, polyimide and polymethyl methacrylate are all polymer coatings with good elasticity, which can ensure the elastic modulus of the first buffer layer 20 .
  • the first buffer layer 20 is formed by laminating at least two layers of a flexible polyurethane layer, a polyimide layer and a polymethyl methacrylate layer.
  • the first buffer layer 20 is formed by laminating a flexible polyurethane layer and a polyimide layer.
  • the thickness of the first buffer layer 20 is between 5 ⁇ m and 40 ⁇ m. It can not only ensure the elasticity of the first buffer layer 20 but also avoid that the thickness of the first buffer layer 20 is too thick to increase the thickness of the cover plate 100 .
  • the thickness of the first buffer layer 20 is 20 microns.
  • the second buffer layer 30 is located on the second surface 102 of the substrate 10 , that is, the second buffer layer 30 is located on the side of the substrate 10 away from the flexible display panel.
  • the cover plate 100 When the cover plate 100 is impacted, it is generally the substrate The side facing the second surface 102 is hit first, and the elastic modulus of the second buffer layer 30 is set between 60 MPa and 7 gigapascals, which can ensure the strength of the second buffer layer 30 and reduce the strain to the substrate. 10, further reducing the possibility of damage to the cover plate 100.
  • the elastic modulus of the second buffer layer 30 is 3 gigapascals.
  • the second buffer layer 30 is any one of a flexible polyurethane layer, a polyimide layer, and a polymethyl methacrylate layer.
  • Flexible polyurethane, polyimide and polymethyl methacrylate not only have elasticity, but also have certain rigidity, which can ensure the strength of the second buffer layer 30 .
  • the second buffer layer 30 is formed by laminating at least two layers of a flexible polyurethane layer, a polyimide layer and a polymethyl methacrylate layer.
  • the second buffer layer 30 is formed by laminating a flexible polyurethane layer and a polyimide layer.
  • the thickness of the second buffer layer 30 is between 5 ⁇ m and 40 ⁇ m. It can not only ensure the strength of the second buffer layer 30 but also avoid that the thickness of the first buffer layer 20 is too thick to increase the thickness of the cover plate 100 .
  • the thickness of the second buffer layer 30 is 30 microns.
  • FIG. 2 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure.
  • the cover plate 100 further includes a first elastic layer 40 , and the first elastic layer 40 is laminated on a side of the second buffer layer 30 away from the substrate 10 .
  • the first elastic layer 40 is disposed on the side of the second buffer layer 30 away from the substrate 10 , that is, the first elastic layer 40 is located on the side facing the second surface 102 of the substrate 10 .
  • the cover plate 100 When the cover plate 100 is impacted, generally the side of the substrate 10 facing the second surface 102 is impacted first, that is, the first elastic layer 40 is impacted first, and the first elastic layer 40 deforms to absorb stress after being impacted.
  • the buffer layer 30 protects and reduces the deformation of the second buffer layer 30 , so the second buffer layer 30 transmits less deformation to the substrate 10 and reduces the deformation of the substrate 10 , that is, the strength of the cover plate 100 can be increased, reducing the The possibility of damage to the cover 100.
  • the elasticity of the first elastic layer 40 is relatively large, which protects the second buffer layer 30 to avoid damage to the second buffer layer 30 in the pen drop test or the ball drop test, thereby increasing the protection effect on the ultra-thin glass.
  • the first elastic layer 40 is a thermoplastic polyurethane (Thermoplastic Urethane, TPU) layer.
  • the elasticity of the thermoplastic polyurethane is good, which ensures the elasticity of the first elastic layer 40 .
  • the thickness of the first elastic layer 40 is between 25 ⁇ m and 100 ⁇ m. It can not only ensure the strength of the first elastic layer 40 but also avoid that the thickness of the first elastic layer 40 is too thick to increase the thickness of the cover plate 100 .
  • the thickness of the first elastic layer 40 is 75 microns.
  • the cover plate 100 further includes a first support layer 50 , and the first support layer 50 is laminated on a side of the first elastic layer 40 away from the substrate 10 .
  • the first support layer 50 is arranged on the side of the first elastic layer 40 away from the substrate 10 , that is, the first support layer 50 is located outside the first elastic layer 40 .
  • the first support layer 50 is impacted first, and the rigidity of the first support layer 50 is strong, so that the strain transmitted by the first support layer 50 to the first elastic layer 40 is small, that is, the first elasticity
  • the deformation of the layer 40 is small, thereby reducing the strain transmitted to the substrate 10, reducing the possibility of damage to the substrate 10, that is, reducing the possibility of damage to the cover plate 100.
  • the stronger rigidity of the first support layer 50 can increase the support of the cover plate 100 and ensure the shape of the cover plate 100 .
  • the first support layer 50 is a polyester resin (Polyethylene Terephthalate, PET) layer.
  • the rigidity of the polyester resin is relatively strong, which ensures the rigidity of the first support layer 50 .
  • the thickness of the first support layer 50 is between 50 ⁇ m and 80 ⁇ m. It can not only ensure the strength of the first support layer 50 but also avoid that the thickness of the first support layer 50 is too thick to increase the thickness of the cover plate 100 . Illustratively, the thickness of the first support layer 50 is 50 microns.
  • the cover plate 100 further includes a protective layer 60 and a first adhesive layer 70 .
  • the protective layer 60 is stacked on a side of the second buffer layer 30 away from the substrate 10 , and the protective layer 60 is the outermost layer among all the layers on the side of the second buffer layer 30 away from the substrate 10 .
  • the first adhesive layer 70 is located between the protective layer 60 and a layer adjacent to the protective layer 60 .
  • the protective layer 60 is arranged on the outermost side of the second buffer layer 30 away from the substrate 10 , that is, the protective layer 60 is located on the outermost side of the cover plate 100 .
  • the protective layer 60 is bumped first, and the hardness of the protective layer 60 is relatively high, so as to avoid the formation of scratches on the surface of the cover plate 100 .
  • the strong rigidity of the protective layer 60 can increase the support of the cover plate 100 and ensure the shape of the cover plate 100 .
  • the first adhesive layer 70 is used for bonding the protective layer 60 and the second buffer layer 30 to ensure the integrity of the cover plate 100 .
  • the thickness of the protective layer 60 is between 50 ⁇ m and 80 ⁇ m. This can not only ensure the strength of the protective layer 60 , but also avoid that the thickness of the protective layer 60 is too thick to increase the thickness of the cover plate 100 .
  • the thickness of the protective layer 60 is 65 microns.
  • the thickness of the first adhesive layer 70 in a direction perpendicular to the first surface 101 , is between 10 ⁇ m and 30 ⁇ m.
  • the thickness of the first adhesive layer 70 is controlled to prevent the thickness of the first adhesive layer 70 from being too thick to increase the thickness of the cover plate 100 .
  • the thickness of the first adhesive layer 70 is 15 microns.
  • the first adhesive layer 70 is an optical adhesive (Optically Clear Adhesive, OCA for short) layer.
  • OCA Optically Clear Adhesive
  • the first adhesive layer 70 is a pressure-sensitive adhesive (Pressure Sensitive Adhesive, PSA) layer.
  • PSA Pressure Sensitive Adhesive
  • the viscosity of the first adhesive layer 70 is greater than 700 gf/inch.
  • the viscosity of the first adhesive layer 70 is greater than 700 gf/inch, so as to ensure the viscosity of the first adhesive layer 70 at room temperature, the protective layer 60 and the The second buffer layer 30 is bonded.
  • 700gf/inch means a weight of 700 grams per inch. If the viscosity of the first adhesive layer 70 is greater than 700 gf/inch, the protective layer 60 and the second buffer layer 30 can be disassembled only when the weight per inch of the first adhesive layer 70 is greater than 700 grams.
  • the creep coefficient of the first adhesive layer 70 is greater than three hundred percent (300%) when the temperature is between 15 degrees Celsius and 35 degrees Celsius. That is, the first adhesive layer 70 is easily deformed, which facilitates the bending of the cover plate 100 .
  • the coefficient of restitution of the first adhesive layer 70 is greater than eighty percent (80%). The original shape can be restored after the first adhesive layer 70 is bent.
  • the viscosity of the first adhesive layer 70 is less than 30 gf/inch.
  • the cover plate 100 when the protective layer 60 is damaged and the protective layer 60 and the second buffer layer 30 need to be disassembled, the cover plate 100 is placed in an environment with a temperature of less than minus 50 degrees Celsius for disassembly.
  • the viscosity of the first adhesive layer 70 is less than 30 gf/inch, the viscosity is relatively weak, which is convenient for disassembling the protective layer 60 and the second buffer layer 30 .
  • the cover plate 100 includes a first buffer layer 20 , a substrate 10 , a second buffer layer 30 , a first elastic layer 40 , a first support layer 50 , and a first adhesive layer 70 stacked in sequence. and protective layer 60.
  • the first adhesive layer 70 is used to bond the protective layer 60 and the first support layer 50 .
  • FIG. 5 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure.
  • the cover plate 100 includes a first buffer layer 20 , a substrate 10 , a second buffer layer 30 , a first elastic layer 40 , a first adhesive layer 70 and a protective layer 60 that are stacked in sequence.
  • the first adhesive layer 70 is used to bond the protective layer 60 and the first elastic layer 40 together.
  • FIG. 6 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure.
  • the cover plate 100 includes a first buffer layer 20 , a substrate 10 , a second buffer layer 30 , a first adhesive layer 70 and a protective layer 60 that are stacked in sequence.
  • the first adhesive layer 70 is used for bonding the protective layer 60 and the second buffer layer 30 .
  • FIG. 7 is a schematic cross-sectional view of a cover plate provided by an embodiment of the present disclosure.
  • the cover plate 100 includes a first buffer layer 20 , a substrate 10 , a second buffer layer 30 , a first support layer 50 , a first adhesive layer 70 and a protective layer 60 that are stacked in sequence.
  • the first adhesive layer 70 is used to bond the protective layer 60 and the first support layer 50 .
  • the protective layer 60 includes a second support layer 601 and a scratch-resistant layer 602 .
  • the second support layer 601 is laminated on the side of the first adhesive layer 70 away from the substrate 10 .
  • the anti-scratch layer 602 is laminated on a side of the second support layer 601 away from the substrate 10 .
  • the protective layer 60 is configured as a second support layer 601 and a scratch-resistant layer 602 , the second support layer 601 has strong rigidity, increases the supportability of the cover plate 100 , and ensures the shape of the cover plate 100 .
  • the anti-scratch layer 602 has high hardness to avoid scratches on the surface of the cover plate 100 .
  • the protective layer 60 can also have better scratch resistance, higher pencil hardness, higher water drop angle and other properties.
  • the second support layer 601 is a polyester resin layer.
  • the rigidity of the polyester resin is strong, which ensures the rigidity of the second support layer 601 .
  • the thickness of the second support layer 601 in a direction perpendicular to the first surface 101 , is between 45 ⁇ m and 75 ⁇ m. It can not only ensure the strength of the second support layer 601 but also avoid that the thickness of the second support layer 601 is too thick to increase the thickness of the cover plate 100 .
  • the thickness of the second support layer 601 is 60 microns.
  • the anti-scratch layer 602 may be referred to as a hard coating (HC) layer.
  • HC hard coating
  • the thickness of the anti-scratch layer 602 is between 3 ⁇ m and 10 ⁇ m. It can not only ensure the hardness of the anti-scratch layer 602 , but also prevent the thickness of the anti-scratch layer 602 from being too thick to increase the thickness of the protective layer 60 .
  • the scratch resistant layer 602 has a thickness of 5 microns.
  • FIG. 8 is a flow chart of manufacturing a cover plate provided by an embodiment of the present disclosure. Referring to Figure 8, the method includes:
  • step 201 a substrate is provided.
  • the substrate is ultra-thin glass.
  • a first buffer layer is formed on the first surface of the substrate.
  • a second buffer layer is formed on the second surface of the substrate.
  • the first buffer layer and the second buffer layer are both polymer material layers and have adhesive properties, and the first buffer layer and the second buffer layer can be directly pasted on the first surface and the second surface of the substrate, respectively .
  • the method further includes:
  • a first elastic layer is formed on a side of the second buffer layer away from the substrate.
  • both the second buffer layer and the first elastic layer have adhesive properties, and the first elastic layer is pasted on the side of the second buffer layer away from the substrate.
  • a first support layer is formed on a side of the first elastic layer away from the second buffer layer.
  • the first support layer is adhered on the side of the first elastic layer away from the second buffer layer.
  • a protective layer is formed on a side of the first support layer away from the first elastic layer.
  • a liquid adhesive is applied on the side of the first support layer away from the first elastic layer, and then the protective layer is attached to the adhesive, and the first adhesive is formed after the adhesive is cured. layer, and the first support layer and the protective layer are pasted together to form a cover plate.
  • FIG. 9 is a schematic cross-sectional view of a display device provided by an embodiment of the present disclosure.
  • the display device includes a cover plate 100 and a flexible display panel 200 that are stacked in sequence, and the cover plate 100 is the cover plate 100 shown in any of the drawings in FIGS. 1 to 7 .
  • the first buffer layer 20 is arranged on the first surface 101 of the substrate 10, and the second buffer layer 30 is arranged on the second surface 102 of the substrate 10.
  • the Both the first buffer layer 20 and the second buffer layer 30 can deform to absorb stress, so as to protect the substrate 10 , increase the strength of the cover plate 100 , and reduce the possibility of damage to the cover plate 100 .
  • the elastic modulus of the first buffer layer 20 is between 10 megapascals and 2 gigapascals, that is, the elasticity of the first buffer layer 20 is good, because the first surface 101 faces the flexible display panel, that is, the The buffer layer 20 faces the flexible display panel, which can increase the protection effect of the first buffer layer 20 on the flexible display panel.
  • the elastic modulus of the second buffer layer 30 is between 60 megapascals and 7 gigapascals, that is, the rigidity of the second buffer layer 30 is relatively good, so that the strength of the second buffer layer 30 is relatively large, when the cover plate 100 is impacted , reducing the amount of strain transmitted to the substrate 10 , further reducing the possibility of damage to the cover plate 100 .
  • the flexible display panel 200 may be an organic light-emitting diode (Organic Light-Emitting Diode, OELD) display panel.
  • OELD Organic Light-Emitting Diode
  • FIG. 10 is a schematic cross-sectional view of a display device provided by an embodiment of the present disclosure.
  • the display device further includes a second elastic layer 300 , and the second elastic layer 300 is laminated on a side of the flexible display panel 200 away from the cover plate 100 .
  • the second elastic layer 300 is arranged on a side of the flexible display panel 200 away from the cover plate 100 , that is, the second elastic layer 300 and the cover plate 100 are located on opposite sides of the flexible display panel 200 .
  • the second elastic layer 300 and the cover plate 100 respectively protect the flexible display panel 200 from both sides of the flexible display panel 200 .
  • Both the second elastic layer 300 and the cover plate 100 have elasticity. When the display device is hit, both the second elastic layer 300 and the cover plate 100 can deform to protect the flexible display panel 200 and reduce the possibility of damage to the display device. Reduces the possibility of damage to the display device when performing a pen drop or ball drop test on the display device.
  • the second elastic layer 300 can also play a role of shielding light.
  • the display device when the display device is a bendable display device, during the bending process, the elasticity of the second elastic layer 300 is good, and can also play a role in absorbing the dislocation momentum of the film layer, reducing the The possibility of the flexible display panel 200 falling off or breaking.
  • the tensile strength of the second elastic layer 300 is between 5 megapascals and 10 megapascals.
  • the tensile strength of the second elastic layer 300 is set between 5 MPa and 10 MPa to ensure the elasticity of the second elastic layer 300 .
  • the tensile strength of the second elastic layer 300 is 8 megapascals.
  • the second elastic layer 300 is any one of a thermoplastic polyurethane elastomer rubber layer, a foam layer, a polyester resin layer, a polyimide, and an optical adhesive layer.
  • thermoplastic polyurethane elastomer rubber, foam, polyester resin, polyimide, and optical adhesive all have elasticity to ensure the elasticity of the second elastic layer 300 .
  • the second elastic layer 300 is formed by laminating at least two layers of a thermoplastic polyurethane elastomer rubber layer, a foam layer, a polyester resin layer, a polyimide layer, and an optical adhesive layer. to make.
  • the second elastic layer 300 is formed by laminating a thermoplastic polyurethane elastomer rubber layer, a foam layer and a polyester resin layer.
  • the thickness of the second elastic layer 300 in a direction perpendicular to the first surface 101 , is between 5 ⁇ m and 30 ⁇ m. It can not only ensure the strength of the second elastic layer 300, but also prevent the thickness of the second elastic layer 300 from being too thick to increase the thickness of the display device. Exemplarily, the thickness of the second elastic layer 300 is 20 microns.
  • the length L1 of the cover plate 100 is greater than the length L2 of the flexible display panel 200
  • the first direction a is perpendicular to the extension direction of the bending line when the display device is bent
  • the first direction a is the same as the length L2 of the flexible display panel 200.
  • the first surfaces 101 are parallel.
  • the length L1 of the cover plate 100 is longer than the length L2 of the flexible display panel 200 .
  • the side of the flexible display panel 200 can be protected to avoid bumping on the side of the flexible display panel 200 . cause damage.
  • the second elastic layer 300 and the flexible display panel 200 are integrally cut, so the length of the second elastic layer 300 is equal to the length of the flexible display panel 200 .
  • the display panel 200 is bonded.
  • the thickness of the second adhesive layer 400 is between 25 ⁇ m and 100 ⁇ m. Avoiding that the thickness of the second adhesive layer 400 is too thick increases the thickness of the display device. Exemplarily, the thickness of the second adhesive layer 400 is 50 microns.
  • the second adhesive layer 400 is an optical adhesive layer.
  • the adhesiveness of the optical adhesive is good, which ensures the firmness of the connection between the cover plate 100 and the flexible display panel 200 .
  • the second adhesive layer 400 is a pressure-sensitive adhesive layer.
  • the display device further includes a support plate 500, and the support plate 500 supports the second elastic layer 300 and the flexible display panel 200 to ensure the shape of the display device.
  • the elastic modulus of the support plate 500 is greater than 700 MPa, and the tensile strength of the support plate 500 is greater than 1000 MPa, so as to ensure the strength and support performance of the support plate 500 .
  • the bending area of the support plate 500 may be subjected to a patterning process, so that the bending area of the support plate 500 forms a hollow, and during the bending process The stress can be relieved to facilitate the bending of the support plate 500 and make the support plate 500 have a smaller bending radius.
  • the support plate 500 may be a stainless steel plate, an aluminum alloy plate, or a titanium alloy plate.
  • the thickness of the support plate 500 in a direction perpendicular to the first surface 101 , is between 20 ⁇ m and 200 ⁇ m.
  • the strength and supportability of the support plate 500 can be ensured, and the thickness of the support plate 500 can be prevented from being too thick to increase the thickness of the display device.
  • the thickness of the support plate 500 is 100 microns.
  • the display device further includes a polarizer (Polarizer, pol) 600 , and the polarizer 600 is located between the flexible display panel 200 and the cover plate 100 .
  • polarizer Polarizer, pol
  • the thickness of the polarizer 600 is between 40 micrometers and 100 micrometers.
  • the thickness of the polarizer 600 is 50 microns.
  • the display device further includes a back film (BF) 700 , and the back film 700 is located between the flexible display panel 200 and the support plate 500 .
  • BF back film
  • the thickness of the back film 700 is between 5 microns and 100 microns.
  • the thickness of the back film 700 is 50 microns.

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Abstract

本公开是关于一种盖板和显示装置，属于显示器领域。盖板包括基板、第一缓冲层和第二缓冲层。基板具有第一表面和第二表面，第一表面朝向柔性显示面板，第一缓冲层层叠在第一表面，第一缓冲层的弹性模量在10兆帕斯卡至2吉帕斯卡之间。第二缓冲层层叠在第二表面，第二缓冲层的弹性模量在60兆帕斯卡至7吉帕斯卡之间。在盖板受到撞击时，第一缓冲层和第二缓冲层均可以发生形变来吸收应力，实现对基板的保护，增加盖板的强度，减小盖板损坏的可能性。增加第一缓冲层对柔性显示面板的保护效果。同时第二缓冲层的刚性大于第一缓冲层的刚性，使得第二缓冲层的强度较大，在盖板受到撞击时，减小应变向基板传递的量，进一步减小盖板损坏的可能性。

Description

盖板和显示装置
本公开要求于2021年3月5日提交的申请号为202110245878.1、发明名称为“盖板和显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及显示器领域，特别涉及一种盖板和显示装置。
背景技术
折叠显示装置在显示领域的应用越来越多，用户可以根据实际需求调节折叠显示装置的屏幕尺寸。折叠显示装置包括柔性显示面板(Panel，PNL)和盖板(Cover Window)，盖板位于柔性显示面板上，以对柔性显示面板进行保护。
相关技术中，盖板包括基板和位于基板相对两侧的缓冲层，基板和缓冲层的柔性较好，便于折叠显示装置的折叠。但是超薄玻璃和缓冲层的强度较低，在盖板受到挤压或冲击时容易损坏。
发明内容
本公开实施例提供了一种盖板和显示装置，增加盖板的强度，减小盖板损坏的可能性。所述技术方案如下：
一方面，本公开提供了一种盖板，所述盖板用于柔性显示面板，所述盖板包括：基板，具有相对的第一表面和第二表面，所述第一表面朝向所述柔性显示面板；第一缓冲层，层叠在所述第一表面，所述第一缓冲层的弹性模量在10兆帕斯卡至2吉帕斯卡之间；第二缓冲层，层叠在所述第二表面，所述第二缓冲层的弹性模量在60兆帕斯卡至7吉帕斯卡之间。
在本公开实施例的一种实现方式中，所述第一缓冲层为柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的任一层，或者，所述第一缓冲层由柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的至少两层层叠而成；所述第二缓冲层为柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的任一层，或者， 所述第二缓冲层由柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的至少两层层叠而成。
在本公开实施例的一种实现方式中，在垂直于所述第一表面的方向上，所述第一缓冲层的厚度在5微米至40微米之间；所述第二缓冲层的厚度在5微米至40微米之间。
在本公开实施例的一种实现方式中，所述盖板还包括：第一弹性层，层叠在所述第一缓冲层远离所述基板的一侧面。
在本公开实施例的一种实现方式中，所述第一弹性层为热塑性聚氨酯层。
在本公开实施例的一种实现方式中，所述盖板还包括：第一支撑层，层叠在所述第一弹性层远离所述基板的一侧面。
在本公开实施例的一种实现方式中，所述第一支撑层为涤纶树脂层。
在本公开实施例的一种实现方式中，所述盖板还包括：保护层，层叠在所述第一缓冲层远离所述基板的一侧面，且所述保护层为位于所述第二缓冲层远离所述基板的一侧面所有层中最外侧的层；第一粘接层，粘接在所述保护层和与所述保护层相邻的层之间。
在本公开实施例的一种实现方式中，所述保护层包括：第二支撑层，层叠在所述第一粘接层远离所述基板的一侧面；防刮层，层叠在所述第二支撑层远离所述基板的一侧面。
在本公开实施例的一种实现方式中，在温度在15摄氏度至35摄氏度时，所述第一粘接层的粘性大于700gf/inch，所述第一粘接层的蠕变系数大于百分之三百，所述第一粘接层的恢复系数大于百分之八十；在温度小于负50摄氏度时，所述第一粘接层的粘性小于30gf/inch。
另一方面，本公开提供了一种显示装置，所述显示装置包括依次层叠的盖板和柔性显示面板，所述盖板为上述任一方面所述的盖板。
在本公开实施例的一种实现方式中，所述显示装置还包括：第二弹性层，层叠在所述柔性显示面板远离所述盖板的一侧面；所述第二弹性层的拉伸强度在5兆帕至10兆帕之间。
在本公开实施例的一种实现方式中，所述第二弹性层为热塑性聚氨酯弹性体橡胶层、泡棉层、涤纶树脂层、聚酰亚胺、光学胶层中的任一层，或者，所述第二弹性层由热塑性聚氨酯弹性体橡胶层、泡棉层、涤纶树脂层、聚酰亚胺、 光学胶层中的至少两层层叠而成。
在本公开实施例的一种实现方式中，在第一方向上，所述盖板的长度大于所述显示面板的长度，所述第一方向与所述显示装置弯折时的弯折线的延伸方向垂直，且所述第一方向与所述第一表面平行。
本公开实施例提供的技术方案带来的有益效果是：
在基板的第一表面布置第一缓冲层，在基板的第二表面布置第二缓冲层，在盖板的两个表面受到撞击时，第一缓冲层和第二缓冲层均可以发生形变来吸收应力，实现对基板的保护，增加盖板的强度，减小盖板损坏的可能性。第一缓冲层的弹性模量在10兆帕斯卡至2吉帕斯卡之间，也即第一缓冲层的弹性较好，由于第一表面朝向柔性显示面板，也即弹性较好的第一缓冲层朝向柔性显示面板，可以增加第一缓冲层对柔性显示面板的保护效果。第二缓冲层的弹性模量在60兆帕斯卡至7吉帕斯卡之间，也即第二缓冲层的刚性较好，使得第二缓冲层的强度较大，在盖板受到撞击时，减小应变向基板传递的量，进一步减小盖板损坏的可能性。
附图说明
为了更清楚地说明本公开实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本公开实施例提供的一种盖板的截面示意图；
图2是本公开实施例提供的一种盖板的截面示意图；
图3是本公开实施例提供的一种盖板的截面示意图；
图4是本公开实施例提供的一种盖板的截面示意图；
图5是本公开实施例提供的一种盖板的截面示意图；
图6是本公开实施例提供的一种盖板的截面示意图；
图7是本公开实施例提供的一种盖板的截面示意图；
图8是本公开实施例提供的一种盖板的制作流程图；
图9是本公开实施例提供的一种显示装置的截面示意图；
图10是本公开实施例提供的一种显示装置的截面示意图。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本公开实施方式作进一步地详细描述。
图1是本公开实施例提供的一种盖板的截面示意图。参见图1，盖板100包括：基板10、第一缓冲层20和第二缓冲层30。基板10具有相对的第一表面101和第二表面102。第一缓冲层20层叠在基板10的第一表面101，第二缓冲层30层叠在基板10的第二表面102。其中，第一表面101朝向柔性显示面板200，第一缓冲层20的弹性模量在10兆帕斯卡(MPa)至2吉帕斯卡(GPa)之间，第二缓冲层30的弹性模量在60兆帕斯卡至7吉帕斯卡之间。
需要说明的是，弹性模量为材料在受力状态下的应力与应变之比。材料的弹性模量越大，说明该材料抵抗弹性变形的能力越强，也即该材料的刚性越强且弹性越弱；材料的弹性模量越小，说明该材料抵抗弹性变形的能力越弱，也即该材料的刚性越弱且弹性越强。
在本公开实施例中，在基板10的第一表面101布置第一缓冲层20，在基板10的第二表面102布置第二缓冲层30，在盖板100的两个表面受到撞击时，第一缓冲层20和第二缓冲层30均可以发生形变来吸收应力，实现对基板10的保护，增加盖板100的强度，减小盖板100损坏的可能性。第一缓冲层20的弹性模量在10兆帕斯卡至2吉帕斯卡之间，也即第一缓冲层20的弹性较好，由于第一表面101朝向柔性显示面板，也即弹性较好的第一缓冲层20朝向柔性显示面板，可以增加第一缓冲层20对柔性显示面板的保护效果。第二缓冲层30的弹性模量在60兆帕斯卡至7吉帕斯卡之间，也即第二缓冲层30的刚性较好，使得第二缓冲层30的强度较大，在盖板100受到撞击时，减小应变向基板10传递的量，进一步减小盖板100损坏的可能性。
在盖板100制作完成后对盖板100进行落笔测试或落球测试，也即将一定重量笔或者球在盖板100的一定高度处抛下，笔或者球做自由落体运动对盖板100进行撞击，然后检测盖板100被撞击后的性能，确定盖板100是否合格。本公开实施例提供的盖板100的两个表面均布置有缓冲层，在对盖板100进行落笔测试或落球测试时也能够减小盖板100损坏的可能性，提高盖板100的合格率。
在本公实施例中，笔或者球的重量在10克(g)至15克之间，落笔测试或 落球测试的高度在20厘米(cm)至30厘米之间，保证落笔测试或落球测试的可靠性。
示例性地，笔或者球的重量为13克，落笔测试或落球测试的高度为25厘米。
在本公开实施例中，基板10为超薄玻璃(Ultra Thin Glass，UTG)，超薄玻璃可弯曲、卷曲或折叠，便于柔性显示面板的折叠。同时超薄玻璃的和厚度相对于普通玻璃的厚度要薄很多，可以减小盖板100的厚度，便于设备的小型化。
在本公开实施例中，超薄玻璃是指厚度在30微米(μm)至40微米之间的玻璃。
在本公开实施例中，由于第一缓冲层20位于基板10和柔性显示面板之间，将第一缓冲层20的弹性模量设置在10兆帕斯卡至2吉帕斯卡之间，可以保证第一缓冲层20在受到撞击时能够产生较大的变形来吸收应力，对基板10进行保护，同时还能够对柔性显示面板进行保护。
示例性地，第一缓冲层20的弹性模量为50兆帕斯卡。
在本公开实施例的一种实现方式中，第一缓冲层20为柔性聚氨酯(Polyurethane，PU)层、聚酰亚胺(Polyimides，PI)层和聚甲基丙烯酸甲酯(Polymethyl Methacrylate，PMMA)层中的任一层。柔性聚氨酯、聚酰亚胺和聚甲基丙烯酸甲酯均为高分子涂层，弹性较好，可以保证第一缓冲层20的弹性模量。
在本公开实施例的另一种实现方式中，第一缓冲层20由柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的至少两层层叠而成。例如，第一缓冲层20由柔性聚氨酯层和聚酰亚胺层层叠而成。
在本公开实施例的一种实现方式中，在垂直于第一表面101的方向上，第一缓冲层20的厚度在5微米至40微米之间。既能保证第一缓冲层20的弹性，又避免第一缓冲层20的厚度太厚增加盖板100的厚度。
示例性地，第一缓冲层20的厚度为20微米。
在本公开实施例中，第二缓冲层30位于基板10的第二表面102，也即第二缓冲层30位于基板10远离柔性显示面板的一侧，在盖板100受到撞击时，一般是基板10朝向第二表面102的一侧先受到撞击，将第二缓冲层30的弹性模量设置在60兆帕斯卡至7吉帕斯卡之间，可以保证第二缓冲层30的强度，减小应变向基板10的传递，进一步减小盖板100损坏的可能性。
示例性地，第二缓冲层30的弹性模量为3吉帕斯卡。
在本公开实施例的一种实现方式中，第二缓冲层30为柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的任一层。柔性聚氨酯、聚酰亚胺和聚甲基丙烯酸甲酯的不仅具有弹性，同时还具有一定的刚性，可以保证第二缓冲层30的强度。
在本公开实施例的另一种实现方式中，第二缓冲层30由柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的至少两层层叠而成。例如，第二缓冲层30由柔性聚氨酯层和聚酰亚胺层层叠而成。
在本公开实施例的一种实现方式中，在垂直于第一表面101的方向上，第二缓冲层30厚度在5微米至40微米之间。既能保证第二缓冲层30的强度，又避免第一缓冲层20的厚度太厚增加盖板100的厚度。
示例性地，第二缓冲层30的厚度为30微米。
图2是本公开实施例提供的一种盖板的截面示意图。参见图2，盖板100还包括第一弹性层40，第一弹性层40层叠在第二缓冲层30远离基板10的一侧面。
在本公开实施例中，在第二缓冲层30远离基板10的一侧面布置第一弹性层40，也即第一弹性层40位于朝向基板10的第二表面102的一侧面。在盖板100受到撞击时，一般是基板10朝向第二表面102的一侧先受到撞击，也即第一弹性层40先受到撞击，第一弹性层40受到撞击后变形吸收应力，对第二缓冲层30进行保护，减小第二缓冲层30的变形，那么第二缓冲层30向基板10传递的变形较小，减小基板10的变形，也即可以增加盖板100的强度，减小盖板100损坏的可能性。同时，第一弹性层40的弹性较大，对第二缓冲层30进行保护，避免在落笔测试或落球测试中第二缓冲层30损坏，增加了对超薄玻璃的保护效果。
在本公开实施例的一种实现方式中，第一弹性层40为热塑性聚氨酯(Thermoplastic Urethane，TPU)层。热塑性聚氨酯的弹性较好，保证第一弹性层40的弹性。
在本公开实施例的一种实现方式中，在垂直于第一表面101的方向上，第一弹性层40厚度在25微米至100微米之间。既能保证第一弹性层40的强度，又避免第一弹性层40的厚度太厚增加盖板100的厚度。
示例性地，第一弹性层40的厚度为75微米。
图3是本公开实施例提供的一种盖板的截面示意图。参见图3，盖板100还 包括第一支撑层50，第一支撑层50层叠在第一弹性层40远离基板10的一侧面。
在本公开实施例中，在第一弹性层40远离基板10的一侧布置第一支撑层50，也即第一支撑层50位于第一弹性层40的外侧。在盖板100受到撞击时，第一支撑层50先受到撞击，第一支撑层50的刚性较强，使得第一支撑层50向第一弹性层40传递的应变较小，也即第一弹性层40的变形较小，从而减小向基板10传递的应变，减小基板10损坏的可能性，也即减小盖板100损坏的可能性。同时，第一支撑层50的刚性较强可以增加盖板100的支撑性，保证盖板100的形态。
在本公开实施例的一种实现方式中，第一支撑层50为涤纶树脂(Polyethylene Terephthalate，PET)层。涤纶树脂的刚性较强，保证第一支撑层50的刚性。
在本公开实施例的一种实现方式中，在垂直于第一表面101的方向上，第一支撑层50厚度在50微米至80微米之间。既能保证第一支撑层50的强度，又避免第一支撑层50的厚度太厚增加盖板100的厚度。示例性地，第一支撑层50的厚度为50微米。
图4是本公开实施例提供的一种盖板的截面示意图。参见图4，盖板100还包括保护层60和第一粘接层70。保护层60层叠在第二缓冲层30远离基板10的一侧面，且保护层60为位于第二缓冲层30远离基板10的一侧面所有层中最外侧的层。第一粘接层70位于保护层60和与保护层60相邻的层之间。
在本公开实施例中，在第二缓冲层30远离基板10的最外侧布置保护层60，也即保护层60位于盖板100的最外侧。在盖板100受到磕碰时，保护层60先受到磕碰，保护层60的硬度较高，避免在盖板100的表面形成刮痕。同时，保护层60的刚性较强可以增加盖板100的支撑性，保证盖板100的形态。第一粘接层70用于粘接保护层60和第二缓冲层30，保证盖板100的一体性。
在本公开实施例的一种实现方式中，在垂直于第一表面101的方向上，保护层60厚度在50微米至80微米之间。既能保证保护层60的强度，又避免保护层60的厚度太厚增加盖板100的厚度。示例性地，保护层60的厚度为65微米。
在本公开实施例的一种实现方式中，在垂直于第一表面101的方向上，第一粘接层70厚度在10微米至30微米之间。控制第一粘接层70的厚度，避免第一粘接层70的厚度太厚增加盖板100的厚度。示例性地，第一粘接层70的 厚度为15微米。
在本公开实施例中，第一粘接层70为光学胶(Optically Clear Adhesive，简称：OCA)层。光学胶的粘接性较好，保证保护层60和第二缓冲层30连接的牢固性。
可替代地，在其他实现方式中，第一粘接层70为压敏胶(Pressure Sensitive Adhesive，PSA)层。
在本公开实施例中，在温度在15摄氏度(℃)至35摄氏度时，第一粘接层70的粘性大于700gf/inch。
在本公开实施例中，由于在温度在15摄氏度至35摄氏度时，第一粘接层70的粘性大于700gf/inch，保证第一粘接层70在常温下的粘性，能够将保护层60和第二缓冲层30粘接起来。
需要说明的是，700gf/inch表示在每英寸受到700克的重量。第一粘接层70的粘性大于700gf/inch表示，第一粘接层70每英寸受到的重量大于700克的重量时，才可以将保护层60和第二缓冲层30拆解开来。
在本公开实施例中，在温度在15摄氏度至35摄氏度时，第一粘接层70的蠕变系数大于百分之三百(300％)。也即第一粘接层70易于变形，便于盖板100的弯折。
在本公开实施例中，在温度在15摄氏度至35摄氏度时，第一粘接层70的恢复系数大于百分之八十(80％)。在第一粘接层70弯曲后能够恢复原状。
在本公开实施例中，在温度小于负50摄氏度时，第一粘接层70的粘性小于30gf/inch。
在本公开实施例中，当保护层60损坏，需要将保护层60和第二缓冲层30拆解开来时，将盖板100放置在温度小于负50摄氏度的环境中进行拆解，此时第一粘接层70的粘性小于30gf/inch粘性较弱，便于将保护层60和第二缓冲层30拆解。
在图4所示的盖板中，盖板100包括依次层叠的第一缓冲层20、基板10、第二缓冲层30、第一弹性层40、第一支撑层50、第一粘接层70和保护层60。此时，第一粘接层70用于粘接保护层60和第一支撑层50。
图5是本公开实施例提供的一种盖板的截面示意图。参见图5，盖板100包括依次层叠的第一缓冲层20、基板10、第二缓冲层30、第一弹性层40、第一粘接层70和保护层60。此时，第一粘接层70用于粘接保护层60和第一弹性层 40。
图6是本公开实施例提供的一种盖板的截面示意图。参见图6，盖板100包括依次层叠的第一缓冲层20、基板10、第二缓冲层30、第一粘接层70和保护层60。此时，第一粘接层70用于粘接保护层60和第二缓冲层30。
图7是本公开实施例提供的一种盖板的截面示意图。参见图7，盖板100包括依次层叠的第一缓冲层20、基板10、第二缓冲层30、第一支撑层50、第一粘接层70和保护层60。此时，第一粘接层70用于粘接保护层60和第一支撑层50。
再次参见图4至图7，保护层60包括第二支撑层601和防刮层602。第二支撑层601层叠在第一粘接层70远离基板10的一侧面。防刮层602层叠在第二支撑层601远离基板10的一侧面。
在本公开实施例中，将保护层60设置为第二支撑层601和防刮层602，第二支撑层601的刚性较强，增加盖板100的支撑性，保证盖板100的形态。防刮层602的硬度较高，避免在盖板100的表面造成刮痕。同时，还可以使得保护层60具有更好的抗刮擦能力、更高的铅笔硬度、更高的水滴角等性能。
在本公开实施例中，第二支撑层601为涤纶树脂层。涤纶树脂的刚性较强，保证第二支撑层601的刚性。
在本公开实施例中，在垂直于第一表面101的方向上，第二支撑层601厚度在45微米至75微米之间。既能保证第二支撑层601的强度，又避免第二支撑层601的厚度太厚增加盖板100的厚度。示例性地，第二支撑层601的厚度为60微米。
在本公开实施例中，防刮层602可称为硬化(Hard Coating，HC)层。
在本公开实施例中，在垂直于第一表面101的方向上，防刮层602厚度在3微米至10微米之间。既能保证防刮层602的硬度，又避免防刮层602的厚度太厚增加保护层60的厚度。示例性地，防刮层602的厚度为5微米。
图8是本公开实施例提供的一种盖板的制作流程图。参见图8，该方法包括：
在步骤201中，提供一基板。
示例性地，基板为超薄玻璃。
在步骤202中，在基板的第一表面形成第一缓冲层。
在步骤203中，在基板的第二表面形成第二缓冲层。
在本公开实施例中，第一缓冲层和第二缓冲层均为高分子材料层且具有粘性，可直接将第一缓冲层和第二缓冲层分别粘贴在基板的第一表面和第二表面。
可选地，该方法还包括：
在步骤204中，在第二缓冲层远离基板的一侧面形成第一弹性层。
示例性地，第二缓冲层和第一弹性层均具有粘性，将第一弹性层粘贴在第二缓冲层远离基板的侧面。
在步骤205中，在第一弹性层远离第二缓冲层的一侧面形成第一支撑层。
示例性地，将第一支撑层粘贴在第一弹性层远离第二缓冲层的侧面上。
在步骤206中，在第一支撑层远离第一弹性层的一侧面形成保护层。
示例性地，在第一支撑层远离第一弹性层的一侧面上涂敷液态的粘接胶，然后将保护层贴附在粘接胶上，待粘接胶固化后新成第一粘接层，并将第一支撑层和保护层贴粘接起来，形成盖板。
图9是本公开实施例提供的一种显示装置的截面示意图。参见图9，显示装置包括依次层叠的盖板100和柔性显示面板200，盖板100为附图1至附图7任一附图所示的盖板100。
在本公开实施例中，在基板10的第一表面101布置第一缓冲层20，在基板10的第二表面102布置第二缓冲层30，在盖板100的两个表面受到撞击时，第一缓冲层20和第二缓冲层30均可以发生形变来吸收应力，实现对基板10的保护，增加盖板100的强度，减小盖板100损坏的可能性。第一缓冲层20的弹性模量在10兆帕斯卡至2吉帕斯卡之间，也即第一缓冲层20的弹性较好，由于第一表面101朝向柔性显示面板，也即弹性较好的第一缓冲层20朝向柔性显示面板，可以增加第一缓冲层20对柔性显示面板的保护效果。第二缓冲层30的弹性模量在60兆帕斯卡至7吉帕斯卡之间，也即第二缓冲层30的刚性较好，使得第二缓冲层30的强度较大，在盖板100受到撞击时，减小应变向基板10传递的量，进一步减小盖板100损坏的可能性。
在本公开实施例中，柔性显示面板200可以为有机发光二极管(Organic Light-Emitting Diode，OELD)显示面板。
图10是本公开实施例提供的一种显示装置的截面示意图。参见图10，显示装置还包括第二弹性层300，第二弹性层300层叠在柔性显示面板200远离盖板100的一侧面。
在本公开实施例中，在柔性显示面板200远离盖板100的一侧面布置第二弹性层300，也即第二弹性层300和盖板100位于柔性显示面板200的相对两侧。第二弹性层300和盖板100分别从柔性显示面板200的两侧对柔性显示面板200进行保护。第二弹性层300和盖板100均具有弹性，在显示装置受到撞击时，第二弹性层300和盖板100均可以变形对柔性显示面板200进行保护，减小显示装置损坏的可能性，在对显示装置进行落笔或落球测试时，减小显示装置损坏的可能性。同时第二弹性层300还可以起到遮光的作用。
在本公开实施例中，当显示装置为可弯折的显示装置时，在弯折的过程中，第二弹性层300的弹性较好，还可以起到吸收膜层错动量的作用，减小柔性显示面板200脱落或断裂的可能性。
在本公开实施例的一种实现方式中，第二弹性层300的拉伸强度在5兆帕斯卡至10兆帕斯卡之间。
在本公开实施例中，将第二弹性层300的拉伸强度设定在5兆帕斯卡至10兆帕斯卡之间，保证第二弹性层300的弹性。示例性地，第二弹性层300的拉伸强度为8兆帕斯卡。
在本公开实施例的一种实现方式中，第二弹性层300为热塑性聚氨酯弹性体橡胶层、泡棉层、涤纶树脂层、聚酰亚胺、光学胶层中的任一层。
在本公开实施例中，热塑性聚氨酯弹性体橡胶、泡棉、涤纶树脂、聚酰亚胺和光学胶均具有弹性，保证第二弹性层300的弹性。
在本公开实施例的另一种实现方式中，第二弹性层300由热塑性聚氨酯弹性体橡胶层、泡棉层、涤纶树脂层、聚酰亚胺层、光学胶层中的至少两层层叠而成。
示例性地，第二弹性层300为热塑性聚氨酯弹性体橡胶层、泡棉层和涤纶树脂层层叠而成。
在本公开实施例的一种实现方式中，在垂直于第一表面101的方向上，第二弹性层300厚度在5微米至30微米之间。既能保证第二弹性层300的强度，又避免第二弹性层300的厚度太厚增加显示装置的厚度。示例性地，第二弹性层300的厚度为20微米。
再次参见图10，沿第一方向a，盖板100的长度L1大于柔性显示面板200的长度L2，第一方向a与显示装置弯折时的弯折线的延伸方向垂直，且第一方向a与第一表面101平行。
在本公开实施例中，盖板100的长度L1比柔性显示面板200的长度L2要长一些，在组装的过程中可以对柔性显示面板200的侧面进行保护，避免磕碰对柔性显示面板200的侧面造成损伤。
在本公开实施例中，第二弹性层300和柔性显示面板200是一体切割的，所以第二弹性层300的长度等于柔性显示面板200的长度，盖板100通过第二粘接层400与柔性显示面板200粘接。
在本公开实施例的一种实现方式中，在垂直于第一表面101的方向上，第二粘接层400厚度在25微米至100微米之间。避免第二粘接层400的厚度太厚增加显示装置的厚度。示例性地，第二粘接层400的厚度为50微米。
在本公开实施例中，第二粘接层400为光学胶层。光学胶的粘接性较好，保证盖板100和柔性显示面板200连接的牢固性。
可替代地，在其他实现方式中，第二粘接层400为压敏胶层。
再次参见图10，显示装置还包括支撑板500，支撑板500对第二弹性层300和柔性显示面板200进行支撑，保证显示装置的形态。
在本公开实施例中，支撑板500的弹性模量大于700兆帕，支撑板500的抗拉强度大于1000兆帕，保证支撑板500的强度和支撑性能。
在本公开实施例中，当显示装置为可弯折的显示装置时，可以对支撑板500的弯折区域进行图形化处理，使得支撑板500的弯折区域形成镂空，在弯折的过程中可以释放应力，便于支撑板500弯折，且使得支撑板500具有更小的弯折半径。
在本公开实施例中，支撑板500可以为不锈钢板、铝合金板或钛合金板。
在本公开实施例的一种实现方式中，在垂直于第一表面101的方向上，支撑板500厚度在20微米至200微米之间。既能保证支撑板500的强度和支撑性，又避免支撑板500的厚度太厚增加显示装置的厚度。示例性地，支撑板500的厚度为100微米。
再次参见图10，显示装置还包括偏光片(Polarizer，pol)600，偏光片600位于柔性显示面板200和盖板100之间。
在本公开实施例的一种实现方式中，偏光片600的厚度在40微米至100微米之间。示例性地，偏光片600的厚度为50微米。
再次参见图10，显示装置还包括背膜(Back Film，BF)700，背膜700位于柔性显示面板200和支撑板500之间。
在本公开实施例的一种实现方式中，背膜700厚度在5微米至100微米之间。示例性地，背膜700的厚度为50微米。
以上所述仅为本公开的可选实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (14)

  1. 一种盖板，其特征在于，所述盖板(100)用于柔性显示面板(200)，所述盖板(100)包括：
    基板(10)，具有相对的第一表面(101)和第二表面(102)，所述第一表面(101)朝向所述柔性显示面板(200)；
    第一缓冲层(20)，层叠在所述第一表面(101)，所述第一缓冲层(20)的弹性模量在10兆帕斯卡至2吉帕斯卡之间；
    第二缓冲层(30)，层叠在所述第二表面(102)，所述第二缓冲层(30)的弹性模量在60兆帕斯卡至7吉帕斯卡之间。
  2. 根据权利要求1所述的盖板，其特征在于，所述第一缓冲层(20)为柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的任一层，或者，所述第一缓冲层(20)由柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的至少两层层叠而成；
    所述第二缓冲层(30)为柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的任一层，或者，所述第二缓冲层(30)由柔性聚氨酯层、聚酰亚胺层和聚甲基丙烯酸甲酯层中的至少两层层叠而成。
  3. 根据权利要求1所述的盖板，其特征在于，在垂直于所述第一表面(101)的方向上，所述第一缓冲层(20)的厚度在5微米至40微米之间，所述第二缓冲层(30)的厚度在5微米至40微米之间。
  4. 根据权利要求1至3任一项所述的盖板，其特征在于，所述盖板(100)还包括：
    第一弹性层(40)，层叠在所述第二缓冲层(30)远离所述基板(10)的一侧面。
  5. 根据权利要求4所述的盖板，其特征在于，所述第一弹性层(40)为热塑性聚氨酯层。
  6. 根据权利要求4所述的盖板，其特征在于，所述盖板(100)还包括：
    第一支撑层(50)，层叠在所述第一弹性层(40)远离所述基板(10)的一侧面。
  7. 根据权利要求6所述的盖板，其特征在于，所述第一支撑层(50)为涤纶树脂层。
  8. 根据权利要求5至7任一项所述的盖板，其特征在于，所述盖板(100)还包括：
    保护层(60)，层叠在所述第二缓冲层(30)远离所述基板(10)的一侧面，且所述保护层(60)为位于所述第二缓冲层(30)远离所述基板(10)的一侧面所有层中最外侧的层；
    第一粘接层(70)，粘接在所述保护层(60)和与所述保护层(60)相邻的层之间。
  9. 根据权利要求8所述的盖板，其特征在于，所述保护层(60)包括：
    第二支撑层(601)，层叠在所述第一粘接层(70)远离所述基板(10)的一侧面；
    防刮层(602)，层叠在所述第二支撑层(601)远离所述基板(10)的一侧面。
  10. 根据权利要求9所述的盖板，其特征在于，在温度在15摄氏度至35摄氏度时，所述第一粘接层(70)的粘性大于700gf/inch，所述第一粘接层(70)的蠕变系数大于百分之三百，所述第一粘接层(70)的恢复系数大于百分之八十；
    在温度小于负50摄氏度时，所述第一粘接层(70)的粘性小于30gf/inch。
  11. 一种显示装置，其特征在于，所述显示装置包括依次层叠的盖板(100)和柔性显示面板(200)，所述盖板为权利要求1至10任一项所述的盖板。
  12. 根据权利要求11所述的显示装置，其特征在于，所述显示装置还包括：
    第二弹性层(300)，层叠在所述柔性显示面板(200)远离所述盖板(100)的一侧面，所述第二弹性层(300)的拉伸强度在5兆帕斯卡至10兆帕斯卡之间。
  13. 根据权利要求12所述的显示装置，其特征在于，所述第二弹性层(300)为热塑性聚氨酯弹性体橡胶层、泡棉层、涤纶树脂层、聚酰亚胺、光学胶层中的任一层，或者，所述第二弹性层(300)由热塑性聚氨酯弹性体橡胶层、泡棉层、涤纶树脂层、聚酰亚胺层、光学胶层中的至少两层层叠而成。
  14. 根据权利要求11至13任一项所述的显示装置，其特征在于，在第一方向上，所述盖板(100)的长度大于所述柔性显示面板(200)的长度，所述第 一方向与所述显示装置弯折时的弯折线的延伸方向垂直，且所述第一方向与所述第一表面(101)平行。
PCT/CN2021/128419 2021-03-05 2021-11-03 盖板和显示装置 WO2022183757A1 (zh)

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