CN108828831B - Quantum dot polaroid, display device and manufacturing method of quantum dot polaroid - Google Patents
Quantum dot polaroid, display device and manufacturing method of quantum dot polaroid Download PDFInfo
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- 239000002096 quantum dot Substances 0.000 title claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 230000010287 polarization Effects 0.000 claims abstract description 141
- 239000002073 nanorod Substances 0.000 claims abstract description 135
- 238000006243 chemical reaction Methods 0.000 claims abstract description 63
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 24
- 229920000106 Liquid crystal polymer Polymers 0.000 claims description 20
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 claims description 19
- 125000000217 alkyl group Chemical group 0.000 claims description 12
- 235000010290 biphenyl Nutrition 0.000 claims description 12
- 239000004305 biphenyl Substances 0.000 claims description 12
- 125000002843 carboxylic acid group Chemical group 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
- 239000003446 ligand Substances 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 7
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 229
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- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 229920002799 BoPET Polymers 0.000 description 1
- 229910000673 Indium arsenide Inorganic materials 0.000 description 1
- 229910018219 SeTe Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- UHYPYGJEEGLRJD-UHFFFAOYSA-N cadmium(2+);selenium(2-) Chemical compound [Se-2].[Cd+2] UHYPYGJEEGLRJD-UHFFFAOYSA-N 0.000 description 1
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- RPQDHPTXJYYUPQ-UHFFFAOYSA-N indium arsenide Chemical compound [In]#[As] RPQDHPTXJYYUPQ-UHFFFAOYSA-N 0.000 description 1
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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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
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- Crystallography & Structural Chemistry (AREA)
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- Polarising Elements (AREA)
Abstract
The invention provides a quantum dot polarizer, which comprises a red light layer, a polarization conversion layer and a green light layer which are arranged in a stacked mode, wherein the red light layer faces one side of a backlight module, the red light layer is provided with a plurality of first nanorods of which the arrangement direction is a first direction, the green light layer is provided with a plurality of second nanorods of which the arrangement direction is a second direction, the first direction is vertical to the second direction, the backlight module is used for emitting unpolarized blue light, the first nanorods are used for being excited by partial blue light to emit red light of which the polarization direction is the first direction, the polarization conversion layer is used for converting the red light of which the polarization direction is the first direction into red light of which the polarization direction is the second direction, and the second nanorods are used for being excited by partial blue light to emit green light. Through the arrangement, the blue backlight is converted into the white light, the feeding or concentration of the second nanorods of the green light layer is reduced, the utilization rate of the green light layer is improved, and the lighting effect is improved. The invention also provides a display device and a manufacturing method of the quantum dot polaroid.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to a quantum dot polaroid, a display device and a manufacturing method of the quantum dot polaroid.
Background
The quantum dot is one of the most attractive luminescent materials in the last decade, has the advantages of concentrated luminescent spectrum, high color purity, adjustable luminescent wavelength height and the like, and can greatly improve the color gamut and the color reduction capability of an LCD liquid crystal display when being applied to a TFT-LCD.
Because the red light quantum dots can be excited by blue light to emit light in the existing optical structure, the green light can also excite the red light quantum dots to emit light, and the red light of the red light quantum dots is more than that of the green light, so that in the existing structure of the quantum dot polaroid, in order to obtain uniform white light, the feeding amount or the concentration of the green light quantum dots needs to be improved to obtain the green light matched with the red light, the utilization rate of the green light quantum dots is reduced, and the light efficiency is reduced.
Disclosure of Invention
The invention aims to provide a quantum dot polarizer, which improves the fluorescence efficiency of green nanorods, thereby reducing the feeding or concentration of green quantum dots and improving the light efficiency.
In order to realize the purpose of the invention, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a quantum dot polarizer, which is configured to be installed between a backlight module and a display panel, and includes a red light layer, a polarization conversion layer, and a green light layer, which are stacked, where the red light layer faces one side of the backlight module, the red light layer is provided with a plurality of first nanorods, an arrangement direction of which is a first direction, the green light layer is provided with a plurality of second nanorods, an arrangement direction of which is a second direction, the first direction is perpendicular to the second direction, the backlight module is configured to emit unpolarized blue light, the first nanorods are configured to be excited by a portion of the blue light to emit red light, a polarization direction of which is the first direction, the polarization conversion layer is configured to convert the red light, a polarization direction of which is the first direction, into red light, a polarization direction of which is the second direction, and transmit a portion of the blue light, the second nanorods are configured to be excited by a portion of the blue light to emit green, and mixing part of the blue light and the red light and the green light in the second direction to form white light to be provided to the display panel.
The green light excited by the second nanorods comprises a part of green light facing the polarization conversion layer, the polarization conversion layer is made of a wavelength selective material, the polarization direction of the polarization conversion layer for converting the red light is rotated by 90 degrees, and the polarization directions for converting the blue light and the green light are rotated by 0 degrees.
The red light layer comprises an alignment film and a mixed resin layer which are stacked, the first nanorod is arranged in the mixed resin layer, the first nanorod and the alignment film have intermolecular acting force, the alignment film is used for arranging molecules in the same direction under the action of polarized light, and the first nanorod is driven to be arranged in the first direction through the intermolecular acting force.
The liquid crystal polymer is further arranged in the mixed resin layer, a surface ligand of the first nanorod comprises an alkyl chain and a phosphate group, the liquid crystal polymer comprises biphenyl and a carboxylic acid group, the alkyl chain is connected with the biphenyl through intermolecular force, the phosphate group is coordinated with the first nanorod, and the carboxylic acid group is connected with the alignment film through intermolecular force.
The quantum dot polarizer further comprises a reflecting layer, the reflecting layer is stacked on the red light layer back to one side of the polarization conversion layer and used for transmitting unpolarized blue light and reflecting the red light in the first direction from the orientation excited by the first nanorods, and the polarization direction of the reflecting layer is the green light in the second direction from the orientation excited by the second nanorods.
The quantum dot polarizer further comprises a polarizing layer, the polarizing layer is stacked on one side, back to the polarization conversion layer, of the green light layer, and the polarizing layer passes light with the polarization direction in the second direction and blocks light with the polarization direction in other directions.
In a second aspect, an embodiment of the present invention provides a display device, including a display panel, a backlight module, and the quantum dot polarizer according to any one of claims 1 to 6, wherein the quantum dot polarizer is disposed between the backlight module and the display panel.
In a third aspect, an embodiment of the present invention further provides a method for manufacturing a quantum dot polarizer, including the following steps:
manufacturing a red light layer on the reflecting layer, and arranging a plurality of first nanorods on the red light layer along a first direction, wherein the first nanorods are used for being excited by blue light to emit red light with the polarization direction of the first direction;
manufacturing a polarization conversion layer on the base film, wherein the polarization conversion layer is used for converting the red light with the polarization direction being the first direction into the red light with the polarization direction being the second direction;
manufacturing a green light layer on the polarization conversion layer, and arranging a plurality of second nanorods on the green light layer along a second direction, wherein the first direction is perpendicular to the second direction, and the second nanorods are used for being excited by blue light to emit green light with the polarization direction being the second direction;
and tearing off the base film, and attaching the polarization conversion layer to the red light layer.
Wherein the step of arranging the plurality of first nanorods on the red light layer in the first direction includes:
the red light layer comprises a substrate, an alignment film is coated on the substrate, a mixed resin layer of a first nanorod and a liquid crystal polymer is coated on the alignment film, a surface ligand of the first nanorod comprises an alkyl chain and a phosphate group, the liquid crystal polymer comprises biphenyl and a carboxylic acid group, the alkyl chain is connected with the biphenyl through intermolecular force, the phosphate group is coordinated with the first nanorod, and the carboxylic acid group is connected with the alignment film through molecular member force;
irradiating the red light layer with polarized light, so that the molecules of the alignment film are arranged along the same direction, and the liquid crystal polymer is arranged along the same direction by the action of the molecules of the alignment film, so that the first nanorods are arranged along the first direction under the action of the liquid crystal polymer and the surface ligand.
Wherein, when the green light layer is manufactured, the polarized light irradiating the green light layer is adjusted to deflect 90 degrees or the green light layer is adjusted to deflect 90 degrees.
The invention has the beneficial effects that:
according to the quantum dot polarizer, the red light layer and the green light layer are excited by the blue light through the arrangement of the red light layer, the polarization conversion layer and the green light layer, so that the first nanorod of the red light layer generates the red light with the polarization direction in the first direction, the polarization conversion layer converts the red light in the first direction into the red light in the second direction, and the second nanorod of the green light layer generates the green light with the polarization direction in the second direction.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a display device according to an embodiment;
FIG. 2 is a schematic structural diagram of a quantum dot polarizer according to an embodiment;
FIG. 3 is a schematic diagram of the structure of a red light layer of an embodiment;
FIG. 4 is a schematic diagram of the structure of a green layer of an embodiment;
FIG. 5 is a schematic diagram of the emission of a quantum dot polarizer according to an embodiment;
FIG. 6 is a schematic diagram of the structure of a red light layer of an embodiment;
FIG. 7a is a schematic structural diagram of a method for manufacturing a quantum dot polarizer according to an embodiment;
fig. 7b is a schematic structural diagram of a manufacturing method of a quantum dot polarizer according to an embodiment.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
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.
Referring to fig. 1, an embodiment of the present invention provides a display device, including a display panel 1, a backlight module 3, and a quantum dot polarizer 2 provided in an embodiment of the present invention, where the quantum dot polarizer 2 is disposed between the backlight module 3 and the display panel 1.
The display panel 1 is a liquid crystal display panel, and is provided with backlight through the backlight module 3, so as to display pictures.
The backlight module 3 emits blue light, for example, the light source of the backlight module 3 is made of blue light LEDs, and compared with the backlight module emitting white light, the light source does not need to integrate green light LEDs and red light LEDs, so that the structural complexity of the backlight module is reduced, and the cost is saved.
Referring to fig. 1, an embodiment of the present invention provides a quantum dot polarizer 2, where the quantum dot polarizer 2 is configured to be installed between a backlight module 3 and a display panel 1, referring to fig. 2 to 5, arrows in fig. 5 use different filling textures to represent lights with different colors, the quantum dot polarizer 2 includes a red light layer 20, a polarization conversion layer 30, and a green light layer 40, which are stacked, the red light layer 20 faces a side of the backlight module 3, the red light layer 3 is provided with a plurality of first nanorods 21, which are arranged in a first direction, the green light layer 4 is provided with a plurality of second nanorods 41, which are arranged in a second direction, the first direction and the second direction are perpendicular, referring to fig. 5, the backlight module 3 is configured to emit unpolarized blue light 100, the first nanorods 21 are configured to be excited by a portion of the blue light 100 to emit red light 200, which is polarized in the first direction, the polarization conversion layer 30 is configured to convert the red light 200 with the polarization direction of the first direction into the red light 200 with the polarization direction of the second direction, and transmit a portion of the blue light 100, the second nanorods 41 are configured to be excited by a portion of the blue light 100 to emit the green light 300 with the polarization direction of the second direction, and a portion of the blue light 100 and the red light 200 and the green light 300 in the second direction are mixed to form white light, which is provided to the display panel 1.
The principle of the embodiment of the invention is as follows: the light with short wavelength is used for exciting the quantum dot fluorescent nanorods to emit polarized light with long wavelength, the light with long wavelength cannot excite the quantum dot fluorescent nanorods to emit light with short wavelength, the wavelength relation of red light, green light and blue light is that the red light > the green light > the blue light, and the red light, the green light and the blue light are mixed to obtain white light, therefore, the blue light with the shortest wavelength is used as an excitation light source to firstly excite the first nanorods 21 to emit red light, the red light has longer wavelength than the green light and cannot excite the second nanorods 41 to emit green light, so that the red light cannot be absorbed by a green light layer, the blue light has shorter wavelength than the green light and can excite the second nanorods 41 to emit light, and therefore, the light emitted from the surface of the green light layer 40 is the red light generated by excitation, the green light generated by excitation, and the blue light of the backlight left after being absorbed by the first.
The polarization conversion layer 30 converts the red light with the polarization direction of the first direction into the red light with the polarization direction of the second direction, so that the red light transmitted through the green light layer 40 and the green light excited by the green light layer 40 have the same polarization direction, and can be mixed with the unpolarized part of the blue light to obtain white light.
A part of the blue light emitted by the backlight module 3 is absorbed by the red light layer 20, after the red light layer 20 is excited to emit red light, the remaining part of the blue light passes through the red light layer 20 and the polarization conversion layer 30, and the other part of the blue light is absorbed by the green light layer 40, after the green light layer 40 is excited to emit green light, the remaining part of the blue light passes through the green light layer 40, so that the blue light is used for respectively exciting the red light and the green light, and then the red light and the green light are mixed with the remaining blue light.
Therefore, by arranging the red light layer 20, the polarization conversion layer 30 and the green light layer 40, the red light layer 20 and the green light layer 40 are excited by blue light, so that the first nanorods 21 of the red light layer 20 generate red light with the polarization direction in the first direction, the polarization conversion layer 30 converts the red light in the first direction into red light in the second direction, and the second nanorods 41 of the green light layer 40 generate green light with the polarization direction in the second direction, therefore, the quantum dot polarizer 2 of the invention uses the blue light to excite the red light layer 20 to generate the red light, then uses the blue light to excite the green light layer 40 to generate the green light, the red light does not excite the green light, the blue backlight can be converted into white light, the projection or concentration of the second nanorods 41 of the green light layer 40 is reduced, the utilization rate of the green light layer 40 is improved.
The further principle implemented by the embodiment of the invention is as follows: the efficiency of obtaining light with a long wavelength by exciting nanorods perpendicular to the alignment direction and the polarization direction of polarized light by polarized light with a short wavelength is extremely low. Using this phenomenon, the polarization conversion layer 30 is disposed to be made of a wavelength selective material, the polarization conversion layer 30 rotates the polarization direction of the converted red light by 90 °, and the polarization directions of the converted blue and green lights by 0 °.
The green light excited by the second nanorods 41 on the green layer 40 and having the polarization direction of the second direction can be emitted to the upper and lower sides of the green layer 40, the green light excited by the second nanorods 41 includes a portion of green light toward the polarization conversion layer 30, since the polarization conversion layer 30 does not convert the polarization direction of the green light, the polarization direction of the green light is not changed after the green light is transmitted from the polarization conversion layer 30, so that the polarization direction of the green light incident into the red layer 20 is the second direction, and the arrangement direction of the first nanorods 21 on the red layer 20 is the first direction, since the first direction and the second direction are perpendicular, the excitation efficiency of the green light having the polarization direction of the second direction to the first nanorods 21 on the red layer 20 is very low, and the first nanorods 21 are not excited to generate red light, so that the red light excited by the first nanorods 21 on the nanorod layer 20 is converted into the second direction by providing the wavelength-selective polarization conversion layer 30, can be mixed with the green light, and in addition, the red light layer 20 does not excite more red light due to absorbing the green light of the green light layer 40, resulting in increased charge of the second nanorods 41 on the green light layer 40.
Compared to the case where the arrangement directions of the first nanorods 21 on the red layer 20 and the second nanorods 41 on the green layer 40 are the same (taking the first direction as an example), and the polarization conversion layer 30 is not provided, the green light emitted from the green layer 40 to the red layer 20 with the first polarization direction excites the first nanorods 21 on the red layer 20 to emit the red light with the first polarization direction, because the wavelength of the green light is shorter than that of the red light, and the light with the short wavelength can excite to generate the light with the long wavelength, which results in the increase of the overall generated red light, so that the mixed light is white light, and the luminance is sufficient, the projection of the second nanorods 41 on the green layer 40 must be increased, and the projection of the second nanorods 41 is generally 10 times that of the first nanorods 21.
The quantum dot polarizer provided by the embodiment of the invention reduces the feeding amount or concentration of the second nanorods 41 of the green light layer 40, the polarization conversion film 30 deflects red light by a polarization angle of 90 degrees, and the arrangement directions of the first nanorods 21 and the second nanorods 41 are perpendicular, so that the final polarization direction of the red light is the same as the green light and is the second direction, the polarization direction of the green light emitted from the green light layer 40 to the red light layer 20 is the second direction, the polarization conversion layer 30 does not convert the polarization direction of the green light, the excitation efficiency of the green light to the red light layer 20 is extremely low, the first nanorods 21 are not excited to emit the red light, the red light is not increased, the feeding amount of the second nanorods 41 is not required to be increased to be matched with the red light to be mixed to generate the white light, and the fluorescence utilization rate of the second nanorods 41 is improved.
As for the material of the polarization conversion layer 30, any material satisfying wavelength selectivity can be used as it is, and the present invention is not limited thereto.
The first nanorod 21 and the second nanorod 41 are quantum dot materials with a core/shell structure, have good fluorescence characteristics, and are particularly suitable for being used in the display technology field. In the present invention, the material of the luminescent core of the first nanorod 21 includes CdSe, Cd2SeTe, InAs, the material of the luminescent core of the second nanorod 41 comprising ZnCdSe2，InP，Cd2One or more of SSe, the material of the inorganic protective shell of the first nanorod 21 and the second nanorod 41 comprises CdS, ZnSe, ZnCdS2ZnS, ZnO. The first nanorods 21 and the second nanorods 41 are in a bar-shaped rod structure, the arrangement along the first direction and the arrangement along the second direction in the present invention means that the extension direction of the bar-shaped rod structure is the first direction and the second direction, and the first nanorods 21 and the second nanorods 41 are preferably respectively arranged in a rectangular array, so that the light generated by the excitation of the two is uniform.
Referring to fig. 6, the red light layer 20 includes a substrate 25, an alignment film 26 and a mixed resin layer 27 stacked together, the first nanorods 21 are disposed in the mixed resin layer 27, the first nanorods 27 and the alignment film 26 have intermolecular forces, and the alignment film 26 is used for aligning molecules in the same direction under the action of polarized light, so that the first nanorods 21 are aligned in the first direction.
The arrangement method of the first nanorods 26 adopts a principle similar to the arrangement of liquid crystal molecules in a display panel, and the first nanorods 26 are arranged along the first direction by the action of the alignment film 26, the alignment film 26 may adopt the alignment film of the prior art, and the molecular structures on the alignment film 26 may be arranged along the same direction under the action of polarized light.
A liquid crystal polymer (not shown in the figure) is further disposed in the mixed resin layer 27, a surface ligand of the first nanorod 21 includes an alkyl chain and a phosphate group, the liquid crystal polymer includes biphenyl and a carboxylic acid group, the alkyl chain is connected with the biphenyl by intermolecular force, the phosphate group is coordinated with the first nanorod 21, and the carboxylic acid group is connected with the alignment film 26 by intermolecular force.
Specifically, the surface ligand molecular formula of the first nanorod 21 may be:
the liquid crystalline polymer may have the formula:
the molecular formula of the alignment film may be:
through the interaction among the surface ligand, the liquid crystal polymer, the alignment film and the first nanorods 21, the alignment film 26 is irradiated by polarized light, and the first nanorods 21 are driven to be arranged along the first direction under the molecular action of the alignment film 26.
It is understood that the structure of the green light layer 40 is similar to that of the red light layer 20, and the second nanorods 41 are aligned in the second direction with reference to the red light layer 20.
Referring to fig. 2 and 5, the quantum dot polarizer further includes a reflective layer 10, wherein the reflective layer 10 is stacked on a side of the red light layer 20 opposite to the polarization conversion layer 30, and is configured to transmit unpolarized blue light, reflect red light excited by the first nanorods 21 and having a polarization direction toward the reflective layer 10 as the first direction, and reflect green light excited by the second nanorods 41 and having a polarization direction toward the reflective layer 10 as the second direction.
As can be seen from the foregoing, the blue light 100 excites the first nanorods 21 of the red light layer 20 to emit the red light 200 with the polarization direction being the first direction, and the red light emitted by the first nanorods 21 can be emitted toward the upper and lower sides of the red light layer 20, and when the red light is emitted toward the lower side, i.e., toward the reflective layer 10, the red light is reflected by the reflective layer 10, so that the part of the red light emitted toward the reflective layer 10 can also be utilized, i.e., the red light reflected back by the reflective layer 10 is still the red light with the polarization direction being the first direction, and after passing through the red light layer 20, the polarization direction can be converted by the polarization conversion layer 30 to 90 °, so as to form the red light with the polarization direction being the first direction, and then the red light is emitted.
As can be seen from the foregoing, the second nanorods 41 of the blue light-excited green light layer 40 emit green light 300 having a polarization direction of the second direction, and the green light emitted by the second nanorods 41 can be emitted toward the upper and lower sides of the green light layer 40, and when emitted toward the lower side, i.e., toward the reflective layer 10, the polarization direction of the green light transmitted through the polarization conversion layer 30 is the second direction because the polarization conversion layer 30 does not convert the polarization direction of the green light, and the polarization direction of the green light transmitted through the polarization conversion layer 30 is the second direction because the arrangement direction of the first nanorods 41 on the red light layer 20 is the first direction and the excitation efficiency of the green light of the second direction to the first nanorods 21 is very low, the first nanorods 21 are not excited to generate red light, but are emitted through the red light layer 20 toward the reflective layer 10, the reflective layer 10 reflects the green light having a polarization direction of the second direction, and the reflected green light does not change the polarization direction, and thus, but transmits through the red light layer 20 and the polarization conversion layer 30 and is emitted from the green light layer 40 in a direction away from the polarization conversion layer 30, so that the reflective layer 10 can reflect the green light emitted toward the reflective layer 10 back to be utilized, and thus, the utilization rate of the green light is also improved.
The reflective layer 10 is also transparent to blue light, a portion of which excites the first nanorods 21 of the red light emitting layer 20 to emit red light, and a portion of which excites the second nanorods 41 of the green light emitting layer 40 to emit green light, and the remaining blue light is emitted from the side of the green light emitting layer 40 opposite to the polarization conversion layer 30, and mixed with the red light and the green light to form white light for providing to the display panel. Therefore, blue light is not reflected from the red light layer 20, the polarization conversion layer 30, or the green light layer 40 back to the reflective layer.
In view of the above, the material of the reflective layer 10 is a wavelength selective reflective film, which transmits unpolarized blue light but cannot transmit polarized red and green light, but reflects polarized red and green light without changing the polarization direction. Of course, in practical applications, the reflective layer 10 may also be a PET Film or Barrier Film, which transmits a part of polarized red light and green light, but reflects a majority of polarized red light and green light, so that the utilization rate of red light and green light can be improved compared to the direct waste of polarized red light and green light.
The quantum dot polarizer further includes a polarizing layer 50, the polarizing layer 50 is stacked on a side of the green layer 40 opposite to the polarization conversion layer 30, and the polarizing layer 50 passes light with the polarization direction of the second direction and blocks light with the polarization direction of the other directions.
As can be seen from the foregoing, the light emitted from the green light layer 40 with the polarization direction in the second direction is red light and green light, and the blue light is in the non-polarization direction, and the polarizing layer 50 is disposed, so that the red light and the green light can pass through first, and the blue light can be filtered, so that the light transmitted through the polarizing layer 50 also has the polarization direction in the second direction, and the red light, the green light, and the blue light emitted from the polarizing layer 50 are all in the polarization direction in the second direction, and the three are mixed to generate white light with the polarization direction in the second direction, which is more suitable for being provided to a display panel, thereby improving the brightness of the.
The polarizing layer 50 is not limited to be made of any material, and may be an existing polarizer.
Referring to fig. 7a and 7b, and with reference to fig. 1 to 6, an embodiment of the present invention further provides a method for manufacturing a quantum dot polarizer, including the following steps:
manufacturing a red light layer 20 on a reflective layer 10, and arranging a plurality of first nanorods 21 on the red light layer 20 along a first direction, wherein the first nanorods 21 are used for being excited by blue light to emit red light with a polarization direction of the first direction;
manufacturing a polarization conversion layer 30 on the base film 60, wherein the polarization conversion layer 30 is used for converting the red light with the polarization direction of the first direction into the red light with the polarization direction of the second direction;
manufacturing a green light layer 40 on the polarization conversion layer 30, and arranging a plurality of second nanorods 41 on the green light layer 40 along a second direction, where the first direction is perpendicular to the second direction, and the second nanorods 41 are used for being excited by blue light to emit green light with a polarization direction of the second direction;
the base film 60 is peeled off, and the polarization conversion layer 30 is attached to the red light layer 20.
Wherein the step of arranging the plurality of first nanorods 21 on the red light layer 20 in the first direction includes:
the red light layer 20 includes a substrate 25, an alignment film 26 coated on the substrate 25, a mixed resin layer 27 of a first nanorod 21 and a liquid crystal polymer coated on the alignment film 26, a surface ligand of the first nanorod 21 including an alkyl chain and a phosphate group, the liquid crystal polymer including biphenyl and a carboxylic acid group, the alkyl chain and the biphenyl being connected by an intermolecular force, the phosphate group being coordinated to the first nanorod, the carboxylic acid group and the alignment film being connected by a molecular member force;
the red light layer 20 is irradiated with polarized light so that the molecules of the alignment film 26 are aligned in the same direction, and the liquid crystal polymer is aligned in the same direction by the molecules of the alignment film so that the first nanorods 21 are aligned in the first direction by the liquid crystal polymer and the surface ligand.
Wherein the green light layer 40 has a structure similar to that of the red light layer 20, and the step of arranging the second nanorods 41 on the green light layer 40 in the second direction when fabricating the green light layer 40 is substantially the same as that of fabricating the red light layer 20 except that the polarized light illuminating the green light layer 40 is adjusted to be deflected by 90 ° or the green light layer 40 is adjusted to be deflected by 90 °. The polarized light irradiating the green light layer 40 is adjusted to deflect 90 degrees, so that an included angle between the arrangement direction of the alignment films of the green light layer 40 and the arrangement direction of the alignment films 26 of the red light layer is 90 degrees, and the alignment films of the green light layer 40 drive the arrangement direction of the second nanorods 41 to be in a second direction, wherein the second direction is perpendicular to the first direction. The deflection of the green light layer 40 is adjusted to 90 degrees, the angle of the polarized light is kept unchanged, and the effect that the included angle between the arrangement direction of the alignment films of the green light layer 40 and the arrangement direction of the alignment films 26 of the red light layer is 90 degrees can also be achieved.
In the step of attaching the polarization conversion layer 30 to the red light layer 20, the arrangement direction of the second nanorods 41 on the green light layer 40 is made to be the second direction, and is perpendicular to the arrangement direction of the first nanorods 21 on the red light layer 20 as the first direction.
Therefore, the red light layer 20 and the green light layer 40 are irradiated by polarized light firstly, so that the arrangement directions of the first nanorods 21 and the second nanorods 41 are vertical, and then the red light layer 20 and the green light layer 40 are attached, so that the structure of the quantum dot polarizer meets the requirements.
The method for manufacturing the quantum dot polarizer further includes the step of manufacturing a polarizing layer 50, providing a polarizing layer 50, and setting the direction of light passing through the polarizing layer 50 to be the second direction, so as to realize that light with the second polarization direction is transmitted and light with other directions is blocked.
The manufacturing method of the quantum dot polarizer further comprises the step of coating an adhesive layer, specifically, coating a first adhesive layer 11 on the reflecting layer 10, and then adhering the red light layer 20 to the reflecting layer 10 through the first adhesive layer 11; coating a second adhesive layer 61 on the base film 60, and adhering the polarization conversion layer 30 to the base film 60 through the second adhesive layer 61; coating a third adhesive layer 31 on the polarization conversion layer 30, and adhering the green layer 40 to the polarization conversion layer 30 through the third adhesive layer 31; tearing off the base film 60, and adhering the polarization conversion layer 30 to the red light layer 20 through the second adhesive layer 61; a fourth adhesive layer 42 is coated on the green light layer 40, and the polarizing layer 50 is adhered to the green light layer 40 through the fourth adhesive layer 42.
According to the quantum dot polarizer manufactured by the manufacturing method of the quantum dot polarizer provided by the embodiment of the invention, the red light layer 20, the polarization conversion layer 30 and the green light layer 40 are manufactured, and the red light layer 20 and the green light layer 40 are excited by blue light, so that the first nanorods 21 of the red light layer 20 generate red light with the polarization direction in the first direction, the polarization conversion layer 30 converts the red light in the first direction into red light in the second direction, the second nanorods 41 of the green light layer 40 generate green light with the polarization direction in the second direction, and the green light layer 40 cannot be excited by the red light and cannot absorb the red light to influence the red light luminous efficiency.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A quantum dot polarizer is arranged between a backlight module and a display panel, and comprises a red light layer, a polarization conversion layer and a green light layer, wherein the red light layer faces one side of the backlight module, the red light layer is provided with a plurality of first nanorods, the arrangement direction of the first nanorods is a first direction, the green light layer is provided with a plurality of second nanorods, the arrangement direction of the second nanorods is a second direction, the first direction is perpendicular to the second direction, the backlight module is used for emitting unpolarized blue light, the first nanorods are used for being excited by part of the blue light to emit red light, the polarization direction of the first nanorods is the first direction, the polarization conversion layer is used for converting the red light, the polarization direction of which is the first direction, into red light, the polarization direction of which is the second direction, and transmitting part of the blue light, the second nanorods are used for being excited by part of the blue light to emit green light, the polarization direction is the second direction, and mixing part of the blue light and the red light and the green light in the second direction to form white light to be provided to the display panel.
2. The quantum dot polarizer of claim 1, wherein the green light excited by the second nanorods includes a portion of the green light toward the polarization conversion layer, the polarization conversion layer is made of a wavelength selective material, the polarization conversion layer rotates the polarization direction of the converted red light by 90 °, and rotates the polarization directions of the converted blue and green lights by 0 °.
3. The quantum dot polarizer of claim 1 or 2, wherein the red light layer comprises an alignment film and a mixed resin layer stacked together, the first nanorods are disposed in the mixed resin layer, the first nanorods and the alignment film have intermolecular forces, and the alignment film is configured to align molecules in a same direction under polarized light, and to drive the first nanorods to be aligned in the first direction by the intermolecular forces.
4. The quantum dot polarizer of claim 3, wherein a liquid crystal polymer is further disposed in the mixed resin layer, the surface ligands of the first nanorods include alkyl chains and phosphate groups, the liquid crystal polymer includes biphenyl and carboxylic acid groups, the alkyl chains are connected with the biphenyl with intermolecular force, the phosphate groups are coordinated with the first nanorods, and the carboxylic acid groups are connected with the alignment film with intermolecular force.
5. The quantum dot polarizer of claim 2, further comprising a reflective layer laminated on a side of the red light layer facing away from the polarization conversion layer, for transmitting unpolarized blue light, and reflecting red light excited from the first nanorods toward the first direction and green light excited from the second nanorods toward the second direction.
6. The quantum dot polarizer of claim 1 or 2, further comprising a polarizing layer laminated on a side of the green light layer facing away from the polarization conversion layer, the polarizing layer passing light having the second direction of polarization and blocking light having the other direction of polarization.
7. A display device comprising a display panel, a backlight module and the quantum dot polarizer of any of claims 1 to 6, wherein the quantum dot polarizer is disposed between the backlight module and the display panel.
8. A manufacturing method of a quantum dot polaroid is characterized by comprising the following steps:
manufacturing a red light layer on the reflecting layer, and arranging a plurality of first nanorods on the red light layer along a first direction, wherein the first nanorods are used for being excited by blue light to emit red light with the polarization direction of the first direction;
manufacturing a polarization conversion layer on the base film;
manufacturing a green light layer on the polarization conversion layer, and arranging a plurality of second nanorods on the green light layer along a second direction, wherein the first direction is perpendicular to the second direction, the second nanorods are used for being excited by blue light to emit green light with the polarization direction of the second direction, and the polarization conversion layer is used for converting red light with the polarization direction of the first direction into red light with the polarization direction of the second direction;
and tearing off the base film, and attaching the polarization conversion layer to the red light layer.
9. The method of manufacturing a quantum dot polarizer of claim 8, wherein the step of arranging the plurality of first nanorods on the red light layer along the first direction comprises:
the red light layer comprises a substrate, an alignment film is coated on the substrate, a mixed resin layer of a first nanorod and a liquid crystal polymer is coated on the alignment film, a surface ligand of the first nanorod comprises an alkyl chain and a phosphate group, the liquid crystal polymer comprises biphenyl and a carboxylic acid group, the alkyl chain is connected with the biphenyl through intermolecular force, the phosphate group is coordinated with the first nanorod, and the carboxylic acid group is connected with the alignment film through intermolecular force;
irradiating the red light layer with polarized light, so that the molecules of the alignment film are arranged along the same direction, and the liquid crystal polymer is arranged along the same direction by the action of the molecules of the alignment film, so that the first nanorods are arranged along the first direction under the action of the liquid crystal polymer and the surface ligand.
10. The method of manufacturing a quantum dot polarizer according to claim 9, wherein the polarized light irradiated to the green light layer is adjusted to be deflected by 90 ° or the green light layer is adjusted to be deflected by 90 ° when the green light layer is manufactured.
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| CN109471300A (en) * | 2018-12-06 | 2019-03-15 | 青岛海信电器股份有限公司 | A kind of display panel and display device |
| CN110794615A (en) * | 2019-11-28 | 2020-02-14 | Tcl华星光电技术有限公司 | Backlight module and display device |
| CN111334244A (en) * | 2020-02-28 | 2020-06-26 | Tcl华星光电技术有限公司 | Packaging fluorescent glue layer, manufacturing method thereof and quantum dot backlight source |
| CN212255948U (en) * | 2020-06-30 | 2020-12-29 | 惠州视维新技术有限公司 | Quantum layer, display screen, backlight module and display |
| CN113540324B (en) * | 2021-07-13 | 2022-09-20 | 厦门大学 | Manufacturing method of RGB-LED device emitting three-primary-color polarized light |
| CN116469990B (en) * | 2023-03-31 | 2024-07-09 | 惠科股份有限公司 | Display device and display apparatus |
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