WO2020140233A1 - 透明叠层膜、显示装置及透明叠层膜的制造方法 - Google Patents

透明叠层膜、显示装置及透明叠层膜的制造方法 Download PDF

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Publication number
WO2020140233A1
WO2020140233A1 PCT/CN2019/070244 CN2019070244W WO2020140233A1 WO 2020140233 A1 WO2020140233 A1 WO 2020140233A1 CN 2019070244 W CN2019070244 W CN 2019070244W WO 2020140233 A1 WO2020140233 A1 WO 2020140233A1
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Prior art keywords
film layer
film
layer
transparent laminated
laminated film
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PCT/CN2019/070244
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English (en)
French (fr)
Inventor
谷朋浩
张家豪
蔡宝鸣
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京东方科技集团股份有限公司
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Priority to JP2020560967A priority Critical patent/JP7275167B2/ja
Priority to US16/640,522 priority patent/US11762416B2/en
Priority to PCT/CN2019/070244 priority patent/WO2020140233A1/zh
Priority to EP19861236.8A priority patent/EP3907076B1/en
Priority to CN201980000033.7A priority patent/CN111655486B/zh
Publication of WO2020140233A1 publication Critical patent/WO2020140233A1/zh

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Definitions

  • the embodiments of the present disclosure relate to a transparent laminated film, a display device, and a method of manufacturing a transparent laminated film.
  • the attached window film can prevent the surface of the display device from being scratched or scratched, and while protecting it, the window film can also ensure a high transmittance of its own material, thereby It will not affect the normal display of the display device.
  • At least one embodiment of the present disclosure provides a transparent laminated film for covering a display side of a display panel, including a first film layer, a center film layer, and a second film layer that are sequentially stacked, wherein the first film layer And the second film layer is a thermoplastic, and the center film layer is a thermosetting plastic.
  • thermoplastic plastic is a thermoplastic polyimide
  • thermosetting plastic is a thermosetting polyimide
  • the transmittance of the central film layer is greater than the transmittance of the first film layer and the second film layer.
  • the elastic modulus of the central film layer is greater than the elastic modulus of the first film layer and the elastic modulus of the second film layer.
  • the transmittance of the central film layer is greater than 90%, and the elastic modulus of the central film layer is greater than 6 GPa.
  • the transmittance of at least one of the first film layer and the second film layer is greater than 70%, and the first film layer and all The elastic modulus of at least one of the second film layers is greater than 2.5 GPa.
  • the comprehensive transmittance of the transparent laminated film is greater than 85%, and the comprehensive elastic modulus of the transparent laminated film is greater than 5.5 GPa.
  • the thickness of the central film layer is 50-80 ⁇ m, and the thickness of at least one of the first film layer and the second film layer is 5 -10 ⁇ m.
  • the moisture absorption rate of the first film layer, the second film layer, and the center film layer is less than 1.0, and the The comprehensive moisture absorption rate is less than 1.0.
  • the glass transition temperature of the central film layer is greater than 400°C, and at least one of the first film layer and the second film layer The glass transition temperature is 220-260°C.
  • the first film layer, the center film layer, and the second film layer are directly laminated by hot pressing.
  • the transparent laminated film provided by at least one embodiment of the present disclosure further includes a protective layer, wherein the protective layer is laminated on a side of the first film layer or the second film layer away from the central film layer, And the hardness of the protective layer is greater than the hardness of the first film layer or the second film layer.
  • the thickness of the protective layer is 5-10 ⁇ m.
  • At least one embodiment of the present disclosure further provides a display device including a display panel and the transparent laminated film according to any embodiment of the present disclosure covering the display side of the display panel.
  • the display panel is a flexible organic light emitting diode display panel.
  • the display device provided by at least one embodiment of the present disclosure further includes a polarizer and a touch structure layer, wherein the polarizer and the touch structure layer are stacked on the display panel and the transparent laminated film between.
  • the transparent laminated film further includes a protective layer
  • the protective layer is laminated on a side of the transparent laminated film away from the display panel, and the The hardness of the protective layer is greater than the hardness of the first film layer or the second film layer.
  • At least one embodiment of the present disclosure further provides a method for manufacturing a transparent laminated film according to any embodiment of the present disclosure, including: laminating the first film layer and the second film layer to the Both sides of the central membrane.
  • the hot pressing includes hot pressing of a pressing roller or hot pressing of a laminate.
  • the temperature of the hot pressing is 300 to 350° C.
  • the pressure is 0.8 to 1.0 Newton
  • the duration is 10 to 30 seconds.
  • the method for manufacturing a transparent laminated film further includes: forming a protective layer on a side of the first film layer or the second film layer away from the central film layer, wherein The hardness of the protective layer is greater than the hardness of the first film layer or the second film layer.
  • Figure 1 is a schematic structural view of a single-layer transparent window film
  • Figure 2 is a schematic structural view of a double-layer transparent window film
  • FIG. 3 is a schematic diagram of a layer structure of a transparent laminated film provided by some embodiments of the present disclosure
  • FIG. 4 is a schematic diagram of another transparent laminated film provided by some embodiments of the present disclosure.
  • FIG. 5 is a schematic flowchart of a method for manufacturing a transparent laminated film provided by some embodiments of the present disclosure
  • FIG. 6 is a schematic diagram of a specific example of a method for hot-pressing a transparent laminated film provided by some embodiments of the present disclosure
  • FIG. 7 is a schematic diagram of a specific example of another method for hot-pressing a transparent laminated film provided by some embodiments of the present disclosure.
  • FIGS. 8A and 8B are schematic structural diagrams of a display device provided by some embodiments of the present disclosure.
  • FIG. 9 is a schematic structural diagram of another display device provided by some embodiments of the present disclosure.
  • window films As the uppermost surface of the display module, based on the glass's high transmittance, high hardness, scratch resistance and other properties, window films have used protective glass in the past. However, faced with the development of flexible display and even folding display technology, such a high-thickness protective glass solution is obviously not competent. At present, the development of window films applied to flexible displays and folding displays is mainly concentrated on ultra-thin glass and high-performance transparent film materials. Due to the performance requirements of flexible display and folding display in terms of bending resistance, strong response and small creases, transparent thermosetting polyimide (Polyimide, PI) has become the mainstream material of window films for flexible display products.
  • Polyimide Polyimide
  • the rigidity and pressure resistance of the transparent thermosetting PI film material are affected; on the other hand, when the thickness of the window film increases, the transparent thermosetting PI film material itself The large stress makes it extremely easy to warp, which causes great difficulties in the preparation, bonding and use of the display device.
  • thermosetting PI film materials There are usually two solutions to improve the warpage of single-layer transparent thermosetting PI film materials.
  • One is to set a hard coating layer on both sides of the thermosetting PI film layer, and the other is to adopt a double-layer thermosetting PI film layer structure.
  • FIG. 1 is a schematic structural diagram of a single-layer transparent window film 100.
  • the transparent window film 100 includes a single transparent thermosetting PI film layer 110 and hard coating layers 120 and 130 disposed on both sides of the transparent thermosetting PI film layer 110.
  • the hard coatings 120 and 130 enable the transparent window film 100 to have a certain flatness and meet the performance requirements of scratch resistance, but at the same time also limit the bending performance of the transparent window film 100.
  • the hard coatings 120 and 130 will also affect the pressure resistance performance of the transparent window film 100. Once the hard coating 120 or 130 breaks, it will cause a cracked visual phenomenon in the display area of the display device using the transparent window film 100 , Affect the display effect of the screen.
  • processing the hard coating layers 120 and 130 to the two sides of the transparent thermosetting PI film layer 110 needs to provide a great stress, which makes the preparation process more difficult and is not easy to apply to large-scale actual production.
  • FIG. 2 is a schematic structural diagram of a double-layer transparent window film 200.
  • the transparent window film 200 includes two layers of transparent thermosetting PI film layers 210 and 220, and a pressure-sensitive adhesive layer 230 is used for bonding between the transparent thermosetting PI film layers 210 and 220.
  • the pressure-sensitive adhesive layer 230 Usually optical glue is used.
  • the structure of the double-layer transparent thermosetting PI film layer can enable the transparent window film 200 to meet good pressure resistance, the elastic modulus and response performance of the pressure-sensitive adhesive layer 230 cannot meet the bending requirements of the folded display, and is transparent There is a big difference in the thermosetting PI film layer, which causes damage to the bending effect and the return performance of the transparent window film 200.
  • the adhesive structure is extremely vulnerable to time Due to the influence of the surrounding environmental conditions, there is a risk of peeling between the transparent thermosetting PI film layers 210 and 220, and also a stress mismatch.
  • At least one embodiment of the present disclosure provides a transparent laminated film using a laminated design of a central thermosetting film layer and upper and lower thermoplastic film layers to form a window for a display device with a multi-layer structure
  • the membrane material solves the problem of warpage of the membrane material itself, and improves the flatness of the membrane material surface.
  • the transparent laminated film of some embodiments of the present disclosure on the basis of improving the transmittance, the central thermosetting film layer and the upper and lower thermoplastic film layers also ensure a certain flexibility, so that the transparent laminated film can achieve better bending Effect and response performance.
  • the transparent laminated film can be prepared by a hot-press lamination process, eliminating the large stress required to prepare a single-layer transparent thermosetting PI film layer, or a double-layer transparent thermosetting PI film
  • the adhesive structure of the layer simplifies the processing technology of the film layer, thereby greatly improving the success rate of the preparation.
  • At least one embodiment of the present disclosure also provides a method for manufacturing the above transparent laminated film and a display device including the above transparent laminated film.
  • At least one embodiment of the present disclosure provides a transparent laminated film including a first film layer, a center film layer, and a second film layer stacked in sequence, wherein the first film layer and the second film layer are thermoplastic ,
  • the central membrane layer is thermosetting plastic.
  • FIG. 3 is a schematic diagram of a layer structure of a transparent laminated film 300 provided by some embodiments of the present disclosure.
  • the transparent laminated film 300 includes a first film layer 310, a center film layer 330, and a second film layer 320 that are sequentially stacked.
  • the first film layer 310 and the second film layer 320 are thermoplastics, and the central film layer 330 is thermosetting plastic.
  • the transparent laminated film 300 adopts the laminated design of the central film layer 330, the first film layer 310 and the second film layer 320 to avoid or reduce the warpage of the plastic film material and improve the flatness of the surface of the transparent laminated film 300 .
  • thermoplastics used for the first film layer 310 and the second film layer 320 may be thermoplastic polyimide (Thermoplastic Polyimide, TPI); the thermosetting plastics used for the central film layer 330 may be thermosetting polyimide (Polyimide, PI ), for example, including bismaleimide (BMI) type and monomer reactant polymerization (PMR) type polyimides and their respective modified products.
  • thermoplastic polyimide and thermosetting polyimide can use commercially available raw materials. Compared with thermosetting PI, thermoplastic PI is less brittle and has better bending properties.
  • the amount of expansion and contraction of the first film layer 310 and the second film layer 320 located on the outer layer needs to be greater than that of the central film layer 330. Therefore, the thermoplastic PI with better bending performance is used.
  • the one film layer 310 and the second film layer 320 can make the transparent laminated film 300 satisfy the performance characteristics of easy stretch shrinkage and easy elastic deformation, thereby enabling the transparent laminated film 300 to achieve better bending effect and response performance.
  • the thermoplastic PI and the thermosetting PI have different glass transition temperatures and good thermoplastic processing properties.
  • the transparent laminated film 300 can be prepared by a vacuum high temperature and high pressure method, thereby eliminating the adhesion of the optical glue and ensuring
  • the bending effect and response performance of the transparent laminated film 300 simplify the processing technology of the film layer and greatly improve the success rate of the preparation.
  • the bonding direction of the transparent laminated film 300 is not limited, and the display device may be in contact with the first film layer 310 of the transparent laminated film 300, or It is in contact with the second film layer 320, which is not limited in the embodiments of the present disclosure.
  • the transmittance and elastic modulus of the first film layer 310, the second film layer 320, and the central film layer 330 may be different.
  • the transmittance of each film layer can be determined by its own material properties, for example, the transmittance of the first film layer 310 and the second film layer 320 can be changed by adjusting the yellowing value of the thermoplastic PI, thereby making the transparent laminate
  • the comprehensive transmittance of the film 300 satisfies the requirements of screen display.
  • each film layer The bending effect and response performance of each film layer are related to the elastic modulus of the film layer, that is, in the case where each film layer can guarantee a certain flexibility, the smaller the elastic modulus of the film layer, the better the bending effect of the film layer , And the greater the modulus of elasticity of the film layer, the better the coating performance. Therefore, some embodiments of the present disclosure select and combine different elastic moduli for each film layer according to actual needs, and each film layer cooperates with each other, so that the comprehensive elastic modulus of the transparent laminated film 300 meets the requirement of bending, so that The transparent laminated film 300 as a whole has a good bending effect and response performance.
  • the transmittance of the central film layer 330 is greater than the transmittance of the first film layer 310 and the transmittance of the second film layer 320
  • the elastic modulus of the central film layer 330 is greater than the elastic modulus of the first film layer 310 and The elastic modulus of the second film layer 320.
  • the thickness of the center film layer 330 is generally greater than the thickness of the first film layer 310 and the second film layer 320, so the high-transmittance center film layer 330 can make the transparent laminated film 300 have a higher comprehensive transmittance, Thereby achieving high-quality picture display effect.
  • the transmittance of the central film layer 330 is greater than 90%, and the elastic modulus of the central film layer 330 is greater than 6 GPa.
  • the transmittance of the first film layer 310 and/or the second film layer 320 is greater than 70%, and the elastic modulus of the first film layer 310 and/or the second film layer 320 is greater than 2.5 GPa.
  • the comprehensive elastic modulus of the transparent laminated film 300 is greater than 5.5 GPa, and the comprehensive transmittance of the transparent laminated film 300 is greater than 85%.
  • the comprehensive transmittance of the transparent laminated film 300 may further be greater than 90%.
  • the display panel to which the transparent laminated film 300 is attached can achieve a better picture display effect.
  • the elastic modulus and transmittance of the first film layer 310 and the second film layer 320 may be the same or different.
  • both sides of the central film layer 330 are subjected to the same stress, and thus the warpage of the transparent laminated film 300 can be better Improve, and better ensure the flatness of the surface of the transparent laminated film 300.
  • the elastic modulus of the first film layer 310/second film layer 320 away from the display device may be smaller than that of the second film layer 320/first film layer 310 Elastic Modulus.
  • the thickness of the central film layer 330 is 50-80 ⁇ m
  • the thickness of the first film layer 310 and/or the second film layer 320 is 5-10 ⁇ m
  • the overall thickness of the transparent laminated film 300 may be 60-100 ⁇ m.
  • the thickness of the double-layer transparent window film 200 shown in FIG. 2 is often between 160-200 ⁇ m. Therefore, compared with the double-layer transparent window film 200, the transparent laminated film 300 of some embodiments of the present disclosure is lighter and thinner, and at the same time, a higher comprehensive transmittance can be achieved.
  • the thicknesses of the first film layer 310 and the second film layer 320 may be the same or different, depending on factors such as the interface where the first film layer 310 and the second film layer 320 are in contact, the position in the laminated structure, etc. It depends.
  • the moisture absorption rates of the first film layer 310, the second film layer 320, and the central film layer 330 are all less than 1.0, for example, may be 0.5 to 0.9, and the comprehensive moisture absorption rate of the transparent laminated film 300 is less than 1.0, so that the transparent laminate Various properties of the film 300 such as scratch resistance, pressure resistance, easy stretching and contraction, etc. can be improved.
  • the glass transition temperature of the central film layer 330 is greater than 400°C, and the glass transition temperature of the first film layer 310 and/or the second film layer 320 is 220-260°C, so that the first film layer 310, the center
  • the film layer 330 and the second film layer 320 can be prepared by hot pressing, eliminating the large stress required to prepare the single-layer transparent window film 100 shown in FIG. 1 or the double-layer transparent shown in FIG. 2
  • the adhesive structure of the window film 200 simplifies the processing technology of the film layer and greatly improves the success rate of preparation.
  • the transparent laminated film 300 including the first film layer 310, the center film layer 330, and the second film layer 320 may be directly laminated by stacking the raw material layers used for the above-mentioned film layers 310, 320, and 330, and then the laminate is hot pressed Yes, this will be explained in detail below.
  • FIG. 4 is a schematic diagram of another transparent laminated film 400 according to some embodiments of the present disclosure.
  • the transparent laminated film 400 of this embodiment is basically the same as the transparent laminated film 300 shown in FIG. 3 except that the protective layer 340 is further included.
  • the protective layer 340 is stacked on the side of the first film layer 310 away from the central film layer 330, and the hardness of the protective layer 340 is greater than the hardness of the first film layer 310 or the second film layer 320.
  • the protective layer 340 may be an inorganic coating.
  • aluminum oxide, silicon oxide, diamond-like carbon, or other suitable materials may be used and prepared by methods such as chemical vapor deposition, physical vapor deposition (such as sputtering), plasma spraying, and the like.
  • the protective layer 340 can further improve the flatness and scratch resistance of the transparent laminated film 400, thereby further protecting the display device including the transparent laminated film 400.
  • the thickness of the protective layer 340 may be 5-10 ⁇ m, so as to ensure that the overall thickness of the transparent laminated film 400 is small, so that the comprehensive transmittance of the transparent laminated film 400 will not be affected.
  • the protective layer 340 is stacked on the side of the first film layer 310 away from the central film layer 330, while in some other embodiments of the present disclosure, the protective layer 340 may also Laminated on the side of the second film layer 320 away from the central film layer 330.
  • the stacked protective layer 340 is on the side of the transparent laminated film 400 away from the display panel.
  • At least one embodiment of the present disclosure further provides a method for manufacturing a transparent laminated film according to any embodiment of the present disclosure, including: laminating the first film layer and the second film layer to the Both sides of the central membrane.
  • the manufacturing method can save the large stress required for preparing the single-layer transparent thermosetting PI film layer, or the adhesive structure of the double-layer transparent thermosetting PI film layer, which simplifies the processing technology of the film layer, thereby greatly improving the preparation success rate.
  • FIG. 5 is a schematic flowchart of a method for manufacturing a transparent laminated film provided by some embodiments of the present disclosure.
  • the transparent laminated film 300 or the transparent laminated film 400 described in any of the embodiments of the present disclosure can be manufactured by using the manufacturing method of the transparent laminated film.
  • the method for manufacturing the transparent laminated film 300 includes step S10: laminating the first film layer 310 and the second film layer 320 to both sides of the central film layer 330 by hot pressing .
  • the manufacturing method of the transparent laminated film 400 further includes step S20: plating on the side of the first film layer 310 (or the second film layer 320) away from the central film layer 330 ⁇ 340.
  • the hot pressing includes press roller hot pressing or laminate hot pressing.
  • FIG. 6 is a schematic diagram of a specific example of a method for hot-pressing a transparent laminated film 300 provided by some embodiments of the present disclosure.
  • the first film layer 310 and the second film layer 320 may be hot-press laminated to the two sides of the central film layer 330 through the first layer plate 410 and the second layer plate 420, respectively.
  • a unidirectional pressing method or a bidirectional pressing method may be used; in the unidirectional pressing method, for example, the second layer 420 is placed on a stationary base, in the case shown in FIG. 6 , The pressure is applied to the first layer plate 410 from top to bottom; in the two-way pressure method, in the situation shown in FIG.
  • the first pressure is applied to the first layer plate 410 from top to bottom
  • the second pressure It is applied to the second layer 420 from bottom to top
  • the first film layer 310 and the second film layer 320 use thermoplastic polyimide
  • the center film layer 330 uses thermosetting polyimide.
  • the first layer 410 and the second layer 420 are not only used for applying pressure, but also have a heating function (for example, heating by resistance or heating by hot gas or hot oil); or, they can be provided separately heating equipment.
  • the temperature of the hot-press lamination is 300-350° C.
  • the pressure is 0.8-1.0 Newton
  • the duration is 10 to 30 seconds.
  • the glass transition temperature of the central film layer 330 using thermosetting PI is greater than 400°C
  • the glass transition temperature of the first film layer 310 and/or the second film layer 320 using thermoplastic PI is 220-260°C. Therefore,
  • the hot pressing lamination temperature selected by the hot pressing method is between 300 and 350°C, which can ensure the realization of the hot pressing process, so that the manufacturing method of the transparent laminated film 300 provided by the embodiment of the present disclosure can be applied to In actual production.
  • FIG. 7 is a schematic diagram of a specific example of another method for hot-pressing a transparent laminated film 300 provided by some embodiments of the present disclosure.
  • the first film layer 310 and the second film layer 320 may be hot-pressed and laminated to both sides of the central film layer 330 by the first pressing roller 510 and the second pressing roller 520, respectively; and, during the hot pressing process It is also possible to use a one-way pressure method or a two-way pressure method.
  • the first film layer 310 and the second film layer 320 use thermoplastic polyimide
  • the center film layer 330 uses thermosetting polyimide.
  • the first pressure roller 510 and the second pressure roller 520 are not only used for applying pressure, but also have a heating function (for example, heating by resistance or heating by hot gas or hot oil); or, they can be provided separately heating equipment.
  • a heating function for example, heating by resistance or heating by hot gas or hot oil
  • the temperature of the hot-press lamination may also be 300-350° C.
  • the pressure may also be It is 0.8 to 1.0 Newton
  • the duration can also be 10 to 30 seconds.
  • At least one embodiment of the present disclosure further provides a display device including a display panel and a transparent laminated film according to any embodiment of the present disclosure covering the display side of the display panel, for example, the transparent The laminated film 300, or the transparent laminated film 400 of the embodiment shown in FIG. Since the transparent laminated film in the display device avoids the warpage problem existing in the film material itself, the flatness of the surface of the display device can be improved.
  • the transparent laminated film in the display device can also enable the display device to meet the performance requirements of pressure resistance and scratch resistance; in some embodiments of the present disclosure, the transparent stack in the display device The layer film can also enable the display device to achieve good bending effect and response performance.
  • FIG. 8A and 8B are schematic structural diagrams of a display device 10 provided by some embodiments of the present disclosure.
  • the display device 10 includes a display panel 600 and a transparent laminated film 300 shown in FIG. 3 covering the display side of the display panel 600; or as shown in FIG. 8B, the display device 10 includes a display panel 600 and the transparent laminated film 400 shown in FIG. 4 covering the display side of the display panel 600.
  • the display panel 600 when the transparent laminated film 300 is attached to the display panel 600, the display panel 600 may be in contact with the second film layer 320 of the transparent laminated film 300. In some other embodiments of the present disclosure, the display panel 600 may also be in contact with the first film layer 310 of the transparent laminated film 300, which is not limited in the embodiments of the present disclosure.
  • the protective layer 340 is on the side of the transparent laminated film 400 away from the display panel 600, and the first layer of the display panel 600 and the transparent laminated film 400 The second film layer 320 is in contact.
  • the display panel 600 is in contact with the first film layer 310 of the transparent laminated film 400.
  • the display panel 600 may be a flexible organic light emitting diode (OLED) display panel, a quantum dot light emitting diode (PLED) display panel, a liquid crystal display panel, an electronic paper display panel, and the like.
  • OLED organic light emitting diode
  • PLED quantum dot light emitting diode
  • the display device 10 may further include more components and structures. These components and structures should be understood by those of ordinary skill in the art, and will not be repeated here. It should not be taken as a limitation on the embodiments of the present disclosure.
  • the display devices of some embodiments of the present disclosure may further include a polarizer, a touch control layer, and the like.
  • the transparent laminated film 300 shown in FIG. 3 is taken as an example for description below.
  • the display device 20 may further include a polarizer 610 and a touch structure layer 620.
  • the polarizer 610 and the touch structure layer 620 are stacked on the display panel Between 600 and the transparent laminated film 300.
  • the polarizer 610 is sandwiched between the display panel 600 and the touch structure layer 620, and the touch structure layer 620 is sandwiched between the polarizer 610 and the transparent laminated film 300, and the display panel 600 and the polarized light can be
  • a plurality of components such as the sheet 610, the touch control structure layer 620, and the transparent laminated film 300 are bonded together.
  • the polarizer 610 is a circular polarizer.
  • the circular polarizer includes a stacked linear polarizing layer and a quarter-wave plate.
  • the linear polarizing layer is located on the display side.
  • the axis of the quarter-wave plate is polarized with the linear polarizing layer. The axis is at an angle of 45 degrees, so when external light passes through the circular polarizer, it is converted into circular polarized light. After the circular polarized light is reflected back by the electrodes in the display panel 600, it passes through the quarter wave plate for the second time.
  • the polarizer 610 can absorb the external light directed to the display device 20, thereby reducing the interference of external ambient light and improving the contrast of the display image of the display device 20.
  • the type of the touch structure layer 620 may include resistive, capacitive, infrared, acoustic, or other types.
  • the capacitive touch unit may include a self-capacitance type or a mutual capacitance type, for example, including multiple touch units. When an external object (such as a finger) approaches, the capacitance value of the capacitive touch unit will change, so that the touched position of the display device 20 can be detected.
  • the embodiments of the present disclosure do not limit the type and specific structure of the touch structure layer 620.
  • the display panel 600 may have a built-in touch structure (ie, In-cell type touch structure).
  • the display device 20 may further include a base substrate 630 disposed on the side of the display panel 600 away from the transparent laminated film 300.
  • the base substrate 630 may be a glass substrate, a plastic substrate or other flexible substrates.
  • the display device 10 and the display device 20 may be liquid crystal panels, electronic paper, OLED panels, mobile phones, tablet computers, televisions, monitors, notebook computers, digital photo frames, navigators, and any other products or components with display functions.
  • This disclosure does not limit this.

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Abstract

一种透明叠层膜(300)、显示装置(10)及透明叠层膜(300)的制造方法，该透明叠层膜(300)包括依次层叠的第一膜层(310)、中心膜层(330)和第二膜层(320)，其中，第一膜层(310)和第二膜层(320)为热塑性塑料，中心膜层(330)为热固性塑料。该透明叠层膜(300)可以用于避免膜材的翘曲。

Description

透明叠层膜、显示装置及透明叠层膜的制造方法 技术领域
本公开的实施例涉及一种透明叠层膜、显示装置及透明叠层膜的制造方法。
背景技术
随着显示技术的发展，显示装置逐渐应用到诸多领域，成为了应用最为广泛的电子设备之一。近年来，随着折叠显示的开发浪潮，对于柔性显示装置的各种膜材要求也相继提出。作为显示模组的最上侧表面，贴附的窗膜可以防止显示装置的表面被刮擦或划伤，并且在起到保护作用的同时，窗膜还可以保证自身材质的高透过率，从而不会影响显示装置的正常显示。
发明内容
本公开至少一个实施例提供一种用于覆盖在显示面板的显示侧的透明叠层膜，包括依次层叠的第一膜层、中心膜层和第二膜层，其中，所述第一膜层和所述第二膜层为热塑性塑料，所述中心膜层为热固性塑料。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述热塑性塑料为热塑性聚酰亚胺，所述热固性塑料为热固性聚酰亚胺。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述中心膜层的透过率大于所述第一膜层和所述第二膜层的透过率。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述中心膜层的弹性模量大于所述第一膜层的弹性模量和所述第二膜层的弹性模量。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述中心膜层的透过率大于90％，且所述中心膜层的弹性模量大于6GPa。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述第一膜层和所述第二膜层中至少之一的透过率大于70％，所述第一膜层和所述第二膜层中至少之一的弹性模量大于2.5GPa。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述透明叠层膜 的综合透过率大于85％，且所述透明叠层膜的综合弹性模量大于5.5GPa。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述中心膜层的厚度为50-80μm，所述第一膜层和所述第二膜层中至少之一的厚度为5-10μm。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述第一膜层、所述第二膜层和所述中心膜层的吸湿率小于1.0，且所述透明叠层膜的综合吸湿率小于1.0。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述中心膜层的玻璃化转化温度大于400℃，且所述第一膜层和所述第二膜层中至少之一的玻璃化转化温度为220～260℃。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述第一膜层、所述中心膜层和所述第二膜层通过热压直接层叠得到。
例如，本公开至少一个实施例提供的透明叠层膜还包括保护层，其中，所述保护层层叠在所述第一膜层或所述第二膜层远离所述中心膜层的一侧，且所述保护层的硬度大于所述第一膜层或所述第二膜层的硬度。
例如，在本公开至少一个实施例提供的透明叠层膜中，所述保护层的厚度为5-10μm。
本公开至少一个实施例还提供一种显示装置，包括显示面板和覆盖在所述显示面板的显示侧的本公开任一实施例所述的透明叠层膜。
例如，在本公开至少一个实施例提供的显示装置中，所述显示面板为柔性有机发光二极管显示面板。
例如，本公开至少一个实施例提供的显示装置还包括偏光片和触控结构层，其中，所述偏光片和所述触控结构层层叠设置在所述显示面板与所述透明叠层膜之间。
例如，在本公开至少一个实施例提供的显示装置中，所述透明叠层膜还包括保护层，所述保护层层叠在所述透明叠层膜远离所述显示面板的一侧，且所述保护层的硬度大于所述第一膜层或所述第二膜层的硬度。
本公开至少一个实施例还提供一种本公开任一实施例所述的透明叠层膜的制造方法，包括：将所述第一膜层和所述第二膜层分别热压层叠至所述中心膜层的两侧。
例如，在本公开至少一个实施例提供的透明叠层膜的制造方法中，所述热压包括压辊热压或层板热压。
例如，在本公开至少一个实施例提供的透明叠层膜的制造方法中，所述热压的温度为300～350℃，压力为0.8～1.0牛顿，持续时间为10～30秒。
例如，本公开至少一个实施例提供的透明叠层膜的制造方法还包括：在所述第一膜层或所述第二膜层远离所述中心膜层的一侧形成保护层，其中，所述保护层的硬度大于所述第一膜层或所述第二膜层的硬度。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1为一种单层透明窗膜的结构示意图；
图2为一种双层透明窗膜的结构示意图；
图3为本公开一些实施例提供的一种透明叠层膜的层结构示意图；
图4为本公开一些实施例提供的另一种透明叠层膜的层结构示意图；
图5为本公开一些实施例提供的一种透明叠层膜的制造方法的流程示意图；
图6为本公开一些实施例提供的一种透明叠层膜的热压方法的具体示例的示意图；
图7为本公开一些实施例提供的另一种透明叠层膜的热压方法的具体示例的示意图；
图8A和图8B为本公开一些实施例提供的一种显示装置的结构示意图；以及
图9为本公开一些实施例提供的另一种显示装置的结构示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描 述的本公开的实施例，本领域普通技术人员在无需创造性劳动的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。
除非另作定义，此处使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”、“一”或者“该”等类似词语也不表示数量限制，而是表示存在至少一个。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。
作为显示模组的最上侧表面，基于玻璃的高透过率以及硬度较高、耐划伤等性能，窗膜以往多采用防护玻璃。但是，面临柔性显示甚至折叠显示技术的开发，此类高厚度的防护玻璃方案显然无法胜任。目前，对于应用于柔性显示和折叠显示的窗膜的开发主要集中在超薄玻璃以及高性能的透明膜材上。由于柔性显示和折叠显示对耐弯折、回覆性强及折痕小等方面的性能要求，透明热固性聚酰亚胺(Polyimide,PI)成为了柔性显示产品的窗膜的主流材料。
但是，一方面因为需要对显示装置的窗膜厚度进行限制，使得透明热固性PI膜材的刚性及耐压性能受到影响；另一方面，在窗膜厚度增大时，由于透明热固性PI膜材本身具有的大应力使得其极易发生翘曲，对显示装置的制备、贴合及使用都造成了很大困难。
改善单层透明热固性PI膜材的翘曲问题通常有两种解决方案。一种是在热固性PI膜层的双面各设置一层硬质涂层，另一种是采用双层热固性PI膜层结构。
图1为一种单层透明窗膜100的结构示意图。如图1所示，透明窗膜100包括单层透明热固性PI膜层110以及设置在透明热固性PI膜层110两侧的硬质涂层120和130。硬质涂层120和130使得透明窗膜100能够具有一定的平整性并且满足耐刮擦的性能需求，但同时也使透明窗膜100的弯折性能受到限制。此外，硬质涂层120和130还会影响透明窗膜100的耐压性能，一旦硬质涂层120或130发生断裂，则会在采用透明窗膜100的显示装置的显示区造成裂纹视觉现象，影响画面的显示效果。同时，将硬质涂层120和 130加工到透明热固性PI膜层110两侧需要提供很大的应力，使制备工艺难度增大，不便于应用到大规模的实际生产中。
图2为一种双层透明窗膜200的结构示意图。如图2所示，透明窗膜200包括双层透明热固性PI膜层210和220，并且在透明热固性PI膜层210和220之间采用压敏胶层230进行粘合，该压敏胶层230通常采用光学胶。虽然双层透明热固性PI膜层的结构可以使透明窗膜200满足较好的耐压性能，但是由于压敏胶层230的弹性模量及回覆性能无法满足折叠显示的弯折需求，且与透明热固性PI膜层存在较大差异，对透明窗膜200的弯折效果及回覆性能造成了损害。同时，由于压敏胶层230与透明热固性PI膜层210及220的弹性模量存在较大差异且膜层210和220仅通过压敏胶层230进行胶黏，该胶黏结构极易受到时间及周围环境条件的影响，因而透明热固性PI膜层210和220之间会存在剥离的风险，并且还会造成应力的不匹配。
基于上述问题，本公开至少一个实施例提供一种透明叠层膜，该透明叠层膜采用中心热固性膜层与上下热塑性膜层的层叠设计，形成了多膜层结构的用于显示装置的窗膜材料，从而解决了膜材本身存在的翘曲问题，提高了膜材表面的平整性。
本公开的一些实施例的透明叠层膜，在改善透过率的基础上，中心热固性膜层及上下热塑性膜层还保证了一定的柔性，使该透明叠层膜可以实现更好的弯折效果及回覆性能。
此外，在本公开的一些实施例中，透明叠层膜可以采用热压层叠的工艺方法进行制备，省去了制备单层透明热固性PI膜层所需的大应力，或者双层透明热固性PI膜层的胶黏结构，使膜层的加工工艺得到简化，从而大大提升了制备的成功率。
本公开至少一个实施例还提供一种上述透明叠层膜的制造方法以及包括上述透明叠层膜的显示装置。
下面，将参考附图详细地说明本公开的一些实施例。应当注意的是，不同的附图中相同的附图标记将用于指代已描述的相同的元件。
本公开至少一个实施例提供一种透明叠层膜，包括依次层叠的第一膜层、中心膜层和第二膜层，其中，所述第一膜层和所述第二膜层为热塑性塑料，所述中心膜层为热固性塑料。
图3为本公开一些实施例提供的一种透明叠层膜300的层结构示意图。如图3所示，该透明叠层膜300包括依次层叠的第一膜层310、中心膜层330和第二膜层320。第一膜层310和第二膜层320为热塑性塑料，中心膜层330为热固性塑料。该透明叠层膜300通过采用中心膜层330与第一膜层310以及第二膜层320的层叠设计，避免或减弱了塑料膜材的翘曲，提高了透明叠层膜300表面的平整性。
例如，第一膜层310和第二膜层320采用的热塑性塑料可以为热塑性聚酰亚胺(Thermoplastic Polyimide,TPI)；中心膜层330采用的热固性塑料可以为热固性聚酰亚胺(Polyimide,PI)，例如包括双马来酰亚胺(BMI)型和单体反应物聚合(PMR)型聚酰亚胺及其各自改性的产品等。例如，热塑性聚酰亚胺和热固性聚酰亚胺都可以采用市售的原材料。相比于热固性PI，热塑性PI的脆性较小，并且具有更好的弯折性能。在透明叠层膜300弯折时，位于外层的第一膜层310和第二膜层320的膨胀和收缩量需要大于中心膜层330，因此，采用弯折性能更好的热塑性PI的第一膜层310和第二膜层320可以使透明叠层膜300满足易拉伸收缩以及易弹性形变的性能特点，从而使透明叠层膜300实现更好的弯折效果及回覆性能。同时，热塑性PI与热固性PI的玻璃化转化温度不同且具有良好的热塑加工性能，因此透明叠层膜300可以采用真空高温高压的方法进行制备，从而省去了光学胶的胶黏，保证了透明叠层膜300的弯折效果及回覆性能，并且简化了膜层的加工工艺，使制备的成功率大大提升。
需要说明的是，当透明叠层膜300与显示面板贴合时，透明叠层膜300的贴合方向不受限制，显示器件可以与透明叠层膜300的第一膜层310接触，也可以与第二膜层320接触，本公开实施例对此不作限制。
本公开的一些实施例中，第一膜层310、第二膜层320和中心膜层330的透过率以及弹性模量可以不同。各膜层的透过率例如可以由其本身的材料特性决定，例如可以通过调节热塑性PI的黄化值来改变第一膜层310和第二膜层320的透过率，从而使得透明叠层膜300的综合透过率满足画面显示的需求。各膜层的弯折效果及回覆性能与膜层的弹性模量相关，即在各膜层均可以保证一定柔性的情形下，膜层的弹性模量越小，膜层的弯折效果越好，且膜层的弹性模量越大，膜层的回覆性能越好。因此，本公开的一些实施例 根据实际需要为各膜层选取不同的弹性模量来进行组合，各膜层彼此配合，从而使得透明叠层膜300的综合弹性模量满足弯折的需求，使透明叠层膜300整体上具有良好的弯折效果及回覆性能。
例如，中心膜层330的透过率大于第一膜层310的透过率和第二膜层320的透过率，中心膜层330的弹性模量大于第一膜层310的弹性模量和第二膜层320的弹性模量。这样，弹性模量较高的中心膜层330使得透明叠层膜300具有很好的弯折回覆性能，同时弹性模量较小的第一膜层310和第二膜层320又保证了一定的柔性，使透明叠层膜300的弯折效果满足需求。例如，中心膜层330的厚度通常大于第一膜层310和第二膜层320的厚度，因此高透过率的中心膜层330可以使得透明叠层膜300具有较高的综合透过率，从而实现优质的画面显示效果。
例如，在一个示例中，中心膜层330的透过率大于90％，且中心膜层330的弹性模量大于6GPa。例如，第一膜层310和/或所述第二膜层320的透过率大于70％，且第一膜层310和/或第二膜层320的弹性模量大于2.5GPa。例如，透明叠层膜300的综合弹性模量大于5.5GPa，且透明叠层膜300的综合透过率大于85％，例如透明叠层膜300的综合透过率还可以进一步为大于90％，进而可以使贴附了该透明叠层膜300的显示面板达到更好的画面显示效果。
需要说明的是，第一膜层310和第二膜层320的弹性模量以及透过率可以相同，也可以不同。例如，在第一膜层310和第二膜层320的弹性模量相同的情形下，中心膜层330两侧受到相同的应力，进而可以使透明叠层膜300的翘曲度得到更好地改善，更好地保证透明叠层膜300表面的平整性。例如，在透明叠层膜300与显示器件贴合时，远离显示器件的第一膜层310/第二膜层320的弹性模量可以较小于第二膜层320/第一膜层310的弹性模量。
例如，中心膜层330的厚度为50-80μm，第一膜层310和/或第二膜层320的厚度为5-10μm，进而使透明叠层膜300的整体厚度可以为60-100μm。而图2中所示的双层透明窗膜200的厚度往往在160-200μm之间。因此，相比于双层透明窗膜200，本公开一些实施例的透明叠层膜300更加轻薄，同时可以达到更高的综合透过率。例如，第一膜层310和第二膜层320的厚度可以相同，也可以不同，这可以根据第一膜层310和第二膜层320各自接触的 界面、位于叠层结构中的位置等因素而定。
例如，第一膜层310、第二膜层320和中心膜层330的吸湿率均小于1.0，例如可以为0.5～0.9，且透明叠层膜300的综合吸湿率小于1.0，从而使透明叠层膜300的各项性能例如耐刮擦、耐压、易拉伸收缩等可以得到提高。
例如，中心膜层330的玻璃化转化温度大于400℃，且第一膜层310和/或第二膜层320的玻璃化转化温度为220～260℃，从而可以使第一膜层310、中心膜层330和第二膜层320可以通过热压的方式进行制备，省去了制备图1中所示的单层透明窗膜100所需的大应力，或者图2中所示的双层透明窗膜200的胶黏结构，使膜层的加工工艺得到简化，大大提升了制备的成功率。
例如，包括第一膜层310、中心膜层330和第二膜层320的透明叠层膜300可以通过将用于上述膜层310、320和330的原材料层直接层叠，然后将叠层热压得到，对此下文将具体说明。
图4为本公开一些实施例提供的另一种透明叠层膜400的层结构示意图。如图4所示，除了还进一步包括保护层340外，该实施例的透明叠层膜400与图3中所示的透明叠层膜300基本相同。在该实施例中，保护层340层叠在第一膜层310远离中心膜层330的一侧，且保护层340的硬度大于第一膜层310或第二膜层320的硬度。保护层340可以为无机涂层，例如可以采用氧化铝、氧化硅、类金刚石或其他适合的材料，并通过例如化学气相沉积、物理气相沉积(例如溅射)、等离子喷涂等方式进行制备。保护层340可以使透明叠层膜400的平整性以及耐刮擦性能得到进一步提高，进而对包括透明叠层膜400的显示装置起到更好的保护作用。
例如，保护层340的厚度可以为5-10μm，从而保证透明叠层膜400的整体厚度较小，使透明叠层膜400的综合透过率不会受到影响。
需要说明的是，在图4所示的实施例中，保护层340层叠在第一膜层310远离中心膜层330的一侧，而在本公开的其他一些实施例中，保护层340还可以层叠在第二膜层320远离中心膜层330的一侧。当透明叠层膜400与显示面板贴合时，层叠的保护层340在透明叠层膜400远离显示面板的一侧。
本公开至少一个实施例还提供一种本公开任一实施例所述的透明叠层膜的制造方法，包括：将所述第一膜层和所述第二膜层分别热压层叠至所述中心膜层的两侧。利用该制造方法可以省去制备单层透明热固性PI膜层所需的 大应力，或者双层透明热固性PI膜层的胶黏结构，使膜层的加工工艺得到简化，从而大大提升了制备的成功率。
图5为本公开一些实施例提供的一种透明叠层膜的制造方法的流程示意图。利用该透明叠层膜的制造方法可以制造本公开任一实施例所述的透明叠层膜300或透明叠层膜400。
例如，如图5所示，在一些实施例中，透明叠层膜300的制造方法包括步骤S10：将第一膜层310和第二膜层320分别热压层叠至中心膜层330的两侧。
例如，如图5所示，在一些实施例中，透明叠层膜400的制造方法还包括步骤S20：在第一膜层310(或第二膜层320)远离中心膜层330的一侧镀覆保护层340。
例如，在步骤S10中，该热压包括压辊热压或层板热压。
图6为本公开一些实施例提供的一种透明叠层膜300的热压方法的具体示例的示意图。如图6所示，第一膜层310和第二膜层320可以通过第一层板410和第二层板420分别热压层叠至中心膜层330的两侧。在热压过程中，例如可以采用单向加压方法或双向加压方法；在单向加压方法中，例如第二层板420放置在静止的基座上，在图6所示的情形中，压力从上至下施加在第一层板410上；在双向加压方法中，在图6所示的情形中，第一压力从上至下施加在第一层板410上，第二压力从下至上施加在第二层板420上。在一些实施例中，第一膜层310和第二膜层320采用热塑性聚酰亚胺，中心膜层330采用热固性聚酰亚胺。在上述方式中，例如第一层板410和第二层板420不但用于施加压力，还可以具有加热功能(例如通过电阻加热或通过热的气体或热的油加热)；或者，可以单独提供加热装置。例如，在一些实施例中，在对厚度为5-10μm的第一膜层310和第二膜层320进行热压加工时，该热压层叠的温度为300～350℃，压力为0.8～1.0牛顿，持续时间为10～30秒。例如，采用热固性PI的中心膜层330的玻璃化转化温度大于400℃，且采用热塑性PI的第一膜层310和/或第二膜层320的玻璃化转化温度为220～260℃，因此，该热压方法选用的300～350℃的热压层叠温度在两者之间，从而可以保证该热压工艺的实现，使本公开实施例提供的该透明叠层膜300的制造方法可以应用到实际生产中。
图7为本公开一些实施例提供的另一种透明叠层膜300的热压方法的具体示例的示意图。如图7所示，第一膜层310和第二膜层320可以通过第一压辊510和第二压辊520分别热压层叠至中心膜层330的两侧；并且，在热压过程中，同样可以采用单向加压方法或双向加压方法。在一些实施例中，第一膜层310和第二膜层320采用热塑性聚酰亚胺，中心膜层330采用热固性聚酰亚胺。在上述方式中，例如第一压辊510和第二压辊520不但用于施加压力，还可以具有加热功能(例如通过电阻加热或通过热的气体或热的油加热)；或者，可以单独提供加热装置。例如，在一些实施例中，在对厚度为5-10μm的第一膜层310和第二膜层320进行热压加工时，该热压层叠的温度也可以为300～350℃，压力也可以为0.8～1.0牛顿，持续时间也可以为10～30秒。
本公开至少一个实施例还提供一种显示装置，包括显示面板和覆盖在该显示面板的显示侧的本公开任一实施例所述的透明叠层膜，例如图3所示的实施例的透明叠层膜300，或图4所示的实施例的透明叠层膜400。该显示装置中的透明叠层膜由于避免了膜材本身存在的翘曲问题，可以改善显示装置的表面的平整性。在本公开的一些实施例中，该显示装置中的透明叠层膜还可以使显示装置满足耐压及耐刮擦的性能需求；在本公开的一些实施例中，该显示装置中的透明叠层膜还可以使显示装置实现良好的弯折效果及回覆性能。
图8A和图8B为本公开一些实施例提供的一种显示装置10的结构示意图。如图8A所示，该显示装置10包括显示面板600和覆盖在显示面板600的显示侧的如图3所示的透明叠层膜300；或如图8B所示，该显示装置10包括显示面板600和覆盖在显示面板600的显示侧的如图4所示的透明叠层膜400。
例如，如图8A所示，当透明叠层膜300与显示面板600贴合时，显示面板600可以与透明叠层膜300的第二膜层320接触。在本公开的其他一些实施例中，显示面板600也可以与透明叠层膜300的第一膜层310接触，本公开实施例对此不作限制。
例如，如图8B所示，当透明叠层膜400与显示面板600贴合时，保护层340在透明叠层膜400远离显示面板600的一侧，显示面板600与透明叠 层膜400的第二膜层320接触。在本公开的其他一些实施例中，在保护层340层叠在第二膜层320远离中心膜层330的一侧的情形，显示面板600与透明叠层膜400的第一膜层310接触。
例如，在图8A和图8B所示的实施例中，显示面板600可以为柔性有机发光二极管(OLED)显示面板、量子点发光二极管(PLED)显示面板、液晶显示面板、电子纸显示面板等。
需要说明的是，本公开的一些实施例中，显示装置10还可以包括更多的部件和结构，这些部件和结构均为本领域的普通技术人员应该理解具有的，在此不做赘述，也不应作为对本公开实施例的限制。
例如，本公开一些实施例的显示装置还可以包括偏光片和触控结构层等，下面以图3所示的透明叠层膜300为例进行说明。
图9为本公开一些实施例提供的另一种显示装置20的结构示意图。如图9所示，除了包括显示面板600和透明叠层膜300外，该显示装置20还可以包括偏光片610和触控结构层620，偏光片610和触控结构层620层叠设置在显示面板600与透明叠层膜300之间。偏光片610夹置在显示面板600与触控结构层620之间，触控结构层620夹置在偏光片610与透明叠层膜300之间，并且可以通过例如光学胶将显示面板600、偏光片610、触控结构层620和透明叠层膜300等多个部件粘结为一体。
例如，偏光片610为圆偏光片，该圆偏光片包括层叠的线性偏光层以及四分之一波片，线性偏光层位于显示侧，该四分之一波片的轴与线性偏光层的偏光轴成45度角，因此当外部光穿过该圆偏光片之后被转换为圆偏光，该圆偏光被显示面板600中的电极反射回之后，第二次穿过四分之一波片时又被转换为线偏光，但是该线偏光的偏振方向与线性偏光层的偏光轴相差90度，而不能穿过该线性偏光层。因此，该偏光片610可以吸收射向显示装置20的外部光，从而降低外界环境光的干扰，提高显示装置20的显示图像的对比度。
例如，触控结构层620的类型可以包括电阻式、电容式、红外线式、声波式或者其它类型。例如，电容式触控单元可以包括自电容型、互电容型，例如包括多个触控单元。在外界物体(例如手指)靠近的情况下，电容式触控单元的电容值会发生变化，如此，可以对显示装置20的被触摸位置进行检 测。本公开的实施例对于触控结构层620的类型以及具体结构不作限制，例如，显示面板600本身可以具有内置式触控结构(即In-cell型触控结构)。
例如，该显示装置20还可以包括衬底基板630，该衬底基板630设置在显示面板600远离透明叠层膜300的一侧。该衬底基板630可以为玻璃基板、塑料基板或其他柔性基板等。
例如，显示装置10和显示装置20可以为液晶面板、电子纸、OLED面板、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件，本公开的实施例对此不作限制。
有以下几点需要说明：
(1)本公开实施例附图只涉及到与本公开实施例涉及到的结构，其他结构可参考通常设计。
(2)为了清晰起见，在用于描述本公开的实施例的附图中，层或区域的厚度被放大或缩小，即这些附图并非按照实际的比例绘制。可以理解，当诸如层、膜、区域或基板之类的元件被称作位于另一元件“上”或“下”时，则该元件可以“直接”位于另一元件“上”或“下”，或者可以存在中间元件。
(3)在不冲突的情况下，本公开的实施例及实施例中的特征可以相互组合以得到新的实施例。
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权利要求的保护范围为准。

Claims (21)

  1. 一种用于覆盖在显示面板的显示侧的透明叠层膜，包括依次层叠的第一膜层、中心膜层和第二膜层，
    其中，所述第一膜层和所述第二膜层为热塑性塑料，所述中心膜层为热固性塑料。
  2. 根据权利要求1所述的透明叠层膜，其中，所述热塑性塑料为热塑性聚酰亚胺，所述热固性塑料为热固性聚酰亚胺。
  3. 根据权利要求1或2所述的透明叠层膜，其中，所述中心膜层的透过率大于所述第一膜层和所述第二膜层的透过率。
  4. 根据权利要求1-3任一所述的透明叠层膜，其中，所述中心膜层的弹性模量大于所述第一膜层的弹性模量和所述第二膜层的弹性模量。
  5. 根据权利要求1-4任一所述的透明叠层膜，其中，所述中心膜层的透过率大于90％，且所述中心膜层的弹性模量大于6GPa。
  6. 根据权利要求1-5任一所述的透明叠层膜，其中，所述第一膜层和所述第二膜层中至少之一的透过率大于70％，所述第一膜层和所述第二膜层中至少之一的弹性模量大于2.5GPa。
  7. 根据权利要求1-6任一所述的透明叠层膜，其中，所述透明叠层膜的综合透过率大于85％，且所述透明叠层膜的综合弹性模量大于5.5GPa。
  8. 根据权利要求1-7任一所述的透明叠层膜，其中，所述中心膜层的厚度为50-80μm，所述第一膜层和所述第二膜层中至少之一的厚度为5-10μm。
  9. 根据权利要求1-8任一所述的透明叠层膜，其中，所述第一膜层、所述第二膜层和所述中心膜层的吸湿率小于1.0，且所述透明叠层膜的综合吸湿率小于1.0。
  10. 根据权利要求1-9任一所述的透明叠层膜，其中，所述中心膜层的玻璃化转化温度大于400℃，且所述第一膜层和所述第二膜层中至少之一的玻璃化转化温度为220～260℃。
  11. 根据权利要求1-10任一所述的透明叠层膜，其中，所述第一膜层、所述中心膜层和所述第二膜层通过热压直接层叠得到。
  12. 根据权利要求1-11任一所述的透明叠层膜，还包括保护层，其中， 所述保护层层叠在所述第一膜层或所述第二膜层远离所述中心膜层的一侧，且所述保护层的硬度大于所述第一膜层或所述第二膜层的硬度。
  13. 根据权利要求12所述的透明叠层膜，其中，所述保护层的厚度为5-10μm。
  14. 一种显示装置，包括显示面板和覆盖在所述显示面板的显示侧的如权利要求1-13任一所述的透明叠层膜。
  15. 根据权利要求14所述的显示装置，其中，所述显示面板为柔性有机发光二极管显示面板。
  16. 根据权利要求14或15所述的显示装置，还包括偏光片和触控结构层，
    其中，所述偏光片和所述触控结构层层叠设置在所述显示面板与所述透明叠层膜之间。
  17. 根据权利要求14或15所述的显示装置，其中，所述透明叠层膜还包括保护层，
    所述保护层层叠在所述透明叠层膜远离所述显示面板的一侧，且所述保护层的硬度大于所述第一膜层或所述第二膜层的硬度。
  18. 一种如权利要求1-13任一所述的透明叠层膜的制造方法，包括：
    将所述第一膜层和所述第二膜层分别热压层叠至所述中心膜层的两侧。
  19. 根据权利要求18所述的制造方法，其中，所述热压包括压辊热压或层板热压。
  20. 根据权利要求18所述的制造方法，其中，所述热压的温度为300～350℃，压力为0.8～1.0牛顿，持续时间为10～30秒。
  21. 根据权利要求18所述的制造方法，还包括：在所述第一膜层或所述第二膜层远离所述中心膜层的一侧形成保护层，
    其中，所述保护层的硬度大于所述第一膜层或所述第二膜层的硬度。
PCT/CN2019/070244 2019-01-03 2019-01-03 透明叠层膜、显示装置及透明叠层膜的制造方法 WO2020140233A1 (zh)

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