WO2018152970A1 - 一种显示器及其柔性显示屏的平展方法 - Google Patents

一种显示器及其柔性显示屏的平展方法 Download PDF

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Publication number
WO2018152970A1
WO2018152970A1 PCT/CN2017/083089 CN2017083089W WO2018152970A1 WO 2018152970 A1 WO2018152970 A1 WO 2018152970A1 CN 2017083089 W CN2017083089 W CN 2017083089W WO 2018152970 A1 WO2018152970 A1 WO 2018152970A1
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Prior art keywords
actuator
stress
flexible display
display screen
wing portion
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PCT/CN2017/083089
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English (en)
French (fr)
Inventor
陈继峯
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武汉华星光电技术有限公司
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Priority to US15/544,518 priority Critical patent/US10175719B2/en
Publication of WO2018152970A1 publication Critical patent/WO2018152970A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1615—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function
    • G06F1/1616—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • G06F1/1618—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position the display being foldable up to the back of the other housing with a single degree of freedom, e.g. by 360° rotation over the axis defined by the rear edge of the base enclosure
    • 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
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • 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
    • G06F1/1641—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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • 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
    • G06F1/1675—Miscellaneous details related to the relative movement between the different enclosures or enclosure parts
    • G06F1/1677—Miscellaneous details related to the relative movement between the different enclosures or enclosure parts for detecting open or closed state or particular intermediate positions assumed by movable parts of the enclosure, e.g. detection of display lid position with respect to main body in a laptop, detection of opening of the cover of battery compartment
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • 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
    • G06F1/1675—Miscellaneous details related to the relative movement between the different enclosures or enclosure parts
    • G06F1/1681—Details related solely to hinges
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0217—Mechanical details of casings

Definitions

  • the invention belongs to the technical field of displays, and in particular to a flexible display.
  • the multi-layer organic plastic film is stacked and laminated, and has the advantages of being bendable and curled, so that the response time is short, the contrast is high, the wide viewing angle, the wide color gamut, and the display panel are light and thin.
  • bendability are achieved.
  • the bendability of OLED display panels has brought consumers a subversive concept, so Flexible (flexible) OLEDs have been the mainstream of the industry in recent years.
  • the present invention hopes to solve the problem of flattening after folding of the flexible display screen by using a mechanical structure in combination with a stress sensing scheme.
  • Such a display includes a flexible display screen and a folded outer casing for carrying the flexible display screen; and further includes stress sensing disposed on the flexible display screen bending frequent area for detecting a strain state of the flexible display screen system;
  • the folded outer casing includes: a first wing portion and a second wing portion, and a hinge connected between the first wing portion and the second wing portion; and, in mirror symmetry, and respectively associated with the stress sensing a first actuator and a second actuator connected to the system, the first actuator and the second actuator being respectively disposed corresponding to the first a wing portion, a bottom portion of the second wing portion;
  • the flexible display screen protrudes from the first wing portion, the second wing portion, and is coupled to the first actuator and the second actuator; the first actuator and the second actuator.
  • the traction force is applied to the first end portion and the second end portion according to the stress information detected by the stress sensing system to completely affix the flexible display screen to the surface of the folded outer casing.
  • the stress sensing system includes a stress sensor and a controller, the controller being respectively connected to the first actuator, the second actuator, the stress sensor, and the controller is used for Driving the stress sensor to detect and receive the stress information, calculating the traction force value according to the stress information, and finally driving the first actuator and the second actuator to activate to fully affix the flexible display to the flexible sensor The folded outer casing.
  • the first wing portion and the second wing portion are relatively rotated about the hinge member, and the first wing portion and the second wing portion form a dihedral angle ⁇ of 0-360°.
  • the first actuator comprises: a first actuation motor and a first elastic pusher connected to the first actuation motor;
  • the second actuator comprises: a second actuation motor and a second elastic pushing member connected to the second actuating motor; the first end portion and the second end portion are respectively connected to the first elastic pushing member free end and the second elastic pushing member free end.
  • the first end portion and the second end portion are respectively connected to the first elastic pusher free end and the second elastic pusher free end by a double-sided tape.
  • the folding outer casing further includes a first bottom cover and a second bottom cover; the first bottom cover is correspondingly engaged with the first wing, and the first actuator is clamped to the first Between the bottom cover and the first wing portion; the second bottom cover is correspondingly engaged with the second wing portion, and the second actuator is clamped to the second bottom cover and the first Between the two wings.
  • the invention also provides a flattening method for such a flexible display screen, comprising the following steps:
  • Step S1 starts the controller
  • Step S2 the controller drives the stress sensor to detect the stress F of the flexible display screen, and receives the stress information fed back by the stress sensor;
  • step S3 the controller compares the stress information with a stress rating H preset inside the controller:
  • the controller calculates that the detected stress F magnitude is greater than the stress rating H, F>H, then calculate the traction force F' value required to fully flatten the flexible display screen;
  • Step S4 the controller feeds back the traction force F' value to the first brake and the second brake, and drives the first actuator and the second actuator to simultaneously apply a traction force F' to the flexible display screen, so that the flexible display The screen is completely flat.
  • the invention connects a stress sensing system on the flexible display screen, combines the mechanical structure, obtains the optimal traction force against the stress with the aid of a precise stress sensing system, and then applies it to the bent flexible display screen, so that the traction force is
  • the controllable, accurate, and reliable can be adjusted in time according to the deformation recovery situation after the flat display of the flexible display screen is flattened.
  • FIG. 1 is a schematic structural view of a display according to an embodiment of the present invention.
  • FIG. 2 is another schematic structural view of a display according to an embodiment of the present invention.
  • FIG. 3 is another schematic structural view of a display according to an embodiment of the present invention.
  • FIG. 4 is a partial structural schematic view of a flexible display panel according to an embodiment of the present invention.
  • Figure 5 is a flow diagram of a display flat flexible display in accordance with an embodiment of the present invention.
  • the present invention provides a display, as shown in FIG. 1, that includes a flexible display screen 10 and a folded outer casing 20 for carrying the flexible display screen 10, and a stress sensing system.
  • the folded outer casing 20 includes at least a first wing portion 21 and a second wing portion 22, and a hinge member 23 coupled between the first wing portion 21 and the second wing portion 22.
  • a first actuator 31 and a second actuator 32 that are mirror-symmetrically disposed at the bottom of the first wing portion 21 and the second wing portion 22.
  • the flexible display screen of this embodiment has a rectangular shape with opposite long sides and two opposite short sides. By using the flexible display's bendability, the two short sides are overlapped, and the flexible display is folded in half, thereby changing the size of the display.
  • This embodiment exemplarily adjusts the size of the flexible display screen in the above manner.
  • the opposite short sides of the flexible display screen are defined as a first end portion 11 and a second end portion 12, respectively. .
  • the first end portion 11 and the second end portion 12 respectively protrude from the first wing portion 21 and the second wing portion 22, and simultaneously with the first actuator 31 and the second actuator 32, respectively. connection.
  • the first wing portion 21 and the second wing portion 22 are rotatable relative to the hinge member 23 like a "two-wing", and the first wing portion 21 and the second wing portion 22 are formed.
  • the dihedral angle ⁇ is 0 to 360°.
  • the dihedral angle ⁇ formed by the first wing portion 21 and the second wing portion 22 is 180°, the first wing portion, the second wing portion and the hinge member are located on the same horizontal plane, and the folded outer casing 20 is at The flat state: the first wing portion 21, the second wing portion 22 and the hinge member 23 are combined into a flat bearing plane 10A capable of carrying the flexible display screen flatly on the bearing plane 10A.
  • the folding outer casing 20 can have other shapes.
  • the first actuator 31 and the second actuator 32 of the present embodiment are respectively disposed at the bottom of the first wing portion 21 and the second wing portion 22, and are mirror symmetrical. .
  • the actuator has a variety of configurations.
  • the exemplary first actuator 31 of the present embodiment includes a first actuation motor 311 and a first elastic pusher 312 coupled to the first actuation motor 311.
  • the first elastic pushing member 312 includes a first pushing shaft 313 coupled to the first actuation motor 311, and a first connection to the bottom of the first end portion 11 and corresponding to the first pushing shaft 313
  • the movable portion 314 is connected to the first actuation motor via a first coil spring 315 disposed on the first push shaft 313.
  • the first actuating motor 311 is a stepping motor.
  • the first pushing shaft 313 Under the driving of the first actuating motor 311, the first pushing shaft 313 can move back and forth relative to the single axis in a stepwise manner, and at the same time, the first coil spring 315 is elastically deformed.
  • the first movable portion 314 is pushed or pulled by the first coil spring 315 such that the first movable portion 314 is displaced away from or close to the first wing portion 11.
  • the first push shaft 314 is sleeved in the first coil spring 315 to form a supporting and guiding action on the first coil spring 315.
  • the second actuator 32 includes a second actuation motor 321 and a second resilient pusher 322 coupled to the second actuation motor 321 .
  • the second elastic pushing member 322 includes a second pushing shaft 323 coupled to the second actuation motor 321, and a second portion connected to the bottom of the second end portion 12 and corresponding to the second pushing shaft 323.
  • the movable portion 324 is connected to the second actuation motor 321 via a second coil spring 325 disposed on the second push shaft 323.
  • the structure and working principle of the second elastic pushing member 322 are shown in the first elastic pushing member 312, and details are not described herein again.
  • first actuation motor 311 and the second actuation motor 321 drive the first elastic pusher 312 and the second elastic pusher 322 to move outside the folded outer casing 20, or at the same time, the middle of the folded outer casing is contracted. This action produces a pulling force on both ends of the flexible display, prompting a rapid change in the state of the flexible display.
  • the first end portion and the second end portion are respectively connected to the first elastic pusher free end and the second elastic pusher free end by a double-sided tape (not shown).
  • the folding outer casing 20 further includes a first bottom cover 24 and a second bottom cover 25; the first bottom cover 24 and the first wing portion 21
  • the first actuator 31 is clamped between the first bottom cover 24 and the first wing portion 21 corresponding to the fastening.
  • the second bottom cover 25 is correspondingly engaged with the second wing portion 22, and the second actuator 32 is clamped between the second bottom cover 25 and the second wing portion 22. between.
  • the flexible display screen 10 attached to the bearing curved surface 10B cannot be immediately restored after being bent for a long time and bent for a long time.
  • the level of complete flatness in particular, will form a distinct undulating projection in the corresponding portion of the hinge member 23, as shown in FIG.
  • a mechanical structure can be utilized to solve the above problem, and the first actuator 31 and the second actuator 32 apply traction force to the first end portion 11 and the second end portion 12 to enable the flexible display screen 10 to The long axis direction is stretched and finally completely adhered to the surface of the folded outer casing 20.
  • the mechanical structure of the embodiment can restore the flatness of the flexible display screen relatively quickly, but it is also difficult to control the magnitude of the applied traction force, which easily leads to: either the traction force is insufficient, the flexible display screen has not reached a completely flat state; or the traction force is too large The flexible display is always stretched.
  • a stress sensing system for detecting the strain state of the flexible display screen is further provided.
  • the stress sensing system of the present embodiment includes a stress sensor 40 and a controller 50.
  • the stress sensor 40 is distributed at a position where the flexible display screen 10 is bent most frequently (especially the middle portion corresponding to the hinge member 23) for detecting the bending deformation of the flexible display screen and the bending received in time. The amount of folding stress.
  • the flexible display corresponds to the area where the hinge is the most frequently bent area.
  • the Strain Sensor can be grown on the flexible substrate in the flexible display before forming the device; or the display can be made. When the array is driven, it is made together.
  • a controller is also provided on the display to connect to the flexible display.
  • the controller 50 is also disposed in connection with the stress sensor 40, and the controller 50 drives the stress sensor 40 to operate.
  • step S1 starts the controller 50.
  • step S2 the controller 50 drives the stress sensor 40 to detect the stress F of the flexible display screen 10 and receives the stress information fed back by the stress sensor.
  • step S3 the controller 50 compares the stress information with the stress rating H preset inside the controller.
  • the controller 50 calculates that the detected stress F is not greater than the stress rating H (F ⁇ H), it is considered that the flexible display is in a flat state or its bending degree is in a normal range, and the controller process is terminated; if the controller 50 Calculating that the magnitude of the detected stress F is greater than the stress rating (F > H), the flexible display is considered to be in a bent state, and the traction force F' value required to fully flatten the flexible display screen is calculated. At this point, the process proceeds to step S4.
  • step S4 the traction force F' value is fed back to the first brake and the second brake, and the first actuator and the second actuator are driven to start at the same time, and the flexible display screen is stretched in the left and right directions, and finally Make the flexible display completely flat.
  • the controller drives the stress sensor to continuously update the stress information, and repeats steps S2 to S4 to continuously optimize the first actuator and the second actuator.
  • the traction force F' value applied by the actuator ultimately makes the flexible display screen completely flat and does not suffer from the excessive stretching of the desired situation.
  • the stress sensor of this embodiment can be disposed on a region where the flexible display screen is bent frequently, or can be disposed on the folded outer casing corresponding to a region where the flexible display screen is frequently bent, for example, a hinge. It is also possible to achieve the object of the present invention.

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Abstract

一种显示器，包括柔性显示屏（10）以及用于承载柔性显示屏（10）的折叠外壳（20）；还包括设置于柔性显示屏（10）弯折频繁区、用于检测柔性显示屏（10）的应变状态的应力感测系统；柔性显示屏（10）突伸于折叠外壳（20）外、并与折叠外壳（20）上的第一致动器（31）、第二致动器（32）连接；第一致动器（31）、第二致动器（32）根据应力感测系统检测的应力信息对第一端部（11）、第二端部（12）施加牵引力使柔性显示屏（10）完全贴覆于折叠外壳（20）表面。利用应力感测系统和机械结构的结合，实现对柔性显示屏（10）的牵引力可调可控，达到柔性显示屏（10）平铺于折叠外壳（20）上的理想状态。

Description

一种显示器及其柔性显示屏的平展方法 技术领域
本发明属于显示器技术领域，具体地讲，涉及一种柔性显示器。
背景技术
随着OLED显示技术的发展日趋成熟，广大消费者体验到了OLED显示与传统LCD显示的巨大差异，随之而来的是OLED消费市场的迅速增长。由于OLED柔性显示器自发光的特性，采用多层有机塑胶薄膜堆叠贴合而成，具有可弯折、卷曲的优点，使得响应时间短、高对比度、广视角、广色域、显示面板轻薄化、可弯折性等特点得以实现。特别是OLED显示面板的可弯折性，给消费者带来了颠覆性的概念，因此Flexible(可弯折)OLED近年来是行业发展的主流。
然而，经实验结果发现，柔性显示器在大曲率、长时间弯折后，再平摊于外壳表面会形成明显的褶痕，无法立即恢复到完全平整的水准。初步研究结果显示为：是柔性显示屏内部光学胶(OCA胶)的潜变(Creep)现象所造成。这种OCA胶的非弹性行为，目前尚未找到合适的替代材料可以解决此项问题。
发明内容
为了解决上述现有技术存在的问题，本发明希望利用机械结构结合应力感测方案解决柔性显示屏折叠后平展的问题。
这种显示器，包括柔性显示屏以及用于承载所述柔性显示屏的折叠外壳；还包括设置于所述柔性显示屏弯折频繁区、用于检测所述柔性显示屏的应变状态的应力感测系统；
所述折叠外壳包括：第一翼部和第二翼部，以及连接于所述第一翼部和第二翼部之间的铰接件；以及，呈镜像对称、且分别与所述应力感测系统连接的第一致动器和第二致动器，第一致动器和第二致动器分别对应设置于所述第一 翼部、所述第二翼部底部；
所述柔性显示屏突伸于所述第一翼部、第二翼部外、并与所述第一致动器、第二致动器连接；所述第一致动器、第二致动器根据所述应力感测系统检测的应力信息对所述第一端部、第二端部施加牵引力使所述柔性显示屏完全贴覆于所述折叠外壳表面。
其中，所述应力感测系统包括应力感测器和控制器，所述控制器分别与所述第一致动器、第二致动器、所述应力感测器连接，所述控制器用于驱动所述应力感测器检测、并接收所述应力信息，根据所述应力信息计算所述牵引力值，最后驱动所述第一致动器、第二致动器启动使柔性显示器完全贴覆于所述折叠外壳上。
其中，所述第一翼部、第二翼部绕所述铰接件相对转动，所述第一翼部、第二翼部形成的二面角θ为0～360°。
其中，所述第一致动器包括：第一致动马达以及与所述第一致动马达相连的第一弹性推件；所述第二致动器包括：第二致动马达以及与所述第二致动马达相连的第二弹性推件；所述第一端部、第二端部分别与所述第一弹性推件自由端、第二弹性推件自由端连接。
其中，所述第一端部、第二端部分别通过双面胶与所述第一弹性推件自由端、第二弹性推件自由端连接。
其中，所述折叠外壳还包括第一底盖、第二底盖；所述第一底盖与所述第一翼部对应扣合，将所述第一致动器夹持于所述第一底盖与所述第一翼部之间；所述第二底盖与所述第二翼部对应扣合，将所述第二致动器夹持于所述第二底盖与所述第二翼部之间。
本发明还提供这种柔性显示屏的平展方法，包括如下步骤：
步骤S1启动控制器；
步骤S2，控制器驱动所述应力感测器对柔性显示屏所受应力F进行检测，并接收应力感测器反馈的应力信息；
步骤S3，控制器根据所述应力信息与预设于控制器内部的应力额定值H相比较：
若控制器计算到检测的应力F大小不大于所述应力额定值H，F≤H，则控制器处理终止；
若控制器计算到检测的应力F大小大于所述应力额定值H，F＞H，则计算能够使柔性显示屏完全平展所需要的牵引力F’值；
步骤S4，控制器将该牵引力F’值反馈给第一制动器、第二制动器，驱动所述第一致动器、第二致动器同时向所述柔性显示屏施加牵引力F’，使得柔性显示屏完全平展。
有益效果：
本发明在柔性显示屏上连接一应力感测系统，结合机械结构、在精密的应力感测系统辅助下获得抵抗应力的最佳牵引力，再施加到弯折的柔性显示屏上，使得该牵引力是可控可调、精确可靠的，能够根据柔性显示屏弯折区摊平后的形变恢复情形来及时调整。
附图说明
通过结合附图进行的以下描述，本发明的实施例的上述和其它方面、特点和优点将变得更加清楚，附图中：
图1是本发明实施例的显示器结构示意图；
图2是本发明实施例的显示器又一结构示意图；
图3是本发明实施例的显示器另一结构示意图；
图4是本发明实施例的柔性显示面板的局部结构示意图；
图5是本发明实施例的显示器平展柔性显示器的流程图。
具体实施方式
以下，将参照附图来详细描述本发明的实施例。然而，可以以许多不同的 形式来实施本发明，并且本发明不应该被解释为限制于这里阐述的具体实施例。相反，提供这些实施例是为了解释本发明的原理及其实际应用，从而使本领域的其他技术人员能够理解本发明的各种实施例和适合于特定预期应用的各种修改。
本发明提供一种显示器，如图1所示，其包括柔性显示屏10以及用于承载所述柔性显示屏10的折叠外壳20、和应力感测系统。所述折叠外壳20至少包括：第一翼部21和第二翼部22，以及连接于所述第一翼部21和第二翼部22之间的铰接件23。以及呈镜像对称设置于所述第一翼部21、第二翼部22底部的第一致动器31和第二致动器32。
本实施例的柔性显示屏呈矩形，其具有相对的两条长侧边、以及相对的两条短侧边。利用柔性显示屏的可弯折性，将两短侧边重合、使柔性显示屏对折，从而改变显示屏的尺寸大小。本实施例示例性地采用上述方式调整柔性显示屏的大小，为了更清楚说明本实施例的技术方案，定义柔性显示屏的相对两短侧边分别为第一端部11、第二端部12。所述第一端部11、第二端12部分别突伸于所述第一翼部21、第二翼部22外，同时分别与所述第一致动器31、第二致动器32连接。
结合图2、图3所示，第一翼部21、第二翼部22能够绕所述铰接件23像“双翼”般相对转动，所述第一翼部21、第二翼部22形成的二面角θ为0～360°。当第一翼部21、第二翼部22形成的二面角θ为180°时，所述第一翼部、第二翼部和所述铰接件位于同一水平面上，所述折叠外壳20处于平展状态：所述第一翼部21、第二翼部22和所述铰接件23组合成一平整的承载平面10A，能够承载所述柔性显示屏平整贴覆于承载平面10A上。
当第一翼部21、第二翼部22形成的二面角θ为360°时，第一翼部21、第二翼部22的底面相对，使得第一翼部21、第二翼部22重合在一起，连同铰接件23形成一呈“U型”的承载曲面10B，此时折叠外壳20处于折合状态，柔性显示屏10包覆于所述承载曲面10B上。
当然，由于第一翼部21、第二翼部22能够绕所述铰接件23在360°相对转动，使得折叠外壳20还可以具有其他造型。
如图1、图2所示，本实施例的第一致动器31和第二致动器32分别对应设置于所述第一翼部21、所述第二翼部22底部，呈镜像对称。
致动器具有多种构型。本实施例示例性的第一致动器31包括：第一致动马达311以及与所述第一致动马达311相连的第一弹性推件312。第一弹性推件312包括连接于所述第一致动马达311上的第一推送轴313，以及连接于所述第一端部11底部，并与所述第一推送轴313对应的第一活动部314，所述第一活动部314通过一套于所述第一推送轴313上的第一螺旋弹簧315与所述第一致动马达连接。第一致动马达311为步进式马达，在第一致动马达311的驱动下，第一推送轴313可以步进式相对单轴往返运动，同时使所述第一螺旋弹簧315产生弹性形变，由第一螺旋弹簧315对第一活动部314的推压或拉收，使得第一活动部314发生远离或靠近第一翼部11的位移。第一推送轴314穿套于所述第一螺旋弹簧315中，能够对第一螺旋弹簧315形成支撑和导向作用。
类似地，所述第二致动器32包括：第二致动马达321以及与所述第二致动马达321相连的第二弹性推件322。第二弹性推件322包括连接于所述第二致动马达321上的第二推送轴323，以及连接于所述第二端部12底部，并与所述第二推送轴323对应的第二活动部324，所述第二活动部324通过一套于所述第二推送轴323上的第二螺旋弹簧325与所述第二致动马达321连接。第二弹性推件322的结构和工作原理参见第一弹性推件312所示，在此不再赘述。
当第一致动马达311、第二致动马达321驱动第一弹性推件312、第二弹性推件322同时向折叠外壳20外移动，或者，同时向折叠外壳中部紧缩。该动作能对柔性显示屏的两端产生牵引作用力，促使柔性显示屏状态迅速改变。
其中，所述第一端部、第二端部分别通过双面胶(图中未示出)与所述第一弹性推件自由端、第二弹性推件自由端连接。
为了对第一致动器、第二致动器进行保护，所述折叠外壳20还包括第一底盖24、第二底盖25；所述第一底盖24与所述第一翼部21对应扣合，将所述第一致动器31夹持于所述第一底盖24与所述第一翼部21之间。类似地，所述第二底盖25与所述第二翼部22对应扣合，将所述第二致动器32夹持于所述第二底盖25与所述第二翼部22之间。
当所述折叠外壳20从其他状态(例如，折合状态)变换至平展状态时，贴覆于所述承载曲面10B上的柔性显示屏10由于在大曲率、长时间弯折后，无法立即恢复到完全平整的水准，尤其会在铰接件23对应的部分形成明显的波浪形凸起，如图2所示。可利用机械结构来解决上述问题，所述第一致动器31、第二致动器32对所述第一端部11、第二端部12施加牵引力，使所述柔性显示屏10能够沿长轴方向拉伸，最后完全贴覆于所述折叠外壳20表面。
但是，本实施例的机械结构能够较快地恢复柔性显示屏的平坦，但也难以控制施加的牵引力大小，容易导致：要么牵引力不够，柔性显示屏还没有达到完全平坦的状态；要么牵引力过大，柔性显示屏一直处于被拉伸的状态。
故此，进一步，本实施例中，还提供一用于检测所述柔性显示屏的应变状态的应力感测系统。结合图4所示，本实施例的应力感测系统包括应力感测器40和控制器50。所述应力感测器40分布于所述柔性显示屏10弯曲最为频繁的位置(尤其是与所述铰接件23对应的中部)用于及时检测柔性显示屏弯折形变的情况、所受的弯折应力大小。柔性显示屏对应于铰接件的区域是弯折最为频繁的区域，应力感测器(Strain Sensor)可为事先成长于柔性显示屏中软性基板上，然后再形成其器件；或者可以在制作显示屏驱动阵列(Array)时就一起制作。
显示器上还设置有控制器与柔性显示器相连。为了增强所述应力感测器的性能，该控制器50也设置为与所述应力感测器40连接，由控制器50驱动应力感测器40工作。
下面，介绍本显示器的工作流程。结合图5所示，当折叠外壳20状态变换完成后，例如从折合状态变换为平展状态，步骤S1启动控制器50。步骤S2，控制器50驱动所述应力感测器40对柔性显示屏10所受应力F进行检测，并接收应力感测器反馈的应力信息。此时进入步骤S3：控制器50根据所述应力信息与预设于控制器内部的应力额定值H相比较。若控制器50计算到检测的应力F大小不大于所述应力额定值H(F≤H)，则认为柔性显示屏为平展状态或其弯折程度处于正常范围，控制器处理终止；若控制器50计算到检测的应力F大小大于所述应力额定值(F＞H)，则认为柔性显示屏处于弯折状态，计算能够使柔性显示屏完全平展所需要的牵引力F’值。此时进入步骤S4。在步 骤S4中，将该牵引力F’值反馈给第一制动器、第二制动器，驱动所述第一致动器、第二致动器同时启动，带动柔性显示屏往左右两方向进行拉伸，最终使得柔性显示屏完全平展。
优选地，在第一致动器、第二致动器不断拉伸过程中，控制器驱动应力感测器不断更新应力信息，重复步骤S2～S4，不断优化第一致动器、第二致动器施加的牵引力F’值，最终使柔性显示屏完全处于平展状态，且不会被过分拉伸的理想态势。
本实施例的应力感测器可以集中布设在柔性显示屏弯折频繁的区域上，也可以对应于柔性显示屏弯折频繁的区域而布设在折叠外壳上，例如，铰接件上。同样是能够实现本发明目的的。
虽然已经参照特定实施例示出并描述了本发明，但是本领域的技术人员将理解：在不脱离由权利要求及其等同物限定的本发明的精神和范围的情况下，可在此进行形式和细节上的各种变化。

Claims (8)

  1. 一种显示器，包括柔性显示屏以及用于承载所述柔性显示屏的折叠外壳；其中，还包括设置于所述柔性显示屏弯折频繁区、用于检测所述柔性显示屏的应变状态的应力感测系统；
    所述折叠外壳包括：第一翼部和第二翼部，以及连接于所述第一翼部和第二翼部之间的铰接件；以及，呈镜像对称、且分别与所述应力感测系统连接的第一致动器和第二致动器，第一致动器和第二致动器分别对应设置于所述第一翼部、所述第二翼部底部；
    所述柔性显示屏突伸于所述第一翼部、第二翼部外、并与所述第一致动器、第二致动器连接；所述第一致动器、第二致动器根据所述应力感测系统检测的应力信息对所述第一端部、第二端部施加牵引力使所述柔性显示屏完全贴覆于所述折叠外壳表面。
  2. 根据权利要求1所述显示器，其中，至少具有所述第一翼部、第二翼部和所述铰接件位于同一水平面上，使所述折叠外壳至少具有平展状态。
  3. 根据权利要求2所述显示器，其中，所述应力感测系统包括应力感测器和控制器，所述控制器分别与所述第一致动器、第二致动器、所述应力感测器连接，所述控制器用于驱动所述应力感测器检测、并接收所述应力信息，根据所述应力信息计算所述牵引力值，最后驱动所述第一致动器、第二致动器启动使柔性显示器完全贴覆于所述折叠外壳上。
  4. 根据权利要求1所述显示器，其中，所述第一翼部、第二翼部绕所述铰接件相对转动，所述第一翼部、第二翼部形成的二面角θ为0～360°。
  5. 根据权利要求1所述显示器，其中，所述第一致动器包括：第一致动马达以及与所述第一致动马达相连的第一弹性推件；所述第二致动器包括：第二致动马达以及与所述第二致动马达相连的第二弹性推件；所述第一端部、第二端部分别与所述第一弹性推件自由端、第二弹性推件自由端连接。
  6. 根据权利要求5所述显示器，其中，所述第一端部、第二端部分别通 过双面胶与所述第一弹性推件自由端、第二弹性推件自由端连接。
  7. 根据权利要求1所述显示器，其中，所述折叠外壳还包括第一底盖、第二底盖；所述第一底盖与所述第一翼部对应扣合，将所述第一致动器夹持于所述第一底盖与所述第一翼部之间；所述第二底盖与所述第二翼部对应扣合，将所述第二致动器夹持于所述第二底盖与所述第二翼部之间。
  8. 一种根据权利要求3所述柔性显示屏的平展方法，其中，包括如下步骤：
    步骤S1，启动控制器；
    步骤S2，控制器驱动所述应力感测器对柔性显示屏所受应力F进行检测，并接收应力感测器反馈的应力信息；
    步骤S3，控制器根据所述应力信息与预设于控制器内部的应力额定值H相比较：
    若控制器计算到检测的应力F大小不大于所述应力额定值H，F≤H，则控制器处理终止；
    若控制器计算到检测的应力F大小大于所述应力额定值H，F＞H，则计算能够使柔性显示屏完全平展所需要的牵引力F’值；
    步骤S4，控制器将该牵引力F’值反馈给第一制动器、第二制动器，驱动所述第一致动器、第二致动器同时向所述柔性显示屏施加牵引力F’，使得柔性显示屏完全平展。
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