WO2019237485A1 - 电子装置及其柔性显示装置 - Google Patents

电子装置及其柔性显示装置 Download PDF

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Publication number
WO2019237485A1
WO2019237485A1 PCT/CN2018/099720 CN2018099720W WO2019237485A1 WO 2019237485 A1 WO2019237485 A1 WO 2019237485A1 CN 2018099720 W CN2018099720 W CN 2018099720W WO 2019237485 A1 WO2019237485 A1 WO 2019237485A1
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WO
WIPO (PCT)
Prior art keywords
sheet
display device
flexible display
flexible
screen
Prior art date
Application number
PCT/CN2018/099720
Other languages
English (en)
French (fr)
Inventor
刘亮
施文杰
张琨
陈松亚
Original Assignee
深圳市柔宇科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市柔宇科技有限公司 filed Critical 深圳市柔宇科技有限公司
Priority to CN201880093894.XA priority Critical patent/CN112602034A/zh
Publication of WO2019237485A1 publication Critical patent/WO2019237485A1/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
    • 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
    • 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

Definitions

  • the present application relates to the field of display devices of electronic devices, and in particular, to a flexible display device and an electronic device provided with the flexible display device.
  • the present application provides a flexible display device capable of preventing damage to a flexible screen, and an electronic device provided with the flexible display device.
  • a flexible display device provided by the present application includes a flexible screen, and a protective sheet made of a bending-resistant material is laminated on a back surface of the flexible screen.
  • the flexible screen is provided with a foldable area, and the protective sheet covers a flexible screen.
  • the flexible screen includes a screen body layer, and the protective sheet is used to support the screen body layer.
  • the present application also provides an electronic device including a housing and a flexible display device.
  • the housing includes a first frame body, a second frame body, and a hinge connected between the first frame body and the second frame body.
  • the flexible display device is disposed on the first frame body, the second frame body, and the hinge.
  • the flexible display device includes a flexible screen, and a back surface of the flexible screen is laminated with a material resistant to bending.
  • a protective sheet, the flexible screen is provided with a bendable region, the protective sheet covers the bendable region, the flexible screen includes a screen body layer, and the protection sheet is used to support the screen body layer.
  • a protective sheet is provided on the back of the flexible screen of the electronic device, and the screen body layer of the flexible screen is located at the neutral layer of the flexible display device. Therefore, when the electronic device is bent or flattened through the hinge, the protective sheet has a function of protecting the flexible screen, and the screen body layer receives less stress, which improves the screen body layer. Bending resistance increases the service life of the flexible screen.
  • FIG. 1 is a schematic three-dimensional structure diagram of an electronic device in a first embodiment of the present application.
  • FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1.
  • FIG. 3 is a partial cross-sectional structure diagram of an electronic device in a second embodiment of the present application.
  • FIG. 4 is an enlarged view of a portion IV in FIG. 3.
  • FIG. 5 is a partial cross-sectional structure diagram of an electronic device in a third embodiment of the present application.
  • FIG. 6 is an enlarged view of a VI portion in FIG. 5.
  • FIG. 7 is a partial cross-sectional structure diagram of an electronic device in a fourth embodiment of the present application.
  • FIG. 8 is an enlarged view of a portion VIII in FIG. 7.
  • FIG. 9 is a partial cross-sectional structure diagram of an electronic device in a fifth embodiment of the present application.
  • FIG. 10 is an enlarged view of a portion X in FIG. 9.
  • FIG. 11 is a partial cross-sectional structural diagram of an electronic device in a sixth embodiment of the present application.
  • FIG. 12 is a partial cross-sectional structure diagram of an electronic device in a seventh embodiment of the present application.
  • FIG. 13 is a schematic front structural diagram of an electronic device in an eighth embodiment of the present application.
  • FIG. 14 is a schematic diagram of a front structure of an electronic device in a ninth embodiment of the present application.
  • FIG. 15 is a schematic front structural diagram of an electronic device in a tenth embodiment of the present application.
  • FIG. 1 is a schematic diagram of the three-dimensional structure of the electronic device in the first embodiment of the present application
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1.
  • the electronic device 100 in the first embodiment of the present application includes a casing 20 and a flexible display device 30 disposed on the casing 20.
  • the housing 20 includes a first frame body 21, a second frame body 23, and a hinge 25 connected between the first frame body 21 and the second frame body 23.
  • the flexible display device 30 is disposed on the first frame body 21, the second frame body 23 and the hinge 25.
  • the flexible display device 30 is provided with a bendable area 31 corresponding to the hinge 25 and a non-bendable area connected to the bendable area 31.
  • the flexible display device 30 includes a flexible screen 32 and a protective sheet 34 disposed on the back of the flexible screen 32.
  • the protection sheet 34 covers the bendable area 31.
  • the flexible screen 32 includes a screen body layer 322.
  • the protection sheet 34 is disposed on the back of the screen body layer 322.
  • the protection sheet 34 is used to support and protect the flexible screen 32 to improve the flexible screen.
  • 32 is rigid and prevents the back surface of the flexible screen 32 from abrasion.
  • the screen body layer 322 is a main body for displaying an image.
  • the protective sheet 34 may be a silicon gel, a foam, a thin metal sheet such as a copper foil, a liquid metal sheet, a memory alloy, or other compatible materials. More preferably, a liquid metal sheet is used.
  • the liquid metal sheet may be an alloy of one or more of copper, titanium, iron, zirconium, silver, nickel, gallium, gold, antimony, cadmium, zinc, indium, silicon, and the like. Materials, specifically metals, can preferably achieve lower elastic modulus, hardness, elongation and other mechanical properties.
  • the front surface of the protection sheet 34 is fixedly attached to the back surface of the flexible screen 32 through a gel, and the back surface of the protection sheet 34 and the hinge 25 can slide relative to each other.
  • the flexible display device 30 When the electronic device 100 is bent through the hinge 25, the flexible display device 30 is bent along the bendable area 31, and the protective sheet 34 slides relative to the hinge 25.
  • the screen body layer 322 is located at a neutral layer position of the flexible display device 30 to improve the bending resistance of the screen body layer 322.
  • the front side of the flexible screen 32 refers to a light emitting surface of the flexible screen 32, and the back side of the flexible screen 32 refers to a surface facing away from the light emitting surface.
  • the neutral layer refers to a process in which the flexible display device 30 is bent, the outer layer of the flexible display device 30 is stretched, the inner layer of the flexible display device 30 is squeezed, and a cross section is not stretched.
  • the transition layer is stretched without being squeezed, and the stress of the transition layer is small, and the transition layer is a neutral layer.
  • the screen body layer 322 in this application is located on the neutral layer to improve the bending resistance of the screen body layer 322.
  • the liquid metal referred to in this application refers to heating the alloy to a molten state, and then cooling it at an ultra-fast cooling rate, so that the alloy crystal lattice solidifies before it can be arranged in order. Because it is in an amorphous state, like glass, it is also called non- Crystal alloy, liquid metal or metallic glass.
  • the characteristics of liquid metal are long-range disorder (short-range order), metastable state, to some extent isotropic physical properties, no exact melting point, glass transition temperature point, etc., which has the characteristics of solid, metal, and glass. Under certain conditions, it has high strength, high hardness, plasticity, heat conduction and wear resistance. That is, the liquid metal referred to in the present invention is substantially solid at normal temperature, but some of its characteristics are close to liquid, so it is called liquid metal.
  • the liquid metal sheet has better abrasion resistance.
  • the liquid metal sheet can not only support the flexible screen 32, but also can effectively resist the friction caused by the hinge 25, and it is not easy to wear.
  • the liquid metal sheet has a low modulus of elasticity, and can be directly pasted on the back of the flexible screen 32.
  • the flexible display device 30 When the flexible display device 30 is bent, it can be stretched along with the flexible screen 32 simultaneously or approximately synchronously, thereby avoiding flexible display. When the device 30 is bent, it may be damaged due to a large difference in the stretching amplitude.
  • the strength of liquid metal is higher, and the abrasion resistance is better, which can effectively resist Flexible screen for support.
  • the protective sheet 34 may be entirely attached to the entire back surface of the flexible screen 32, or may be attached only to the bendable area 31 on the back of the flexible screen 32, that is, the protective sheet is attached only to the bendable area 31 on the back of the flexible screen 32 34.
  • the non-curved area has no protective sheet 34 distributed to save the manufacturing cost of the flexible display device 30.
  • the protective sheet 34 covers the non-bent area of the back of the flexible screen 32. This full-coverage method can avoid the occurrence of step differences on opposite sides of the protective sheet 34, which can cause the flexible screen 32 to fold or have a bad appearance.
  • the position of the neutral layer of the flexible display device 30 can be determined by adjusting the elastic modulus and / or the thickness of each layer of the flexible material of the flexible region 31 of the flexible display device 30.
  • the screen body layer 322 is positioned at the neutral layer position of the flexible display device 30.
  • the protective sheet 34 is also bent along with the flexible screen 32, and the screen body layer 322 is located at a neutral layer position of the flexible display device 30.
  • Ti is the corresponding layer thickness of the flexible display device
  • Ei is the elastic modulus of the corresponding layer of the flexible display device
  • Yi is the distance from the reference layer to the geometric center of the corresponding component layer
  • i is the corresponding number of layers.
  • the elastic modulus of the protective sheet 34 is greater than the elastic modulus of the flexible screen 32. Due to the elasticity of each layer of the flexible screen 32 (such as a light emitting layer, a base layer, a cathode layer, an anode layer, a TFT layer, etc.) The modulus is in a relatively low range. If common metal sheets such as steel plates, aluminum plates and other materials are used as protective layers to directly adhere and fix to the flexible screen, then the elastic modulus of common metal sheets is much larger than the films of each layer of the flexible screen. When it is bent together with the flexible screen, the elastic modulus of the flexible screen will easily cause damage to the flexible screen due to the large difference in the amount of stretching.
  • the present invention uses a liquid metal whose elastic modulus is more closely matched to the flexible screen as the protective sheet. Compared with common metal sheets, the elastic modulus is closer to the flexible screen and can provide sufficient rigidity to support the flexible screen. More ideal material.
  • the difference between the elastic modulus of the liquid metal protective sheet 34 and the flexible screen 32 (the elastic modulus of the flexible screen is the average elastic modulus of each film layer) is greater than or equal to 100 Gpa and less than or equal to 120 Gpa, and more preferably, less than or equal to 100 Gpa .
  • the thickness of the liquid metal protective sheet according to the embodiment of the present invention is between 5 micrometers ( ⁇ m) and 200 micrometers (inclusive).
  • the liquid metal protective sheet in this thickness range can provide sufficient support to the flexible screen 32 and has excellent bending performance, and can avoid the situation that the protective sheet 34 is too thick and affects the bending of the flexible screen. Further, the thickness of the liquid metal protective sheet can be controlled below 50um to obtain more ideal bending performance.
  • the protective sheet 34 may also be made of stainless steel sheet, soft wear-resistant plastic sheet, soft wear-resistant rubber sheet, or soft silicone sheet.
  • the electronic device 100 is a mobile phone. It can be understood that, in other embodiments, the electronic device 100 may be, but is not limited to, a PDA of a radio telephone, a pager, a web browser, a notepad, a calendar, and / or a global positioning system (GPS) receiver.
  • a PDA of a radio telephone
  • a pager a web browser
  • a notepad a calendar
  • / or a global positioning system (GPS) receiver GPS
  • the back of the flexible screen 32 of the electronic device 100 of the present application is provided with a protective sheet 34, that is, the back of the flexible screen 32 corresponds to the bendable area 31 and is in contact with the hinge 25 through the protective sheet 34. .
  • the protective sheet 34 and the hinge 25 slide relative to each other at the bendable area 31.
  • the protective sheet 34 has protection The function of the flexible screen 32, the back of the flexible screen 32 will not be worn during the bending or flattening of the electronic device 100, so it can ensure that the function of the flexible screen 32 is not affected; secondly, When the flexible screen 32 is bent along the bendable area 31, since the screen body layer 322 of the flexible screen 32 is located at the neutral layer position of the flexible display device 30, the screen body layer 322 is subject to Less stress, thereby improving the bending resistance of the screen body layer 322 and increasing the service life of the flexible screen 32; in addition, the hardness of the protective sheet 34 can fully support the flexible screen 32 and improve The rigidity of the flexible screen 32.
  • a guide groove 212 is provided at an end of the first frame body 21 remote from the second frame body 23.
  • a slide block 214 is slidably disposed in the guide slide groove 212.
  • An elastic member 216 is disposed between the bodies 21 along the sliding direction of the slider 214.
  • one end of the back surface of the protection sheet 34 is fixedly attached to the second frame body 23, and the other end of the back surface of the protection sheet 34 is fixedly attached to the first frame body 21.
  • the middle portion of the back surface of the protective sheet 34 is slidably connected with the hinge 25 to facilitate bending and flattening of the flexible display device 30.
  • One end of the back of the flexible screen 32 is fixedly attached to the slider 214, and the other end of the back of the flexible screen 32 is fixedly attached to the front of the protective sheet 34.
  • An area corresponding to the bendable area 31 between the back surface of the flexible screen 32 and the front surface of the protective sheet 34 is fixedly attached.
  • the elastic member 216 elastically pushes the slider 214 to slide toward an end away from the second frame body 23 to straighten the flexible screen 32 to prevent the electronic device 100 from being bent / flattened.
  • a region of the flexible display device 30 corresponding to the bendable region 31 is separated from the hinge 25 and arched.
  • the elastic member 216 is a spring, one end of the spring is connected to the first frame 21, and the other end of the spring is connected to the slider 214.
  • the flexible screen 32 further includes a supporting film 324 laminated on the back surface of the screen body layer 322 and a cover layer 326 laminated on the front surface of the screen body layer 322.
  • the supporting film 324 is fixedly attached to the back surface of the screen body layer 322 by colloids such as optical glue, UV glue, and adhesive; the protective sheet 34 is fixedly attached to the place by colloids such as optical glue, UV glue, and adhesive.
  • the back surface of the support film 324 is described.
  • the supporting film 324 may be a PET film, a PI film, a PC film, or the like.
  • Optical glue is also laminated between the support film 324 and the slider 214 to make the connection between the back of the flexible screen 32 and the slider 214 more firm.
  • Optical adhesive is laminated between the back surface of the protective sheet 34 and the first frame body 21 and the second frame body 23, so that the flexible screen 32 and the first frame body 21 and the second frame body are laminated. The 23 connection is stronger.
  • the front surface of the protection sheet 34 and the back surface of the support film 324 slide relative to the bendable area 31, and the back surface of the protection sheet 34 is fixed by means of gluing, welding, or snapping.
  • the second frame body 23 and the hinge 25 On the first frame body 21, the second frame body 23 and the hinge 25.
  • the protected sheet 34 and the supporting film 324 slide relative to each other in the area of the bendable area 31, and the screen body layer 322 is located at The position of the neutral layer of the flexible display device 30 can effectively prevent the hinge 25 from abrasion to the flexible screen 32 and improve the bending resistance of the flexible screen 32.
  • the cover layer 326 is a light-transmissive and bending-resistant sheet.
  • the cover layer 326 is an ultra-thin glass cover sheet, and the thickness of the ultra-thin glass cover sheet is micron.
  • the ultra-thin glass cover sheet has advantages such as better bending resistance, high strength, and high hardness.
  • the ultra-thin glass cover sheet When the ultra-thin glass cover sheet is attached to the screen, When the front surface of the body layer 322, the ultra-thin glass cover sheet can not only be bent or flattened with the flexible screen 32, but also can effectively resist external objects from scratching the ultra-thin glass cover sheet, and it is not prone to wear.
  • the ultra-thin glass cover sheet has a low modulus of elasticity, and can be directly stuck on the front surface of the flexible screen 32.
  • the flexible display device 30 When the flexible display device 30 is bent, the flexible display device 30 can be synchronized or stretched along with the flexible screen 32 to avoid flexible display. When the device 30 is bent, it may be damaged due to a large difference in the stretching amplitude.
  • the ultra-thin glass cover sheet has a high light transmittance, which facilitates the emission of light from the flexible screen 32, and after long-term use, the ultra-thin glass cover sheet does not suffer from aging problems such as discoloration.
  • the thickness of the cover layer 326 is between 5 ⁇ m and 80 ⁇ m (inclusive), the elastic modulus of the cover layer 326 is between 50 GPa and 100 GPa (inclusive), and the yield strength is greater than 1Gpa.
  • the cover layer 326 may also be a flexible transparent cover.
  • the thickness and elastic modulus of the cover layer 326 are set to t1 and E1, respectively, the thickness and elastic modulus of the protective sheet 34 are t2 and E2, respectively.
  • the elastic modulus of the cover layer 326 and the protection sheet 34 are equivalent, that is, E1 ⁇ E2
  • the thickness of the cover layer 326 and the protection sheet 34 should be set to satisfy 2t1 ⁇ t2;
  • the elastic modulus of the cover layer 326 and the protection sheet 34 should be set to satisfy 2.5E1 ⁇ E2.
  • E1 ⁇ E2 means that ⁇ E1-E2 ⁇ / (the smaller of E1 and E2) is less than Or equal to 20%
  • other expressions can also refer to the above expressions.
  • the front surface of the protective sheet 34 and the back surface of the flexible screen 32 are bonded by a gel layer.
  • the storage modulus value of the gel layer is greater than or equal to 50 KPa, and the glass transition of the gel 36 The temperature is less than or equal to -20 ° C.
  • a light-shielding black adhesive layer may be further provided on the back surface of the screen body layer 322, and the support film 324 is fixedly attached to the back of the light-shielding black adhesive layer of the screen body layer 322 to prevent or reduce The light-shielding black adhesive layer of the flexible screen 32 is worn.
  • FIG. 3 is a schematic cross-sectional structural diagram of an electronic device in a second embodiment of the present application
  • FIG. 4 is an enlarged view of a IV portion in FIG. 3.
  • the structure of the second embodiment of the electronic device of the present application is similar to that of the first embodiment, except that the flexible display device 30 further includes a support sheet 36 laminated on the back of the protection sheet 34.
  • the thickness of the support sheet 36 is greater than or equal to the thickness of the protection sheet 34 to provide more sufficient support strength.
  • the strength of the support sheet 36 is greater than the strength of the protection sheet 34.
  • the support sheet 36 is made of a bending-resistant material, and a front surface of the support sheet 36 and a back surface of the protection sheet 34 corresponding to the bendable area 31 slide relative to each other, that is, the front surface of the support sheet 36
  • the bendable area 31 corresponding to the back surface of the protective sheet 34 is not fixed.
  • the elastic modulus of the protection sheet 34 is smaller than the elastic modulus of the support sheet 36. Further, the difference between the elastic modulus of the protective sheet 34 and the elastic modulus of the flexible screen 32 is smaller than the difference between the elastic modulus of the support sheet 36 and the elastic modulus of the protective sheet 34.
  • the protection sheet 34 is a liquid metal.
  • the protective sheet 34 of the embodiment of the present invention is a liquid metal protective sheet made of liquid metal, and the thickness of the liquid metal protective sheet is between 5 micrometers ( ⁇ m) and 200 micrometers (inclusive).
  • the liquid metal protective sheet in this thickness range can provide sufficient support for the flexible screen 32 and has excellent bending performance, and can avoid the situation that the protective sheet 34 is too thick and affects the bending of the flexible screen.
  • the thickness of the liquid metal protective sheet is between 5 micrometers and 50 micrometers (inclusive) to obtain more ideal bending performance.
  • the supporting sheet 36 may be a liquid metal sheet, a soft wear-resistant plastic sheet, a soft wear-resistant rubber sheet, or a soft silicone sheet.
  • the supporting sheet 36 may also be made of a material such as a tetrafluoroethylene layer, graphite, molybdenum disulfide, or a thermoplastic polyurethane elastomer rubber.
  • the supporting sheet 36 is a liquid metal sheet.
  • the thickness of the supporting sheet 36 is between 50 microns and 300 microns (inclusive).
  • the supporting sheet 36 may also be a bendable steel sheet.
  • the steel sheet is a stainless steel sheet.
  • the back surface of the support piece 36 covers the first frame body 21, the second frame body 23, and the hinge 25.
  • the support piece 36 is bent or flattened as the hinge 25 is bent or flattened. shop.
  • the back surface of the support sheet 36 is fixedly attached to the front surface of the hinge 25 and the front surfaces of the first frame body and the second frame body by means of adhesive, welding, screwing, buckling, magnetic attraction, or the like.
  • a receiving groove 362 is defined on the front side of the supporting piece 36 corresponding to the bendable area 31, and the protective piece 34 is slidably received in the receiving groove 362.
  • the protective sheet 34 is housed in the receiving groove 362, and the front surface of the protective sheet 34 is fixedly attached to the back surface of the support film 324 by colloids such as optical glue, UV glue, and adhesive. At this time, the The side of the supporting sheet 36 facing the flexible screen 32 is flush with the side of the protective sheet 34 facing the flexible screen 32.
  • a length of the receiving groove 362 extending in a direction perpendicular to the bending axis of the flexible screen 32 is greater than a length of the protective sheet 34 extending in a direction perpendicular to the bending axis of the flexible screen 32, that is, The length of the receiving groove 362 along the longitudinal direction of the flexible screen 32 is greater than the length of the protective sheet 34 along the longitudinal direction of the flexible screen 32.
  • the thickness of the receiving groove 362 is greater than or equal to the thickness of the protective sheet 34.
  • the receiving groove 362 on the supporting sheet 36 is processed by laser or laser etching.
  • the bending axis referred to in the present invention is not limited to a solid axis, but may also be a non-solid axis, as long as the flexible screen can be bent around the axis, it can be regarded as a bending axis.
  • the receiving groove 362 covers the bendable area 31, that is, the area of the opening of the receiving groove 362 is greater than or equal to the area area of the bendable area 31.
  • the back surface of the protective sheet 34 is slidably attached to the inner surface of the receiving slot 362 facing the flexible screen 32.
  • the back surface of the protection sheet 34 is the side of the protection sheet 34 facing away from the flexible screen 32, and the inner surface of the storage groove 362 facing the protection sheet 34 is the bottom surface of the storage groove 364.
  • the receiving groove 362 can pass through the back surface of the support sheet 36, and the back surface of the protection sheet 34 is flush with the back surface of the support sheet 36, that is, the protection sheet 34 faces away from the back
  • the side of the flexible screen 32 is flush with the side of the support sheet 36 facing away from the flexible screen 32.
  • a slip-promoting substance is disposed between the back surface of the protective sheet 34 and the bottom of the receiving groove 362.
  • the slip aid may be Teflon.
  • the surfaces of the protection sheet and the support sheet facing each other may also be coated with the above-mentioned slip-assist substance to reduce the friction between the two.
  • the opening area of the receiving groove 362 may be smaller than the area of the bendable area 31.
  • FIG. 5 is a partial cross-sectional structural diagram of an electronic device in a third embodiment of the present application
  • FIG. 6 is an enlarged view of a VI portion in FIG. 5.
  • the structure of the third embodiment of the electronic device of the present application is similar to that of the second embodiment, except that in the third embodiment, the back surface of the protective sheet 34 and the inner surface of the receiving groove 362 (ie, the groove) Bottom) There is a gap 364.
  • the protective sheet 34 moves in the receiving groove 362, but between the back surface of the protective sheet 34 and the bottom surface of the receiving groove 364
  • the gap 364 is provided without frictional contact, so that the flexible screen 32 can be better prevented from being worn.
  • the receiving groove 362 includes a groove bottom surface 3621 facing the back surface of the protection sheet 34, and two opposite inner side surfaces 3623, each inner side surface 3623 being parallel to the flexible screen 32. Bending axis.
  • the two inner side surfaces 3623 and the groove bottom surface 3621 collectively surround the receiving groove 362.
  • the gap 364 is defined between the groove bottom surface 3621 and the back surface of the protection sheet 34, and the two inner surface 3623 and the outer surface corresponding to the protection sheet 34.
  • the thickness a of the supporting sheet 36 is between 50 ⁇ m and 300 ⁇ m (inclusive).
  • the width b of the gap between the back surface of the protection sheet 34 and the groove bottom surface 3621 is 10 ⁇ m to 300 ⁇ m (inclusive).
  • a gap c between each inner side surface 3623 and a corresponding outer side surface of the protective sheet 34 is greater than 0 ⁇ m.
  • FIG. 7 is a schematic cross-sectional structure diagram of an electronic device in a fourth embodiment of the present application
  • FIG. 8 is an enlarged view of a portion VIII in FIG. 7.
  • the structure of the fourth embodiment of the electronic device of the present application is similar to that of the third embodiment, except that in the fourth embodiment, an intersection is provided at the intersection of each inner side surface 3623 and the groove bottom surface 3621.
  • Angle 3625, the chamfer 3625 can disperse the stress generated by the supporting sheet 36 during bending, and avoid excessive stress at the position where the supporting sheet 36 meets the groove bottom surface 3621 on the inner side 3623, so as to extend the The service life of the flexible screen 32 is described.
  • FIG. 9 is a schematic cross-sectional structure diagram of an electronic device in a fifth embodiment of the present application
  • FIG. 10 is an enlarged view of a portion X in FIG. 9.
  • the structure of the fifth embodiment of the electronic device of the present application is similar to that of the third embodiment, except that in the fifth embodiment, a circle is provided at the intersection of each inner side surface 3623 and the groove bottom surface 3621.
  • Angle 3626 the stress concentration generated by the flexible screen 32 during the bending process decreases as the radius of the rounded corner 3626 increases, so that the stress distribution tends to be uniform, thereby improving the flexible display device A fatigue safety factor of 30 to extend the service life of the flexible screen 32.
  • each rounded corner 3626 is tangent to the groove bottom surface 3621 of the support piece 36 or the inner side surface 3623 of the receiving groove 362, so that the inner side surface 3623 and the groove bottom surface 3621 are tangent to each other.
  • the radius of the fillet 3626 at the intersection is larger.
  • FIG. 11 is a schematic cross-sectional structure diagram of an electronic device in a sixth embodiment of the present application.
  • the structure of the sixth embodiment of the electronic device of the present application is similar to that of the third embodiment, except that in the sixth embodiment, the back surface of the protective sheet 34 and the support sheet 36 correspond to each other.
  • a lubricating material coating 39 is provided in the bendable area, that is, lubrication is provided between a back surface of the protection sheet 34 and a groove bottom surface of the receiving groove 362 of the support sheet 36 facing the back surface of the protection sheet 34. Material coating 39.
  • the lubricating material coating layer 39 may be applied to the back surface of the protective sheet 34, or may be applied to a groove bottom surface of the receiving groove 362 facing the rear surface of the protective sheet 34.
  • the lubricating material coating 39 is provided between the groove bottom surfaces of the grooves 362, so that the friction coefficient between the protective sheet 34 and the support sheet 36 can be reduced, and the life of the flexible screen 32 can be extended.
  • the lubricant material coating 39 is Teflon.
  • the lubricating material layer may also be graphite, molybdenum disulfide, or thermoplastic polyurethane elastomer rubber.
  • FIG. 12 is a schematic cross-sectional structure diagram of an electronic device in a seventh embodiment of the present application.
  • the structure of the seventh embodiment of the electronic device of the present application is similar to that of the fifth embodiment, except that in the seventh embodiment, the back surface of the protective sheet 34 and the support sheet 36 correspond to each other.
  • a lubricating material coating 39 is provided in the bendable area, that is, lubrication is provided between a back surface of the protection sheet 34 and a groove bottom surface of the receiving groove 362 of the support sheet 36 facing the back surface of the protection sheet 34. Material coating 39.
  • the lubricating material coating layer 39 may be applied to the back surface of the protective sheet 34, or may be applied to a groove bottom surface of the receiving groove 362 facing the rear surface of the protective sheet 34.
  • the lubricating material coating 39 is provided between the groove bottom surfaces of the grooves 362, so that the friction coefficient between the protective sheet 34 and the support sheet 36 can be reduced, and the life of the flexible screen 32 can be extended.
  • a coating of a lubricating material may be provided between two surfaces of the protective sheet and the supporting sheet facing each other, and the coating of the lubricating material may be applied to any one of the protective sheet or the supporting sheet to reduce Small friction between the two.
  • FIG. 13 is a schematic diagram of a front structure of an electronic device in an eighth embodiment of the present application.
  • the structure of the eighth embodiment of the electronic device of the present application is similar to that of the third embodiment, except that in the eighth embodiment, the front surface of the support piece 36 is provided with a prism shape corresponding to the bendable area 31.
  • the storage slot 362 and the protection sheet 34 are prismatic liquid metal pieces stored in the prismatic storage slot 362.
  • One of the symmetrical axes of the prismatic receiving groove 362 is parallel to the bending axis of the flexible screen 32, and the other symmetrical axis of the prismatic receiving groove 362 is perpendicular to the bending axis of the flexible screen 32.
  • the protection sheet 34 is designed in a prism shape to enhance the bending resistance of the flexible screen 32.
  • FIG. 14 is a schematic diagram of a front structure of an electronic device in a ninth embodiment of the present application.
  • the structure of the ninth embodiment of the electronic device of the present application is similar to that of the eighth embodiment, except that in the ninth embodiment, the front surface of the support piece 36 is provided with an oval shape corresponding to the bendable area 31.
  • the storage slot 362 and the protection sheet 34 are oval liquid metal pieces stored in the prismatic storage slot 362.
  • FIG. 15 is a schematic diagram of a front structure of an electronic device in a tenth embodiment of the present application.
  • the structure of the tenth embodiment of the electronic device of the present application is similar to that of the third embodiment, except that in the tenth embodiment, the front surface of the support piece 36 is provided at a distance from the bendable area 31.
  • Each of the plurality of receiving slots 362 is rectangular. Each receiving slot 362 extends in a direction perpendicular to the bending axis of the flexible screen 32.
  • a rectangular protective sheet 34 is disposed in each receiving slot 362. A plurality of rectangular protective sheets 34 can disperse the stress when the flexible screen 32 is bent, thereby enhancing the bending resistance of the flexible screen 32.
  • the protection sheet 34 may also be arranged in a pattern, that is, a pattern in which the protection sheet 34 is arranged in an array or a queue is arranged.
  • the protection sheet 34 may include diamond-shaped sheets distributed in an array, and a gap is formed between the diamond-shaped sheets and connected by a strip-shaped sheet.
  • the protection sheet 34 may include strip-shaped sheets arranged in a queue, and the strip-shaped sheets are separated by a gap, and the extending direction of each strip-shaped sheet is perpendicular to the bending axis of the flexible screen 32. By patterning, the bending resistance of the protective sheet 34 is increased.
  • the flexible screen 32 of the present invention may not include or only include any one or more or all of the cover layer 326 and the support film 324.
  • the term “bend-resistant material” as used in the present invention refers to a material that does not break when it is bent at least 5000 times or more.
  • the “relative sliding” in the present invention does not limit direct contact and relative sliding between two components, but may also include relative sliding between third-party components, and third-party components are not limited to solid components, such as Sheets, films, etc., may also include non-solid components, such as gaps, spaces, etc., or a combination of solid and non-solid components; third-party components are not limited to one, but may include multiple. That is, as long as the two elements have a relative sliding motion relationship, regardless of the actual position of the two elements, they can be considered to be within the range of “relative sliding” as referred to in the present invention.

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Abstract

一种电子装置(100)包括壳体(20)及柔性显示装置(30)，壳体(20)包括第一框体(21)、第二框体(23)及铰链(25)，柔性显示装置(30)设置于第一框体(21)、第二框体(23)及铰链(25)上，柔性显示装置(30)包括柔性屏(32)，柔性屏(32)的背面层叠有由耐弯折材料制成的保护片(34)，柔性屏(32)设置有可折弯区域(31)，保护片(34)覆盖可折弯区域(31)，柔性屏(32)包括屏体层(322)，保护片(34)用于支撑屏体层(322)。柔性屏(32)的背面不会被磨损，且提高了柔性屏(32)的耐弯折性。

Description

电子装置及其柔性显示装置 技术领域
本申请涉及电子设备的显示装置领域，尤其涉及一种柔性显示装置，以及设置有所述柔性显示装置的电子装置。
背景技术
随着柔性屏的发展，现有技术中已经出现了折叠式显示屏的电子装置，现有的折叠式显示屏的电子装置一般通过铰链来实现柔性屏的弯折。然而，现有的电子装置在折弯或展平的过程中，所述柔性屏与所述铰链之间会相对滑动而摩擦，因此，容易造成所述柔性屏损坏，影响所述柔性屏的功能。
发明内容
本申请提供一种能防止柔性屏损坏的柔性显示装置，以及设置有所述柔性显示装置的电子装置。
本申请提供的一种柔性显示装置，包括柔性屏，所述柔性屏的背面层叠有由耐弯折材料制成的保护片，所述柔性屏设置有可折弯区域，所述保护片覆盖所述可折弯区域，所述柔性屏包括屏体层，所述保护片用于支撑所述屏体层。
本申请还提供一种电子装置包括壳体及柔性显示装置，所述壳体包括第一框体、第二框体及连接于所述第一框体与所述第二框体之间的铰链，所述柔性显示装置设置于所述第一框体、第二框体及所述铰链上，所述柔性显示装置包括柔性屏，所述柔性屏的背面层叠有由耐弯折材料制成的保护片，所述柔性屏设置有可折弯区域，所述保护片覆盖所述可折弯区域，所述柔性屏包括屏体层，所述保护片用于支撑所述屏体层。
本申请申请电子装置的柔性屏的背面设置有保护片，所述柔性屏的屏体层位于所述柔性显示装置的中性层位置。因此，当所述电子装置通过所述铰链折弯或展平时，所述保护片具有保护所述柔性屏的作用，并且所述屏体层受到的应力较少，提高了所述屏体层的耐弯折性，增长了所述柔性屏的使用寿命。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例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发明的一些实施例，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是本申请第一实施例中的电子装置的立体结构示意图。
图2是图1中沿II-II线的剖视图。
图3是本申请第二实施例中的电子装置的部分剖视结构示意图。
图4是图3中IV部分的放大图。
图5是本申请第三实施例中的电子装置的部分剖视结构示意图。
图6是图5中VI部分的放大图。
图7是本申请第四实施例中的电子装置的部分剖视结构示意图。
图8是图7中VIII部分的放大图。
图9是本申请第五实施例中的电子装置的部分剖视结构示意图。
图10是图9中X部分的放大图。
图11是本申请第六实施例中的电子装置的部分剖视结构示意图。
图12是本申请第七实施例中的电子装置的部分剖视结构示意图。
图13是本申请第八实施例中的电子装置的正面结构示意图。
图14是本申请第九实施例中的电子装置的正面结构示意图。
图15是本申请第十实施例中的电子装置的正面结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明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发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，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，都属于本发明保护的范围。
本发明实施例的描述中，需要理解的是，术语“上”、“下”“左”“右”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是暗示或指示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
本发明实施例的描述中，需要理解的是，术语“厚度”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是暗示或指示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
请一并参阅图1及图2，图1是本申请第一实施例中的电子装置的立体结构示意图；图2是图1中沿II-II线的剖视图。本申请的第一实施例中的电子装置100包括一壳体20及设置于所述壳体20上的一柔性显示装置30。所述壳体20包括一第一框体21、一第二框体23及连接于所述第一框体21与所述第二框体23之间的一铰链25。所述柔性显示装置30设置于所述第一框体21、第二框体23及所述铰链25上。所述柔性显示装置30设置有对应所述铰链25的一可折弯区域31及连接于所述可折弯区域31的非折弯区域。所述柔性显示装置30包括一柔性屏32及设置于所述柔性屏32背面的一保护片34。所述保护片34覆盖所述可折弯区域31。所述柔性屏32包括一屏体层322，所述保护片34设置于所述屏体层322的背面，所述保护片34用于支撑和保护所述柔性屏32，以提高所述柔性屏32的刚性及防止所述柔性屏32的背面磨损。所述屏体层322即为显示图像的主体。
本实施例中，所述保护片34可以是硅胶、泡棉、薄金属片如铜箔、液态金属片、记忆合金或其他符合材料。更优选的采用液态金属片，所述液态金属片可以为铜、钛、铁、锆、银、镍、镓、金、锑、镉、锌、铟、硅等中一种或多种材料的合金材料，具体金属优选可获得更低的弹性模量、硬度、延伸性等其他力学性质。所述保护片34的正面通过胶体固定贴接于所述柔性屏32的背面，所述保护片34的背面与所述铰链25之间能相对滑动。当所述电子装置100通过所述铰链25弯曲时，所述柔性显示装置30沿所述可折弯区域31弯曲，所述保护片34相对于所述铰链25滑动。在所述柔性显示装置30的弯曲过程中，所述屏体层322位于所述柔性显示装置30的中性层位置，以提高所述屏体层322的耐弯折性。所述柔性屏32的正面指所述柔性屏32的出光面，所述柔性屏32的背面指背朝所述出光面的面。
所述中性层是指柔性显示装置30在弯曲的过程中，所述柔性显示装置30的外层受拉伸，柔性显示装置30的内层受挤压，在其断面上有一个不受拉伸，又不受挤压的过渡层，所述过渡层的应力很少，所述过渡层即为中性层。本申 请中的屏体层322位于所述中性层上，以提高所述屏体层322的耐弯折性。
本申请所称液态金属是指将合金加热到熔融态，然后以超快的冷却速度冷却，使合金晶格来不及有序排列结晶便固化，因为是非结晶状态，像玻璃，所以又被称为非晶合金、液态金属或金属玻璃。液态金属的特性是长程无序(短程有序)、亚稳态、一定程度上的物理特性各向同性、没有确切熔点、具有玻璃转化温度点等，具有固态、金属、玻璃的特性，可以在一定条件下具有高强度、高硬度、塑性、热传导和耐磨性等。也就是说，本发明所称的液态金属在常温实质上是固态的，只不过其某些特性接近液体，所以称之为液态金属。
本实施例中选用液态金属片作为保护片34的原因在于液态金属片的耐磨性较佳，当其通过光学胶、UV胶、背胶等胶体贴设于柔性屏32的背面时，所述液态金属片不仅可以支撑所述柔性屏32，并且可以有效地抵御铰链25对其产生的摩擦，不易出现磨损的情况。另一方面，液态金属片的弹性模量较低，可将其直接粘贴在柔性屏32的背面，在柔性显示装置30弯曲时可跟随柔性屏32一起同步或近似同步拉伸，从而避免柔性显示装置30在弯曲时由于拉伸幅度差异较大导致出现破损的情况。并且，相比于现有的弹性模量更低的材料，如硅胶、泡棉、塑胶、薄金属片、记忆合金等，液态金属的强度更高，且耐磨性更佳，可有效地对柔性屏进行支撑。
所述保护片34可全贴合于柔性屏32的整个背面，也可以仅贴合于柔性屏背面的可折弯区域31，即只有在柔性屏32背面的可折弯区域31贴有保护片34，非弯曲区域无保护片34分布，以节省所述柔性显示装置30的制造成本。
所述保护片34覆盖所述柔性屏32的背面的非折弯区域，这种全覆盖的方式可以避免在保护片34的相对两侧出现段差，导致柔性屏32出现褶皱或外观不良的情况。
所述柔性显示装置30的中性层的位置可以通过调节柔性显示装置30的可折弯区域31的各层膜材的弹性模量和/或厚度来确定。本实施例中，通过调节所述保护片34对应所述可折弯区域31的区域的厚度和/或弹性模量，使所述屏体层322位于所述柔性显示装置30的中性层位置。在所述柔性屏32弯曲时，所述保护片34也随所述柔性屏32弯曲，所述屏体层322位于所述柔性显示装置30的中性层位置。可以选用所述保护片34作为参考层，所述参考层到所述中性层的距离应满足Yn＝(∑(Ti*Ei*Yi))/(∑(Ti*Ei))，Yn为参考层到中性层的距 离，Ti为柔性显示装置的相应层厚度，Ei为柔性显示装置的相应层弹性模量，Yi为参考层到相应组件层几何中心的距离，i为相应层数。
优选地，所述保护片34的弹性模量大于柔性屏32的弹性模量，由于柔性屏32的各层膜材(如发光层、基底层、阴极层、阳极层、TFT层等)的弹性模量均在较低的范围，如果采用常用的金属片，如钢板、铝板等材料作为保护层直接与柔性屏贴合固定，那么由于常见金属片的弹性模量远大于柔性屏各层膜材的弹性模量，在与柔性屏一同弯折时将容易由于出现拉伸量差异过大而导致柔性屏损坏的情况。因此，本发明采用弹性模量与柔性屏匹配更加接近的液态金属作为保护片，其相比于常见的金属片，弹性模量更接近于柔性屏，且能提供充分的硬度支撑柔性屏，是较为理想的材料。液态金属保护片34与柔性屏32的弹性模量之差(柔性屏的弹性模量为各膜层的平均弹性模量)大于或等于100Gpa并小于或等于120Gpa，更优选地，小于或等于100Gpa。
更优选地，本发明实施例的液态金属保护片的厚度介于5微米(μm)与200微米之间(含本数)。此厚度范围的液体金属保护片能给柔性屏32提供充分的支撑力，且弯折性能优良，可避免保护片34过厚而影响柔性屏弯折的情况。进一步地，液态金属保护片的厚度可控制在50um之下以获得更加理想的弯折性能。
在其他实施例中，所述保护片34还可以是由不锈钢片、软质耐磨塑胶片、软质耐磨橡胶片或软质硅胶片等。
本实施例中，所述电子装置100为手机。可以理解，在其它实施例中，电子装置100可以是但不限于无线电电话、寻呼机、Web浏览器、记事簿、日历以及/或全球定位系统(GPS)接收器的PDA。
本申请电子装置100的柔性屏32的背面设置有保护片34，即，所述柔性屏32的背面对应所述可折弯区域31处与所述铰链25之间是通过所述保护片34接触。当所述电子装置100通过所述铰链25折弯或展平时，所述保护片34与所述铰链25之间于所述可折弯区域31处相对滑动，因此，所述保护片34具有保护所述柔性屏32的作用，所述柔性屏32的背面在所述电子装置100折弯或展平的过程中不会被磨损，故此可确保所述柔性屏32的功能不受影响；其次，所述柔性屏32在沿所述可折弯区域31弯曲时，由于所述柔性屏32的屏体层322位于所述柔性显示装置30的中性层位置，因此，所述屏体层322 受到的应力较少，从而提高了所述屏体层322的耐弯折性，增长了所述柔性屏32的使用寿命；另外，所述保护片34的硬度能充分支撑所述柔性屏32，提高所述柔性屏32的刚性。
所述第一框体21远离所述第二框体23的一端开设有一导滑槽212，所述导滑槽212内滑动地设置有一滑块214，所述滑块214与所述第一框体21之间沿所述滑块214的滑动方向设置有一弹性件216。本实施例中，所述保护片34的背面的一端固定贴合于所述第二框体23上，所述保护片34的背面的另一端固定贴合于所述第一框体21上，所述保护片34的背面的中部与所述铰链25之间滑动连接，以便于所述柔性显示装置30折弯与展平。所述柔性屏32的背面的一端固定贴合于所述滑块214上，所述柔性屏32的背面的另一端固定贴合于所述保护片34的正面上。所述柔性屏32的背面与所述保护片34的正面之间对应所述可折弯区域31的区域固定贴合。所述弹性件216弹性抵推所述滑块214朝远离所述第二框体23的一端滑动，以向外拉直所述柔性屏32，避免所述电子装置100在折弯/展平时，所述柔性显示装置30对应所述可折弯区域31的区域与所述铰链25分离而拱起。
本实施例中，所述弹性件216是弹簧，所述弹簧的一端连接于所述第一框体21，所述弹簧的另一端连接于所述滑块214。
本实施例中，所述柔性屏32还包括层叠于所述屏体层322的背面的一支撑膜324，以及层叠于所述屏体层322的正面的一盖板层326。所述支撑膜324通过光学胶、UV胶、背胶等胶体固定贴合于所述屏体层322的背面；所述保护片34通过光学胶、UV胶、背胶等胶体固定贴合于所述支撑膜324的背面。通过调节盖板层326、保护片34及支撑膜324的厚度和/或弹性模量，能使所述屏体层322位于所述柔性显示装置30的中性层位置。所述支撑膜324可以是PET膜、PI膜或PC膜等。
所述支撑膜324与所述滑块214之间也层叠有光学胶，以使所述柔性屏32的背面与所述滑块214的连接更牢固。所述保护片34的背面与所述第一框体21及所述第二框体23之间层叠有光学胶，从而使所述柔性屏32与所述第一框体21及第二框体23的连接更牢固。
在其他实施例中，所述保护片34的正面与所述支撑膜324的背面对应所述可弯折区域31相对滑动，所述保护片34的背面通过胶接、焊接或卡接等方 式固定于所述第一框体21、所述第二框体23及所述铰链25上。当所述电子装置100通过所述铰链25折弯或展平时，所保护片34与所述支撑膜324之间在所述可折弯区域31的区域内相对滑动，所述屏体层322位于所述柔性显示装置30的中性层位置，从而能有效地防止所述铰链25磨损到所述柔性屏32，并且提高了所述柔性屏32的耐弯折性。
所述盖板层326是透光的、且耐弯折的薄片，本实施例中，所述盖板层326为超薄玻璃盖片，所述超薄玻璃盖片的厚度为微米级。
本实施例中选用超薄玻璃盖片作为盖板层326的原因在于超薄玻璃盖片具有较好的耐弯折性、高强度、高硬度等优点，当超薄玻璃盖片贴设于屏体层322的正面时，所述超薄玻璃盖片不仅可以随所述柔性屏32弯曲或展平，并且可以有效地抵御外部物件对超薄玻璃盖片划伤，不易出现磨损的情况。其次，超薄玻璃盖片的弹性模量较低，可将其直接粘贴在柔性屏32的正面，在柔性显示装置30弯曲时可跟随柔性屏32一起同步或近似同步拉伸，从而避免柔性显示装置30在弯曲时由于拉伸幅度差异较大导致出现破损的情况。另一方面，所述超薄玻璃盖片的透光率高，方便所述柔性屏32的光线的射出，且长时间使用后，所述超薄玻璃盖片也不会出现变色等老化问题。
优选地，所述盖板层326的厚度范围为5微米～80微米之间(含本数)，所述盖板层326的弹性模量范围为50GPa～100GPa之间(含本数)，屈服强度大于1Gpa。
在其他实施例中，所述盖板层326也可以是柔性的透明盖板。
本申请中，若设定所述盖板层326的厚度及弹性模量分别为t1及E1，所述保护片34的厚度及弹性模量分别为t2及E2。当所述盖板层326与所述保护片34的弹性模量相当时，即E1≈E2，应设置所述盖板层326及所述保护片34的厚度满足2t1≈t2；当所述盖板层326与所述保护片34的厚度相当时，即t1≈t2，应设置所述盖板层326及所述保护片34的弹性模量满足2.5E1≈E2。本发明所称“相当”及“约等于(≈)”表示前后数值的差值比例小于或等于20％，即E1≈E2表示∣E1-E2∣/(E1与E2中数值更小者)小于或等于20％，其他表达式也可参考上述表述。
本实施例中，所述保护片34的正面与所述柔性屏32的背面之间通过胶体层贴合，所述胶体层的储存模量值大于或等于50KPa，所述胶体36的玻璃化 转变温度小于或等于-20℃。
在其他实施例中，所述屏体层322背面还可设置遮光黑胶层，所述支撑膜324固定贴合在屏体层322的遮光黑胶层的背面上，以起到防止或减小柔性屏32的遮光黑胶层被磨损。
请参阅图3及图4所示，图3是本申请第二实施例中的电子装置的部分剖视结构示意图，图4是图3中IV部分的放大图。本申请的电子装置的第二实施例的结构与第一实施例的结构相似，不同之处在于：所述柔性显示装置30还包括层叠于所述保护片34背面的一支撑片36，所述支撑片36的厚度大于或等于所述保护片34的厚度，以提供更充分的支撑力度。所述支撑片36的强度大于所述保护片34的强度。所述支撑片36由耐弯折材料制成，所述支撑片36的正面与所述保护片34的背面对应所述可折弯区域31的区域相对滑动，即，所述支撑片36的正面与所述保护片34的背面对应所述可折弯区域31不固定。
本实施例中，所述保护片34的弹性模量小于所述支撑片36的弹性模量。进一步地，所述保护片34的弹性模量与柔性屏32的弹性模量的差值小于支撑片36的弹性模量与保护片34的弹性模量的差值。所述保护片34为液态金属。
更优选地，本发明实施例的保护片34是由液态金属制成的液态金属保护片，所述液态金属保护片的厚度介于5微米(μm)与200微米之间(含本数)。此厚度范围的液态金属保护片能给柔性屏32提供充分的支撑力，且弯折性能优良，可避免保护片34过厚而影响柔性屏弯折的情况。进一步地，液态金属保护片的厚度介于5微米与50微米之间(含本数)，以获得更加理想的弯折性能。
所述支撑片36可以是液态金属片、软质耐磨塑胶片、软质耐磨橡胶片或软质硅胶片等。所述支撑片36也可以由如四氟乙烯层、石墨、二硫化钼或热塑性聚氨酯弹性体橡胶等材料制成。本实施例中，所述支撑片36是液态金属片，具体的，所述支撑片36的厚度介于50微米与300微米之间(含本数)。
在其他实施例中，所述支撑片36也可以是能弯曲的钢片，具体的，所述钢片为不锈钢薄片。
本实施例中，所述支撑片36的背面覆盖所述第一框体21、第二框体23及铰链25，所述支撑片36随所述铰链25的折弯或展平而弯曲或平铺。具体的，所述支撑片36的背面通过粘胶、焊接、螺锁、卡扣、磁吸等方式固定贴 接于所述铰链25的正面以及第一框体和第二框体的正面。所述支撑片36的正面对应所述可折弯区域31开设有一收容槽362，所述保护片34能滑动的收容于所述收容槽362内。所述保护片34收容于所述收容槽362内，且所述保护片34的正面通过光学胶、UV胶、背胶等胶体固定贴合于所述支撑膜324的背面，此时，所述支撑片36面朝所述柔性屏32的侧面与所述保护片34面朝所述柔性屏32的侧面齐平。
请参阅图4，所述收容槽362沿垂直于所述柔性屏32的弯曲轴的方向延伸的长度大于所述保护片34沿垂直于所述柔性屏32的弯曲轴的方向延伸的长度，即，所述收容槽362沿所述柔性屏32的外侧的长度方向的长度大于所述保护片34沿所述柔性屏32的外侧的长度方向的长度。所述收容槽362的厚度大于或等于所述保护片34的厚度。所述支撑片36上的收容槽362采用激光镭射或蚀刻加工而成。本发明所称弯曲轴并非限定是实体的轴，也可以是非实体的轴，只要柔性屏能够绕该轴弯曲均可以认为是弯曲轴。
本实施例中，所述收容槽362覆盖所述可折弯区域31，即，所述收容槽362的开孔面积大于或等于所述可折弯区域31的区域面积。所述保护片34的背面滑动贴接于所述收容槽362的面朝所述柔性屏32的内表面。所述保护片34的背面是所述保护片34背朝所述柔性屏32的侧面，所述收容槽362朝向所述保护片34的内表面为所述收容槽364的槽底面。当所述电子装置100通过所述铰链25折弯或展平时，所述保护片34的背面与所述收容槽364的槽底面之间相对滑动，从而能防止所述铰链25磨损所述柔性屏32。
在其他实施例中，所述收容槽362可穿通所述支撑片36的背面，所述保护片34的背面与所述支撑片36的背面齐平，即，所述保护片34背朝所述柔性屏32的侧面与所述支撑片36背朝所述柔性屏32的侧面齐平。
在其他实施例中，所述保护片34的背面与所述收容槽362的槽底之间设置有助滑物质。助滑物质可以为铁氟龙。当然，在其他实施例中，保护片与支撑片相向的表面上也可以涂覆上述助滑物质以降低二者之间的摩擦力。
在其他实施例中，所述收容槽362的开孔面积可以小于所述可折弯区域31的面积。
请参阅图5及图6所示，图5是本申请第三实施例中的电子装置的部分剖视结构示意图，图6是图5中VI部分的放大图。本申请的电子装置的第三实 施例的结构与第二实施例的结构相似，不同之处在于：在第三实施例中，保护片34的背面与所述收容槽362的内表面(即槽底面)之间有间隙364。当所述电子装置100通过所述铰链25折弯或展平时，所述保护片34在所述收容槽362内移动，但所述保护片34的背面与所述收容槽364的槽底面之间具有间隙364而不会摩擦接触，从而能更好地防止所述柔性屏32被磨损。
如图6所示，具体的，所述收容槽362包括面朝所述保护片34的背面的槽底面3621，以及相对的两个内侧面3623，每一内侧面3623平行于所述柔性屏32的弯曲轴。两个所述内侧面3623及所述槽底面3621共同围成所述收容槽362。所述槽底面3621与所述保护片34的背面，以及所述两个所述内侧面3623与所述保护片34对应的外侧面之间围成所述间隙364。所述支撑片36的厚度a为50微米至300微米之间(含本数)。所述保护片34的背面与所述槽底面3621之间的间隙的宽度b为10微米至300微米(含本数)。每一内侧面3623与所述保护片34的对应的外侧面之间的间隙c大于0微米。通过维持间隙宽度在上述范围，可以有效降低保护片34与支撑片36之间的摩擦，并得以控制整机的厚度。
请参阅图7及图8所示，图7是本申请第四实施例中的电子装置的部分剖视结构示意图，图8是图7中VIII部分的放大图。本申请的电子装置的第四实施例的结构与第三实施例的结构相似，不同之处在于：在第四实施例中，每一内侧面3623与所述槽底面3621的相交处设置有倒角3625，所述倒角3625能分散所述支撑片36在弯曲的过程中产生的应力，避免支撑片36在内侧面3623与槽底面3621相接的位置处产生过大的应力，以延长所述柔性屏32的使用寿命。
请参阅图9及图10所示，图9是本申请第五实施例中的电子装置的部分剖视结构示意图，图10是图9中X部分的放大图。本申请的电子装置的第五实施例的结构与第三实施例的结构相似，不同之处在于：在第五实施例中，每一内侧面3623与所述槽底面3621的相交处设置有圆角3626，所述柔性屏32在弯曲的过程中产生的应力集中随所述圆角3626的半径的增大而减小，使所述应力的分布趋于均匀，从而提高了所述柔性显示装置30的疲劳安全系数，以延长所述柔性屏32的使用寿命。
本实施例中，每一圆角3626的圆弧与所述支撑片36的槽底面3621相切 或者收容槽362的内侧面3623相切，从而使所述内侧面3623与所述槽底面3621的相交处的圆角3626的半径值较大。
请参阅图11所示，图11是本申请第六实施例中的电子装置的部分剖视结构示意图。本申请的电子装置的第六实施例的结构与第三实施例的结构相似，不同之处在于：在第六实施例中，所述保护片34的背面与所述支撑片36之间对应所述可折弯区域设置有润滑材料涂层39，即，所述保护片34的背面与所述支撑片36的收容槽362的面朝所述保护片34的背面的槽底面之间设置有润滑材料涂层39。所述润滑材料涂层39可以涂设于所述保护片34的背面，也可以涂设于所述收容槽362的面朝所述保护片34的背面的槽底面。当所述电子装置100通过所述铰链25折弯或展平时，所述保护片34的背面与所述收容槽364的槽底面之间相对滑动，由于所述保护片34的背面与所述收容槽362的槽底面之间设置有所述润滑材料涂层39，因此，从而能减少所述保护片34与所述支撑片36之间的摩擦系数，延长所述柔性屏32的寿命。
本实施例中，所述润滑材料涂层39为铁氟龙。
在其他实施例中，所述润滑材料层也可以是石墨、二硫化钼或热塑性聚氨酯弹性体橡胶等。
请参阅图12所示，图12是本申请第七实施例中的电子装置的部分剖视结构示意图。本申请的电子装置的第七实施例的结构与第五实施例的结构相似，不同之处在于：在第七实施例中，所述保护片34的背面与所述支撑片36之间对应所述可折弯区域设置有润滑材料涂层39，即，所述保护片34的背面与所述支撑片36的收容槽362的面朝所述保护片34的背面的槽底面之间设置有润滑材料涂层39。所述润滑材料涂层39可以涂设于所述保护片34的背面，也可以涂设于所述收容槽362的面朝所述保护片34的背面的槽底面。当所述电子装置100通过所述铰链25折弯或展平时，所述保护片34的背面与所述收容槽364的槽底面之间相对滑动，由于所述保护片34的背面与所述收容槽362的槽底面之间设置有所述润滑材料涂层39，因此，从而能减少所述保护片34与所述支撑片36之间的摩擦系数，延长所述柔性屏32的寿命。
可以理解地，在前述各实施例中，保护片与支撑片相向的二表面之间均可以设置润滑材料涂层，润滑材料涂层可以涂覆于保护片或支撑片的任何一个上，以减小二者之间的摩擦力。
请参阅图13所示，图13是本申请第八实施例中的电子装置的正面结构示意图。本申请的电子装置的第八实施例的结构与第三实施例的结构相似，不同之处在于：在第八实施例中，支撑片36的正面对应所述可折弯区域31开设有棱形的收容槽362，保护片34为收容于所述棱形的收容槽362内的棱形的液态金属片。所述棱形的收容槽362的其中一对称轴平行于所述柔性屏32的弯曲轴，所述棱形的收容槽362的另一对称轴垂直于所述柔性屏32的弯曲轴。所述保护片34设计成棱形能增强所述柔性屏32的耐弯折性。
请参阅图14所示，图14是本申请第九实施例中的电子装置的正面结构示意图。本申请的电子装置的第九实施例的结构与第八实施例的结构相似，不同之处在于：在第九实施例中，支撑片36的正面对应所述可折弯区域31开设有椭圆形的收容槽362，保护片34为收容于所述棱形的收容槽362内的椭圆形的液态金属片。
请参阅图15所示，图15是本申请第十实施例中的电子装置的正面结构示意图。本申请的电子装置的第十实施例的结构与第三实施例的结构相似，不同之处在于：在第十实施例中，支撑片36的正面对应所述可折弯区域31开设有相互间隔的若干收容槽362，每一收容槽362呈矩形，每一收容槽362沿垂直于所述柔性屏32的弯曲轴的方向延伸，每一收容槽362内设置有矩形的保护片34。若干矩形的所述保护片34能分散所述柔性屏32弯曲时的应力，从而增强所述柔性屏32的耐弯折性。
上述各实施例中，保护片34也可以呈图案化设置，即在保护片34上形成呈阵列式排布或队列式排布的图案。比如，保护片34可以包括呈阵列式分布的菱形片，各菱形片之间形成空隙并通过条形片连接。又比如，保护片34可以包括呈队列式排布的条形片，各条形片之间通过间隙隔开，各条形片的延伸方向垂直于所述柔性屏32的弯曲轴。通过图形化，使得保护片34的抗弯折性能增加。
可以理解地，除屏体层322外，本发明的柔性屏32也可以不包含或仅包含盖板层326及支撑膜324其中的任一种或多种或所有。
还可以理解地，本发明所称耐弯折材料指材料在弯折至少5000次以上不会发生断裂的材料。
还可以理解地，本发明所称“相对滑动”并不限定两个元件之间直接接触 并相对滑动，而是还可以包含间隔第三方元件相对滑动，第三方元件也并不限于实体元件，如片材、膜材等，而是还可以包含非实体元件，如间隙、空间等，或者是实体元件与非实体元件的组合；第三方元件也并不限定为一个，而是可以包含多个。也就是说，只要两个元件有相对滑动的运动关系，不管两个元件的实际位置如何，都可以认为是本发明所称的“相对滑动”的范围内。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围。

Claims (23)

  1. 一种柔性显示装置，包括柔性屏，其特征在于，所述柔性屏的背面层叠有由耐弯折材料制成的保护片，所述柔性屏设置有可折弯区域，所述保护片覆盖所述可折弯区域，所述柔性屏包括屏体层，所述保护片用于支撑所述屏体层。
  2. 如权利要求1所述的柔性显示装置，其特征在于，屏体层位于所述柔性显示装置的中性层位置。
  3. 如权利要求1所述的柔性显示装置，其特征在于，所述保护片的硬度大于所述屏体层的硬度。
  4. 如权利要求1所述的柔性显示装置，其特征在于，所述保护片为硅胶、泡棉、薄金属片、记忆合金中的至少任意一种。
  5. 如权利要求1所述的柔性显示装置，其特征在于，所述保护片为液态金属片。
  6. 如权利要求5所述的柔性显示装置，其特征在于，所述液态金属片为铜、钛、铁、锆、银、镍、镓、金、锑、镉、锌、铟、硅中至少一种的合金材料。
  7. 如权利要求5所述的柔性显示装置，其特征在于，所述液态金属片的弹性模量与柔性屏的弹性模量之差小于或等于100Gpa。
  8. 如权利要求1所述的柔性显示装置，其特征在于，所述保护片的背面设置有支撑片，所述支撑片由耐弯折材料制成，所述保护片与所述支撑片之间对应所述可折弯区域的区域可相对滑动。
  9. 如权利要求8所述的柔性显示装置，其特征在于，所述保护片的背面与所述支撑片之间对应所述可折弯区域的区域设置有间隙。
  10. 如权利要求8所述的柔性显示装置，其特征在于，所述支撑片的厚度大于或等于所述保护片的厚度，所述支撑片的强度大于所述保护片的强度。
  11. 如权利要求8所述的柔性显示装置，其特征在于，所述支撑片的正面对应所述可折弯区域开设有收容槽，所述保护片可滑动的收容于所述收容槽内。
  12. 如权利要求1所述的柔性显示装置，其特征在于，所述保护片的正面通过胶体固定贴合于所述柔性屏的背面。
  13. 如权利要求11所述的柔性显示装置，其特征在于，所述收容槽沿垂直于所述柔性屏的弯曲轴的方向延伸的长度大于所述保护片沿垂直于所述柔性屏的弯曲轴的方向延伸的长度。
  14. 如权利要求11所述的柔性显示装置，其特征在于，所述收容槽的厚度大于或等于所述保护片的厚度。
  15. 如权利要求11所述的柔性显示装置，其特征在于，所述收容槽包括面朝所述保护片的槽底面，以及相对的两内侧面。
  16. 如权利要求15所述的柔性显示装置，其特征在于，每一内侧面与所述槽底面的相交处设置有倒角。
  17. 如权利要求16所述的柔性显示装置，其特征在于，所述倒角是圆角。
  18. 如权利要求17所述的柔性显示装置，其特征在于，所述圆角的圆弧与所述支撑片的槽底面相切。
  19. 如权利要求18所述的柔性显示装置，其特征在于，每一内侧面平行于柔性屏的弯曲轴。
  20. 如权利要求8所述的柔性显示装置，其特征在于，所述支撑片对应所述可折弯区域开设有棱形、椭圆形或矩形的收容槽，保护片对应所述收容槽呈棱形、椭圆形或矩形。
  21. 如权利要求9所述的柔性显示装置，其特征在于，所述保护片的背面与所述支撑片之间对应所述可折弯区域设置有润滑材料涂层。
  22. 如权利要求21所述的柔性显示装置，其特征在于，所述润滑材料涂层为铁氟龙、石墨、二硫化钼或热塑性聚氨酯弹性体橡胶。
  23. 一种电子装置，包括壳体及根据权利要求1-22中任一项中所述的柔性显示装置，所述壳体包括第一框体、第二框体及连接于所述第一框体与所述第二框体之间的铰链，所述柔性显示装置设置于所述第一框体、第二框体及所述铰链上。
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