WO2019218710A1 - 柔性元件、柔性显示设备及其制作方法 - Google Patents

柔性元件、柔性显示设备及其制作方法 Download PDF

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Publication number
WO2019218710A1
WO2019218710A1 PCT/CN2019/070945 CN2019070945W WO2019218710A1 WO 2019218710 A1 WO2019218710 A1 WO 2019218710A1 CN 2019070945 W CN2019070945 W CN 2019070945W WO 2019218710 A1 WO2019218710 A1 WO 2019218710A1
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Prior art keywords
flexible
layer
base layer
flexible member
flexible display
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PCT/CN2019/070945
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English (en)
French (fr)
Inventor
王浩然
卜德军
蔡宝鸣
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京东方科技集团股份有限公司
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Priority to US16/620,897 priority Critical patent/US11380856B2/en
Publication of WO2019218710A1 publication Critical patent/WO2019218710A1/zh

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    • 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
    • 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
    • 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
    • B32B15/043—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 metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
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    • 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
    • B32B5/14—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 a layer differing constitutionally or physically in different parts, e.g. denser near its faces
    • B32B5/142—Variation across the area of the layer
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/04—4 layers
    • 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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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    • B32B2457/206—Organic displays, e.g. OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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    • 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
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    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • Embodiments of the present disclosure relate to the field of display technologies, and in particular, to a flexible display device and a method of fabricating the same, and a flexible component used in the flexible display device.
  • the OLED display panel is a display panel made of an Organic Light-Emitting Diode (OLED). OLED display panels are more and more popular due to their thin and light (no backlight), high brightness, high definition, deformability and bendability (ie flexibility), energy saving, etc. More attention and recognition. More and more electronic devices are currently using OLED flexible display panels.
  • the flexible display panel is a deformable, bendable display panel made of a flexible material.
  • the flexible display panel breaks through the original concept of the original two-dimensional display and expands the application field of the display to more dimensional and portable electronic devices.
  • the foldable display has received wide attention in the industry.
  • flexible display panels also have their own shortcomings and deficiencies.
  • the flexible display panel is relatively thin and light, so it is inferior in bending resistance and impact resistance; the local large deformation caused by frequent bending may cause denaturation of the polymer material in the display panel, and even the bending region may be folded.
  • the phenomenon of "marks" and "white lines” causes the display panel to fail. Therefore, it is necessary to improve the bending resistance and impact resistance of the flexible display panel.
  • improving the bending resistance and impact resistance of a flexible display panel generally starts from the following two methods: one method is to start from the internal structure of the flexible display panel, that is, to improve the internal structure and material of the flexible display panel. It is difficult and not implementable; another method is to start from the outside of the flexible display panel, for example, a protective cover is additionally applied around the outer contour of the flexible display panel, and the protective cover is used for the flexible display panel. It is well protected, but because the protective cover is tightly enclosed around the flexible display panel, the flexible display panel is blocked, and the protective cover needs to be removed before use for display.
  • some embodiments of the present disclosure provide a flexible member suitable for being disposed on a flexible display panel, the flexible member including: a first base layer and a second base layer disposed opposite to each other; and sandwiching the first base layer and a buffer layer between the second substrate, wherein the flexible member is bendable about a bending axis, and the projection of the buffer layer on a plane perpendicular to the bending axis is wavy.
  • the flexible member further includes: a first fixed layer disposed between the first base layer and the buffer layer; and disposed between the second base layer and the buffer layer The second fixed layer.
  • the first pinned layer and the second pinned layer are adhesive layers.
  • the material of the buffer layer is a metal.
  • the metal is at least one of the following materials: shape memory alloy, spring steel, high hardness stainless steel, hardened aluminum, and aluminum alloy.
  • the wavy shape is a zigzag or sinusoidal waveform.
  • the first base layer and the second base layer are made of a flexible material having a buckling return property.
  • the flexible member may include one undulating buffer layer, and may also include two or more undulating buffer layers.
  • each adjacent wavy buffer layer is separated by a spacer layer, and the spacer layer and each buffer layer may pass through a bonding layer. Bonding.
  • the respective wavy buffer layers may be different in shape and size.
  • a plurality of holes are respectively formed in the first base layer and the second base layer.
  • the plurality of holes have a distribution density in a bending region having a larger radius of curvature of the first base layer than a bending portion having a smaller radius of curvature in the first base layer. a distribution density in the region; and the distribution density of the plurality of holes in the bending region having a larger radius of curvature of the second base layer is greater than a bending region in which the radius of curvature of the second base layer is small Distribution density.
  • each of the plurality of holes extends in the same direction as the bending axis.
  • the buffer layer has a thickness of 40 to 1000 micrometers in a direction perpendicular to the first base layer and the second base layer.
  • the buffer layer has a thickness of 30-300 microns.
  • Some embodiments of the present disclosure also provide a flexible display device comprising: at least one of the above-described flexible members; an adhesive layer; and a flexible display panel, wherein the first base layer of the at least one flexible member is The non-display substrates of the flexible display panel are bonded together by the adhesive layer.
  • the adhesive layer is a pressure sensitive adhensive (PSA).
  • PSA pressure sensitive adhensive
  • the at least one flexible element is a plurality of flexible elements that are stacked one on another and bonded together.
  • Some embodiments of the present disclosure also provide a method of fabricating a flexible display device, comprising the steps of: providing at least one of the above flexible members; providing a flexible display panel; and splicing the at least one flexible member by an adhesive layer A base layer is bonded to the non-display substrate of the flexible display panel to form a flexible display device.
  • FIG. 1 is a schematic cross-sectional view of a flexible display device in an unbent state, in accordance with some embodiments of the present disclosure.
  • FIG. 2 schematically illustrates a perspective structural view of a flexible display device in a bent state in which a flexible member is adhered to the entire back surface of the flexible display panel (integral bonding), in accordance with some embodiments of the present disclosure.
  • FIG. 3 schematically illustrates a cross-sectional view of a flexible display device in a bent state in which a flexible member is bonded over the entire back surface of a flexible display panel, in accordance with some embodiments of the present disclosure.
  • FIG. 4 schematically illustrates a perspective structural view of a flexible display device in a bent state in which a flexible member is bonded (partially bonded) to a portion of the back surface of the flexible display panel, in accordance with some embodiments of the present disclosure.
  • FIG. 5 schematically illustrates a cross-sectional view of a flexible display device in a bent state with a flexible member adhered to a portion of the back surface of the flexible display panel, in accordance with some embodiments of the present disclosure.
  • FIG. 6 schematically illustrates an enlarged cross-sectional view of a layer of flexible member in an unbent state, in accordance with some embodiments of the present disclosure.
  • FIG. 7 schematically illustrates an enlarged cross-sectional view of a flexible display device including a layer of flexible elements in a bent state, in accordance with some embodiments of the present disclosure.
  • FIG. 8 schematically illustrates an enlarged cross-sectional view of a two-layer flexible member in an unbent state, in accordance with some embodiments of the present disclosure.
  • FIG. 9 schematically illustrates an enlarged cross-sectional view of a flexible display device including two layers of flexible elements in a bent state, in accordance with some embodiments of the present disclosure.
  • Fig. 10 schematically shows a top view of a flexible member with a plurality of holes.
  • Figure 11 schematically shows a cross-sectional view of a flexible member with a plurality of holes.
  • FIG. 12 is a schematic diagram of a method of fabricating a flexible display device in accordance with some embodiments of the present disclosure.
  • some embodiments of the present disclosure provide a flexible member adapted to be disposed on a flexible display panel, the flexible member comprising: a first base layer and a second base layer disposed opposite to each other; and sandwiching the first base layer And a buffer layer between the second substrate, wherein the flexible member is bendable about a bending axis, and the projection of the buffer layer on a plane perpendicular to the bending axis is wavy.
  • the flexible member Since the flexible member has a certain mechanical strength and excellent flexibility, when it is disposed on the surface of the non-display substrate of the flexible display panel (ie, the back surface of the flexible display panel),
  • the utility model can improve the overall strength of the flexible display panel, enhance the impact resistance and bending resistance of the flexible display panel, and provide support for the bending region, thereby avoiding failures such as “creases” and “white lines” caused by the concentration of bending stress.
  • the present disclosure exemplifies an OLED display panel in which a top emission (ie, a surface facing away from the flexible component 1 is an emitting surface, that is, a display surface) is exemplified in detail, according to some embodiments of the present disclosure.
  • the flexible member 1 disposed on the surface of the non-display substrate of the flexible display panel 3 ie, the back surface of the flexible display panel 3, that is, the lower surface of the flexible display panel 3 in FIG.
  • the flexible member 1 includes: a first base layer 11 disposed opposite to each other a second base layer 12; and a buffer layer 15 sandwiched between the first base layer 11 and the second base layer 12, wherein the flexible member 1 is bendable about a bending axis (not shown), and the The projection of the buffer layer 15 on a plane perpendicular to the bending axis is wavy. Since the flexible member 1 has a certain mechanical strength and excellent flexibility, when it is disposed on the surface of the non-display substrate of the flexible display panel 3, the overall strength, bending resistance, and impact resistance of the flexible display panel 3 can be improved.
  • the impact resistance and bending resistance of the flexible display panel 3 are enhanced, and the bending region is provided with support to avoid failures such as “creases” and “white lines” caused by the concentration of bending stress. Further, when the display is performed using the flexible display panel 3, display can be performed without first removing the flexible member.
  • the flexible component 1 may further include: a first fixing layer 13 disposed between the first base layer 11 and the buffer layer 15; and a first portion 12 disposed between the second base layer 12 and the buffer layer 15 Two fixed layers 14.
  • Two fixing layers 13, 14 are disposed between the first base layer 11, the second base layer 12 and the buffer layer 15, which facilitates better fixing of the buffer layer 15 to improve the support stability of the buffer layer 15 and the support during support. Force uniformity (load uniformity).
  • first pinned layer 13 and the second pinned layer 14 may be an adhesive layer, mainly functioning to fix the first base layer 11, the second base layer 12, and the buffer layer 15.
  • the bending resistance of the entire flexible member 1 is further improved by the relative shear displacement of the adhesive layer and the slip on the microstructure.
  • the wavy shape of the buffer layer 15 is a zigzag or sinusoidal waveform.
  • the zigzag or sinusoidal waveform is not only easy to manufacture, but also saves manufacturing costs.
  • the inventors have also experimentally proved that the shape of the buffer layer 15 is set to a zigzag or sinusoidal waveform, and the overall strength and impact resistance of the flexible display panel 13 can be well satisfied. Sex and bending resistance requirements.
  • the flexible element may comprise a wave-shaped buffer layer or may comprise two or more wave-shaped buffer layers.
  • each adjacent undulating buffer layer is separated by a spacer layer, and the spacer layer and each buffer layer may be bonded by a bonding layer.
  • the respective wavy buffer layers may be different in shape and size.
  • the material of the buffer layer 15 may be metal (for example, may be in the form of a metal foil).
  • the metal is at least one of the following materials: a shape memory alloy (for example, a heat-stimulated shape memory alloy), a spring steel, a high hardness stainless steel, a hardened aluminum, and an aluminum alloy.
  • the shape memory alloy is a superelastic titanium nickel alloy.
  • the metal material enables the flexible member 1 to have a certain mechanical strength, and when it is disposed on the back surface of the flexible display panel 13, the overall strength of the flexible display panel 13 can be improved. In particular, when the metal material is a shape memory alloy, the bending resistance of the flexible display panel 13 and the recovery ability after bending can be enhanced.
  • the material of the buffer layer 15 is a metal foil, it is characterized by relatively good hardness and rigidity, and has high elastic strength limit and good elastic recovery deformation ability. It should be noted that the material of the buffer layer 15 is not limited to metal as long as it satisfies the support and the requirement for the bending performance of the flexible display device 4.
  • the first base layer 11 and the second base layer 12 are made of a flexible material having a bending recovery property.
  • the first base layer 11 and the second base layer 12 are respectively a planar substrate having a certain strength and bending recovery, which may be the same as the material of the intermediate wave buffer layer 15, and may be, for example, a metal.
  • a plurality of holes 18 are respectively formed in the first base layer 11 and the second base layer 12 (see FIGS. 10-11). Each of the plurality of holes extends in the same direction as the bending axis.
  • the manufacturing method of the hole 18 is not limited to the mechanical opening process, and may be any pattern design method, as long as the specific design shapes of the first and second base layers 11 and 12 can be realized, for example, photolithography and laser processing methods. , machining methods, etc.
  • the distribution density of the plurality of holes 18 in the bending region where the radius of curvature of the first base layer 11 is large is larger than the distribution density in the bending region where the radius of curvature of the first base layer 11 is small.
  • the distribution density of the plurality of holes 18 in the bent region where the radius of curvature of the second base layer 12 is large is larger than the distribution density in the bent region where the radius of curvature of the second base layer 12 is small.
  • the flexible member 1 has a total thickness of 50 to 3000 ⁇ m in a direction perpendicular to the first base layer 11 and the second base layer 12.
  • the two endpoint values of 50 micrometers and 3000 micrometers were finally obtained after repeated experiments by the inventors of the present application. Experiments have shown that if the total thickness of the flexible member 1 is less than 50 ⁇ m, the predetermined support function cannot be achieved if the total thickness of the flexible member 1 is greater than 3000 ⁇ m; the bending performance cannot meet the requirements; the total thickness of the flexible member 1 is 50-3000. Both strength and flexibility are considered in the micrometer range.
  • the buffer layer 15 has a thickness of 40 to 1000 ⁇ m in a direction perpendicular to the first base layer and the second base layer.
  • the buffer layer has a thickness of 30-300 microns.
  • the two endpoint values of 40 micrometers and 1000 micrometers were finally obtained after repeated experiments by the inventors of the present application. Experiments have shown that if the thickness of the buffer layer 15 is less than 40 micrometers, the buffering function is insufficient; if the thickness of the buffer layer 15 is more than 1000 micrometers, the bending flexibility requirement cannot be satisfied; when the thickness of the buffer layer 15 is in the range of 40-1000 micrometers Both cushioning and flexibility.
  • a flexible display device 4 comprising: at least one of the above-described flexible members 1; an adhesive layer 2; and a flexible display panel 3, wherein the at least one flexible member 1 A base layer 11 and the non-display substrate of the flexible display panel 4 are bonded together by the adhesive layer 2.
  • the adhesive layer 2 is a pressure sensitive adhensive (PSA).
  • PSA pressure sensitive adhensive
  • the at least one flexible element 1 may be a plurality of flexible elements 1 which are superposed on each other and bonded together.
  • two flexible elements 1 in the form of two layers are shown in Figures 8 and 9.
  • Another aspect of the present disclosure also provides a method of fabricating a flexible display device 4, comprising the steps of: providing at least one of the flexible elements 1 described above; providing a flexible display panel 3; and disposing the at least one through the adhesive layer 2
  • the first base layer 11 of the flexible member 1 is bonded to the non-display substrate of the flexible display panel 3 to form the flexible display device 4.
  • the step of providing the flexible component 1 specifically includes: providing the first base layer 11 and the second base layer 12; providing the buffer layer 15; and buffering the orientation of the first base layer 11 and the second base layer 12
  • the surface of the layer 15 is respectively coated with the first pinned layer 13 and the second pinned layer 14 having an adhesive layer; finally, the buffer layer 15 is fixedly sandwiched and bonded to the first pinned layer 13 and the second pinned layer 14 Between to form the flexible member 1.
  • the flexible member 1 Since the flexible member 1 has a certain mechanical strength and excellent flexibility, when it is disposed on the surface of the non-display substrate of the flexible display panel 3, the overall strength, bending resistance, and impact resistance of the flexible display panel 3 can be improved.
  • the impact resistance and bending resistance of the flexible display panel 3 are enhanced, and the bending region is provided with support to avoid failures such as “creases” and “white lines” caused by the concentration of bending stress. Further, when the display is performed using the flexible display panel 3, display can be performed without first removing the flexible member.
  • the terms “first” and “second” are used for descriptive purposes only, and are not intended to indicate or imply relative importance, and are not necessarily used to describe a sequential order or a chronological order.
  • the term “plurality” refers to two or more, unless specifically defined otherwise. “Upper”, “lower”, “left”, “right”, etc. are only used to indicate the relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may also change accordingly.
  • the term “comprising” may mean “consisting of” in one embodiment, but may also mean “including at least the defined species and optionally one or more other species” in another embodiment. ".

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Abstract

一种适于设置在柔性显示面板（3）的非显示基板的表面上的柔性元件（1），该柔性元件（1）包括相对设置的第一基层（11）和第二基层（12）以及夹于第一基层（11）和第二基层（12）之间的缓冲层（15）。该柔性元件（1）能够绕一弯折轴线进行弯折，且该缓冲层（15）在垂直于该弯折轴线的平面上的投影呈波状。当柔性元件（1）设置在柔性显示面板（3）的非显示基板的表面时，能够提高柔性显示面板（3）的整体强度、耐弯折性和抗冲击性。

Description

柔性元件、柔性显示设备及其制作方法
相关申请
本申请要求保护在2018年5月18日提交的申请号为201810480205.2的中国专利申请的优先权，该申请的全部内容以引用的方式结合到本文中。
技术领域
本公开的实施例涉及显示技术领域，尤其涉及一种柔性显示设备及其制作方法，以及该柔性显示设备中所使用的柔性元件。
背景技术
智能化、便携化、柔性化是当前电子设备的几个主要发展方向。OLED显示面板是利用有机发光二极管(Organic Light-Emitting Diode，OLED)制成的显示面板。OLED显示面板由于其轻薄(不需背光源)、画面显示的高亮度、高清晰度、可变形性和可弯曲性(即柔性)、节能等特点，特别是柔性的突出特点，受到越来越多的关注和认可。当前越来越多的电子设备采用了OLED柔性显示面板。柔性显示面板是由柔性材料制成的、可变形、可弯曲的显示面板。
柔性显示面板相对与传统的刚性显示面板最突出的优势在于，突破了原有的二维显示的固有理念，将显示器的应用领域拓展到更多维度、更便携的电子设备中。可折叠显示作为新一代柔性显示技术的发展方向之一，已经得到了业内的广泛关注。但是，柔性显示面板也具有其自身的缺点和不足。举例而言，柔性显示面板由于相当轻薄，因此耐弯折性、抗冲击性较差；频繁弯折引起的局部大变形量可能导致显示面板中的高分子材料变性，甚至弯折区出现“折痕”、“白线”等现象，造成显示面板失效。因此，对柔性显示面板的耐弯折性和抗冲击性进行改进实为必需。
目前，改进柔性显示面板的耐弯折性和抗冲击性通常从以下两个方法入手：一种方法是从柔性显示面板的内部结构入手，即改进柔性显示面板的内部结构和材料，这种方法难度较大，可实施性不强；另一种方法是从柔性显示面板的外部入手，例如在柔性显示面板的外轮廓周围额外地施加一个保护罩，这种保护罩虽然对柔性显示面板起到了很好地保护，但是由于保护罩严严实实地围封在柔性显示面板周围， 对柔性显示面板进行了阻挡，使用时需要先将保护罩移除才能够进行显示。
发明内容
有鉴于此，本公开的一些实施例提供一种适于设置在柔性显示面板上的柔性元件，该柔性元件包括：相对设置的第一基层和第二基层；以及夹于所述第一基层和第二基层之间的缓冲层，其中，该柔性元件能够绕一弯折轴线进行弯折，且该缓冲层在垂直于该弯折轴线的平面上的投影呈波状。
根据本公开一些实施例的一个方面，所述的柔性元件，还包括：设置在该第一基层和该缓冲层之间的第一固定层；以及设置在该第二基层和该缓冲层之间的第二固定层。
根据本公开一些实施例的一个方面，所述第一固定层和第二固定层为粘性层。
根据本公开一些实施例的一个方面，所述缓冲层的材料为金属。
根据本公开一些实施例的一个方面，所述金属为下列材料中的至少一种：形状记忆合金、弹簧钢、高硬度不锈钢、硬化铝及铝合金。
根据本公开一些实施例的一个方面，所述波状为锯齿形或正弦波形。
根据本公开一些实施例的一个方面，所述第一基层和第二基层由具有弯折回复性的柔性材料制成。
根据本公开一些实施例的一个方面，所述柔性元件可以包含一个波浪形缓冲层，也可以包含两个或两个以上波浪形缓冲层。
根据本公开一些实施例的一个方面，当包含多个波浪形缓冲层时，各相邻波浪形缓冲层之间由间隔基层隔开，所述间隔基层与各缓冲层之间可通过粘结层进行粘结。另外，当包含多个波浪形缓冲层时，各个波浪形缓冲层在形状和尺寸上可以互不相同。
根据本公开一些实施例的一个方面，所述第一基层和第二基层中分别开设有多个孔洞。
根据本公开一些实施例的一个方面，所述多个孔洞在所述第一基层的曲率半径较大的弯折区域中的分布密度大于其在所述第一基层的曲率半径较小的弯折区域中的分布密度；且所述多个孔洞在所述第二基层的曲率半径较大的弯折区域中的分布密度大于其在所述第二基层 的曲率半径较小的弯折区域中的分布密度。
根据本公开一些实施例的一个方面，多个孔洞中每个孔洞的延伸方向和所述弯折轴线的方向相同。
根据本公开一些实施例的一个方面，在垂直于所述第一基层和第二基层的方向上，所述缓冲层的厚度为40-1000微米。可选地，所述缓冲层的厚度为30-300微米。
本公开的一些实施例还提供一种柔性显示设备，其包括：至少一个以上所述的柔性元件；黏接层；以及柔性显示面板，其中，所述至少一个柔性元件的第一基层与所述柔性显示面板的非显示基板通过所述黏接层黏接在一起。
根据本公开一些实施例的一个方面，所述黏接层为压敏胶(pressure sensitive adhensive，PSA)。
根据本公开一些实施例的一个方面，所述至少一个柔性元件为多个柔性元件，所述多个柔性元件相互叠置并黏合在一起。
本公开的一些实施例还提供一种柔性显示设备的制作方法，包括以下步骤：提供至少一个以上所述的柔性元件；提供柔性显示面板；以及通过黏接层将所述至少一个柔性元件的第一基层与所述柔性显示面板的非显示基板黏接在一起，以形成柔性显示设备。
附图说明
下面通过参考附图来示例性地说明本公开触摸屏的具体实施方式。另外，需要注意的是，该说明并不以任何方式对本公开进行限制，在这些附图中：
图1为根据本公开的一些实施例的柔性显示设备处于未弯折状态的示意性截面图。
图2示意性地示出了根据本公开一些实施例的柔性显示设备处于弯折状态的立体结构图，其中柔性元件黏接在柔性显示面板的整个背面上(整体黏接)。
图3示意性地示出了根据本公开一些实施例的柔性显示设备处于弯折状态的截面图，其中柔性元件黏接在柔性显示面板的整个背面上。
图4示意性地示出了根据本公开一些实施例的柔性显示设备处于弯折状态的立体结构图，其中柔性元件黏接在柔性显示面板的部分背面上(部分黏接)。
图5示意性地示出了根据本公开一些实施例的柔性显示设备处于弯折状态的截面图，其中柔性元件黏接在柔性显示面板的部分背面上。
图6示意性地示出了根据本公开的一些实施例的一层柔性元件处于未弯折状态的放大截面图。
图7示意性地示出了根据本公开的一些实施例的包含一层柔性元件的柔性显示设备处于弯折状态的放大截面图。
图8示意性地示出了根据本公开的一些实施例的双层柔性元件处于未弯折状态的放大截面图。
图9示意性地示出了根据本公开的一些实施例的包含两层柔性元件的柔性显示设备处于弯折状态的放大截面图。
图10示意性地示出了开设有多个孔洞的柔性元件的俯视图。
图11示意性地示出了开设有多个孔洞的柔性元件的截面图。
图12为根据本公开的一些实施例的柔性显示设备的制作方法示意图。
具体实施方式
本公开的一些实施例的目的在于，提供一种适用于设置在柔性显示面板的背面以提高其耐弯折性和抗冲击性的柔性元件，使用柔性显示面板时无需先将柔性元件移除就能够进行显示。
为了达到该目的，本公开的一些实施例提供一种适于设置在柔性显示面板上的柔性元件，该柔性元件包括：相对设置的第一基层和第二基层；以及夹于所述第一基层和第二基层之间的缓冲层，其中，该柔性元件能够绕一弯折轴线进行弯折，且该缓冲层在垂直于该弯折轴线的平面上的投影呈波状。
由于该柔性元件具有一定的机械强度和优良的柔韧性，当其设置在柔性显示面板的非显示基板的表面(即柔性显示面板的背面)时，
能够提高柔性显示面板的整体强度，增强柔性显示面板的抗冲击性和耐弯折性，并为弯折区提供支撑，避免由于弯折应力集中产生的“折痕”“白线”等失效。
请一并参照图1-12，本公开以顶发射(即，背向柔性元件1的表面为发射面，即显示面)的OLED显示面板为例进行详细阐述，根据本公开一些实施例的适于设置在柔性显示面板3的非显示基板的表面(即柔性显示面板3的背面，也即图1中柔性显示面板3的下表面) 上的柔性元件1包括：相对设置的第一基层11和第二基层12；以及夹于所述第一基层11和第二基层12之间的缓冲层15，其中，该柔性元件1能够绕一弯折轴线(图未示出)进行弯折，且该缓冲层15在垂直于该弯折轴线的平面上的投影呈波状。由于该柔性元件1具有一定的机械强度和优良的柔韧性，当其设置在柔性显示面板3的非显示基板的表面时，能够提高柔性显示面板3的整体强度、耐弯折性和抗冲击性，增强柔性显示面板3的抗冲击性和耐弯折性，并为弯折区提供支撑，避免由于弯折应力集中产生的“折痕”“白线”等失效。并且，使用柔性显示面板3进行显示时，无需先将柔性元件移除就能够进行显示。
可选地，该柔性元件1还可以包括：设置在该第一基层11和该缓冲层15之间的第一固定层13；以及设置在该第二基层12和该缓冲层15之间的第二固定层14。在第一基层11、第二基层12和缓冲层15之间设置两个固定层13，14，便于对缓冲层15进行更好地固定，以提高缓冲层15的支承稳定性和支承时的受力均匀性(载荷均匀性)。
进一步地，第一固定层13和第二固定层14可以为粘性层，主要是起到固定第一基层11、第二基层12和缓冲层15的作用。通过该粘性层的相对剪切位移和微观结构上的滑蠕，进一步提高整个柔性元件1的耐弯折性能。
进一步地，缓冲层15的波状为锯齿形或正弦波形。锯齿形或正弦波形不但便于制造，节省制造成本，同时发明人经过实验也证明，将缓冲层15的形状设置为锯齿形或正弦波形也能够很好地满足柔性显示面板13的整体强度、抗冲击性和耐弯折性的要求。
可选地，所述柔性元件可以包含一个波浪形缓冲层，也可以包含两个或两个以上波浪形缓冲层。当包含多个波浪形缓冲层时，各相邻波浪形缓冲层之间由间隔基层隔开，所述间隔基层与各缓冲层之间可通过粘结层进行粘结。另外，当包含多个波浪形缓冲层时，各个波浪形缓冲层在形状和尺寸上可以互不相同。
可选地，所述缓冲层15的材料可以为金属(例如可为金属箔片形式)。所述金属为下列材料中的至少一种：形状记忆合金(例如为热刺激型形状记忆合金)、弹簧钢、高硬度不锈钢、硬化铝及铝合金。举例而言，该形状记忆合金为超弹性钛镍合金。金属材料能够使该柔性元件1具有一定的机械强度，保证其设置在柔性显示面板13的背面 时，能够提高柔性显示面板13的整体强度。尤其是，当金属材料为形状记忆合金时，能增强柔性显示面板13的抗弯折性能及弯折后的恢复能力。另外，当缓冲层15的材料为金属箔片时，其特征为硬度及刚度相对较好，且其弹性强度极限高，弹性回复形变能力好。需要说明的是，所述缓冲层15的材料不限于金属，只要其能满足支撑性及对应柔性显示设备4的弯折性能的需求即可。
可选地，第一基层11和第二基层12由具有弯折回复性的柔性材料制成。第一基层11和第二基层12分别是一种平面基材，有一定的强度和弯折回复性，其可以与中间波形缓冲层15的材料相同，例如可以为金属。
进一步地，第一基层11和第二基层12中分别开设有多个孔洞18(参见图10-11)。多个孔洞中每个孔洞的延伸方向和所述弯折轴线的方向相同。通过在第一、第二基层11，12上设置孔洞18或沟槽，改善柔性元件1的整体受力均匀性，并分散整体形变量，进一步提高该柔性元件1的耐弯折性能。孔洞18的制作方法不限于机械开孔工艺，可以是任何图案化设计方法，只要能实现制作第一、第二基层11，12的特定设计形状即可，例如可以是光刻法、激光加工方法、机械加工方法等。
进一步地，多个孔洞18在所述第一基层11的曲率半径较大的弯折区域中的分布密度大于其在所述第一基层11的曲率半径较小的弯折区域中的分布密度。多个孔洞18在所述第二基层12的曲率半径较大的弯折区域中的分布密度大于其在所述第二基层12的曲率半径较小的弯折区域中的分布密度。这样设置可以使柔性元件1整体上尽可能均匀弯曲，以减少弯折区基层的应力集中，进一步提高耐弯折性能。避免由于弯折应力集中产生的“折痕”“白线”等失效。
可选地，在垂直于所述第一基层11和第二基层12的方向上，所述柔性元件1的总厚度为50-3000微米。两个端点值50微米和3000微米，是本申请发明人经过反复实验后才最终获得的。实验表明，柔性元件1的总厚度小于50微米的话，过薄不能实现预定支撑功能；柔性元件1的总厚度大于3000微米的话，弯折性能不能满足要求；柔性元件1的总厚度处于50-3000微米的区间内时，兼顾强度和柔韧性。
可选地，在垂直于所述第一基层和第二基层的方向上，所述缓冲 层15的厚度为40-1000微米。可选地缓冲层的厚度为30-300微米。两个端点值40微米和1000微米，是本申请发明人经过反复实验后才最终获得的。实验表明，缓冲层15的厚度小于40微米的话，缓冲功能不充分；缓冲层15的厚度大于1000微米的话，不能满足弯折柔韧性要求；缓冲层15的厚度处于40-1000微米的区间内时，兼顾缓冲和柔韧性。
本公开的另一个方面还提供一种柔性显示设备4，其包括：至少一个以上所述的柔性元件1；黏接层2；以及柔性显示面板3，其中，所述至少一个柔性元件1的第一基层11与所述柔性显示面板4的非显示基板通过所述黏接层2黏接在一起。
可选地，所述黏接层2为压敏胶(pressure sensitive adhensive，PSA)。所述至少一个柔性元件1可以为多个柔性元件1，所述多个柔性元件1相互叠置并黏合在一起。例如图8和图9所示的呈两层形式的两个柔性元件1。
本公开的另一个方面还提供一种柔性显示设备4的制作方法，包括以下步骤：提供至少一个以上所述的柔性元件1；提供柔性显示面板3；以及通过黏接层2将所述至少一个柔性元件1的第一基层11与所述柔性显示面板3的非显示基板黏接在一起，以形成柔性显示设备4。
具体地，以单层柔性元件1为例，提供柔性元件1的步骤具体包括：提供第一基层11和第二基层12；提供缓冲层15；在第一基层11和第二基层12的朝向缓冲层15的表面分别涂覆具有粘性层的第一固定层13和第二固定层14；最后，再将缓冲层15固定地夹置并粘结在第一固定层13和第二固定层14之间，以形成柔性元件1。
由于该柔性元件1具有一定的机械强度和优良的柔韧性，当其设置在柔性显示面板3的非显示基板的表面时，能够提高柔性显示面板3的整体强度、耐弯折性和抗冲击性，增强柔性显示面板3的抗冲击性和耐弯折性，并为弯折区提供支撑，避免由于弯折应力集中产生的“折痕”“白线”等失效。并且，使用柔性显示面板3进行显示时，无需先将柔性元件移除就能够进行显示。
应当理解，尽管在以上的叙述中已经阐明了本公开的基本构造、运作机制、各种特征和有益效果以及本公开的具体细节，但是这些内容仅仅是示范性的，其具体细节，尤其是在本公开原理的范围内可以 被具体改变成由本公开利要求书所主张的由宽泛上位意思所表示的整体范围。
本公开权利要求书中的措辞“一”或“一个”不排除复数，其仅仅旨在叙述的方便，不应当理解为对本公开保护范围的限缩。在本公开中，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性，也不一定用于描述顺序次序或时间次序。术语“多个”指两个或两个以上，除非另有明确的限定。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。用语“包括”可在一个实施例中是指“由......组成”，但可在另一个实施例中也指“包含至少所限定种类并且可选地包含一个或多个其他种类”。一些实施例可以通过使用表达“一实施例”或“一些实施例”连同它们的派生词而被描述。这些术语是指结合实施例描述的特定特征、结构或特性被包括在至少一个实施例中。在申请书的各个地方出现的词组“在一个实施例中”不一定必须全都指同一个实施例。术语“和/或”特别地涉及“和/或”之前和之后所提及项目中的一个或多个。比如，短语“项目1和/或项目2”和类似短语可涉及项目1和项目2中的一个或多个。本领域技术人员将理解本文中(诸如在“基本上由......组成”中)的术语“基本上”。术语“基本上”还可包括具有“整个地”、“完全地”、“所有”等的实施例。因此，在实施例中，形容词基本上也是可移除的。在适用的情况下，术语“基本上”还可涉及90％或更高、诸如95％或更高、特别地99％或更高、甚至更特别地99.5％或更高、包括100％。
除非另有限定，用在本说明书中的所有技术和科学术语具有与本公开所属的领域中熟练的技术人员所通常理解的意义相同的意义。
应当理解，本公开的柔性元件、柔性显示设备及其制作方法并不局限于上述实例所述。任何本领域技术人员在阅读了本公开后，结合现有技术不经过创造性思考所构思出的变形或等同均涵盖在本公开所主张的权利要求书中。

Claims (15)

  1. 一种适于设置在柔性显示面板的柔性元件，该柔性元件包括：
    相对设置的第一基层和第二基层；以及
    夹于所述第一基层和第二基层之间的至少一个缓冲层，
    其中，该柔性元件能够绕一弯折轴线进行弯折，且该至少一个缓冲层在垂直于该弯折轴线的平面上的投影呈波状。
  2. 根据权利要求1所述的柔性元件，还包括：
    设置在该第一基层和该至少一个缓冲层之间的第一固定层；以及
    设置在该第二基层和该至少一个缓冲层之间的第二固定层。
  3. 根据权利要求3所述的柔性元件，其中，所述第一固定层和第二固定层为粘性层。
  4. 根据权利要求1所述的柔性元件，其中，所述至少一个缓冲层的材料为金属。
  5. 根据权利要求4所述的柔性元件，其中，所述金属为下列材料中的至少一种：形状记忆合金、弹簧钢、高硬度不锈钢、硬化铝及铝合金。
  6. 根据权利要求1所述的柔性元件，其中，所述波状为锯齿形或正弦波形。
  7. 根据权利要求1所述的柔性元件，其中，所述第一基层和第二基层由具有弯折回复性的柔性材料制成。
  8. 根据权利要求1所述的柔性元件，其中，所述第一基层和第二基层中分别开设有多个孔洞。
  9. 根据权利要求8所述的柔性元件，其中，所述多个孔洞在所述第一基层的曲率半径较大的弯折区域中的分布密度大于其在所述第一基层的曲率半径较小的弯折区域中的分布密度；且所述多个孔洞在所述第二基层的曲率半径较大的弯折区域中的分布密度大于其在所述第二基层的曲率半径较小的弯折区域中的分布密度。
  10. 根据权利要求8所述的柔性元件，其中，所述多个孔洞中每个孔洞的延伸方向和所述弯折轴线的方向相同。
  11. 根据权利要求1所述的柔性元件，其中，所述至少一个缓冲层为多个缓冲层，各相邻缓冲层之间由间隔基层隔开，所述间隔基层与 各缓冲层之间可通过粘结层进行粘结，且所述多个缓冲层在形状和/或尺寸上互不相同。
  12. 一种柔性显示设备，其包括：
    至少一个根据权利要求1-11中任一项所述的柔性元件；
    黏接层；以及
    柔性显示面板，
    其中，所述至少一个柔性元件的第一基层与所述柔性显示面板的非显示基板通过所述黏接层黏接在一起。
  13. 根据权利要求12所述的柔性显示设备，其中，所述黏接层为压敏胶。
  14. 根据权利要求13所述的柔性显示设备，其中，所述至少一个柔性元件为多个柔性元件，所述多个柔性元件相互叠置并黏合在一起。
  15. 一种柔性显示设备的制作方法，包括以下步骤：
    提供至少一个根据权利要求1-11中任一项所述的柔性元件；
    提供柔性显示面板；以及
    通过黏接层将所述至少一个柔性元件的第一基层与所述柔性显示面板的非显示基板黏接在一起，以形成柔性显示设备。
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