CN111638573B - Quantum dot polaroid and display device - Google Patents
Quantum dot polaroid and display device Download PDFInfo
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- CN111638573B CN111638573B CN201910154532.3A CN201910154532A CN111638573B CN 111638573 B CN111638573 B CN 111638573B CN 201910154532 A CN201910154532 A CN 201910154532A CN 111638573 B CN111638573 B CN 111638573B
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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
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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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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Abstract
The invention discloses a quantum dot polaroid and display equipment, wherein the quantum dot polaroid comprises: a polarizer; the quantum dot film with the quantum dot layer comprises quantum dots and a high polymer material, wherein the quantum dots are dispersed in the high polymer material, and the polarizer bears the quantum dot film. The quantum dot polaroid combines the quantum dot film with the polaroid, and when the quantum dot polaroid is applied to display equipment, light generated by the quantum dot layer does not need to pass through an optical layer in the backlight module, so that the loss of the light in the part is reduced. Therefore, the problem that light emitted by quantum dots needs to be seriously lost when the quantum dot film layer is arranged on the backlight module is solved, so that the loss of the light can be reduced, and the purpose of improving the light utilization in the display equipment is achieved. The display device includes the quantum dot polarizer.
Description
Technical Field
The application relates to a quantum dot polaroid and display equipment.
Background
Quantum dots have been widely used in the fields of display, illumination, etc. because of their excellent optical properties. The existing quantum dot display equipment is provided with a quantum dot film layer in a backlight module, so that the optical performance of the display equipment is improved.
However, when the quantum dot film layer is disposed on the backlight module, the light emitted from the quantum dots needs to pass through more optical layers, so that the light loss of the quantum dots is serious when the quantum dot film layer is applied to the display field.
Disclosure of Invention
To solve the above technical problem, the present application provides a quantum dot polarizer, which can reduce the loss of light emitted from quantum dots when applied to the display field.
One aspect discloses a quantum dot polarizer, comprising: a polarizer; the quantum dot film with the quantum dot layer comprises quantum dots and a high polymer material, wherein the quantum dots are dispersed in the high polymer material, and the polarizer bears the quantum dot film.
The quantum dot polaroid combines the quantum dot film with the polaroid, and when the quantum dot polaroid is applied to display equipment, light generated by the quantum dot layer does not need to pass through an optical layer in the backlight module, so that the loss of the light in the part is reduced. Therefore, the problem that light emitted by quantum dots needs to be seriously lost when the quantum dot film layer is arranged on the backlight module is solved, so that the loss of the light can be reduced, and the purpose of improving the light utilization in the display equipment is achieved.
In one embodiment, in the quantum dot layer, the polymer material includes a crystalline region in which polymer chains are regularly arranged and an amorphous region in which polymer chains are randomly arranged, and the quantum dots are dispersed in the crystalline region.
According to different arrangement rules of the polymer chains, the polymer material in the crystal region can form corresponding forms, such as single crystals, spherulites, dendrites, fiber crystals, clusters, columnar crystals, extended chain crystals, and the like. That is, in the crystal region, the quantum dots are dispersed among the polymer chains forming the form of single crystals, spherulites, dendrites, fibers, strings, columns, or extended chain crystals.
The quantum dots are dispersed among the regularly arranged polymer chains, and the regularly arranged polymer chains have a protection effect on the quantum dots dispersed among the regularly arranged polymer chains, so that the adverse effects of external water, oxygen and the like on the quantum dots are reduced. Therefore, the quantum dots in the quantum dot film are not easily damaged by water, oxygen and the like, so that the quantum dot film has good stability in the environment including water, oxygen and the like. Therefore, the stability of the quantum dot polarizer can be improved.
In one embodiment, the polymer backbone is selected from the group consisting of polyolefin-based polymers, polyester-based polymers, polyamide-based polymers, polyimide-based polymers, and combinations thereof.
Specifically, the polymer may be polyethylene, polyvinylidene fluoride, polyvinyl butyral, polyvinyl alcohol, polystyrene, polypropylene, polymethyl acrylate, polymethyl methacrylate, polydecylene formamide, polyhexamethylene sebacamide, polyethylene terephthalate glycol-modified polyethylene terephthalate, polyethylene naphthalate, polycarbonate, cellulose acetate butyrate, carnauba wax, polymethylphenyl silicone, polydimethylsiloxane, or the like.
In one embodiment, the crystallinity of the polymer material is 25% to 40%; preferably, the crystallinity of the polymer material is 30% to 35%.
The inventor finds that the crystallinity of the high molecular material plays a crucial role in the toughness of the quantum dot film; and the crystallinity is a parameter of the regular arrangement degree of the polymer chains, and plays an important role in preventing the quantum dots from being adversely affected by water, oxygen and the like. When the crystallinity of the high polymer material is in the range, the toughness of the quantum dot film adapts to the softness of the polaroid, so that the quantum dot film and the polaroid are more similar in mechanical property, and the combination is more suitable. And when the crystallinity of the polymer material is in the range, the protection of the quantum dots by the polymer chains in the polymer material is in a better balanced state, so that the stability of the quantum dot polarizer is in a better level.
In one embodiment, the quantum dot layer further comprises a hydrocarbon additive selected from at least one of saturated paraffins, saturated naphthenes; preferably, the number of carbon atoms of the saturated alkane or saturated cycloalkane is from 10 to 30; preferably, the number of carbon atoms in the saturated alkane or saturated cycloalkane is from 16 to 24.
The hydrocarbon additive can ensure that the quantum dots and the polymer are well compatible, so that the quantum dots can be uniformly dispersed among high molecular chains. In other words, the hydrocarbon additive in the composite material can increase the dispersion quantity of the quantum dots and reduce the agglomeration among the quantum dots, so that the quantum dots are stably dispersed among the high molecular chains, and the stability of the quantum dot film is improved.
Saturated paraffins and saturated naphthenes having a carbon number within the above-mentioned range have suitable boiling points and melting points. These hydrocarbon additives have a stable physical state in the quantum dot film. Therefore, under the action of the hydrocarbon additives, the quantum dots can be stably dispersed among the polymer chains, so that the quantum dot film has good stability.
More preferably, the hydrocarbon additive may be a mixture of saturated paraffins and saturated naphthenes which have good stability, such as white oil. White oils are a mixture of refined liquid hydrocarbons obtained from petroleum, mainly a mixture of saturated naphthenic and paraffinic hydrocarbons, and are obtained by atmospheric and vacuum fractionation, solvent extraction and dewaxing, hydrorefining of crude oils.
In one embodiment, the hydrocarbon additive is present in the quantum dot layer at a mass fraction of 0.1% to 10%.
The inventor finds that when the mass fraction of the hydrocarbon additive is in the above range, the quantum dots have excellent dispersibility in the high polymer material, which is beneficial to the light-emitting uniformity of the quantum dot film, and further improves the light utilization rate of the quantum dot polarizer.
In one embodiment, the quantum dot film comprises a plurality of layered structures, wherein at least one layer is a quantum dot layer; preferably, the quantum dot film comprises an odd number of layers of the layered structure.
In one embodiment, the quantum dot film includes a first quantum dot layer and a second quantum dot layer, wherein the quantum dots in the first quantum dot layer and the second quantum dot layer emit light of different wavelengths.
The quantum dots emitting different wavelengths are respectively arranged in the layered structures of different layers, so that self-absorption among different quantum dots can be reduced, and the utilization rate of light can be improved.
A display apparatus, comprising: a backlight module to emit a backlight; a liquid crystal cell; the quantum dot polaroid is arranged between the backlight module and the liquid crystal box; the quantum dot polarizer comprises a polarizer and a quantum dot film with a quantum dot layer, and the quantum dot film is borne by the polarizer; the quantum dot layer comprises quantum dots and a high polymer material, and the quantum dots are dispersed in the high polymer material.
In one embodiment, the backlight module comprises a blue light emitting element, red fluorescent powder is arranged on a light emitting surface of the light emitting element, and a quantum dot film comprises green quantum dots; preferably, the red phosphor is K 2 SiF 6 :Mn 4+ And (4) fluorescent powder.
Drawings
FIG. 1 is a schematic structural diagram of a quantum dot polarizer in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a display device in an embodiment of the present application.
In the drawings like parts are provided with the same reference numerals. The figures only show embodiments of the application schematically.
Detailed Description
The technical solutions in the examples of the present application will be described in detail below with reference to the embodiments of the present application. It should be noted that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
Quantum dot polarizer
Example 1-1:
referring to fig. 1, the quantum dot polarizer disclosed in this embodiment includes a polarizer 11 and a quantum dot film 13, where the polarizer 11 carries the quantum dot film 13.
The quantum dot film 13 includes a first layer 131, a quantum dot layer 132, and a third layer 133, which are stacked. Both the first layer 131 and the third layer 133 comprise polypropylene. The quantum dot layer 132 includes polypropylene, green emitting CdZnSe/ZnS quantum dots, red emitting InP/ZnS quantum dots, and white oil. The crystallinity of polypropylene in the quantum dot layer 132 is 32%, the crystal morphology of polypropylene is mainly a crystal structure, and CdZnSe/ZnSe quantum dots and InP/ZnS quantum dots are dispersed between the polymer chains of the crystal structure of polypropylene. The mass fractions of polypropylene, cdZnSe/ZnSe quantum dots, inP/ZnS quantum dots, and white oil in the quantum dot layer 132 were 92.5wt%, 2.5wt%, 1.0wt%, and 4.0wt%, respectively.
Examples 1 to 2:
the quantum dot polarizer disclosed in this embodiment includes a polarizer and a quantum dot film, and the quantum dot film is supported by the polarizer.
The quantum dot film includes a first layer, a quantum dot layer, and a third layer that are laminated. Both the first and third layers comprise polyethylene. The quantum dot layer comprises polyethylene, cdZnSe/ZnS quantum dots emitting green light and white oil. The crystallinity of the polyethylene in the quantum dot layer is 26%, the crystal forms of the polyethylene are mainly spherulite and serial crystal, and the CdZnSe/ZnSe quantum dots are dispersed among the spherulite and serial crystal high molecular chains of the polyethylene. The mass fractions of polyethylene, cdZnSe/ZnSe quantum dots and white oil in the quantum dot layer were 96.0wt%, 3.0wt% and 1.0wt%, respectively.
Examples 1 to 3:
the quantum dot polarizer disclosed in this embodiment includes a polarizer and a quantum dot film, and the quantum dot film is supported by the polarizer.
The quantum dot film includes only one quantum dot layer including polyethylene terephthalate, cdZnSe/ZnS quantum dots emitting green light, inP/ZnS quantum dots emitting red light, and white oil. The crystallinity of the polyethylene terephthalate is 35 percent, the crystal morphology of the polyethylene terephthalate is mainly spherical crystal and serial crystal, and the CdZnSe/ZnSe quantum dots and the InP/ZnS quantum dots are dispersed between the spherical crystal and the serial crystal of the polyethylene terephthalate. The mass fractions of polyethylene terephthalate, cdZnSe/ZnSe quantum dots, inP/ZnS quantum dots, and white oil in the quantum dot layer 132 were 88.0wt%, 3.0wt%, 1.0wt%, and 8.0wt%, respectively.
Display device
Example 2-1:
referring to fig. 2, the display apparatus disclosed in this embodiment includes a backlight module 21, a quantum dot polarizer 23 liquid crystal cell 25, and an upper polarizer 27. The quantum dot polarizer 23 and the upper polarizer 27 are respectively disposed at both sides of the liquid crystal cell 25, and the quantum dot polarizer 23 is located between the backlight module 21 and the liquid crystal cell 25.
The backlight module 21 is used for emitting blue backlight towards the quantum dot polarizer 23. The quantum dot polarizer 23 includes a polarizer 231 and a quantum dot film 233, and the quantum dot film 233 is located at a side close to the backlight module 21. The quantum dot polarizer 23 may be the quantum dot polarizer in embodiment 1-1. The red and green quantum dots in the quantum dot polarized light emit red light and green light after being excited by blue light.
The red, green and blue light finally exits from the display device through a liquid crystal box, an upper polarizer and the like, and corresponding images are displayed.
Example 2-2:
the display device disclosed by the embodiment comprises a backlight module, a quantum dot polarizer liquid crystal box and an upper polarizer. The quantum dot polaroid and the upper polaroid are respectively arranged on two sides of the liquid crystal box, and the quantum dot polaroid is positioned between the backlight module and the liquid crystal box.
The backlight module comprises a blue light LED for generating an excitation light source, and the light emitting surface of the blue light LED is coated with K 2 SiF 6 :Mn 4+ And the fluorescent powder is excited by the blue LED to emit red light. The blue light and the red light are transmitted towards the quantum dot polaroid after passing through the backlight module.
The quantum dot polarizer in embodiment 1-2 may be used as the quantum dot polarizer, in which the quantum dots are excited by blue light to emit green light.
The red, green and blue light finally emits light from the display device through a liquid crystal box, an upper polarizer and the like, and corresponding images are displayed.
Although the present disclosure has been described and illustrated in greater detail by the inventors, it should be understood that modifications and/or alterations to the above-described embodiments, or equivalent substitutions, will be apparent to those skilled in the art without departing from the spirit of the disclosure, and that no limitations to the present disclosure are intended or should be inferred therefrom.
Claims (10)
1. A quantum dot polarizer, comprising:
a polarizer;
the quantum dot film comprises a quantum dot layer and a high molecular material, wherein the quantum dots are dispersed in the high molecular material, the polarizer bears the quantum dot film, the high molecular material comprises a crystal region and an amorphous region in the quantum dot layer, polymer chains are regularly arranged in the crystal region, the polymer chains are randomly arranged in the amorphous region, the crystal region is dispersed with the quantum dots, the quantum dot layer further comprises a hydrocarbon additive, the hydrocarbon additive is selected from at least one of saturated paraffin and saturated cycloparaffin, the number of carbon atoms of the saturated paraffin or the saturated cycloparaffin is 16-24, and the mass fraction of the hydrocarbon additive in the quantum dot layer is 0.1-10%.
2. The quantum dot polarizer of claim 1 wherein the backbone of the polymer material is selected from the group consisting of polyolefin polymers, polyester polymers, polyesterate polymers, polyamide polymers, polyimide polymers, and combinations thereof.
3. The quantum dot polarizer of claim 1, wherein the crystallinity of the polymer material is 25% to 40%.
4. The quantum dot polarizer of claim 3, wherein the crystallinity of the polymer material is 30 to 35%.
5. A quantum dot polarizer as claimed in claim 1 wherein the quantum dot film comprises a plurality of layered structures, at least one of which is a quantum dot layer.
6. The quantum dot polarizer of claim 5, wherein the quantum dot film comprises an odd number of layered structures.
7. The quantum dot polarizer of claim 5 or 6 wherein the quantum dot film comprises a first quantum dot layer and a second quantum dot layer, wherein the quantum dots in the first quantum dot layer and the second quantum dot layer emit light of different wavelengths.
8. A display device, comprising: a backlight module to emit a backlight;
a liquid crystal cell;
the quantum dot polaroid is arranged between the backlight module and the liquid crystal box; wherein, the first and the second end of the pipe are connected with each other,
the quantum dot polaroid comprises a polaroid and a quantum dot film with a quantum dot layer, and the polaroid bears the quantum dot film;
the quantum dot layer comprises quantum dots and a high polymer material, wherein the quantum dots are dispersed in the high polymer material, in the quantum dot layer, the high polymer material comprises a crystal region and an amorphous region, in the crystal region, high polymer chains are regularly arranged, in the amorphous region, high polymer chains are randomly arranged, the crystal region is dispersed with the quantum dots, the quantum dot layer further comprises a hydrocarbon additive, the hydrocarbon additive is selected from at least one of saturated paraffin and saturated naphthenic hydrocarbon, the number of carbon atoms of the saturated paraffin or the saturated naphthenic hydrocarbon is 16-24, and the mass fraction of the hydrocarbon additive in the quantum dot layer is 0.1-10%.
9. The display device as recited in claim 8, wherein the backlight module comprises a blue light emitting element, a red phosphor is disposed on a light emitting surface of the blue light emitting element,
the quantum dot film includes green quantum dots.
10. The display device according to claim 9, wherein the red phosphor is K 2 SiF 6 :Mn 4+ And (4) fluorescent powder.
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| CN201910154532.3A CN111638573B (en) | 2019-03-01 | 2019-03-01 | Quantum dot polaroid and display device |
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| CN201910154532.3A CN111638573B (en) | 2019-03-01 | 2019-03-01 | Quantum dot polaroid and display device |
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| CN111638573B true CN111638573B (en) | 2022-12-02 |
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| CN106380818A (en) * | 2016-09-05 | 2017-02-08 | 青岛海信电器股份有限公司 | Quantum dot material and preparation method, quantum dot membrane, backlight module and display equipment |
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| US20180105739A1 (en) * | 2016-10-19 | 2018-04-19 | Samsung Electronics Co., Ltd. | Quantum dot-polymer composite film, method of manufacturing the same, and device including the same |
| CN107966855A (en) * | 2017-11-24 | 2018-04-27 | 宁波东旭成新材料科技有限公司 | A kind of green quantum dot film and its backlight module |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106905624B (en) * | 2017-03-20 | 2021-06-04 | 厦门玻尔科技有限公司 | Quantum dot film with high water oxygen barrier capacity and preparation method thereof |
| CN107350483B (en) * | 2017-07-14 | 2019-06-07 | 河南大学 | A kind of graded alloy quantum dot and preparation method thereof |
| CN108893119B (en) * | 2018-07-18 | 2021-06-25 | 纳晶科技股份有限公司 | Preparation method of InP-based alloy quantum dot, device and composition |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106380818A (en) * | 2016-09-05 | 2017-02-08 | 青岛海信电器股份有限公司 | Quantum dot material and preparation method, quantum dot membrane, backlight module and display equipment |
| US20180105739A1 (en) * | 2016-10-19 | 2018-04-19 | Samsung Electronics Co., Ltd. | Quantum dot-polymer composite film, method of manufacturing the same, and device including the same |
| CN107807471A (en) * | 2017-11-13 | 2018-03-16 | 深圳市华星光电技术有限公司 | Quantum dot polaroid and liquid crystal display |
| CN107966855A (en) * | 2017-11-24 | 2018-04-27 | 宁波东旭成新材料科技有限公司 | A kind of green quantum dot film and its backlight module |
| CN108929597A (en) * | 2018-07-13 | 2018-12-04 | 苏州星烁纳米科技有限公司 | Quantum dot conductive ink and quantum dot film |
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