WO2021098095A1 - 柔性显示装置 - Google Patents

柔性显示装置 Download PDF

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Publication number
WO2021098095A1
WO2021098095A1 PCT/CN2020/079593 CN2020079593W WO2021098095A1 WO 2021098095 A1 WO2021098095 A1 WO 2021098095A1 CN 2020079593 W CN2020079593 W CN 2020079593W WO 2021098095 A1 WO2021098095 A1 WO 2021098095A1
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WO
WIPO (PCT)
Prior art keywords
flexible display
porous material
display device
material layer
layer
Prior art date
Application number
PCT/CN2020/079593
Other languages
English (en)
French (fr)
Inventor
李成龙
Original Assignee
武汉华星光电半导体显示技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US16/966,054 priority Critical patent/US11877502B2/en
Publication of WO2021098095A1 publication Critical patent/WO2021098095A1/zh

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Classifications

    • 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
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/02—Layer formed of wires, e.g. mesh
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/085—Layered products comprising a layer of metal comprising metal 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 comprising polyolefins
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/09—Layered products comprising a layer of metal comprising metal 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 comprising polyesters
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B3/18—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
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    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/046—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific 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
    • B32B2266/00—Composition of foam
    • B32B2266/12—Gel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • 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
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    • 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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/206—Organic displays, e.g. 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
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    • 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
    • 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
    • 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 application relates to a flexible display device, and more particularly, to a flexible display device that can reduce the stress experienced by the flexible substrate when the flexible substrate is bent, and avoid damage and cracking of the circuit, thereby improving the yield.
  • borderless OLED displays have become one of the current important development trends.
  • pad bending (PAD bending) technology has become one of the keys to determining yield.
  • the liner bending process refers to bending the flexible OLED liner area and attaching it to the back to achieve the effect of full-screen display.
  • the flexible substrate of the flexible OLED panel is in direct contact with the backplane (Black Plate, BP), and the flexible substrate is stressed when the flexible substrate is bent, and the circuit provided on the flexible substrate is damaged and cracked, which reduces the yield.
  • BP Black Plate
  • the present application provides a flexible display device that can reduce the stress experienced by the flexible substrate when the flexible substrate is bent, avoid damage and cracking of the circuit, and thereby improve the yield.
  • a flexible display device comprising: a flexible display panel, the flexible display panel comprising a display area, a bending area and a binding area, the bending area is located between the display area and the binding area; a first backplane, The first backplane is located on the non-display surface of the display area; and the second backplane is located on the non-binding surface of the binding area; wherein, the first backplane and the At least one of the second backplanes is a backplane structure, and the backplane structure includes a support layer and a porous material layer, and the porous material layer is attached to the flexible display panel at the end of the bending area.
  • the support layer and the porous material layer are laminated and arranged, and the porous material layer is arranged between the support layer and the flexible display panel.
  • the thickness of the support layer is 60%-80% of the thickness of the backplane structure, and the thickness of the porous material layer is 20%-40% of the thickness of the backplane structure.
  • the thickness of the support layer is 60 ⁇ m-80 ⁇ m, and the thickness of the porous material layer is 20 ⁇ m-40 ⁇ m.
  • the support layer and the porous material layer are laminated, and both the support layer and the porous material layer are attached to the flexible display panel.
  • the support layer and the porous material layer are arranged on the flexible display panel, and both the support layer and the porous material layer are attached to the flexible display panel.
  • the support layer includes a recess, the recess is located on a side of the support layer close to the bending area, and the porous material layer is located in the recess.
  • the backplane structure includes at least one curved surface, and the at least one curved surface is in contact with the end of the bending area.
  • the at least one curved surface includes a curved surface located on the porous material layer or a curved surface formed by the porous material layer and the support layer.
  • the at least one curved surface includes a curved surface of the porous material layer and a curved surface on the support layer.
  • the hardness of the support layer is greater than the hardness of the porous material layer.
  • the material of the support layer is selected from one or more of polyethylene terephthalate plastics and polyethylene materials.
  • a driving chip and a flexible circuit board are provided on the binding surface, and a metal layer and a gasket are further provided on the side of the first backplane away from the flexible display panel.
  • the porous material includes one or more of metal fiber, porous gel, porous rubber, sponge or foam plastic.
  • UV glue is further provided on the surface of the flexible display panel away from the first backplane and the second backplane.
  • the flexible display device is an organic light emitting diode display device.
  • the backplane structure of one embodiment of the present application uses a double-layer structure of a support layer and a porous material layer to reduce the stress between the backplane structure and the flexible display panel with the holes in the porous material.
  • a curved surface is set at the contact position of the display panel to change point contact or line contact into surface contact, which further reduces stress and can avoid circuit damage and cracking, thereby improving yield.
  • FIG. 1 is a cross-sectional view of a flexible display device according to an embodiment of the present invention.
  • FIGS 2(a)-2(e) are cross-sectional views of the backplane structure of the flexible display device according to the embodiment of the present invention.
  • an embodiment of the present invention provides a flexible display device 100, which is an organic light emitting diode (OLED) display device.
  • OLED organic light emitting diode
  • the flexible display device 100 includes a bendable flexible display panel 10.
  • the substrate of the flexible display panel 10 is made of a polymer material such as polyimide plastic, polyetheretherketone, or transparent conductive polyester. In this embodiment, a polyimide (PI) material is used.
  • the flexible display panel 10 can be divided into a display area AA, a bending area BB, and a binding area CC.
  • the display area AA is used to display images.
  • the surface on which the image is displayed in the display area AA is referred to as a display surface 10a.
  • the side opposite to the display surface 10a is referred to as a non-display surface 10b.
  • the bending area BB has an arc shape and is located between the display area AA and the binding area CC.
  • the side of the binding area CC facing away from the display area AA is called the binding surface 10c, and the side facing the display area AA is called the non-binding surface 10d.
  • the binding surface 10c is used to connect a driving chip (Integrated Circuit, IC) 20 and a flexible printed circuit (FPC) 30 and transmit driving signals to the flexible display panel 10.
  • the driver chip (Integrated Circuit, IC) 20 is disposed on a thin film, that is, a Chip On Film (COF) is used.
  • COF Chip On Film
  • the flexible display panel 10 further includes a first back plate 41 and a second back plate 42 for supporting and protecting the flexible display panel 10.
  • the first back plate 41 is disposed on the non-display surface 10b of the display area AA.
  • the second backplane 42 is disposed on the non-binding surface 10d of the binding area CC.
  • the backplane structure 40 includes a support layer 401 and a porous material layer 402.
  • the porous material layer 402 of the backplane structure 40 is attached to the flexible display panel 10 at the end P1 and the end P2 of the bending area BB.
  • the support layer 401 and the porous material layer 402 are stacked on top of each other.
  • the porous material layer 402 is disposed between the support layer 401 and the flexible display panel 10.
  • the thickness of the support layer 401 accounts for 60%-80% of the thickness of the back plate structure 40, which is approximately 60 ⁇ m-80 ⁇ m, and the porous material layer 402 accounts for 20%-40% of the thickness of the back plate structure 40, which is approximately 20 ⁇ m. -40 ⁇ m.
  • the support layer 401 and the porous material layer 402 are arranged side by side on the flexible display panel 10. The support layer 401 and the porous material layer 402 are both attached to the flexible display panel 10. As shown in FIG.
  • the support layer 401 includes a recess 401a, the recess 401a is located on the side of the support layer 401 close to the bending area BB, and the porous material layer 402 is located in the recess 401a.
  • the porous material layer 402 is only provided at the corners of the back plate structure 40.
  • the support layer 401 and the porous material layer 402 are both attached to the flexible display panel 10.
  • the support layer 401 is used to support the flexible display panel 10, and a material with greater hardness may be used.
  • the material of the support layer 401 includes, but is not limited to, one or more of, for example, polyethylene terephthalate (PET) and polyethylene (PE).
  • PET polyethylene terephthalate
  • PE polyethylene
  • the material hardness of the supporting layer 401 is set to be greater than the hardness of the supporting layer material in the prior art. s material.
  • the porous material layer 402 is used to relieve the stress between the backplane structure 40 and the flexible substrate of the flexible display panel 10 and can play a role in protecting the circuits on the flexible display panel 10.
  • the porous material layer 402 may use a material with a lower hardness.
  • the porous material includes, but is not limited to: one or more of metal fiber, porous gel, porous rubber, sponge, or foam plastic.
  • the back plate structure 40 includes at least one curved surface R, and the at least one curved surface R is in contact with the end P1 and the end P2 of the bending area CC.
  • the curved surface R may be provided with a rounded corner, for example.
  • the at least one curved surface R is a curved surface R located on the porous material layer 401.
  • the at least one curved surface R may further include a curved surface R on the porous material layer 401 and a curved surface R on the support layer 402.
  • the at least one curved surface R may also be a curved surface R formed by the porous material layer 401 and the supporting layer 402 together.
  • the at least one curved surface R is in direct contact with the flexible substrate of the flexible display panel 10, so that the backplane structure 40 and the flexible substrate change from point contact or line contact to surface contact, which effectively reduces the difference between the backplane structure 40 and the flexible substrate of the flexible display panel 10. Between the stress.
  • a UV glue that increases the mechanical strength of the flexible display panel 10 is also provided on the surface of the flexible display panel 10 away from the backplane.
  • the coating sequence of the UV glue is generally from the end P1 and the end P2.
  • the flow characteristics of the UV glue cause the UV glue to be thick in the coating start area, and the UV glue in the coating end area to be thin, that is to say, an area between the end P1 and the end P2 is the position where the thickness of the UV glue is the largest. That is, the position where the stress is the greatest, by setting the end P1 and the end P2 in surface contact, the stress in the contact area can be effectively reduced.
  • a metal layer 50 and a gasket 60 are sequentially laminated on a side of the first back plate 41 away from the flexible display panel 10.
  • the metal layer 50 can emit heat that has been generated by the flexible display panel 10 toward the outside, and the metal layer 50 can also be used to conduct static electricity on the organic light emitting display device to avoid the influence of static electricity on the display effect.
  • the metal layer 50 may be a copper foil with good electrical and thermal conductivity.
  • the gasket 60 is used to prevent the display panel from being physically broken or internal signal lines damaged due to a too small bending angle during bending, and can reduce the impact applied to the flexible display panel 10.
  • the liner 60 may include a polymer, such as polypropylene (PP) or polyethylene (PE), and may also include a material with high elasticity, such as rubber.
  • the cushion layer 60 may be formed as foam or gel.
  • the 1 display surface 10a of the flexible display panel 10 is further provided with a cover plate 70 for protecting components such as the flexible display panel 10, and the cover plate 70 may be, for example, glass or plastic.
  • the backplane structure of one embodiment of the present application uses a double-layer structure of a support layer and a porous material layer to reduce the stress between the backplane structure and the flexible display panel with the holes in the porous material. At the same time, the backplane structure is in contact with the flexible display panel.
  • the contact position of the flexible display panel is provided with a curved surface, which converts point contact or line contact into surface contact, which further reduces stress and can avoid circuit damage and cracking, thereby improving yield.
  • one of the first backing plate and the second backing plate may have a double-layer structure of a support layer and a porous material layer, and the other may be an existing backing plate structure.

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Abstract

提供一种柔性显示装置，其包括：柔性显示面板，包括显示区、弯折区和绑定区，弯折区位于显示区和绑定区之间；第一背板，位于显示区的非显示面；以及第二背板，位于绑定区的非绑定面；其中，第一背板和第二背板的至少一个为一背板结构，背板结构包括支撑层与多孔材料层，多孔材料层在弯折区的端部与柔性显示面板贴合。

Description

柔性显示装置 技术领域
本申请涉及一种柔性显示装置，尤其涉及一种能够降低柔性基底弯折时所受的应力，避免线路受损开裂，从而提高良率的柔性显示装置。
 背景技术
随着柔性有机发光器件（Organic Light-Emitting Diode, OLED）显示技术的发展和成熟，无边框OLED显示器成为当前重要的发展趋势之一。在无边框OLED显示器的制造工艺中，衬垫弯折（PAD bending）技术成为决定良率的关键之一。衬垫弯折工艺是指将柔性OLED衬垫区弯折并贴附于背面，以达到全屏显示的效果。在弯折过程中，柔性OLED面板的柔性基底与背板（Black Plate，BP）直接接触，柔性基底弯折时受到应力，设置在柔性基底上的线路受损开裂，降低了良率。
 技术问题
有鉴于此，本申请提供一种能够降低柔性基底弯折时所受的应力，避免线路受损开裂，从而提高良率的柔性显示装置。
 技术解决方案
一种柔性显示装置，其包括：柔性显示面板，所述柔性显示面板包括显示区、弯折区和绑定区，所述弯折区位于显示区和绑定区之间；第一背板，所述第一背板位于所述显示区的非显示面；以及第二背板，所述第二背板位于所述绑定区的非绑定面；其中，所述第一背板和所述第二背板的至少一个为一背板结构，所述背板结构包括支撑层与多孔材料层，所述多孔材料层在所述弯折区的端部与所述柔性显示面板贴合。
在本发明一实施方式中，所述支撑层与所述多孔材料层层叠设置，所述多孔材料层设置于所述支撑层与所述柔性显示面板之间。
在本发明一实施方式中，所述支撑层的厚度为所述背板结构厚度的60%-80%，所述多孔材料层的厚度为所述背板结构厚度的20%-40%。
在本发明一实施方式中，所述支撑层的厚度为60μm-80μm，所述多孔材料层的厚度为20μm-40μm。
在本发明一实施方式中，所述支撑层与所述多孔材料层层叠设置，所述支撑层与所述多孔材料层均与所述柔性显示面板贴合。
在本发明一实施方式中，所述支撑层与所述多孔材料层排列设置于所述柔性显示面板上，所述支撑层与所述多孔材料层均与所述柔性显示面板贴合。
在本发明一实施方式中，所述支撑层包括一凹部，所述凹部位于所述支撑层靠近所述弯折区的一侧，所述多孔材料层位于所述凹部内。
在本发明一实施方式中，所述背板结构包括至少一个曲面，所述至少一个曲面与所述弯折区的端部接触。
在本发明一实施方式中，所述至少一个曲面包括位于所述多孔材料层的一个曲面或者由多孔材料层与所述支撑层共同形成的一个曲面。
在本发明一实施方式中，所述至少一个曲面包括所述多孔材料层的一个曲面和位于所述支撑层上的一个曲面。
在本发明一实施方式中，所述支撑层的硬度大于所述多孔材料层的硬度。
在本发明一实施方式中，所述支撑层的材料选自聚对苯二甲酸类塑料，聚乙烯材料的一种或多种。
在本发明一实施方式中，所述绑定面上设置有驱动芯片和柔性电路板，所述第一背板远离所述柔性显示面板的一侧还设置有金属层和衬垫。
在本发明一实施方式中，所述多孔材料包括：金属纤维、多孔凝胶、多孔橡胶、海绵或泡沫塑料的一个或多个。
在本发明一实施方式中，在所述柔性显示面板远离所述第一背板和所述第二背板的表面还设置有UV胶。
在本发明一实施方式中，所述柔性显示装置为有机发光二极管显示装置。
 有益效果
本申请一实施方式的背板结构通过使用支撑层和多孔材料层双层结构，以多孔材料中具有的孔来降低背板结构与柔性显示面板之间的应力，同时，在背板结构与柔性显示面板接触的位置设置曲面，将点接触或线接触变为面接触，进一步降低了应力，能够避免线路受损开裂，从而提高良率。
 附图说明
为了更清楚地说明本申请中的技术方案，下面将对实施方式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申请的一些实施方式，对于本领域技术人员来讲，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为本发明一实施方式的柔性显示装置的剖视图。
图2（a）-2（e）为本发明的实施方式的柔性显示装置的背板结构的剖视图。
 本发明的实施方式
下面将结合本申请实施方式中的附图，对本申请中的技术方案进行清楚、完整地描述。显然，所描述的实施方式仅仅是本申请一部分实施方式，而不是全部的实施方式。基于本申请中的实施方式，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本申请保护的范围。
请参考图1，本发明一实施方式提供一种柔性显示装置100，其为有机发光二极管（organic light emitting diode，OLED）显示装置。
所述柔性显示装置100包括可弯折的柔性显示面板10。柔性显示面板10的基板的材料采用如聚酰亚胺塑料、聚醚醚酮或透明导电涤纶等高分子材料，在本实施例中，采用聚酰亚胺(Polyimide，PI)材料。柔性显示面板10可分为显示区AA、弯折区BB以及绑定区CC。
显示区AA用于显示图像。将显示区AA中显示图像的表面称为显示面10a。将与显示面10a相反的一面称为非显示面10b。弯折区BB呈弧形，位于显示区AA与绑定区CC之间。将绑定区CC背离显示区AA的一面称为绑定面10c，朝向显示区AA的一面称为非绑定面10d。绑定面10c用来连接驱动芯片（Integrated Circuit，IC）20和柔性电路板（Flexible Printed Circuit，FPC）30并将驱动信号传递至柔性显示面板10。在本发明一实施方式中，驱动芯片（Integrated Circuit，IC）20设置在一薄膜上，即采用覆晶薄膜(Chip On Film，COF)。
柔性显示面板10还包括用于支撑和保护柔性显示面板10的第一背板41和第二背板42。第一背板41设置于显示区AA的非显示面10b上。第二背板42设置于绑定区CC的非绑定面10d。
所述第一背板41和第二背板42中至少一个为一背板结构40。请参考图2（a）-2（c），背板结构40包括支撑层401和多孔材料层402。背板结构40的多孔材料层402在弯折区BB的端部P1和端部P2与柔性显示面板10贴合。具体地，如图2（a）所示，在本申请一实施方式中，支撑层401与多孔材料层402上下层叠设置。多孔材料层402设置于支撑层401与柔性显示面板10之间。在该实施方式中，支撑层401的厚度占背板结构40厚度的60%-80%，大约为60μm-80μm，多孔材料层402占背板结构40厚度的20%-40%，大约为20μm-40μm。如图2（b）所示，在本申请另一实施方式中，支撑层401与多孔材料层402左右排列设置于柔性显示面板10上。支撑层401与多孔材料层402均与柔性显示面板10贴合。如图2（c）所示，在本申请又一实施方式中，支撑层401包括一凹部401a，凹部401a位于支撑层401靠近弯折区BB的一侧，多孔材料层402位于凹部内401a。多孔材料层402仅设置于背板结构40的角部。支撑层401与多孔材料层402均与柔性显示面板10贴合。
支撑层401用于支撑柔性显示面板10，可以使用硬度较大的材料。支撑层401的材料包括但不限于例如聚对苯二甲酸类塑料(Polyethylene terephthalate，PET)，聚乙烯材料(polyethylene，PE)的一种或多种。在本申请的一实施方式中，为了不增加背板结构40的厚度，同时又能维持背板结构40的支撑力，支撑层401的材料硬度设置为比现有技术的支撑层材料的硬度大的材料。
多孔材料层402用于缓解背板结构40与柔性显示面板10的柔性基底之间的应力，能够起到保护柔性显示面板10上的线路的作用。多孔材料层402可以使用硬度较小的材料。所述多孔材料包括但不限于：金属纤维、多孔凝胶、多孔橡胶、海绵或泡沫塑料的一个或多个。
背板结构40包括至少一个曲面R，至少一个曲面R与弯折区CC的端部P1和端部P2相接触。曲面R例如可以是设置一个圆角。在本实施方式中，如图2（a）所示，所述至少一个曲面R为位于所述多孔材料层401的一个曲面R。在本发明其他实施方式中，如图2（d）所示，所述至少一个曲面R还可以包括位于所述多孔材料层401的一个曲面R和位于支撑层402上的一个曲面R。如图2（e）所示，所述至少一个曲面R也可以为由多孔材料层401和支撑层402共同形成的曲面R。
该至少一个曲面R与柔性显示面板10的柔性基底直接接触使得背板结构40与柔性基底从点接触或者线接触变成面接触，有效降低了背板结构40与柔性显示面板10的柔性基底之间的应力。此外，虽然未图示，但在柔性显示面板10远离背板的表面还设置有增加柔性显示面板10机械强度的UV胶，UV胶的涂布顺序一般是从端部P1和端部P2的一个至另一个，UV胶的流动特性导致涂布开始区域的UV胶厚，涂布结束区域的UV胶薄，也就是说端部P1和端部P2的一个区域正是UV胶厚度最大的位置，也就是应力最大的位置，通过将端部P1和端部P2设置为面接触，可以有效降低接触区域的应力。
第一背板41的远离柔性显示面板10的一侧依次层叠有金属层50和衬垫60。金属层50可以将已经由柔性显示面板10产生的热朝向外部发射，并且金属层50还可以用于传导有机发光显示装置上的静电，避免静电对于显示效果的影响。金属层50可以是导电和导热性能较好的铜箔。衬垫60用于避免因弯折时弯折角度过小导致显示面板出现物理断裂或者内部信号线路损坏并且可以减少施加到柔性显示面板10的冲击。衬垫60可以包括聚合物，诸如聚丙烯(PP)或聚乙烯(PE)，也可以包括具有高弹力的材料，例如橡胶。在本发明一实施方式中，衬垫层60可以形成为泡沫或凝胶。
柔性显示面板10的1显示面10a还设置有盖板70，盖板70用于保护柔性显示面板10等部件，盖板70可以为例如玻璃或者塑料。
本申请一实施方式的背板结构通过使用支撑层和多孔材料层的双层结构，以多孔材料中具有的孔来降低背板结构与柔性显示面板之间的应力，同时，在背板结构与柔性显示面板接触的位置设置曲面，将点接触或线接触变为面接触，进一步降低了应力，能够避免线路受损开裂，从而提高良率。
在本申请其他实施方案中，也可以是第一背板和第二背板的其中一个为支撑层和多孔材料层双层结构，另一个为现有的背板结构。
以上对本申请实施方式提供了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施方式的说明只是用于帮助理解本申请。同时，对于本领域的技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。

Claims (16)

  1. 一种柔性显示装置，其特征在于，包括：
    柔性显示面板，所述柔性显示面板包括显示区、弯折区和绑定区，所述弯折区位于显示区和绑定区之间；
    第一背板，所述第一背板位于所述显示区的非显示面；以及
    第二背板，所述第二背板位于所述绑定区的非绑定面；
    其中，所述第一背板和所述第二背板的至少一个为一背板结构，所述背板结构包括支撑层与多孔材料层，所述多孔材料层在所述弯折区的端部与所述柔性显示面板贴合。
  2. 如权利要求1所述的柔性显示装置，其特征在于，所述支撑层与所述多孔材料层层叠设置，所述多孔材料层设置于所述支撑层与所述柔性显示面板之间。
  3. 如权利要求2所述的柔性显示装置，其特征在于，所述支撑层的厚度为所述背板结构厚度的60%-80%，所述多孔材料层的厚度为所述背板结构厚度的20%-40%。
  4. 如权利要求2所述的柔性显示装置，其特征在于，所述支撑层的厚度为60μm-80μm，所述多孔材料层的厚度为20μm-40μm。
  5. 如权利要求1所述的柔性显示装置，其特征在于，所述支撑层与所述多孔材料层层叠设置，所述支撑层与所述多孔材料层均与所述柔性显示面板贴合。
  6. 如权利要求1所述的柔性显示装置，其特征在于，所述支撑层与所述多孔材料层排列设置于所述柔性显示面板上，所述支撑层与所述多孔材料层均与所述柔性显示面板贴合。
  7. 如权利要求1所述的柔性显示装置，其特征在于，所述支撑层包括一凹部，所述凹部位于所述支撑层靠近所述弯折区的一侧，所述多孔材料层位于所述凹部内。
  8. 如权利要求1所述的柔性显示装置，其特征在于，所述背板结构包括至少一个曲面，所述至少一个曲面与所述弯折区的端部接触。
  9. 如权利要求8所述的柔性显示装置，其特征在于，所述至少一个曲面包括位于所述多孔材料层的一个曲面或者由多孔材料层与所述支撑层共同形成的一个曲面。
  10. 如权利要求8所述的柔性显示装置，其特征在于，所述至少一个曲面包括所述多孔材料层的一个曲面和位于所述支撑层上的一个曲面。
  11. 如权利要求1所述的柔性显示装置，其特征在于，所述支撑层的硬度大于所述多孔材料层的硬度。
  12. 如权利要求11所述的柔性显示装置，其特征在于，所述支撑层的材料选自聚对苯二甲酸类塑料，聚乙烯材料的一种或多种。
  13. 如权利要求1所述的柔性显示装置，其特征在于，所述绑定面上设置有驱动芯片和柔性电路板，所述第一背板远离所述柔性显示面板的一侧还设置有金属层和衬垫。
  14. 如权利要求1所述的柔性显示装置，其特征在于，所述多孔材料包括：金属纤维、多孔凝胶、多孔橡胶、海绵或泡沫塑料的一个或多个。
  15. 如权利要求1所述的柔性显示装置，其特征在于，在所述柔性显示面板远离所述第一背板和所述第二背板的表面还设置有UV胶。
  16. 如权利要求1所述的柔性显示装置，其特征在于，所述柔性显示装置为有机发光二极管显示装置。
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