WO2020113840A1 - 保护盖板以及柔性显示装置 - Google Patents

保护盖板以及柔性显示装置 Download PDF

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Publication number
WO2020113840A1
WO2020113840A1 PCT/CN2019/078211 CN2019078211W WO2020113840A1 WO 2020113840 A1 WO2020113840 A1 WO 2020113840A1 CN 2019078211 W CN2019078211 W CN 2019078211W WO 2020113840 A1 WO2020113840 A1 WO 2020113840A1
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Prior art keywords
material layer
curved portion
thickness
modulus
young
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PCT/CN2019/078211
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English (en)
French (fr)
Inventor
陈宝
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Publication of WO2020113840A1 publication Critical patent/WO2020113840A1/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
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • 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

Definitions

  • the present application relates to the field of display, in particular to a protective cover and a flexible display device.
  • OLED display technology is gradually popularizing in the mobile phone and TV markets, and the yield rate has been greatly improved.
  • the status of its next-generation display technology has been unshakable, and OLED-based flexible display is an important research and development direction of future display technology.
  • the surface has a protective film called a cover window (Cover Window). Its purpose is to improve the hardness, scratch resistance of the OLED flexible screen, and to protect the internal film materials (such as Touch panel or polarizer, etc.).
  • the cover window is composed of two materials with different Young's modulus.
  • the existing protective cover sets the Young's modulus of the protection cover plate relatively low.
  • the hardness of the non-bent part of the protective cover is low, and it is difficult to pass the pressure test.
  • the existing protective cover has a technical problem that it is difficult for the non-bent portion to pass the pressure test.
  • the present application provides a protective cover and a flexible display device to solve the technical problem that the non-bent portion of the existing protective cover is difficult to pass the pressure test.
  • An embodiment of the present application provides a protective cover plate for a flexible display device, the flexible display device includes a bending area and a non-bending area, the protective cover plate includes a bending portion located in the bending area, and In the non-bent portion located in the non-bending area, the Young's modulus of the curved portion is smaller than the Young's modulus of the non-bent portion.
  • the protective cover plate of the present application includes a first material layer and a second material layer, the Young's modulus of the first material layer is smaller than the Young's modulus of the second material layer, so The total film thickness of the curved portion is equal to the total film thickness of the non-curved portion; the thickness of the second material layer of the curved portion is smaller than the thickness of the second material layer of the non-curved portion.
  • the thickness of the second material layer of the curved portion is the same, and the thickness of the second material layer of the non-curved portion is the same.
  • the thickness of the second material layer of the curved portion is the same, and the thickness of the second material layer of the non-curved portion gradually increases from the curved portion to the edge.
  • the thickness of the second material layer of the curved portion is different, and gradually increases from the first non-curved portion to the second non-curved portion.
  • the thickness of the second material layer of the curved portion is different, and decreases from the first non-curved portion to the second non-curved portion and then increases.
  • the thickness of the second material layer of the curved portion is different, and changes periodically from the first non-curved portion to the second non-curved portion.
  • the protective cover plate includes a first material layer, a second material layer, and a third material layer, and the first material layer is located on the second material layer and the third material layer
  • the Young's modulus of the first material layer is less than the Young's modulus of the second material layer
  • the Young's modulus of the first material layer is less than the Young's modulus of the third material layer
  • the total thickness of the film layer of the curved portion is equal to the total thickness of the film layer of the non-curved portion; the thickness of the second material layer of the curved portion is smaller than the thickness of the second material layer of the non-curved portion.
  • the thickness of the second material layer of the curved portion is the same, and the thickness of the second material layer of the non-curved portion is the same.
  • the thickness of the third material layer of the curved portion is smaller than the thickness of the third material layer of the non-curved portion.
  • the third material layer of the curved portion has the same thickness, and the third material layer of the non-curved portion has the same thickness.
  • the thickness of the second material layer of the bent portion is the same as the thickness of the third material layer of the bent portion.
  • the thickness of the second material layer of the non-curved portion is the same as the thickness of the third material layer of the non-curved portion.
  • the Young's modulus of the second material layer is the same as the Young's modulus of the third material layer.
  • An embodiment of the present application provides a flexible display device, which includes a flexible display panel and a protective cover plate for protecting the flexible display panel.
  • the flexible display device includes a bending area and a non-bending area, and the protection cover plate It includes a bending portion located in the bending area and a non-bending portion located in the non-bending area, and the Young's modulus of the bending portion is smaller than the Young's modulus of the non-bending portion.
  • the protective cover includes a first material layer and a second material layer, the Young's modulus of the first material layer is smaller than the Young's modulus of the second material layer, so The total film thickness of the curved portion is equal to the total film thickness of the non-curved portion; the thickness of the second material layer of the curved portion is smaller than the thickness of the second material layer of the non-curved portion.
  • the thickness of the second material layer of the curved portion is the same, and the thickness of the second material layer of the non-curved portion is the same.
  • the protective cover includes a first material layer, a second material layer, and a third material layer, and the first material layer is located on the second material layer and the third material layer
  • the Young's modulus of the first material layer is less than the Young's modulus of the second material layer
  • the Young's modulus of the first material layer is less than the Young's modulus of the third material layer
  • the total thickness of the film layer of the curved portion is equal to the total thickness of the film layer of the non-curved portion; the thickness of the second material layer of the curved portion is smaller than the thickness of the second material layer of the non-curved portion.
  • the thickness of the second material layer of the curved portion is the same, and the thickness of the second material layer of the non-curved portion is the same.
  • the thickness of the second material layer of the curved portion is the same as the thickness of the third material layer of the curved portion, and the thickness of the second material layer of the non-curved portion is the same as that of the non-curved portion
  • the third material layer has the same thickness.
  • the present application provides a new protective cover plate and a flexible display device.
  • the protective cover plate includes a curved portion located in the bending area and a non-bending portion located in the non-bending area.
  • the modulus is smaller than the Young's modulus of the non-bent part; in this way, because the bent part of the protective cover plate has a lower Young's modulus, it can pass the bendability test, while the non-bent part (generally corresponds to the display screen Area) has a high Young's modulus and can pass the pressure test, which solves the technical problem of the existing protective cover plate that the non-bent portion is difficult to pass the pressure test.
  • FIG. 1 is a first schematic cross-sectional view of a protective cover provided by an embodiment of the present application.
  • FIG. 2 is a second schematic cross-sectional view of a protective cover provided by an embodiment of the present application.
  • FIG. 3 is a third schematic cross-sectional view of a protective cover provided by an embodiment of the present application.
  • FIG. 4 is a fourth schematic cross-sectional view of a protective cover provided by an embodiment of the present application.
  • FIG. 5 is a fifth cross-sectional schematic diagram of a protective cover provided by an embodiment of the present application.
  • FIG. 6 is a sixth cross-sectional schematic diagram of a protective cover provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a display device provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of the film layer of the existing cover plate.
  • FIG. 9 is a schematic diagram of a film layer of a protective cover provided by an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a comparison between the force deformation of the existing cover plate and the protective cover plate provided by the embodiment of the present application.
  • FIG. 11 is a schematic diagram of stress during deformation of a protective cover provided by an embodiment of the present application.
  • the embodiments of the present application can solve this problem.
  • an embodiment of the present application provides a protective cover plate 1 for a flexible display device 2.
  • the flexible display device 2 includes a bending area SS and a non-bending area NS.
  • the protective cover plate 1 includes The bending portion 11 located in the bending area SS, and the non-bending portion 12 (including the first non-bending portion 12a and the second non-bending portion 12b in FIG. 1) located in the non-bending area NS, the The Young's modulus of the bent portion 11 is smaller than the Young's modulus of the non-bent portion 12.
  • the Young's modulus refers to the Young's modulus of the curved portion 11/non-curved portion 12, and the curved portion 11 / non-curved portion 12 exhibits different Young's modulus according to the film material or the thickness of the film layer. .
  • the present application provides a new protective cover plate including a curved portion located in the bending area and a non-bending portion located in the non-bending area, the Young's modulus of the curved portion is less than The Young's modulus of the non-bent part; thus, since the bent part of the protective cover plate has a lower Young's modulus, it can pass the bendability test, while the non-bent part (generally corresponding to the display screen area) has a higher The high Young's modulus can pass the pressure test, which solves the technical problem that the non-bent part of the existing protective cover is difficult to pass the pressure test.
  • the manner in which the Young's modulus of the curved portion 11 is smaller than the Young's modulus of the non-curved portion 12 may be achieved by selecting a suitable material, for example, the curved portion 11 and the non-curved portion 12 use different Young's modulus Material, so that the Young's modulus of the curved portion 11 is smaller than the Young's modulus of the non-curved portion 12, or it can be achieved by using different film thicknesses.
  • the biggest difference between the flexible AMOLED display and the general flat display in the module structure is that the glass cover (Cover) cannot be used like the general flat display Glass), because the bendability of glass is low, the bending process is fragile.
  • the cover materials used in flexible AMOLED displays today are all plastic materials CPI.
  • display products require the surface to be resistant to scratches and impacts, and plastic materials are inherently not as hard as glass. Therefore, general commercial plastic covers will be coated with a hard layer of anti-scratch material (HC, Hard Coating).
  • the plastic cover includes a substrate and a reinforced coating.
  • the substrate is generally made of transparent polyimide (CPI), and the reinforced coating can be used for single-side coating (Single-side HC) and double-side coating (Double-side coating) HC).
  • the protective cover plate 1 includes a first material layer S1 and a second material layer S2, and the first material layer S1 has a Young's modulus less than the second material layer S2 Young's modulus of the film, the total thickness H1 of the film portion of the curved portion 11 is equal to the total film thickness H2 of the non-curved portion 12; the thickness h21 of the second material layer S2 of the curved portion is smaller than that of the non-curved portion The second material layer S2 has a thickness h22.
  • the first material layer S1 generally uses transparent polyimide (CPI), and the second material layer S2 uses a hard scratch-resistant material (HC, Hard Coating).
  • CPI transparent polyimide
  • HC hard scratch-resistant material
  • the thickness h21 of the second material layer S2 of the curved portion 11 is the same, and the thickness h22 of the second material layer S2 of the non-curved portion 12 is the same. That is, in the curved portion 11 and the non-curved portion 12, the second material layer S2 is uniformly arranged, and the arrangement is simple in this way.
  • the thickness h21 of the second material layer S2 of the curved portion 11 is the same, and the thickness h22 of the second material layer S2 of the non-curved portion 12 gradually increases from the curved portion 11 to the edge.
  • the thickness h21 of the second material layer S2 of the curved portion 11 is different, and gradually increases from the first non-curved portion to the second non-curved portion.
  • the thickness h21 of the second material layer S2 of the curved portion 11 is different, and decreases from the first non-curved portion to the second non-curved portion and then increases.
  • the thickness h21 of the second material layer S2 of the curved portion 11 is different, and changes periodically from the first non-curved portion to the second non-curved portion.
  • the protective cover 1 includes a first material layer S1, a second material layer S2, and a third material layer S3, and the first material layer S1 is located in the second Between the material layer S2 and the third material layer S3, the Young's modulus of the first material layer S1 is smaller than the Young's modulus of the second material layer S2, and the Young's modulus of the first material layer S1 The modulus is smaller than the Young's modulus of the third material layer S3, and the total thickness H1 of the film layer of the curved portion 11 is equal to the total thickness H2 of the film layer of the non-curved portion 12; the first material of the curved portion 11 The thickness h11 of the layer S1 is greater than the thickness h12 of the first material layer S1 of the non-bent portion 12.
  • the first material layer S1 generally uses transparent polyimide (CPI), and the second material layer S2 and the third material layer S3 use hard scratch resistant materials (HC, Hard Coating).
  • CPI transparent polyimide
  • HC hard scratch resistant materials
  • the thickness h21 of the second material layer S2 of the curved portion 11 is smaller than the thickness h22 of the second material layer S2 of the non-curved portion 12.
  • the thickness h21 of the second material layer S2 of the curved portion 11 is the same, and the thickness h22 of the second material layer S2 of the non-curved portion 12 is the same.
  • the thickness h31 of the third material layer S3 of the curved portion 11 is smaller than the thickness h32 of the third material layer S3 of the non-curved portion 12.
  • the thickness h31 of the third material layer S3 of the curved portion 11 is the same, and the thickness h32 of the third material layer S3 of the non-curved portion 12 is the same.
  • the thickness h21 of the second material layer S2 of the curved portion 11 is the same as the thickness h31 of the third material layer S3 of the curved portion 11.
  • the thickness h22 of the second material layer S2 of the non-curved portion 12 is the same as the thickness h31 of the third material layer S3 of the curved portion 11.
  • the Young's modulus of the second material layer S2 is the same as the Young's modulus of the third material layer S3, for example, formed by using the same material.
  • an embodiment of the present application provides a protective cover plate 1 for a flexible display device 2.
  • the flexible display device 2 includes a bending area SS and a non-bending area NS.
  • the protective cover plate 1 includes The bending portion 11 located in the bending area SS, the non-bending portion 12 located in the non-bending area NS (the non-bending portion 12a and the non-bending portion 12b in FIG. 4), and the bending portion 11 and In the transition portion 14 between the non-curved portion 12 (the non-curved portion 13a and the non-curved portion 13b in FIG.
  • the Young's modulus of the curved portion 11 is smaller than the Young's modulus of the non-curved portion 12
  • the Young's modulus of the transition portion 13 is larger than the Young's modulus of the curved portion 11 and smaller than the Young's modulus of the non-bent portion 12.
  • the transition portion 13 is located in the bending zone SS.
  • the different Young's modulus of different parts can be achieved by choosing a suitable material, for example, the bending part 11, the non-bending part 12 and the transition part 13 are made of different Young's modulus materials, so that different parts can be partially realized Different Young's modulus can also be achieved by using different film thicknesses.
  • the protective cover plate 1 includes a first material layer S1 and a second material layer S2, and the first material layer S1 has a Young's modulus less than the second material layer S2
  • the Young's modulus of the film, the total thickness H1 of the curved portion 11, the total thickness H2 of the non-curved portion 12, and the total thickness H3 of the transition portion 13 are the same; the second portion of the curved portion 11
  • the thickness h21 of the material layer is smaller than the thickness h23 (average thickness) of the second material layer of the transition portion 13, and the thickness h23 of the second material layer of the transition portion 13 is smaller than the thickness h22 of the second material layer of the non-curved portion 13.
  • the thickness h21 of the second material layer S2 of the curved portion 11 is the same
  • the thickness h22 of the second material layer S2 of the non-curved portion 12 is the same
  • the thickness of the transition portion 13 The thickness h22 of the second material layer S2 gradually increases from the curved portion 11 to the non-curved portion 12. That is, in the curved portion 11 and the non-curved portion 12, the second material layer S2 is uniformly arranged, and the arrangement is simple in this way.
  • the cross section of the contact surface m between the second material layer S2 and the first material layer S1 of the transition portion 13 is a straight line.
  • the cross-section of the contact surface m between the second material layer S2 and the first material layer S1 of the transition portion 13 is a curve or an arc, or a combination lamp mode of a curve and a straight line.
  • the protective cover 1 includes a first material layer S1, a second material layer S2, and a third material layer S3, and the first material layer S1 is located in the second Between the material layer S2 and the third material layer S3, the Young's modulus of the first material layer S1 is smaller than the Young's modulus of the second material layer S2, and the Young's modulus of the first material layer S1 The modulus is smaller than the Young's modulus of the third material layer S3, the total film thickness H1 of the curved portion 11, the total film thickness H2 of the non-curved portion 12, and the total film thickness H3 of the transition portion 13.
  • the thickness h11 of the first material layer S1 of the curved portion 11 is greater than the thickness h13 (average thickness value) of the first material layer of the transition portion 13
  • the thickness h13 of the first material layer of the transition portion 13 is greater than the non- The thickness h12 of the first material layer S1 of the bent portion 12.
  • the thickness h21 of the second material layer S2 of the curved portion 11 is smaller than the thickness h23 of the second material layer of the transition portion 13, and the second material layer of the transition portion 13
  • the thickness h23 is smaller than the thickness h22 of the second material layer S2 of the non-bent portion 12.
  • the thickness h21 of the second material layer S2 of the curved portion 11 is the same
  • the thickness h22 of the second material layer S2 of the non-curved portion 12 is the same
  • the thickness of the transition portion 13 The thickness h22 of the second material layer gradually increases from the curved portion 11 to the non-curved portion 12.
  • the thickness h31 of the third material layer S3 of the curved portion 11 is smaller than the thickness h33 of the third material layer S3 of the transition portion 13, and the third material of the transition portion 13
  • the thickness h33 of the layer S3 is smaller than the thickness h32 of the third material layer S3 of the non-bent portion 12.
  • the thickness h31 of the third material layer S3 of the curved portion 11 is the same, and the thickness h32 of the third material layer S3 of the non-curved portion 12 is the same.
  • the thickness h21 of the second material layer S2 of the curved portion 11 is the same as the thickness h31 of the third material layer S3 of the curved portion 11.
  • the thickness h22 of the second material layer S2 of the non-curved portion 12 is the same as the thickness h31 of the third material layer S3 of the curved portion 11.
  • the Young's modulus of the second material layer S2 is the same as the Young's modulus of the third material layer S3, for example, formed by using the same material.
  • the cross section of the contact surface m1 of the second material layer S2 and the first material layer S1 of the transition portion 13 is a straight line.
  • the cross-section of the contact surface m1 of the second material layer S2 and the first material layer S1 of the transition portion 13 is a curve or a circular arc, or a combined lamp mode of a curve and a straight line.
  • the cross section of the contact surface m2 between the third material layer S3 of the transition portion 13 and the first material layer S1 is a straight line.
  • the cross-section of the contact surface m2 between the third material layer S3 and the first material layer S1 of the transition portion 13 is a curve or a circular arc, or a combined lamp mode of a curve and a straight line.
  • the present application also provides a flexible display device, which includes a flexible display panel and a protective cover for protecting the flexible display panel, the flexible display device includes a bending area and a non-bending A folding area, the protective cover plate includes a bending portion located in the bending area, and a non-bending portion located in the non-bending area, and the Young's modulus of the bending portion is smaller than that of the non-bending portion Moduli.
  • the curved part of the protective cover has a low Young's modulus, it can pass the bendability test, while the non-bent part (generally corresponding to the display screen area) has a high Young's modulus, which can pass the pressure test It solves the technical problem that the non-bent part of the existing protective cover is difficult to pass the pressure test.
  • the protective cover includes a first material layer and a second material layer, the first material layer has a Young's modulus less than the second material layer, the bending The total film thickness of the portion is equal to the total film thickness of the non-curved portion; the thickness of the second material layer of the curved portion is less than the thickness of the second material layer of the non-curved portion.
  • the thickness of the second material layer of the curved portion is the same, and the thickness of the second material layer of the non-curved portion is the same.
  • the protective cover includes a first material layer, a second material layer, and a third material layer, the first material layer is located between the second material layer and the third material layer ,
  • the Young's modulus of the first material layer is less than the Young's modulus of the second material layer, the Young's modulus of the first material layer is less than the Young's modulus of the third material layer, so
  • the total film thickness of the curved portion is equal to the total film thickness of the non-curved portion; the thickness of the second material layer of the curved portion is smaller than the thickness of the second material layer of the non-curved portion.
  • the thickness of the second material layer of the curved portion is the same, and the thickness of the second material layer of the non-curved portion is the same.
  • the thickness of the third material layer of the curved portion is smaller than the thickness of the third material layer of the non-curved portion.
  • the third material layer of the curved portion has the same thickness, and the third material layer of the non-curved portion has the same thickness.
  • the thickness of the second material layer of the curved portion is the same as the thickness of the third material layer of the curved portion, and the thickness of the second material layer of the non-curved portion is the same as the third thickness of the non-curved portion
  • the thickness of the material layer is the same.
  • the Young's modulus of the second material layer is the same as the Young's modulus of the third material layer.
  • Flexible display screens have many advantages such as lightness, thinness, and portability, and are important development directions for OLED display technology.
  • the Cover Window of the OLED screen must ensure sufficient hardness and good bending resistance.
  • the existing plastic cover window structure 80 includes: a uniform thickness Harding Coating film layer 81 in the upper part, and a uniform thickness CPI film layer 82 in the lower part.
  • the Hard Coating thickness with high Young's modulus is increased in the non-bending area of the OLED screen, and the CPI thickness with low Young's modulus is increased in the bending area, so that the Cover Window and the Panel Hardness, at the same time, reduces the stress of the Panel during bending in the bending area, ensuring good bending resistance, thereby increasing the number of bending times during use.
  • the design of the cover window device in the bending area and the non-bending area of the OLED screen with different thicknesses can improve the display effect of the flexible screen, enhance the user experience of the flexible display, and finally reach the mass production index of the flexible screen.
  • the flexible display industry brings high economic benefits.
  • This embodiment provides a Cover Window structure that can both increase the rigidity of the flexible OLED screen and take into account the bendability of the flexible OLED screen.
  • the window structure is composed of two layers of film materials, Hard Coating and CPI.
  • the thickness of the Hard Coating in the non-bending area is higher than the thickness of the non-bending area; the thickness of the CPI in the bending area is higher than the thickness of the bending area.
  • the new Cover Window structure 90 provided in this embodiment for taking into account the rigidity and bendability of the flexible OLED display screen is composed as follows: a non-uniform thickness Harding Coating film layer 91 on the upper part and a non-uniform thickness on the lower door CPI film layer 92 of uniform thickness.
  • FIG. 10 illustrates the comparison between the deformation of the existing Cover Window structure and the flexible screen of the new Cover Window structure proposed in this embodiment during the pencil hardness test in the non-bending area.
  • the deformation of the existing cover plate shown as a in FIG. 10
  • the deformation of the plastic cover plate shown as b in FIG.
  • the Cover Window device with a thickened CPI structure in the bending area is weak, and the stress during bending is small, which not only improves the hardness of the non-bending area, but also takes into account the bending Bending resistance of the zone.
  • the present application provides a new protective cover plate and a flexible display device.
  • the protective cover plate includes a curved portion located in the bending area and a non-bending portion located in the non-bending area.
  • the modulus is smaller than the Young's modulus of the non-bent part; in this way, because the bent part of the protective cover plate has a lower Young's modulus, it can pass the bendability test, while the non-bent part (generally corresponds to the display screen Area) has a high Young's modulus and can pass the pressure test, which solves the technical problem of the existing protective cover plate that the non-bent portion is difficult to pass the pressure test.

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Abstract

一种用于柔性显示装置（2）的保护盖板（1），包括弯曲部（11）以及非弯曲部（12），弯曲部（11）的杨氏模量小于非弯曲部（12）的杨氏模量。这样由于保护盖板（1）的弯曲部（11）具有较低的杨氏模量可以通过弯折性测试，同时非弯折部（12）具有较高的杨氏模量可以通过压力测试，解决了现有保护盖板存在的非弯折部难以通过压力测试的技术问题。

Description

保护盖板以及柔性显示装置 技术领域
本申请涉及显示领域，尤其涉及一种保护盖板以及柔性显示装置。
 背景技术
近年来，OLED显示技术正在手机与电视市场逐步普及,良品率有了大幅提升,其下一代显示技术的地位已无可撼动，而基于OLED的柔性显示则是未来显示技术的一个重要研发方向。
柔性屏幕无论是内弯还是外弯，其表面都有一层称之为保护盖板（Cover Window）的保护膜，其目的是提升OLED柔性屏的硬度、耐刮性和保护内部的膜材（如触控面板或者偏光片等）。
保护盖板（Cover Window）由两种杨氏模量不同的材料组成，现有保护盖板为了通过弯折部的弯折性测试，会将保护盖板的杨氏模量设置的比较低，但会导致保护盖板非弯折部的硬度低，难以通过压力测试。
即现有保护盖板存在非弯折部难以通过压力测试的技术问题。
 技术问题
本申请提供一种保护盖板以及柔性显示装置，以解决现有保护盖板存在的非弯折部难以通过压力测试的技术问题。
 技术解决方案
为解决上述问题，本申请提供的技术方案如下：
本申请实施例提供一种用于柔性显示装置的保护盖板，所述柔性显示装置包括弯折区和非弯折区，所述保护盖板包括位于所述弯折区内的弯曲部、以及位于所述非弯折区的非弯曲部，所述弯曲部的杨氏模量小于所述非弯曲部的杨氏模量。
在本申请的保护盖板中，所述保护盖板包括第一材料层以及第二材料层，所述第一材料层的杨氏模量小于所述第二材料层的杨氏模量，所述弯曲部的膜层总厚度等于所述非弯曲部的膜层总厚度；所述弯曲部的第二材料层厚度小于所述非弯曲部的第二材料层厚度。
在本申请的保护盖板中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度相同。
在本申请的保护盖板中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度从弯曲部到边缘逐渐增大。
在本申请的保护盖板中，所述弯曲部的第二材料层厚度不同，从第一非弯曲部到第二非弯曲部逐渐增大。
在本申请的保护盖板中，所述弯曲部的第二材料层厚度不同，从第一非弯曲部到第二非弯曲部先减小后增大。
在本申请的保护盖板中，所述弯曲部的第二材料层厚度不同，从第一非弯曲部到第二非弯曲部周期性变化。
在本申请的保护盖板中，所述保护盖板包括第一材料层、第二材料层以及第三材料层，所述第一材料层位于所述第二材料层及所述第三材料层之间，所述第一材料层的杨氏模量小于所述第二材料层的杨氏模量，所述第一材料层的杨氏模量小于所述第三材料层的杨氏模量，所述弯曲部的膜层总厚度等于所述非弯曲部的膜层总厚度；所述弯曲部的第二材料层厚度小于所述非弯曲部的第二材料层厚度。
在本申请的保护盖板中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度相同。
在本申请的保护盖板中，所述弯曲部的第三材料层厚度小于所述非弯曲部的第三材料层厚度。
在本申请的保护盖板中，所述弯曲部的第三材料层厚度相同，所述非弯曲部的第三材料层厚度相同。
在本申请的保护盖板中，所述弯曲部的第二材料层厚度与所述弯曲部的第三材料层厚度相同。
在本申请的保护盖板中，所述非弯曲部的第二材料层厚度与所述非弯曲部的第三材料层厚度相同。
在本申请的保护盖板中，所述第二材料层的杨氏模量与所述第三材料层的杨氏模量相同。
本申请实施例提供一种柔性显示装置，其包括柔性显示面板以及用于保护所述柔性显示面板的保护盖板，所述柔性显示装置包括弯折区和非弯折区，所述保护盖板包括位于所述弯折区内的弯曲部、以及位于所述非弯折区的非弯曲部，所述弯曲部的杨氏模量小于所述非弯曲部的杨氏模量。
在本申请的柔性显示装置中，所述保护盖板包括第一材料层以及第二材料层，所述第一材料层的杨氏模量小于所述第二材料层的杨氏模量，所述弯曲部的膜层总厚度等于所述非弯曲部的膜层总厚度；所述弯曲部的第二材料层厚度小于所述非弯曲部的第二材料层厚度。
在本申请的柔性显示装置中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度相同。
在本申请的柔性显示装置中，所述保护盖板包括第一材料层、第二材料层以及第三材料层，所述第一材料层位于所述第二材料层及所述第三材料层之间，所述第一材料层的杨氏模量小于所述第二材料层的杨氏模量，所述第一材料层的杨氏模量小于所述第三材料层的杨氏模量，所述弯曲部的膜层总厚度等于所述非弯曲部的膜层总厚度；所述弯曲部的第二材料层厚度小于所述非弯曲部的第二材料层厚度。
在本申请的柔性显示装置中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度相同。
在本申请的柔性显示装置中，所述弯曲部的第二材料层厚度与所述弯曲部的第三材料层厚度相同，所述非弯曲部的第二材料层厚度与所述非弯曲部的第三材料层厚度相同。
 有益效果
本申请提供一种新的保护盖板以及柔性显示装置，该保护盖板包括位于所述弯折区内的弯曲部、以及位于所述非弯折区的非弯曲部，所述弯曲部的杨氏模量小于所述非弯曲部的杨氏模量；这样，由于保护盖板的弯曲部具有较低的杨氏模量，可以通过弯折性测试，同时非弯折部（一般对应显示屏幕区域）具有较高的杨氏模量，可以通过压力测试，解决了现有保护盖板存在的非弯折部难以通过压力测试的技术问题。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，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为本申请实施例提供的保护盖板的第一种截面示意图。
图2为本申请实施例提供的保护盖板的第二种截面示意图。
图3为本申请实施例提供的保护盖板的第三种截面示意图。
图4为本申请实施例提供的保护盖板的第四种截面示意图。
图5为本申请实施例提供的保护盖板的第五种截面示意图。
图6为本申请实施例提供的保护盖板的第六种截面示意图。
图7为本申请实施例提供的显示装置的示意图。
图8为现有盖板的膜层示意图。
图9为本申请实施例提供的保护盖板的膜层示意图。
图10为现有盖板与本申请实施例提供的保护盖板的受力形变对比示意图。
图11为本申请实施例提供的保护盖板形变时应力示意图。
 本发明的实施方式
以下各实施例的说明是参考附加的图示，用以例示本申请可用以实施的特定实施例。本申请所提到的方向用语，例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本申请，而非用以限制本申请。在图中，结构相似的单元是用以相同标号表示。
针对现有保护盖板存在的非弯折部难以通过压力测试的技术问题，本申请实施例可以解决这个问题。
如图1所示，本申请实施例提供一种用于柔性显示装置2的保护盖板1，所述柔性显示装置2包括弯折区SS和非弯折区NS，所述保护盖板1包括位于所述弯折区SS内的弯曲部11、以及位于所述非弯折区NS的非弯曲部12（包括图1中的第一非弯曲部12a以及第二非弯曲部12b），所述弯曲部11的杨氏模量小于所述非弯曲部12的杨氏模量。
杨氏模量是指弯曲部11/非弯曲部12对外体现出来的杨氏模量，根据膜层材料或者膜层厚度不同，弯曲部11/非弯曲部12对外体现出来不同的杨氏模量。
本申请提供一种新的保护盖板，该保护盖板包括位于所述弯折区内的弯曲部、以及位于所述非弯折区的非弯曲部，所述弯曲部的杨氏模量小于所述非弯曲部的杨氏模量；这样，由于保护盖板的弯曲部具有较低的杨氏模量，可以通过弯折性测试，同时非弯折部（一般对应显示屏幕区域）具有较高的杨氏模量，可以通过压力测试，解决了现有保护盖板存在的非弯折部难以通过压力测试的技术问题。
所述弯曲部11的杨氏模量小于所述非弯曲部12的杨氏模量的实现方式可以是通过选择合适的材料来实现，例如弯曲部11与非弯曲部12采用杨氏模量不同的材料，这样就可以实现弯曲部11的杨氏模量小于所述非弯曲部12的杨氏模量，也可以是通过采用不同膜层厚度的方式来实现。
柔性AMOLED显示器和一般平面显示器在模组段(Module)结构上最大的差异, 就是不能像一般平面显示器那样使用玻璃盖板(Cover Glass), 因为玻璃的可弯折性低,弯折过程易碎。现今柔性AMOLED显示器所使用的盖板(Cover Window)材料皆为塑胶类材质CPI。然而, 显示器产品要求表面要能抗刮、抗冲击,而塑胶材质天生就不如玻璃来得硬,因此,一般商用塑胶盖板都会在塑胶表面涂布一层较硬的抗刮材质（HC，Hard Coating）。塑胶盖板包括基板与强化镀膜, 基板一般采用透明的聚酰亚胺(CPI),强化镀膜则可做单面镀膜(Single-side HC)和双面镀膜(Double-side HC)。
以下将结合具体的应用实例进行具体说明。
在一种实施例中，如图2所示，保护盖板1包括第一材料层S1以及第二材料层S2，所述第一材料层S1的杨氏模量小于所述第二材料层S2的杨氏模量，所述弯曲部11的膜层总厚度H1等于所述非弯曲部12的膜层总厚度H2；所述弯曲部的第二材料层S2厚度h21小于所述非弯曲部的第二材料层S2厚度h22。
第一材料层S1一般采用透明的聚酰亚胺(CPI)，而第二材料层S2采用较硬的抗刮材质（HC，Hard Coating）。
在一种实施例中，如图2所示，所述弯曲部11的第二材料层S2厚度h21相同，所述非弯曲部12的第二材料层S2厚度h22相同。也即在弯曲部11以及非弯曲部12内，第二材料层S2都是均匀设置的，这种方式设置简单。
在一种实施例中，所述弯曲部11的第二材料层S2厚度h21相同，所述非弯曲部12的第二材料层S2厚度h22从弯曲部11到边缘逐渐增大。
在一种实施例中，弯曲部11的第二材料层S2厚度h21不同，从第一非弯曲部到第二非弯曲部逐渐增大。
在一种实施例中，弯曲部11的第二材料层S2厚度h21不同，从第一非弯曲部到第二非弯曲部先减小后增大。
在一种实施例中，弯曲部11的第二材料层S2厚度h21不同，从第一非弯曲部到第二非弯曲部周期性变化。
在一种实施例中，如图3所示，所述保护盖板1包括第一材料层S1、第二材料层S2以及第三材料层S3，所述第一材料层S1位于所述第二材料层S2及所述第三材料层S3之间，所述第一材料层S1的杨氏模量小于所述第二材料层S2的杨氏模量，所述第一材料层S1的杨氏模量小于所述第三材料层S3的杨氏模量，所述弯曲部11的膜层总厚度H1等于所述非弯曲部12的膜层总厚度H2；所述弯曲部11的第一材料层S1厚度h11大于所述非弯曲部12的第一材料层S1厚度h12。
第一材料层S1一般采用透明的聚酰亚胺(CPI)，而第二材料层S2以及第三材料层S3采用较硬的抗刮材质（HC，Hard Coating）。
在一种实施例中，如图3所示，所述弯曲部11的第二材料层S2厚度h21小于所述非弯曲部12的第二材料层S2厚度h22。
在一种实施例中，如图3所示，所述弯曲部11的第二材料层S2厚度h21相同，所述非弯曲部12的第二材料层S2厚度h22相同。
在一种实施例中，如图3所示，所述弯曲部11的第三材料层S3厚度h31小于所述非弯曲部12的第三材料层S3厚度h32。
在一种实施例中，如图3所示，所述弯曲部11的第三材料层S3厚度h31相同，所述非弯曲部12的第三材料层S3厚度h32相同。
在一种实施例中，如图3所示，所述弯曲部11的第二材料层S2厚度h21与所述弯曲部11的第三材料层S3厚度h31相同。
在一种实施例中，如图3所示，所述非弯曲部12的第二材料层S2厚度h22与所述弯曲部11的第三材料层S3厚度h31相同。
在一种实施例中，所述第二材料层S2的杨氏模量与所述第三材料层S3的杨氏模量相同，例如采用相同的材料形成。
如图4所示，本申请实施例提供一种用于柔性显示装置2的保护盖板1，所述柔性显示装置2包括弯折区SS和非弯折区NS，所述保护盖板1包括位于所述弯折区SS内的弯曲部11、位于所述非弯折区NS的非弯曲部12（图4中的非弯曲部12a以及非弯曲部12b）、以及位于所述弯曲部11和所述非弯曲部12之间的过渡部14（图4中的非弯曲部13a以及非弯曲部13b），所述弯曲部11的杨氏模量小于所述非弯曲部12的杨氏模量，所述过渡部13的杨氏模量大于所述弯曲部11的杨氏模量、且小于所述非弯曲部12的杨氏模量。
在一种实施例中，如图4所示，过渡部13位于弯折区SS内。
不同部位的杨氏模量不同的实现方式可以是通过选择合适的材料来实现，例如弯曲部11、非弯曲部12以及过渡部13采用杨氏模量不同的材料，这样就可以实现不同部位局部不同的杨氏模量，也可以是通过采用不同膜层厚度的方式来实现。
在一种实施例中，如图5所示，保护盖板1包括第一材料层S1以及第二材料层S2，所述第一材料层S1的杨氏模量小于所述第二材料层S2的杨氏模量，所述弯曲部11的膜层总厚度H1、所述非弯曲部12的膜层总厚度H2以及过渡部13的膜层总厚度H3相同；所述弯曲部11的第二材料层厚度h21小于所述过渡部13的第二材料层厚度h23（平均厚度值），所述过渡部13的第二材料层厚度h23小于所述非弯曲部13的第二材料层厚度h22。
在一种实施例中，如图5所示，所述弯曲部11的第二材料层S2厚度h21相同，所述非弯曲部12的第二材料层S2厚度h22相同，所述过渡部13的第二材料层S2厚度h22从弯曲部11到非弯曲部12的方向上逐渐增大。也即在弯曲部11以及非弯曲部12内，第二材料层S2都是均匀设置的，这种方式设置简单。
在一种实施例中，如图5所示，过渡部13的第二材料层S2与第一材料层S1的接触面m的截面为直线。
在一种实施例中，过渡部13的第二材料层S2与第一材料层S1的接触面m的截面为曲线或者圆弧，或者曲线与直线的组合灯方式。
在一种实施例中，如图6所示，所述保护盖板1包括第一材料层S1、第二材料层S2以及第三材料层S3，所述第一材料层S1位于所述第二材料层S2及所述第三材料层S3之间，所述第一材料层S1的杨氏模量小于所述第二材料层S2的杨氏模量，所述第一材料层S1的杨氏模量小于所述第三材料层S3的杨氏模量，所述弯曲部11的膜层总厚度H1、所述非弯曲部12的膜层总厚度H2以及过渡部13的膜层总厚度H3相同；所述弯曲部11的第一材料层S1厚度h11大于所述过渡部13的第一材料层厚度h13（平均厚度值），所述过渡部13的第一材料层厚度h13大于所述非弯曲部12的第一材料层S1厚度h12。
在一种实施例中，如图6所示，所述弯曲部11的第二材料层S2厚度h21小于所述过渡部13的第二材料层厚度h23，所述过渡部13的第二材料层厚度h23小于所述非弯曲部12的第二材料层S2厚度h22。
在一种实施例中，如图6所示，所述弯曲部11的第二材料层S2厚度h21相同，所述非弯曲部12的第二材料层S2厚度h22相同，所述过渡部13的第二材料层厚度h22从弯曲部11到非弯曲部12的方向上逐渐增大。
在一种实施例中，如图6所示，所述弯曲部11的第三材料层S3厚度h31小于所述过渡部13的第三材料层S3厚度h33，所述过渡部13的第三材料层S3厚度h33小于所述非弯曲部12的第三材料层S3厚度h32。
在一种实施例中，如图6所示，所述弯曲部11的第三材料层S3厚度h31相同，所述非弯曲部12的第三材料层S3厚度h32相同。
在一种实施例中，如图6所示，所述弯曲部11的第二材料层S2厚度h21与所述弯曲部11的第三材料层S3厚度h31相同。
在一种实施例中，如图6所示，所述非弯曲部12的第二材料层S2厚度h22与所述弯曲部11的第三材料层S3厚度h31相同。
在一种实施例中，所述第二材料层S2的杨氏模量与所述第三材料层S3的杨氏模量相同，例如采用相同的材料形成。
在一种实施例中，如图6所示，过渡部13的第二材料层S2与第一材料层S1的接触面m1的截面为直线。
在一种实施例中，过渡部13的第二材料层S2与第一材料层S1的接触面m1的截面为曲线或者圆弧，或者曲线与直线的组合灯方式。
在一种实施例中，如图6所示，过渡部13的第三材料层S3与第一材料层S1的接触面m2的截面为直线。
在一种实施例中，过渡部13的第三材料层S3与第一材料层S1的接触面m2的截面为曲线或者圆弧，或者曲线与直线的组合灯方式。
对应的，在一种实施例中，本申请还提供了一种柔性显示装置，其包括柔性显示面板以及用于保护所述柔性显示面板的保护盖板，柔性显示装置包括弯折区和非弯折区，所述保护盖板包括位于所述弯折区内的弯曲部、以及位于所述非弯折区的非弯曲部，所述弯曲部的杨氏模量小于所述非弯曲部的杨氏模量。
这样，由于保护盖板的弯曲部具有较低的杨氏模量，可以通过弯折性测试，同时非弯折部（一般对应显示屏幕区域）具有较高的杨氏模量，可以通过压力测试，解决了现有保护盖板存在的非弯折部难以通过压力测试的技术问题。
在一种实施例中，所述保护盖板包括第一材料层以及第二材料层，所述第一材料层的杨氏模量小于所述第二材料层的杨氏模量，所述弯曲部的膜层总厚度等于所述非弯曲部的膜层总厚度；所述弯曲部的第二材料层厚度小于所述非弯曲部的第二材料层厚度。
在一种实施例中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度相同。
在一种实施例中，所述保护盖板包括第一材料层、第二材料层以及第三材料层，所述第一材料层位于所述第二材料层及所述第三材料层之间，所述第一材料层的杨氏模量小于所述第二材料层的杨氏模量，所述第一材料层的杨氏模量小于所述第三材料层的杨氏模量，所述弯曲部的膜层总厚度等于所述非弯曲部的膜层总厚度；所述弯曲部的第二材料层厚度小于所述非弯曲部的第二材料层厚度。
在一种实施例中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度相同。
在一种实施例中，所述弯曲部的第三材料层厚度小于所述非弯曲部的第三材料层厚度。
在一种实施例中，所述弯曲部的第三材料层厚度相同，所述非弯曲部的第三材料层厚度相同。
在一种实施例中，所述弯曲部的第二材料层厚度与所述弯曲部的第三材料层厚度相同，所述非弯曲部的第二材料层厚度与所述非弯曲部的第三材料层厚度相同。
在一种实施例中，所述第二材料层的杨氏模量与所述第三材料层的杨氏模量相同。
柔性显示屏幕具有轻薄、易携带等诸多优势，是OLED显示技术的重要开发方向。OLED屏幕的表面层Cover Window既要保证足够的硬度，又要保证耐弯折性好。
如图7所示，假设OLED柔性显示屏的弯折半径为R（目前主流产品为3mm或5mm），其包含一个长度（或弧长）为L0=π*R的弯折区域SS，和两个长度为L的非弯折区域NS1和NS2，显然L远大于L0。
如图8所示，现有塑胶盖板Cover Window结构80包括：位于上部分的均匀厚度的Harding Coating膜层81、位于下部份的均匀厚度的CPI膜层82，这种结构存在非弯折部难以通过压力测试的技术问题。
本实施例在OLED屏的非弯折区域增加杨氏模量高的Hard Coating厚度，在弯折区增加杨氏模量低的CPI厚度，这样在非弯折区提高了Cover Window和面板Panel的硬度，同时在弯折区又降低了Panel在弯折时的应力，保证了良好的耐弯折性，从而提高使用时的弯折次数。对OLED屏的弯折区和非弯折区Cover Window器件作不同厚度的结构上的设计，可以改善柔性屏幕的显示效果，提升柔性显示器的用户体验感，最终达到柔性屏幕的量产指标，为柔性显示产业带来较高的经济效益。
本实施例提供一种既可提高柔性OLED屏幕硬度，又能兼顾柔性OLED屏幕弯折性的Cover Window结构，该Cover Window结构由Hard Coating和CPI两层膜材组成，在非弯折区Hard Coating厚度要高于非弯折区的厚度；在弯折区CPI厚度要高于弯折区的厚度。
如图9所示，本实施例提供的用于兼顾柔性OLED显示屏幕硬度和弯折性的新型Cover Window结构90组成如下：位于上部分的非均匀厚度的Harding Coating膜层91、位于下部门非均匀厚度的CPI膜层92。
图10示意出了现有Cover Window结构与本实施例提出的新型Cover Window结构的柔性屏幕，在非弯折区铅笔硬度试验时的变形对比情况。如图10所示，在相同压力F下，现有盖板（图10中a所示）形变较大，而本实施例提供的塑胶盖板（图10中b所示）形变较小，这是由于本实施例提供的塑胶盖板采用加厚的Harding Coating结构的Cover Window器件刚性增强，在柔性屏幕的法向上提供了较好的支撑作用，外部载荷所造成的下陷深度降低，柔性屏幕抵抗外部载荷的性能得到提升，保证柔性叠层结构可以顺利通过铅笔硬度和纳米压痕测试。
同时如图11所示，在弯折区采用增厚的CPI结构的Cover Window器件刚性较弱，在弯折时受到的应力小，这样既提高了非弯折区的硬度，又兼顾了弯折区的耐弯折性。
根据上述实施例可知：
本申请提供一种新的保护盖板以及柔性显示装置，该保护盖板包括位于所述弯折区内的弯曲部、以及位于所述非弯折区的非弯曲部，所述弯曲部的杨氏模量小于所述非弯曲部的杨氏模量；这样，由于保护盖板的弯曲部具有较低的杨氏模量，可以通过弯折性测试，同时非弯折部（一般对应显示屏幕区域）具有较高的杨氏模量，可以通过压力测试，解决了现有保护盖板存在的非弯折部难以通过压力测试的技术问题。
综上所述，虽然本申请已以优选实施例揭露如上，但上述优选实施例并非用以限制本申请，本领域的普通技术人员，在不脱离本申请的精神和范围内，均可作各种更动与润饰，因此本申请的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种用于柔性显示装置的保护盖板，所述柔性显示装置包括弯折区和非弯折区，所述保护盖板包括位于所述弯折区内的弯曲部、以及位于所述非弯折区的非弯曲部，所述弯曲部的杨氏模量小于所述非弯曲部的杨氏模量。
  2. 根据权利要求1所述的保护盖板，其中，所述保护盖板包括第一材料层以及第二材料层，所述第一材料层的杨氏模量小于所述第二材料层的杨氏模量，所述弯曲部的膜层总厚度等于所述非弯曲部的膜层总厚度；所述弯曲部的第二材料层厚度小于所述非弯曲部的第二材料层厚度。
  3. 根据权利要求2所述的保护盖板，其中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度相同。
  4. 根据权利要求2所述的保护盖板，其中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度从弯曲部到边缘逐渐增大。
  5. 根据权利要求2所述的保护盖板，其中，所述弯曲部的第二材料层厚度不同，从第一非弯曲部到第二非弯曲部逐渐增大。
  6. 根据权利要求2所述的保护盖板，其中，所述弯曲部的第二材料层厚度不同，从第一非弯曲部到第二非弯曲部先减小后增大。
  7. 根据权利要求2所述的保护盖板，其中，所述弯曲部的第二材料层厚度不同，从第一非弯曲部到第二非弯曲部周期性变化。
  8. 根据权利要求1所述的保护盖板，其中，所述保护盖板包括第一材料层、第二材料层以及第三材料层，所述第一材料层位于所述第二材料层及所述第三材料层之间，所述第一材料层的杨氏模量小于所述第二材料层的杨氏模量，所述第一材料层的杨氏模量小于所述第三材料层的杨氏模量，所述弯曲部的膜层总厚度等于所述非弯曲部的膜层总厚度；所述弯曲部的第二材料层厚度小于所述非弯曲部的第二材料层厚度。
  9. 根据权利要求8所述的保护盖板，其中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度相同。
  10. 根据权利要求8所述的保护盖板，其中，所述弯曲部的第三材料层厚度小于所述非弯曲部的第三材料层厚度。
  11. 根据权利要求8所述的保护盖板，其中，所述弯曲部的第三材料层厚度相同，所述非弯曲部的第三材料层厚度相同。
  12. 根据权利要求8所述的保护盖板，其中，所述弯曲部的第二材料层厚度与所述弯曲部的第三材料层厚度相同。
  13. 根据权利要求8所述的保护盖板，其中，所述非弯曲部的第二材料层厚度与所述非弯曲部的第三材料层厚度相同。
  14. 根据权利要求8所述的保护盖板，其中，所述第二材料层的杨氏模量与所述第三材料层的杨氏模量相同。
  15. 一种柔性显示装置，其中，包括柔性显示面板以及用于保护所述柔性显示面板的保护盖板，所述柔性显示装置包括弯折区和非弯折区，所述保护盖板包括位于所述弯折区内的弯曲部、以及位于所述非弯折区的非弯曲部，所述弯曲部的杨氏模量小于所述非弯曲部的杨氏模量。
  16. 根据权利要求15所述的柔性显示装置，其中，所述保护盖板包括第一材料层以及第二材料层，所述第一材料层的杨氏模量小于所述第二材料层的杨氏模量，所述弯曲部的膜层总厚度等于所述非弯曲部的膜层总厚度；所述弯曲部的第二材料层厚度小于所述非弯曲部的第二材料层厚度。
  17. 根据权利要求16所述的柔性显示装置，其中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度相同。
  18. 根据权利要求15所述的柔性显示装置，其中，所述保护盖板包括第一材料层、第二材料层以及第三材料层，所述第一材料层位于所述第二材料层及所述第三材料层之间，所述第一材料层的杨氏模量小于所述第二材料层的杨氏模量，所述第一材料层的杨氏模量小于所述第三材料层的杨氏模量，所述弯曲部的膜层总厚度等于所述非弯曲部的膜层总厚度；所述弯曲部的第二材料层厚度小于所述非弯曲部的第二材料层厚度。
  19. 根据权利要求18所述的柔性显示装置，其中，所述弯曲部的第二材料层厚度相同，所述非弯曲部的第二材料层厚度相同。
  20. 根据权利要求18所述的柔性显示装置，其中，所述弯曲部的第二材料层厚度与所述弯曲部的第三材料层厚度相同，所述非弯曲部的第二材料层厚度与所述非弯曲部的第三材料层厚度相同。
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