WO2015010369A1 - 彩膜基板、液晶显示屏及单色量子点的分散方法 - Google Patents

彩膜基板、液晶显示屏及单色量子点的分散方法 Download PDF

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WO2015010369A1
WO2015010369A1 PCT/CN2013/084971 CN2013084971W WO2015010369A1 WO 2015010369 A1 WO2015010369 A1 WO 2015010369A1 CN 2013084971 W CN2013084971 W CN 2013084971W WO 2015010369 A1 WO2015010369 A1 WO 2015010369A1
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layer
liquid crystal
quantum dot
color
substrate
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English (en)
French (fr)
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郭仁炜
董学
肖昂
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BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
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Priority to US14/360,517 priority Critical patent/US9354465B2/en
Publication of WO2015010369A1 publication Critical patent/WO2015010369A1/zh
Anticipated expiration legal-status Critical
Priority to US15/062,747 priority patent/US9851601B2/en
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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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G02F1/133516—Methods for their manufacture, e.g. printing, electro-deposition or photolithography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/007—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/201—Filters in the form of arrays
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures

Definitions

  • Embodiments of the present invention relate to a color film substrate, a liquid crystal display, a display device, and a method of dispersing monochromatic quantum dots. Background technique
  • Quantum Dots also known as nanocrystals, are nanoparticles composed of II-VI or III-V elements.
  • the quantum dots generally have a particle size between 1 and 20 nm. Since the electrons and holes are quantum confined, the continuous band structure becomes a discrete energy level structure, so that the quantum dots can be excited to emit fluorescence.
  • the emission of a quantum dot can be controlled by changing the size of the quantum dot. By changing the size of the quantum dot and its chemical composition, it can emit its optical language covering the entire visible region. Taking CdTe quantum dots as an example, when its particle size grows from 2.5 nm to 4.0 nm, their emission wavelengths can be red shifted from 510 nm to 660 nm.
  • quantum dots can be used as molecular probes for fluorescent labeling by using the luminescent properties of quantum dots, and can also be applied to display devices, such as a monochromatic quantum dot as a light source of a backlight module of a liquid crystal display, monochrome.
  • the quantum dots emit a monochromatic light and a blue light to form a white background light after being excited by, for example, a blue LED.
  • the backlight has a large color gamut and can improve picture quality.
  • Embodiments of the present invention provide a color film substrate, a liquid crystal display, a display device, and a method for dispersing monochrome quantum dots, which are used to improve the color gamut of a display screen, thereby improving picture quality.
  • An embodiment of the present invention provides a color filter substrate, comprising: a substrate substrate; a plurality of pixels disposed on the substrate of the village, each pixel being formed by a plurality of sub-pixels of different colors; comprising a monochrome quantum dot a stacked structure, the stacked structure being disposed at a sub-pixel of at least one color of each pixel
  • the laminate structure is composed of a layer of a graphene layer and a monochromatic quantum dot layer alternately stacked.
  • the bottom layer and the top layer of the laminated structure are all flake graphene layers; the monochromatic quantum dots emit monochromatic light corresponding to the sub-pixel color after being excited by light.
  • the color film substrate may further include: a protective layer covering the laminated structure.
  • Another embodiment of the present invention further provides a liquid crystal display panel, including: a color filter substrate, an array substrate, and a liquid crystal layer between the color filter substrate and the array substrate, wherein the color filter substrate is Color film substrate.
  • the liquid crystal display may further include: a lower polarizing plate located on a side of the array substrate facing away from the liquid crystal layer, and located in the color film substrate The laminated structure faces the upper polarizing plate on one side of the liquid crystal layer.
  • the method further includes: a backlight module that emits blue light or ultraviolet light on a side of the array substrate facing away from the liquid crystal layer.
  • Still another embodiment of the present invention provides a display device including the above liquid crystal display provided by the embodiment of the present invention.
  • Still another embodiment of the present invention provides a method for dispersing a monochromatic quantum dot, comprising: forming a first flake graphene layer on a substrate of a village; and transferring the first flake graphite by means of transfer A pattern of a monochromatic quantum dot layer is formed on the olefin layer; and a second flaky graphene layer is formed on the monochromatic quantum dot layer.
  • the first flake graphene layer or the second flake graphene layer is formed according to the following steps: mixing graphene powder, ethyl cellulose and an organic solvent to obtain a mixed solution Applying the mixed solution to the substrate of the substrate or the monochromatic quantum dot layer; removing the organic solvent and the ethyl cellulose in the mixed solution by drying and heating, thereby forming the formed solution A first flake graphene layer on the substrate substrate or a second flake graphene layer formed on the monochromatic quantum dot layer.
  • the graphite powder in the above method accounts for 1%-10% by mass of the ethyl cellulose; the sum of the graphene powder and the ethyl cellulose accounts for the organic
  • the mass percentage of the solvent is from 20% to 50%.
  • the organic solvent in the above method may be ethanol.
  • the pattern of the color quantum dot layer includes: immersing the transfer plate in a monochromatic quantum dot solution; transferring the transfer carrying the monochromatic quantum dot solution on the first flake graphene layer of the substrate substrate a monochromatic quantum dot solution coated on the first flake graphene layer to obtain a pattern of a monochromatic quantum dot layer formed on the first flake graphene layer.
  • FIG. 1 is a schematic structural diagram of a color filter substrate according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a laminated structure in a color filter substrate according to an embodiment of the present invention
  • FIG. 3 is a schematic structural view of a liquid crystal display according to an embodiment of the present invention
  • 4a-4g are schematic structural views of steps of preparing a color filter substrate in a liquid crystal display according to an embodiment of the present invention.
  • FIG. 5 is a schematic flow chart of a method for dispersing a monochromatic quantum dot according to an embodiment of the present invention
  • FIG. 6a to FIG. 6h are schematic diagrams showing steps of a method for dispersing a monochromatic quantum dot according to an embodiment of the present invention. detailed description
  • each film layer in the drawings does not reflect the true ratio of the array substrate or the color filter substrate, and the purpose is only to illustrate the contents of the present invention.
  • a color film substrate provided by an embodiment of the present invention includes a substrate substrate 01 and a black matrix 02 disposed on the substrate substrate 01.
  • the pattern of the black matrix 02 is separated on the substrate substrate 01.
  • a plurality of sub-pixel regions (only one sub-pixel region is illustrated in FIG. 1), and each adjacent plurality of (two or more) sub-pixel regions constitute one pixel region.
  • the substrate of the village is, for example, a glass substrate or a plastic substrate.
  • the black matrix 02 is made of, for example, a black resin material or a metal oxide.
  • each pixel region includes three sub-pixel regions of red, green, and blue.
  • the color filter substrate further includes: a laminated structure 03 comprising monochromatic quantum dots, the laminated structure 03 being disposed in a sub-pixel region of at least one color of each pixel region.
  • the laminated structure 03 is composed of a combination of a sheet-like graphene layer 031 and a monochromatic quantum dot layer 032.
  • the bottom layer and the top layer of the laminated structure 03 are all the flake graphene layer 031; the monochromatic quantum dots in the monochromatic quantum dot layer 032 emit monochromatic light corresponding to the sub-pixel color after being excited by light, such as red light, green light, etc.
  • the laminated structure 03 comprises a three-layered sheet-like graphene layer 031 and two layers of monochromatic quantum dot layers 032, each of which is sandwiched between two sheets of graphene layers 031.
  • a stacked structure including monochromatic quantum dots is used instead of the existing color resin as a color filter to convert the backlight into monochromatic light; due to the monochromatic quantum dot emission spectrum Narrow and high luminous efficiency, the backlight can be efficiently converted into monochromatic light, which can improve the color gamut of the liquid crystal display, enhance the color saturation, and improve the display quality of the display.
  • the monochromatic quantum dots can be uniformly: between adjacent flaky graphene layers 031, such as Figure 2 shows. This prevents the accumulation of monochromatic quantum dots and enhances the quantum yield of quantum dots to improve quantum excitation efficiency.
  • the flake graphene layer 031 is arranged in a plane of a single layer of carbon atoms and has a two-dimensional network structure. Therefore, the flake graphene layer 031 itself is transparent, and does not affect the liquid crystal display. The normal display of the screen.
  • the stacked structure including the monochromatic quantum dots in the embodiment of the present invention means that the quantum dots of the sub-pixels of the same color are the same, and the quantum dots of the sub-pixels of different colors are different.
  • the difference may be a quantum dot size or a material, etc., as long as the quantum dots corresponding to the sub-pixels of the respective colors are excited to emit only the monochromatic light corresponding to the sub-pixel color. That is to say, the quantum dots of each sub-pixel region of the stacked structure including the monochromatic quantum dots can only emit monochromatic light after being excited, but the monochromatic light emitted by the region corresponding to the sub-pixel region of different colors is different.
  • a conventional quantum dot material can be used.
  • the quantum dot material can be sulfurized, oxidized, gallium nitride, bismuth, cadmium, gallium antimonide, cadmium telluride, bismuth cadmium, cadmium telluride. At least one of gallium arsenide, indium phosphide, and lead telluride.
  • the material of the quantum dot includes but is not limited Other materials having the same or similar materials as those described above are also applicable to the above-listed materials.
  • the quantum dots emitting red light are mainly about 9-10 nm
  • the size of the emitted yellow light quantum dots is about 8 nm
  • the size of the quantum dots emitting green light is about 7 nm.
  • the color film substrate provided in the embodiment of the present invention may further include overlying the laminated structure 03.
  • the protective layer 04 is generally formed of an organic resin material, which avoids the contact of the monochromatic quantum dots with oxygen and water, and increases the service life of the monochromatic quantum dots.
  • a pattern of the black matrix 02 is generally formed on the substrate substrate 01, and the pattern of the black matrix 02 separates a plurality of sub-pixel regions on the substrate substrate 01.
  • a flat layer 05 filled in a hollow region that is, a sub-pixel region in the black matrix 02 pattern, may be provided, which is flat.
  • the layer 05 can flatten the surface of the substrate substrate 01.
  • the flat layer 05 can be prepared using a resin material.
  • FIG. 3 Another embodiment of the present invention further provides a liquid crystal display, as shown in FIG. 3, comprising: a color filter substrate 100, an array substrate 200, and a liquid crystal layer 300 between the color filter substrate 100 and the array substrate 200,
  • the color filter substrate 100 is the color film substrate provided by the embodiment of the present invention
  • the array substrate 200 includes, for example, an array of sub-pixel regions corresponding to the array of sub-pixel regions of the color filter substrate 100.
  • the pixel electrode of each sub-pixel region of the array substrate 200 is used to form an electric field to control the degree of rotation of the liquid crystal material to perform a display operation.
  • the array substrate 100 and the color filter substrate 200 are opposed to each other, and are bonded together by a sealant to form a liquid crystal cell in which a liquid crystal material is filled.
  • the above liquid crystal display provided by the embodiment of the present invention can be applied to various modes, for example, an advanced super-dimensional field switch (ADSDS, ADVANCED Super Dimension Switch) type liquid crystal display capable of realizing a wide viewing angle, and the like, and can also be applied to a conventional The twisted nematic (TN, Twisted Nematic) type liquid crystal display, etc., is not limited herein.
  • ADSDS advanced super-dimensional field switch
  • ADVANCED Super Dimension Switch ADVANCED Super Dimension Switch
  • an ADSDS type liquid crystal display is taken as an example for description.
  • the color filter substrate may further include a common electrode layer located on a side facing the liquid crystal layer for use with a pixel electrode on the array substrate The combination forms an electric field that drives the liquid crystal material.
  • the liquid crystal display panel may further include: a lower polarizing plate 12 located on the side of the array substrate 2 facing away from the liquid crystal layer 300, and a laminated structure 03 located in the color filter substrate 100 facing the liquid crystal layer
  • the upper polarizing plate 09 on one side of the 300.
  • the lower polarizing plate 12 of the array substrate 200 facing away from the liquid crystal layer 300 can be prepared by a polarizing plate process and material attached to a conventional liquid crystal display, and will not be described herein.
  • the upper polarizing plate 09 can be prepared by using an azo-based photosensitive resin, and then irradiated by directional ultraviolet light, and finally washed by iodine solvent to obtain a film having a polarizing effect.
  • the upper polarizing plate 09 included in the liquid crystal display panel provided by the embodiment of the present invention may be prepared, for example, by being attached to the side of the color filter substrate 100 facing away from the liquid crystal layer 300, for example, the array substrate 200 may be used.
  • the same process and material preparation as the back side of the liquid crystal layer 300 to which the polarizing plate is attached is not limited herein.
  • the backlight module 400 may be further disposed on the side of the array substrate 200 facing away from the liquid crystal layer 300.
  • the backlight module 400 emits blue light, and the center wavelength of the blue light is preferably 450 nm.
  • the monochromatic quantum dots in the stacked structure of the color filter substrate 100 are excited to emit corresponding monochromatic light.
  • near-ultraviolet light can also be used as the backlight for exciting the quantum dots, which is not limited herein.
  • the blue light emitted by the backlight module 400 is modulated by the lower polarizing plate 12 and the liquid crystal layer 300, and then irradiated to the upper polarizing plate 09, and the upper polarizing plate 09 is polarized.
  • the action of the layer is then applied to the stacked structure 03 containing monochromatic quantum dots, and the monochromatic quantum dots in each of the stacked structures 03 are excited by the backlight to generate corresponding monochromatic light to realize color liquid crystal display.
  • the preparation process of the color filter substrate 100 provided with the upper polarizing plate 09 will be described below, and the preparation process includes the following steps:
  • a column spacer 07 (PS) is formed on the passivation layer 06 as shown in Fig. 4g.
  • the embodiment of the present invention further provides a method for distributing monochromatic quantum dots, as shown in FIG. 5, which includes the following steps:
  • the first flake graphene layer in step S501 and the second flake graphene layer in step S503 may be formed according to the following steps:
  • a graphene powder, ethyl cellulose, and an organic solvent are mixed to obtain a mixed solution.
  • the graphene powder accounts for 1% to 10% by mass of the ethyl cellulose; the sum of the graphite powder and the ethyl cellulose accounts for 20% to 50% by mass of the organic solvent.
  • the organic solvent is ethanol, and of course, it may be other commonly used organic solvents, which is not limited herein.
  • graphene powder and ethyl cellulose may be added first in an organic solvent. Then, the organic solvent to which the graphite powder and ethyl cellulose are added is placed in an oven and dissolved at 80 to 100 ° C; preferably, the dissolution is carried out at 90 °C. Finally, after the graphite powder and ethyl cellulose are dissolved, the organic solvent in which the graphene powder and the ethyl cellulose are dissolved is ultrasonicated to obtain the mixed solution.
  • Fig. 6b shows the formation of a first flake graphene layer 0311 on the substrate substrate 01.
  • the substrate substrate coated with the mixed solution may be first dried in an oven at 80-100 ° C for 12 hours; preferably, dried at 90 ° C; then, the oven is heated to 400 ° C left Heating to the right for 8 hours; finally, it is naturally cooled to room temperature, at which time the graphite gradually forms a layer and is converted into a transparent form.
  • the above steps can be carried out in a dust-free environment.
  • the pattern of forming a monochromatic quantum dot layer on the first flake graphene layer in step S502 can be realized by the following steps:
  • the transfer plate 10 is immersed in the monochromatic quantum dot solution 11, as shown in Fig. 6c.
  • the content of the monochromatic quantum dots is 0.1 to 5% by weight, and the solvent may be cyclohexane or other highly polar solvent such as toluene, ethyl acetate or benzene.
  • the monochromatic quantum dot solution can be ultrasonically dispersed for about 3 hours.
  • Embodiments of the present invention also provide a display device including the foregoing liquid crystal display and a driving circuit working therewith. Since the principle of solving the problem of the device is similar to that of the foregoing liquid crystal display, the implementation of the device can be referred to the implementation of the liquid crystal display, and the repeated description will not be repeated.
  • a color film substrate, a liquid crystal display panel, a display device, and a method for dispersing a monochrome quantum dot are provided in an embodiment of the present invention, wherein a sub-pixel region of at least one color of each pixel on a color filter substrate is provided with a monochrome quantum dot Laminated structure.
  • the laminated structure is composed of a laminar graphene layer and a monochromatic quantum dot layer alternately stacked, and the bottom layer and the top layer of the laminated structure are flake graphene layers; the monochromatic quantum dots emit corresponding sub-pixel colors after being excited by light. Monochrome light.
  • Embodiments of the present invention use a stacked structure including monochromatic quantum dots instead of the existing colored resin as a color filter to convert background light into monochromatic light. Since the quantum dot emission spectrum is narrow and the luminous efficiency is high, the background light can be efficiently used. The ground is converted into monochromatic light, which can improve the color gamut of the liquid crystal display, enhance the color saturation, and improve the display quality of the display. Moreover, by using a combination of a flake graphene layer and a monochromatic quantum dot layer to form a laminated structure, monochromatic quantum dots can be uniformly dispersed between adjacent flake graphene layers to prevent monochromatic quantum dots. accumulation, Increasing the quantum yield of quantum dots to improve quantum excitation efficiency.

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Abstract

一种彩膜基板，在彩膜基板上的各像素的至少一个颜色的亚像素的区域设置有包含单色量子点的叠层结构（03）；叠层结构（03）由片状石墨烯层（031）和单色量子点层（032）交替层叠组成。彩膜基板可以将背景光高效地转化为单色光，能提高液晶显示屏的色域，增强了色彩饱和度，提高了显示屏的显示品质。

Description

彩膜基板、 液晶显示屏及单色量子点的分散方法 技术领域
本发明的实施例涉及一种彩膜基板、 液晶显示屏、 显示装置及单色量子 点的分散方法。 背景技术
量子点 (Quantum Dots) , 又可以称纳米晶， 是一种由 II - VI族或 III - V 族元素组成的纳米颗粒。 量子点的粒径一般介于 1 ~ 20nm之间。 由于电子和 空穴被量子限域， 连续的能带结构变成具有分立的能级结构， 所以量子点受 激后可以发射荧光。
量子点的发射光语可以通过改变量子点的尺寸大小来控制。 通过改变量 子点的尺寸和它的化学组成可以使其发射光语覆盖整个可见光区。 以 CdTe 量子点为例， 当它的粒径从 2.5nm生长到 4.0nm时， 它们的发射波长可以从 510nm红移到 660nm。
目前， 利用量子点的发光特性， 可以将量子点作为分子探针应用于荧光 标记， 也可以应用于显示器件中， 例如将单色量子点作为液晶显示屏的背光 模组的发光源，单色量子点在受到例如蓝光 LED激发后发出单色光与蓝光混 合形成白色背景光， 该背光源具有较大的色域， 能提高画面品质。
由于纳米级的量子点在有机溶剂中分散性不好， 在之后制成图案 ( Pattern ) 时会出现量子点堆积而产生淬灭现象， 这严重降低了量子产率， 因此， 目前还没有将量子点应用于液晶显示屏内部的设计。 发明内容
本发明实施例提供了一种彩膜基板、 液晶显示屏、 显示装置及单色量子 点的分散方法， 用以提高显示屏的色域， 进而提高画面品质。
本发明的一个实施例提供了一种彩膜基板， 包括： 村底基板； 设置在所 述村底基板上多个像素， 每个像素由多个不同颜色的亚像素形成； 包含单色 量子点的叠层结构， 所述叠层结构设置在各像素的至少一个颜色的亚像素的 区域中， 且所述叠层结构由片状石墨烯层和单色量子点层交替层叠组成。 所 述叠层结构的底层和顶层均为片状石墨烯层； 所述单色量子点在受光激发后 发出对应所述亚像素颜色的单色光。
例如， 进一步地， 为了增加单色量子点的使用寿命， 在上述彩膜基板中， 还可以包括： 覆盖在所述叠层结构上的保护层。
本发明的另一个实施例还提供了一种液晶显示屏， 包括： 彩膜基板、 阵 列基板， 以及位于所述彩膜基板和所述阵列基板之间的液晶层， 所述彩膜基 板为上述的彩膜基板。
例如， 进一步地， 为了使液晶显示屏能够正常显示， 在上述液晶显示屏 中， 还可以包括： 位于所述阵列基板背向液晶层一侧的下偏振片， 以及位于 所述彩膜基板中的叠层结构面向液晶层的一侧的上偏振片。
例如， 进一步地， 为了使液晶显示屏能够正常显示， 还可以包括： 位于 所述阵列基板背离所述液晶层一侧的发射蓝光或紫外光的背光模组。
本发明的再一个实施例还提供了一种显示装置， 包括本发明实施例提供 的上述液晶显示屏。
本发明的再一个实施例还提供了一种单色量子点的分散方法， 包括： 在 村底基板上形成第一片状石墨烯层； 利用转印的方式， 在所述第一片状石墨 烯层上形成单色量子点层的图形； 在所述单色量子点层上形成第二片状石墨 烯层。
例如， 进一步地， 在上述方法中根据以下步骤形成所述第一片状石墨烯 层或第二片状石墨烯层： 将石墨烯粉料、 乙基纤维素和有机溶剂进行混合， 得到混合溶液;将所述混合溶液涂覆到所述村底基板或所述单色量子点层上； 采用烘干加热的方式， 去除所述混合溶液中的有机溶剂以及乙基纤维素， 得 到形成在所述村底基板上的第一片状石墨烯层或形成在所述单色量子点层上 的第二片状石墨烯层。
例如， 进一步地， 在上述方法中的所述石墨婦粉末占所述乙基纤维素的 质量百分比为 1%-10%； 所述石墨烯粉末和所述乙基纤维素之和占所述有机 溶剂的质量百分比为 20%-50%。
例如， 进一步地， 在上述方法中的有机溶剂可以为乙醇。
例如， 进一步地， 在上述方法中所述在所述第一片状石墨烯层上形成单 色量子点层的图形， 包括： 将转印版浸泡在单色量子点溶液中； 在所述村底 基板的第一片状石墨烯层上， 转印携带有单色量子点溶液的转印版； 烘干涂 覆在所述第一片状石墨烯层上的单色量子点溶液， 得到形成在所述第一片状 石墨烯层上的单色量子点层的图形。 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 筒单地介绍，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 1为本发明实施例提供的彩膜基板的结构示意图；
图 2为本发明实施例提供的彩膜基板中的叠层结构的结构示意图； 图 3为本发明实施例提供的液晶显示屏的结构示意图；
图 4a-图 4g为本发明实施例提供的液晶显示屏中制备彩膜基板的各步骤 的结构示意图；
图 5为本发明实施例提供的单色量子点的分散方法的流程示意图； 图 6a-图 6h为本发明实施例提供的单色量子点的分散方法的各步骤的示 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。
下面对本发明实施例提供的彩膜基板、 液晶显示屏、 显示装置及单色量 子点的分散方法的具体实施方式进行详细地说明。
附图中各膜层的形状和大小并不反映阵列基板或彩膜基板的真实比例， 目的只是示意说明本发明内容。
本发明实施例提供的一种彩膜基板，如图 1所示， 包括村底基板 01和设 置在村底基板 01上的黑矩阵 02, 黑矩阵 02的图形在村底基板 01上分隔出 多个亚像素区域（图 1中仅示意出一个亚像素区域） ， 且每相邻的多个（两 个或以上）亚像素区域组成一个像素区域。 该村底基板例如为玻璃基板或塑 料基板。 该黑矩阵 02例如由黑色的树脂材料或金属氧化物制备。 例如，每个 像素区域包括红、 绿和蓝三个亚像素区域。
该彩膜基板还包括： 包含单色量子点的叠层结构 03 , 该叠层结构 03设 置在各像素区域的至少一个颜色的亚像素区域。该叠层结构 03由片状石墨烯 层 031和单色量子点层 032交替层叠组成。叠层结构 03的底层和顶层均为片 状石墨烯层 031 ; 单色量子点层 032中的单色量子点在受光激发后发出对应 亚像素颜色的单色光， 例如红光、 绿光等。 例如， 叠层结构 03包含三层片状 石墨烯层 031和两层单色量子点层 032, 该两层单色量子点层 032各自被夹 置在两层片状石墨烯层 031之间。
本发明实施例提供的上述彩膜基板中， 采用包含单色量子点的叠层结构 代替现有的彩色树脂作为彩色滤光片， 以将背光转化成单色光； 由于单色量 子点发射光谱窄并且发光效率高， 可以将背光高效地转化为单色光， 能提高 液晶显示屏的色域， 增强了色彩饱和度， 提高了显示屏的显示品质。
并且， 采用片状石墨烯层 031和单色量子点层 032交替层叠组成叠层结 构 03的方式，可以使单色量子点均匀地^:于相邻的片状石墨烯层 031之间， 如图 2所示。 这样可以防止单色量子点的堆积， 增强量子点的量子产率， 以 提高量子激发光效。 另外， 如图 2所示， 片状石墨烯层 031成单层碳原子平 面排列， 具有二维网状结构的特点， 因此， 片状石墨烯层 031本身也是透明 的， 不会影响到液晶显示屏的正常显示。
需要说明的是， 本发明实施例所述的包含单色量子点的叠层结构是指在 同种颜色的亚像素的量子点是相同的，不同颜色的亚像素的量子点是不同的， 此处不同可以是量子点尺寸或者材料等的不同， 只要保证对应各个颜色的亚 像素的量子点受激发后仅发出对应该亚像素颜色的单色光即可。 也就是说， 所述包含单色量子点的叠层结构各个亚像素区域的量子点受激发后都仅能发 出单色光， 但对应不同颜色的亚像素区域的区域其发出的单色光是不同的。
本实施例可以采用传统的量子点材料， 该量子点材料可以为硫化辞、 氧 化辞、 氮化镓、 踊化辞、 充化镉、 踊化镓、 踊化镉、 碲化辞、 碲化镉、 砷化 镓、 磷化铟、 碲化铅中的至少一种。 当然， 该量子点的材料包括但并不局限 于上述列举出来的几种， 具有与上述物质具有相同或相似的其他材料也同样 可以适用。以硫化辞（ ZnS )量子点为例，发射红光的量子点尺寸主要在约 9 ~ 10nm, 发射黄光量子点尺寸约 8 nm, 发射绿光的量子点尺寸在约 7nm。
进一步地，为了避免叠层结构 03中的单色量子点层 032与空气接触，在 本发明实施例提供的上述彩膜基板中， 如图 1所示， 还可以包括覆盖在叠层 结构 03上的保护层 04。 该保护层 04—般采用有机树脂材料形成， 可以避免 单色量子点与氧气和水接触， 增加了单色量子点的使用寿命。
在形成彩膜基板的各膜层的过程中，一般会在村底基板 01上先形成黑矩 阵 02的图形，该黑矩阵 02的图形会在村底基板 01上分隔出多个亚像素区域， 以避免混光影响显示效果。 在一个示例中， 为了便于后续形成的片状石墨烯 在同一水平面上的连续性，如图 1所示，可以设置填充于黑矩阵 02图形中镂 空区域即亚像素区域的平坦层 05,该平坦层 05可以将村底基板 01的表面铺 平。 例如， 该平坦层 05可以采用树脂材料制备。
本发明的另一个实施例还提供了一种液晶显示屏， 如图 3所示， 包括： 彩膜基板 100、阵列基板 200, 以及位于彩膜基板 100和阵列基板 200之间的 液晶层 300, 该彩膜基板 100为本发明实施例提供的上述彩膜基板， 而阵列 基板 200例如包括与彩膜基板 100的亚像素区域的阵列相对应的亚像素区域 的阵列。 阵列基板 200的每个亚像素区域的像素电极用于形成电场对液晶材 料的旋转的程度进行控制从而进行显示操作。 阵列基板 100与彩膜基板 200 彼此对置， 并通过封框胶结合在一起以形成液晶盒， 在液晶盒中填充液晶材 料。 二者之间并且可以通过隔垫物 （柱状隔垫物或球状隔垫物）分隔以保持 一定间距。 由于该液晶显示屏解决问题的原理与前述一种彩膜基板相似， 因 此， 该液晶显示屏的实例可参见其的实施， 重复之处不再赘述。
本发明实施例提供的上述液晶显示屏可以适用于各种模式， 例如可以适 用于能够实现宽视角的高级超维场开关（ ADSDS, ADvanced Super Dimension Switch ) 型液晶显示屏等， 也可以适用于传统的扭曲向列 （TN , Twisted Nematic )型液晶显示屏等， 在此不做限定。
例如， 本发明实施例提供的上述液晶显示屏中以 ADSDS型液晶显示屏 为例进行说明。 例如， 对于 TN型液晶显示屏， 彩膜基板还可以包括公共电 极层， 该公共电极层位于朝向液晶层的一侧， 用于与阵列基板上的像素电极 配合形成驱动液晶材料的电场。
例如， 上述液晶显示屏， 如图 3所示， 还可以包括： 位于阵列基板 2背 向液晶层 300—侧的下偏振片 12,以及位于彩膜基板 100中的叠层结构结构 03面向液晶层 300的一侧的上偏振片 09。阵列基板 200背向液晶层 300—侧 的下偏振片 12可以采用传统液晶显示屏中贴附的偏振片工艺和材料制备,此 处不再赘述。
例如，该上偏振片 09可以采用偶氮类光敏树脂制备，然后通过定向紫外 光照射后， 最后通过碘溶剂洗涤的方式， 得到具有偏振效果的薄膜。
此外，本发明实施例提供的上述液晶显示屏中包含的上偏振片 09,例如， 也可以采用贴附于彩膜基板 100背离液晶层 300—侧的方式制备， 例如可以 采用与在阵列基板 200背向液晶层 300—侧贴附下偏振片相同的工艺和材料 制备， 在此不做限定。
本发明实施例提供的液晶显示屏中，在位于阵列基板 200背离液晶层 300 一侧还可以具有背光模组 400, 例如， 该背光模组 400发射蓝光， 该蓝光的 中心波长为 450nm为佳，以便彩膜基板 100的叠层结构结构中的单色量子点 被激发后发出对应的单色光。 当然， 根据实际选用的量子点的激发波长， 也 可以选用近紫外光作为激发量子点的背光， 在此不做限定。
本发明实施例提供的上述液晶屏在工作时， 背光模组 400发出的蓝光经 过下偏振片 12以及液晶层 300的调制后， 照射到上偏振片 09, 该上偏振片 09起到偏振起偏层的作用， 然后照射到包含单色量子点的叠层结构 03上， 各叠层结构 03中的单色量子点受到背光激发生成对应的单色光，实现彩色液 晶显示。
例如， 下面对设置有上偏振片 09的彩膜基板 100的制备工艺进行说明， 其制备工艺包括以下几个步骤：
( 1 )在村底基板 01上例如通过印刷或光刻方法形成黑矩阵 02 ( BM ) 的图形， 如图 4a所示；
( 2 )在黑矩阵 02的图形中的镂空区域即亚像素区域上形成平坦层 05 , 如图 4b所示；
( 3 )在平坦层 05上制备包含单色量子点的叠层结构 03,该叠层结构 03 由片状石墨烯层 031和单色量子点层 032交替层叠组成， 如图 4c所示； ( 4 )在叠层结构 03上形成保护层 04, 如图 4d所示；
( 5 )在保护层 04上形成上偏振片 09, 如图 4e所示；
( 6 )在上偏振片 09上形成钝化层 06, 如图 4f所示；
( 7 )在钝化层 06上形成柱状隔垫物 07 ( PS ) , 如图 4g所示。
例如，本发明实施例还提供了一种单色量子点的分散方法，如图 5所示， 其包括以下几个步骤：
5501、 在村底基板上形成第一片状石墨烯层；
5502、 利用转印的方式， 在第一片状石墨烯层上形成单色量子点层的图 形；
S503、 在单色量子点层上形成第二片状石墨烯层。
例如， 步骤 S501中的第一片状石墨烯层和步骤 S503中的第二片状石墨 烯层可以根据下述步骤形成：
( 1 )将石墨烯粉料、 乙基纤维素和有机溶剂进行混合， 得到混合溶液。 石墨烯粉末占乙基纤维素的质量百分比为 1%-10%； 石墨婦粉末和乙基 纤维素之和占有机溶剂的质量百分比为 20%-50%。
例如， 该有机溶剂为乙醇， 当然其也可以是其他常用的有机溶剂， 在此 不#文限定。
例如， 可以先在有机溶剂加入石墨烯粉料和乙基纤维素。 然后， 将加入 石墨婦粉料和乙基纤维素的有机溶剂放置于烘箱中 , 在 80-100°C的条件下进 行溶解； 优选在 90 °C的条件下进行溶解。 最后， 在石墨婦粉料和乙基纤维素 溶解后， 对溶解有石墨烯粉料和乙基纤维素的有机溶剂进行超声处理， 得到 所述混合溶液。
( 2 )将混合溶液涂覆到村底基板或单色量子点层上， 例如图 6a所示为 将混合溶液 08涂覆到村底基板 01上。
( 3 )采用烘干加热的方式，去除混合溶液中的有机溶剂以及乙基纤维素， 得到形成在村底基板上的第一片状石墨烯层或形成在单色量子点层上的第二 片状石墨烯层。 例如， 图 6b所示为在村底基板 01上形成第一片状石墨烯层 0311。
例如，可以先将涂有混合溶液的村底基板放入 80-100°C的烘箱中烘干 12 小时； 优选地， 在 90 °C的条件下进行烘干； 然后， 再将烘箱加温到 400°C左 右加热 8小时； 最后， 自然冷却到室温， 这时石墨逐渐成层， 转化为透明状。 较佳地， 为了避免杂质颗粒落在石墨婦表层， 例如上述这些步骤可在无尘的 环境中进行。
例如， 步骤 S502中的在第一片状石墨烯层上形成单色量子点层的图形， 可以通过下述步骤实现：
( 1 )将转印版 10浸泡在单色量子点溶液 11中， 如图 6c所示。
例如， 在单色量子点溶液中， 单色量子点的含量为 0.1-5wt%, 溶剂可以 为环己烷或其他高极性的溶剂， 例如甲苯、 乙酸乙酯或苯等。 并且， 为了防 止单色量子点出现团聚现象， 单色量子点溶液可以先超声分散 3小时左右。
( 2 )在村底基板 01的第一片状石墨烯层 0311上，转印携带有单色量子 点溶液 11的转印版 10, 如图 6d和图 6e所示。
( 3 )烘干涂覆在第一片状石墨烯层 0311上的单色量子点溶液 11 , 得到 形成在第一片状石墨烯层 0311上的单色量子点层 032的图形，如图 6f所示。 例如， 可以在 100°C的条件下烘干 3小时左右。
然后，重复上述步骤，在第一片状石墨烯层 0311上的其他位置转印不同 的单色量子点层的图形， 如图 6g所示。
最后， 在单色量子点层 032上形成第二片状石墨烯层 0312, 图 6h所示。 本发明实施例还提供了一种显示装置， 包括前述液晶显示屏以及与之配 合工作的驱动电路等。 由于该装置解决问题的原理与前述一种液晶显示屏相 似， 因此该装置的实施可以参见液晶显示屏的实施， 重复之处不再赘述。
本发明实施例提供的一种彩膜基板、 液晶显示屏、 显示装置及单色量子 点的分散方法， 在彩膜基板上的各像素的至少一个颜色的亚像素区域设置有 包含单色量子点的叠层结构。 该叠层结构由片状石墨烯层和单色量子点层交 替层叠组成， 且该叠层结构的底层和顶层均为片状石墨烯层； 单色量子点在 受光激发后发出对应亚像素颜色的单色光。 本发明实施例采用包含单色量子 点的叠层结构代替现有的彩色树脂作为彩色滤光片将背景光转化成单色光， 由于量子点发射光谱窄并且发光效率高，可以将背景光高效地转化为单色光, 能提高液晶显示屏的色域， 增强色彩饱和度，提高显示屏的显示品质。 并且， 采用片状石墨烯层和单色量子点层交替层叠组成叠层结构的方式， 可以使单 色量子点均匀地分散于相邻的片状石墨烯层之间， 防止单色量子点的堆积， 增加量子点的量子产率， 以提高量子激发光效。
以上所述仅是本发明的示范性实施方式， 而非用于限制本发明的保护范 围， 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1、 一种彩膜基板， 包括：
村底基板；
设置在村底基板上的多个像素，每个像素由多个不同颜色的亚像素组成； 包含单色量子点的叠层结构， 所述叠层结构设置在各像素的至少一个颜 色的亚像素对应的区域中， 且所述叠层结构由片状石墨烯层和单色量子点层 交替层叠组成，
其中， 所述叠层结构的底层和顶层均为片状石墨烯层； 所述单色量子点 在受光激发后发出对应所述亚像素颜色的单色光。
2、如权利要求 1所述的彩膜基板，还包括： 覆盖在所述叠层结构上的保 护层。
3、 一种液晶显示屏， 包括： 彩膜基板、 阵列基板， 以及位于所述彩膜基 板和所述阵列基板之间的液晶层， 其中， 所述彩膜基板为如权利要求 1或 2 所述的彩膜基板。
4、如权利要求 3所述的液晶显示屏，还包括： 位于所述阵列基板背向液 晶层一侧的下偏振片， 以及位于所述彩膜基板中的叠层结构面向液晶层的一 侧的上偏振片。
5、如权利要求 3或 4所述的液晶显示屏，还包括： 位于所述阵列基板背 离所述液晶层一侧的背光模组。
6、如权利要求 5所述的液晶显示屏， 其中， 所述背光模组发蓝光或紫外 光。
7、 一种显示装置， 包括如权利要求 3-6中任一项所述的液晶显示屏。
8、 一种单色量子点的分散方法， 包括：
在村底基板上形成第一片状石墨烯层；
利用转印的方式,在所述第一片状石墨烯层上形成单色量子点层的图形； 在所述单色量子点层上形成第二片状石墨烯层。
9、如权利要求 8所述的方法， 其中， 形成所述第一片状石墨烯层或第二 片状石墨烯层包括：
将石墨烯粉料、 乙基纤维素和有机溶剂进行混合， 得到混合溶液； 将所述混合溶液涂覆到所述村底基板或所述单色量子点层上； 烘干以去除所述混合溶液中的有机溶剂以及乙基纤维素， 得到形成在所 述村底基板上的第一片状石墨烯层或形成在所述单色量子点层上的第二片状 石墨婦层。
10、 如权利要求 9所述的方法， 其中， 所述石墨烯粉末占所述乙基纤维 素的质量百分比为 1%-10%； 所述石墨婦粉末和所述乙基纤维素之和占所述 有机溶剂的质量百分比为 20%-50%。
11、 如权利要求 9或 10所述的方法， 其中， 所述有机溶剂为乙醇。
12、 如权利要求 8所述的方法， 其中， 所述在所述第一片状石墨烯层上 形成单色量子点层的图形， 包括：
将转印版浸泡在单色量子点溶液中；
在所述村底基板的第一片状石墨烯层上， 转印携带有单色量子点溶液的 转印版；
烘干涂覆在所述第一片状石墨烯层上的单色量子点溶液， 得到形成在所 述第一片状石墨烯层上的单色量子点层的图形。
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