WO2021017201A1 - 柔性偏光盖板及其制备方法、柔性显示装置 - Google Patents

柔性偏光盖板及其制备方法、柔性显示装置 Download PDF

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Publication number
WO2021017201A1
WO2021017201A1 PCT/CN2019/112565 CN2019112565W WO2021017201A1 WO 2021017201 A1 WO2021017201 A1 WO 2021017201A1 CN 2019112565 W CN2019112565 W CN 2019112565W WO 2021017201 A1 WO2021017201 A1 WO 2021017201A1
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WO
WIPO (PCT)
Prior art keywords
layer
polarizing
flexible
cover plate
bending area
Prior art date
Application number
PCT/CN2019/112565
Other languages
English (en)
French (fr)
Inventor
朱超
Original Assignee
武汉华星光电半导体显示技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US16/634,151 priority Critical patent/US20210373219A1/en
Publication of WO2021017201A1 publication Critical patent/WO2021017201A1/zh

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Classifications

    • 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
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133305—Flexible substrates, e.g. plastics, organic film
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133311—Environmental protection, e.g. against dust or humidity

Definitions

  • This application relates to the field of optical technology, and in particular to a flexible polarizing cover plate, a preparation method thereof, and a flexible display device.
  • the foldable feature of the polarizer has put forward higher requirements, not only to ensure the flexibility of the polarizer, but also to ensure the surface hardness.
  • the polarizer and the protective cover are independently attached to the display screen of the flexible display device to form a complete touch display device.
  • the strength in the non-bending area is low, and the protective cover needs to be pasted with optical transparent glue. Combined on the surface of the polarizer, this increases the thickness of the touch display device, which is not conducive to the bending characteristics of the flexible display device.
  • the purpose of this application is to provide a flexible polarizing cover plate, a preparation method thereof, and a flexible display device, which can solve the problem that the polarizer in the prior art has low strength in the non-bending area, and the protective cover plate is attached to the surface of the polarizer.
  • the technical problem of increasing the thickness of the flexible display device is to provide a flexible polarizing cover plate, a preparation method thereof, and a flexible display device, which can solve the problem that the polarizer in the prior art has low strength in the non-bending area, and the protective cover plate is attached to the surface of the polarizer.
  • a flexible polarizing cover plate which includes a polarizing layer and a cover layer that are arranged in close contact; the flexible polarizing cover plate has a bending area and a non-bending area; the cover plate The layer is provided with a composite film layer at a position corresponding to the bending area, and the cover layer is provided with a hardened film at a position corresponding to the non-bending area; wherein, the composite film layer includes a stress buffer Layer and a water blocking layer on the surface of the stress buffer layer.
  • the thickness of the stress buffer layer is greater than the thickness of the water blocking layer.
  • the material of the stress buffer layer is a transparent material that is resistant to bending.
  • the edge of the composite film layer extends beyond the boundary line between the bending area and the non-bending area to the non-bending area.
  • a plurality of openings are provided on the junction side of the composite film layer, and a plurality of openings are provided on the junction side of the hardened film. Mating convex teeth.
  • the bending area is arranged in the middle or one side of the flexible polarizing cover plate.
  • the polarizing layer includes a first polarizing layer and a second polarizing layer
  • the first polarizing layer includes a liquid crystal layer
  • the second polarizing layer includes a polyvinyl alcohol film.
  • the embodiment of the present application also provides a method for preparing a flexible polarizing cover plate, which includes the following steps:
  • Step 1 Prepare a liquid crystal layer and a polyvinyl alcohol film on the surface of the liquid crystal layer to form a polarizing layer.
  • Step 2 Prepare a hardened film on the surface of the non-bending area of the polarizing layer.
  • Step 3 Prepare a stress buffer layer and a water blocking layer on the surface of the stress buffer layer on the surface of the bending area of the polarizing layer.
  • a flexible display device including: a display panel; a touch layer located above the display panel; a flexible polarizing cover plate located above the touch layer, a flexible polarizing cover plate located Above the touch layer, it includes a polarizing layer and a cover layer that are arranged in close contact; the flexible polarizing cover has a bending area and a non-bending area; the cover layer is located at a position corresponding to the bending area A composite film layer is provided at the position, and the cover plate layer is provided with a hardened film at a position corresponding to the non-bending area; wherein, the composite film layer includes a stress buffer layer and a surface of the stress buffer layer. Water blocking layer.
  • the polarizing layer includes a first polarizing layer and a second polarizing layer, the first polarizing layer includes a liquid crystal layer, and the second polarizing layer includes a polyvinyl alcohol film.
  • the thickness of the first polarizing layer is a quarter of the wavelength of light emitted by the display panel.
  • the polarizer and the cover plate are integrated into a design, which reduces the thickness of the flexible display device and is beneficial to the bending characteristics of the flexible display device.
  • a silicon dioxide protective layer is provided in the non-bending area of the flexible polarizing cover plate.
  • the bending area is equipped with a stress buffer layer and a water blocking layer to achieve flexible bending in the bending area of the polarizer, high-strength protection in the non-bending area, improving the reliability of the flexible polarizing cover, and secondly using inkjet printing and vapor deposition processes , So that the material in the bending area is filled more densely, and the stress is relieved.
  • the flexible polarizing cover plate is also equipped with a liquid crystal layer, which improves the optical characteristics of the flexible polarizing cover plate.
  • FIG. 1 is a schematic structural diagram of a flexible polarizing cover provided by an embodiment of the application
  • FIG. 2 is a schematic diagram of the structure of a cover plate in a flexible polarized cover plate provided by an embodiment of the application;
  • FIG. 3 is a schematic diagram of a structure of a second polarizing layer in a flexible polarizing cover provided by an embodiment of the application;
  • FIG. 4 is a schematic structural diagram of another flexible polarizing cover provided by an embodiment of the application.
  • FIG. 5 is a schematic diagram of another bending structure of a flexible polarizing cover provided by an embodiment of the application.
  • FIG. 6 is a schematic flow chart of a method for preparing a flexible polarizing cover provided by an embodiment of the application
  • FIG. 7 is a schematic structural diagram of a flexible display device provided by an embodiment of the application.
  • the present application addresses the technical problem that the polarizer in the prior art has low strength in the non-bending area and the protective cover is attached to the surface of the polarizer to increase the thickness of the flexible display device. This embodiment can solve this defect.
  • the present application provides a flexible polarizing cover plate, including a polarizing layer and a cover plate layer that are arranged in close contact; wherein the flexible polarizing cover plate has a bending area and a non-bending area; the cover plate layer is on a position corresponding to the bending area A composite film layer is provided, and the cover plate layer is provided with a hardened film at a position corresponding to the non-bending area. Both the composite film layer and the hardened film are located on the surface of the polarizing layer; the composite film layer includes a stress buffer layer and a resistance on the surface of the stress buffer layer. Water layer.
  • the present application provides a flexible polarizing cover plate 100, including a polarizing layer 103 and a cover plate layer 106.
  • the flexible polarizing cover plate 100 has a bending area 101 and a non-bending area 102.
  • the central non-bending area 102 includes a first non-bending area 1021 and a second non-bending area 1022, and the bending area 101 is located between the first non-bending area 1021 and the second non-bending area 1022.
  • the cover layer 106 includes a composite film layer 105 and a hardened film 104 connected to each other; the composite film layer 105 includes a stress buffer layer 1051 and a water blocking layer 1052 on the surface of the stress buffer layer 1051.
  • the composite film layer 105 is arranged in the bending area 101
  • the hardened film 104 includes a first hardened film 1041 and a second hardened film 1042.
  • the first hardened film 1041 and the second hardened film 1042 are respectively disposed in the first non-bending area 1021 and the second non-bending area 1022.
  • the materials of the first hardened film 1041 and the second hardened film 1042 include silicon dioxide, which is used to realize the higher strength of the flexible polarizing cover 100 on the first hardened film 1041 and the second hardened film 1042, and better protect the polarizing layer 103 .
  • the cover layer 106 is provided with a stress buffer layer 1051 at the position corresponding to the bending area 101, and a water blocking layer 1052 is provided on the surface of the stress buffer layer 1051.
  • the thickness of the stress buffer layer 1051 is greater than the thickness of the water blocking layer 1052, which is beneficial to bending Flexible bending of area 101.
  • the material of the stress buffer layer 1051 is an anti-bending transparent organic material, including one or one of acrylic, hexamethyl simethicone, polyacrylate, polycarbonate, polyimide, and polystyrene
  • the above composite materials are used to buffer the stress of the flexible display device when bending or folding, and reduce the damage to the flexible polarizing cover plate caused by excessive stress.
  • the material of the water blocking layer 1052 is one or a combination of one or more of Al2O3, TiO2, SiNx, SiCNx, SiOx and SiO2, thereby protecting the flexible touch layer and the polarizing layer from water vapor erosion, thereby extending the display of the flexible display device life.
  • this embodiment provides a schematic diagram of the structure of a cover plate in a flexible polarizing cover plate; in order to better connect the hardened film 104 and the composite film layer 105, the edge of the composite film layer 105 exceeds the bending area 101 and The boundary line of the first non-bending area 1021 extends into the first non-bending area 1021 and is connected to the first hardened film 1041. The other side edge exceeds the boundary between the bending area 101 and the second non-bending area 1022 The boundary line extends into the second non-bending area 1022 and is connected to the second hardened film 1042.
  • the junction side of the composite film layer 105 is provided with a plurality of openings
  • the junction side of the hardened film 104 is provided with a plurality of protruding teeth corresponding to the openings one by one and fitted.
  • the polarizing layer 103 modulates the polarization state of the light emitted by the display panel, so that the light transmitted through different positions of the polarizing layer 103 has a specific polarization state that is different from each other, so as to realize a three-dimensional display of the light.
  • the polarizing layer 103 includes a first polarizing layer 1031 and a second polarizing layer 1032.
  • the first polarizing layer 1031 is a liquid crystal layer
  • the second polarizing layer 1032 includes a polyvinyl alcohol film.
  • the second polarizing layer 1032 is located in the first polarizing layer. 1031 above.
  • the liquid crystal cells 10311 in the first polarizing layer 1031 are neatly arranged at a preset tilt angle, and each liquid crystal cell 10311 can be used as an independent optical switch, and can selectively pass the light emitted by the display panel to convert the light emitted by the light source into a plane matrix light source At the same time, the light passing through the liquid crystal layer will be deflected to realize the exit at a preset angle, resulting in a phase retardation, and obtaining light with the same polarization normal transition characteristics of the quarter-wave plate, while preventing light from entering the second polarizing layer 1032.
  • the function of reflection is the function of reflection.
  • the second polarizing layer 1032 includes a release film 10321, a pressure-sensitive adhesive layer 10322, and a polyvinyl alcohol film 10324 that are stacked in sequence; the pressure-sensitive adhesive layer 10322 is disposed on the release film 10321, The alcohol film 10324 is provided on the pressure-sensitive adhesive layer 10322. Both sides of the polyvinyl alcohol film 10324 are respectively provided with a first triacetyl cellulose layer 10323 and a second triacetyl cellulose layer 10325. Among them, the polyvinyl alcohol film 10324 plays the role of polarization, and the polyvinyl alcohol film 10324 is easily hydrolyzed.
  • the pressure-sensitive adhesive layer 10322 is a high-temperature and moisture-proof pressure-sensitive adhesive, and the polyvinyl alcohol film 10324 is subjected to special dipping treatment.
  • the second polarizing layer made is the wide temperature type polarizing layer; the pressure-sensitive adhesive in use
  • the layer 10322 can be made into an anti-ultraviolet polarizing layer by adding a component that prevents the passage of ultraviolet rays; a birefringent optical compensation film is compounded on the original transmission film to make a polarizing layer with a twist angle of 90° ⁇ 270°; The original film is combined with a light turning film to form a wide viewing angle polarizing layer or a narrow viewing angle polarizing layer.
  • the planar matrix light source passes through the second polarizing layer 1032, is deflected at a preset angle, and then is projected on the screen for display.
  • the light with the same polarization characteristics as the 1/2 wave plate or the quarter wave plate is obtained, so as to realize the three-dimensional display of the display device.
  • the present application provides another flexible polarizing cover 200, including a polarizing layer 203 and a cover layer 206.
  • the flexible polarizing cover 200 has a bending area 201 and a third non-bending area 202.
  • the bending area 201 is located at the edge of the third non-bending area 202, and the third non-bending area 202 can rotate around the contact surface of the bending area 201.
  • the polarizing layer 203 includes a first polarizing layer 2031 and a second polarizing layer 2032.
  • the first polarizing layer 2031 includes a liquid crystal layer.
  • a plurality of liquid crystal cells 20311 are arrayed in the liquid crystal layer.
  • the second polarizing layer 2032 includes a polyvinyl alcohol film. .
  • the cover layer 206 is provided with a composite film layer 205 at a position corresponding to the bending area 201, and the cover layer 206 is provided with a third hardened film 204 at a position corresponding to the third non-bending area 202, the composite film layer 205 and the hardened
  • the thin films 204 are all located on the surface of the polarizing layer 203; the composite film layer 205 includes a stress buffer layer 2051 and a water blocking layer 2052 located on the surface of the buffer layer 2051.
  • the present application provides another bending schematic diagram of the flexible polarizing cover 200.
  • the thickness of the stress buffer layer 2051 is greater than the thickness of the water blocking layer 2052, which is beneficial to the flexible bending of the bending area 201.
  • the bending radius of the area 201 preferably ranges from 0.01 mm to 0.4 mm.
  • the third non-bending area 202 rotates around the bending area 201.
  • a method for preparing a flexible polarizing cover plate includes the following steps:
  • Step 1 Prepare a liquid crystal layer and a polyvinyl alcohol film on the surface of the liquid crystal layer to form a polarizing layer.
  • Step 2 Prepare a hardened film on the surface of the non-bending area of the polarizing layer.
  • Step 3 Prepare a stress buffer layer and a water blocking layer on the surface of the stress buffer layer on the surface of the bending area of the polarizing layer.
  • step 2 also includes:
  • step 3 also includes:
  • a flexible display device 300 including: a display panel 301 including a flexible substrate 3011, a driving circuit layer 3012, a functional layer 3013, and a thin film packaging layer 3014.
  • the flexible substrate 3011 includes a first organic layer and an inorganic layer laminated in sequence; among them, the first organic layer is a whole-surface film, the inorganic layer is a patterned structure, and the whole-surface film refers to a uniform and seamless whole Film, the patterned structure can be a spaced uneven structure, in other words, there are gaps in the inorganic layer, which can release bending stress when deformed due to bending, so that the stress on the inorganic layer is reduced, thereby avoiding it It is broken or peeled from the first organic layer to enhance the bendability of the flexible substrate and prolong the service life of the flexible substrate.
  • the driving circuit layer 3012 located on the surface of the flexible substrate 3011, includes a buffer layer, a driving layer and an ITO layer stacked from top to bottom; the buffer layer is formed on the surface of the flexible substrate 3011, and the driving layer is formed on the surface of the buffer layer and includes a plurality of driving films Transistor, the driving thin film transistor includes at least a gate, a gate insulating layer, an active layer, a source and drain layer; the gate insulating layer is formed on the gate layer, the active layer is formed on the gate insulating layer, and the active layer It is insulated from the gate layer, and active drain layers are arranged on both sides of the active layer.
  • the source and drain layers include a source and a drain.
  • the source and drain are electrically connected to the corresponding positions of the active layer; the ITO layer includes The pixel electrode is in electrical contact with the drain of the driving thin film transistor.
  • the functional layer 3013 is located on the surface of the driving circuit layer 3012.
  • the functional layer 3013 is a single-layer device structure, a double-layer device structure, a three-layer device structure or a multi-layer device structure. Taking the three-layer device structure as an example, the functional layer 3013 includes a hole transport layer , Electron transport layer and light emitting layer.
  • the thin-film encapsulation layer 3014 is generally an inorganic/organic/inorganic multilayer film superimposed structure, which is located on the surface of the functional layer 3013 to protect the light-emitting devices in the functional layer 3013 from water vapor erosion, thereby extending the display life of the display panel 301.
  • the flexible touch layer 302 is located above the flexible display panel 301.
  • the flexible polarizing cover 100 located above the touch layer 302, includes a polarizing layer and a cover layer that are arranged in close contact; the flexible polarizing cover has a bending area and a non-bending area; the cover layer is corresponding to The position of the bending area is provided with a composite film layer, and the cover plate layer is provided with a hardened film at a position corresponding to the non-bending area; wherein, the composite film layer includes a stress buffer layer and The water blocking layer on the surface of the stress buffer layer.
  • the polarizing layer includes a first polarizing layer and a second polarizing layer, the first polarizing layer includes a liquid crystal layer, and the second polarizing layer includes a polyvinyl alcohol film.
  • the preferred thickness of the first polarizing layer is a quarter of the wavelength of light emitted by the display panel.
  • the polarizer is integrated with the cover plate, which reduces the thickness of the touch display device, and is beneficial to the bending characteristics of the flexible flexible display panel.
  • the cover plate is designed in three sections, and high High-strength inorganic material silica, with a stress buffer layer and a water blocking layer in the bending area, to achieve flexible bending, while ensuring the strength of the cover, improving the reliability of the flexible flexible polarizing cover, using inkjet printing and vapor deposition
  • the process makes the material filling in the bending area more dense.
  • the process method of this application is simple and can be used in industrial production.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Polarising Elements (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

一种柔性偏光盖板（100）及其制备方法、柔性显示装置（300），偏光片（103）与盖板（106）结为一体，降低了柔性显示装置（300）的厚度，在柔性偏光盖板（100）的非弯折区域（102）设置有二氧化硅保护层（1041,1042），在弯折区（101）设置应力缓冲层（1051）和阻水层（1052），实现偏光片（103）在弯折区（101）柔性弯折，在非弯折区（102）高强度硬化薄膜防护，柔性偏光盖板（100）还增设了液晶层（1031），提高了柔性偏光盖板（100）的光学特性。

Description

柔性偏光盖板及其制备方法、柔性显示装置 技术领域
本申请涉及光学技术领域，尤其涉及一种柔性偏光盖板及其制备方法、柔性显示装置。
 背景技术
随着柔性显示装置的快速发展，偏光片的可折叠特征提出更高的要求，既要保证偏光片的柔性，又要保证表面硬度。
目前偏光片和保护盖板相互独立外贴于柔性显示装置的显示屏上形成完整的触控显示器件，为了实现柔性，在非弯折区强度低，且需要通过光学透明胶将保护盖板贴合在偏光片的表面，这样增加触控显示器件的厚度，不利于柔性显示装置的弯折特性。
因此，需要提出一种柔性偏光盖板，以解决现有技术中偏光片在非弯折区强度较低，且保护盖板贴合在偏光片的表面，增加柔性显示装置厚度的技术问题。
 技术问题
本申请的目的在于提供一种柔性偏光盖板及其制备方法、柔性显示装置，能够解决现有技术中偏光片在非弯折区强度较低，且保护盖板贴合在偏光片的表面，增加柔性显示装置厚度的技术问题。
 技术解决方案
为了解决上述问题，本申请实施例提供一种柔性偏光盖板，包括相贴合设置的偏光层和盖板层；所述柔性偏光盖板具有弯折区和非弯折区；所述盖板层在对应于所述弯折区的位置上设置有复合膜层，所述盖板层在对应于所述非弯折区的位置上设置有硬化薄膜；其中，所述复合膜层包括应力缓冲层以及位于所述应力缓冲层表面的阻水层。
其中，所述应力缓冲层的厚度比所述阻水层的厚度大。
其中，所述应力缓冲层的材料为抗弯折透明材料。
其中，所述复合膜层边缘超过所述弯折区与所述非弯折区的交界线延伸至所述非弯折区内。
其中，所述复合膜层与所述硬化薄膜相邻的边缘中，所述复合膜层的交接边设置多个开口，所述硬化薄膜的交接边设有多个与所述开口一一对应且嵌合的凸齿。
其中，所述弯折区设置在所述柔性偏光盖板的中间或一侧。
其中，所述偏光层包括第一偏光层和第二偏光层，所述第一偏光层包括液晶层，所述第二偏光层包括聚乙烯醇膜。
为了解决上述问题，本申请实施例还提供了一种柔性偏光盖板的制备方法，包括如下步骤：
步骤1、制备液晶层以及所述液晶层表面聚乙烯醇膜，形成偏光层。
步骤2、在所述偏光层的非弯折区的表面制备硬化薄膜。
步骤3、在所述偏光层的弯折区的表面制备应力缓冲层和位于所述应力缓冲层表面的阻水层。
依据本申请的上述目的，还提供一种柔性显示装置，包括：显示面板；触控层，位于所述显示面板上方；柔性偏光盖板，位于所述触控层上方，柔性偏光盖板，位于所述触控层上方，包括相贴合设置的偏光层和盖板层；所述柔性偏光盖板具有弯折区和非弯折区；所述盖板层在对应于所述弯折区的位置上设置有复合膜层，所述盖板层在对应于所述非弯折区的位置上设置有硬化薄膜；其中，所述复合膜层包括应力缓冲层以及位于所述应力缓冲层表面的阻水层。所述偏光层包括第一偏光层和第二偏光层，所述第一偏光层包括液晶层，所述第二偏光层包括聚乙烯醇膜。
其中，所述第一偏光层的厚度为所述显示面板出光波长的四分之一。
 有益效果
本申请中偏光片与盖板结为一体设计，降低了柔性显示装置的厚度，有利于柔性显示装置的弯折特性，在柔性偏光盖板的非弯折区域设置有二氧化硅保护层，在弯折区设置应力缓冲层和阻水层，实现偏光片弯折区柔性弯折，在非弯折区高强度防护，提高了柔性偏光盖板的可靠性，其次利用喷墨打印和气相沉积工艺，使弯折区域材料填补更密实，缓解应力，柔性偏光盖板还增设了液晶层，提高了柔性偏光盖板的光学特性。
 附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，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一种柔性偏光盖板结构示意图；
图2为本申请实施例提供一种柔性偏光盖板中一种盖板结构示意图；
图3为本申请实施例提供一种柔性偏光盖板中第二偏光层结构示意图；
图4为本申请实施例提供另一种柔性偏光盖板结构示意图；
图5为本申请实施例提供另一种柔性偏光盖板弯折结构示意图；
图6为本申请实施例提供提供一种柔性偏光盖板的制备方法流程示意图；
图7为本申请实施例提供一种柔性显示装置结构示意图。
 本发明的实施方式
下面结合附图和实施例，对本申请作进一步的详细描述。特别指出的是，以下实施例仅用于说明本申请，但不对本申请的范围进行限定。同样的，以下实施例仅为本申请的部分实施例而非全部实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
本申请针对现有技术中偏光片在非弯折区强度较低，且保护盖板贴合在偏光片的表面，增加柔性显示装置厚度的技术问题，本实施例能够解决该缺陷。
本申请提供一种柔性偏光盖板，包括相贴合设置的偏光层和盖板层；其中，柔性偏光盖板具有弯折区和非弯折区；盖板层在弯折区对应的位置上设置有复合膜层，盖板层在非弯折区对应的位置上设置有硬化薄膜，复合膜层和硬化薄膜均位于偏光层表面；复合膜层包括应力缓冲层以及位于应力缓冲层表面的阻水层。
如图1所示，具体地，本申请提供一种柔性偏光盖板100，包括偏光层103和盖板层106，柔性偏光盖板100具有弯折区101以及非弯折区102，本实施例中非弯折区102包括第一非弯折区1021和第二非弯折区1022，弯折区101位于第一非弯折区1021和第二非弯折区1022之间。盖板层106包括复合膜层105和相接入的硬化薄膜104；复合膜层105包括应力缓冲层1051以及位于应力缓冲层1051表面的阻水层1052，复合膜层105设置在弯折区101中；硬化薄膜104包括第一硬化薄膜1041和第二硬化薄膜1042，第一硬化薄膜1041和第二硬化薄膜1042分别设置在第一非弯折区1021和第二非弯折区1022中。第一硬化薄膜1041和第二硬化薄膜1042的材料均包括二氧化硅，用于实现柔性偏光盖板100在第一硬化薄膜1041和第二硬化薄膜1042的强度较高，更好保护偏光层103。
盖板层106对应弯折区101位置上设置有应力缓冲层1051，在应力缓冲层1051表面设置有阻水层1052，应力缓冲层1051的厚度要大于阻水层1052的厚度，有利于弯折区101的柔性弯折。
应力缓冲层1051的材料为抗弯折透明有机材料，包括亚克力、六甲基二甲硅醚、聚丙烯酸酯类、聚碳酸脂类、聚酰亚胺、聚苯乙烯的其中一种或一种以上的组合材料，用于缓冲柔性显示装置在弯曲或折叠时的应力，减少应力过大对柔性偏光盖板造成的损害。阻水层1052的材料为Al2O3、TiO2、SiNx、SiCNx、SiOx和SiO2中一种或一种以上的组合材料，进而保护柔性触控层和偏光层免受水汽侵蚀，进而延长柔性显示装置的显示寿命。
如图2所示，本实施例提供一种柔性偏光盖板中一种盖板结构示意图；为了更好衔接硬化薄膜104与复合膜层105，复合膜层105一侧边缘超过弯折区101与第一非弯折区1021的交界线延伸至第一非弯折区1021内，并与第一硬化薄膜1041相接入，另一侧边缘超过弯折区101与第二非弯折区1022的交界线延伸至第二非弯折区1022内，并与第二硬化薄膜1042相接入。其中，复合膜层105与硬化薄膜104相邻的边缘中，复合膜层105的交接边设置多个开口，硬化薄膜104的交接边设有多个与开口一一对应且嵌合的凸齿。
如图1所示，偏光层103对显示面板发出的光进行偏振状态调制，使得经由偏光层103不同位置所透射的光线具有相互区别的特定偏振状态，以实现光线的立体显示。
偏光层103包括第一偏光层1031和第二偏光层1032，第一偏光层1031为液晶层，第二偏光层1032包括聚乙烯醇膜，本实施例中第二偏光层1032位于第一偏光层1031上方。
第一偏光层1031中液晶单元10311以预设倾斜角度整齐排列，每个液晶单元 10311可以单独作为光开关，并选择性地通过显示面板发射的光线，进而将光源发出的光线转变成平面矩阵光源，同时光线经过该液晶层会发生偏转，实现以预设角度出射，产生相位延迟量，获取1/4波片相同的偏正态转变的特性的光线，同时防止光线进入第二偏光层1032发生反射的功能。
如图3所示，第二偏光层1032包括依次层叠设置的离型膜10321、压敏粘接层10322、聚乙烯醇膜10324；压敏粘接层10322设置在离型膜10321上，聚乙烯醇膜10324设置在压敏粘接层10322上。聚乙烯醇膜10324两侧分别设置有第一三醋酸纤维素层10323和第二三醋酸纤维素层10325。其中，聚乙烯醇膜10324起到偏振作用，聚乙烯醇膜10324极易水解，为了保护聚乙烯醇膜10324的偏光物理特性，因此在聚乙烯醇膜10324的两侧各复合一层具有高光透过率、耐水性好、有一定机械强度的三醋酸纤维素层进行防护。压敏粘接层10322为耐高温防潮压敏胶，并对聚乙烯醇膜10324进行特殊浸胶处理，所制成的第二偏光层即为宽温类型偏光层；在使用的压敏粘接层10322中加入阻止紫外线通过的成份，则可制成防紫外线偏光层；在透射原片上再复合上双折射光学补偿膜，则可制成扭曲角为90°~270°的偏光层；在透射原片上再复合上光线转向膜，则可制成宽视角偏光层或窄视角偏光层。平面矩阵光源经过第二偏光层1032，以预设角度发生偏转，然后投射在屏幕上进行显示。
本申请光线经过偏光层103内设置第一偏光层1031及第二偏光层1032后，获取与1/2波片或1/4波片相同的偏光特性的光线，从而实现显示装置的立体显示，不需要再另外设置1/2 波片或 1/4波片，也免除了将1/2波片或1/4波片与可控矩阵光源上的液晶单元精确对位的步骤，降低了生产难度，提高了产品良率，减少了生产成本。
如图4所示，本申请提供另一种柔性偏光盖板200，包括偏光层203和盖板层206，柔性偏光盖板200具有弯折区201以及第三非弯折区202，弯折区201位于第三非弯折区202的边缘，第三非弯折区202可以绕着弯折区201接触面转动。本实施例中偏光层203包括第一偏光层2031和第二偏光层2032，第一偏光层2031包括液晶层，液晶层中阵列设置多个液晶单元20311，第二偏光层2032包括聚乙烯醇膜。盖板层206在弯折区201对应的位置上设置有复合膜层205，盖板层206在第三非弯折区202对应的位置上设置有第三硬化薄膜204，复合膜层205和硬化薄膜204均位于偏光层203表面；复合膜层205包括应力缓冲层2051以及位于缓冲层2051表面的阻水层2052。
如图5所示，本申请提供另一种柔性偏光盖板200的弯折示意图，应力缓冲层2051的厚度要大于阻水层2052的厚度，有利于弯折区201的柔性弯折，弯折区201的弯折半径优选范围为0.01mm至0.4mm，本实施例中第三非弯折区202绕着弯折区201旋转。
如图6所示，依据上述柔性偏光盖板，还提供一种柔性偏光盖板的制备方法，包括如下步骤：
步骤1、制备液晶层以及所述液晶层表面聚乙烯醇膜，形成偏光层。
步骤2、在所述偏光层的非弯折区的表面制备硬化薄膜。
步骤3、在所述偏光层的弯折区的表面制备应力缓冲层和位于所述应力缓冲层表面的阻水层。
优选地，步骤2还包括：
在所述柔性偏光盖板弯折中心两侧各4mm位置开始涂布高强度二氧化硅，形成硬化薄膜，所述硬化薄膜的厚度为8~25μm。
优选地，步骤3还包括：
在所述柔性偏光盖板8mm弯折区域表面喷墨、打印有机透明聚酰亚胺材料，流平、固化填满缝隙，形成应力缓冲层，所述应力缓冲层的厚度为5~22μm。
在所述应力缓冲层表面通过化学气相沉积方式沉积3~10μm无机氮化硅，利用掩膜板进行光刻，图案化形成阻水层。
如图7所示，依据本申请的上述目的，还提供一种柔性显示装置300，包括：显示面板301，包括柔性基板3011、驱动电路层3012、功能层3013、薄膜封装层3014。柔性基板3011包括依序层叠的第一有机层和无机层；其中，第一有机层为整面式膜层，无机层为图案化结构，整面式膜层是指均匀无缝隙的一整张膜，该图案化结构可以是间隔的凹凸结构，也或者说，无机层中存在间隙，其在因弯折产生形变时，可以释放弯折应力，使无机层受到的应力减小，进而避免其被折断或与第一有机层剥离，以增强柔性基板的可弯折性，延长柔性基板的使用寿命。驱动电路层3012，位于柔性基板3011表面，包括上自下而上层叠设置缓冲层、驱动层以及ITO层；缓冲层形成于柔性基板3011表面，驱动层形成于缓冲层表面，包括多个驱动薄膜晶体管，驱动薄膜晶体管至少包括栅极、栅极绝缘层、有源层、源漏极层；栅极绝缘层形成于栅极层上，有源层形成于栅极绝缘层上，且有源层与栅极层绝缘设置，有源层两侧设置有源漏极层，源漏极层包括源极和漏极，源极和漏极分别与有源层相应的位置电性连接；ITO层包括像素电极，像素电极与驱动薄膜晶体管中漏极电性接触。功能层3013位于驱动电路层3012表面，功能层3013为单层器件结构、双层器件结构、三层器件结构或者多层器件结构，以三层器件结构为例，功能层3013包括空穴传输层、电子传输层和发光层。薄膜封装层3014一般为无机/有机/无机的多层膜叠加结构，位于功能层3013表面，保护功能层3013内发光器件免受水汽侵蚀，进而延长显示面板301的显示寿命。
柔性触控层302位于柔性显示面板301上方。
柔性偏光盖板100，位于触控层302上方，包括相贴合设置的偏光层和盖板层；所述柔性偏光盖板具有弯折区和非弯折区；所述盖板层在对应于所述弯折区的位置上设置有复合膜层，所述盖板层在对应于所述非弯折区的位置上设置有硬化薄膜；其中，所述复合膜层包括应力缓冲层以及位于所述应力缓冲层表面的阻水层。偏光层包括第一偏光层和第二偏光层，第一偏光层包括液晶层，第二偏光层包括聚乙烯醇膜。第一偏光层的优选厚度为显示面板出光波长的四分之一。
本申请中偏光片与盖板结为一体，降低了触控显示器件的厚度，有利于柔性柔性显示面板的弯折特性，将盖板设计三段式，在非弯折区域两侧设置有高强度无机材料二氧化硅，在弯折区设置应力缓冲层和阻水层，实现柔性弯折，同时保证盖板的强度，提高了柔性柔性偏光盖板的可靠性，利用喷墨打印和气相沉积工艺，使弯折区域材料填补更密实，本申请工艺方法简单，可用于工业生产。
综上，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 (10)

  1. 一种柔性偏光盖板，其包括相贴合设置的偏光层和盖板层；所述柔性偏光盖板具有弯折区和非弯折区；所述盖板层在对应于所述弯折区的位置上设置有复合膜层，所述盖板层在对应于所述非弯折区的位置上设置有硬化薄膜；其中，所述复合膜层包括应力缓冲层以及位于所述应力缓冲层表面的阻水层。
  2. 根据权利要求1所述的柔性偏光盖板，其中，所述应力缓冲层的厚度比所述阻水层的厚度大。
  3. 根据权利要求1所述的柔性偏光盖板，其中，所述应力缓冲层的材料为抗弯折透明材料。
  4. 根据权利要求1所述的柔性偏光盖板，其中，所述复合膜层边缘超过所述弯折区与所述非弯折区的交界线延伸至所述非弯折区内。
  5. 根据权利要求4所述的柔性偏光盖板，其中，所述复合膜层与所述硬化薄膜相邻的边缘中，所述复合膜层的交接边设置多个开口，所述硬化薄膜的交接边设有多个与所述开口一一对应且嵌合的凸齿。
  6. 根据权利要求1所述的柔性偏光盖板，其中，所述弯折区设置在所述柔性偏光盖板的中间或一侧。
  7. 根据权利要求1所述的柔性偏光盖板，其中，所述偏光层包括第一偏光层和第二偏光层，所述第一偏光层包括液晶层，所述第二偏光层包括聚乙烯醇膜。
  8. 一种柔性偏光盖板的制备方法，其包括如下步骤：
    步骤1、制备液晶层以及所述液晶层表面聚乙烯醇膜，形成偏光层；
    步骤2、在所述偏光层的非弯折区的表面制备硬化薄膜；
    步骤3、在所述偏光层的弯折区的表面制备应力缓冲层和位于所述应力缓冲层表面的阻水层。
  9. 一种柔性显示装置，其包括：
    显示面板；
    触控层，位于所述显示面板上方；
    柔性偏光盖板，位于所述触控层上方，包括相贴合设置的偏光层和盖板层；所述柔性偏光盖板具有弯折区和非弯折区；所述盖板层在对应于所述弯折区的位置上设置有复合膜层，所述盖板层在对应于所述非弯折区的位置上设置有硬化薄膜；其中，所述复合膜层包括应力缓冲层以及位于所述应力缓冲层表面的阻水层。所述偏光层包括第一偏光层和第二偏光层，所述第一偏光层包括液晶层，所述第二偏光层包括聚乙烯醇膜。
  10. 根据权利要求9所述的柔性显示装置，其中，所述第一偏光层的厚度为所述显示面板出光波长的四分之一。
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