WO2017118205A1 - 偏振片及其制作方法、显示装置 - Google Patents

偏振片及其制作方法、显示装置 Download PDF

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Publication number
WO2017118205A1
WO2017118205A1 PCT/CN2016/104971 CN2016104971W WO2017118205A1 WO 2017118205 A1 WO2017118205 A1 WO 2017118205A1 CN 2016104971 W CN2016104971 W CN 2016104971W WO 2017118205 A1 WO2017118205 A1 WO 2017118205A1
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WO
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Prior art keywords
quantum rod
film layer
substrate
polarizing plate
quantum
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PCT/CN2016/104971
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English (en)
French (fr)
Inventor
杨久霞
白峰
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京东方科技集团股份有限公司
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Priority to US15/540,134 priority Critical patent/US20180011372A1/en
Publication of WO2017118205A1 publication Critical patent/WO2017118205A1/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
    • G02F1/133533—Colour selective polarisers
    • 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
    • G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
    • 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
    • G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
    • 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
    • G02F1/1335—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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
    • G02F1/133562—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the viewer side
    • 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
    • G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
    • G02F1/133567—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the back side
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials

Definitions

  • Embodiments of the present invention relate to a polarizing plate, a method of fabricating the same, and a display device.
  • a liquid crystal display panel mainly includes an array substrate, a color filter substrate, and a liquid crystal layer between the array substrate and the color filter substrate.
  • the array substrate comprises: a substrate, a gate above the substrate, a gate insulating layer above the gate, an active layer above the gate insulating layer, a signal line layer above the active layer (including a source layer disposed in the same layer) a drain electrode, an insulating layer above the signal line layer, and a pixel electrode above the insulating layer and electrically connected to the drain through a via hole penetrating the insulating layer.
  • the main steps of fabricating the liquid crystal display panel include: fabricating the array substrate and the color filter substrate, and performing a box-to-box process on the array substrate and the color filter substrate.
  • the alignment film printing and the photoalignment processing are respectively performed on the array substrate and the color filter substrate, and then the liquid crystal is injected between the array substrate and the color filter substrate, sealed with a sealant, and finally cut into A single panel is formed by applying polarizing plates whose polarization directions are perpendicular to each other on the upper and lower sides of a single panel to form a liquid crystal display panel.
  • the polarizing plate disposed above the color filter substrate is called an upper polarizing plate (CF POL), and the polarizing plate disposed under the array substrate is called a lower polarizing plate (TFT POL).
  • the polarizing plate allows only light having a direction parallel to the direction of the transmission axis to pass therethrough, the backlight will have a 50% loss after passing through the lower polarizing plate, resulting in a decrease in backlight utilization.
  • Embodiments of the present invention provide a polarizing plate, a manufacturing method thereof, and a display device for solving the problem of low utilization of a backlight caused by a polarizing plate in the prior art.
  • the embodiment of the invention provides a polarizing plate, the polarizing plate includes: a substrate substrate and a quantum rod film layer on a side of the substrate substrate; wherein the quantum rod film layer comprises a plurality of aligned directions Quantum rods.
  • the embodiment of the invention further provides a display device, comprising a display panel, the display panel comprises a color film substrate, an array substrate, a liquid crystal layer disposed between the color film substrate and the array substrate, and the color film is disposed on the color film
  • a display device comprising a display panel
  • the display panel comprises a color film substrate, an array substrate, a liquid crystal layer disposed between the color film substrate and the array substrate, and the color film is disposed on the color film
  • the embodiment of the invention further provides a method for fabricating a polarizing plate, the method comprising: forming a pattern comprising a quantum rod film layer on a substrate; the quantum rod film layer comprises a plurality of quantum rods having the same arrangement direction.
  • FIG. 1a is a schematic cross-sectional structural view of a polarizing plate according to Embodiment 1 of the present invention
  • FIG. 1b is a schematic diagram of a polarization principle of a polarizing plate according to an embodiment of the invention
  • FIG. 2 is a schematic cross-sectional structural view of a polarizing plate according to Embodiment 2 of the present invention.
  • FIG. 3a is a schematic cross-sectional structural view of a polarizing plate according to Embodiment 3 of the present invention.
  • FIG. 3b is a schematic cross-sectional structural view of another polarizing plate according to Embodiment 3 of the present invention.
  • FIG. 4 is a schematic flow chart of a method for fabricating a polarizing plate according to an embodiment of the present invention
  • FIG. 5 is a schematic flow chart of another method for fabricating a polarizing plate according to an embodiment of the present invention.
  • 6a is a schematic cross-sectional structural view of a display panel according to an embodiment of the present invention.
  • 6b is a schematic cross-sectional structural view of another display panel according to an embodiment of the present invention.
  • FIG. 7a is a schematic cross-sectional structural view of another display panel according to an embodiment of the present invention.
  • FIG. 7b is a cross-sectional structural diagram of another display panel according to an embodiment of the present invention.
  • Embodiments of the present invention provide a polarizing plate, a manufacturing method thereof, and a display device for solving the problem of low utilization of a backlight caused by a polarizing plate in the prior art.
  • a first embodiment of the present invention provides a polarizing plate.
  • the polarizing plate includes a base substrate 11 and a quantum rod film layer 12 on the side of the base substrate 11.
  • the quantum rod film layer 12 includes a plurality of quantum rods 13 that are aligned in the same direction.
  • a quantum rod is, for example, a rod-shaped nanocrystal.
  • the plurality of quantum rods 13 in the quantum rod film layer 12 are arranged in parallel with each other, and the arrangement direction of the long axes 131 of the quantum rods 13 is uniform.
  • the major axis direction 131 of the quantum rod 13 is parallel to the base substrate 11.
  • the alignment directions are identical, for example, including the long axis direction 131 being aligned.
  • quantum rod luminescence is that its inner core (ie, quantum dot) can be excited by light. Since the quantum rod has directivity and can perform linearly polarized emission, the quantum rod film can convert the light passing through the layer into polarized light.
  • the quantum rod has high quantum efficiency, so the backlight light can be converted into polarized light in a large amount, and the conversion efficiency is high, which can avoid the light loss caused by the absorption polarizing plate, improve the utilization rate of the backlight, and improve the brightness of the display panel. Since the excitation spectrum of the quantum rod material can have a narrow half-height width, the color gamut area that the display can represent can be made wider. Thus, setting the quantum rod film layer can also realize image display with high brightness and high color gamut.
  • the long axis direction of the quantum rod absorbs the unpolarized light and excites polarized light longer than the wavelength of the original incident source.
  • the unpolarized light L1 passes through the quantum rod film layer, it is converted into linearly polarized light L2, and light parallel to the long axis direction is reflected, and light perpendicular to the long axis direction is transmitted through the quantum rod film layer.
  • the polarization direction of the linearly polarized light L2 is perpendicular to the long axis direction of the quantum rod.
  • the second embodiment of the present invention further provides a polarizing plate.
  • the polarizing plate is provided.
  • the substrate substrate 11 and the quantum rod film layer 12 on the side of the substrate substrate 11 are included.
  • Quantum rod The film layer 12 includes a plurality of quantum rods 13 that are aligned in the same direction.
  • the polarizing plate further includes a first electrode 15 located on a side of the quantum rod film layer 12 away from (backward) the substrate substrate 11; and, located near the quantum rod film layer 12 (facing a second electrode 16 on one side of the base substrate 11.
  • the back direction means, for example, a distance
  • the aspect for example, means close.
  • the quantum rod in the operating state, positive and negative voltages are applied to the first electrode 15 and the second electrode 16, respectively, such that a uniform electric field is generated between the first electrode 15 and the second electrode 16.
  • the quantum rod Under the action of the electric field, the quantum rod is excited by the electric field to generate electron-hole pairs.
  • the electrons that transition from the valence band to the conduction band are in a non-equilibrium state, and will be recombined by the conduction band transition to the valence band.
  • photons are generated when the conduction band directly transitions back to the valence band, so that the quantum rod film layer can generate polarized light under the action of the electric field.
  • the polarizing plate further includes a first electrode distributed on a side of the quantum rod film layer away from (backward) the substrate, and a second electrode located on a side of the quantum rod film layer facing (facing) the substrate Applying a voltage to the quantum rod film layer by using the first electrode and the second electrode to form a voltage difference, generating an electric field, so that the quantum rod is excited by the light, and can generate polarized light required for image display, without separately setting a backlight and a lower
  • the polarizing plate can be used instead of the backlight and the lower polarizing plate, which is advantageous for simplifying the manufacturing process of the display substrate, reducing the production cost, realizing the thin and light design of the display panel, and avoiding the light loss caused by the absorption polarizing plate and improving Backlight utilization.
  • the polarized light emitted by the quantum rod layer directly enters the electrode layer, the liquid crystal layer, etc., thereby improving the utilization of light and improving the brightness of the display panel, thereby realizing image display with high brightness and high color gamut.
  • the polarizing plate needs to be directly applied under the array substrate, so that the quantum film layer may be damaged during the application process, in order to avoid this,
  • the polarizing plate provided in the third embodiment of the present invention further includes a flat layer 17 on a side of the quantum rod film layer away from (backward) the substrate.
  • the quantum rod film layer 12 can be protected from contact damage by providing the flat layer 17, and at the same time, the contact area of the polarizing plate with the array substrate can be increased, the bonding strength of the polarizing plate on the array substrate can be increased, and the polarizing plate can be reduced. The probability of shedding on the array substrate.
  • the quantum rod film layer 12 may be made of any one of cadmium selenide, cadmium sulfide, zinc sulfide, zinc selenide, calcium sulfide, and calcium selenide, but is not limited thereto.
  • cadmium selenide, cadmium sulfide, zinc sulfide, zinc selenide, calcium sulfide and calcium selenide are direct band gap semiconductors
  • the forbidden band width is well matched to the visible light band and can absorb most of the visible light and The absorbed visible light is converted into polarized light, which is beneficial to improve the utilization of the backlight.
  • the technology for making quantum rod film layers by using these materials is relatively mature and the sources of raw materials are abundant, which is beneficial to reduce production costs.
  • a fourth embodiment of the present invention further provides a method for fabricating a polarizing plate, the method comprising: forming a pattern including a quantum rod film layer on a substrate; the quantum rod film layer includes a plurality of quantum rods arranged in the same direction .
  • the polarizing plate formed by the method includes a quantum rod film layer including a plurality of quantum rods having the same arrangement direction. Since the quantum rod has directivity and can perform linearly polarized emission, the quantum rod film can convert light passing through the layer into polarized light, and can also improve light utilization to realize image display with high brightness and high color gamut. At the same time, it can also improve the brightness of the display panel.
  • the quantum rod film layer may be formed by coating or crystal growth.
  • the technique of forming a quantum rod film layer by coating or crystal growth is relatively mature, which is beneficial to reduce the process difficulty.
  • forming a quantum rod film layer by crystal growth includes the following steps.
  • the quantum rod film layer transferred onto the substrate is planarized so that the quantum rod film layer has a flat surface.
  • forming the quantum rod film layer by coating means may include the following steps.
  • the pre-cured solution coating is embossed by a nanoimprinting process to form a quantum rod film layer comprising regularly arranged quantum rods;
  • the quantum rod film layer is planarized so that the quantum rod film layer has a flat surface.
  • the quantum rod content in the mixed solution may be from 1% to 5%.
  • the concentration range can avoid the quantum rod of the quantum rod film layer formed due to the low content of the quantum rod in the mixed solution being too sparse, so that the polarizing effect of the polarizing plate is weak. It is also possible to avoid the phenomenon of polarization caused by the occurrence of lamination of quantum rods in the quantum rod film layer formed by the excessive content of quantum rods in the mixed solution.
  • An organic solvent and a solidified material may also be included in the mixed solution.
  • the organic solvent may be methyl ethyl ketone, methyl isobutyl ketone, monomethyl ether glycol ester, ⁇ -butyrolactone, 3-ethyl ether propionate, butyl carbitol, butyl carbitol.
  • the cured material is a resin material, and the resin mainly includes an acrylic resin and an epoxy resin.
  • the acrylic resin may be any one of methyl acrylate, ethyl acrylate, 2-methyl methacrylate, 2-ethyl methacrylate, polyester acrylate, urethane acrylate, epoxy acrylate;
  • the oxyresin may be any of an aliphatic epoxy resin and a bisphenol A epoxy resin.
  • the content of the solidified material in the mixed solution is also different depending on the selected curing material.
  • the content of the solidified material in the mixed solution may be 1% to 10%; when the curing material is an acrylic resin, the content of the solidified material in the mixed solution may be 15% to 20%.
  • the content of the organic solvent in the mixed solution is from 60% to 80%.
  • the content of the organic solvent in the mixed solution is in the range of 60% to 80%, it is advantageous to form a solution coating having a uniform film thickness, and it is ensured that the density of the quantum rod is not too low and the polarization is weak.
  • Step 41 preparing a nanocrystalline reaction chamber for synthesizing the quantum rod crystal on the master to generate a quantum rod in the nanocrystalline reaction chamber.
  • step 42 a layer of surfactant is uniformly coated on the master of the reaction chamber, so that the quantum rod film layer synthesized by the reaction can be transferred from the master onto the substrate.
  • step 43 by controlling the temperature in the reaction chamber, a plurality of quantum rods having uniform sizes are formed in the reaction chamber to obtain a quantum rod film layer.
  • step 44 the quantum rod film layer is transferred onto the base substrate of the polarizing plate, and then released.
  • step 45 a layer of transparent insulating material is coated on the quantum rod film layer to form a flat layer for protecting the quantum rod film layer from contact damage.
  • This step includes:
  • thermosetting material is coated on the quantum rod film layer
  • thermosetting material is cured by a thermal curing process to form a flat layer.
  • the curing process takes about 30 minutes and the temperature is set at about 250 °C.
  • the flat layer can also be made of a photocurable material, and the manufacturing process can be referred to the general technology, and details are not described herein again.
  • the above is to form a quantum rod film layer by means of crystal growth, and the following details
  • the method of forming a quantum rod film layer by means of cloth, see Fig. 5, includes the following steps.
  • step 51 the quantum rod material, the organic solvent and the solidified material are mixed to obtain a mixed solution containing quantum rods.
  • the quantum rod content in the mixed solution is from 1% to 5%.
  • the concentration range can avoid the quantum rod of the quantum film layer formed due to the low content of the quantum rod in the mixed solution being too sparse, so that the polarizing effect of the polarizing plate is weak. It is also possible to avoid the occurrence of a lamination phenomenon in the quantum film formed in the quantum film layer due to the excessive content of the quantum rod in the mixed solution, thereby affecting the polarization.
  • the content of the organic solvent in the mixed solution is from 60% to 80%.
  • the content of the organic solvent in the mixed solution is in the range of 60% to 80%, it is advantageous to form a solution coating having a uniform film thickness, and it is ensured that the density of the quantum rod is not too low and the polarization is weak.
  • step 52 a mixed solution containing quantum rods is coated on a substrate to form a solution coating.
  • the coating process is carried out by means of smooth roll coating, web roll coating, doctor blade coating, spray coating or curtain coating.
  • the solution coating is pre-cured so that the viscosity of the solution in the solution coating meets the requirements of the nanoimprint process.
  • the pre-curing process can be carried out by means of heat curing or photo-curing; in order to reduce the production cost in the production process, the pre-curing is generally carried out by means of thermal curing, and in the case of thermal curing, the solution coating is heated at a temperature of 220 ° C. 20 minutes or so.
  • step 54 the pre-cured solution coating is embossed by a nanoimprint process to form a quantum rod film layer comprising regularly arranged quantum rods.
  • Step 55 coating a layer of transparent solidified material on the quantum rod film layer to form a flat layer for protecting the quantum rod film layer from contact damage.
  • the process of this step is the same as the process in step 45, and will not be described again here.
  • an embodiment of the present invention further provides a display panel, see FIG. 6a.
  • the display panel includes a color filter substrate 61, an array substrate 62, a liquid crystal layer 63 disposed between the color filter substrate and the array substrate, a lower polarizing plate 64 disposed on a side of the array substrate away from (backward) the liquid crystal layer, and
  • the color filter substrate 61 is away from (backward) the upper polarizing plate 65 on one side of the liquid crystal layer 63.
  • At least the lower polarizing plate 64 is a polarizing plate as described above.
  • a display panel is also provided.
  • the polarizing plate can adopt a pattern of electroluminescence to form linearly polarized light.
  • the display panel further includes a first diffusion sheet 71 and a first edge.
  • the first prism sheet 72 and the second prism sheet 73 may be vertically arranged to increase the brightness of the backlight.
  • the diffuser plate makes the illuminating effect more uniform.
  • the linearly polarized light reflected by the quantum rod passes through the diffusion sheet and becomes unpolarized light, and is reflected and reused by the reflection sheet, thereby further improving the light utilization efficiency.
  • the display panel is further provided with a backlight 66 for providing display, and the backlight 66 is disposed.
  • a backlight 66 for providing display, and the backlight 66 is disposed.
  • a display panel is further provided, as shown in FIG. 7b, further comprising a first diffusion sheet 71, a first prism sheet 72, and a second prism sheet 73 disposed between the array substrate and the backlight. a second diffusion sheet 74, and a reflection sheet 75 disposed on a side of the backlight away from the array substrate.
  • the linearly polarized light reflected by the quantum rod passes through the diffusion sheet and becomes unpolarized light, and is reflected and reused by the reflection sheet, thereby further improving the light utilization efficiency.
  • an embodiment of the present invention further provides a display device including the display panel as described above.
  • an embodiment of the present invention provides a polarizing plate, a manufacturing method thereof, and a display device.
  • the polarizing plate comprises a quantum rod film layer, and the quantum rod film layer comprises a plurality of quantum rods arranged in the same direction. Since the quantum rod has directivity and can perform linearly polarized emission, the quantum rod film can convert the light passing through the layer into polarized light, thereby avoiding light loss caused by using the polarizing plate and improving the utilization of the backlight. At the same time, the brightness of the display panel can be improved to realize image display with high brightness and high color gamut.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)

Abstract

一种偏振片及其制作方法、显示装置。该偏振片包括：衬底基板(11)和位于所述衬底基板(11)一侧的量子棒膜层(12)；所述量子棒膜层(12)包括多个排列方向一致的量子棒(13)。该偏振片可提高背光源的利用率，同时还可以提高显示面板的亮度，以实现具有高亮度、高色域的图像显示。

Description

偏振片及其制作方法、显示装置 技术领域
本发明的实施例涉及一种偏振片及其制作方法、显示装置。
背景技术
通常，液晶显示面板主要包括：阵列基板，彩膜基板以及位于阵列基板和彩膜基板之间的液晶层。阵列基板包括：基底，位于基底上方的栅极，位于栅极上方的栅绝缘层，位于栅绝缘层上方的有源层，位于有源层上方的信号线层(包括同层设置的源极和漏极)，位于信号线层上方的绝缘层，以及位于绝缘层上方的、且通过贯穿绝缘层的过孔与漏极电连接的像素电极。制作液晶显示面板的主要步骤包括：制作阵列基板和彩膜基板，以及对阵列基板和彩膜基板进行对盒工艺。例如，在对盒工艺中，首先分别对阵列基板和彩膜基板进行配向膜印刷以及光配向处理，然后在阵列基板和彩膜基板之间注入液晶，并使用封框胶进行密封，最后切割成单个面板并通过在单个面板的上下两侧贴敷偏振方向相互垂直的偏振片以形成液晶显示面板。设置在彩膜基板上方的偏振片叫做上偏振片(CF POL)，设置在阵列基板下方的偏振片叫做下偏振片(TFT POL)。
但是，由于偏振片只允许振动方向与其透射轴方向平行的光通过，因此，背光源在通过下偏振片后会有50％的损失，导致背光源利用率降低。
发明内容
本发明的实施例提供了一种偏振片及其制作方法、显示装置，用于解决通常技术中偏振片所导致的背光源利用率低的问题。
本发明实施例提供了一种偏振片，所述偏振片包括：衬底基板和位于所述衬底基板一侧的量子棒膜层；其中，所述量子棒膜层包括多个排列方向一致的量子棒。
本发明实施例还提供了一种显示装置，包括显示面板，所述显示面板包括彩膜基板、阵列基板、设置在所述彩膜基板和阵列基板之间的液晶层、设置在所述彩膜基板远离所述液晶层的一侧的上偏振片、以及设置在所述阵列 基板远离所述液晶层的一侧的下偏振片；至少所述下偏振片为本发明实施例所述的任一偏振片。
本发明实施例还提供了一种偏振片的制作方法，所述方法包括：在衬底基板上形成包括量子棒膜层的图形；所述量子棒膜层包括多个排列方向一致的量子棒。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例，而非对本发明的限制。
图1a为本发明实施例一提供的一种偏振片的剖面结构示意图；
图1b为本发明一实施例提供的一种偏振片的偏振原理示意图；
图2为本发明实施例二提供的一种偏振片的剖面结构示意图；
图3a为本发明实施例三提供的一种偏振片的剖面结构示意图；
图3b为本发明实施例三提供的另一种偏振片的剖面结构示意图；
图4为本发明实施例提供的一种偏振片的制作方法流程示意图；
图5为本发明实施例提供的另一种偏振片的制作方法流程示意图；
图6a为本发明实施例提供的一种显示面板的剖面结构示意图；
图6b为本发明实施例提供的另一种显示面板的剖面结构示意图；
图7a为本发明实施例提供的另一种显示面板的剖面结构示意图；
图7b为本发明实施例提供的另一种显示面板的剖面结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例的附图，对本发明实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于所描述的本发明的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
除非另作定义，此处使用的技术术语或者科学术语应当为本发明所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二” 以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”、“一”或者“该”等类似词语也不表示数量限制，而是表示存在至少一个。包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
本发明的实施例提供了一种偏振片及其制作方法、显示装置，用于解决通常技术中偏振片所导致的背光源利用率低的问题。
本发明实施例一提供了一种偏振片，参见图1a，偏振片包括：衬底基板11和位于衬底基板11一侧的量子棒膜层12。量子棒膜层12包括多个排列方向一致的量子棒13。量子棒例如是指棒状的纳米晶体。
例如，如图1b所示，量子棒膜层12中的多个量子棒13相互平行排列，量子棒13的长轴131的排列方向一致。图1b中，量子棒13的长轴方向131平行于衬底基板11。排列方向一致例如包括长轴方向131排列一致。
量子棒发光的实质是其内核(即量子点)能够被光激发发光，由于量子棒具有指向性，能够进行线偏振发射，因此量子棒膜层可将经过该层的光转化为偏振光，因量子棒内部量子效率高，故背光源光线可大量转换为偏振光，转化效率高，可避免因采用吸收式偏振片所造成的光损失，提高背光源的利用率，提高显示面板的亮度。由于量子棒材料的激发光谱可具有较窄的半高宽，故而可使得显示器所能表现的色域面积更广。从而，设置量子棒膜层还可以实现具有高亮度、高色域的图像显示。
如图1b所示，量子棒的长轴方向可吸收非偏振光线后激发出比原入射光源波长较长的偏振光线。非偏振光线L1经过量子棒膜层后，转变为线偏振光L2，平行于长轴方向的光被反射，垂直于长轴方向的光可透过量子棒膜层。线偏振光L2的偏振方向垂直于量子棒的长轴方向。
当量子棒膜层的制作材料为电致发光材料时，量子棒膜层在电场的作用下自身可产生偏振光，因此本发明实施例二还提供了一种偏振片，参见图2，偏振片包括：衬底基板11和位于衬底基板11一侧的量子棒膜层12。量子棒 膜层12包括多个排列方向一致的量子棒13。为了使量子棒膜层12产生偏振光，偏振片还包括位于量子棒膜层12远离(背向)衬底基板11的一侧的第一电极15；以及，位于量子棒膜层12靠近(面向)衬底基板11的一侧的第二电极16。本公开的实施例中，背向例如是指远离，面向例如是指靠近。
例如，在工作状态下，对第一电极15和第二电极16分别施加正负电压，使得在第一电极15和第二电极16之间产生均匀的电场。在电场的作用下，量子棒受电场激发产生电子-空穴对，由价带跃迁到导带的电子处于非平衡状态，会由导带跃迁到价带发生复合。在跃迁的过程中，由导带直接跃迁回到价带时产生光子，从而使得量子棒膜层在电场的作用下可产生偏振光。
因此，当偏振片还包括分布位于量子棒膜层远离(背向)衬底基板的一侧的第一电极、以及位于量子棒膜层靠近(面向)衬底基板的一侧的第二电极时，利用第一电极和第二电极对量子棒膜层施加电压，形成电压差，产生电场，使得量子棒受激发光，可以产生实现图像显示所需的偏振光，不需要另外设置背光源和下偏振片，可以代替背光源和下偏振片使用，有利于简化显示基板的制作工艺，降低生产成本，实现显示面板的轻薄化设计，还可避免因采用吸收式偏振片所造成的光损失，提高背光源的利用率。同时，由量子棒层发出的偏振光直接进入电极层、液晶层等，可以提高光线的利用率，提高显示面板的亮度，以实现具有高亮度、高色域的图像显示。
进一步的，由于在制作显示面板的过程中，需要将偏振片直接贴敷在阵列基板的下方，因此在贴敷的过程中有可能会对量子膜层造成损害，为了避免这种情况的发生，参见图3a和图3b，本发明实施例三提供的偏振片还包括位于量子棒膜层远离(背向)衬底基板的一侧的平坦层17。
通过设置平坦层17可保护量子棒膜层12免受接触性损坏，同时还能够增大偏振片与阵列基板的接触面积，增大偏振片在阵列基板上的粘结牢固程度，降低偏振片从阵列基板上脱落的概率。
进一步的，量子棒膜层12可采用硒化镉、硫化镉、硫化锌、硒化锌、硫化钙和硒化钙中的任一种材料制作，但并不限于此。
由于硒化镉、硫化镉、硫化锌、硒化锌、硫化钙和硒化钙等材料属于直接带隙半导体，其禁带宽度与可见光波段能够很好的匹配，能够吸收大部分的可见光并将所吸收的可见光转化为偏振光，有利于提高背光源的利用率。 此外，利用这些材料制作量子棒膜层的技术相对比较成熟、原材料来源丰富，有利于降低生产成本。
基于同一发明构思，本发明实施例四还提供了偏振片的制作方法，该方法包括：在衬底基板上形成包括量子棒膜层的图形；量子棒膜层包括多个排列方向一致的量子棒。
通过该方法形成的偏振片中包含量子棒膜层，量子棒膜层包括多个排列方向一致的量子棒。由于量子棒具有指向性，能够进行线偏振发射，因此量子棒膜层可将经过该层的光转化为偏振光，还可提高光的利用率，以实现具有高亮度、高色域的图像显示，同时还可以提高显示面板的亮度。
进一步的，可采用涂布或晶体生长的方式形成量子棒膜层。
采用涂布或晶体生长的方式形成量子棒膜层的技术比较成熟，有利于降低工艺难度。
例如，采用晶体生长的方式形成量子棒膜层，包括以下步骤。
在反应腔内生成量子棒膜层；
将反应腔内的量子棒膜层转印到衬底基板上；
对转印到衬底基板上的量子棒膜层做平坦化处理，使得量子棒膜层具有平整的表面。
此外，采用涂布的方式形成量子棒膜层，可包括以下步骤。
将包含量子棒的混合溶液涂布在衬底基板上，形成一溶液涂层；
对溶液涂层进行预固化，使溶液涂层中溶液的粘稠度符合纳米压印工艺的需求；
对预固化后的溶液涂层采用纳米压印工艺进行压印，形成包括规则排布的量子棒的量子棒膜层；
对量子棒膜层做平坦化处理，使得量子棒膜层具有平整的表面。
混合溶液中量子棒含量可为1％～5％。
混合溶液中量子棒含量为1％～5％时，该浓度范围既可避免因混合溶液中量子棒含量过低导致形成的量子棒膜层中量子棒过于稀疏而使得偏振片的偏光作用较弱，还可以避免因混合溶液中量子棒含量过高导致形成的量子棒膜层中量子棒出现叠层现象而影响偏振作用。
混合溶液中还可包括有机溶剂和固化材料。
例如，有机溶剂可以是甲乙酮、甲基异丁基酮、单甲基醚乙二醇酯、γ-丁内酯、丙酸-3-乙醚乙酯、丁基卡必醇、丁基卡必醇醋酸酯、丙二醇单甲基醚、丙二醇单甲基醚醋酸酯、二乙二醇甲乙醚中的至少一种。
例如，固化材料为树脂材料，树脂主要包括丙烯酸树脂和环氧树脂。例如，丙烯酸树脂可以是丙烯酸甲酯、丙烯酸乙酯、2-甲基丙烯酸甲酯、2-甲基丙烯酸乙酯、聚酯丙烯酸酯、聚氨酯丙烯酸酯、环氧丙烯酸酯中的任何一种；环氧树脂可以是脂肪族环氧树脂、双酚A型环氧树脂中的任何一种。
根据选择的固化材料不同，混合溶液中的固化材料的含量也不同。当固化材料为环氧树脂时，混合溶液中固化材料的含量可为1％～10％；当固化材料为丙烯酸树脂时，混合溶液中固化材料的含量可为15％～20％。
例如，混合溶液中有机溶剂的含量为60％～80％。
例如，混合溶液中有机溶剂的含量处于60％～80％范围内时，有利于形成膜厚均匀的溶液涂层，且能保证量子棒的密度不会过低而导致偏振作用较弱。
下面，结合具体示例以说明利用晶体生长的方式制作本发明实施例中偏振片中的量子棒膜层的制作方法，参见图4，包括以下步骤。
步骤41，在母版上制作用于合成量子棒晶体的纳米晶反应腔，以使得在纳米晶反应腔内生成量子棒。
步骤42，在反应腔的母版上均匀涂覆一层表面活性剂，使得可以将反应合成的量子棒膜层从母版上转移到衬底基板上。
步骤43，通过控制反应腔内的温度，在反应腔内生成包含多个大小均匀一致的量子棒，得到量子棒膜层。
步骤44，将量子棒膜层转印到偏振片的衬底基板上，然后脱模。
步骤45，在量子棒膜层上涂覆一层透明绝缘材料，形成用于保护量子棒膜层免受接触性损坏的平坦层。该步骤包括：
第一步，在量子棒膜层上涂覆一层热固化材料；
第二步，采用热固化工艺将热固化材料进行固化，形成平然层。例如，固化工艺的时间约为30分钟，温度设置在250℃左右。
此外，平坦层还可以采用光固化材料制作，其制作工艺可参见通常技术，此处不再赘述。
上述是利用晶体生长的方式形成量子棒膜层，下面具体介绍一下利用涂 布的方式形成量子棒膜层的方法，参见图5，包括如下步骤。
步骤51，将量子棒材料、有机溶剂和固化材料进行混合，得到包含量子棒的混合溶液。具体的：
例如，混合溶液中量子棒含量为1％～5％。混合溶液中量子棒含量为1％～5％时，该浓度范围既可避免因混合溶液中量子棒含量过低导致形成的量子膜层中量子棒过于稀疏而使得偏振片的偏光作用较弱，还可以避免因混合溶液中量子棒含量过高导致形成的量子膜层中量子棒出现叠层现象而影响偏振作用。
例如，混合溶液中有机溶剂的含量为60％～80％。混合溶液中有机溶剂的含量处于60％～80％范围内时，有利于形成膜厚均匀的溶液涂层，且能保证量子棒的密度不会过低而导致偏振作用较弱。
步骤52，将包含量子棒的混合溶液涂布在衬底基板上，形成一溶液涂层。其中涂布工艺采用光辊涂布、网辊涂布、刮刀式涂布、喷雾涂布或帘式涂布方式进行。
步骤53，对溶液涂层进行预固化，使溶液涂层中溶液的粘稠度符合纳米压印工艺的需求。预固化的过程可采用热固化或光固化的方式进行；生产工艺中为了降低生产成本，一般采用热固化的方式进行预固化，采用热固化方式时是对溶液涂层在220℃的温度下加热20分钟左右。
步骤54，对预固化后的溶液涂层采用纳米压印工艺进行压印，形成包括规则排布的量子棒的量子棒膜层。
步骤55，在量子棒膜层上涂布一层透明的固化材料，形成用于保护量子棒膜层免受接触性损坏的平坦层。该步骤的工艺与步骤45中的工艺相同，此处不再赘述。
基于同一发明构思，本发明实施例还提供了一种显示面板，参见图6a。显示面板包括彩膜基板61、阵列基板62、设置在彩膜基板和阵列基板之间的液晶层63、设置在阵列基板远离(背向)液晶层的一侧的下偏振片64，以及设置在彩膜基板61远离(背向)液晶层63的一侧的上偏振片65。至少下偏振片64为如上所述的偏振片。
本发明另一实施例中，还提供一种显示面板，偏振片可采用电致发光形成线偏振光的模式，如图6b所示，显示面板还包括第一扩散片71、第一棱 镜片72、第二棱镜片73、第二扩散片74以及反射片75。例如，第一棱镜片72和第二棱镜片73可垂直排列以提高背光源的亮度。扩散板使发光效果更加均匀。被量子棒反射的线偏振光经过扩散片后变成非偏振光，再经反射片反射再利用，从而可以进一步提高光的利用率。
当下偏振片64中不包括用于驱动偏振片中的量子棒膜层发光的第一电极和第二电极时，显示面板中还设置有用于提供用于进行显示的背光源66，背光源66设置在下偏振片64背向阵列基板62的一侧，参见图7a。
本发明另一实施例中，还提供一种显示面板，如图7b所示，还包括设置在阵列基板和背光源之间的第一扩散片71、第一棱镜片72、第二棱镜片73、第二扩散片74，以及设置在背光源远离阵列基板一侧的反射片75。被量子棒反射的线偏振光经过扩散片后变成非偏振光，再经反射片反射再利用，从而可以进一步提高光的利用率。
以上以设置两个扩散片、两个棱镜片为例进行说明，需要说明的是，扩散片和棱镜片还可以设置为其他数量，本发明的实施例对此不作限定。
基于同一发明构思，本发明实施例还提供了一种显示装置，显示装置包括如上所述的显示面板。
综上，本发明实施例提供了一种偏振片及其制作方法、显示装置。其中偏振片包括量子棒膜层，量子棒膜层包括多个排列方向一致的量子棒。由于量子棒具有指向性，能够进行线偏振发射，因此量子棒膜层可将经过该层的光转化为偏振光，可避免因采用偏振片所造成的光损失，还提高背光源的利用率，同时还可以提高显示面板的亮度，以实现具有高亮度、高色域的图像显示。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。
本专利申请要求于2016年1月4日递交的中国专利申请第201610004287.4号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (16)

  1. 一种偏振片，包括：衬底基板和位于所述衬底基板一侧的量子棒膜层；其中，所述量子棒膜层包括多个排列方向一致的量子棒。
  2. 如权利要求1所述的偏振片，其中，所述量子棒的长轴方向平行于所述衬底基板，所述量子棒的长轴方向排列一致。
  3. 如权利要求1所述的偏振片，还包括位于所述量子棒膜层远离所述衬底基板的一侧的第一电极；以及，位于所述量子棒膜层靠近所述衬底基板的一侧的第二电极。
  4. 如权利要求1-3任一项所述的偏振片，还包括位于所述量子棒膜层远离所述衬底基板的一侧的平坦层。
  5. 如权利要求1-3任一项所述的偏振片，其中，所述量子棒膜层采用硒化镉、硫化镉、硫化锌、硒化锌、硫化钙和硒化钙中的任一种材料制作。
  6. 一种显示装置，包括显示面板，所述显示面板包括彩膜基板、阵列基板、设置在所述彩膜基板和阵列基板之间的液晶层、设置在所述彩膜基板远离所述液晶层的一侧的上偏振片、以及设置在所述阵列基板远离所述液晶层的一侧的下偏振片，其中，至少所述下偏振片为权利要求1-5任一项所述的偏振片。
  7. 一种偏振片的制作方法，包括：在衬底基板上形成包括量子棒膜层的图形；其中，所述量子棒膜层包括多个排列方向一致的量子棒。
  8. 如权利要求7所述的方法，其中，所述量子棒的长轴方向平行于所述衬底基板，所述量子棒的长轴方向排列一致。
  9. 如权利要求7所述的方法，其中，采用涂布或晶体生长的方式形成所述量子棒膜层。
  10. 如权利要求9所述方法，其中，采用晶体生长的方式形成所述量子棒膜层，包括：
    在反应腔内生成量子棒膜层；
    将所述反应腔内的量子棒膜层转印到所述衬底基板上。
  11. 如权利要求10所述方法，还包括对转印到衬底部件上的量子棒膜层做平坦化处理，使得所述量子棒膜层具有平整的表面。
  12. 如权利要求9所述方法，其中，采用涂布的方式形成所述量子棒膜层，包括：
    将包含量子棒的混合溶液涂布在所述衬底基板上，形成一溶液涂层；
    对所述溶液涂层进行预固化，使所述溶液涂层中溶液的粘稠度符合纳米压印工艺的需求；
    对预固化后的溶液涂层采用纳米压印工艺进行压印，形成包括规则排布的量子棒的量子棒膜层。
  13. 如权利要求12所述方法，还包括对所述量子棒膜层做平坦化处理，使得所述量子棒膜层具有平整的表面。
  14. 如权利要求12或13所述方法，其中，所述混合溶液中量子棒含量为1％～5％。
  15. 如权利要求12或13所述方法，其中，所述混合溶液还包括有机溶剂和固化材料。
  16. 如权利要求15所述方法，其中，所述混合溶液中有机溶剂的含量为60％～80％。
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