WO2018192172A1 - 柔性显示屏及其变形驱动方法、显示装置 - Google Patents

柔性显示屏及其变形驱动方法、显示装置 Download PDF

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Publication number
WO2018192172A1
WO2018192172A1 PCT/CN2017/103124 CN2017103124W WO2018192172A1 WO 2018192172 A1 WO2018192172 A1 WO 2018192172A1 CN 2017103124 W CN2017103124 W CN 2017103124W WO 2018192172 A1 WO2018192172 A1 WO 2018192172A1
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WIPO (PCT)
Prior art keywords
deformation
flexible display
display screen
fixing
display panel
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PCT/CN2017/103124
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English (en)
French (fr)
Inventor
刘君欢
赵天笑
杨瑞锋
杨华旭
李桐
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to EP17838025.9A priority Critical patent/EP3614367B1/en
Priority to US16/003,666 priority patent/US11362288B2/en
Publication of WO2018192172A1 publication Critical patent/WO2018192172A1/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
    • 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
    • G09F9/33—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 being semiconductor devices, e.g. diodes
    • 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
    • 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
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • H10N30/204—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders
    • H10N30/2041—Beam type
    • H10N30/2042—Cantilevers, i.e. having one fixed end
    • H10N30/2046—Cantilevers, i.e. having one fixed end adapted for multi-directional bending displacement
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/802—Circuitry or processes for operating piezoelectric or electrostrictive devices not otherwise provided for, e.g. drive circuits
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • H10N30/204—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a flexible display screen, a deformation driving method thereof, and a display device.
  • Flexible display technology has developed rapidly in recent years, which has led to great progress in flexible display devices ranging from screen size to display quality.
  • the flexible display device has many advantages, such as impact resistance, strong shock resistance, light weight, small size, and more convenient carrying.
  • the deformation drive of the flexible display screen is mainly driven by a mechanical drive and a user.
  • the mechanically driven deformation has very little freedom, and the large volume occupied does not meet the needs of the thin and light design of the mobile phone.
  • the user's manual drive also has less freedom of deformation and does not accurately control the deformation.
  • Embodiments of the present disclosure provide a flexible display screen and a deformation driving method thereof, and a display device, which can realize deformation of various degrees of freedom, and can accurately control deformation, and is easy to realize an ultra-thin design of the screen.
  • a flexible display screen comprising: a flexible display panel; and a deformation driver disposed on a back surface of the flexible display panel, the deformation driver driving the flexible display panel to deform based on electro-deformation; the deformation
  • the driver includes a plurality of deformation units arranged in an array.
  • the deformation unit includes at least three branches, and an angle between any two adjacent ones of the at least three branches is greater than 0° and less than 180°;
  • the at least three branches each extend outward from a central position of the deformation unit.
  • the deformation unit includes four branches; the four branches are arranged in a cross shape.
  • the four branches in the deformation unit are fixed to a back surface of the flexible display panel by a first fixing member and four second fixing members; the first fixing member is located at a center of the deformation unit for simultaneously One end of the four branches is fixed; the four second fixing members are respectively located at four edges of the deformation unit for respectively fixing the other ends of the four branches.
  • the first fixing component comprises a rectangular fixing surface and a fixing post at four corners of the fixing surface; one end of the four branches respectively passes through a gap area between two adjacent fixing pillars Embedded below the fixed surface.
  • the second fixing member includes a top surface and a side wall; and the other end of the branch portion is embedded in a space region surrounded by the top surface and the side wall.
  • the first fixing member and the second fixing member are fixed to a back surface of the flexible display panel by cementing.
  • the branch of the deformation unit comprises a layer of piezoelectric material.
  • each branch is a piezoelectric ceramic bimorph.
  • the flexible display panel may be a flexible OLED display panel.
  • a display device including the flexible display screen described above.
  • the display device includes a flexible circuit board; a power supply wire of each of the strain cells in the deformation driver is connected to the flexible circuit board.
  • a deformation driving method of a flexible display panel comprising the steps of respectively applying a voltage to each of the deformation units of the deformation driver to drive the flexible display panel to be deformed.
  • Embodiments of the present disclosure provide a flexible display screen and a deformation driving method thereof, and a display device by providing a deformation driver based on an electro-deformation working principle on a back surface of a flexible display panel, and causing the deformation driver to include a plurality of arrays arranged in an array
  • the deformation unit can respectively control the voltage applied to each deformation unit to realize the control of the deformation state of the flexible display panel. Therefore, the flexible display provided by the present disclosure can not only accurately control the deformation, but also realize multiple forms and multiple degrees of freedom.
  • the deformation, and without mechanical control makes it easy to implement an ultra-thin design of a flexible display panel.
  • the flexible display screen of the present disclosure also has a receivable remote control.
  • the deformation control is convenient and quick, and it is easy to realize the advantages of program control.
  • FIG. 1 is a schematic diagram 1 of a flexible display screen according to an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram 1 of a flexible display screen after being modified according to an embodiment of the present disclosure
  • FIG. 3 is a second schematic diagram of a flexible display screen according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic diagram 3 of a flexible display screen after being modified according to an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram 4 of a flexible display screen according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram 1 of a deformation unit according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram 2 of a deformation unit according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram 3 of a deformation unit according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram 2 of a flexible display screen according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a first fixing component according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of a second fixing component according to an embodiment of the present disclosure.
  • FIG. 12a is a schematic structural view of a piezoelectric ceramic bimorph according to an embodiment of the present disclosure
  • FIG. 12b is a schematic diagram of a piezoelectric ceramic bimorph deformed according to an embodiment of the present disclosure.
  • the embodiment of the present disclosure provides a flexible display screen, as shown in FIG. 1 , including a flexible display panel 10 , a deformation driver 20 disposed on the back surface of the flexible display panel 10 , and the deformation driver 20 drives the flexible display panel 10 to deform based on electro-deformation. ; among them, the deformation drive A plurality of deformation units 201 arranged in an array are included.
  • the deformation driver 20 drives the flexible display panel 10 to be deformed based on the electro-deformation, that is, after applying a voltage to the deformation unit 201 in the deformation driver 20, the deformation unit 201 is bent and deformed in response to the applied voltage, thereby driving the flexibility.
  • the display panel 10 is deformed; wherein the flexible display panel 10 can be subjected to different forms of bending deformation depending on the voltage applied to the respective deformation units 201.
  • a voltage of not zero may be applied thereto, or no voltage may be applied thereto (ie, a voltage of zero is applied).
  • the deformation driver 20 can be integrally bent in a shape as shown in FIG. 2, FIG. 3, FIG. 4 or FIG. 5, thereby driving the flexible display panel 10 as well. Deformed in the same or similar shape.
  • the deformed shape exemplified in FIG. 2 it is achieved by applying a gradually increasing (for example, linearly increasing) voltage value to the deforming unit 201 of the first to sixth columns from left to right, that is, The voltages applied to the respective deformation units 201 in the same row are sequentially increased from left to right, and the voltage values applied to the respective deformation units 201 in the same column (from top to bottom) are the same. Therefore, the deformation is smoothly performed from left to right as a whole.
  • a gradually increasing (for example, linearly increasing) voltage value to the deforming unit 201 of the first to sixth columns from left to right
  • the deformation of the example shown in FIG. 3 is substantially similar to that of FIG. 2, except that the voltage values of the first to sixth columns from left to right are increased by a larger magnitude than that of FIG. Therefore, the degree of deformation is more severe.
  • the deformation unit 201 to the eighth column is achieved by applying a zero voltage value. Therefore, the first four columns are smoothly deformed from left to right, and the last three columns are substantially not deformed.
  • the deformed shape as exemplified in FIG. 5 is achieved by applying a voltage of not zero to the four strain cells 201 located at the upper right corner portion without applying a voltage to the remaining strain cells 201. Therefore, only the area of the upper right corner portion is deformed, and the remaining portion is not deformed.
  • the configuration of the strain unit 201 is not limited as long as it can be deformed in response to the applied voltage.
  • the deformation unit 201 since the deformation unit 201 is deformed based on the applied voltage, it will be understood by those skilled in the art that the deformation unit 201 includes a power supply wire. Voltage through The electric wires are applied to the deformation unit 201.
  • the flexible display panel 10 has a light-emitting surface, and the other surface opposite to the light-emitting surface is a back surface.
  • each deformation unit 201 in the deformation driver 20 and the back surface of the flexible display panel 10 is not limited, as long as the deformation of the deformation driver 20 as a whole does not affect the flexible display panel 10 to follow the deformation driver 20 to generate the same or similar.
  • the shape can be deformed.
  • the embodiment of the present disclosure provides a flexible display screen by providing a deformation driver 20 based on an electro-deformation working principle on the back surface of the flexible display panel 10, and the deformation driver 20 includes a plurality of deformation units 201 arranged in an array, respectively
  • the voltage applied to each of the deformation units 201 is controlled to realize the control of the deformation state of the flexible display panel 10. Therefore, the flexible display provided by the present disclosure can not only accurately control the deformation, but also realize deformation of multiple forms and multiple degrees of freedom. Moreover, it is easy to realize the ultra-thin design of the flexible display panel 10 without mechanical control.
  • the deformation of the flexible display screen can be realized only by controlling the voltage applied to each of the deformation units 201, the flexible display screen of the present disclosure has the functions of receiving remote control, facilitating deformation control, and facilitating program control. advantage.
  • the deformation unit 201 includes at least three branches 202, and the angle between any two adjacent branches 202 of at least three of the branches 202 is greater than 0° and less than 180°. At least three of the branches 202 extend outward from the center of the deformation unit 201.
  • the angle between the adjacent two branches 202 shown in FIG. 6 is 120°; the angle between the adjacent two branches 202 shown in FIG. 7 is 90°; the adjacent two shown in FIG.
  • the angle of the branch 202 is 45°.
  • Each of the branches 202 has a font shape.
  • the branch 202 when a voltage is applied thereto, the branch 202 can be regarded as a vector, and based on the principle of vector synthesis, by controlling the magnitude of the voltage applied to each branch 202, Each of the deformation units 201 is deformed in various states, thereby causing the flexible display panel 10 to realize various forms of deformation and various degrees of freedom.
  • the deformation unit 201 includes four branches 202; the four branches 202 are arranged in a cross shape.
  • the deformation unit 201 comprises four branches 202, a more slight deformation of the flexible display panel 10 can be achieved; compared to the deformation unit 201 comprising more than four branches 202, when the deformation unit 201 includes four branches 202 when The structure of the deforming unit 201 is relatively simple and low in cost.
  • the four branch portions 202 in the deformation unit 201 are fixed to the back surface of the flexible display panel 10 by the first fixing member 31 and the second fixing member 32.
  • the first fixing member 31 is located at the center of the deformation unit 201 for fixing one end of the four branches 202 at the same time.
  • the second fixing members 32 are respectively located at the four edges of the deformation unit 201 for respectively fixing the four branches 202. One end.
  • the embodiment of the present disclosure simultaneously fixes one end of the four branches 202 by one first fixing member 31, and the four second fixing members 32 respectively fix the other ends of the four branches 202.
  • each branch 202 can be effectively fixed, and
  • the four branches 202 are arranged in a cross shape; on the other hand, the deformation of the flexible display panel 10 is not affected by the large area distribution of the fixing members.
  • the first fixing member 31 includes a rectangular fixing surface 311 and fixing posts 312 located at four corners of the fixing surface 311 and extending downward from the fixing surface; one ends of the four branches 202 are respectively adjacent to each other. A gap region between the two fixing posts 312 is embedded below the fixing surface 311.
  • the second fixing member 32 includes a top surface 321 and a side wall 322 extending downward from the top surface 321; the other end of the branch portion 202 is embedded in a space region surrounded by the top surface 321 and the side wall 322.
  • the structure of the first fixing member 31 By designing the structure of the first fixing member 31 to include one fixing surface 311 and four fixing posts 312, the four branch portions 202 can be easily inserted through the region between the adjacent two fixing posts 312, respectively.
  • the structure of the second fixing member 32 By designing the structure of the second fixing member 32 to include the top surface 321 and the side wall 322, the other end of each of the branch portions 202 can be more easily embedded in the area surrounded by the top surface 321 and the side wall 322. The effect of fixing each of the branches 202 is better, and the fixing process of the deformation unit 201 and the flexible display panel 10 is relatively simple.
  • the first fixing member 31 and the second fixing member 32 are fixed to the back surface of the flexible display panel 10 by cementing (also by snapping). That is, the first fixing member 31 and the second fixing member 32 are fixed to the back surface of the flexible display panel 10 by the bonding material.
  • the cost is lower, on the other hand, the process is simple.
  • the branch 202 of the drive unit 201 includes a layer of piezoelectric material.
  • the piezoelectric material layer deformation is based on the reverse piezoelectric effect of the piezoelectric material.
  • the piezoelectric material layer can generate mechanical strain, thereby bending The shape of the curve changes.
  • the piezoelectric material layer can be restored to its original state.
  • the material of the piezoelectric material layer may be a piezoelectric ceramic material or an organic piezoelectric material; the piezoelectric ceramic material may be selected from at least one of zinc oxide (ZnO), aluminum nitride (AlN), and lead zirconate titanate;
  • the organic piezoelectric material may be polyvinylidene fluoride (PVDF).
  • the piezoelectric material can be more selective, a piezoelectric material having a lower performance and a lower cost can be selected as the material of the piezoelectric material layer.
  • each branch 202 is a piezoelectric ceramic bimorph.
  • the piezoelectric ceramic bimorph is bonded by two identical piezoelectric ceramic sheets 203, and the polarization directions of the two piezoelectric ceramic sheets 203 in the thickness direction are opposite.
  • the piezoelectric ceramic piece 203 of the upper portion of the piezoelectric ceramic bimorph is connected to the positive electrode, and the piezoelectric ceramic piece 203 of the piezoelectric ceramic bimorph is connected to the negative electrode, the piezoelectric ceramic located at the upper portion
  • the sheet 203 is elongated and deformed, and the piezoelectric ceramic sheet 203 located at the lower portion is contracted and deformed, so that the piezoelectric ceramic bimorph produces downward bending deformation, and the curvature of the deformation can be controlled by voltage.
  • the OLED (Organic Light-Emitting Diode) display panel has the advantages of a wide viewing angle range, uniform image quality, fast response speed, and easy flexibility. Therefore, the flexible display panel 10 can be a flexible OLED display. panel.
  • the flexible OLED display panel comprises a flexible substrate, and a light emitting device disposed on the flexible substrate.
  • the light emitting device includes an anode, a functional layer of an organic material, and a cathode.
  • the organic material functional layer may include a light emitting layer, and further may further include an electron transport layer and a hole transport layer; on the basis of which, in order to improve the efficiency of electron and hole injection into the light emitting layer, the organic material functional layer may further include An electron injection layer between the cathode and the electron transport layer, and a hole injection layer disposed between the hole transport layer and the anode.
  • Embodiments of the present disclosure also provide a display device including the flexible display screen described above. It has the same beneficial effects as the above flexible display screen, and will not be described again here.
  • the display device includes a flexible circuit board to which the power supply wires of each of the strain cells 201 are connected. A voltage is supplied from each of the strain cells 201 by the flexible circuit board.
  • the control of the supply voltage of each of the deformation units 201 can be performed by the circuit on the flexible circuit board without additional setting of control components, which has less influence on the overall structure of the display device.
  • the embodiment of the present disclosure further provides a deformation driving method of the flexible display screen, comprising: applying voltages to the respective deformation units 201 of the deformation driver 20 to drive the flexible display panel 10 to be deformed.
  • the embodiment of the present disclosure further provides a deformation driving method of the flexible display screen.
  • the control of the deformation state of the flexible display panel 10 can be realized, and thus, the flexible display provided by the present disclosure
  • the screen not only can precisely control the deformation, realizes deformation of multiple forms and multiple degrees of freedom, and does not require mechanical control, and is easy to realize the ultra-thin design of the flexible display panel 10.
  • the deformation of the flexible display screen can be realized only by controlling the voltage applied to each of the deformation units 201, the flexible display screen of the present disclosure has the functions of receiving remote control, facilitating deformation control, and facilitating program control. advantage.

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  • General Physics & Mathematics (AREA)
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Abstract

一种柔性显示屏及其变形驱动方法以及显示装置，柔性显示屏包括柔性显示面板（10）以及设置于柔性显示面板（10）背面的形变驱动器（20），形变驱动器（20）基于电致形变来驱动柔性显示面板（10）变形；形变驱动器（20）包括多个呈阵列排布的形变单元（201）。柔性显示屏可实现多种自由度的变形，且可精确控制变形，易于实现屏幕的超薄设计。

Description

柔性显示屏及其变形驱动方法、显示装置
相关申请
本申请要求保护在2017年4月18日提交的申请号为201710255418.0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
本公开涉及显示技术领域，尤其涉及一种柔性显示屏及其变形驱动方法、显示装置。
背景技术
柔性显示技术在近些年来有了飞速的发展，由此带动柔性显示装置从屏幕尺寸到显示质量都取得了很大进步。与传统的刚性显示装置相比，柔性显示装置具有诸多优点，例如耐冲击，抗震能力强，重量轻，体积小，携带更加方便等。
目前柔性显示屏的变形驱动主要是机械驱动和使用者手动驱动。机械驱动的变形的自由度极少，且占用的体积较大不符合手机轻薄设计的需求。使用者手动驱动同样有较少的变形自由度，而且不可精确控制变形。
公开内容
本公开的实施例提供一种柔性显示屏及其变形驱动方法、显示装置，可实现多种自由度的变形，且可精确控制变形，易于实现屏幕的超薄设计。
为达到上述目的，本公开的实施例采用如下技术方案：
第一方面，提供一种柔性显示屏，包括：柔性显示面板；以及设置于所述柔性显示面板背面的形变驱动器，所述形变驱动器基于电致形变来驱动所述柔性显示面板变形；所述形变驱动器包括多个呈阵列排布的形变单元。
根据本公开的一个方面，所述形变单元包括至少三个支部，所述至少三个支部中任意相邻的两个支部的夹角大于0°小于180°；其中， 所述至少三个支部均由所述形变单元的中心位置向外延伸。
根据本公开的一个方面，所述形变单元包括四个支部；所述四个支部呈十字型排布。
所述形变单元中的所述四个支部由第一固定部件和四个第二固定部件固定于所述柔性显示面板的背面；所述第一固定部件位于所述形变单元的中心，用于同时固定所述四个支部的一端；所述四个第二固定部件分别位于所述形变单元的四个边缘，用于分别固定所述四个支部的另一端。
进一步的，所述第一固定部件包括一个矩形固定面以及位于所述固定面四个角的固定柱；所述四个支部的一端分别通过相邻的两个所述固定柱之间的空隙区域嵌入所述固定面的下方。
根据本公开的一个方面，所述第二固定部件包括顶面以及侧壁；支部的另一端嵌入由所述顶面和所述侧壁围成的空间区域内。
根据本公开的一个方面，所述第一固定部件和所述第二固定部件通过胶结方式固定于所述柔性显示面板的背面。
根据本公开的一个方面，所述形变单元的支部包括压电材料层。
根据本公开的一个方面，每个支部为一个压电陶瓷双晶片。
基于上述，所述柔性显示面板可以为柔性OLED显示面板。
第二方面，提供一种显示装置，包括以上所述的柔性显示屏。
根据本公开的一个方面，所述显示装置包括柔性电路板；形变驱动器中每个形变单元的供电导线连接至所述柔性电路板。
第三方面，提供一种如第二方面所述柔性显示屏的变形驱动方法，包括如下步骤：分别向形变驱动器的各形变单元施加电压，以驱动所述柔性显示面板变形。
本公开的实施例提供一种柔性显示屏及其变形驱动方法、显示装置，通过在柔性显示面板的背面设置基于电致形变工作原理的形变驱动器，并使形变驱动器包括多个呈阵列排布的形变单元，可分别控制施加至每个形变单元上的电压，实现对柔性显示面板变形状态的控制，因而，本公开提供的柔性显示屏不但可精确控制变形，实现多个形态、多个自由度的变形，而且无需机械控制，易于实现柔性显示面板的超薄设计。此外，由于只需控制施加至每个形变单元上的电压即可实现柔性显示屏的变形，因而本公开的柔性显示屏还具有可接收远程控制， 变形控制方便快捷，易于实现程序化控制等优点。
附图说明
为了更清楚地说明本公开实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本公开实施例提供的一种柔性显示屏的示意图一；
图2为本公开实施例提供的一种柔性显示屏变形后的示意图一；
图3为本公开实施例提供的一种柔性显示屏变形后的示意图二；
图4为本公开实施例提供的一种柔性显示屏变形后的示意图三；
图5为本公开实施例提供的一种柔性显示屏变形后的示意图四；
图6为本公开实施例提供的一种形变单元的结构示意图一；
图7为本公开实施例提供的一种形变单元的结构示意图二；
图8为本公开实施例提供的一种形变单元的结构示意图三；
图9为本公开实施例提供的一种柔性显示屏的示意图二；
图10为本公开实施例提供的一种第一固定部件的结构示意图；
图11为本公开实施例提供的一种第二固定部件的结构示意图；
图12a为本公开实施例提供的一种压电陶瓷双晶片的结构示意图；
图12b为本公开实施例提供的一种压电陶瓷双晶片发生形变时的示意图。
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。
本公开实施例提供一种柔性显示屏，如图1所示，包括柔性显示面板10，设置于柔性显示面板10背面的形变驱动器20，形变驱动器20基于电致形变来驱动柔性显示面板10进行变形；其中，形变驱动器 包括多个呈阵列排布的形变单元201。
此处，形变驱动器20基于电致形变，驱动柔性显示面板10变形，即为：向形变驱动器20中的形变单元201施加电压后，形变单元201响应于施加的电压而发生弯曲形变，从而带动柔性显示面板10变形；其中，根据施加在各个形变单元201上的电压的不同，可使柔性显示面板10产生不同形态的弯曲变形。
其中，对于任一个形变单元201而言，根据柔性显示面板10的不同变形形态，可向其施加不为零的电压，也可向其不施加电压(即，施加为零的电压)
示例的，通过分别控制施加至每个形变单元201上的电压，可使形变驱动器20整体呈如图2、图3、图4或如图5所示的形状弯曲，从而带动柔性显示面板10也呈相同或相似的形状变形。
其中，对于如图2所示例的变形形状而言，通过向从左到右的第一列至第六列的形变单元201施加逐渐增大(例如线性地增大)的电压值而达成，即同一行各个形变单元201上所施加的电压从左到右依次递增，而同一列(从上到下)各个形变单元201上所施加的电压值相同。因此，从左到右整体平滑地进行变形。
如图3所示例的变形情况与图2大致类似，所不同的是，从左到右的第一列至第六列的电压值的递增幅度相较图2更大。因此，变形程度更加剧烈。
对于如图4所示例的变形形状而言，通过向从左到右的第一列至第四列的形变单元201施加逐渐增大(例如线性地增大)的电压值，而向第五列至第八列的形变单元201施加0电压值而达成。因此，前四列从左到右平滑地进行变形，后三列基本不形变。
对于如图5所示例的变形形状而言，是通过向位于右上角部分的四个形变单元201所施加的不为0的电压，而向其余的形变单元201不施加电压而达成。因此，仅右上角部分的区域进行变形，后其余部分不形变。
需要说明的是，第一，不对形变单元201的结构进行限定，只要能响应于施加的电压而发生弯曲形变即可。
其中，由于形变单元201是基于施加的电压而发生形变，因而，本领域技术人员应该明白，形变单元201包括供电导线。电压通过供 电导线施加至形变单元201。
第二，柔性显示面板10具有出光面，与出光面相对的另一面则为背面。
第三，不对形变驱动器20中各形变单元201与柔性显示面板10的背面的固定方式进行限定，只要在形变驱动器20整体发生弯曲形变时，不影响柔性显示面板10跟随形变驱动器20产生相同或相似的形状变形即可。
本公开实施例提供一种柔性显示屏，通过在柔性显示面板10的背面设置基于电致形变工作原理的形变驱动器20，并使形变驱动器20包括多个呈阵列排布的形变单元201，可分别控制施加至每个形变单元201上的电压，实现对柔性显示面板10变形状态的控制，因而，本公开提供的柔性显示屏不但可精确控制变形，实现多个形态、多个自由度的变形，而且无需机械控制，易于实现柔性显示面板10的超薄设计。此外，由于只需控制施加至每个形变单元201上的电压即可实现柔性显示屏的变形，因而本公开的柔性显示屏还具有可接收远程控制，变形控制方便快捷，易于实现程序化控制等优点。
根据本公开的一个方面，如图6-8所示，形变单元201包括至少三个支部202，至少三个支部202中任意相邻的两个支部202的夹角大于0°小于180°。至少三个支部202均由形变单元201的中心位置向外延伸。例如，图6所示的相邻的两个支部202的夹角为120°；图7所示的相邻的两个支部202的夹角为90°；图8所示的相邻的两个支部202的夹角为45°。
其中，每个支部202呈一字型。
此处，对于任一个支部202而言，当向其施加电压时，该支部202可看作是一个矢量，基于此，根据矢量合成原理，通过控制向各支部202施加的电压的大小，便可使每个形变单元201呈现各种状态的变形，从而使柔性显示面板10实现各种形态，各种自由度的变形。
根据本公开的一个方面，如图7和图9所示，形变单元201包括四个支部202；四个支部202呈十字型排布。
相较于形变单元201包括三个支部202，当形变单元201包括四个支部202时，可实现柔性显示面板10更微小的变形；相较于形变单元201包括四个以上支部202，当形变单元201包括四个支部202时，使 得形变单元201的结构相对简单，且成本较低。
进一步的，如图9所示，形变单元201中的四个支部202由第一固定部件31和第二固定部件32固定于柔性显示面板10的背面。
其中，第一固定部件31位于形变单元201的中心，用于同时固定四个支部202的一端；第二固定部件32分别位于形变单元201的四个边缘，用于分别固定四个支部202的另一端。
本公开实施例通过一个第一固定部件31同时固定四个支部202的一端，四个第二固定部件32分别固定四个支部202的另一端，一方面，可有效固定每个支部202，而使四个支部202呈十字型排布；另一方面，不会由于固定部件的大面积分布而影响柔性显示面板10的变形。
进一步的，如图10所示，第一固定部件31包括一个矩形固定面311以及位于固定面311四个角并从固定面向下延伸的固定柱312；四个支部202的一端分别通过相邻的两个固定柱312之间的间隙区域嵌入固定面311的下方。
如图11所示，第二固定部件32包括顶面321以及从顶面321向下延伸的侧壁322；支部202的另一端嵌入由顶面321和侧壁322围成的空间区域内。
通过将第一固定部件31的结构设计为包括一个固定面311以及四个固定柱312，可较容易的使四个支部202分别通过相邻的两个固定柱312之间的区域嵌入，在此基础上，通过将第二固定部件32的结构设计为包括顶面321以及侧壁322，可较容易的使每个支部202的另一端嵌入由顶面321和侧壁322围成的区域内，实现较好的固定每个支部202的效果，而且使得形变单元201与柔性显示面板10的固定工艺较为简单。
根据本公开的一个方面，第一固定部件31和第二固定部件32通过胶结方式(也可通过卡扣方式)固定于柔性显示面板10的背面。即，通过粘结材料将第一固定部件31和第二固定部件32固定于柔性显示面板10的背面。这样，一方面，成本较低，另一方面，工艺简单。
根据本公开的一个方面，驱动单元201的支部202包括压电材料层。
此处，压电材料层形变是基于压电材料的逆向压电效应，当在压电材料层上施加电压后，压电材料层可以产生机械应变，从而进行弯 曲形变。当施加在压电材料层上的电压消失，压电材料层可恢复原有状态。
其中，压电材料层的材料可以是压电陶瓷材料或有机压电材料；压电陶瓷材料可选自氧化锌(ZnO)、氮化铝(AlN)、锆钛酸铅中的至少一种；有机压电材料可以为偏聚氟乙烯(PVDF)。
由于压电材料可选择性较多，因而，可选择性能较好成本低的压电材料作为压电材料层的材料。
根据本公开的一个方面，每个支部202为一个压电陶瓷双晶片。其中，如图12a所示，压电陶瓷双晶片是由两片相同的压电陶瓷片203粘结而成，两片压电陶瓷片203沿厚度方向的极化方向相反。
如图12b所示，当压电陶瓷双晶片的位于上部的压电陶瓷片203与正极连接，压电陶瓷双晶片的位于下部的压电陶瓷片203与负极连接时，位于上部的压电陶瓷片203伸长变形，位于下部的压电陶瓷片203收缩变形，从而使得压电陶瓷双晶片产生向下的弯曲变形，而变形的曲率大小可以由电压控制。基于上述，考虑到OLED(Organic Light-Emitting Diode，有机发光二极管)显示面板具有视角范围大、画质均匀、反应速度快、易制作成柔性等优点，因此，柔性显示面板10可以为柔性OLED显示面板。
其中，柔性OLED显示面板包括柔性衬底、设置于柔性衬底上的发光器件。发光器件包括阳极、有机材料功能层以及阴极。有机材料功能层可以包括发光层，进一步还可包括电子传输层和空穴传输层；在此基础上，为了能够提高电子和空穴注入发光层的效率，有机材料功能层进一步还可以包括设置在阴极与电子传输层之间的电子注入层，以及设置在空穴传输层与阳极之间的空穴注入层。
本公开实施例还提供一种显示装置，包括上述的柔性显示屏。其具有与上述柔性显示屏相同的有益效果，在此不再赘述。
根据本公开的一个方面，显示装置包括柔性电路板，形变驱动器20中每个形变单元201的供电导线连接至该柔性电路板。由该柔性电路板向每个形变单元201提供电压。
通过使形变单元201的供电导线连接至柔性电路板，可通过柔性电路板上的电路进行各形变单元201供电电压的控制，而无需额外的设置控制部件，对显示装置的整体结构影响较小。
本公开实施例还提供一种柔性显示屏的形变驱动方法，包括：分别向形变驱动器20的各形变单元201施加电压，以驱动柔性显示面板10变形。
本公开实施例还提供一种柔性显示屏的变形驱动方法，通过分别控制施加至每个形变单元201上的电压，可实现对柔性显示面板10变形状态的控制，因而，本公开提供的柔性显示屏不但可精确控制变形，实现多个形态、多个自由度的变形，而且无需机械控制，易于实现柔性显示面板10的超薄设计。此外，由于只需控制施加至每个形变单元201上的电压即可实现柔性显示屏的变形，因而本公开的柔性显示屏还具有可接收远程控制，变形控制方便快捷，易于实现程序化控制等优点。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (13)

  1. 一种柔性显示屏，其包括：
    柔性显示面板；以及
    设置于所述柔性显示面板背面的形变驱动器，所述形变驱动器基于电致形变来驱动所述柔性显示面板进行变形，
    所述形变驱动器包括多个呈阵列排布的形变单元。
  2. 根据权利要求1所述的柔性显示屏，其中，所述形变单元包括至少三个支部，所述至少三个支部中任意相邻的两个支部的夹角大于0°小于180°；
    其中，所述至少三个支部均由所述形变单元的中心位置向外延伸。
  3. 根据权利要求2所述的柔性显示屏，其中，所述形变单元包括四个支部；所述四个支部呈十字型排布。
  4. 根据权利要求3所述的柔性显示屏，其中，所述形变单元中的所述四个支部由第一固定部件和四个第二固定部件固定于所述柔性显示面板的背面；
    所述第一固定部件位于所述形变单元的中心，用于同时固定所述四个支部的一端；
    所述四个第二固定部件分别位于所述形变单元的四个边缘，用于分别固定所述四个支部的另一端。
  5. 根据权利要求4所述的柔性显示屏，其中，所述第一固定部件包括一个矩形固定面以及位于所述固定面四个角的固定柱；
    所述四个支部的一端分别通过相邻的两个所述固定柱之间的空隙区域嵌入所述固定面的下方。
  6. 根据权利要求4所述的柔性显示屏，其中，所述第二固定部件包括顶面以及侧壁；
    支部的另一端嵌入由所述顶面和所述侧壁围成的空间区域内。
  7. 根据权利要求4所述的柔性显示屏，其中，所述第一固定部件和所述第二固定部件通过胶结方式固定于所述柔性显示面板的背面。
  8. 根据权利要求2所述的柔性显示屏，其中，所述形变单元的支部包括压电材料层。
  9. 根据权利要求8所述的柔性显示屏，其中，每个支部为一个压 电陶瓷双晶片。
  10. 根据权利要求1-9任一项所述的柔性显示屏，其中，所述柔性显示面板为柔性OLED显示面板。
  11. 一种显示装置，其包括权利要求1-10任一项所述的柔性显示屏。
  12. 根据权利要求11所述的显示装置，其中，所述显示装置包括柔性电路板；
    形变驱动器中每个形变单元的供电导线连接至所述柔性电路板。
  13. 如权利要求1-10任一项所述柔性显示屏的变形驱动方法，其包括如下步骤：分别向形变驱动器的各形变单元施加电压，以驱动所述柔性显示面板变形。
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