WO2019071780A1 - 偏光板及其制作方法、曲面显示面板 - Google Patents

偏光板及其制作方法、曲面显示面板 Download PDF

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Publication number
WO2019071780A1
WO2019071780A1 PCT/CN2017/115262 CN2017115262W WO2019071780A1 WO 2019071780 A1 WO2019071780 A1 WO 2019071780A1 CN 2017115262 W CN2017115262 W CN 2017115262W WO 2019071780 A1 WO2019071780 A1 WO 2019071780A1
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Prior art keywords
polarizing
display panel
layer
light
different
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PCT/CN2017/115262
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English (en)
French (fr)
Inventor
单剑锋
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惠科股份有限公司
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Priority to US16/307,646 priority Critical patent/US11294112B2/en
Publication of WO2019071780A1 publication Critical patent/WO2019071780A1/zh

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    • 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
    • G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00634—Production of filters
    • B29D11/00644—Production of filters polarizing
    • 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
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising 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
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/56—Substrates having a particular shape, e.g. non-rectangular

Definitions

  • the present application relates to the field of display technologies, and in particular, to a polarizing plate, a manufacturing method thereof, and a curved display panel.
  • the traditional flat display panel has gradually moved toward the curved display panel.
  • the curved display panel has the characteristics of large viewing angle and beautiful appearance, and is more and more popular among the public.
  • the polarizing plate design of the flat display panel is still used in the conventional curved display panel, and the problem of narrow viewing angle exists in actual use.
  • a method for fabricating a polarizing plate comprising: providing a polarizing layer, wherein the polarizing layer comprises a plurality of curved surface regions having different curvatures, wherein the curvature of each curved surface region is greater than or equal to 2000R; and stretching the partial curved surface region to adjust the The direction of the polarizing alignment axis of the stretched curved surface region and the corresponding viewing angle, the stretching process is such that the angle of the polarizing alignment axis with respect to before stretching is 0 to 180 degrees.
  • a polarizing plate comprising: a polarizing layer comprising a front viewing zone and at least one auxiliary viewing zone, the auxiliary viewing zone being connected to at least one side of the main viewing zone, the curvature of the auxiliary viewing zone and the main viewing zone The curvatures of the regions are not equal, the curvatures of the auxiliary vision zone and the main viewing zone are both greater than or equal to 2000R, and the auxiliary vision zone has a polarization alignment axis direction different from the main viewing zone to adjust the viewing angle of the auxiliary viewing zone.
  • the polarizing alignment axis of the auxiliary viewing zone and the polarizing alignment axis of the main viewing zone are at an angle of 0 to 180 degrees; and a protective layer is disposed on at least one side of the polarizing layer for connecting the polarizing layer to the outside And an adhesive layer disposed on a side of the protective layer relative to the polarizing layer for bonding the polarizing plate to the curved display panel.
  • a curved display panel comprising: a first polarizing plate; and a second polarizing plate, wherein the first polarizing plate and the second polarizing plate are the polarizing plates;
  • the curved display panel comprises a front view area and at least one auxiliary view area
  • the auxiliary view area of the curved display panel is connected to at least one side of the front view area of the curved display panel, and the curvature of the auxiliary view area of the curved display panel is greater than the curvature of the main view area of the curved display panel.
  • An angle formed by the light exiting surface of the front view area of the curved display panel and the light exiting surface of the auxiliary view area of the curved display panel is greater than 90 degrees and less than 180 degrees.
  • the auxiliary viewing zone has a polarization alignment axis direction different from the main viewing zone to adjust the viewing angle of the auxiliary viewing zone, so that the polarizing layer has different axes according to the position/curvature in the curved display panel.
  • the polarizing plate as a whole has multi-axial polarization, which satisfies the wide viewing angle requirement of the curved display panel.
  • the partial curved surface region of the polarizing layer is stretched to adjust the direction of the polarization alignment axis of the stretched curved surface region and the corresponding viewing angle, so that the polarizing layer is in the curved display panel according to the method.
  • the position/curvature has different axial polarization, and the polarizing plate has multi-axial polarization as a whole, which satisfies the wide viewing angle requirement of the curved display panel.
  • FIG. 1 is a flow chart showing a method of fabricating a polarizing plate in an embodiment
  • FIG. 2 is a flow chart of the sub-steps of step S101;
  • FIG. 3 is a schematic structural view of a polarizing layer in an embodiment
  • FIG. 4 is a schematic structural view of a polarizing plate in an embodiment.
  • the conventional curved display panel uses a uniaxially polarized curved polarizer. Therefore, the curved surface angle is narrower than the planar viewing angle. Therefore, it is necessary to provide a method for fabricating a polarizing plate that satisfies the wide viewing angle requirements of a curved display panel.
  • the polarizing plate mainly processes the polarizing layer to make the polarizing layer have multiaxial polarization.
  • FIG. 1 is a flow chart of a method for fabricating a polarizing plate in an embodiment, including:
  • the polarizing layer of the polarizing plate only allows light having a specific vibration direction in the light to pass, and absorbs light in other vibration directions, thereby converting the non-polarizing light into polarized light.
  • a liquid crystal display uses a polarizing plate to convert light emitted by a backlight module into polarized light, and utilizes the torsional characteristics of liquid crystal molecules to adjust the passing light.
  • the polarizing plate in this embodiment is suitable for a curved display panel, so the polarizing layer includes a plurality of curved surface regions having different curvatures.
  • the polarizing layer includes a front viewing zone coupled to at least one side of the primary viewing zone and at least one secondary viewing zone, the curvature of the secondary viewing zone being unequal to the curvature of the primary viewing zone.
  • the polarizing layer includes a main viewing zone 310, a secondary viewing zone 321 connected to one side of the primary viewing zone 310, and a secondary viewing zone 323 connected to the other side of the primary viewing zone 310.
  • S103 Perform at least part of the curved surface region to adjust the direction of the polarization alignment axis of the stretched curved surface region and the corresponding viewing angle.
  • the stretching process may stretch different curved surface regions of the polarizing layer by different stretching strengths or stretch different curved surface regions of the polarizing layer with different stretching directions, so that different curved regions of the polarizing layer have different polarized lights.
  • the polarization alignment axis that is, the transmission axis of the polarizing layer.
  • the partial curved surface region of the polarizing layer is stretched to adjust the direction of the polarization alignment axis of the stretched curved surface region and the corresponding viewing angle, so that the polarizing layer is in the curved display panel according to the method.
  • the position/curvature has different axial polarization, and the polarizing plate has multi-axial polarization as a whole, which satisfies the wide viewing angle requirement of the curved display panel.
  • step S101 specifically includes:
  • the material of the base film of the polarizing layer is a polyvinyl alcohol film (Poly Vinyl Alcohol, PVA).
  • Step S103 causes the first ion to form an ion or a long chain of molecules which is directional and absorbs light in its own direction by stretching.
  • the ions contained in the solution used in the dyeing process are polarized to light as a single ion.
  • the solution may be an iodide solution (I 2 /KI aqueous solution).
  • the base film of the polarizing layer is placed in the iodide ion solution, and the iodide ion is diffused and adsorbed in the base film of the polarizing layer to form a complex, and then the stretching action in the step S103 causes the iodide ion attached to the PVA to have a directionality to form iodine. Long ion chain.
  • the solution may also be a bromide solution or the like.
  • the solution used in the dyeing process is a mixed solution comprising at least two ions that are polarized for light.
  • the mixed solution may be a mixed solution of iodide ions and bromide ions.
  • the base film of the polarizing layer is placed in a mixed solution of iodide ions and bromide ions, and the iodide ions and the bromide ions are diffused and adsorbed in the base film of the polarizing layer to form different complexes. Iodine ions and bromide ions have different polarization directions, so the polarizing layer base film has multiaxial polarization.
  • ions contained in the solution used in the dyeing process that are polarized to light may have different ionic states.
  • the ions in the solution may be I 3- ions or I 5- ions, and may also contain I 3- ions and I 5- ions.
  • the dyeing process may treat different curved surface regions of the polarizing layer with different solutions, so that different curved regions of the polarizing layer have different axial polarizations, thereby achieving multi-axial polarization of the polarizing layer.
  • the main viewing area 310 may be dyed with a solution of the first ions polarized to the light, and the auxiliary viewing area 321 and the auxiliary viewing area 323 may be polarized.
  • the solution of the second ion is subjected to a dyeing treatment.
  • the main viewing zone 310 is dyed by using an iodide solution, and the auxiliary viewing zone 321 and the auxiliary viewing zone 323 are dyed by using a bromide ion solution, that is, the second ion is polarized to the light.
  • the chemical element is an element different from the chemical element in the first ion which is polarized to light.
  • the main viewing zone 310 is dyed using an iodide solution, and the auxiliary viewing zone 321 and the auxiliary viewing zone 323 are dyed using a mixed solution of an iodide ion and a bromide ion solution. It can be understood that the actual processing includes but is not limited to the above embodiments.
  • different curved surface regions of the polarizing layer base film may also be treated with a solution having different ionic states of ions having polarization to light, so that different curved regions of the polarizing layer base film have different ions.
  • a solution having different ionic states of ions having polarization to light so that different curved regions of the polarizing layer base film have different ions.
  • the base film of the polarizing layer has a multiaxial polarization state.
  • the main viewing zone 310 of the base film of the polarizing layer is dyed by an I3 - ion solution
  • the auxiliary region 321 and the auxiliary viewing zone 323 of the polarizing layer are dyed by using an I 5- ion solution to make the polarizing layer base film.
  • the direction of the polarization alignment axis of the main viewing zone 310 and the auxiliary viewing zone 321 and the auxiliary viewing zone 323 are different, that is, the chemical element of the second ion that is polarized to the light is polarized to the first ion.
  • the I3 - ion solution may be dyed in the main viewing zone 310 of the base film of the polarizing layer, and the I3 - ion and I5-1 ions may be co-existed in the auxiliary-viewing region 321 and the auxiliary-viewing region 323.
  • the mixed solution is subjected to dyeing treatment.
  • step S103 stretches different curved regions of the polarizing layer or stretches in different directions, so that ions having polarizing properties in the corresponding regions have different directivity. That is, different regions of the polarizing layer have different polarization alignment axis directions.
  • the ion having a polarizing property to light is an iodide ion. Iodine ion adsorption in polarized light In the layer, it is stretched to form a long chain of iodide ions.
  • the polarizing layer is stretched in different directions or stretched at different strengths to form different long chains of iodide ions on the polarizing layer, so that the polarizing layers have different polarization alignment axes.
  • different stretching regions and stretching directions may be simultaneously used to stretch different curved regions.
  • step S103 The surface area of the display panel is reduced in adhesion due to bending and stretching, and reliability problems are likely to occur for a long time.
  • step S103 the following steps are further included:
  • the polarizing layer is fixed to the bonding layer, and the material of the bonding layer includes a heat sensitive substance whose viscosity is increased after heating.
  • the polarizing plate is bonded to the curved display panel through the bonding layer, and then the bonding layer is subjected to heat treatment. Even if the heat sensitive substance returns to room temperature after heating, the viscosity does not fall until before heating, so that the viscosity of the heated portion of the adhesive layer can be increased, so that the adhesive layer has good adhesion, and the curved display panels are improved. Part of the reliability.
  • heating the bonding layer is to heat a portion (curved surface region) where the bonding layer has a large curvature.
  • a curvature threshold can be set to heat a portion larger than the curvature threshold.
  • the polarizing plate includes a protective layer 410, a protective layer 420, a polarizing layer 430, a protective layer 440, an adhesive layer 450, and a separation layer 460.
  • the protective layer 410 is a surface protective layer of the polarizing plate for protecting the polarizing layer 430.
  • the protective layer 410 may be a polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • the protective layer 420 and the protective layer 440 are respectively located on both sides of the polarizing layer 430, which can increase the support protection of the polarizing layer 430, thereby increasing the mechanical properties of the polarizing plate.
  • the protective layer 420 and the protective layer 440 can protect the polarizing layer base film of the polarizing layer 430 on the one hand, and can prevent the retracting of the polarizing layer base film of the polarizing layer 430 on the other hand.
  • the protective layer 420 and the protective layer 440 may be a Triacetate Cellulose (TAC).
  • TAC Triacetate Cellulose
  • the polarizing layer 430 serves as a polarizing substrate of the polarizing plate to filter the light transmitted through the polarizing plate.
  • the polarizing layer 430 is a polarizing layer having different polarization alignment axes in different regions, and the polarizing layer 430 is formed by using the polarizing plate described in any of the above embodiments.
  • the polarizing layer 430 may be polyvinyl alcohol (Poly Vinyl Alcohol, PVA).
  • the bonding layer 450 is used for bonding the polarizing plate to the curved display panel. When the polarizing plate is bonded to the curved display panel, the bonding layer 450 of the polarizing plate is adsorbed and bonded to the glass of the curved display panel.
  • the bonding layer 450 can be a pressure sensitive adhesive (PSV) layer.
  • PSV pressure sensitive adhesive
  • the main component of the pressure sensitive adhesive is a polypropylene-based adhesive, which has less flexibility.
  • a heat sensitive substance is added to the pressure sensitive adhesive. After the polarizing plate is bonded to the curved display panel, the curved surface position of the curved display panel is heated. Since the adhesive layer 450 of the heating portion has a heat sensitive substance, the viscosity of the heated portion is increased, so that the curved portion of the curved display panel has good adhesion. That is to improve the reliability of each part of the curved display panel.
  • the separation layer 460 is used to protect the bonding layer 450.
  • the separation layer 460 may be a polyethylene terephthalate (PET).
  • the angle formed by the light exiting surface of the main viewing zone 310 and the light emitting surface of the auxiliary viewing zone 321 at the junction is greater than 90 degrees and less than 180 degrees, and is formed at the junction with the light exiting surface of the auxiliary viewing zone 323.
  • the angle is greater than 90 degrees and less than 180 degrees.
  • the application also provides a curved display panel.
  • the curved display panel includes a first polarizing plate, a color filter substrate, a liquid crystal layer, a thin film transistor array substrate, a second polarizing plate, and a backlight module.
  • the first polarizing plate, the color filter substrate, the thin film transistor array substrate, the second polarizing plate and the backlight module are superimposed and integrated.
  • the liquid crystal layer is disposed between the color filter substrate and the thin film transistor array substrate.
  • the backlight module is configured to provide a light source to the whole of the first polarizing plate, the color filter substrate, the liquid crystal layer, the thin film transistor array substrate and the second polarizing plate.
  • the first polarizing plate and the second polarizing plate are both the polarizing plates described in any one of the above embodiments, that is, the first polarizing plate and the second polarizing plate are fabricated by using the method for manufacturing the polarizing plate according to any of the above embodiments.
  • the curved display panel comprises a front view area and at least one auxiliary view area, wherein the auxiliary view area of the curved display panel is connected to at least one side of the main view area of the curved display panel, and the curvature of the auxiliary view area of the curved display panel is larger than the main surface of the curved display panel
  • the curvature of the viewing zone, the light exiting surface of the main viewing zone of the curved display panel and the light exiting surface of the auxiliary viewing zone of the curved display panel are formed at an angle greater than 90 degrees and less than 180 degrees.
  • the curved display panel may be an LCD curved display panel, an OLED curved display panel, a QLED curved display panel, or other curved display panels.
  • the specific type of the curved display panel is not particularly limited.
  • the display device is, for example, an LCD (Liquid Crystal Display) display device, an OLED (Organic Light-Emitting Diode) display device, a QLED (Quantum Dot Light Emitting Diodes) display device, a curved display device, or other display device.
  • LCD Liquid Crystal Display
  • OLED Organic Light-Emitting Diode
  • QLED Quadantum Dot Light Emitting Diodes

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  • General Physics & Mathematics (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
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  • Engineering & Computer Science (AREA)
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  • Manufacturing & Machinery (AREA)
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  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

一种偏光板的制作方法，包括：提供偏光层（430），该偏光层（430）包括多个曲率不相同的曲面区域（S101）；以及对至少部分曲面区域进行拉伸处理，以调整被拉伸的曲面区域的偏光配向轴方向及相应的可视角度(S103)。还提供了一种偏光板及包括该偏光板的曲面显示面板。采用该偏光板可提升曲面显示面板的视角。

Description

偏光板及其制作方法、曲面显示面板
相关申请的交叉引用
本申请要求于2017年10月10日提交中国专利局、申请号为2017109370440、申请名称为“偏光板及其制作方法、曲面显示面板”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示技术领域，特别是涉及一种偏光板及其制作方法、曲面显示面板。
背景技术
随着时代的需求，传统的平面式显示面板已经逐渐走向曲面显示面板。相较于平面显示面板，曲面显示面板具有视角大、造型美观等特点，越来越受到大众的欢迎。然而，传统的曲面显示面板内仍沿用平面显示面板的偏光板设计，实际使用中存在可视角度较窄的问题。
发明内容
基于此，有必要提供一种能够满足曲面显示面板的广视角需求的偏光板及其制作方法、曲面显示面板。
一种偏光板的制作方法，包括：提供偏光层，所述偏光层包括多个曲率不相同的曲面区域，各曲面区域的曲率大于等于2000R；以及对部分曲面区域进行拉伸处理，以调整被拉伸的曲面区域的偏光配向轴方向及相应的可视角度，所述拉伸处理使得所述偏光配向轴相对于拉伸前的夹角为0度～180度。
一种偏光板，包括：偏光层，包括主视区和至少一个辅视区，所述辅视区连接在所述主视区的至少一侧，所述辅视区的曲率与所述主视区的曲率不相等，所述辅视区和主视区的曲率均大于等于2000R，所述辅视区具有与主视区不同的偏光配向轴方向以调整所述辅视区的可视角度，所述辅视区的偏光配向轴与主视区的偏光配向轴夹角为0度～180度；保护层，设置在所述偏光层的至少一侧，用于将所述偏光层的与外界环境隔离；以及粘接层，设于所述保护层相对于所述偏光层的一侧，用于将所述偏光板粘接在曲面显示面板上。
一种曲面显示面板，包括：第一偏光板；及第二偏光板，所述第一偏光板和第二偏光板为上述偏光板；所述曲面显示面板包括主视区和至少一个辅视区，所述曲面显示面板的辅视区连接在所述曲面显示面板的主视区的至少一侧，所述曲面显示面板的辅视区的曲率大于所述曲面显示面板的主视区的曲率，所述曲面显示面板的主视区的出光面与所述曲面显示面板的辅视区的出光面在连接处形成的角度大于90度小于180度。上述偏光板及曲面显示面板，辅视区具有与主视区不同的偏光配向轴方向以调整辅视区的可视角度，使得偏光层根据其在曲面显示面板中的位置/曲率具有不同的轴向偏振性，偏光板整体上具有多轴向偏振性，满足了曲面显示面板的广视角需求。
上述偏光板的制作方法，对偏光层的部分曲面区域进行拉伸处理，以调整被拉伸的曲面区域的偏光配向轴方向及相应的可视角度，使得偏光层根据其在曲面显示面板中的位置/曲率具有不同的轴向偏振性，偏光板整体上具有多轴向偏振性，满足了曲面显示面板的广视角需求。
附图说明
为了更清楚地说明本申请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实施例的附图。
图1为一实施例中的偏光板的制作方法的流程图；
图2为步骤S101的子步骤的流程图；
图3为一实施例中的偏光层的结构示意图；
图4为一实施例中偏光板的结构示意图。
具体实施方式
为了便于理解本申请，下面将参照相关附图对本申请进行更全面的描述。附图中给出了本申请的较佳实施例。但是，本申请可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本申请的公开内容的理解更加透彻全面。
传统的曲面显示面板采用的是单轴向偏振性的曲面偏光板。因此曲面视角相对于平面视角较窄。故有必要提供一种满足曲面显示面板的广视角需求的偏光板的制作方法。该偏光板主要是对偏光层进行处理以使得偏光层具有多轴向偏振性。
图1为一实施例中的偏光板的制作方法的流程图，包括：
S101，提供偏光层。
偏光板的偏光层的作用只允许光线中具有特定振动方向的光通过，而将其他振动方向的光线吸收，从而将不具偏振性的光线转化成偏振光。液晶显示器(Liquid Crystal Display，LCD)利用偏光板将背光模组发出的光转化成偏振光，并利用液晶分子的扭转特性，以调节通过的光线。本实施例中的偏光板适用于曲面显示面板，故偏光层包括多个曲率不相同的曲面区域。在一个实施例中，偏光层包括主视区和至少一个辅视区，辅视区连接在主视区的至少一侧，辅视区的曲率与主视区的曲率不相等。
在图3所示的实施例中，偏光层包括主视区310、与主视区310的一侧连接的辅视区321、与主视区310的另一侧连接的辅视区323。
S103，对至少部分曲面区域进行拉伸处理，以调整被拉伸的曲面区域的偏光配向轴方向及相应的可视角度。
拉伸处理可以采用不同的拉伸力度对偏光层的不同曲面区域进行拉伸或者采用不同的拉伸方向对偏光层的不同曲面区域进行拉伸，以使得偏光层的不同曲面区域具有不同的偏光配向轴方向。偏光配向轴即偏光层的透光轴。
上述偏光板的制作方法，对偏光层的部分曲面区域进行拉伸处理，以调整被拉伸的曲面区域的偏光配向轴方向及相应的可视角度，使得偏光层根据其在曲面显示面板中的位置/曲率具有不同的轴向偏振性，偏光板整体上具有多轴向偏振性，满足了曲面显示面板的广视角需求。
在一个实施例中，如图2所示，步骤S101具体包括：
S201，获取偏光层基膜。
在本实施例中，偏光层基膜的材质为聚乙烯醇膜(Poly Vinyl Alcohol，PVA)。
S203，使用对光线具有起偏性的第一离子的第一溶液对所述偏光层基膜进行染色处理。
将偏光层基膜放置在对光线具有起偏性的离子溶液中，对光线具有起偏性的离子吸附在偏光层基膜上，以实现对偏光层基膜的染色。步骤S103通过拉伸使得第一离子形成具有方向性且可依自身方向吸收光线的离子或分子长链。
在一个实施例中，染色处理使用的溶液中所包含对光线具有起偏性的离子为单一离子。该溶液可以为碘离子溶液(I2/KI水溶液)。将偏光层基膜放置于碘离子溶液中，碘离子扩散吸附在偏光层基膜中形成络合物，再经步骤S103的拉伸作用使附着于PVA上碘离子随之有方向性，形成碘离子长链。在其他实施例中，该溶液还可以为溴离子溶液等。
在一实施例中，染色处理使用的溶液为包含至少两种对光线具有起偏性的离子的混合溶液。该混合溶液可以为碘离子和溴离子的混合溶液。将偏光层基膜放置在碘离子和溴离子的混合溶液中，碘离子和溴离子扩散吸附在偏光层基膜中形成不同的络合物。碘离子和溴离子对光线的起偏方向不一样，因此偏光层基膜具有多轴向偏振性。在其他实施例中，染色处理使用的溶液 中包含的对光线具有起偏性的离子可以具有不同离子态。例如，该溶液中的离子可以为I3-离子，也可以为I5-离子，还可以同时包含I3-离子和I5-离子。
在一实施例中，染色处理过程可以对偏光层的不同曲面区域采用不同的溶液进行处理，以使得偏光层的不同曲面区域具有不同的轴向偏振性，进而实现偏光层的多轴向偏振性。例如对于图3所示的偏光层，可以对主视区310采用对光线具有起偏性的第一离子的溶液进行染色处理，对和辅视区321、辅视区323采用对光线具有起偏性的第二离子的溶液进行染色处理。在一个实施例中，是采用碘离子溶液对主视区310进行染色处理，采用溴离子溶液对辅视区321和辅视区323进行染色处理，即第二离子中对光线具有起偏性的化学元素为与第一离子中对光线具有起偏性的化学元素不同的元素。在另一个实施例中，是采用碘离子溶液对主视区310进行染色处理，采用碘离子和溴离子溶液的混合溶液对辅视区321和辅视区323进行染色处理。可以理解，实际处理过程中包括但并不限于上述实施例。
在另一实施例中，也可以利用具有对光线具有起偏性的离子的不同离子态的溶液对偏光层基膜的不同曲面区域进行处理，使得偏光层基膜的不同曲面区域具有不同的离子态，从而使得偏光层基膜具有多轴向偏振态。例如对偏光层基膜的主视区310采用I3-离子溶液进行染色处理，对偏光层的辅视区321和辅视区323采用I5-离子溶液进行染色处理，以使得偏光层基膜的主视区310和辅视区321和辅视区323的偏光配向轴方向不相同，即第二离子中对光线具有起偏性的化学元素为与第一离子中对光线具有起偏性的化学元素相同的元素、不同的离子态。在另一实施例中，也可以对偏光层基膜的主视区310采用I3-离子溶液进行染色处理，对辅视区321和辅视区323采用I3-离子和I5-离子共存的混合溶液进行染色处理。
在一个实施例中，步骤S103对偏光层的不同曲面区域进行不同拉伸力度的拉伸或进行不同方向的拉伸，以使得对应区域内对光线具有起偏性的离子具有不同的方向性，也即是使得偏光层的不同区域具有不同的偏光配向轴方向。在本实施例中，对光线具有偏光性的离子为碘离子。碘离子吸附在偏光 层中，经过拉伸形成碘离子长链。对偏光层进行不同方向上的拉伸或进行不同力度的拉伸使得偏光层上形成不同的碘离子长链，从而使偏光层具有不同的偏光配向轴方向。在另一实施例中，也可以同时采用不同的拉伸力度和拉伸方向对不同的曲面区域进行拉伸处理。
显示面板的曲面区域因弯曲和拉伸导致粘接层的附着力降低，长时间使用容易产生可靠性问题。在一个实施例中，步骤S103之后还包括以下步骤：
将偏光层与粘接层固定在一起，粘接层的材质包括加热后粘度会增加的热敏感物质。
通过粘接层将偏光板粘接在曲面显示面板上，然后对粘接层进行加热处理。该热敏感物质在加热后即使恢复到室温，粘度也不会下降到加热之前，故能够使得粘接层加热部位的粘度增加，从而使粘接层有良好的附着力，提高了曲面显示面板各部分的可靠性。
在一个实施例中，对粘接层进行加热是对粘接层曲率较大的部位(曲面区域)进行加热。实际制造中可以设置曲率阈值，对于大于曲率阈值的部位进行加热。
本申请还提供一种偏光板。如图4所示，该偏光板包括保护层410、保护层420、偏光层430、保护层440、粘接层450以及分离层460。保护层410为偏光板的表面保护层，用于保护偏光层430。保护层410可以为聚对苯二甲酸类塑料(Polyethylene terephthalate，PET)。保护层420和保护层440分别位于偏光层430的两侧，可以增加偏光层430的支撑保护，进而增加偏光板的机械性能。保护层420和保护层440一方面可以对偏光层430的偏光层基膜进行保护，一方面可以防止偏光层430的偏光层基膜的回缩。在一实施例中，保护层420和保护层440可以为三醋酸纤维素酯(Triacetate Cellulose，TAC)。偏光层430作为偏光板的偏光基质，对透过偏光板的光进行过滤。偏光层430为不同区域具有不同的偏光配向轴方向的偏光层，采用上述任一实施例所述的偏光板的制作方法制作偏光层430。偏光层430可以为聚乙烯醇(Poly Vinyl Alcohol，PVA)。粘接层450用于偏光板与曲面显示面板的粘接。 当偏光板与曲面显示面板粘接时，通过偏光板的粘接层450与曲面显示面板的玻璃进行吸附粘接。通常粘接层450可以为压敏胶(PSV)层。压敏胶的主要成分是聚丙烯类胶，伸缩性较小。
在一个实施例中，在压敏胶中加入热敏感物质。在偏光板与曲面显示面板粘接后，对曲面显示面板的曲面位置进行加热。由于加热部位的粘接层450存在热敏感物质，使得加热部位的粘度增加，从而使曲面显示面板的曲面部分有良好的附着力。即提高了曲面显示面板各部分的信赖性。分离层460用于对粘接层450的保护。分离层460可以为聚对苯二甲酸类塑料(Polyethylene terephthalate，PET)。
在图3所示的实施例中，主视区310的出光面与辅视区321的出光面在连接处形成的角度大于90度小于180度，与辅视区323的出光面在连接处形成的角度大于90度小于180度。
本申请还提供一种曲面显示面板。该曲面显示面板包括第一偏光板、彩色滤光片基板、液晶层、薄膜晶体管阵列基板、第二偏光板和背光模组。第一偏光板、彩色滤光片基板、薄膜晶体管阵列基板、第二偏光板和背光模组叠加组合为一体。液晶层设置于彩色滤光片基板和薄膜晶体管阵列基板之间。背光模组用于向由第一偏光板、彩色滤光片基板、液晶层、薄膜晶体管阵列基板和所第二偏光板所组成的整体提供光源。其中，第一偏光板和第二偏光板均为上述任一实施例所述的偏光板，即采用上述任一实施例所述的偏光板的制作方法制作第一偏光板和第二偏光板。曲面显示面板包括主视区和至少一个辅视区，曲面显示面板的辅视区连接在曲面显示面板的主视区的至少一侧，曲面显示面板的辅视区的曲率大于曲面显示面板的主视区的曲率，曲面显示面板的主视区的出光面与曲面显示面板的辅视区的出光面在连接处形成的角度大于90度小于180度。
在本实施例中，曲面显示面板可以为LCD曲面显示面板、OLED曲面显示面板、QLED曲面显示面板或者其他曲面显示面板，本实施例中不对曲面显示面板的具体类型作特别限定。
需要说明的是，显示装置例如为LCD(Liquid Crystal Display)显示装置、OLED(Organic Light-Emitting Diode)显示装置、QLED(Quantum Dot Light Emitting Diodes)显示装置、曲面显示装置或其他显示装置。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (17)

  1. 一种偏光板的制作方法，包括：
    提供偏光层，所述偏光层包括多个曲率不相同的曲面区域，各曲面区域的曲率大于等于2000R；以及
    对至少部分曲面区域进行拉伸处理，以调整被拉伸的曲面区域的偏光配向轴方向及相应的可视角度，所述拉伸处理使得所述偏光配向轴相对于拉伸前的夹角为0度～180度。
  2. 根据权利要求1所述的方法，其中，所述对至少部分曲面区域进行拉伸处理的步骤，包括：
    对不同的曲面区域施以不同的拉伸力度以获得不同的所述偏光配向轴方向。
  3. 根据权利要求1所述的方法，其中，所述对至少部分曲面区域进行拉伸处理的步骤，包括：
    对不同的曲面区域施以不同的拉伸角度以获得不同的所述偏光配向轴方向。
  4. 根据权利要求1所述的方法，其中，所述对至少部分曲面区域进行拉伸处理的步骤，包括：
    对不同的曲面区域施以不同的拉伸力度和角度以获得不同的所述偏光配向轴方向。
  5. 根据权利要求1所述的方法，其中，所述提供偏光层的步骤包括：
    获取偏光层基膜；以及
    使用对光线具有起偏性的第一离子的第一溶液对所述偏光层基膜进行染色处理；
    所述对部分曲面区域进行拉伸处理的步骤是通过拉伸使得所述第一离子形成具有方向性且可依自身方向吸收光线的离子或分子长链。
  6. 根据权利要求5所述的方法，其中，所述使用对光线具有起偏性的第一离子的第一溶液对所述偏光层基膜进行染色处理的步骤，包括：
    将偏光层基膜放置在对光线具有起偏性的离子溶液中，对光线具有起偏性的离子吸附在所述偏光层基膜上，以实现对所述偏光层基膜的染色。
  7. 根据权利要求6所述的方法，其中，所述离子为碘离子或溴离子；所述溶液为碘离子溶液或溴离子溶液。
  8. 根据权利要求6所述的方法，其中，所述离子为碘离子和溴离子；所述溶液为碘离子和溴离子的混合溶液。
  9. 根据权利要求5所述的方法，其中，所述使用对光线具有起偏性的第一离子的第一溶液对所述偏光层基膜进行染色处理的步骤，包括：
    对部分所述曲面区域的偏光层基膜使用第一溶液进行染色处理；以及
    对部分所述曲面区域的偏光层基膜使用第二溶液进行染色处理；以使得使用不同的溶液进行染色处理的曲面区域具有不同的光线吸收方向；所述第二溶液包括对光线具有起偏性的第二离子。
  10. 根据权利要求9所述的方法，其中，所述第二离子中对光线具有起偏性的化学元素为与第一离子中对光线具有起偏性的化学元素不同的元素。
  11. 根据权利要求9所述的方法，其中，所述第二离子中对光线具有起偏性的化学元素为与第一离子中对光线具有起偏性的化学元素相同的元素、不同的离子态。
  12. 根据权利要求1所述的方法，其中，所述对至少部分曲面区域进行拉伸处理的步骤之后，还包括：
    提供粘接层；
    将所述偏光层与粘接层固定在一起，所述粘接层的材质包括加热后粘度会增加的热敏感物质；以及
    通过所述粘接层将所述偏光板粘接在曲面显示面板上，然后对所述粘接层进行加热处理。
  13. 根据权利要求12所述的方法，其中，所述对所述粘接层进行加热处理的步骤，包括：
    设置所述粘接层的曲率阈值；以及
    对所述粘接层中曲率大于所述曲率阈值的区域进行加热。
  14. 一种偏光板，包括：
    偏光层，包括主视区和至少一个辅视区，所述辅视区连接在所述主视区的至少一侧，所述辅视区的曲率与所述主视区的曲率不相等，所述辅视区和主视区的曲率均大于等于2000R，所述辅视区具有与主视区不同的偏光配向轴方向以调整所述辅视区的可视角度，所述辅视区的偏光配向轴与主视区的偏光配向轴夹角为0度～180度；
    保护层，设置在所述偏光层的至少一侧，设置为将所述偏光层的与外界环境隔离；以及
    粘接层，设于所述保护层相对于所述偏光层的一侧，设置为将所述偏光板粘接在曲面显示面板上。
  15. 根据权利要求14所述的偏光板，其中，所述辅视区的曲率大于所述主视区的曲率，所述主视区的出光面与所述辅视区的出光面在连接处形成的角度大于90度小于180度。
  16. 根据权利要求15所述的偏光板，其中于，所述粘接层的材质包括加热后粘度会增加的热敏感物质。
  17. 一种曲面显示面板，包括：
    第一偏光板；以及
    第二偏光板，所述第一偏光板和第二偏光板为权利要求15所述的偏光板；
    所述曲面显示面板包括主视区和至少一个辅视区，所述曲面显示面板的辅视区连接在所述曲面显示面板的主视区的至少一侧，所述曲面显示面板的辅视区的曲率大于所述曲面显示面板的主视区的曲率，所述曲面显示面板的主视区的出光面与所述曲面显示面板的辅视区的出光面在连接处形成的角度大于90度小于180度。
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