WO2019196657A1 - 柔性显示面板及其制备方法和显示装置 - Google Patents

柔性显示面板及其制备方法和显示装置 Download PDF

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Publication number
WO2019196657A1
WO2019196657A1 PCT/CN2019/079959 CN2019079959W WO2019196657A1 WO 2019196657 A1 WO2019196657 A1 WO 2019196657A1 CN 2019079959 W CN2019079959 W CN 2019079959W WO 2019196657 A1 WO2019196657 A1 WO 2019196657A1
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WIPO (PCT)
Prior art keywords
layer
display panel
flexible display
neutral
curved region
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PCT/CN2019/079959
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English (en)
French (fr)
Inventor
朱小研
谢昌翰
Original Assignee
京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US16/497,509 priority Critical patent/US11437593B2/en
Publication of WO2019196657A1 publication Critical patent/WO2019196657A1/zh

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    • 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
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    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable
    • 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
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    • B32B27/00—Layered products comprising a layer of synthetic resin
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    • B32B27/283—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 polysiloxanes
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    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
    • B32B37/182—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only one or more of the layers being plastic
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    • 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
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    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1641—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being formed by a plurality of foldable display components
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/844—Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • 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
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/72—Cured, e.g. vulcanised, cross-linked
    • 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • 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
    • B32B2307/546—Flexural strength; Flexion stiffness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
    • B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
    • B32B2310/0831—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation using UV radiation
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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
    • B32B2379/00—Other polymers having nitrogen, with or without oxygen or carbon only, in the main chain
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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
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    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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    • H10K2102/301—Details of OLEDs
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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
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    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a flexible display panel, a method of fabricating the same, and a display device.
  • a flexible display panel includes: a flexible substrate, and a thin film transistor layer, a light emitting layer, and an encapsulation layer, which are sequentially located on one side of the flexible substrate;
  • the flexible display panel includes: a curved region, and a neutral layer regulating layer on a side of the flexible substrate facing away from the light emitting layer;
  • the neutral layer adjustment layer is configured to adjust a neutral layer position of the first curved region to the encapsulation layer
  • the neutral layer adjusting layer is configured to adjust a neutral layer position of the second curved region to the thin film transistor layer
  • the first curved region is a region in which the flexible substrate can be bent away from the light emitting layer
  • the second curved region is a region in which the flexible substrate can be bent in a direction toward the light emitting layer.
  • the flexible display panel includes: the first curved region and the second curved region;
  • the neutral layer adjustment layer corresponding to the first curved region is a first neutral layer adjustment layer
  • the neutral layer adjustment layer corresponding to the second curved region is a second neutral layer adjustment layer
  • the first Young's modulus of the first neutral layer adjustment layer is smaller than the second Young's modulus of the second neutral layer adjustment layer.
  • the first thickness of the first neutral layer adjustment layer is smaller than the second thickness of the second neutral layer adjustment layer.
  • the first neutral layer adjustment layer and the second neutral layer adjustment layer are disposed in the same layer.
  • the material used for the flexible substrate comprises: a polyimide material
  • the material used for the neutral layer adjustment layer comprises: a polydimethylsiloxane material.
  • the present disclosure also provides a display device comprising the flexible display panel provided by any of the first aspects.
  • the present disclosure further provides a method for fabricating a flexible display panel according to any one of the first aspects, the method comprising:
  • the neutral layer adjustment layer is formed in a curved region of the flexible display panel.
  • the method when the flexible display panel includes the first curved region and the second curved region, the method includes:
  • a second neutral layer adjustment layer is formed on the flexible display panel at a position corresponding to the second curved region.
  • the first neutral layer adjustment layer and the second neutral layer adjustment layer are formed in the same layer.
  • the forming the neutral layer adjustment layer in the curved region of the flexible display panel comprises:
  • the back film is photocured by a mask to change the Young's modulus of the back film, and the neutral layer position of the flexible display panel corresponding to the position of the second bending region is adjusted to
  • the thin film transistor layer adjusts a neutral layer position of the flexible display panel corresponding to the position of the first curved region to the encapsulation layer.
  • the back film is photocured by ultraviolet irradiation.
  • the forming the neutral layer adjustment layer in the curved region of the flexible display panel comprises:
  • FIG. 1 is a schematic overall structural view of a flexible display panel according to an embodiment of the present disclosure
  • FIG. 2 is a schematic view showing the overall structure of the flexible display panel of FIG. 1 after being folded;
  • FIG. 3 is a cross-sectional structural view of the flexible display panel of FIG. 1 in the C-C direction;
  • FIG. 4 is a schematic structural view of the flexible display panel of FIG. 3 when bent;
  • FIG. 5 is a schematic structural view of a neutral layer position of the flexible display panel of FIG. 3;
  • FIG. 6 is a schematic cross-sectional view showing another structure of the flexible display panel of FIG. 1 in the C-C direction.
  • Embodiments of the present disclosure provide a flexible display panel, a preparation method thereof, and a display device, the display device including the above flexible display panel; the flexible display panel is provided with a neutral layer adjustment layer, which can reduce a thin film transistor of the flexible display panel during bending The stress on the layer and the encapsulation layer, thereby reducing the strain of the thin film transistor layer and the encapsulation layer after being stressed during the bending process, to prevent the thin film transistor layer and the encapsulation layer of the flexible display panel from being damaged due to the simultaneous failure to meet the tensile and compressive stresses. The phenomenon occurs.
  • a flexible display panel 1 includes a flexible substrate 11 , and a thin film transistor layer 12 , a light emitting layer 13 , and an encapsulation layer on the side of the flexible substrate 11 . 14;
  • the flexible display panel 1 includes: a curved region, including a neutral layer adjustment layer 15 on the side of the flexible substrate 11 facing away from the light-emitting layer 13;
  • the neutral layer adjusting layer 15 is configured to adjust the position of the neutral layer 18 of the first curved region A to the encapsulation layer 14;
  • the neutral layer adjusting layer 15 is configured to adjust the position of the neutral layer 18 of the second curved region B to the thin film transistor layer 12;
  • the first curved region A is a region in which the flexible substrate 11 can be bent away from the light-emitting layer 13
  • the second curved region B is a region in which the flexible substrate 1 can be bent in a direction toward the light-emitting layer 13 .
  • the flexible display panel 1 shown in the structure of FIG. 3 includes a flexible substrate 11 and a thin film transistor layer 12, a light emitting layer 13 and an encapsulation layer 14 which are sequentially formed on the flexible substrate 11, and the flexible display panel 1 may further include a package layer 14
  • the polarizer layer 16 and the protective layer 17 are provided with a back film forming the neutral layer regulating layer 15 on the side of the flexible substrate 11 facing away from the thin film transistor layer 12.
  • the flexible display panel 1 shown in the structure of FIG. 1 has a first curved area A and a second curved area B, and the first curved area A and the second curved area B are the structures of FIGS. 1, 4, 5, and 6, respectively.
  • the area enclosed by the dotted frame shown in the actual production process, the number and position of the specific bending area of the flexible display panel 1 can be set according to actual needs, and is not limited to only the first curved area A and the first in FIG.
  • the structure of the flexible display panel 1 of the two curved regions of the two curved regions B may be provided with only one first curved region A or one second curved region B, or one first curved region A and two
  • the second curved region B may further be provided with two first curved regions A and one second curved region B.
  • a plurality of first curved regions A and a plurality of The second bending area B, and the setting positions of the first bending area A and the second bending area B may also be configured according to actual needs.
  • the flexible display panel 1 shown in Fig. 1 is in a state before bending, and the flexible display panel 1 shown in the structure of Fig. 2 is in a folded state after being bent.
  • the flexible display panel may include: a first curved area A and a second curved area B;
  • the neutral layer adjustment layer 15 corresponding to the first curved region A is the first neutral layer adjustment layer 151
  • the neutral layer adjustment layer 154 corresponding to the second curved region B is the second neutral layer adjustment layer 152.
  • the neutral layer 18 is a surface (film layer) formed at all positions where the stress received during the bending of the flexible display panel 1 is zero, and is located in the flexible display as shown in FIGS. 4, 5, and 6.
  • the first axis O1 and the second axis O2 are both perpendicular to the page;
  • the flexible display panel 1 shown in the structure of FIG. 3 is a shape before the bending, and the flexible display panel 1 shown in the structure of FIG.
  • FIG. 4 is in the process of bending.
  • the flexible display panel 1 is located in the middle.
  • the regions below the layer 18 are pressed and compressive stress is generated, while the regions above the neutral layer 18 are pulled and tensile stress is generated;
  • the second curved region B is bent from the flexible substrate 11 toward the light-emitting layer 13. , called the inner bend, at this time, the flexible display panel 1 is located in neutral
  • the following 18 regions each tension, tensile stress, located above the neutral region layer 18 are pressed, compressive stress.
  • the neutral layer 18 is a surface (film layer) formed at all positions where the stress received during the bending of the flexible display panel 1 is zero; the flexible display panel 1 is provided for adjustment.
  • the neutral layer adjustment layer 15 at the position of the layer 18 is capable of causing the thin film transistor layer 12 and the encapsulation layer 14 of the curved region to be respectively located by the neutral layer adjustment layer 15 since the curved region of the flexible display panel 1 is bent in different directions.
  • Neutral layer 18 position as shown in the structure of FIG.
  • the neutral layer 18 is located in the encapsulation layer 14, in the second bending region B, the neutral layer 18 is located in the thin film transistor layer 12, Both the encapsulation layer 14 and the thin film transistor layer 12 are pressed. Since both the encapsulation layer 14 and the thin film transistor layer 12 can withstand compressive stress and cannot withstand tensile stress, the thin film transistor layer 12 and the flexible display panel 1 can be reduced during the bending process. The tensile stress applied to the encapsulation layer 14 further reduces the strain of the thin film transistor layer 12 and the encapsulation layer 14 after being stressed during the bending process to prevent the thin film transistor layer 12 and the encapsulation layer 14 of the flexible display panel 1 from being damaged. It can simultaneously meet the tensile and compressive stress and damage.
  • the flexible display panel 1 described above can solve the problem that the thin film transistor layer 12 and the encapsulation layer 14 of the conventional flexible display panel 1 cannot simultaneously satisfy the tensile and compressive stress requirements.
  • the first Young's modulus of the first neutral layer adjustment layer 151 is smaller than the second Young's modulus of the second neutral layer adjustment layer 152.
  • the first Young's modulus of the first neutral layer adjustment layer 151 is smaller than the second Young's modulus of the second neutral layer adjustment layer 152, the first Young's modulus of the first neutral layer adjustment layer 151 Smaller, the neutral layer 18 of the first curved region A is moved up, the neutral layer 18 is adjusted to the encapsulation layer 14 by adjusting the first Young's modulus, and the second neutral layer is 152.
  • the Young's modulus is large, the neutral layer position of the second curved region B is moved downward, and the position of the neutral layer 18 is adjusted to the thin film transistor layer 12 by adjusting the second Young's modulus, thereby making the flexible display panel 1 curved. In the process, the thin film transistor layer 12 and the encapsulation layer 14 can be pressed.
  • the first thickness h1 of the first neutral layer adjustment layer 151 is smaller than the second thickness h2 of the second neutral layer adjustment layer 152.
  • the first thickness of the first neutral layer adjustment layer 151 is smaller than the second thickness of the second neutral layer adjustment layer 152
  • the first thickness h1 of the first neutral layer adjustment layer 151 is smaller
  • the second neutral The second thickness h2 of the layer adjustment layer 152 is larger, so that the thickness of the first curved region A is smaller than the thickness of the second curved region B, and the difference between the first neutral layer adjustment layer 151 and the second neutral layer adjustment layer 152 is different.
  • the thickness adjusts the position of the neutral layer 18 of the first curved region A and the second curved region B.
  • the thin film transistor layer 12 and the encapsulation layer 14 are both in the pressed region to function as the thin film transistor layer 12 and the encapsulation layer 14.
  • the pressure resistance is not the advantage of pulling, and the service life and reliability of the flexible display panel 1 are improved.
  • the first neutral layer adjustment layer is disposed in the same layer as the second neutral layer adjustment layer.
  • the neutral layer adjustment layer 15 is a back film formed on the side of the flexible substrate 11 facing away from the light-emitting layer 13.
  • the flexible display panel 1 can configure the neutral layer adjustment layer 15 according to the bending condition, so that the thin film transistor layer 12 and the encapsulation layer 14 are always under pressure during the bending process, thereby improving the service life of the flexible display panel 1.
  • the flexible substrate 11 may be made of polyimide (PI) material or PET (polyethylene terephthalate), and the neutral layer is adjusted.
  • 15 can be made of polydimethylsiloxane material.
  • the embodiment of the present disclosure further provides a display device including any of the flexible display panels 1 as provided in the above embodiments.
  • the embodiment of the present disclosure further provides a method for preparing the flexible display panel 1 according to the foregoing embodiment, where the preparation method includes:
  • a flexible display panel 1 is prepared; as shown in the structure of FIG. 3, the flexible display panel 1 includes a flexible substrate 11 and a thin film transistor layer 12, a light-emitting layer 13, an encapsulation layer 14, a polarizer layer 16, and a protective layer which are sequentially formed on the flexible substrate 11. 17;
  • a neutral layer conditioning layer is formed in the curved region of the flexible display panel.
  • a position corresponding to the first curved area A on the flexible display panel 1 forms a neutral layer adjustment layer 15 configured to be the first curved area
  • the neutral layer position of A is adjusted to the encapsulation layer 14;
  • the neutral layer adjustment layer 15 is formed at a position corresponding to the second curved region B on the flexible display panel 1, and the neutral layer adjustment layer 15 is configured to be the second curved region
  • the neutral layer position of B is adjusted to the thin film transistor layer 12.
  • the method includes:
  • a second neutral layer adjustment layer 152 is formed at a position corresponding to the second curved region B on the flexible display panel.
  • the first neutral layer adjustment layer and the second neutral layer adjustment layer are formed in the same layer.
  • forming the neutral layer adjustment layer 15 in the curved region of the flexible display panel 1 includes:
  • a back film is attached to a surface of the flexible substrate 11 of the flexible display panel 1 facing away from the light-emitting layer 13;
  • the back film is photocured by a mask to change the Young's modulus of the back film, and the position of the neutral layer 18 of the flexible display panel 1 corresponding to the position of the second curved region B is adjusted.
  • the position of the neutral layer 18 of the flexible display panel 1 corresponding to the position of the first curved region A is adjusted to the encapsulation layer 14.
  • the manner of treating the back film is not limited to a light treatment method such as photo-curing, and any method of changing the Young's modulus of the back film is in the embodiment of the present disclosure. Within the scope of protection.
  • the back film may be photocured by ultraviolet irradiation, or the back film may be treated by other processing methods to make the back film of the Young's die.
  • the amount is different, and the first Young's modulus of the first neutral layer adjustment layer 151 is smaller than the second Young's modulus of the second neutral layer adjustment layer 152.
  • the position of the neutral layer 18 of the flexible display panel 1 is adjusted by the difference in Young's modulus of the back film, so that the thin film transistor layer 12 and the encapsulation layer 14 are always at the neutral layer 18 of the flexible display panel 1 during the bending process. Has been under pressure.
  • the neutral layer adjustment layer 15 is formed in the curved region of the flexible display panel 1, and specifically includes:
  • the thickness of the back film is made different by the cutting process for the back film, and the first thickness h1 of the first neutral layer regulating layer 151 is made smaller than the second thickness h2 of the second neutral layer adjusting layer 152.
  • the position of the neutral layer 18 of the flexible display panel 1 is adjusted by the difference in thickness of the back film, so that the thin film transistor layer 12 and the encapsulation layer 14 are always at the neutral layer 18 of the flexible display panel 1 during the bending process, and are always under pressure. status.

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Abstract

一种柔性显示面板及其制备方法和显示装置。柔性显示面板（1）包括：柔性基板（11），以及依次位于柔性基板（11）一侧的薄膜晶体管层（12）、发光层（13）和封装层（14）；该柔性显示面板（1）包括：弯曲区域，在弯曲区域内包括位于柔性基板（11）背离发光层（13）一侧的中性层调节层（15）；当弯曲区域为第一弯曲区域（A）时，中性层调节层（15）被配置为将第一弯曲区域（A）的中性层（18）位置调节至封装层（14）；当弯曲区域为第二弯曲区域（B）时，中性层调节层（15）被配置为将第二弯曲区域（B）的中性层（18）位置调节至薄膜晶体管层（12）；其中，第一弯曲区域（A）为柔性基板（11）能够向背离发光层（13）的方向弯曲的区域，第二弯曲区域（B）为柔性基板（11）能够向朝向发光层（13）的方向弯曲的区域。通过上述设置能够使柔性显示面板（1）的薄膜晶体管层（12）和封装层（14）满足拉、压应力的需求。

Description

柔性显示面板及其制备方法和显示装置
本公开要求在2018年04月12日提交中国专利局、公开号为201810325012.X、公开名称为“一种柔性显示面板及其制备方法和显示装置”的中国专利公开的优先权，其全部内容以引入的方式并入本公开中。
技术领域
本公开涉及显示技术领域，特别涉及柔性显示面板及其制备方法和显示装置。
背景技术
随着显示技术的快速发展，能够进行折叠的柔性显示面板已经成为显示领域的研发热点。当柔性显示面板为多折叠产品时，柔性显示面板的薄膜晶体管层和封装层需要同时面对较为苛刻的弯曲条件。
发明内容
第一方面，本公开实施例提供的柔性显示面板，包括：柔性基板，以及依次位于所述柔性基板一侧的薄膜晶体管层、发光层和封装层；
所述柔性显示面板包括：弯曲区域，在所述弯曲区域内包括位于所述柔性基板背离所述发光层一侧的中性层调节层；
当所述弯曲区域为第一弯曲区域时，所述中性层调节层被配置为将所述第一弯曲区域的中性层位置调节至所述封装层；
当所述弯曲区域为第二弯曲区域时，所述中性层调节层被配置为将所述第二弯曲区域的中性层位置调节至所述薄膜晶体管层；
其中，所述第一弯曲区域为所述柔性基板能够向背离所述发光层的方向弯曲的区域，所述第二弯曲区域为所述柔性基板能够向朝向所述发光层的方向弯曲的区域。
可选地，在本公开实施例提供的柔性显示面板中，所述柔性显示面板包括：所述第一弯曲区域和所述第二弯曲区域；
其中，所述第一弯曲区域对应的所述中性层调节层为第一中性层调节层，所述第二弯曲区域对应的所述中性层调节层为第二中性层调节层。
可选地，在本公开实施例提供的柔性显示面板中，所述第一中性层调节层的第一杨氏模量小于所述第二中性层调节层的第二杨氏模量。
可选地，在本公开实施例提供的柔性显示面板中，所述第一中性层调节层的第一厚度小于所述第二中性层调节层的第二厚度。
可选地，在本公开实施例提供的柔性显示面板中，所述第一中性层调节层和所述第二中性层调节层同层设置。
可选地，在本公开实施例提供的柔性显示面板中，所述柔性基板采用的材料包括：聚酰亚胺材料；
所述中性层调节层采用的材料包括：聚二甲基硅氧烷材料。
第二方面，本公开还提供了显示装置，该显示装置包括第一方面中任一实施例提供的柔性显示面板。
第三方面，本公开还提供了如第一方面任一实施例提供的柔性显示面板的制备方法，该制备方法包括：
制备所述柔性显示面板；
在所述柔性显示面板的弯曲区域内形成所述中性层调节层。
可选地，在本公开实施例提供的柔性显示面板的制备方法中，所述柔性显示面板包括所述第一弯曲区域和所述第二弯曲区域时，所述方法包括：
在所述柔性显示面板上与所述第一弯曲区域对应的位置形成第一中性层调节层；
在所述柔性显示面板上与所述第二弯曲区域对应的位置形成第二中性层调节层。
可选地，在本公开实施例提供的柔性显示面板的制备方法中，在同一层形成所述第一中性层调节层与所述第二中性层调节层。
可选地，在本公开实施例提供的柔性显示面板的制备方法中，在所述柔性显示面板的弯曲区域内形成所述中性层调节层，具体包括：
在所述柔性显示面板的所述柔性基板背离所述发光层的一侧表面贴合背膜；
通过掩膜板对所述背膜进行光固化处理，以改变所述背膜的杨氏模量，使与所述第二弯曲区域位置相对应的所述柔性显示面板的中性层位置调节至所述薄膜晶体管层，且使与所述第一弯曲区域位置相对应的所述柔性显示面板的中性层位置调节至所述封装层。
可选地，在本公开实施例提供的柔性显示面板的制备方法中，通过掩膜板对所述背膜进行光固化处理过程中，所述背膜通过紫外线照射进行光固化处理。
可选地，在本公开实施例提供的柔性显示面板的制备方法中，在所述柔性显示面板的弯曲区域内形成所述中性层调节层，具体包括：
在所述柔性显示面板的所述柔性基板背离所述发光层的一侧表面贴合背膜；
切割所述背膜，以调节所述背膜的厚度，使与所述第二弯曲区域位置相对应的所述柔性显示面板的中性层位置调节至所述薄膜晶体管层，且使与所述第一弯曲区域位置相对应的所述柔性显示面板的中性层位置调节至所述封装层。
附图说明
图1为本公开实施例提供的柔性显示面板的整体结构示意图；
图2为图1中柔性显示面板在折叠后的整体结构示意图；
图3为图1中柔性显示面板在C-C向的一种剖视结构示意图；
图4为图3中柔性显示面板弯曲时的结构示意图；
图5为图3中柔性显示面板的中性层位置的结构示意图；
图6为图1中柔性显示面板在C-C向的另一种剖视结构示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通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例，都属于本公开保护的范围。
本公开实施例提供了柔性显示面板及其制备方法和显示装置，该显示装置包括上述柔性显示面板；该柔性显示面板设置有中性层调节层，能够减小柔性显示面板在弯曲过程中薄膜晶体管层和封装层所受到的应力，进而减小薄膜晶体管层和封装层在弯曲过程中受到应力后的应变，以防止柔性显示面板的薄膜晶体管层和封装层因不能同时满足拉、压应力而损坏的现象发生。
其中，请参考图1、图2以及图3，本公开实施例提供的柔性显示面板1，包括柔性基板11，以及依次位于该柔性基板11一侧的薄膜晶体管层12、发光层13和封装层14；
柔性显示面板1包括：弯曲区域，在弯曲区域内包括位于柔性基板11背离发光层13一侧的中性层调节层15；
如图4所示，当该弯曲区域为第一弯曲区域A时，该中性层调节层15被配置为将第一弯曲区域A的中性层18的位置调节至封装层14；
当该弯曲区域为第二弯曲区域B时，该中性层调节层15被配置为将第二弯曲区域B的中性层18的位置调节至薄膜晶体管层12；
其中，第一弯曲区域A为柔性基板11能够向背离发光层13的方向弯曲的区域，第二弯曲区域B为柔性基板1能够向朝向发光层13的方向弯曲的区域。
如图3结构所示的柔性显示面板1包括柔性基板11以及依次形成于柔性基板11上的薄膜晶体管层12、发光层13和封装层14，柔性显示面板1还可以包括形成于封装层14上的偏光片层16和保护层17，并且在柔性基板11背离薄膜晶体管层12的一侧设置有形成中性层调节层15的背膜。
图1中结构所示的柔性显示面板1具有第一弯曲区域A和第二弯曲区域B，第一弯曲区域A和第二弯曲区域B分别为图1、图4、图5以及图6中结构所示的虚线框所围成的区域，在实际生产过程中，柔性显示面板1的具体弯曲区域数量和位置可以根据实际需要进行设置，不限于图1中的只具有第一弯曲区域A和第二弯曲区域B两个弯曲区域的柔性显示面板1结构，例如：柔性显示面板1可以只设置一个第一弯曲区域A或一个第二弯曲区域B，也可以设置一个第一弯曲区域A和两个第二弯曲区域B，还可以设置两个第一弯曲区域A和一个第二弯曲区域B，当柔性显示面板1需要进行多次折叠结构时，还可以设置多个第一弯曲区域A和多个第二弯曲区域B，并且第一弯曲区域A和第二弯曲区域B的设置位置也可以根据实际需要进行配置。图1中所示的柔性显示面板1为弯曲之前的状态，图2结构所示的柔性显示面板1为经过弯曲之后的折叠状态。
可选地，在本公开实施例提供的柔性显示面板中，如图5和图6所示，该柔性显示面板可以包括：第一弯曲区域A和第二弯曲区域B；
其中，第一弯曲区域A对应的中性层调节层15为第一中性层调节层151，第二弯曲区域B对应的中性层调节层154为第二中性层调节层152。
在本公开实施例中，中性层18为在柔性显示面板1的弯曲过程中受到的应力为零的所有位置形成的面(膜层)，如图4、图5以及图6中位于柔性显示面板1内部的虚线所示的中性层18位置；在图1中，第一弯曲区域A的弯曲轴线为第一轴O1，第二弯曲区域B的弯曲轴线为第二轴O2，在图4结构中，第一轴O1和第二轴O2均与页面垂直；如图3结构所示的柔性显示面板1为未弯曲之前的形状，图4结构所示的柔性显示面板1为弯曲过程中的柔性显示面板1的具体结构图；在图4结构中，第一弯曲区域A为从柔性基板11向背离发光层13的方向弯曲，称之为外弯，此时，柔性显示面板1中位于中性层18以下的区域均受压，并产生压应力，而位于中性层18以上的区域均受拉，并产生拉应力；第二弯曲区域B为从柔性基板11朝向发光层13的方向弯曲，称之为内弯，此时，柔性显示面板1中位于中性层18以下的区域均 受拉，产生拉应力，而位于中性层18以上的区域均受压，产生压应力。
本公开实施例中，上述所说的中性层18即为在柔性显示面板1弯曲过程中受到的应力为零的所有位置形成的面(膜层)；上述柔性显示面板1设置有用于调节中性层18位置的中性层调节层15，由于在柔性显示面板1的弯曲区域在朝向不同方向弯曲时，通过中性层调节层15能够使弯曲区域的薄膜晶体管层12和封装层14分别位于中性层18位置，如图4结构所示，在第一弯曲区域A中，中性层18位于封装层14内，在第二弯曲区域B中，中性层18位于薄膜晶体管层12内，封装层14和薄膜晶体管层12均受压，由于封装层14和薄膜晶体管层12均能承受压应力而不能承受拉应力，因此，能够减小柔性显示面板1在弯曲过程中薄膜晶体管层12和封装层14所受到的拉应力，进而减小薄膜晶体管层12和封装层14在弯曲过程中受到应力后的应变，以防止柔性显示面板1的薄膜晶体管层12和封装层14因不能同时满足拉、压应力而损坏的现象发生。
因此，上述柔性显示面板1能够解决现有柔性显示面板1的薄膜晶体管层12和封装层14不能同时满足拉、压应力需求的问题。
通过中性层调节层15调节柔性显示面板1的弯曲区域的中性层18位置，可以采用以下两种实施方式：
方式一，如图5结构所示，第一中性层调节层151的第一杨氏模量小于第二中性层调节层152的第二杨氏模量。
由于第一中性层调节层151的第一杨氏模量小于第二中性层调节层152的第二杨氏模量，因此，第一中性层调节层151的第一杨氏模量较小，使第一弯曲区域A的中性层18位置上移，通过调节第一杨氏模量将中性层18位置调节至封装层14；而第二中性层调节层152的第二杨氏模量较大，使第二弯曲区域B的中性层位置下移，通过调节第二杨氏模量将中性层18位置调节至薄膜晶体管层12，进而使柔性显示面板1在弯曲过程中，均能够使薄膜晶体管层12和封装层14受压。
方式二，如图6结构所示，第一中性层调节层151的第一厚度h1小于第 二中性层调节层152的第二厚度h2。
由于第一中性层调节层151的第一厚度小于第二中性层调节层152的第二厚度，因此，第一中性层调节层151的第一厚度h1较小，而第二中性层调节层152的第二厚度h2较大，进而使第一弯曲区域A的厚度小于第二弯曲区域B的厚度，通过第一中性层调节层151和第二中性层调节层152的不同厚度，进而调节第一弯曲区域A和第二弯曲区域B的中性层18位置，同理，使薄膜晶体管层12和封装层14均处于受压区域，以发挥薄膜晶体管层12和封装层14耐压而不耐拉的优势，提高柔性显示面板1的使用寿命和可靠性。
可选地，在本公开实施例提供的柔性显示面板中，该第一中性层调节层与第二中性层调节层同层设置。
如图5和图6结构所示，该中性层调节层15为形成于柔性基板11背离发光层13一侧的背膜。
由于中性层调节层15具有第一中性层调节层151和第二中性层调节层152，并且第一中性层调节层151和第二中性层调节层152分别对应不同的弯曲区域，因此，柔性显示面板1能够根据弯曲情况配置中性层调节层15，使薄膜晶体管层12和封装层14在弯曲过程中始终处于受压状态，进而提高柔性显示面板1的使用寿命。
在上述各种实施例的基础上，柔性基板11可以采用聚酰亚胺(Polyimide，PI)材料或PET(Polyethylene terephthalate，聚对苯二甲酸乙二醇酯)制成、且中性层调节层15可以采用聚二甲基硅氧烷材料制成。
本公开实施例还提供了一种显示装置，该显示装置包括如上述实施例提供的任意一种柔性显示面板1。
另外，本公开实施例还提供了一种如上述实施例提供的任意一种柔性显示面板1的制备方法，该制备方法包括：
制备柔性显示面板1；如图3结构所示，柔性显示面板1包括柔性基板11以及依次形成于柔性基板11上的薄膜晶体管层12、发光层13、封装层14、偏光片层16和保护层17；
在柔性显示面板的弯曲区域内形成中性层调节层。
当柔性显示面板1具有第一弯曲区域A时，在柔性显示面板1上与第一弯曲区域A对应的位置形成中性层调节层15，中性层调节层15被配置为将第一弯曲区域A的中性层位置调节至封装层14；
当柔性显示面板1具有第二弯曲区域B时，在柔性显示面板1上与第二弯曲区域B对应的位置形成中性层调节层15，中性层调节层15被配置为将第二弯曲区域B的中性层位置调节至薄膜晶体管层12。
可选地，在本公开实施例提供的柔性显示面板的制备方法中，如图5和图6所示，柔性显示面板包括第一弯曲区域A和第二弯曲区域B时，方法包括：
在柔性显示面板上与第一弯曲区域A对应的位置形成第一中性层调节层151；
在柔性显示面板上与第二弯曲区域B对应的位置形成第二中性层调节层152。
可选地，在本公开实施例提供的柔性显示面板的制备方法中，在同一层形成第一中性层调节层与第二中性层调节层。
可选地，在本公开实施例提供的柔性显示面板的制备方法中，如图5所示，在柔性显示面板1的弯曲区域内形成中性层调节层15，具体包括：
如图3结构所示，在柔性显示面板1的柔性基板11背离发光层13的一侧表面贴合背膜；
如图5所示，通过掩膜板对背膜进行光固化处理，以改变背膜的杨氏模量，使与第二弯曲区域B位置相对应的柔性显示面板1的中性层18位置调节至薄膜晶体管层12，且使与第一弯曲区域A位置相对应的柔性显示面板1的中性层18位置调节至封装层14。
在通过光固化处理改变背膜的杨氏模量的过程中，处理背膜的方式不限于光固化等光处理方式，任何可以改变背膜的杨氏模量的方法都在本公开实施例的保护范围内。
具体地，在通过掩膜板对背膜进行光固化处理过程中，背膜可以通过紫外线照射进行光固化处理，也可以通过其它的处理方法对背膜进行处理，以使背膜的杨氏模量不同，并且第一中性层调节层151的第一杨氏模量小于第二中性层调节层152的第二杨氏模量。通过背膜的杨氏模量的不同，来调节柔性显示面板1的中性层18位置，使薄膜晶体管层12和封装层14在弯曲过程中始终处于柔性显示面板1的中性层18位置，一直处于受压状态。
可选地，在本公开实施例提供的柔性显示面板的制备方法中，如图6所示，在柔性显示面板1的弯曲区域内形成中性层调节层15，具体包括：
在柔性显示面板1的柔性基板11背离发光层13的一侧表面贴合背膜；
切割背膜，以调节背膜的厚度，使与第二弯曲区域B位置相对应的柔性显示面板1的中性层18位置调节至薄膜晶体管层12，且使与第一弯曲区域A位置相对应的柔性显示面板1的中性层18位置调节至封装层14。
在通过对背膜的切割工序，使背膜的厚度不同，并且使第一中性层调节层151的第一厚度h1小于第二中性层调节层152的第二厚度h2。通过背膜厚度的不同，来调节柔性显示面板1的中性层18位置，使薄膜晶体管层12和封装层14在弯曲过程中始终处于柔性显示面板1的中性层18位置，一直处于受压状态。
显然，本领域的技术人员可以对本公开实施例进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (14)

  1. 一种柔性显示面板，其中，包括：柔性基板，以及依次位于所述柔性基板一侧的薄膜晶体管层、发光层和封装层；
    所述柔性显示面板包括：弯曲区域，在所述弯曲区域内包括位于所述柔性基板背离所述发光层一侧的中性层调节层；
    当所述弯曲区域为第一弯曲区域时，所述中性层调节层被配置为将所述第一弯曲区域的中性层位置调节至所述封装层；
    当所述弯曲区域为第二弯曲区域时，所述中性层调节层被配置为将所述第二弯曲区域的中性层位置调节至所述薄膜晶体管层；
    其中，所述第一弯曲区域为所述柔性基板能够向背离所述发光层的方向弯曲的区域，所述第二弯曲区域为所述柔性基板能够向朝向所述发光层的方向弯曲的区域。
  2. 根据权利要求1所述的柔性显示面板，其中，所述柔性显示面板包括：所述第一弯曲区域和所述第二弯曲区域；
    其中，所述第一弯曲区域对应的所述中性层调节层为第一中性层调节层，所述第二弯曲区域对应的所述中性层调节层为第二中性层调节层。
  3. 根据权利要求2所述的柔性显示面板，其中，所述第一中性层调节层的第一杨氏模量小于所述第二中性层调节层的第二杨氏模量。
  4. 根据权利要求2所述的柔性显示面板，其中，所述第一中性层调节层的第一厚度小于所述第二中性层调节层的第二厚度。
  5. 根据权利要求2所述的柔性显示面板，其中，所述第一中性层调节层和所述第二中性层调节层同层设置。
  6. 根据权利要求1所述的柔性显示面板，其中，所述中性层调节层为形成于所述柔性基板背离所述发光层一侧的背膜。
  7. 根据权利要求1-6任一项所述的柔性显示面板，其中，所述柔性基板采用的材料包括：聚酰亚胺材料；
    所述中性层调节层采用的材料包括：聚二甲基硅氧烷材料。
  8. 一种显示装置，其中，包括如权利要求1-7任意一项所述的柔性显示面板。
  9. 根据权利要求1-7任一项所述柔性显示面板的制备方法，其中，包括：
    制备所述柔性显示面板；
    在所述柔性显示面板的弯曲区域内形成所述中性层调节层。
  10. 根据权利要求9所述的制备方法，其中，所述柔性显示面板包括所述第一弯曲区域和所述第二弯曲区域时，所述方法包括：
    在所述柔性显示面板上与所述第一弯曲区域对应的位置形成第一中性层调节层；
    在所述柔性显示面板上与所述第二弯曲区域对应的位置形成第二中性层调节层。
  11. 根据权利要求10所述的制备方法，其中，在同一层形成所述第一中性层调节层与所述第二中性层调节层。
  12. 根据权利要求11所述的制备方法，其中，在所述柔性显示面板的弯曲区域内形成所述中性层调节层，具体包括：
    在所述柔性显示面板的所述柔性基板背离所述发光层的一侧表面贴合背膜；
    通过掩膜板对所述背膜进行光固化处理，以改变所述背膜的杨氏模量，使与所述第二弯曲区域位置相对应的所述柔性显示面板的中性层位置调节至所述薄膜晶体管层，且使与所述第一弯曲区域位置相对应的所述柔性显示面板的中性层位置调节至所述封装层。
  13. 根据权利要求12所述的制备方法，其中，通过掩膜板对所述背膜进行光固化处理过程中，所述背膜通过紫外线照射进行光固化处理。
  14. 根据权利要求11所述的制备方法，其中，在所述柔性显示面板的弯曲区域内形成所述中性层调节层，具体包括：
    在所述柔性显示面板的所述柔性基板背离所述发光层的一侧表面贴合背 膜；
    切割所述背膜，以调节所述背膜的厚度，使与所述第二弯曲区域位置相对应的所述柔性显示面板的中性层位置调节至所述薄膜晶体管层，且使与所述第一弯曲区域位置相对应的所述柔性显示面板的中性层位置调节至所述封装层。
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