WO2023236302A1 - 柔性显示装置 - Google Patents

柔性显示装置 Download PDF

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Publication number
WO2023236302A1
WO2023236302A1 PCT/CN2022/104023 CN2022104023W WO2023236302A1 WO 2023236302 A1 WO2023236302 A1 WO 2023236302A1 CN 2022104023 W CN2022104023 W CN 2022104023W WO 2023236302 A1 WO2023236302 A1 WO 2023236302A1
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Prior art keywords
layer
display device
flexible display
flexible
refractive index
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PCT/CN2022/104023
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English (en)
French (fr)
Inventor
戴喜娟
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武汉华星光电半导体显示技术有限公司
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Publication of WO2023236302A1 publication Critical patent/WO2023236302A1/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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to the technical field of manufacturing display panels, and in particular, to a flexible display device.
  • the flexible display panels provided in the prior art have unsatisfactory bending performance of the internal flexible folding module structure, and there are many creases in the bending area, which is not conducive to the display effect in this area and the display panel. Improvement of overall performance.
  • embodiments of the present invention provide a display device to effectively improve the problems of many fold marks in the bending area and unsatisfactory display effects when the display device is bent.
  • the present invention provides a flexible display device, including:
  • the flexible display device includes:
  • a light enhancement layer is provided on the display module and at least in the bending area;
  • the light enhancement layer includes a hardened layer and an anti-reflective layer disposed on the hardened layer, the anti-reflective layer is disposed on a side of the hardened layer away from the display module, and the hardened layer
  • the corresponding refractive index is greater than the refractive index of the anti-reflection layer
  • the difference between the refractive index of the hardened layer and the refractive index of the anti-reflection layer is 0.2.
  • the refractive index of the anti-reflection layer is 1.4-1.75, and the refractive index of the hardened layer is 1.8-2.2.
  • the thickness of the hardened layer and the film thickness of the anti-reflection layer are both less than 500 nm.
  • the light enhancement layer further includes a first buffer layer, the first buffer layer is provided on the display module, the hardening layer is provided on the buffer layer, and the anti-reflection layer A layer is provided on the hardened layer.
  • the thickness of the first buffer layer is less than 30um.
  • a flexible display device including:
  • the flexible display device includes:
  • a light enhancement layer is provided on the display module and at least in the bending area;
  • the light enhancement layer includes a hardened layer and an anti-reflective layer disposed on the hardened layer, the anti-reflective layer is disposed on a side away from the display module, and the refractive index corresponding to the hardened layer Greater than the refractive index of the antireflection layer.
  • the refractive index of the anti-reflection layer is 1.4-1.75, and the refractive index of the hardened layer is 1.8-2.2.
  • the thickness of the hardened layer and the film thickness of the anti-reflection layer are both less than 500 nm.
  • the light enhancement layer further includes a first buffer layer, the first buffer layer is provided on the display module, and the hardening layer is provided on the first buffer layer.
  • the thickness of the first buffer layer is less than 30um.
  • the material of the first buffer layer includes any one of transparent polyimide and transparent glass.
  • the reflectance of the light enhancement layer is less than 5%, and the transmittance of the light enhancement layer is greater than 91%.
  • the material of the hardened layer is polyethylene terephthalate.
  • the display module further includes a second buffer layer and a backplane, the second buffer layer is disposed on the backplane, and the backplane is disposed away from the display module.
  • the second buffer layer is disposed on the backplane
  • the backplane is disposed away from the display module.
  • One side of the light enhancement layer is disposed on the backplane.
  • the material of the back plate includes any one of polyacrylonitrile-based carbon fiber and polyurethane resin-based carbon fiber.
  • the material of the second buffer layer includes any one of foam and black thermoplastic polyurethane elastomer.
  • the back plate is provided with a hollow structure in the bending area.
  • the hollow structure includes at least one of a hollow grid, a hollow strip, and a hollow hole.
  • the display module further includes a light-absorbing layer, and the light-absorbing layer is disposed on a side of the display module close to the light enhancement layer.
  • the display device includes: a display module, and the display module includes:
  • a support layer, the support layer is provided on the back plate
  • a flexible panel, the flexible panel is arranged on the support layer;
  • a polarizer is disposed on the flexible panel, and the light enhancement layer is disposed on the polarizer;
  • An embodiment of the present invention provides a flexible display device.
  • the flexible display device includes a bending area and a straight area.
  • the display device also includes a display module and a light enhancement layer.
  • the light enhancement layer includes a hardened layer and an anti-reflection layer provided on one side of the hardened layer.
  • the hardened layer corresponds to The refractive index is greater than the corresponding refractive index of the anti-reflection layer.
  • Figure 1 is a schematic structural diagram of a flexible folding device provided in the prior art
  • Figure 2 is a schematic plan view of a flexible display device provided in an embodiment of the present application.
  • Figure 3 is a schematic diagram of the corresponding film layer structure of the flexible display device provided in the embodiment of the present application.
  • Figure 4 is a schematic structural diagram of the light enhancement provided in the embodiment of the present application.
  • Figure 5 is a schematic diagram of the grating imaging effects corresponding to the bending area of different film layer structures provided in the embodiment of the present application;
  • Figure 6 is a schematic diagram of the film layer structure of another flexible display device provided by an embodiment of the present application.
  • Figure 7 is a schematic diagram of the film layer structure of another flexible display device provided by an embodiment of the present application.
  • Figure 8 is a schematic structural diagram of the backplane provided in the embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of the folded flexible display device provided in the embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a flexible folding device provided in the prior art.
  • the display device 100 includes a first folding part 102 and a second folding part 103.
  • the display device 100 also includes a bending area 101.
  • the display device 100 can be bent relative to the bending area 101.
  • the first folding portion 102 covers the second folding portion 103, thereby reducing the size of the display device and making it easier to carry.
  • the flexible screen in the display device will form folding marks 104 at the bending area 101.
  • the folding marks 104 will appear on both the inside and outside of the flexible screen.
  • multiple fold marks appear along the direction of the bending axis of the bending area 101 .
  • the bending effect of the flexible display device prepared in the prior art is not ideal. If the stress in the bending area is large, the large stress will further increase the number and depth of the folding marks 104. When the When the display device 100 is unfolded and displayed, the fold marks 104 formed in this area will directly affect the display effect in this area, thereby reducing the overall performance of the display panel.
  • Embodiments of the present application provide a flexible display device to effectively improve the bending performance of the flexible display device and the display effect in the bending area.
  • FIG. 2 is a schematic plan view of a flexible display device provided in an embodiment of the present application.
  • the flexible display device 100 includes a bending area 101 and a flat area 202.
  • the flat area 202 can be disposed on at least one side of the bending area 101.
  • the bending area 101 is disposed on a straight area.
  • the middle position of the region 202 allows the straight region 202 to be bent or folded relative to the bent region 101 .
  • the folding stress of the flexible display device 100 at the bending area 101 is smaller and there are fewer fold marks, thereby effectively improving the performance of the flexible display device. Overall performance.
  • FIG. 3 is a schematic diagram of the corresponding film layer structure of the flexible display device provided in the embodiment of the present application.
  • the flexible display device includes a display module 20 and a light enhancement layer 201 .
  • the light enhancement layer 201 can be disposed on the display module 20 .
  • the light enhancement layer 201 is directly attached to the display module 20 .
  • the display module 20 is provided with a multi-layer film layer structure stacked on each other.
  • the display module 20 also includes a first optical adhesive layer 203, a polarizer 204, a second optical adhesive layer 205, a flexible panel 206, a third optical adhesive layer 207, a support layer 208, a fourth optical Glue layer 209 and back plate 210.
  • the fourth optical adhesive layer 209 is disposed on the back plate 210, and the support layer 208 is disposed on the fourth optical adhesive layer 209.
  • the fourth optical adhesive layer 209 bonds the back plate 210 and the support layer 208. .
  • a third optical adhesive layer 207 is disposed on the support layer 208, and the flexible panel 206 is disposed on the third optical adhesive layer 207.
  • the third optical adhesive layer 207 bonds the flexible panel 206 to the support layer 208.
  • the second optical adhesive layer 205 is disposed on the flexible panel 206, and the polarizer 204 is disposed on the second optical adhesive layer 205.
  • the polarizer 204 and the flexible panel 206 are bonded through the second optical adhesive layer 205.
  • the first optical adhesive layer 203 is disposed on the polarizer 204, and the light enhancement layer 201 is disposed on the first optical adhesive layer 203.
  • the light enhancement layer 201 is bonded to the display module through the first optical adhesive layer 203. 20 on the polarizer 204.
  • the first optical adhesive layer 203, the second optical adhesive layer 205 and the third optical adhesive layer 207 can be the same optical adhesive layer, for example, they are all optical pressure-sensitive adhesive layers, which are not specifically limited here.
  • the back plate 210 can be selected from a lightweight carbon fiber material, such as any one of polyacrylonitrile-based carbon fiber and polyurethane resin-based carbon fiber, and the back plate 210 is hollowed out in the bending area 101 set up.
  • the back plate in this area is configured as at least one of a hollow grid, a hollow strip, and a hollow hole.
  • the light enhancement layer 201 since the light enhancement layer 201 is provided in the bending area 101 of the flexible display device, the light enhancement layer 201 effectively improves the display effect of the bending area 101 .
  • Figure 4 is a schematic structural diagram of the light enhancement layer provided in the embodiment of the present application.
  • the light enhancement layer 201 may include a base 301, a hardened layer 302 and an anti-reflective layer 303.
  • the base 301 is disposed on the display module
  • the hardening layer 302 is disposed on the base 301
  • the anti-reflection layer 303 is disposed on the hardening layer 302 .
  • the substrate 301 may be a first buffer layer, and other film layers are buffered and supported through the substrate 301.
  • the substrate 301 can be a flexible substrate or a hard first buffer layer.
  • the flexible base material can be a flexible polyimide film layer.
  • the polyimide film The layer is a transparent film material.
  • the material of the substrate 301 may be selected as a transparent glass layer.
  • the transparent glass layer is preferably ultra-thin glass (UTG). Therefore, on the premise of reducing the thickness of the film layer, the folding stress problem in the bending area can be effectively improved, and the comprehensive performance of the flexible display device can be improved.
  • UTG ultra-thin glass
  • the thickness of the base 301 is set to less than 30um, thereby effectively improving the bending performance in the bending area.
  • the hardened layer 302 is directly provided on the substrate 301 .
  • the hardened layer 302 has a certain hardness, so that it can better support and stabilize the film layer thereon.
  • the material of the hardened layer 302 can be selected as an organic transparent film layer material.
  • the hardened layer 302 can be a polyethylene terephthalate or other transparent polymer material layer.
  • the hardened layer 302 When disposing the hardened layer 302, the hardened layer 302 can be directly coated on the substrate 301 through a wet coating process and dried to form a film, finally forming the hardened layer 302 provided in the embodiment of the present application.
  • the anti-reflection layer 303 is directly disposed on the hardened layer 302 , and the hardness of the anti-reflective layer 303 is smaller than the hardness of the hardened layer 302 .
  • the material of the anti-reflection layer 303 may be an inorganic material film layer, such as silicon dioxide and other inorganic material film layers.
  • the hardened layer 302 and the hardened layer 302 form a film structure that combines inorganic and organic elements.
  • the film thicknesses of the anti-reflection layer 303 and the hardened layer 302 are both less than 500um.
  • the film thicknesses of the anti-reflection layer 303 and the hardening layer 302 can be set to the same thickness, and at the same time, the film thicknesses of the anti-reflection layer 303 and the hardening layer 302 are equal at different positions. Set to 200nm. This ensures that the thickness of the light enhancement layer is as thin as possible without affecting its various properties.
  • the corresponding light refractive index of the hardened layer 302 is also made larger than the refractive index of the anti-reflection layer 303 .
  • the refractive index corresponding to the hardened layer 302 is 1.8-2.2
  • the refractive index corresponding to the anti-reflection layer 303 is 1.4-1.75.
  • two different refractive indexes are formed between the hardened layer 302 and the anti-reflection layer 303 .
  • the refractive index of the hardened layer 302 is set to 1.9, and at the same time, the refractive index of the anti-reflection layer is set to 1.7.
  • the refractive index of the hardened layer is set to 1.85
  • the refractive index of the anti-reflective layer is set to 1.65
  • the corresponding light refractive index between the hardened layer and the anti-reflection layer has a difference, for example, the difference is 0.2, so as to further improve the effect of the light enhancement layer.
  • the light enhancement layer 201 can also be configured as a structure in which multiple film layers are stacked.
  • the hardened layer 302 and the anti-reflection layer 303 are stacked on each other in sequence, and are both arranged into two layers. Therefore, the effect of the light enhancement layer 201 on light can be further improved. And effectively reduce the degree of fold visibility of the display device to improve the display effect of the device.
  • FIG. 5 is a schematic diagram of the grating imaging effects corresponding to different film layer structures in the bending area provided in the embodiment of the present application.
  • Figure a in Figure 5 corresponds to a schematic diagram of the display effect of the bending area after bending the display device in the prior art
  • Figure b corresponds to a schematic diagram of the display effect of the corresponding bending area after the light enhancement layer is provided in the embodiment of the present application.
  • Multiple folds 401 will be formed in the center of the bending area, and the multiple folds 401 formed will have a greater impact on the display effect of the area.
  • the hardening layer since the light enhancement layer is provided on the display module, and at the same time, a hardening layer is provided inside the light enhancement, the hardening layer also has good bending properties, and when used for the flexible display device When bending, the bending radius of the bending area 101 can be further reduced.
  • the bending radius of the film layer corresponding to the bending area 101 may be less than 1.2 mm. And under this ultra-small bending radius, the bending area still has a good display effect. This effectively improves the overall performance of the flexible display device.
  • the reflectivity of the light enhancement layer 201 is less than 5%, and the light transmittance of the light enhancement layer 201 is greater than 91%. Thereby effectively improving the display effect in the bending area.
  • FIG. 6 is a schematic diagram of the film layer structure of another flexible display device provided by an embodiment of the present application.
  • the flexible display device includes a light enhancement layer 201 and a display module 20 .
  • the display module 20 also includes a first optical adhesive layer 203, a light absorbing layer 702, a flexible panel 206, a third optical adhesive layer 207, a support layer 208, a fourth optical adhesive layer 209, and a second buffer layer arranged in sequence. 701 and backplane 210.
  • the film layer settings and materials of the first optical adhesive layer 203, the flexible panel 206, the third optical adhesive layer 207, the support layer 208 and the fourth optical adhesive layer 209 are the same as the above-mentioned film layer structures.
  • the light-absorbing layer 702 can be a black light-absorbing layer, and the light-absorbing layer 702 can also be a coated filter.
  • the polarizer in the existing display panel with a black light-absorbing layer 702 and a coated filter, it can effectively Reduce the thickness of the panel.
  • the corresponding bending stress will be further reduced after bending, thereby effectively improving the bending performance of the bending area and reducing the number of creases in the bending area. , thereby improving the display effect of the flexible display panel in the bending area.
  • the thickness of the black light-absorbing layer 702 is preferably less than 50 ⁇ m.
  • the flexible display device in the embodiment of the present application further includes a second buffer layer 701.
  • FIG. 7 is a schematic diagram of the film layer structure of another flexible display device provided by an embodiment of the present application.
  • the second buffer layer 701 may include foam and a thermoplastic elastic layer.
  • the second buffer layer 701 in Figure 6 is configured as foam, and the foam structure has a porous structure inside.
  • the porous structure in the foam can be open pores, closed pores, or a combination of open pores and closed pores.
  • the specific porous structure can be set according to the performance and function of the actual product. When the flexible display device is subjected to external force, such as bending or falling impact, its internal porous structure can effectively act as a buffer, thereby improving the performance of the flexible display device.
  • the second buffer layer 701 in Figure 7 is configured as a thermoplastic elastic layer.
  • the thermoplastic elastic layer can be a black thermoplastic polyurethane elastomer.
  • the black thermoplastic polyurethane elastomer has good elastic properties, and the thickness of the thermoplastic polyurethane elastomer is thin, preferably less than 40um, thereby further reducing the thickness of the film layer and reducing the bend formed during bending. stress.
  • Table 1 shows a display device formed by using the above two different materials for the second buffer layer 701 in the embodiment of the present application.
  • the structures of other film layers are the same.
  • the second buffer layer is made of foam
  • the second buffer layer is made of black thermoplastic polyurethane elastomer, and they are bent respectively.
  • the performance data in the above table it can be seen that the flexible display devices formed by the two have good performance.
  • the second buffer layer is made of black thermoplastic polyurethane elastomer, its performance in pen-drop test and ball-drop test is better than that of foam material.
  • the number of creases corresponding to the bending area becomes smaller, with only 3-5 creases, thereby further improving the display effect in the bending area.
  • the second buffer layer when the second buffer layer is made of black thermoplastic polyurethane elastomer, its thickness can be further reduced. For example, if the second buffer layer is set to 40um, the corresponding flexible display device still has better performance. performance and thinner thickness.
  • the back plate 210 is made of lightweight material, such as carbon fiber material that is easy to bend.
  • the back plate 210 is made of polyacrylonitrile-based carbon fiber, polyurethane resin-based carbon fiber or other materials.
  • the thickness of the back plate 210 is set to less than 90um, so as to achieve a light and thin configuration while ensuring the performance of the display device.
  • Table 2 shows the corresponding bending stress when the back plates provided in the embodiments of the present application are made of different materials.
  • Solution 3 is the display device prepared by using a conventional iron-nickel-containing laminated backplane
  • Solution 4 is a display device prepared by using the carbon fiber-containing laminated backplane provided in the embodiments of the present application.
  • the prepared display device. All other common film layers are of the same thickness and material.
  • the bending radius of the device is 1.5mm
  • the bending radius of the device is 1mm.
  • Figure 8 is a schematic structural diagram of the backplane provided in the embodiment of the present application.
  • a structure in which the back plate 210 is configured as a hollow strip in the bending area 101 is taken as an example for description.
  • a plurality of hollow strips 901 are arranged alternately on the back plate 210 in sequence, and the distance between two adjacent hollow strips 901 can be made the same, thereby ensuring the consistency of the performance of the back plate.
  • the hollow strips can effectively reduce the bending stress of the backplane and improve the bending performance of the flexible display device.
  • the hollow strips can further reduce the weight of the backplane, thereby achieving a thinner and lighter design of the flexible display device.
  • the back plate 210 can also be provided with other shapes of hollow structures, such as multiple hollow holes, hollow ellipses and other shapes. By providing the hollow structure, the deformation stress between the film layers in the bending area 101 can be effectively reduced. .
  • the polyacrylonitrile-based carbon fiber when preparing the backsheet, can be carbonized, prepregned, bonded, hot-pressed, laser cut, and coated to finally form a backsheet with a fiber structure.
  • the fiber structure When the backboard is bent, the fiber structure can effectively reduce the rebound force, thereby reducing the creases in the bending area and improving the display effect.
  • Figure 9 is a schematic structural diagram of the folded flexible display device provided in the embodiment of the present application.
  • the flexible display device 100 After the flexible display device 100 is folded, its volume and expansion area are reduced to half of the original size, and the bending area 101 has a smaller bending radius.
  • the bending radius is less than 1.2mm.
  • the number of creases on the corresponding film layer in the bending area 101 is small.
  • the degree of visibility of the creases is lower, which is more effective.
  • the display effect of the flexible display device is improved.
  • the flexible display device can be applied to any product or component with flexible bending or folding functions, such as mobile phones, computers, laptops, digital photo frames, etc., and its specific type is not specifically limited.

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  • General Physics & Mathematics (AREA)
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  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

一种柔性显示装置（100），包括显示模组（20）及光增强层（201），光增强层（201）包括硬化层（302）及减反层（303），硬化层（302）对应的折射率大于减反层（303）对应的折射率，通过在显示模组（20）的弯折区域（101）内设置光增强层（201），以降低折痕（104）的视觉效应，并且改变膜层结构，以减少弯折区域（101）的折痕（104）并提高显示效果。

Description

柔性显示装置 技术领域
本发明涉及显示面板的制造技术领域，尤其涉及一种柔性显示装置。
背景技术
随着显示面板制备工艺等显示技术的发展，人们对显示面板及装置的性能及质量均提出了更高的要求。
其中，柔性材料的发展及日渐成熟，具备柔性可折叠有机发光二极管(Organic light-emitting diode，OLED)器件的手机设备掀起近年高端手机的浪潮。越来越多的手机厂商投入到柔性可折叠手机的开发中。其中，对于柔性显示面板而言，由于柔性面板具有较好弯曲性能，其可随使用工况的不同而进行一定程度的弯曲或者折叠，因此，被广泛应用于多种领域中。但是，对于柔性显示面板而言，其弯曲性能的好坏将直接影响到显示面板的质量。柔性显示面板内部通常采用柔性折叠模组的结构，而该柔性折叠模组多为模组堆叠的结构，在对多层模组构成的柔性面板进行弯折时，在弯折区域处会形成较大的弯折应力，因此，在弯折时，该弯折区域常常会出现较多的折痕，这些折痕在显示面板进行显示时，严重影响了该区域的显示效果，并且，由于现有的模组的弯折性能较弱，在对其弯折时，需要施加较大的应力，才能使其弯折，当用力过大时，会进一步造成该区域内折痕的数量，从而降低该区域内的显示效果，进而不利于显示面板的综合性能的提高。
因此需要对现有技术中的问题提出解决方法。
技术问题
综上所述，现有技术中提供的柔性显示面板，其内部的柔性折叠模组结构的弯折性能不理想，且在弯折区域处折痕较多，不利于该区域显示效果以及显示面板综合性能的提高。
技术解决方案
为解决上述问题，本发明实施例提供一种显示装置，以有效的改善显示装置在进行弯折时，弯折区域内的折叠痕较多，显示效果不理想等问题。
为解决上述技术问题，本发明提供一种柔性显示装置，包括：
弯折区域以及设置在所述弯折区域至少一侧的平直区域，所述柔性显示装置包括：
显示模组；以及，
光增强层，设置于所述显示模组之上，并至少设置在所述弯折区域内；
其中，所述光增强层包括一硬化层以及设置在所述硬化层上的减反层，所述减反层设置在所述硬化层远离所述显示模组的一侧，且所述硬化层对应的折射率大于所述减反层的折射率；
其中，所述硬化层的折射率与所述减反层的折射率之间的差值为0.2。
根据本发明一实施例，所述减反层的折射率为1.4-1.75，所述硬化层的折射率为1.8-2.2。
根据本发明一实施例，所述硬化层的厚度与所述减反层的膜层厚度均小于500nm。
根据本发明一实施例，所述光增强层还包括第一缓冲层，所述第一缓冲层设置在所述显示模组上，所述硬化层设置在所述缓冲层上，所述减反层设置在所述硬化层上。
根据本发明一实施例，所述第一缓冲层的厚度小于30um。
根据本申请实施例的第二方面，还提供一种柔性显示装置，包括：
弯折区域以及设置在所述弯折区域至少一侧的平直区域，所述柔性显示装置包括：
显示模组；以及，
光增强层，设置于所述显示模组之上，并至少设置在所述弯折区域内；
其中，所述光增强层包括一硬化层以及设置在所述硬化层上的减 反层，所述减反层设置在远离所述显示模组的一侧，且所述硬化层对应的折射率大于所述减反层的折射率。
根据本发明一实施例，所述减反层的折射率为1.4-1.75，所述硬化层的折射率为1.8-2.2。
根据本发明一实施例，所述硬化层的厚度与所述减反层的膜层厚度均小于500nm。
根据本发明一实施例，所述光增强层还包括第一缓冲层，所述第一缓冲层设置在所述显示模组上，所述硬化层设置在所述第一缓冲层上。
根据本发明一实施例，所述第一缓冲层的厚度小于30um。
根据本发明一实施例，所述第一缓冲层的材料包括透明聚酰亚胺以及透明玻璃中的任意一种。
根据本发明一实施例，所述光增强层的反射率小于5％，且所述光增强层的透过率大于91％。
根据本发明一实施例，所述硬化层的材料为聚对苯二甲酸乙二醇酯。
根据本发明一实施例，所述显示模组还包括第二缓冲层以及背板，所述第二缓冲层设置在所述背板之上，且所述背板设置在所述显示模组远离所述光增强层的一侧。
根据本发明一实施例，所述背板的材料包括聚丙烯腈基碳纤维、聚氨酯树脂基碳纤维中的任意一种。
根据本发明一实施例，所述第二缓冲层的材料包括泡棉以及黑色热塑性聚氨酯弹性体中的任意一种。
根据本发明一实施例，所述背板在所述弯折区域设置为镂空结构。
根据本发明一实施例，所述镂空结构包括镂空网格、镂空条以及镂空孔中的至少一种。
根据本发明一实施例，所述显示模组还包括吸光层，所述吸光层设置在所述显示模组靠近所述光增强层的一侧。
根据本发明一实施例，所述显示装置包括：显示模组，所述显示 模组包括:
背板；
支撑层，所述支撑层设置于所述背板之上；
柔性面板，所述柔性面板设置与所述支撑层之上；
偏光片，所述偏光片设置与所述柔性面板之上，所述光增强层设置于所述偏光片之上；以及，
设置于各膜层之间的光学胶层。
有益效果
综上所述，本发明实施例的有益效果为：
本发明实施例提供一种柔性显示装置。其中，该柔性显示装置包括弯折区域以及平直区域，该显示装置还包括显示模组及光增强层，光增强层包括硬化层及设置在硬化层一侧的减反层，该硬化层对应的折射率大于该减反层对应的折射率。通过在显示模组的弯折区域内设置光增强层，当进行弯折时，弯折区域内会形成对应的折痕，由该折痕所对应的光线经过该光增强层时，会被该光增强层影响，进而降低使用者对折痕的视觉效应从而提高显示效果，同时，本申请实施例中的显示模组采用纤维材料，进一步的降低弯折区域的应力，有效的提高了显示装置的综合性能。
附图说明
图1为现有技术中提供的柔性折叠装置的结构示意图；
图2为本申请实施例中提供的一种柔性显示装置的平面结构示意图；
图3为本申请实施例中提供的柔性显示装置对应膜层结构示意图；
图4为本申请实施例中提供的光增强的结构示意图；
图5为本申请实施例中提供的不同膜层结构在弯折区域对应的光栅成像效果示意图；
图6为本申请实施例提供的另一柔性显示装置的膜层结构示意 图；
图7为本申请实施例提供的又一柔性显示装置的膜层结构示意图；
图8为本申请实施例中提供的背板的结构示意图；
图9为本申请实施例中提供的柔性显示装置折叠后的结构示意图。
本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本揭示可用以实施的特定实施例。
随着显示面板制备技术的不断发展，尤其是对于柔性折叠显示装置制备技术的发展，人们对柔性弯曲以及折叠显示装置的性能和显示效果提出了更高的要求。
如图1所示，图1为现有技术中提供的柔性折叠装置的结构示意图。该显示装置100包括第一折叠部102以及第二折叠部103，同时，该显示装置100还包括一弯折区域101。该显示装置100可相对该弯折区域101进行弯折，在进行弯折时，第一折叠部102相对第二折叠部103盖和，从而实现缩小显示装置体积并方便携带等效果。但是，现有技术中，在对该显示装置100进行弯曲以及折叠时，在多次折叠的过程中，该显示装置内的柔性屏会在该弯折区域101处形成折叠痕迹104，该折叠痕迹104会出现在柔性屏的内外两侧。如顺着该弯折区域101的弯曲轴线方向出现多条折叠痕。并且，现有技术中制备得到的柔性显示装置的弯折效果也不理想，如该弯折区域处的应力较大，较大的应力会进一步的增大折叠痕迹104的数量以及深度，当将该显示装置100展开并显示时，该区域处形成的折叠痕迹104会直接影响到该区域处的显示效果，进而降低显示面板的综合性能。
本申请实施例提供一种柔性显示装置，以有效的提高该柔性显示装置的弯折性能以及该弯折区域处的显示效果。
如图2所示，图2为本申请实施例中提供的一种柔性显示装置的 平面结构示意图。该柔性显示装置100包括弯折区域101以及平直区域202，该平直区域202可设置在弯折区域101的至少一侧位置处，本申请实施例中，该弯折区域101设置在平直区域202的中间位置，从而使得该平直区域202可相对该弯折区域101发生弯曲或者折叠。本申请实施例中，当对该柔性显示装置进行弯曲或折叠时，该柔性显示装置100在该弯折区域101处的折叠应力更小，且折叠痕更少，从而有效的提高柔性显示装置的综合性能。
进一步的，如图3所示，图3为本申请实施例中提供的柔性显示装置对应膜层结构示意图。该柔性显示装置包括显示模组20以及光增强层201。其中，该光增强层201可设置在该显示模组20之上，本申请实施例中，将该光增强层201直接贴合在该显示模组20上。
具体的，该显示模组20内设置有多层相互堆叠设置的膜层结构。本申请实施例中，该显示模组20内还包括第一光学胶层203、偏光片204、第二光学胶层205、柔性面板206、第三光学胶层207、支撑层208、第四光学胶层209以及背板210。
其中，该第四光学胶层209设置在该背板210上，支撑层208设置在该第四光学胶层209上，该第四光学胶层209将该背板210与支撑层208相粘合。
同时，第三光学胶层207设置在该支撑层208上，柔性面板206设置在该第三光学胶层207上，该第三光学胶层207将柔性面板206与该支撑层208相粘合。
进一步的，该第二光学胶层205设置在柔性面板206上，偏光片204设置在该第二光学胶层205上，通过该第二光学胶层205将偏光片204与柔性面板206粘合。
同时，第一光学胶层203设置在该偏光片204上，光增强层201设置在该第一光学胶层203上，通过该第一光学胶层203将光增强层201粘合在显示模组20的偏光片204上。当该柔性显示装置发生弯折时，显示模组内的各膜层以及光增强层201在弯曲力的作用下发生弯折。
本申请实施例中，上述第一光学胶层203、第二光学胶层205以及第三光学胶层207可为相同的光学胶层，如均为光学压敏胶层，这里不做具体限定。同时，本申请实施例中，该背板210可选取为碳纤维轻量材料，如聚丙烯腈基碳纤维、聚氨酯树脂基碳纤维中的任意一种，且该背板210在该弯折区域101内镂空设置。如将该区域内的背板设置为镂空网格、镂空条以及镂空孔中的至少一种。
本申请实施例中，在该柔性显示装置的弯折区域101内，由于设置有该光增强层201，通过该光增强层201有效的改善该弯折区域101的显示效果。
如图4所示，图4为本申请实施例中提供的光增强层的结构示意图。具体的，该光增强层201可包括基底301、硬化层302以及减反层303。其中，该基底301设置在显示模组之上，该硬化层302设置在该基底301上，同时，该减反层303设置在该硬化层302上。
进一步的，本申请实施例中，该基底301可为第一缓冲层，通过该基底301对其他膜层进行缓冲和支撑。其中，基底301可选取柔性基底或者硬性第一缓冲层，当该基底301选取为柔性基底材料层时，该柔性基底材料可为柔性的聚酰亚胺膜层，同时，该聚酰亚胺膜层为透明膜层材料。当该柔性基底材料选取为刚性基底材料时，该基底301的材料可选取为透明玻璃层。
本申请实施例中，该透明玻璃层优选为超薄玻璃(Ultra thin glass，UTG)。从而在降低该膜层厚度的前提下，并有效的改善该弯折区域内的折叠应力问题，提高柔性显示装置的综合性能。
具体的，本申请实施例中，该基底301的厚度设置为小于30um，从而有效的改善该弯折区域内的弯折性能。
进一步的，本申请实施例中，该硬化层302直接设置在基底301上。该硬化层302具有一定的硬度，从而能较好的对其上的膜层进行支撑并稳定。具体的，该硬化层302的材料可选取为有机透明膜层材料，如该硬化层302为聚对苯二甲酸乙二醇酯或者其他透明的高分子聚合材料层。
其中，在设置该硬化层302时，可通过湿法涂布的工艺，直接涂布在该基底301上，并使其干燥成膜，最终形成本申请实施例中提供的硬化层302。
优选的，该减反层303直接设置在硬化层302上，该减反层303的硬度小于该硬化层302的硬度。本申请实施例中红，该减反层303的材料可设置为无机材料膜层，如二氧化硅等无机材料膜层。从而与硬化层302形成无机与有机相结合的膜层结构。
优选的，该减反层303以及该硬化层302的膜层厚度均小于500um。优选的，本申请实施例中，该减反层303和该硬化层302的膜层厚度可设置为相同的厚度，同时，该减反层303和硬化层302的膜层厚度在不同位置处均设置为200nm。从而保证该光增强层的膜层厚度尽可能薄，而不会对其各项性能造成影响。
具体的，本申请实施例中，在设置该光增强层201以及其对应的各膜层结构时，还使该硬化层302对应的光折射率大于该减反层303的折射率。优选的，该硬化层302对应的折射率为1.8-2.2，该减反层303对应的折射率为1.4-1.75。从而使得该硬化层302与该减反层303之间形成两不同的折射率。优选的，该硬化层302的折射率设置为1.9，同时，该减反层的折射率设置为1.7。或者，该硬化层的折射率设置为1.85，该减反层的折射率设置为1.65。本申请实施例中，使得硬化层与减反层之间对应的光折射率具有一差值，如该差值为0.2，以进一步提高该光增强层的作用效果。
该柔性显示装置在弯折过程中，其弯折区域101处对应的膜层会形成折叠痕。当光线依次经过该光增强层中的基底301、硬化层302以及减反层303时，由于该硬化层302与该减反层303的折射率不同，且硬化层302的折射率大于减反层303的折射率，不同折射率的膜层会对光线形成不同的影响。
进一步的，本申请实施例中，还可将该光增强层201设置为多层膜层相堆叠的结构。如将该硬化层302与该减反层303相互依次堆叠，并均设置为两层。从而可进一步的提高该光增强层201对光线的作用 效果。并有效的降低该显示装置的折痕可视化程度，以提高装置的显示效果。
如图5所示，图5为本申请实施例中提供的不同膜层结构在弯折区域对应的光栅成像效果示意图。其中，图5中的a图对应现有技术中的显示装置弯折后弯折区域的显示效果示意图，b图对应本申请实施例中设置该光增强层后对应的弯折区域的显示效果示意图。在该弯折区域中心会形成多条折痕401，其中，所形成的多条折痕401会对该区域的显示效果造成较大的影响。在a图中，观察到该弯折区域101内，由折痕401成像所形成的光栅的曲率变化较大，即该区域内的成像条纹具有较大的起伏情况，此时说明该折痕具有较大的不平整度，而较大的不平整度会直接影响到该区域的显示效果，进而降低柔性显示面板的性能。
而在b图中，观察到该弯折区域101内，由折痕401所形成的光栅条纹对应的曲率变化较小，即条纹的整体起伏度降低，此时说明该区域内对应的折痕的平整度提高，当使用者观察该弯折区域101时，该区域在视觉上具有更好的平整性，从而有效的提高了该柔性显示面板弯折区域101的显示效果。
优选的，本申请实施例中，由于在该显示模组上设置光增强层，同时，该光增强内设置有一硬化层，该硬化层也具有较好的弯折性，当对该柔性显示装置进行弯折时，可进一步减小该弯折区域101的弯折半径。本申请实施例中，该弯折区域101对应的膜层的弯曲半径可小于1.2mm。且在该超小的弯曲半径下，该弯折区域仍具有较好的显示效果。从而有效的提高了柔性显示装置的综合性能。
优选的，结合图2-图4，本申请实施例中，该光增强层201的反射率小于5％，且该光增强201的光线透过率大于91％。从而有效的提高该弯折区域处的显示效果。
进一步的，如图6所示，图6为本申请实施例提供的另一柔性显示装置的膜层结构示意图。结合图3中对应的膜层结构示意图，本申请实施例中，该柔性显示装置包括光增强层201以及显示模组20。
其中，该显示模组20内还包括依次设置的第一光学胶层203、吸光层702、柔性面板206、第三光学胶层207、支撑层208、第四光学胶层209，第二缓冲层701以及背板210。
本申请实施例中，该第一光学胶层203、柔性面板206、第三光学胶层207、支撑层208以及第四光学胶层209的膜层设置以及材料与上述膜层结构相同。
同时，该吸光层702可为黑色吸光层，且该吸光层702还可为涂布滤光片，通过将现有显示面板中的偏光片替换成黑色吸光层702以及涂布滤光片以有效的降低面板的厚度，当采用较小厚度的膜层时，弯曲后其对应的弯曲应力会进一步降低，从而有效的提高该弯折区域的弯折性能，并减少弯折区域内折痕的数量，进而提高柔性显示面板在该弯折区域内的显示效果。本申请实施例中，该黑色吸光层702的膜层厚度优选为小于50um。
优选的，本申请实施例中的柔性显示装置还包括第二缓冲层701。如图7所示，图7为本申请实施例提供的另一柔性显示装置的膜层结构示意图。结合图5中的柔性显示装置的结构，本申请实施例中，在设置第二缓冲层701时，该第二缓冲层701可包括泡棉以及热塑性弹性层。
具体的，详见图6，图6中的该第二缓冲层701设置为泡棉，该泡棉结构内部具有多孔性结构。具体的，该泡棉内的多孔结构可为开孔、闭孔或者开孔与闭孔相结合的孔洞结构。具体的多孔结构可根据实际产品的性能及作用进行设置。当柔性显示装置受到外力作用时，如受到弯折或者跌落撞击，其内部的多孔性结构可有效地起到缓冲作用，进而提高该柔性显示装置的性能。
详见图7，图7中的该第二缓冲层701设置为热塑性弹性层，优选的，该热塑性弹性层可为黑色热塑性聚氨酯弹性体。
该黑色热塑性聚氨酯弹性体具有较好的弹性性能，且该热塑性聚氨酯弹性体的厚度较薄，优选为小于40um，从而进一步的降低该膜层的厚度，并减小在弯折时所形成的弯曲应力。
如表1所示，表1为本申请实施例中，第二缓冲层701分别采用上述两种不同的材料制备所形成的显示装置，其他膜层的结构均相同。
表1：不同材料的第二缓冲层所对应的柔性显示装置的性能参数
  厚度 落笔 落球 弯折性 折痕/条
方案1 45um 9cm 3cm 高 6-10
方案2 45um 7cm 2cm 高 3-5
其中，方案1中该第二缓冲层为泡棉，方案2中该第二缓冲层为黑色热塑性聚氨酯弹性体，并分别对其进行弯曲。根据上表各项性能数据可知，两者所形成的柔性显示装置均具有较好的性能。且当该第二缓冲层为黑色热塑性聚氨酯弹性体时，其落笔测试和落球测试的性能均优于泡棉材料。同时，其弯折区域对应的折痕的数量变少，仅有3-5条折痕，从而进一步的提高该弯折区域内的显示效果。
进一步的，在本申请实施例中，该第二缓冲层为黑色热塑性聚氨酯弹性体时，其厚度可进一步减薄，如将第二缓冲层设置为40um，其对应的柔性显示装置仍具有较优良的性能，且厚度更薄。
本申请实施例中，该背板210设置为轻质材料，如易于弯曲的碳纤维材料。优选的，该背板210设置为聚丙烯腈基碳纤维、聚氨酯树脂基碳纤维等材料。且该背板210的厚度设置为小于90um，以在保证显示装置性能的情况下，实现轻薄化设置。
如表2中所示，表2为本申请实施例中提供的背板为不同材料时对应的弯曲应力。
表2:本申请实施例中提供的背板为不同材料时对应的弯曲应力
Figure PCTCN2022104023-appb-000001
本申请实施例中，方案3为采用常规的含铁镍的叠构的背板所制备得到的该显示装置，而方案4为采用本申请实施例中提供的含碳纤维的叠构的背板所制备得到的显示装置。其他共有膜层均为相同的厚 度及材料。
具体的，在方案3中，其装置的弯折半径为1.5mm，在方案4中，其装置的弯折半径为1mm。分别对方案3和方案4中的装置进行弯曲，可知，当弯曲相同的弯曲半径时，采用本申请实施例中提供的背板其所形成的反弹力小于含铁镍的背板。且在不同的弯曲半径下，碳纤维的背板所对应的显示装置具有更好的弯折性能。
优选的，如图8所示，图8为本申请实施例中提供的背板的结构示意图。以下实施例中，该背板210在该弯折区域101内设置为镂空条的结构为例进行说明。多个镂空条901在依次交替的设置在背板210上，且可使得相邻的两镂空条901之间的距离相同，从而保证背板性能的一致性。本申请实施例中，通过在该弯折区域101内设置多个镂空条，当进行弯曲时，镂空条能有效的降低背板的弯曲应力，提高柔性显示装置的弯曲性能。同时，镂空条能进一步降低该背板的重量，进而实现柔性显示装置的轻薄化设计。优选的，该背板210还可设置为其他形状的镂空结构，如多个镂空孔、镂空椭圆等形状，通过设置镂空结构，以有效的降低该弯折区域101内膜层之间的变形应力。
本申请实施例中，在制备该背板时，可将聚丙烯腈基碳纤维经原丝碳化、预浸料、贴合、热压成型、激光切割及覆膜后，最终形成具有纤维结构的背板，当对该背板进行弯折时，纤维结构能够有效的降低反弹力的作用，从而减小该弯折区域内的折痕，并提高其显示效果。
优选的，如图9所示，图9为本申请实施例中提供的柔性显示装置折叠后的结构示意图。该柔性显示装置100折叠后，其体积以及展开面积缩小至原来的一半，且在该弯折区域101处，具有更小的弯曲半径。本申请实施例中，该弯曲半径小于1.2mm，同时，该弯折区域101内对应的膜层上折痕数量较少，当使用者进行观察时，其折痕的可视化程度更低，进而有效的提高了柔性显示装置的显示效果。
本发明实施例中，该柔性显示装置可应用于手机、电脑、笔记本电脑、数码相框等任何具有柔性弯曲或者折叠功能的产品或部件，其具体类型不做具体限制。
综上所述，以上对本发明实施例所提供的一种柔性显示装置进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的技术方案及其核心思想；虽然本发明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发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为基准。

Claims (20)

  1. 一种柔性显示装置，包括：弯折区域以及设置在所述弯折区域至少一侧的平直区域，所述柔性显示装置包括：
    显示模组；以及，
    光增强层，设置于所述显示模组之上，并至少设置在所述弯折区域内；
    其中，所述光增强层包括一硬化层以及设置在所述硬化层上的减反层，所述减反层设置在远离所述显示模组的一侧，且所述硬化层的折射率大于所述减反层的折射率；
    其中，所述硬化层的折射率与所述减反层的折射率之间的差值为0.2。
  2. 根据权利要求1所述的柔性显示装置，其中所述减反层的折射率为1.4-1.75，所述硬化层的折射率为1.8-2.2。
  3. 根据权利要求1所述的柔性显示装置，其中所述硬化层的厚度与所述减反层的膜层厚度均小于500nm。
  4. 根据权利要求1所述的柔性显示装置，其中所述光增强层还包括第一缓冲层，所述第一缓冲层设置在所述显示模组上，所述硬化层设置在所述缓冲层上，所述减反层设置在所述硬化层上。
  5. 根据权利要求4所述的柔性显示装置，其中所述第一缓冲层的厚度小于30um。
  6. 一种柔性显示装置，包括：弯折区域以及设置在所述弯折区域至少一侧的平直区域，所述柔性显示装置包括：
    显示模组；以及，
    光增强层，设置于所述显示模组之上，并至少设置在所述弯折区域内；
    其中，所述光增强层包括一硬化层以及设置在所述硬化层上的减反层，所述减反层设置在所述硬化层远离所述显示模组的一侧，且所述硬化层的折射率大于所述减反层的折射率。
  7. 根据权利要求6所述的柔性显示装置，其中所述减反层的折射率为1.4-1.75，所述硬化层的折射率为1.8-2.2。
  8. 根据权利要求6所述的柔性显示装置，其中所述硬化层的厚度与所述减反层的膜层厚度均小于500nm。
  9. 根据权利要求6所述的柔性显示装置，其中所述光增强层还包括第一缓冲层，所述第一缓冲层设置在所述显示模组上，所述硬化层设置在所述第一缓冲层上。
  10. 根据权利要求9所述的柔性显示装置，其中所述第一缓冲层的厚度小于30um。
  11. 根据权利要求9所述的柔性显示装置，其中所述第一缓冲层的材料包括透明聚酰亚胺以及透明玻璃中的任意一种。
  12. 根据权利要求6所述的柔性显示装置，其中所述光增强层的反射率小于5％，且所述光增强层的光线透过率大于91％。
  13. 根据权利要求6所述的柔性显示装置，其中所述硬化层的材料为聚对苯二甲酸乙二醇酯。
  14. 根据权利要求6所述的柔性显示装置，其中所述显示模组还包括第二缓冲层以及背板，所述第二缓冲层设置在所述背板之上，且所述背板设置在所述显示模组远离所述光增强层的一侧。
  15. 根据权利要求14所述的柔性显示装置，其中所述背板的材料包括聚丙烯腈基碳纤维、聚氨酯树脂基碳纤维中的任意一种。
  16. 根据权利要求14所述的柔性显示装置，其中所述第二缓冲层的材料包括泡棉以及黑色热塑性聚氨酯弹性体中的任意一种。
  17. 根据权利要求14所述的柔性显示装置，其中所述背板在所述弯折区域设置为镂空结构。
  18. 根据权利要求17所述的柔性显示装置，其中所述镂空结构包括镂空网格、镂空条以及镂空孔中的至少一种。
  19. 根据权利要求6所述的柔性显示装置，其中所述显示模组还包括吸光层，所述吸光层设置在所述显示模组靠近所述光增强层的一侧。
  20. 根据权利要求1所述的柔性显示装置，所述柔性显示装置还包括
    背板；
    支撑层，所述支撑层设置于所述背板之上；
    柔性面板，所述柔性面板设置与所述支撑层之上；
    偏光片，所述偏光片设置与所述柔性面板之上，所述光增强层设置于所述偏光片之上；以及，
    设置于各膜层之间的光学胶层。
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