WO2019228088A1 - 柔性显示装置 - Google Patents

柔性显示装置 Download PDF

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Publication number
WO2019228088A1
WO2019228088A1 PCT/CN2019/082758 CN2019082758W WO2019228088A1 WO 2019228088 A1 WO2019228088 A1 WO 2019228088A1 CN 2019082758 W CN2019082758 W CN 2019082758W WO 2019228088 A1 WO2019228088 A1 WO 2019228088A1
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Prior art keywords
flexible
electrode layer
conversion
display device
flexible substrate
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PCT/CN2019/082758
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English (en)
French (fr)
Inventor
徐朝哲
高志扬
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京东方科技集团股份有限公司
合肥京东方光电科技有限公司
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Priority to US16/642,048 priority Critical patent/US11348486B2/en
Publication of WO2019228088A1 publication Critical patent/WO2019228088A1/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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • 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
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/40—Thermal treatment, e.g. annealing in the presence of a solvent vapour
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a flexible display device.
  • Flexible display devices are flexible display devices made of flexible materials. Due to their outstanding display characteristics such as flexibility and lightness, flexible display devices can be applied to wearable devices, mobile devices, augmented reality and virtual technology devices. Many other fields are considered to be the mainstream of future display fields.
  • the flexible display device is usually made into a structure that can be folded or folded in a non-operation state and expanded during operation.
  • the substrate material of the flexible display device is susceptible to damage during the artificial curling / folding process, and irreversible deformation may also occur after long-term folding / curling storage, leading to the problem of creasing or warping.
  • the above problems will cause problems such as unevenness after the substrate material is unfolded, and affect the display effect of the display.
  • the unevenness of the substrate will also affect the working characteristics and life of the internal structure of the display, reducing the reliability of the display.
  • the present disclosure provides a flexible display device.
  • the specific scheme is as follows:
  • a flexible display device includes:
  • the flexible and rigid conversion layer includes: an electrode layer and a conversion film capable of performing flexible and rigid conversion under an electric field; the electrode layer is used to form an electric field that drives the conversion film to perform flexible and rigid conversion.
  • the present disclosure provides a flexible display device.
  • the flexible display device includes a flexible substrate and a flexible rigid conversion layer formed on one side of the flexible substrate.
  • the flexible rigid conversion layer includes a conversion film and an electrode layer. Specifically, after the electrode layer generates an electric field for converting the conversion film from flexible to rigid, the conversion film stretches in a direction perpendicular to the electric field, the elastic modulus changes, the film layer stretches and spreads, and because the flexible rigid conversion layer is formed on the flexible Substrate, the flexible substrate will also be tiled accordingly, which can play a role in flattening the flexible substrate; In addition, the conversion film in the electric field can be converted from rigid to flexible by adjusting the electrode layer.
  • the substrate loses its support, so that it can meet the user's curling or bending needs for the flexible display device.
  • the conversion film can switch elastic parameters under the action of an electric field, and switch from a flexible layer to a rigid layer, thereby realizing the flattening of the flexible substrate.
  • the conversion of the conversion film can also reduce the flexible substrate's repeated curling and unfolding processes. Damage, thereby extending the life of the display device and improving the display quality.
  • FIG. 1 is a structural diagram of a flexible display device provided by an embodiment of the present disclosure
  • FIG. 2 is another structural diagram of a flexible display device provided by an embodiment of the present disclosure.
  • FIG. 3 is a schematic structural diagram of Structure 1 provided by an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of Structure 2 provided by an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of Form Three in the embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of Form 4 in the embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of another display device according to an embodiment of the present disclosure.
  • FIG. 9 is another schematic structural diagram of a display device according to an embodiment of the present disclosure.
  • FIG. 10 is a flowchart of a flexible display device according to an embodiment of the present disclosure.
  • the present disclosure provides a flexible display device, as shown in FIG. 1, including:
  • the flexible and rigid conversion layer 2 includes: an electrode layer 22 and a conversion film 21 capable of performing flexible and rigid conversion under an electric field; the electrode layer 22 is used to form an electric field that drives the conversion film 21 to perform flexible and rigid conversion.
  • the present disclosure provides a flexible display device.
  • the flexible display device includes a flexible substrate 1 and a flexible rigid conversion layer 2 formed on one side of the flexible substrate 1.
  • the flexible rigid conversion layer 2 includes a conversion film 21 and an electrode layer 22.
  • the electrode layer 22 generates an electric field for converting the conversion film 21 from flexible to rigid
  • the conversion film 21 stretches in a direction perpendicular to the electric field
  • the elastic modulus changes
  • the film layer stretches and flattens
  • due to the flexible rigid conversion layer 2 is formed on the flexible substrate 1
  • the flexible substrate 1 will also be tiled accordingly, which can play a role in planarizing the flexible substrate 1.
  • the conversion film in the electric field can be adjusted by adjusting the electrode layer 22 21 is changed from rigid to flexible.
  • the flexible substrate 1 loses support, so that the user's curling or bending needs for the flexible display device can be met.
  • the conversion film 21 in the flexible display device provided by the present disclosure can switch elastic parameters under the action of an electric field, and switch from a flexible layer to a rigid layer, thereby achieving flatness of the flexible substrate 1, and the flexibility can also be reduced by the conversion of the conversion film 21
  • the substrate 1 is damaged during repeated curling and unfolding processes, thereby extending the life of the display device and improving the display quality.
  • the display device can extend the life of the flexible substrate 1, improve the display effect of the display device, and improve the reliability of the display device.
  • the flexible substrate 1 is provided with a display component 3, and the display component 3 may be an organic light emitting display device or a flexible liquid crystal display device.
  • the display component 3 may include a thin film transistor switch 31, a light emitting layer 32, an encapsulation layer 33, and a protective layer 34 which are sequentially disposed in a direction away from the flexible substrate 1.
  • the display component 3 may further be provided with a device for controlling the normal display function of the display component 3.
  • the control chip is not specifically limited herein.
  • the flexible rigid conversion layer 2 can be located between the flexible substrate 1 and the display component 3, or the flexible rigid conversion layer 2 is located on the side of the display component 3 facing away from the flexible substrate 1, or the flexible rigid conversion layer 2
  • the flexible substrate 1 is located on the side facing away from the display component 3.
  • the flexible rigid conversion layer 2 is selected on the side of the flexible substrate 1 facing away from the display component 3.
  • the flexible substrate 1 may use an organic or inorganic flexible material, and specifically, may be polyimide, polyethylene naphthalate, polyparaphenylene Diethylene glycol dicarboxylate, metal film, or other bendable substrate materials are not specifically limited herein.
  • the conversion film 21 in the flexible rigid conversion layer 2 may be made of a dielectric elastic material, and an elastic parameter change may occur when the power is applied, and the flexibility is converted to rigidity.
  • the preparation material of the conversion film 21 may be selected from polymer materials such as silicone rubber, acrylate materials, and carbon nanotube materials. In the actual preparation process, screen printing, surface coating, and digital printing may be used. The precursor material is coated and cured into a film by thermal curing or ultraviolet curing.
  • the manufacturing difficulty of the flexible display device provided by the present disclosure can be reduced and the production efficiency can be improved.
  • the preparation material of the electrode layer 22 may be a non-metallic conductive material, such as indium tin oxide, aluminum-doped zinc oxide, or other non-metallic conductive material, and when this kind of material is used, it can be sprayed, evaporated, etc.
  • the film is formed by plating or the like, or the material for preparing the electrode layer 22 may be a metal conductive material, such as Au, Ag, Cu, Fe, etc., and when this material is used, the film is formed by evaporation or the like.
  • the conversion film 21 includes a plurality of conversion units.
  • the plurality of conversion units are arranged along a rollable direction of the flexible substrate 1, and the conversion units are insulated from each other.
  • a plurality of conversion units realize the regionalization control of the planarization of the flexible substrate 1.
  • Each conversion unit can control the planarization of a part of the flexible substrate 1 corresponding to itself.
  • the interval size is determined by the insulation characteristics of the insulating material, and is not limited here.
  • the conversion film 21 includes a plurality of conversion units, there are multiple possibilities for setting the electrode layer 22, at least one of the following two types:
  • the electrode layer 22 includes a first electrode layer 221 and a second electrode layer 222.
  • the first electrode layer 221 includes a plurality of first electrode units corresponding to one-to-one conversion units. Between an electrode unit and the second electrode layer 222.
  • the first electrode layer may be an anode layer, and the second electrode layer is a cathode layer; or, the first electrode layer is a cathode layer, and the second electrode layer is an anode layer.
  • the first electrode unit is located on the side of the conversion unit facing away from the flexible substrate 1
  • the second electrode layer 222 is located on the side of the conversion film 21 facing the flexible substrate 1.
  • the conversion film 21 includes a conversion unit.
  • the conversion film 21 includes only one conversion unit, that is, the entire conversion film 21 is laid on one side of the flexible substrate 1 to achieve a planarization effect on the flexible substrate 1.
  • the conversion film 21 includes a conversion unit
  • the electrode layer 22 includes a first electrode layer 221 and a second electrode layer 222.
  • the first electrode layer 221 and the second electrode layer 222 are respectively located on two sides of the conversion film 21.
  • the electrode layer 22 includes a first electrode layer 221 and a second electrode layer 222, the first electrode layer 221 and the second electrode layer 222 are located on the same side of the conversion film 21, and the first electrode layer 221 includes The plurality of first electrode units and the second electrode layer 222 include a plurality of second electrode units, and the plurality of second electrode units and the plurality of first electrode units are spaced apart and alternately disposed on the same layer.
  • the first electrode layer 221 and the second electrode layer 222 may be formed by etching or coating.
  • the flexible rigid conversion layer 2 further includes a flat layer 23 for increasing flatness, and the flat layer 23 is located at the conversion
  • the side of the thin film 21 and the electrode layer 22 facing away from the flexible substrate 1 is shown in FIG. 4, FIG. 6 and FIG. 7, for example.
  • the flat layer 23 is located in each of the film layers in the flexible rigid conversion layer 2 with the flexible substrate 1 as an inner side as a reference. Outermost.
  • an inorganic thin film such as silicon nitride or other organic film layers having a protective effect may be used, and a specific preparation method may use a plasma enhanced chemical vapor deposition method, an atomic layer deposition method, or other methods.
  • the flexible rigid conversion layer 2 may further include a control module 24 for outputting signals required for conversion of the conversion film 21 between flexibility and rigidity.
  • the electrical signals output by the control module 24 can be transmitted to the electrode layer 22 through electrical wiring and applied to the electrode layer 22.
  • the conversion film 21 please refer to FIGS. 8 and 9.
  • the electric signal output by the control module 24 may be a pulse signal.
  • the electrode layer 22 generates an electric field after receiving the pulse voltage signal of the control module 24, and the conversion film 21 is stretched in a direction perpendicular to the electric field. The elastic modulus is changed, and the film layer is stretched and tiled. At this time, since the conversion film 21 and the flexible substrate 1 are adhered together, the flexible substrate 1 is also tiled accordingly, and the flexible substrate 1 is flattened.
  • the conversion film 21 can remain rigid for a certain period of time after the electrical signal is applied, until the next pulse voltage is applied, and the interval time of applying the pulse voltage must be less than or equal to the rigid retention time of the conversion layer, and the specific interval time And the voltage amplitude needs to be comprehensively formulated according to the material structure and doping conditions.
  • control module 24 may also be integrated in the control system of the flexible display device or the control chip of the display component 3 provided in the present disclosure.
  • the flexible display device provided by the present disclosure further includes a fixed shaft located at one end of the flexible substrate 1.
  • the flexible substrate 1 has an unfolded state and a rolled state with the fixed axis as a reel.
  • the fixed axis is a cylindrical structure
  • the display component 3 is located on the side of the flexible substrate 1 facing the fixed axis.
  • the flexible substrate 1 needs to be curled relative to the fixed axis, the flexible substrate 1 and the flexible substrate 1
  • the display element 3 and the flexible rigid conversion layer 2 are rolled at the center point of the fixed axis.
  • the flexible display device provided by the present disclosure further includes a curling device for controlling the flexible substrate 1 to switch between the unfolded state and the curled state, and a driving system for driving the action of the curling device.
  • the curling device and the driving system are located on a fixed shaft, and the driving system may be an air compression system or other mobile power system.
  • a fixed axis control system for controlling the operation of the drive system can also be provided in the fixed axis.
  • the fixed axis control system can include control circuits and mobile control panels.
  • the user can adjust the flexible substrate 1 and display components through the fixed axis control system.
  • the display composed of 3 and flexible rigid conversion layer 2 performs curling, opening, and projection operations, and adjusts the actual display size and resolution of the display.
  • the user can also roll up the display around the fixed axis by manual curling.
  • the length and radius of the fixed shaft may be fixed, or the size of the fixed shaft may be adjustable in the radial direction; and / or, the size of the fixed shaft may be adjustable in the extending direction of the fixed shaft.
  • the size adjustment of the fixed shaft can be set manually or controlled by the fixed shaft telescopic device, and the specific diameter and length of the fixed shaft are determined according to the minimum curvature radius of the display and the working size of the display, and the drive system can be Variations in the length and radius of the fixed shaft and the curling / opening of the display provide power.
  • the conversion film 21 includes a plurality of conversion units, along the rollable direction of the flexible substrate 1, the length of each conversion unit is less than or equal to eight of the minimum circumference of the fixed axis. One-third.
  • the length of each conversion unit along the rollable direction of the flexible substrate 1 is less than or equal to one-eighth of the minimum circumference of the fixed shaft.
  • the flexible and rigid conversion layer 2 may also be applicable to a flexible display device of a folding type, a fixed arc type, or other morphological changes.
  • the display composed of the flexible substrate 1, the display component 3, and the flexible rigid conversion layer 2 is in a rolled state, the flexible rigid conversion layer 2 is not energized, and its film quality is in a flexible state.
  • Non-maximum display status of the display The fixed axis is partially open, and the display only works on a part of the area.
  • the control module 24 outputs a part of the electrical signal according to the working area of the display, and the flexible rigidity conversion layer 2 is energized in a part of the area.
  • the flexible film in the part area is converted from flexible to rigid.
  • the rigid conversion layer 2 and the flexible substrate 1 are directly adhered together, and the flexible substrate 1 is also tiled accordingly, which plays a role of planarizing the flexible substrate 1.
  • the fixed axis control system performs calculations according to the display size set by the user and outputs a control signal.
  • the driving system drives and drives the fixed shaft according to the control signal to cause the display element to expand according to the set display size, and the control module outputs an electric signal to the electrode layer of the area corresponding to the set display size according to the control signal;
  • the display closes the display screen according to the shutdown instruction input by the user.
  • the fixed axis control system calculates and outputs a control signal according to the instruction of the retracted display input by the user;
  • the control module obtains a control signal and turns off the electrical signal.
  • the flexible rigid conversion layer recovers flexibility
  • the driving system drives the fixed shaft to roll up the display according to the control signal
  • the flexible display device provided by the embodiment of the present disclosure includes a flexible substrate and a flexible rigid conversion layer formed on one side of the flexible substrate; the flexible rigid conversion layer includes a conversion film capable of performing flexible and rigid conversion under the action of an electric field, and is used to form a driver An electrode layer that transforms a thin film into an electric field.
  • the conversion film in the flexible display device provided by the present disclosure can switch elastic parameters under the action of an electric field, and switch from a flexible layer to a rigid layer, thereby realizing the planarization of the flexible substrate, and the conversion of the conversion film can also reduce the flexibility of the flexible substrate. The damage during the curling and unfolding process is repeated many times, thereby extending the life of the display device and improving the display quality.

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Abstract

一种柔性显示装置，涉及显示技术领域，该柔性显示装置包括：柔性衬底（1）；形成于柔性衬底（1）一侧的柔性刚性转化层（2），柔性刚性转化层（2）包括可在电场作用下进行柔性与刚性转化的转化薄膜（21）和用于形成驱动转化薄膜（21）变化的电场的电极层（22）。

Description

柔性显示装置
本申请要求在2018年05月31日提交中国专利局、申请号为201810571147.4、发明名称为“一种柔性显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及显示技术领域，特别涉及一种柔性显示装置。
背景技术
柔性显示装置是由柔性材料制成的、可弯曲形变的显示器件，由于其可弯曲、轻便等卓越的显示特质，柔性显示装置可被应用在可穿戴设备、移动设备、增强现实与虚拟技术设备等多个领域，被认为是未来显示领域的主流。
柔性显示装置通常被制作为在非运行状态可通过卷曲或折叠收起，运行时展开的结构。但是，柔性显示装置的衬底材料在人为卷曲/折叠过程中容易受到损伤，而且在长期的折叠/卷曲存放后也会发生不可逆形变、导致出现折痕或翘曲的问题。而上述问题会使得衬底材料展开后存在不平整等问题，影响到显示器的显示效果。同时由于衬底的不平整也会影响到显示器内部结构的工作特性和寿命，降低显示器的可靠性。
发明内容
本公开提供了一种柔性显示装置，具体方案如下：
一种柔性显示装置，包括：
柔性衬底；
位于所述柔性衬底一侧的柔性刚性转化层；其中，
所述柔性刚性转化层包括：电极层和可在电场作用下进行柔性与刚性转化的转化薄膜；所述电极层用于形成驱动所述转化薄膜进行柔性与刚性转化的电场。
本公开提供了一种柔性显示装置，上述柔性显示装置包括柔性衬底和形成于柔性衬底一侧的柔性刚性转化层，柔性刚性转化层包括转化薄膜和电极层。具体的，当电极层产生用于使转化薄膜由柔性转化为刚性的电场后，转化薄膜在垂直于电场方向伸展，弹性模量改变，膜层舒展平铺，且由于柔性刚性转化层形成于柔性衬底，则柔性衬底也会相应的平铺，从而可起到使柔性衬底平坦化的作用；此外，通过调节电极层可使处于电场内的转化薄膜由刚性转化为柔性，之后，柔性衬底失去支撑，从而可满足使用者对柔性显示装置的卷曲或弯折需求。并且，转化薄膜可在电场作用下切换弹性参数，由柔性层切换为刚性层，从而实现柔性衬底的平坦化，且通过转化薄膜的转化也可降低柔性衬底在多次重复卷曲、展开过程中的损坏，从而延长显示装置寿命、提升显示品质。
附图说明
图1为本公开实施例提供的柔性显示装置结构图；
图2为本公开实施例提供的柔性显示装置又一结构图；
图3为本公开实施例提供的结构一中结构示意图；
图4为本公开实施例提供的形式一中结构示意图；
图5为本公开实施例提供的结构二中结构示意图；
图6为本公开实施例提供的形式三中结构示意图；
图7为本公开实施例提供的形式四中结构示意图；
图8为本公开实施例提供的显示装置又一结构示意图；
图9为本公开实施例提供的显示装置又一结构示意图；
图10为本公开实施例提供的柔性显示装置的流程图。
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。
本公开提供一种柔性显示装置，如图1所示，包括：
柔性衬底1；
位于柔性衬底1一侧的柔性刚性转化层2；其中，
柔性刚性转化层2包括：电极层22和可在电场作用下进行柔性与刚性转化的转化薄膜21；电极层22用于形成驱动转化薄膜21进行柔性与刚性转化的电场。
本公开提供了一种柔性显示装置，上述柔性显示装置包括柔性衬底1和形成于柔性衬底1一侧的柔性刚性转化层2，柔性刚性转化层2包括转化薄膜21和电极层22。具体的，当电极层22产生用于使转化薄膜21由柔性转化为刚性的电场后，转化薄膜21在垂直于电场方向伸展，弹性模量改变，膜层舒展平铺，且由于柔性刚性转化层2形成于柔性衬底1上，则柔性衬底1也会相应的平铺，从而可起到使柔性衬底1平坦化的作用；之后，通过调节电极层22可使处于电场内的转化薄膜21由刚性转化为柔性，此时，柔性衬底1失去支撑，从而可满足使用者对柔性显示装置的卷曲或弯折需求。
本公开提供的柔性显示装置中的转化薄膜21可在电场作用下切换弹性参数，由柔性层切换为刚性层，从而实现柔性衬底1的平坦化，且通过转化薄膜21的转化也可降低柔性衬底1在多次重复卷曲、展开过程中的损坏，从而延长显示装置寿命、提升显示品质。
因此，上述显示装置可延长柔性衬底1的寿命、提升显示装置的显示效果并提高显示装置的可靠性。
需要说明的是，柔性衬底1上设有显示元器件3，该显示元器件3可为有机致电发光显示器件或者柔性液晶显示器件等，具体的，请参考图2，显示元器件3具体结构可以包括沿背离柔性衬底1方向依次设置的薄膜晶体管开关31、发光层32、封装层33以及保护层34，此外，显示元器件3内还可设有用于控制显示元器件3正常显示功能的控制芯片，在此不做具体限定。
值得注意的是，柔性刚性转化层2可位于柔性衬底1与显示元器件3之间，或者柔性刚性转化层2位于显示元器件3背离柔性衬底1的一侧，或者柔性刚性转化层2位于柔性衬底1背离显示元器件3的一侧，作为一种优选实施方式，选取柔性刚性转化层2位于柔性衬底1背离显示元器件3的一侧。
可选地，在本公开实施例提供的柔性显示装置中，柔性衬底1可使用有机或无机柔性材料，具体的，可以为聚酰亚胺、聚萘二甲酸乙二醇酯、聚对苯二甲酸乙二醇酯、金属薄膜或其他可弯折衬底材料，在此不做具体限定。
可选地，在本公开实施例提供的柔性显示装置中，柔性刚性转化层2中的转化薄膜21可采用介电弹性材料，在通电情况下可发生弹性参数改变，由柔性转化为刚性。
具体的，转化薄膜21的制备材料可选取硅橡胶类、丙烯酸酯类材料、碳纳米管材料等的聚合物材料，而在实际制备过程中可通过丝网印刷、面涂、数码印制等方式涂覆前驱体材料，并通过热固化或紫外方式固化成膜。
需要说明的是，由于转化薄膜21的制备原料在工业上较为常用，且制备工艺也较为成熟，因而可降低本公开提供的柔性显示装置的制备难度，提高生产效率。
在具体实施时，电极层22的制备材料可以为非金属导电材料，如铟锡氧化物、铝掺杂的氧化锌或其他非金属导电材料，且当采用该种材料时可通过喷溅、蒸镀等方式成膜，或者电极层22的制备材料可以为金属导电材料，如Au、Ag、Cu、Fe等，采用该种材料时通过蒸镀等方式成膜。
在上述技术方案的基础上，需要说明的是，柔性刚性转化层2的结构有多种，具体至少为以下几种结构中的一种：
结构一：
请参考图3，转化薄膜21包括多个转化单元，多个转化单元沿柔性衬底1的可卷曲方向排列、且各转化单元间绝缘设置。
需要说明的是，上述结构中多个转化单元实现了对柔性衬底1平坦化的区域化控制，各转化单元可控制与自身对应的部分柔性衬底1的平坦化，且 多个转化单元间的间隔尺寸由绝缘材料的绝缘特性决定，在此不做限制。
在上述技术方案的基础上，需要说明的是，当转化薄膜21包括多个转化单元时，电极层22的设置形式存在多种可能，至少为以下两种中的一种：
形式一：请参考图4，电极层22包括第一电极层221和第二电极层222，第一电极层221包括多个与转化单元一一对应的第一电极单元，转化单元位于对应的第一电极单元与第二电极层222之间。
在具体实施时，第一电极层可以为阳极层，第二电极层为阴极层；或者，第一电极层为阴极层，第二电极层为阳极层。
可选地，在本公开实施例提供的柔性显示装置中，第一电极单元位于转化单元背离柔性衬底1一侧，第二电极层222位于转化薄膜21朝向柔性衬底1一侧。
结构二：
请参考图5，转化薄膜21包括一个转化单元。
需要说明的是，转化薄膜21仅包括一个转化单元，即转化薄膜21整层铺设于柔性衬底1的一侧，以实现对柔性衬底1的平坦化作用。
在上述技术方案的基础上，需要说明的是，当转化薄膜21包括一个转化单元时，电极层22的设置形式存在多种可能，至少为以下两种中的一种：
形式二：请参考图6，电极层22包括第一电极层221和第二电极层222，第一电极层221与第二电极层222分别位于转化薄膜21的两侧。
形式三：请参考图7，电极层22包括第一电极层221和第二电极层222，第一电极层221与第二电极层222位于转化薄膜21的同侧，且第一电极层221包括多个第一电极单元，第二电极层222包括多个第二电极单元，多个第二电极单元与多个第一电极单元位于间隔且交替设置于同一层。
需要说明的是，制备上述形式三中的电极层22时，可通过刻蚀或涂覆形成第一电极层221和第二电极层222。
在上述技术方案的基础上，为了起到平整表面以及保护电极的作用，作为一种可选的实施方式，柔性刚性转化层2还包括用于增加平整度的平坦层 23，平坦层23位于转化薄膜21以及电极层22背离柔性衬底1的一侧，例如图4、图6与图7中所示。
由于上述各技术方案中电极层22与转化薄膜21的位置关系存在多种可能，因而，具体的，以靠近柔性衬底1为内侧作为基准，平坦层23位于柔性刚性转化层2中各膜层的最外侧。
需要说明的是，平坦层23可以使用氮化硅等无机薄膜或其他具有保护作用的有机膜层，而具体制备方法可使用等离子体增强化学的气相沉积法、原子层沉积方法或其他方式。
此外，柔性刚性转化层2还可包括用于负责输出转化薄膜21在柔性与刚性间转化所需信号的控制模块24，控制模块24输出的电信号可由电学走线传输至电极层22并施加于转化薄膜21上，请参考图8和图9。
在上述技术方案的基础上，控制模块24输出的电信号可为脉冲信号，具体的，电极层22接收到控制模块24的脉冲电压信号后产生电场，转化薄膜21被在垂直于电场方向伸展，弹性模量改变，膜层舒展平铺，此时由于转化薄膜21与柔性衬底1粘附在一起，柔性衬底1也相应的平铺，起到柔性衬底1平坦化作用。
需要说明的是，转化薄膜21在被施加电信号后一定时间内可保持刚性，直至下一个脉冲电压施加，而施加脉冲电压的间隔时间需小于或等于转化层的刚性保持时间，具体的间隔时间及电压幅值需根据材料结构、掺杂情况等综合制定。
此外，控制模块24也可集成于本公开提供的柔性显示装置的控制系统内或显示元器件3的控制芯片中。
在上述技术方案的基础上，本公开提供的柔性显示装置还包括位于柔性衬底1一端的固定轴，柔性衬底1以固定轴为卷轴具有展开状态和卷曲状态。
需要说明的是，固定轴为圆柱状结构，显示元器件3位于柔性衬底1朝向固定轴的一侧，在需要相对固定轴卷曲柔性衬底1时，柔性衬底1以及柔性衬底1上的显示元器件3和柔性刚性转化层2以固定轴的中心点进行卷曲。
在上述技术方案的基础上，本公开提供的柔性显示装置还包括用于控制柔性衬底1在展开状态与卷曲状态间切换的卷曲装置以及用于驱动卷曲装置动作的驱动系统。
为了缩小本公开提供的柔性显示装置体积，作为一种可选的实施方式，卷曲装置与驱动系统位于固定轴，驱动系统可以选取空气压缩式系统或其他移动动力系统。
此外，固定轴内还可设有用于控制驱动系统动作的固定轴控制系统，固定轴控制系统可包括控制电路以及移动控制面板等，用户可通过固定轴控制系统调节柔性衬底1、显示元器件3以及柔性刚性转化层2组成的显示器进行卷曲、打开及放映动作，并调节显示器的实际显示尺寸和分辨率，当然，用户也可以通过手动卷曲的形式将显示器以固定轴为中心卷起。
在上述技术方案的基础上，固定轴的长度及半径可以为固定，或者，固定轴沿径向方向尺寸可调；和/或，固定轴沿自身延伸方向尺寸可调。
需要说明的是，固定轴的尺寸调节可以通过人工手动设置，也可以通过固定轴伸缩装置控制，而固定轴具体的直径和长度根据显示器的最小曲率半径和显示器工作尺寸决定，且驱动系统可为固定轴的长度与半径的变化以及显示器的卷曲/打开提供动力。
在上述技术方案的基础上，需要说明的是，当转化薄膜21包括多个转化单元时，沿柔性衬底1的可卷曲方向，每个转化单元的长度小于或等于固定轴最小周长的八分之一。
此外，当固定轴的半径尺寸可调时，沿柔性衬底1的可卷曲方向，每个转化单元的长度小于等于固定轴最小周长的八分之一。
需要说明的是，柔性刚性转化层2可同样适用于折叠式、固定弧度式或其他形态改变的柔性显示装置。
本发明实施例提供的柔性显示装置具有如下三种工作状态：
1、在关闭状态下：柔性衬底1、显示元器件3以及柔性刚性转化层2组成的显示器为卷曲状态，柔性刚性转化层2不通电，且其膜质为柔性状态。
2、显示器最大尺寸运行状态：固定轴完全打开，显示器呈最大面积放开状态。此时，控制模块24输出电信号，柔性刚性转化层2各个区域全部通电，转化薄膜21由柔性转化为刚性，转化薄膜21膜层舒展平铺，由于柔性刚性转化层2与柔性衬底1直接粘附在一起，柔性衬底1也相应的平铺，起到柔性衬底1平坦化作用。
3、显示器非最大尺寸运行状态：固定轴部分打开，显示器仅部分面积工作。此时，控制模块24根据显示器工作面积输出部分电信号，柔性刚性转化层2对应部分区域通电，由该部分区域内柔性薄膜由柔性转化为刚性，该部分柔性薄膜膜层舒展平铺，由于柔性刚性转化层2与柔性衬底1直接粘附在一起，柔性衬底1也相应的平铺，起到柔性衬底1平坦化作用。
在具体实施时，本公开提供的柔性显示装置的工作流程，请参考图10：
S101、固定轴控制系统根据用户设定的显示尺寸进行运算并输出控制信号；
S102、驱动系统根据控制信号运转驱动固定轴使显示元器按照设定的显示尺寸展开，并且控制模块根据控制信号向与设定的显示尺寸对应的区域的电极层输出电信号；
S103、与展开的显示部分对应区域的柔性刚性转化层硬化；
S104、显示器显示画面；
S105、根据用户输入的关闭指令显示器关闭显示画面；
S106、固定轴控制系统根据用户输入的收起显示器的指令运算并输出控制信号；
S107、控制模块获取控制信号并关闭电信号；
S108、柔性刚性转化层恢复柔性；
S109、驱动系统根据控制信号运转驱动固定轴卷起显示器；
S110、系统关闭、显示器处于卷起状态。
本公开实施例提供的柔性显示装置包括柔性衬底和形成于柔性衬底一侧的柔性刚性转化层；柔性刚性转化层包括可在电场作用下进行柔性与刚性转 化的转化薄膜和用于形成驱动转化薄膜变化的电场的电极层。本公开提供的柔性显示装置中的转化薄膜可在电场作用下切换弹性参数，由柔性层切换为刚性层，从而实现柔性衬底的平坦化，且通过转化薄膜的转化也可降低柔性衬底在多次重复卷曲、展开过程中的损坏，从而延长显示装置寿命、提升显示品质。
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. 一种柔性显示装置，其中，包括：
    柔性衬底；
    位于所述柔性衬底一侧的柔性刚性转化层；其中，
    所述柔性刚性转化层包括：电极层和可在电场作用下进行柔性与刚性转化的转化薄膜；所述电极层用于形成驱动所述转化薄膜进行柔性与刚性转化的电场。
  2. 根据权利要求1所述的柔性显示装置，其中，所述转化薄膜包括多个转化单元，多个所述转化单元沿所述柔性衬底的可卷曲方向排列、且各所述转化单元间绝缘设置。
  3. 根据权利要求2所述的柔性显示装置，其中，所述电极层包括第一极层和第二电极层，所述第一电极层包括多个与所述转化单元一一对应的第一电极单元，所述转化单元位于对应的所述第一电极单元与所述第二电极层之间。
  4. 根据权利要求3所述的柔性显示装置，其中，所述第一电极单元位于所述转化单元背离所述柔性衬底一侧，所述第二电极层位于所述转化薄膜朝向所述柔性衬底一侧。
  5. 根据权利要求1所述的柔性显示装置，其中，所述转化薄膜包括一个转化单元。
  6. 根据权利要求5所述的柔性显示装置，其中，所述电极层包括第一电极层和第二电极层，所述第一电极层与所述第二电极层分别位于所述转化薄膜的两侧。
  7. 根据权利要求5所述的柔性显示装置，其中，所述电极层包括第一电极层和第二电极层，所述第一电极层与所述第二电极层位于所述转化薄膜的同侧，且所述第一电极层包括多个第一电极单元，所述第二电极层包括多个第二电极单元，多个所述第二电极单元与多个所述第一电极单元间隔且交替 设置于同一层。
  8. 根据权利要求1-7任一项所述的柔性显示装置，其中，所述柔性刚性转化层还包括用于增加平整度的平坦层，所述平坦层位于所述转化薄膜以及所述电极层背离所述柔性衬底的一侧。
  9. 根据权利要求1-7任一项所述的柔性显示装置，其中，所述转化薄膜的材料为介电弹性材料。
  10. 根据权利要求9所述的柔性显示装置，其中，所述介电弹性材料为硅橡胶类聚合物材料、丙烯酸酯类聚合物材料或者碳纳米管聚合物材料。
  11. 根据权利要求1-7任一项所述的柔性显示装置，其中，还包括位于所述柔性衬底一端的固定轴，所述柔性衬底以所述固定轴为卷轴具有展开状态和卷曲状态。
  12. 根据权利要求11所述的柔性显示装置，其中，还包括：
    用于控制所述柔性衬底在展开状态与卷曲状态间切换的卷曲装置；
    用于驱动所述卷曲装置动作的驱动系统。
  13. 根据权利要求11所述的柔性显示装置，其中，所述固定轴在沿径向方向和沿自身延伸方向中至少沿其中一个方向尺寸可调。
  14. 根据权利要求13所述的柔性显示装置，其中，当所述转化薄膜包括多个转化单元时，每个所述转化单元在沿所述柔性衬底的可卷曲方向的宽度小于或等于所述固定轴的最小周长的八分之一。
PCT/CN2019/082758 2018-05-31 2019-04-15 柔性显示装置 WO2019228088A1 (zh)

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