WO2016101390A1 - 量子点彩色滤光片的制作方法及液晶显示装置 - Google Patents

量子点彩色滤光片的制作方法及液晶显示装置 Download PDF

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WO2016101390A1
WO2016101390A1 PCT/CN2015/072465 CN2015072465W WO2016101390A1 WO 2016101390 A1 WO2016101390 A1 WO 2016101390A1 CN 2015072465 W CN2015072465 W CN 2015072465W WO 2016101390 A1 WO2016101390 A1 WO 2016101390A1
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quantum dot
quantum dots
content
light quantum
green light
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French (fr)
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李吉
马小龙
李泳锐
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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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
    • G02F1/1336—Illuminating devices
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—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 
    • G02F1/015—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 semiconductor elements having potential barriers, e.g. having a PN or PIN junction
    • G02F1/017—Structures with periodic or quasi periodic potential variation, e.g. superlattices, quantum wells
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G02F1/133516—Methods for their manufacture, e.g. printing, electro-deposition or photolithography
    • 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
    • G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
    • G02F2/02—Frequency-changing of light, e.g. by quantum counters
    • 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 
    • G02F1/015—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 semiconductor elements having potential barriers, e.g. having a PN or PIN junction
    • G02F1/017—Structures with periodic or quasi periodic potential variation, e.g. superlattices, quantum wells
    • G02F1/01791—Quantum boxes or quantum dots
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • 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
    • G02F2202/10—Materials and properties semiconductor
    • G02F2202/108—Materials and properties semiconductor quantum wells

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a method for fabricating a quantum dot color filter and a liquid crystal display device.
  • the color of a liquid crystal display is realized by a color filter (CF).
  • the CF layer is formed by a color photoresist material after a series of yellow light processes.
  • a commonly used CF photoresist material is formed by dissolving and dispersing a polymer, a monomer, a photo initator, and a pigment in a solvent.
  • the pigment therein is a substance that causes CF to achieve color.
  • the light emitted from the backlight passes through the RGB CF layer, only the light corresponding to the R, G, and B bands is transmitted, and the light of the other wavelength band is absorbed by the pigment, so that the light passes through the CF layer to generate the RGB color.
  • RGB pigments are R254, R177, G58, B166.
  • these organic pigments have relatively wide transmission peaks and limited color density, making it difficult to achieve a wider color gamut for liquid crystal displays; on the other hand, most of the light passing through CF is absorbed (about 66% loss), Only a small fraction of the light is transmitted, so the utilization of light is extremely low (usually the overall light utilization is less than 5%).
  • Quantum dots are extremely tiny semiconductor nanocrystals composed of zinc, cadmium, selenium and sulfur atoms.
  • the particles in the crystal are less than 10 nm in diameter.
  • quantum dots emit light when excited by electricity or light, and the wavelength of the light is extremely narrow, the color is pure, and the color of the emitted light is determined by the composition of the quantum dots and the size and shape of the diameter. The smaller the size, the more the light is biased toward the blue light, and the larger the color is toward the red light. If the control is accurate, the bright R, G, and B light can be emitted. Therefore, if the quantum dots are applied to the color photoresist material, the brightness of the display screen and the vividness of the screen can be greatly improved, and the energy consumption can be reduced.
  • quantum dot luminescence is a change in the structure of a quantum dot band after being excited by light, and emits light of a specific wavelength. After the backlight in the liquid crystal display passes through the lower polarizer, linearly polarized light is generated in a specific direction. When the linearly polarized light excites the quantum dot, the polarization state of the polarized light in a specific direction changes (depolarization and polarization direction change). Therefore, it leads to uncontrollability of the light path and brightness.
  • An object of the present invention is to provide a method for fabricating a quantum dot color filter, which is simple in process and easy to implement.
  • Another object of the present invention is to provide a liquid crystal display device in which a quantum dot color filter is disposed outside the upper and lower polarizers, thereby avoiding a decrease in the light utilization rate due to a change in the polarization state of the quantum dots, thereby making the liquid crystal
  • the display device has a wider color gamut and higher brightness while saving energy.
  • the present invention provides a method for fabricating a quantum dot color filter, comprising the following steps:
  • Step 1 The Bewendi method is used to synthesize quantum dots having a core-shell structure, and quantum dots having different particle sizes are obtained by changing synthesis conditions in the preparation process, including red light quantum dots and green light quantum dots, and the red light quantum dots are granulated.
  • the diameter of the green light quantum dot is 3 to 5 nm;
  • Step 2 treating the surface of the red light quantum dot and the green light quantum dot by a dispersing agent to stably disperse the red light quantum dot and the green light quantum dot; and obtaining a stabilized red light quantum dot and a green light quantum dot;
  • Step 3 dispersing and stabilizing the stabilized red light and green light quantum dots with a resin, a monomer, a photoinitiator, and an additive, respectively, to form a photosensitive dispersion liquid containing red and green light quantum dots;
  • Step 4 Form a pixel pattern by using the photosensitive dispersion containing red light and green light quantum dots.
  • the quantum dots have a particle diameter ranging from 3 to 8 nm
  • the red light quantum dots have a particle diameter of 5 to 7 nm
  • the green light quantum dots have a particle diameter of 3 to 5 nm.
  • the preparation process of the quantum dots in the step 1 includes:
  • Step 11 Preparing a CdS core of the quantum dot
  • Step 12 Prepare a ZnS shell coated on the outside of the CdS core.
  • the red light quantum dot-containing photosensitive dispersion liquid has a content of the stabilized red light quantum dots of 5 to 20% by weight based on the total weight of the photosensitive dispersion liquid, and the content of the resin is 2 to 15% by weight, the content of the monomer is 3 to 10% by weight, the content of the photoinitiator is 0.1 to 0.6% by weight, the content of the additive is 0.1 to 2% by weight, and the content of the solvent is 70 to 90wt%;
  • the content of the monomer is from 3 to 10% by weight
  • the content of the photoinitiator is from 0.1 to 0.6% by weight
  • the content of the additive is from 0.1 to 2% by weight
  • the content of the solvent is from 70 to 90% by weight.
  • the dispersing agent in the step 2 is a small molecule coupling agent or an amphiphilic polymer coupling agent.
  • the resin in the step 3 is a polyacrylate polymer, and the monomer is polyhydroxy propylene.
  • An acid ester monomer wherein the solvent is a mixed solvent of one or more of propylene glycol monomethyl ether acetate; the photoinitiator is acetophenone, biimidazole, benzoin or benzophenone
  • the additive is at least one of a leveling agent, an antifoaming agent, and a heat stabilizer.
  • the step 4 forms a pixel pattern by spraying or patterning.
  • the present invention also provides a liquid crystal display device including a liquid crystal panel and a backlight module disposed under the liquid crystal panel, the liquid crystal panel including a first substrate and a second substrate disposed opposite to each other, and disposed on the first substrate a liquid crystal layer between the second substrates, an upper polarizing plate disposed on a side of the first substrate away from the liquid crystal layer, a lower polarizing plate disposed on a side of the second substrate away from the liquid crystal layer, and A quantum dot color filter between the backlight module and the lower polarizer.
  • the backlight module is a blue fluorescent light source, and a side of the quantum dot color filter adjacent to the lower polarizing plate is provided with a red light quantum dot pixel pattern and a green light quantum dot pixel pattern.
  • the invention also provides a method for manufacturing a quantum dot color filter, comprising the following steps:
  • Step 1 The Bewendi method is used to synthesize quantum dots with core-shell structure.
  • quantum dots with different particle sizes are obtained by changing the synthesis conditions, including red light quantum dots and green light quantum dots.
  • Step 2 treating the surface of the red light quantum dot and the green light quantum dot by a dispersing agent to stably disperse the red light quantum dot and the green light quantum dot; and obtaining a stabilized red light quantum dot and a green light quantum dot;
  • Step 3 dispersing and stabilizing the stabilized red light and green light quantum dots with a resin, a monomer, a photoinitiator, and an additive, respectively, to form a photosensitive dispersion liquid containing red and green light quantum dots;
  • Step 4 forming a pixel pattern by using the photosensitive dispersion containing red light and green light quantum dots;
  • the quantum dot has a particle size ranging from 3 to 8 nm, the red light quantum dot has a particle diameter of 5 to 7 nm, and the green light quantum dot has a particle diameter of 3 to 5 nm;
  • the preparation process of the quantum dots in the step 1 includes:
  • Step 11 Preparing a CdS core of the quantum dot
  • Step 12 preparing a ZnS shell coated on the outside of the CdS core
  • the red light quantum dot-containing photosensitive dispersion liquid has a content of the stabilized red light quantum dots of 5 to 20 wt% based on the total weight of the photosensitive dispersion liquid, and the resin
  • the content is 2 to 15% by weight
  • the content of the monomer is 3 to 10% by weight
  • the content of the photoinitiator is 0.1 to 0.6% by weight
  • the content of the additive is 0.1 to 2% by weight
  • the content of the solvent is 70 to 90% by weight;
  • the content of the monomer is 3 to 10% by weight, and the content of the photoinitiator is 0.1 to 0.6% by weight.
  • the content of the additive is 0.1 to 2% by weight, and the content of the solvent is 70 to 90% by weight.
  • the invention has the beneficial effects that the quantum dot color filter provided by the invention has a simple manufacturing process and is easy to implement, and can reduce the process of a blue quantum dot pixel pattern compared with the currently used RGB process.
  • the liquid crystal display device provided by the invention uses a backlight module that generates blue fluorescence as a light source, and the quantum dot color filter reduces the process of a blue quantum dot pixel pattern compared with the currently used RGB process, and color-filters the quantum dots.
  • the sheet is disposed outside the polarizer to avoid the light utilization rate being lowered due to the change of the polarization state of the quantum dot, thereby making the liquid crystal display device have a wider color gamut and higher brightness while saving energy consumption.
  • FIG. 1 is a schematic flow chart of a method for fabricating a quantum dot color filter of the present invention
  • FIG. 2 is a schematic view showing steps 1-2 of the method for fabricating a quantum dot color filter of the present invention
  • FIG. 3 is a schematic structural view of a liquid crystal display device of the present invention.
  • the present invention provides a method for fabricating a quantum dot color filter, including:
  • Step 1 The quantum dot 100 having a core-shell structure is synthesized by the Bewendi method, and quantum dots having different particle sizes, including red light quantum dots 200 and green light quantum dots 300, can be obtained by changing the synthesis conditions during the preparation process.
  • the preparation process of the quantum dot 100 in the step 1 includes:
  • Step 11 Prepare a CdS core 101 of the quantum dot 100.
  • Step 12 preparing a ZnS shell 102 coated on the outside of the CdS core 101.
  • the particle diameter of the CdS core 101 is 2 to 5 nm
  • the particle diameter of the quantum dot 100 is 3 to 8 nm
  • the particle diameter of the red quantum dot 200 is 5 to 7 nm
  • the green quantum dot 300 is The particle size is 3 to 5 nm.
  • red light quantum dots quantum dots emitting red light
  • green quantum dots quantum dots emitting green light
  • the blue fluorescent backlight module acts as a light source, while the blue light is provided by the backlight module itself. Therefore, quantum dot color filters can only produce red quantum dot pixel patterns and green light quantities.
  • the sub-pixel pattern can reduce the process of a blue quantum dot pixel pattern compared to the currently used RGB process.
  • Step 2 The red light quantum dots and the green light quantum dots are treated by a dispersing agent to be surface-distributed to stabilize the dispersion, and the stabilized red light quantum dots 200 and the green light quantum dots 300 are obtained.
  • the dispersing agent in the step 2 is a small molecule coupling agent or an amphiphilic polymer coupling agent.
  • Step 3 Dispersing and stabilizing the stabilized red and green light quantum dots with a resin, a monomer, a photoinitiator, and an additive in a solvent to form a photosensitive dispersion containing red and green light quantum dots.
  • the photoinitiator is acetophenone, biimidazole, benzoin (benzoin) or benzophenone;
  • acetophenones are ⁇ , ⁇ -diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenyl-1-propanone (HMPP) or 2-methyl-2-morpholino 1-(4-methylphenylthio)propan-1-one;
  • the benzoin is benzophenone, benzophenone or benzoin ether.
  • the additive is at least one of a leveling agent, an antifoaming agent, and a heat stabilizer.
  • the red light quantum dot-containing photosensitive dispersion liquid is based on the total weight of the photosensitive dispersion liquid, the stabilized red light quantum dot content is 5 to 20 wt%, and the resin content is 2 to 15 wt%.
  • the content of the monomer is from 3 to 10% by weight, the content of the photoinitiator is from 0.1 to 0.6% by weight, the content of the additive is from 0.1 to 2% by weight, and the content of the solvent is from 70 to 90% by weight.
  • the content of the monomer is from 3 to 10% by weight
  • the content of the photoinitiator is from 0.1 to 0.6% by weight
  • the content of the additive is from 0.1 to 2% by weight
  • the content of the solvent is from 70 to 90% by weight.
  • the resin in the step 3 is a polyacrylate polymer, the monomer is a polyhydroxy acrylate monomer, and the solvent is a mixed solvent of one or more of propylene glycol monomethyl ether acetate.
  • Step 4 Form a pixel pattern by using the photosensitive dispersion containing red light and green light quantum dots.
  • the step 4 can form a pixel pattern by spraying or patterning.
  • the patterning includes a coating, exposure, development, and the like process.
  • the present invention further provides a liquid crystal display device including a liquid crystal panel 1 and a backlight module 2 disposed under the liquid crystal panel 1.
  • the liquid crystal panel 1 includes a first substrate 11 and a second oppositely disposed. a substrate 12, a liquid crystal layer 13 disposed between the first substrate 11 and the second substrate 12, an upper polarizing plate 111 disposed on a side of the first substrate 11 away from the liquid crystal layer 13, and a second substrate The lower polarizing plate 121 on the substrate 12 away from the liquid crystal layer 13 and the quantum dot color filter 14 disposed between the backlight module 2 and the lower polarizing plate 121.
  • the color filter using the content sub-point can make the liquid crystal display device have a wider color gamut.
  • the quantum dot has high luminous efficiency (the quantum luminous efficiency can reach 88% or more), the brightness of the liquid crystal display device can be better, that is, energy consumption can be saved.
  • the quantum dot color filter is designed outside the upper and lower polarizers, so that the problem that the light utilization rate becomes low due to the change of the polarization state of the quantum dots can be avoided.
  • a quantum dot color filter is placed between the backlight module and the lower polarizer.
  • the backlight module 2 is a blue fluorescent light source, and a side of the quantum dot color filter 14 adjacent to the lower polarizing plate 121 is provided with a red light quantum dot pixel pattern 141 and a green light quantum dot pixel pattern 142. Since blue light has higher energy, it can excite red light quantum dots (quantum dots emitting red light) and green quantum dots (quantum dots emitting green light) to generate red and green light, respectively, so that a backlight mode that produces blue fluorescence can be used.
  • the group acts as a light source and the blue light is provided by the backlight module itself. Therefore, the quantum dot color filter can only produce a red light quantum dot pixel pattern and a green light quantum dot pixel pattern, which can reduce the process of a blue quantum dot pixel pattern compared with the currently used RGB process.
  • the method for fabricating the quantum dot color filter provided by the present invention has a simple process and is easy to implement, and can reduce the process of a blue quantum dot pixel pattern compared with the currently used RGB process.
  • the liquid crystal display device provided by the invention uses a backlight module that generates blue fluorescence as a light source, and the quantum dot color filter reduces the process of a blue quantum dot pixel pattern compared with the currently used RGB process, and color-filters the quantum dots.
  • the sheet is disposed outside the polarizer to avoid the light utilization rate being lowered due to the change of the polarization state of the quantum dot, thereby making the liquid crystal display device have a wider color gamut and higher brightness while saving energy consumption.

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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)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Filters (AREA)
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Abstract

一种量子点彩色滤光片的制作方法及液晶显示装置，该量子点彩色滤光片的制作方法包括：步骤1、利用Bewendi法合成具有核壳结构的量子点(100)，在制备过程中通过改变合成条件得到具有不同粒径大小的量子点，其中包括红光量子点(200)和绿光量子点(300)；步骤2、将所述红光量子点和绿光量子点分别通过分散剂的作用对其表面进行处理，使其稳定分散，得到稳定化的红光量子点(200)与绿光量子点(300)；步骤3、将所述稳定化的红光与绿光量子点分别与树脂、单体、光引发剂、及添加剂分散并溶解在溶剂中，形成含红光与绿光量子点的光敏分散液；步骤4、利用所述含红光与绿光量子点的光敏分散液形成像素图案。

Description

量子点彩色滤光片的制作方法及液晶显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种量子点彩色滤光片的制作方法及液晶显示装置。
背景技术
目前液晶显示器(LCD，Liquid Crystal Display)的色彩是依靠彩色滤光层(CF，color filter)来实现。CF层是由彩色光阻材料经过一系列黄光制程后形成的。常用的CF光阻材料是将树脂(polymer)，单体(monomer)，光引发剂(photo initator)和颜料(pigment)溶解和分散在溶剂(solvent)后形成的。
其中的颜料(pigment)是使CF实现彩色的物质。从背光(Backlight)发出的光，经过RGB CF层时，只有对应R、G、B波段的光透过，其他波段的光被颜料(pigment)吸收，所以光经过CF层后产生RGB颜色。目前常用的RGB颜料(pigment)有R254，R177，G58，B166。一方面，这些有机颜料的透射峰相对较宽，色浓度受限，使得液晶显示器很难实现更广的色域；另一方面，由于经过CF的光大部分被吸收(约66％的损失)，只有很小部分光透过，因此对光的利用率极低(通常整体光利用率低于5％)。量子点(QDs，Quantum-Dots)是一些极其微小的半导体纳米晶体，由锌、镉、硒和硫原子组合而成，晶体中的颗粒直径不足10nm。与颜料(pigment)不同，量子点在受到电或光刺激时就会发光，并且发光波长极窄，颜色纯粹，发出的光线颜色由量子点的组成材料和直径大小，形状所决定。尺寸越小越偏向蓝光、越大越偏向红光，如果控制精确，就可以发出鲜艳的R，G，B光。因此，若将量子点应用在彩色光阻材料中，可以大大提高显示屏的亮度和画面的鲜艳度，还可以减少能耗。
现有量子点彩色滤光片均是置于液晶盒(cell)内。由于量子点和目前常用彩色滤光片中颜料(pigment)产生色彩的原理不同，量子点发光是受光激发后，量子点能带结构的变化，发出特定波长的光。液晶显示器中的背光经过下偏光片后，产生的是特定方向的线偏振光，当线偏振光激发量子点后，原本特定方向的偏振光的偏振状态会发生变化(消偏和偏振方向改变)，因此，导致光路和亮度的不可控制性。
发明内容
本发明的目的在于提供一种量子点彩色滤光片的制作方法，该制作方法制程简单，容易实现。
本发明的另一目的在于提供一种液晶显示装置，将量子点彩色滤光片设于上、下偏光片之外，避免由于量子点对偏振状态的改变导致光利用率变低，从而使液晶显示装置具有更宽的色域和更高的亮度，同时节省能耗。
为实现上述目的，本发明提供一种量子点彩色滤光片的制作方法，包括如下步骤：
步骤1、利用Bewendi法合成具有核壳结构的量子点，在制备过程中通过改变合成条件得到具有不同粒径大小的量子点，其中包括红光量子点和绿光量子点，所述红光量子点的粒径为5～7nm，所述绿光量子点的粒径为3～5nm；
步骤2、将所述红光量子点和绿光量子点分别通过分散剂的作用对其表面进行处理，使其稳定分散，得到稳定化的红光量子点与绿光量子点；
步骤3、将所述稳定化的红光与绿光量子点分别与树脂、单体、光引发剂、及添加剂分散并溶解在溶剂中，形成含红光与绿光量子点的光敏分散液；
步骤4、利用所述含红光与绿光量子点的光敏分散液形成像素图案。
所述步骤1中，所述量子点的粒径范围为3～8nm，所述红光量子点的粒径为5～7nm，所述绿光量子点的粒径为3～5nm。
所述步骤1中量子点的制备过程包括：
步骤11、制备所述量子点的CdS核；
步骤12、制备包覆于所述CdS核外部的ZnS壳。
所述步骤3中，所述含红光量子点的光敏分散液中，以光敏分散液的总重量为基准，所述稳定化的红光量子点的含量为5～20wt％，所述树脂的含量为2～15wt％、所述单体的含量为3～10wt％，所述光引发剂的含量为0.1～0.6wt％，所述添加剂的含量为0.1～2wt％，所述溶剂的含量为70～90wt％；
所述含绿光量子点的光敏分散液中，以光敏分散液的总重量为基准，所述稳定化的绿光量子点的含量为5～20wt％，所述树脂的含量为2～15wt％、所述单体的含量为3～10wt％，所述光引发剂的含量为0.1～0.6wt％，所述添加剂的含量为0.1～2wt％，所述溶剂的含量为70～90wt％。
所述步骤2中的分散剂为小分子偶联剂或两亲性的高分子偶联剂。
所述步骤3中的树脂为聚丙烯酸酯类聚合物，所述单体为多羟基丙烯 酸酯类单体，所述溶剂为丙二醇单甲醚酸酯等一种或多种的混合溶剂；所述光引发剂为苯乙酮类、双咪唑类、苯偶姻类或二苯甲酮；所述添加剂为流平剂、消泡剂和热稳定剂中的至少一种。
所述步骤4通过喷涂或图案化的方式形成像素图案。
本发明还提供一种液晶显示装置，包括液晶面板和设于所述液晶面板下方的背光模组，所述液晶面板包括相对设置的第一基板与第二基板、设于所述第一基板与第二基板之间的液晶层、设于所述第一基板上远离液晶层一侧的上偏光板、设于所述第二基板上远离液晶层一侧的下偏光板、及设于所述背光模组与下偏光板之间的量子点彩色滤光片。
所述背光模组为蓝色荧光光源，所述量子点彩色滤光片上靠近下偏光板的一侧设有红光量子点像素图案和绿光量子点像素图案。
本发明还提供一种量子点彩色滤光片的制作方法，包括如下步骤：
步骤1、利用Bewendi法合成具有核壳结构的量子点，在制备过程中通过改变合成条件得到具有不同粒径大小的量子点，其中包括红光量子点和绿光量子点；
步骤2、将所述红光量子点和绿光量子点分别通过分散剂的作用对其表面进行处理，使其稳定分散，得到稳定化的红光量子点与绿光量子点；
步骤3、将所述稳定化的红光与绿光量子点分别与树脂、单体、光引发剂、及添加剂分散并溶解在溶剂中，形成含红光与绿光量子点的光敏分散液；
步骤4、利用所述含红光与绿光量子点的光敏分散液形成像素图案；
其中，所述步骤1中，所述量子点的粒径范围为3～8nm，所述红光量子点的粒径为5～7nm，所述绿光量子点的粒径为3～5nm；
其中，所述步骤1中量子点的制备过程包括：
步骤11、制备所述量子点的CdS核；
步骤12、制备包覆于所述CdS核外部的ZnS壳；
其中，所述步骤3中，所述含红光量子点的光敏分散液中，以光敏分散液的总重量为基准，所述稳定化的红光量子点的含量为5～20wt％，所述树脂的含量为2～15wt％、所述单体的含量为3～10wt％，所述光引发剂的含量为0.1～0.6wt％，所述添加剂的含量为0.1～2wt％，所述溶剂的含量为70～90wt％；
所述含绿光量子点的光敏分散液中，以光敏分散液的总重量为基准，所述稳定化的绿光量子点的含量为5～20wt％，所述树脂的含量为2～15wt％、所述单体的含量为3～10wt％，所述光引发剂的含量为0.1～0.6wt％，所述添 加剂的含量为0.1～2wt％，所述溶剂的含量为70～90wt％。
本发明的有益效果：本发明提供的量子点彩色滤光片的制作方法，制程简单，容易实现，并且较目前常用的RGB制程可减少一道蓝光量子点像素图案的制程。本发明提供的液晶显示装置，使用产生蓝色荧光的背光模组作为光源，其量子点彩色滤光片较目前常用的RGB制程减少一道蓝光量子点像素图案的制程，并将量子点彩色滤光片设于偏光片之外，避免由于量子点对偏振状态的改变导致光利用率变低，从而使液晶显示装置具有更宽的色域和更高的亮度，同时节省能耗。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为本发明量子点彩色滤光片的制作方法的流程示意图；
图2为本发明量子点彩色滤光片的制作方法步骤1-2的示意图；
图3为本发明液晶显示装置的结构示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1，本发明提供一种量子点彩色滤光片的制作方法，包括：
步骤1、利用Bewendi法合成具有核壳结构的量子点100，在制备过程中通过改变合成条件可以得到具有不同粒径大小的量子点，其中包括红光量子点200和绿光量子点300。
具体地，请参阅图2，所述步骤1中量子点100的制备过程包括：
步骤11、制备所述量子点100的CdS核101。
步骤12、制备包覆于所述CdS核101外部的ZnS壳102。
其中，所述CdS核101的粒径为2～5nm，所述量子点100的粒径范围为3～8nm；所述红光量子点200的粒径为5～7nm，所述绿光量子点300的粒径为3～5nm。
值得一提的是，由于蓝光具有较高的能量，可以激发红光量子点(发红色光的量子点)和绿光量子点(发绿色光的量子点)分别产生红、绿光，因此可以使用产生蓝色荧光的背光模组作为光源，而蓝光由背光模组本身提供。因此，量子点彩色滤光片可以只制作红光量子点像素图案和绿光量 子点像素图案，较目前常用的RGB制程可减少一道蓝光量子点像素图案的制程。
步骤2、将所述红光量子点和绿光量子点分别通过分散剂的作用对其表面进行处理，使其稳定分散，得到稳定化的红光量子点200与绿光量子点300。
所述步骤2中的分散剂为小分子偶联剂或两亲性的高分子偶联剂。
步骤3、将所述稳定化的红光与绿光量子点分别与树脂、单体、光引发剂、及添加剂分散并溶解在溶剂中，形成含红光与绿光量子点的光敏分散液。
具体的，所述光引发剂为苯乙酮类、双咪唑类、苯偶姻(安息香)类或二苯甲酮等；
所述苯乙酮类为α，α-二乙氧基苯乙酮、2-羟基-2-甲基-1-苯基-1-丙酮(HMPP)或2-甲基-2-吗啉代-1-(4-甲基苯硫基)丙烷-1-酮等；
所述苯偶姻(安息香)类为偶苯酰、二苯乙酮醇或苯偶姻醚等。
所述添加剂为流平剂、消泡剂和热稳定剂中的至少一种。
所述含红光量子点的光敏分散液中，以光敏分散液的总重量为基准，所述稳定化的红光量子点的含量为5～20wt％，所述树脂的含量为2～15wt％、所述单体的含量为3～10wt％，所述光引发剂的含量为0.1～0.6wt％，所述添加剂的含量为0.1～2wt％，所述溶剂的含量为70～90wt％。
所述含绿光量子点的光敏分散液中，以光敏分散液的总重量为基准，所述稳定化的绿光量子点的含量为5～20wt％，所述树脂的含量为2～15wt％、所述单体的含量为3～10wt％，所述光引发剂的含量为0.1～0.6wt％，所述添加剂的含量为0.1～2wt％，所述溶剂的含量为70～90wt％。
所述步骤3中的树脂为聚丙烯酸酯类聚合物，所述单体为多羟基丙烯酸酯类单体，所述溶剂为丙二醇单甲醚酸酯等一种或多种的混合溶剂。
步骤4、利用所述含红光与绿光量子点的光敏分散液形成像素图案。
所述步骤4可以通过喷涂或图案化的方式形成像素图案。具体地，所述图案化包括涂布、曝光、显影等制程。
请参阅图3，本发明还提供一种液晶显示装置，包括液晶面板1和设于所述液晶面板1下方的背光模组2，所述液晶面板1包括相对设置的第一基板11与第二基板12、设于所述第一基板11与第二基板12之间的液晶层13、设于所述第一基板11上远离液晶层13一侧的上偏光板111、设于所述第二基板12上远离液晶层13一侧的下偏光板121、及设于所述背光模组2与下偏光板121之间的量子点彩色滤光片14。
由于量子点发出的光具有波长窄(半波峰小)，色彩鲜艳(色浓度高)的特点，因此使用含量子点的彩色滤光片可以使液晶显示装置具有更宽的色域。同时，由于量子点的发光效率高(量子发光效率可达88％以上)，可以使液晶显示装置的亮度更佳，即可以节省能耗。并且在该结构中，将量子点彩色滤光片设计在上、下偏光片之外，这样可以避免由于量子点对偏振状态的改变导致光利用率变低的问题。在该优选实施例中，量子点彩色滤光片置于背光模组和下偏光片之间。
所述背光模组2为蓝色荧光光源，所述量子点彩色滤光片14上靠近下偏光板121的一侧设有红光量子点像素图案141和绿光量子点像素图案142。由于蓝光具有较高的能量，可以激发红光量子点(发红色光的量子点)和绿光量子点(发绿色光的量子点)分别产生红、绿光，因此可以使用产生蓝色荧光的背光模组作为光源，而蓝光由背光模组本身提供。因此，量子点彩色滤光片可以只制作红光量子点像素图案和绿光量子点像素图案，较目前常用的RGB制程可减少一道蓝光量子点像素图案的制程。
综上所述，本发明提供的量子点彩色滤光片的制作方法，制程简单，容易实现，并且较目前常用的RGB制程可减少一道蓝光量子点像素图案的制程。本发明提供的液晶显示装置，使用产生蓝色荧光的背光模组作为光源，其量子点彩色滤光片较目前常用的RGB制程减少一道蓝光量子点像素图案的制程，并将量子点彩色滤光片设于偏光片之外，避免由于量子点对偏振状态的改变导致光利用率变低，从而使液晶显示装置具有更宽的色域和更高的亮度，同时节省能耗。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (13)

  1. 一种量子点彩色滤光片的制作方法，包括如下步骤：
    步骤1、利用Bewendi法合成具有核壳结构的量子点，在制备过程中通过改变合成条件得到具有不同粒径大小的量子点，其中包括红光量子点和绿光量子点；
    步骤2、将所述红光量子点和绿光量子点分别通过分散剂的作用对其表面进行处理，使其稳定分散，得到稳定化的红光量子点与绿光量子点；
    步骤3、将所述稳定化的红光与绿光量子点分别与树脂、单体、光引发剂、及添加剂分散并溶解在溶剂中，形成含红光与绿光量子点的光敏分散液；
    步骤4、利用所述含红光与绿光量子点的光敏分散液形成像素图案。
  2. 如权利要求1所述的量子点彩色滤光片的制作方法，其中，所述步骤1中，所述量子点的粒径范围为3～8nm，所述红光量子点的粒径为5～7nm，所述绿光量子点的粒径为3～5nm。
  3. 如权利要求1所述的量子点彩色滤光片的制作方法，其中，所述步骤1中量子点的制备过程包括：
    步骤11、制备所述量子点的CdS核；
    步骤12、制备包覆于所述CdS核外部的ZnS壳。
  4. 如权利要求1所述的量子点彩色滤光片的制作方法，其中，所述步骤3中，所述含红光量子点的光敏分散液中，以光敏分散液的总重量为基准，所述稳定化的红光量子点的含量为5～20wt％，所述树脂的含量为2～15wt％、所述单体的含量为3～10wt％，所述光引发剂的含量为0.1～0.6wt％，所述添加剂的含量为0.1～2wt％，所述溶剂的含量为70～90wt％；
    所述含绿光量子点的光敏分散液中，以光敏分散液的总重量为基准，所述稳定化的绿光量子点的含量为5～20wt％，所述树脂的含量为2～15wt％、所述单体的含量为3～10wt％，所述光引发剂的含量为0.1～0.6wt％，所述添加剂的含量为0.1～2wt％，所述溶剂的含量为70～90wt％。
  5. 如权利要求1所述的量子点彩色滤光片的制作方法，其中，所述步骤2中的分散剂为小分子偶联剂或两亲性的高分子偶联剂。
  6. 如权利要求1所述的量子点彩色滤光片的制作方法，其中，所述步骤3中的树脂为聚丙烯酸酯类聚合物，所述单体为多羟基丙烯酸酯类单体，所述溶剂为丙二醇单甲醚酸酯等一种或多种的混合溶剂；所述光引发剂为 苯乙酮类、双咪唑类、苯偶姻类或二苯甲酮；所述添加剂为流平剂、消泡剂和热稳定剂中的至少一种。
  7. 如权利要求1所述的量子点彩色滤光片的制作方法，其中，所述步骤4通过喷涂或图案化的方式形成像素图案。
  8. 一种液晶显示装置，包括液晶面板和设于所述液晶面板下方的背光模组，所述液晶面板包括相对设置的第一基板与第二基板、设于所述第一基板与第二基板之间的液晶层、设于所述第一基板上远离液晶层一侧的上偏光板、设于所述第二基板上远离液晶层一侧的下偏光板、及设于所述背光模组与下偏光板之间的量子点彩色滤光片。
  9. 如权利要求8所述的液晶显示装置，其中，所述背光模组为蓝色荧光光源，所述量子点彩色滤光片上靠近下偏光板的一侧设有红光量子点像素图案和绿光量子点像素图案。
  10. 一种量子点彩色滤光片的制作方法，包括如下步骤：
    步骤1、利用Bewendi法合成具有核壳结构的量子点，在制备过程中通过改变合成条件得到具有不同粒径大小的量子点，其中包括红光量子点和绿光量子点；
    步骤2、将所述红光量子点和绿光量子点分别通过分散剂的作用对其表面进行处理，使其稳定分散，得到稳定化的红光量子点与绿光量子点；
    步骤3、将所述稳定化的红光与绿光量子点分别与树脂、单体、光引发剂、及添加剂分散并溶解在溶剂中，形成含红光与绿光量子点的光敏分散液；
    步骤4、利用所述含红光与绿光量子点的光敏分散液形成像素图案；
    其中，所述步骤1中，所述量子点的粒径范围为3～8nm，所述红光量子点的粒径为5～7nm，所述绿光量子点的粒径为3～5nm；
    其中，所述步骤1中量子点的制备过程包括：
    步骤11、制备所述量子点的CdS核；
    步骤12、制备包覆于所述CdS核外部的ZnS壳；
    其中，所述步骤3中，所述含红光量子点的光敏分散液中，以光敏分散液的总重量为基准，所述稳定化的红光量子点的含量为5～20wt％，所述树脂的含量为2～15wt％、所述单体的含量为3～10wt％，所述光引发剂的含量为0.1～0.6wt％，所述添加剂的含量为0.1～2wt％，所述溶剂的含量为70～90wt％；
    所述含绿光量子点的光敏分散液中，以光敏分散液的总重量为基准，所述稳定化的绿光量子点的含量为5～20wt％，所述树脂的含量为2～15wt％、 所述单体的含量为3～10wt％，所述光引发剂的含量为0.1～0.6wt％，所述添加剂的含量为0.1～2wt％，所述溶剂的含量为70～90wt％。
  11. 如权利要求10所述的量子点彩色滤光片的制作方法，其中，所述步骤2中的分散剂为小分子偶联剂或两亲性的高分子偶联剂。
  12. 如权利要求10所述的量子点彩色滤光片的制作方法，其中，所述步骤3中的树脂为聚丙烯酸酯类聚合物，所述单体为多羟基丙烯酸酯类单体，所述溶剂为丙二醇单甲醚酸酯等一种或多种的混合溶剂；所述光引发剂为苯乙酮类、双咪唑类、苯偶姻类或二苯甲酮；所述添加剂为流平剂、消泡剂和热稳定剂中的至少一种。
  13. 如权利要求10所述的量子点彩色滤光片的制作方法，其中，所述步骤4通过喷涂或图案化的方式形成像素图案。
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