CN106646994B - Polaroid, liquid crystal display device and preparation method of polaroid - Google Patents

Polaroid, liquid crystal display device and preparation method of polaroid Download PDF

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CN106646994B
CN106646994B CN201611147360.XA CN201611147360A CN106646994B CN 106646994 B CN106646994 B CN 106646994B CN 201611147360 A CN201611147360 A CN 201611147360A CN 106646994 B CN106646994 B CN 106646994B
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quantum dot
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CN106646994A (en
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李冬泽
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TCL Huaxing Photoelectric 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
    • G02F1/133528—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
    • 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

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

Abstract

The invention discloses a polaroid which is attached to the surface of an array substrate facing a backlight module, and comprises a first protective layer, a polarizing layer and a second protective layer which are sequentially stacked, wherein the first protective layer and the second protective layer are used for preventing the polarizing layer from being hydrolyzed, the first protective layer is positioned on one side of the polarizing layer, which is far away from the array substrate, the polaroid also comprises a quantum dot functional layer, the quantum dot functional layer is positioned between the first protective layer and the polarizing layer or on one side of the first protective layer, which is far away from the polarizing layer, and the quantum dot functional layer is used for converting monochromatic backlight emitted by the backlight module into color light. The spectrum of the color light emitted by the quantum dot functional layer is wide, so that the color gamut of the displayed image of the LCD is high, the color reduction effect is good, the quantum dot functional layer is prepared in the polarizer of the display equipment, no additional device is needed, the manufacturing process is simple and easy to realize, and the material cost and the production cost are low.

Description

Polaroid, liquid crystal display device and preparation method of polaroid
Technical Field
The invention relates to the technical field of display, in particular to a polarizer, liquid crystal display equipment and a preparation method of the polarizer.
Background
Thin Film Transistor liquid crystal displays (TFT-LCDs) have been developed rapidly and widely used in recent years, and are widely used in display devices of portable mobile electronic products, such as mobile phones, digital cameras, palm computers, GPRS and other mobile products. Because the display module of LCD shows after filtering backlight, therefore the colour gamut of LCD depends on the spectrum of being shaded completely. However, the spectrum of the Light Emitting Diode (LED) is narrow, which results in a relatively low color gamut of the LCD display using the LED as a backlight, and the displayed image is prone to color distortion. To improve the display effect of LCD displays, quantum dot materials are often used to improve the color gamut of LCD displays. Quantum Dots (QDs) material has the advantages of concentrated light-emitting spectrum, high color purity and the like, and the Quantum dot material is arranged between the backlight module and the display module to greatly improve the color gamut of the LCD and improve the color reduction capability of the LCD.
In the prior art, quantum dots with red, green and blue light-emitting wave bands are mixed and packaged in an engineering plastic film (QDfilm) or a glass tube (QD tube), and the structure is arranged between a backlight and a display system, so that the traditional white backlight is used for exciting a quantum dot material to emit colored light to achieve the purpose of enriching the color gamut.
Disclosure of Invention
The invention aims to solve the technical problems of poor color reduction effect, high production and material cost, high preparation difficulty and material dependence of a quantum dot plastic film and a quantum dot glass tube in the prior art.
In order to solve the technical problem, the invention provides a polarizer attached to the surface of an array substrate facing a backlight module, wherein the polarizer comprises a first protective layer, a polarizing layer and a second protective layer which are sequentially stacked, the first protective layer and the second protective layer are used for preventing the polarizing layer from being hydrolyzed, the first protective layer is positioned on one side of the polarizing layer, which is far away from the array substrate, the polarizer further comprises a quantum dot functional layer, the quantum dot functional layer is positioned between the first protective layer and the polarizing layer or on one side of the first protective layer, which is far away from the polarizing layer, and the quantum dot functional layer is used for converting monochromatic backlight emitted by the backlight module into color light.
Further, the quantum dot functional layer comprises a plurality of polyelectrolyte layers and a plurality of quantum dot layers, the polyelectrolyte layers and the quantum dot layers have charges with different electrical properties, the polyelectrolyte layers and the quantum dot layers are arranged on the side, facing the polarizing layer, of the first protection layer or on the side, facing away from the polarizing layer, of the first protection layer in a stacking mode, the polyelectrolyte layers and the quantum dot layers are arranged in an alternating mode, one quantum dot layer is adsorbed on each of two opposite sides of each polyelectrolyte layer, and one polyelectrolyte layer is adsorbed on each of two opposite sides of each quantum dot layer.
Further, the backlight module is a backlight source emitting blue backlight, the quantum dot layer comprises at least one red particle layer and at least one green particle layer, the red particle layer is used for converting the blue backlight part into red light, the green particle layer is used for converting the blue backlight part into green light, one red particle layer and one polyelectrolyte layer are mutually adsorbed to form a first particle layer, one green particle layer and one polyelectrolyte layer are mutually adsorbed to form a second particle layer, the first particle layer and the second particle layer are alternately arranged, one second particle layer is arranged between every two adjacent first particle layers, and one first particle layer is arranged between every two adjacent second particle layers.
Further, the red particle layer comprises a plurality of red quantum dot particles, and the red quantum dot particles comprise an inorganic protective shell and a red luminescent core wrapped in the inorganic protective shell; the green particle layer comprises a plurality of green quantum dot particles, the green quantum dot particles comprise the inorganic protective shell and a green luminescent core wrapped in the inorganic protective shell, and the inorganic protective shell is used for protecting the red luminescent core and the green luminescent core.
Further, the inorganic protective shell is CdS, ZnSe or ZnCdS2ZnS and ZnO materials.
The invention also provides liquid crystal display equipment which comprises a backlight module, a display module and the polarizer, wherein the display module comprises an array substrate, the polarizer is attached to one side of the array substrate, which faces the backlight module, and the backlight module emits monochromatic backlight which is converted into color light through the polarizer and penetrates through the display module to display color images.
The invention also provides a preparation method of the polaroid, which comprises the following steps:
coating cellulose triacetate on the surface of the base material to form a second protective layer;
coating polyvinyl alcohol on the surface of one side, away from the base material, of the second protective layer to form a polarizing layer;
preparing a quantum dot functional layer on the surface of one side of the polarizing layer, which is far away from the second protective layer, and coating cellulose triacetate on the surface of one side of the quantum dot functional layer, which is far away from the polarizing layer, to form a first protective layer,
or coating cellulose triacetate on the surface of one side of the polarizing layer, which is far away from the second protective layer, to form a first protective layer, and preparing a quantum dot functional layer on the surface of one side of the first protective layer, which is far away from the polarizing layer.
Further, the method for preparing the quantum dot functional layer comprises the following steps:
coating positively charged polydiallyldimethylammonium chloride on the surface of the side, away from the second protective layer, of the polarizing layer or the surface of the side, away from the polarizing layer, of the first protective layer to form a polyelectrolyte layer;
coating red quantum dot particles with negative charges on the surface of the polyelectrolyte layer to form a red particle layer;
coating the poly diallyl dimethyl ammonium chloride with positive charges on the surface of the red particle layer to form the polyelectrolyte layer again;
and coating the green quantum dot particles with negative charges on the surface of the polyelectrolyte layer to form a green particle layer, and repeating the process.
Further, the polydiallyldimethylammonium chloride, the red quantum dot particles and the green quantum dot particles are coated and then dried by an air knife.
Further, the concentration of the poly (diallyldimethylammonium chloride) was 2 mg/mL.
The invention has the following beneficial effects: the single-color light emitted by the backlight module excites the quantum dot functional layer arranged in the polaroid to emit color light, the color light serving as a backlight source penetrates through the display module to display images, the spectrum of the color light emitted by the quantum dot functional layer is wide, the color gamut of the displayed images of the LCD is high, the color reduction effect is good, meanwhile, the quantum dot functional layer is prepared in the polaroid which is provided by the display device, no additional device is required to be added, the manufacturing process is simple and easy to realize, and the material cost and the production cost are low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other obvious modifications can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a polarizer according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a quantum dot functional layer of a polarizer according to an embodiment of the present invention.
Fig. 3 is a flowchart of a method for manufacturing a polarizer according to an embodiment of the present invention.
Fig. 4a to 4e are schematic process diagrams of step S103 of the method for manufacturing a polarizer according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a polarizer according to a second embodiment of the present invention.
Fig. 6 is a flowchart of a method for manufacturing a polarizer according to a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a polarizer according to an embodiment of the present invention, and as shown in the drawing, the polarizer includes a first protection layer 22, a polarizing layer 10, and a second protection layer 24 that are sequentially stacked, where the first protection layer 22 and the second protection layer 24 are used to prevent the polarizing layer 10 from being hydrolyzed, the first protection layer 22 is located on a side of the polarizing layer 10 away from the array substrate 70, the polarizer further includes a quantum dot functional layer 30, the quantum dot functional layer 30 is located between the first protection layer 22 and the polarizing layer 10, and the quantum dot functional layer 30 is used to convert monochromatic backlight emitted by a backlight module into color light.
The single-color light emitted by the backlight module excites the quantum dot functional layer 30 arranged in the polaroid to emit color light, the color light is used as a backlight source and penetrates through the display module to display images, the spectrum of the color light emitted by the quantum dot functional layer 30 is wide, the color gamut of the displayed images of the LCD is high, the color reduction effect is good, meanwhile, the quantum dot functional layer 30 is prepared in the polaroid which is the display device, additional devices do not need to be added, the manufacturing process is simple and easy to realize, and the material cost and the production cost are low.
Specifically, the polarizing layer 10 is dyed polyvinyl alcohol (PVA), which is a main film layer in the polarizer having a polarizing function, but the PVA is very easy to hydrolyze, and in order to protect physical properties of the polarizing film, a layer of cellulose Triacetate (TAC) film having high light transmittance, good water resistance, and a certain mechanical strength is respectively compounded on two sides of the PVA for protection, that is, the first protective layer 22 and the second protective layer 24. Further, the polarizer further includes a substrate 40 for supporting the layers of the polarizer. Specifically, the substrate 40 includes a first surface 402 and a second surface 404 which are oppositely disposed, the first surface 402 is sequentially stacked with a second protective layer 24, a polarizing layer 10, a quantum dot functional layer 30 and a first protective layer 22, the second surface 404 is coated with a pressure sensitive adhesive layer 502(PSA film) with a certain thickness, and is compounded with an isolation film layer 504(Release film) which protects the pressure sensitive adhesive layer 502. In the manufacturing process of the LCD, the polarizer is attached to one side of the array substrate 70 facing the backlight module, specifically, the isolation film 504 of the polarizer is peeled off, and the polarizer is attached to the array substrate 70 by compressing the pressure sensitive adhesive layer 502. The polaroid has simple structure and easy preparation, and the mode of attaching the polaroid to the display module is simple and easy.
Further, the surface of the first protection layer 22 facing away from the quantum dot functional layer 30 is further compounded with a protection film 60, a reflective film, a semi-transparent and semi-reflective adhesive layer film, and the like, which can be suitable for different product types and use requirements.
Referring to fig. 2, in the present embodiment, the quantum dot functional layer 30 includes a plurality of polyelectrolyte layers 300 and a plurality of quantum dot layers 31, the polyelectrolyte layers 300 and the quantum dot layers 31 have charges with different electrical properties, each polyelectrolyte layer 300 adsorbs one quantum dot layer 31, and the polyelectrolyte layers 300 and the quantum dot layers 31 are sequentially arranged in a staggered and stacked manner. Specifically, the polyelectrolyte layer 300 is formed of a cationic polyelectrolyte having positive charges, the quantum dot layer 31 is formed of quantum dot particles having negative charges, and the polyelectrolyte layer 300 and the quantum dot layer 31 are adsorbed to each other by electrostatic adsorption force. The polyelectrolyte layers 300 and the quantum dot layers 31 are arranged in a stacked and staggered manner, further, the polyelectrolyte layers 300 and the quantum dot layers 31 are arranged on the side, facing the polarizing layer 10, of the first protection layer 22 or on the side, facing away from the polarizing layer 10, of the first protection layer 22 in a stacked manner, specifically, the polyelectrolyte layers 300 and the quantum dot layers 31 are arranged alternately, the multiple polyelectrolyte layers 300 and the quantum dot layers 31 are sequentially stacked on the surface of the first protection layer 22 according to the sequence of the polyelectrolyte layer 300, the quantum dot layers 31, the polyelectrolyte layer 300 and the quantum dot layer 31, namely, one quantum dot layer 31 is adsorbed on each of two opposite sides of each polyelectrolyte layer 300, and one polyelectrolyte layer 300 is adsorbed on each of two opposite sides of each quantum dot layer 31. In one embodiment, the odd numbered layers are polyelectrolyte layers 300 and the even numbered layers are quantum dot layers 31. Since each quantum dot layer 31 requires a polyelectrolyte layer 300 to be adsorbed and fixed, the number of layers of the polyelectrolyte layer 300 and the quantum dot layer 31 is the same, and the number of layers of the polyelectrolyte layer 300 and the quantum dot layer 31 is determined according to the actual display requirements of the LCD display. Specifically, the polyelectrolyte layer 300, which is a substance that adsorbs the quantum dot layer 31 and supports the structure of the quantum dot functional layer 30, does not have the ability to convert monochromatic light into color light, and the ability to convert light is accomplished by the quantum dot layer 31, and the number of layers of the quantum dot layer 31 determines the conversion rate of the quantum dot functional layer 30 to monochromatic backlight, that is, the more the number of layers of the quantum dot layer 31 is, the more monochromatic backlight is converted. On the other hand, when the number of quantum dot layers 31 is fixed, the luminance of the monochromatic backlight is adjusted, and since the capability of the monochromatic backlight that each quantum dot layer 31 can convert is fixed, the higher the luminance of the monochromatic backlight is, the more the part of the monochromatic backlight converted by the quantum dot layer 31 is removed, and the more the monochromatic backlight is not converted, the more the image light displayed by the LCD display device is biased toward the color of the monochromatic backlight. Meanwhile, the same quantum dot layer 31 has different conversion capability for monochromatic backlights with different wavelengths (colors), so that the monochromatic backlights with different colors and different brightness can be matched to control and adjust the color gamut by changing the number of the quantum dot layers 31.
In this embodiment, the backlight module is a backlight source emitting blue backlight, the quantum dot layer 31 includes at least one red particle layer 302 and at least one green particle layer 304, the red particle layer 302 is used to convert a part of the blue backlight into red light, the green particle layer 304 is used to convert a part of the blue backlight into green light, the red particle layer 302 and the polyelectrolyte layer 300 are adsorbed to each other to form a first particle layer, the green particle layer 304 and the polyelectrolyte layer 300 are adsorbed to each other to form a second particle layer, and the first particle layer and the second particle layer are arranged in a staggered and stacked manner. Specifically, the first particle layers and the second particle layers are sequentially arranged according to the sequence of one first particle layer, one second particle layer, one first particle layer and one second particle layer, namely, one second particle layer is arranged between every two adjacent first particle layers, and one first particle layer is arranged between every two adjacent second particle layers. Further, in the quantum dot functional layer 30, the respective film layers are circularly stacked and arranged in sequence according to the polyelectrolyte layer 300, the red particle layer 302, the polyelectrolyte layer 300, and the green particle layer 304. The red particle layer 302 and the green particle layer 304 with the same number of layers convert the blue backlight part into red light and green light with the same quantity, and the unconverted blue backlight is matched, so that the backlight source which passes through the polarizer and is output and enters the display module is colored light consisting of three primary colors of red, green and blue, the color spectrum of the backlight source is improved, and the color gamut of the LCD display equipment is increased.
In this embodiment, the red particle layer 302 includes a plurality of red quantum dot particles, and the red quantum dot particles include an inorganic protective shell and a red luminescent core wrapped in the inorganic protective shell; the green particle layer 304 includes a plurality of green quantum dot particles, the green quantum dot particles include an inorganic protective shell and a green luminescent core wrapped in the inorganic protective shell, and the inorganic protective shell is used for protecting the red luminescent core and the green luminescent core to maintain physical stability of the red luminescent core and the green luminescent core.
In this embodiment, the inorganic protective shell is CdS, ZnSe, ZnCdS2ZnS and ZnO material, and red light material including CdSe and Cd2SeTe, InAs, ZnCuInSxSey and CuInSx, and the green light material comprises ZnCdSe2、InP、Cd2Sse, ZnCuInSxSey and CuInSx.
In this embodiment, the polyelectrolyte layer 300 is formed of a poly (diallyldimethylammonium chloride) (PDDA) material, and the concentration of poly (diallyldimethylammonium chloride) used is 2 mg/mL. The poly (diallyl dimethyl ammonium chloride) has lower cost, and the material cost is not increased greatly.
The single-color light emitted by the backlight module excites the quantum dot functional layer 30 arranged in the polaroid to emit color light, the color light is used as a backlight source and penetrates through the display module to display images, the spectrum of the color light emitted by the quantum dot functional layer 30 is wide, the color gamut of the displayed images of the LCD is high, the color reduction effect is good, meanwhile, the quantum dot functional layer 30 is prepared in the polaroid which is the display device, additional devices do not need to be added, the manufacturing process is simple and easy to realize, and the material cost and the production cost are low.
Fig. 3 is a flowchart of a method for manufacturing a polarizer according to an embodiment of the present invention, where as shown in the figure, the steps of manufacturing the polarizer are as follows:
s101, coating cellulose triacetate on the surface of the base material 40 to form a second protective layer 24.
The cellulose triacetate has the characteristics of high light transmittance, good water resistance and certain mechanical strength, and is suitable for protecting materials which are easy to hydrolyze from hydrolysis.
And S102, coating polyvinyl alcohol on the surface of the second protective layer 24, which is opposite to the substrate 40, to form the polarizing layer 10.
The polyvinyl alcohol is dyed before coating, has a polarization function, is extremely easy to hydrolyze, and needs to be protected by respectively compounding a layer of cellulose triacetate film with high light transmittance, good water resistance and certain mechanical strength on two sides of the polyvinyl alcohol.
S103, preparing a quantum dot functional layer 30 on the surface of the polarizing layer 10 on the side away from the second protective layer 24.
Specifically, referring to fig. 4a to 4e, S103 includes the following sub-steps:
coating positively charged poly (diallyldimethylammonium chloride) on the surface of the polarizing layer 10 on the side away from the second protective layer 24 to form a polyelectrolyte layer 300;
coating red quantum dot particles with negative charges on the surface of the polyelectrolyte layer 300 to form a red particle layer 302;
coating the poly (diallyldimethylammonium chloride) with positive charges on the surface of the red particle layer 302 to form a polyelectrolyte layer 300 again;
the negatively charged green quantum dot particles are coated on the surface of the polyelectrolyte layer 300 to form a green particle layer 304, and the above process is repeated.
Furthermore, the number of the red particle layer 302 is the same as that of the green particle layer 304, so as to convert the blue backlight into red light and green light with the same intensity, and form color light by combining the blue backlight which is not converted and directly penetrates through the quantum dot functional layer 30, and the color light is output and enters the display module.
Specifically, the number of layers of the red particle layer 302 and the green particle layer 304 is set according to the luminance of the blue backlight, and the larger the luminance of the blue backlight is, the more the blue backlight needs to be converted to achieve uniform luminance of red, green, and blue colors, the larger the number of layers of the red particle layer 302 and the green particle layer 304 is.
In this example, the polydiallyldimethylammonium chloride, the red quantum dot particles, and the green quantum dot particles were all dried with an air knife.
In this example, the concentration of poly (diallyldimethylammonium chloride) was 2 mg/mL.
In this embodiment, the red particle layer 302 includes a plurality of red quantum dot particles, and the red quantum dot particles include an inorganic protective shell and a red luminescent core wrapped in the inorganic protective shell; the green particle layer 304 includes a plurality of green quantum dot particles, the green quantum dot particles include an inorganic protective shell and a green luminescent core wrapped in the inorganic protective shell, and the inorganic protective shell is used for protecting the red luminescent core and the green luminescent core to maintain physical stability of the red luminescent core and the green luminescent core.
Further, the inorganic protective shell is CdS, ZnSe or ZnCdS2ZnS and ZnO material, and red light material including CdSe and Cd2SeTe, InAs, ZnCuInSxSey and CuInSx, and the green light material comprises ZnCdSe2、InP、Cd2Sse, ZnCuInSxSey and CuInSx.
And S104, coating cellulose triacetate on the surface of the quantum dot functional layer 30, which is opposite to the side of the polarizing layer 10, to form the first protective layer 22.
The first protective layer 22 and the second protective layer 24 protect the quantum dot functional layer 30 and the polarizing layer 10 therein, and maintain their physical properties.
The single-color light emitted by the backlight module excites the quantum dot functional layer 30 arranged in the polaroid to emit color light, the color light is used as a backlight source and penetrates through the display module to display images, the spectrum of the color light emitted by the quantum dot functional layer 30 is wide, the color gamut of the displayed images of the LCD is high, the color reduction effect is good, meanwhile, the quantum dot functional layer 30 is prepared in the polaroid which is the display device, additional devices do not need to be added, the manufacturing process is simple and easy to realize, and the material cost and the production cost are low.
Fig. 5 is a schematic structural diagram of a polarizer according to a second embodiment of the present invention, and as shown in the drawing, a difference between this embodiment and the first embodiment is that the quantum dot functional layer 30 is located on a side of the first protective layer 22 away from the polarizing layer 10. The single-color light emitted by the backlight module excites the quantum dot functional layer 30 arranged in the polaroid to emit color light, the color light is used as a backlight source and penetrates through the display module to display images, the spectrum of the color light emitted by the quantum dot functional layer 30 is wide, the color gamut of the displayed images of the LCD is high, the color reduction effect is good, meanwhile, the quantum dot functional layer 30 is prepared in the polaroid which is the display device, additional devices do not need to be added, the manufacturing process is simple and easy to realize, and the material cost and the production cost are low.
Fig. 6 is a flowchart of a method for manufacturing a polarizer according to a second embodiment of the present invention, where as shown in the figure, the steps of manufacturing the polarizer are as follows:
s201, coating cellulose triacetate on the surface of the base material 40 to form a second protective layer 24.
The cellulose triacetate has the characteristics of high light transmittance, good water resistance and certain mechanical strength, and is suitable for protecting materials which are easy to hydrolyze from hydrolysis.
And S202, coating polyvinyl alcohol on the surface of the second protective layer 24, which is opposite to the substrate 40, to form the polarizing layer 10.
The polyvinyl alcohol is dyed before coating, has a polarization function, is extremely easy to hydrolyze, and needs to be protected by respectively compounding a layer of cellulose triacetate film with high light transmittance, good water resistance and certain mechanical strength on two sides of the polyvinyl alcohol.
And S203, coating cellulose triacetate on the surface of the side, away from the second protective layer 24, of the polarizing layer 10 to form the first protective layer 22.
The first protective layer 22 and the second protective layer 24 protect the quantum dot functional layer 30 therein, and maintain physical properties thereof.
S204, preparing the quantum dot functional layer 30 on the surface of the first protective layer 22, which is far away from the polarizing layer 10.
Specifically, S204 includes the following substeps:
coating positively charged polydiallyldimethylammonium chloride on a surface of the first protective layer 22 facing away from the polarizing layer 10 to form a polyelectrolyte layer 300;
coating red quantum dot particles with negative charges on the surface of the polyelectrolyte layer 300 to form a red particle layer 302;
coating the poly (diallyldimethylammonium chloride) with positive charges on the surface of the red particle layer 302 to form a polyelectrolyte layer 300 again;
the negatively charged green quantum dot particles are coated on the surface of the polyelectrolyte layer 300 to form a green particle layer 304, and the above process is repeated.
Furthermore, the number of the red particle layer 302 is the same as that of the green particle layer 304, so as to convert the blue backlight into red light and green light with the same intensity, and form color light by combining the blue backlight which is not converted and directly penetrates through the quantum dot functional layer 30, and the color light is output and enters the display module.
Specifically, the number of layers of the red particle layer 302 and the green particle layer 304 is set according to the luminance of the blue backlight, and the larger the luminance of the blue backlight is, the more the blue backlight needs to be converted to achieve uniform luminance of red, green, and blue colors, the larger the number of layers of the red particle layer 302 and the green particle layer 304 is.
In this example, the polydiallyldimethylammonium chloride, the red quantum dot particles, and the green quantum dot particles were all dried with an air knife.
In this example, the concentration of poly (diallyldimethylammonium chloride) was 2 mg/mL.
In this embodiment, the red particle layer 302 includes a plurality of red quantum dot particles, and the red quantum dot particles include an inorganic protective shell and a red luminescent core wrapped in the inorganic protective shell; the green particle layer 304 includes a plurality of green quantum dot particles, the green quantum dot particles include an inorganic protective shell and a green luminescent core wrapped in the inorganic protective shell, and the inorganic protective shell is used for protecting the red luminescent core and the green luminescent core to maintain physical stability of the red luminescent core and the green luminescent core.
Further, the inorganic protective shell is CdS, ZnSe or ZnCdS2ZnS and ZnO material, and red light material including CdSe and Cd2SeTe, InAs, ZnCuInSxSey and CuInSx, and the green light material comprises ZnCdSe2、InP、Cd2Sse, ZnCuInSxSey and CuInSx.
The single-color light emitted by the backlight module excites the quantum dot functional layer 30 arranged in the polaroid to emit color light, the color light is used as a backlight source and penetrates through the display module to display images, the spectrum of the color light emitted by the quantum dot functional layer 30 is wide, the color gamut of the displayed images of the LCD is high, the color reduction effect is good, meanwhile, the quantum dot functional layer 30 is prepared in the polaroid which is the display device, additional devices do not need to be added, the manufacturing process is simple and easy to realize, and the material cost and the production cost are low.
The invention also provides liquid crystal display equipment which comprises a backlight module, a display module and the polaroid, wherein the display module comprises an array substrate 70, the polaroid is attached to one side of the array substrate 70, which faces the backlight module, and the backlight module emits monochromatic backlight which is converted into color light through the polaroid and penetrates through the display module to display color images.
The single-color light emitted by the backlight module excites the quantum dot functional layer 30 arranged in the polaroid to emit color light, the color light is used as a backlight source and penetrates through the display module to display images, the spectrum of the color light emitted by the quantum dot functional layer 30 is wide, the color gamut of the displayed images of the LCD is high, the color reduction effect is good, meanwhile, the quantum dot functional layer 30 is prepared in the polaroid which is the display device, additional devices do not need to be added, the manufacturing process is simple and easy to realize, and the material cost and the production cost are low.
While the invention has been described with reference to a number of illustrative embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (8)

1. The polaroid is attached to the surface, facing a backlight module, of an array substrate and is characterized by comprising a first protective layer, a polarizing layer and a second protective layer which are sequentially stacked, wherein the first protective layer and the second protective layer are used for preventing the polarizing layer from being hydrolyzed; the quantum dot functional layer comprises a plurality of polyelectrolyte layers and a plurality of quantum dot layers, the polyelectrolyte layers and the quantum dot layers are alternately arranged, the backlight module is a backlight source emitting blue backlight, the quantum dot layer comprises at least one red particle layer and at least one green particle layer, the red particle layer is used for converting the blue backlight part into red light, the green particle layer is used for converting the blue backlight part into green light, one red particle layer and one polyelectrolyte layer are mutually adsorbed to form a first particle layer, one green particle layer and one polyelectrolyte layer are mutually adsorbed to form a second particle layer, the first particle layers and the second particle layers are alternately arranged, one second particle layer is arranged between every two adjacent first particle layers, and one first particle layer is arranged between every two adjacent second particle layers.
2. The polarizer according to claim 1, wherein said polyelectrolyte layer and said quantum dot layer have different electrical charges, said polyelectrolyte layer and said quantum dot layer are disposed in a stack on a side of said first protective layer facing said polarizing layer or a side facing away from said polarizing layer, and one said quantum dot layer is adsorbed on each of opposite sides of each said polyelectrolyte layer, and one said polyelectrolyte layer is adsorbed on each of opposite sides of each said quantum dot layer.
3. The polarizer of claim 2, wherein the red particle layer comprises a plurality of red quantum dot particles, and the red quantum dot particles comprise an inorganic protective shell and a red luminescent core wrapped in the inorganic protective shell; the green particle layer comprises a plurality of green quantum dot particles, the green quantum dot particles comprise the inorganic protective shell and a green luminescent core wrapped in the inorganic protective shell, and the inorganic protective shell is used for protecting the red luminescent core and the green luminescent core.
4. The polarizer of claim 3, wherein the inorganic protective shell is CdS, ZnSe, ZnCdS2ZnS and ZnO materials.
5. A liquid crystal display device, characterized in that, the liquid crystal display device comprises a backlight module, a display module and the polarizer of any one of claims 1 to 4, the display module comprises an array substrate, the polarizer is attached to one side of the array substrate facing the backlight module, the backlight module emits monochromatic backlight, the monochromatic backlight is converted into color light through the polarizer, and the color light passes through the display module to display color images.
6. A method for preparing a polarizer, comprising:
coating cellulose triacetate on the surface of the base material to form a second protective layer;
coating polyvinyl alcohol on the surface of one side, away from the base material, of the second protective layer to form a polarizing layer;
preparing a quantum dot functional layer on the surface of one side of the polarizing layer, which is far away from the second protective layer, and coating cellulose triacetate on the surface of one side of the quantum dot functional layer, which is far away from the polarizing layer, to form a first protective layer,
or coating cellulose triacetate on the surface of one side, which is far away from the second protective layer, of the polarizing layer to form a first protective layer, and preparing a quantum dot functional layer on the surface of one side, which is far away from the polarizing layer, of the first protective layer;
the method for preparing the quantum dot functional layer comprises the following steps:
coating positively charged polydiallyldimethylammonium chloride on the surface of the side, away from the second protective layer, of the polarizing layer or the surface of the side, away from the polarizing layer, of the first protective layer to form a polyelectrolyte layer;
coating red quantum dot particles with negative charges on the surface of the polyelectrolyte layer to form a red particle layer;
coating the poly diallyl dimethyl ammonium chloride with positive charges on the surface of the red particle layer to form the polyelectrolyte layer again;
and coating the green quantum dot particles with negative charges on the surface of the polyelectrolyte layer to form a green particle layer, and repeating the process.
7. The method for preparing a polarizer according to claim 6, wherein the polydiallyldimethylammonium chloride, the red quantum dot particles and the green quantum dot particles are dried by an air knife after being coated.
8. The method for producing a polarizer according to claim 7, wherein the concentration of the polydiallyldimethylammonium chloride is 2 mg/mL.
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