KR20170011615A - All-in-one quantumdot sheet having light diffusing function, Manufacturing method thereof and Back light unit containing the same - Google Patents

All-in-one quantumdot sheet having light diffusing function, Manufacturing method thereof and Back light unit containing the same Download PDF

Info

Publication number
KR20170011615A
KR20170011615A KR1020150104512A KR20150104512A KR20170011615A KR 20170011615 A KR20170011615 A KR 20170011615A KR 1020150104512 A KR1020150104512 A KR 1020150104512A KR 20150104512 A KR20150104512 A KR 20150104512A KR 20170011615 A KR20170011615 A KR 20170011615A
Authority
KR
South Korea
Prior art keywords
quantum dot
layer
sheet
light
fibrous web
Prior art date
Application number
KR1020150104512A
Other languages
Korean (ko)
Inventor
김주형
황준식
Original Assignee
주식회사 아모그린텍
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 아모그린텍 filed Critical 주식회사 아모그린텍
Priority to KR1020150104512A priority Critical patent/KR20170011615A/en
Publication of KR20170011615A publication Critical patent/KR20170011615A/en

Links

Images

Classifications

    • 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 
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • G02F2001/01791—

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

The nanofibrous aggregate of the present invention has a fibrous web structure layer having a three-dimensional network structure. The nanofibres aggregate comprises a web structure layer It is possible to reduce the volume and / or the thickness of the BLU by replacing the diffusion sheet and / or applying the diffusion sheet in manufacturing the BLU because the diffusion sheet function is provided by the structure and shape of the BLU. , It is possible to provide a display and a lighting apparatus capable of emitting white light through a BLU while using a small quantum dot as compared with an existing quantum dot sheet and having excellent color reproducibility.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-diffusing integrated quantum dot sheet, a method of manufacturing the same, and a backlight unit including the light-

More particularly, the present invention relates to a quantum dot sheet including a fiber-web structure layer for quantum dot display in which a light diffusion function and a white light conversion function for blue light are integrated, a method for manufacturing the same, Unit.

BACKGROUND ART Generally, a backlight unit is a light source device that emits light from behind a liquid crystal display, such as a liquid crystal display (LCD), and uses LEDs as a light source. The backlight unit uses fluorescent materials such as red (R) or green (G) for the blue (B) LED chip to emit white light when the LED is used as a light source.

Recently, a backlight unit that emits white light using a quantum dot sheet (or film 1d) has been proposed (see FIG. 1). White light realized through the quantum dot sheet 1d is transmitted through a conventional blue LED chip and a fluorescent material There is an advantage in that the color expressing power is superior to that of white light, and thus the production amount of the backlight unit using the quantum dot sheet 1d is gradually increasing.

In general, a backlight unit incorporating a quantum dot sheet includes a light guide plate 1, an LED light source 2 disposed on a side surface of the light guide plate 1, a reflection plate 3 disposed below the light guide plate 1, The diffusion sheet 5, and the prism sheet 6, which are sequentially stacked on the upper surface of the light guide plate 4,

For example, when the LED light source 1b is a blue LED, a quantum dot sheet 4 including quantum dots capable of emitting red (R) and green (G) light is used. 2, the quantum dot sheet 4 includes a quantum dot layer 4a having quantum dots distributed therein and a barrier layer 4b covering upper and lower surfaces of the quantum dot layer 4a. The barrier layer 4b blocks moisture and air from flowing into the quantum dot layer 4a. The quantum dot sheet 4 is formed by bonding a barrier layer 4b to the upper and lower surfaces of the quantum dot layer 4a So that a separate adhesive layer 4c is provided between the quantum dot layer 4a and the barrier layer 4b. The adhesive layer 4c lowers the light transmittance and the light efficiency of light, and the manufacturing process is complicated, thereby increasing the manufacturing cost.

The quantum dot layer 4a is in contact with air in the process of bonding the barrier layer 4b to the upper surface and the lower surface of the quantum dot layer 4a after forming the quantum dot layer 4a in the quantum dot sheet 4 And the quantum dot layer becomes thick, making it difficult to reduce the thickness. In addition, a conventional backlight unit incorporating a quantum dot sheet needs to additionally include a diffusion sheet for improving brightness and the like, which also makes it difficult to reduce the thickness of the backlight unit.

In addition, the conventional quantum dot sheet 4 may have entangled or clumped quantum dots in the quantum dot layer 4a, resulting in deterioration of the intrinsic characteristics of quantum dots and frequent failures in which uniform light emission is not achieved. To solve this problem, It is necessary to include quantum dots in the layer 4a in an amount larger than the quantum dots of the required reference value, which causes the manufacturing cost of the quantum dot sheet to increase.

Therefore, it is inevitable to develop a new quantum dot sheet technology that is capable of changing the white light to blue light and exhibiting excellent color reproducibility while being capable of being thinned and having a complex function.

KR 2012-0091441 A KR 2014-0139680 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a nanofibers having a three-dimensional network structure in which a fibrous web structure layer is formed, An object of the present invention is to provide a quantum dot sheet in which functions of a diffusion sheet and a quantum dot sheet capable of realizing white light and improving color reproducibility against blue light while using quantum dots are integrated.

Another object of the present invention is to provide a method for producing the quantum dot sheet with high productivity.

Further, the present invention aims to provide a BLU with reduced thickness by removing a diffusion sheet (or diffusion film) by introducing a light diffusion function integral quantum dot sheet.

It is another object of the present invention to provide a liquid crystal display (LCD), a light emitting diode (LED) display, and a light emitting diode (LED) lighting device having excellent coloring ability by incorporating the BLU.

According to an aspect of the present invention, there is provided a quantum dot device comprising: a quantum dot layer including at least one selected from a quantum dot and a fluorescent material; And a fibrous web structure layer formed of an aggregate of nanofibers.

According to a preferred embodiment of the present invention, the light diffusion function integral type quantum dot sheet has the fibrous web structure layer laminated on the upper part of the quantum dot layer in the light transmission direction, and the fibrous web structure layer and the quantum dot layer may be integrated have.

In addition, the nanofibers of the fibrous web structure layer may include quantum dots or may not include quantum dots.

In addition, the fibrous web structure layer may further include a barrier layer on the top, or the nanofibers of the fibrous web structure layer may be formed with a barrier coating layer coated with a barrier material on the nanofiber surface.

In addition, the quantum dots of the quantum dot layer and / or the quantum dots of the fibrous web structure layer may have a red quantum dot (PL) having a photoluminescence peak wavelength of 600 nm to 750 nm; Yellow-based quantum dots having a PL wavelength peak of 550 nm to 600 nm; And a green system quantum dot having a PL wavelength peak of 490 nm to 530 nm.

In addition, the phosphor may include at least one selected from a silicate-based fluorescent material, a sulfide-based fluorescent material, an oxynitride-based fluorescent material, a nitride-based fluorescent material, and an aluminate-based fluorescent material.

The quantum dot layer may include the red-based quantum dot and the green-based fluorescent material.

The nanofibers of the fibrous web structure layer may include the red-based quantum dots, the quantum dot layer may include green-based quantum dots; And the green-based phosphor; And the like.

Also, the nanofibers of the fibrous web structure layer include the green-based quantum dots, the quantum dot layer includes the red-based quantum dots; And the red-based phosphor; And the like.

The quantum dot may have an average particle diameter of 1 nm to 50 nm, and the phosphor may have an average particle diameter of 2,000 nm to 30,000 nm.

In addition, the nanofibers may have an average particle diameter of 200 nm to 2,000 nm, the average thickness of the quantum dot layer may be 30 μm to 100 μm, and the average thickness of the fibrous web structure layer may be 10 μm to 200 μm.

In addition, the polymer resin constituting the nanofibers of the quantum dot layer and the fibrous web structure layer may include the same resin.

Further, the light diffusion function integral type quantum dot sheet of the present invention can be obtained by using a color coordinate system measuring device under the condition of a distance of 0.5 m between the blue light source and the quantum dot sheet and a measurement angle of 0.2,

Figure pat00001
The CIE x value and the CIE y value can satisfy the color coordinate values of the following equations (1) and (2).

[Equation 1]

0.25? CIE x? 0.35

[Equation 2]

0.30? CIEy? 0.40

Further, the light diffusion function integral quantum dot sheet of the present invention can have a color reproduction ratio of 100% or more and a luminance of 4,000 cd / m 2 or more when viewed from the NTSC 100% color region based on the CIE 1931 color coordinate.

According to another aspect of the present invention, there is provided a method for manufacturing a light diffusing function integrated quantum dot sheet, comprising the steps of: preparing a quantum dot layer with a first mixed solution containing a quantum dot dispersion solution, a polymer resin, and a solvent; A second step of electrospinning or electrospinning a second mixed solution containing a polymer resin and a solvent on the quantum dot layer to form an aggregated layer of nanofibers; And drying the aggregated laminated nanofibers to form a fibrous web structure layer having a three-dimensional network structure.

The first mixed solution may further include a phosphor.

The second mixed solution may further include a quantum dot dispersion solution.

The three-step drying can be performed by hot air drying at 30 ° C to 60 ° C.

The method may further include a fourth step of forming a barrier layer by laminating a barrier film on the fibrous web structure layer or coating a barrier material after the third step.

Further, the present invention provides a backlight unit including various types of optical diffusion function integral quantum dot sheets as described above.

In addition, the backlight unit does not include a separate diffusion sheet (or diffusion film) as a component, and may include a light guide plate, the quantum dot sheet, and a prism sheet.

Further, the quantum dot sheet and the prism sheet may be stacked on the upper surface of the light guide plate in order.

The light guide plate may further include a reflection plate disposed on a lower end surface of the light guide plate.

Further, the present invention can provide a light emitting diode (LED) illumination device including the above-described quantum dot sheets of various types of fibrous web structures.

In addition, the present invention can provide a display such as a liquid crystal display (LCD), a light emitting diode (LED) or the like including the backlight unit.

The quantum dot sheet according to the present invention is characterized in that a fibrous aggregate, rather than a simple sheet-like film or sheet-like quantum dot sheet (or film) as shown in Figs. 2A and 2B, has a fibrous web structure layer having a three- As a sheet, there is an effect of irregularly reflecting light due to its structure and shape. Thus, it is possible to reduce the volume and / or thickness of the BLU by omitting the application of the diffusion sheet in the production of BLU and to reduce the problem of uniform dispersion and quantum point deterioration of the quantum dots And can emit white light through the BLU while using a small quantum dot compared to the conventional quantum dot sheet, thereby achieving high color reproducibility.

Furthermore, since the quantum dot sheet of the present invention has a fibrous web structure layer, it has excellent flexibility and can be applied to a flexible display and a flexible lighting apparatus.

1 is a schematic sectional view of a backlight unit incorporating a conventional quantum dot sheet,
2A and 2B are schematic cross-sectional views of a conventional quantum dot sheet,
3A to 3E are cross-sectional views schematically showing a quantum dot sheet according to an embodiment of the present invention,
4A is a SEM photograph of a part of the fibrous web structure layer produced by electrospinning,
Figure 4b shows a schematic enlargement of the nanofibers forming the three-dimensional network structure in the fibrous web structure layer,
5 is a schematic sectional view of a backlight unit incorporating the diffusion function integral type quantum dot sheet of the present invention,
6 shows the CIE 1931 color coordinate system.

The term "layer" or "sheet" used in the present invention is meant to encompass both sheet, film, or plate form unless the form otherwise referred to.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In an edge type display, a backlight unit (BLU) is generally formed by stacking a light guide plate 1, a diffusion sheet 5 and a prism sheet as shown in FIG. 1, and in recent years, a white light The quantum dot sheet 4 is introduced between the light guide plate 1 and the diffusion sheet 5 in order to improve the color reproducibility by the implementation.

However, in the conventional BLU, since an adhesive layer is introduced between the light guide plate and the quantum dot sheet due to the introduction of the quantum dot sheet and an adhesive layer is additionally provided between the quantum dot sheet and the diffusion sheet, there is a problem that it is difficult to reduce the thickness of the BLU The adhesive layer 40 for introducing the barrier layer 30 must be formed on the upper and lower surfaces of the quantum dot layer 10 in order to prevent oxidation of the quantum dots in the quantum dot sheet itself as schematically shown in Figs. 2A and 2B. There is a problem that the BLU becomes thick and thin, and the optical characteristics are deteriorated by the adhesive layer.

However, since the light diffusion functional integrated quantum dot sheet 100 of the present invention has the fibrous web structure layer 20 having a light diffusing function, since the diffusion sheet is not required separately, the adhesive layer for bonding the quantum dot sheet and the diffusion sheet And may or may not require the use of adhesives to form barrier layers.

3A, the quantum dot sheet 100 of the present invention is a structure in which a fibrous web structure layer 20 in which a nanofiber aggregate forms a three-dimensional network structure on one side of a quantum dot layer 10 is laminated.

In addition, since the fibrous web structure layer 20 and the quantum dot layer of the fibrous web structure layer 20 are fusion-bonded (or integrated) to each other, the fibrous web structure layer and the adhesive layer for bonding the quantum dot layer are not required separately. For this purpose, it is possible to increase the bonding strength between the web structure layer and the quantum dot layer by using the same polymer resin as the polymer resin used for manufacturing the fibrous web structure layer and the quantum dot layer.

 As shown in the SEM photograph of the fibrous web structure layer in FIG. 4A, the quantum dots in the nanofibers may not be applied, and the fibrous web structure layer 20 may be formed as shown in a schematic diagram in which the fibrous web structure layer is enlarged in FIG. The nanofibers constituting the nanofibers may include quantum dots.

3B and 3C, the quantum dot sheet 100 of the present invention includes quantum dots and phosphors that include two or more quantum dots having different PL wavelengths or different PL wavelengths in the quantum dot layer 10, The web structure layer 20 may not include quantum dots.

That is, when the blue light emitted from the blue light source passes through the light guide plate and passes through the quantum dot sheet of the present invention, it is converted into white light by the green system quantum dot and the red system quantum dot of the quantum dot layer 10, When the light passes through the three-dimensional network structure formed by the nanofibrous aggregates of the nanofibers, the white light diffuses irregularly and the light is diffused to improve the brightness.

The quantum dot layer 10 has a red quantum dot (PL) having a photoluminescence (PL) wavelength peak of 600 nm to 750 nm; Yellow-based quantum dots having a PL wavelength peak of 550 nm to 600 nm; And a green system quantum dot having a PL wavelength peak of 490 nm to 530 nm; And may include the red-based quantum dots 15 and the green-based quantum dots 17, as shown in FIG. 3B.

Alternatively, as shown in FIG. 3C, the quantum dot layer 10 may include the red-based quantum dots 15 and the green-based fluorescent material 13 having a PL wavelength peak of 490 nm to 530 nm, Green-based quantum dots 17 and a red-based phosphor 13 having a PL wavelength peak of 600 nm to 750 nm.

The quantum dot sheet 100 of the present invention includes quantum dots and / or phosphors having quantum dots in the nanofibers of the fibrous web structure layer 20 and having PL wavelength peaks different from those of the nanofibers in the quantum dot layer 10 So that blue light can be converted into white light while passing through the quantum dot layer 10 and the fibrous web structure layer 20. For example, as shown in FIG. 3D, the quantum dot layer 10 may include the green-based quantum dot 17 and the nanofibers of the fibrous web structure layer may include the red-based quantum dot 15. As another example, the quantum dot layer 10 may include a green-based phosphor 13 and the nanofibers of the web structure layer may include red-based quantum dots 15 as shown in FIG. 3E.

The quantum dot layer 10 may include both the green quantum dot 17 and the green phosphor 13 and the nanofibers of the fibrous web structure layer may include red quantum dots 15.

The quantum dot layer 10 may include both the red quantum dots 15 and the red phosphors 13 and the nanofibers of the fibrous web structure layer may include green quantum dots 17.

The quantum dot sheet 100 of the present invention may be coated with a barrier material on the surface of the nanofibers constituting the fibrous web structure layer to prevent oxidation of the quantum dots. A barrier layer or a barrier coating layer may be formed.

The present invention will be described in more detail with reference to the description of a method for producing such a diffusion function integral type quantum dot sheet.

The quantum dot sheet of the present invention comprises a first step of preparing a quantum dot layer with a first mixed solution containing a quantum dot dispersion solution, a polymer resin, and a solvent; A second step of electrospinning or electrospinning a second mixed solution containing a polymer resin and a solvent on the quantum dot layer to form an aggregated layer of nanofibers; And a third step of drying the aggregated laminated nanofibers to form a fibrous web structure layer having a three-dimensional network structure.

The first mixed solution of the first step may be prepared by further adding a phosphor.

The second mixed solution of the two steps may be prepared by further adding a quantum dot dispersion solution.

The quantum dot of the quantum dot dispersion solution of the first and / or second step is a particle whose core is composed of nano-sized II-IV semiconductor particles. The fluorescence of the quantum dot is converted into a valence band from the conduction band It is the light that is generated by the excited state of the electrons. In the present invention, the quantum dot may be a red quantum dot having a PL (photoluminescence) wavelength peak of 600 nm to 750 nm; Yellow-based quantum dots having a PL wavelength peak of 550 nm to 600 nm; And a green system quantum dot having a PL wavelength peak of 490 nm to 530 nm; , And preferably at least one selected from the red-based quantum dots and the green-based quantum dots.

The quantum dot may be a general quantum dot used in the related art. Specific examples of the quantum dot include a group II-VI, a group III-V, a group IV-VI, and a group IV semiconductor. AlN, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, InSb, AlN, AlP, BN, BP, BAs, , AlSb, GaN, GaP, GaAs, GaSb, ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdxSeySz, CdTe, HgS, HgSe, HgTe, BeS, BeSe, BeTe, MgS, MgSe, GeS, GeSe, GeTe , SnS, SnSe, SnTe, PbO , PbS, PbSe, PbTe, CuF, CuCl, CuInS 2, Cu 2 SnS 3, CuBr, CuI, Si 3 N 4, Ge 3 N 4, Al 2 O 3, (Al, Ga , In) 2 (S, Se , Te) 3, CIGS, CGS , and (ZnS) y (Cu x Sn 1 - and x S 2) 1-y (where, x is 0 <x <1, y is 0 <lt; y < 1). The quantum dot may have a core / shell structure or an alloy structure, and examples of the quantum dot having the core / shell structure or the ally structure include CdSe / ZnS, CdSe / ZnSe / ZnS, CdSe / CdSx CdSe / CdS / ZnS, CdSe / CdS / CdSe / CdSe / CdSe / CdSe / CdSe / CdSe / CdSe / CdSe / CdSe / CdSe / CdSe / CdSe / CdSe / / ZnS, CuInS 2 , / ZnS, and Cu 2 SnS 3 / ZnS.

The quantum dot preferably has an average particle diameter of 1 nm to 50 nm, preferably 2 nm to 30 nm, more preferably 2 nm to 20 nm. In this case, when the average particle diameter of the quantum dots is 50 Nm, it is preferable to use a quantum dot having an average particle size within the above range, because quantum dots that are separated from the nanofibers upon electrospinning or electrospinning may increase. Specifically, the red-based quantum dots include CdSe with an average particle diameter of 5.2 nm to 8 nm, the green quantum dots include CdSe with an average particle diameter of 3 nm to 4.5 nm, and these red quantum dots and green green quantum dots are mixed at a weight ratio of 1: Can be used.

The solvent of the quantum dot dispersion solution includes, for example, toluene, formamide, dimethylsulfoxide, dimethylformamide, acetic acid, isopropanol, and the like. And one or two solvents selected from acetonitrile, methoxyethanol, tetrahydrofuran, benzene, xylene, and cyclohexane.

The amount of the quantum dot in the quantum dot dispersion solution of the first step and / or the second step may be 0.5 to 5 parts by weight, preferably 0.8 to 3 parts by weight, based on 100 parts by weight of the polymer resin. If the amount of the quantum dots used is less than 0.5 parts by weight, there is a problem that the amount of the fluorescent material used must be increased for realizing white light, and the color reproducibility may be lowered. It is uneconomical to use more than 5 parts by weight. It is good to use.

The first mixed solution may be prepared by further adding a phosphor to the first mixed solution in the first step. The phosphor may be a general phosphor used in the related art, preferably a silicate-based phosphor, a sulfide-based phosphor , An oxynitride-based fluorescent material, a nitride-based fluorescent material and an aluminate-based fluorescent material may be used alone or in combination of two or more.

In one example, the phosphor is (Sr, Ca) B 4 O 7: Eu, BaMgAl 10 O 17: Eu, Y 2 O 3: Eu, InBO 3: Eu, YVO 4: Eu, YBO 3: Eu, (Y, Gd) BO 3: Eu, SrTiO 3: Eu, (Si, Al) 6 (O, N) 8: Eu, Y 2 O 2 S: Eu, La 2 O 2 S: Eu, (La, Mn, Sm) 2 O 2 S · Ga 2 O 3: Eu, (Ca, Sr) S: Eu, CaAlSiN 3: Eu, (Sr, Ca) AlSiN 3: Eu, Sr 2 Si 5 N 8: Eu, CaGa 2 S 4: Eu, SrGa 2 S 4: Eu , SrSi 2 O 2 N 2: Eu, BaGa 2 S 4: Eu, SrAl 2 O 4: Eu, BAM: Eu, (Ba, Sr, Ca) 2 SiO 4: Eu, ( Sr, Ba, Ca, Mg, Zn) 2 Si (OD) 4: Eu ( where, D is F, Cl, S, N, or Br), β-SiAlON: Eu , Ba 3 Si 6 O 12 N 2: Eu, Ba 2 MgSi 2 O 7 : Eu, Mg 2 SiO 4: Mn, Zn 3 (PO 4) 2: Mn, (Y, Gd) BO 3: Tb, Ca 3 (Sc, Mg) 2 Si 3 O 12 : Ce, Y 2 SiO 5 : Ce, Ca 3 Y 2 Si 6 O 8 : Ce, BaAl 12 O 19 : Mn, Y 3 Al 5 O 12 : Ce, Y 3 Al 5 O 12 : Tb, Zn 2 SiO 4 : Mn, InBO 3 : Tb, ZnS: Cu, and Ca 10 (PO 4 ) 6 Cl 2 may be used alone or in combination. Preferably, the red phosphors include Y 2 O 2 S: Eu, La 2 O 2 S: Eu, (La, Mn, Sm) 2 O 2 S 揃 Ga 2 O 3 : Eu, : Eu, CaAlSiN 3 : Eu, (Sr, Ca) AlSiN 3 : Eu and Sr 2 Si 5 N 8 : Eu. The green phosphor may include CaGa 2 S 4 : Eu , SrGa 2 S 4: Eu, SrSi 2 O 2 N 2: Eu, BaGa 2 S 4: Eu, SrAl 2 O 4: Eu, BAM: Eu, (Ba, Sr, Ca) 2 SiO 4: Eu, (Sr , Ba, Ca, Mg, Zn) 2 Si (OD) 4 : Eu wherein D is F, Cl, S, N, or Br, β-SiAlON: Eu, Ba 3 Si 6 O 12 N 2 : Eu, Ba 2 MgSi 2 O 7 : Eu, and Ca 3 (Sc, Mg) 2 Si 3 O 12 : Ce.

The phosphor preferably has an average particle diameter of 2,000 nm to 30,000 nm, preferably 5,000 nm to 25,000 nm, more preferably 6,000 nm to 16,000 nm.

When the first mixed solution contains the quantum dots and the fluorescent material at the same time, the quantum dots and the fluorescent material are mixed in a weight ratio of 1:10 to 40, preferably 1:10 to 25, more preferably 1:12 to 20, 20 weight ratio is advantageous in terms of securing a high color reproducibility. When the red-based quantum dots are used for the quantum dots, the green-based fluorescent material is mixed with the phosphors, or when the green-based quantum dots are used for the quantum dots, the red-based fluorescent material may be mixed with the phosphors.

In addition, in the case of forming aggregates in which nanofibers are laminated by using red-based quantum dots in the second mixed solution used for forming the fibrous web structure layer, the first mixed solution may include the green-based quantum dots and / In the case of forming aggregates in which nanofibers are laminated by using a green system quantum dot in the second mixed solution, the first mixed solution includes the red system quantum dots and / or the red system type phosphors to form the quantum dot layer 10 desirable.

The polymer resin of the first step and / or the second step may be at least one selected from the group consisting of polyethyleneterephthalate resin, polycarbonate resin, polyalkylmethacrylate resin, polymethacrylate resin, Polyvinylidene fluoride resin, polystyrene resin, polyvinyl chloride resin, styrene acrylonitrile copolymer resin, polyurethane resin, polyamide resin, A polyvinyl butyral, a silicone resin, a polyvinyl acetate resin and an unsaturated polyester resin may be used alone or in combination of two or more. A polyethylene terephthalate resin having excellent transparency, Polycarbonate resin, polyalkyl methacrylate resin and polyvinylidene fluoride resin may be used alone or in combination of two or more. For example, a polyalkyl methacrylate resin and a polyvinylidene fluoride resin may be mixed at a ratio of 5: 7: 3 to 5: 5.

The solvent of the first mixed solution in the first step and / or the solvent of the second mixed solution in the second step is a solvent capable of dissolving the polymer resin, and the solvent commonly used in the art can be used. It is preferable to use 500 to 20,000 parts by weight, preferably 600 to 5,000 parts by weight, and more preferably 650 to 1,500 parts by weight, based on 100 parts by weight of the resin composition, from the viewpoint of maintaining an appropriate viscosity for electrospinning or electrospraying of the mixed solution, The solvent of the mixed solution may be a solvent selected from the group consisting of dimethylsulfoxide, dimethylformamide, dimethylacetamide, acetone, toluene, formamide, acetic acid, acetonitrile, methoxyethanol, tetrahydrofuran, benzene, xylene, cyclohexane Or a mixture of two or more of them may be used.

The quantum dot layer in the first step has an average thickness of 30 탆 to 100 탆, preferably 35 탆 to 80 탆, and more preferably 40 탆 to 70 탆, which is advantageous in ensuring a color reproduction rate and in a thin screen .

The second step is a step of forming a nanofiber and an aggregate of nanofibers in the second mixed solution. In the second step, the second mixed solution is electrospun or electrospun on the upper surface of the quantum dot layer 10 to form a two- . In this case, it is preferable to perform electrospinning when the second mixed solution has a high concentration (high viscosity). When the second mixed solution has a low concentration (low viscosity), electrophoresis is performed to form nanofibers and aggregates of nanofibers .

By forming the second mixed solution without using the quantum dots, the fibrous web structure layer 20 of the form as shown in FIG. 3B or FIG. 3C can be formed. By producing the second mixed solution using the quantum dots, The web structure layer 20 may be formed in the form of 3d or 3e.

The two-step electrospinning or electrospinning is carried out so that the nanofibers have an average particle diameter of 200 nm to 1,000 nm, preferably 200 nm to 800 nm, and more preferably 250 nm to 600 nm. At this time, If it is too small at 200 nm, there may be a morphological instability and a problem of protrusion of a quantum dots. If it is more than 1,000 nm, there may be a problem that the diffuse reflection effect of light is reduced.

In step 2, a barrier material may be spin-coated or spray-coated on the surface of the nanofibers formed by the electrospinning or electrospinning to form an aggregate in which the barrier coating layer is formed. At this time, the barrier material may be one prepared by using a polymer resin which is a mixture of at least one selected from a polycarbonate resin, a polyalkyl methacrylate resin, a polymethacrylate resin and a polyvinylidene fluoride resin . It is preferable to use the same polymer resin as that of the second mixed solution in two steps in terms of improving bonding strength between the nanofiber and the barrier coating layer.

Step 3 is a step of drying the aggregated laminated nanofibers in Step 2 to form a fibrous web structure layer having a three-dimensional network structure on the quantum dot layer, wherein the fibrous web structure layer has an average thickness of 10 탆 to 500 탆, Preferably 20 mu m to 300 mu m, and more preferably 30 mu m to 150 mu m.

The drying is to remove the residual solvent and to further form a junction between the nanofibers and the nanofibers. The drying temperature may vary depending on the type of the solvent and the polymer resin, Lt; RTI ID = 0.0 &gt; C, &lt; / RTI &gt; followed by drying by hot air drying or the like.

And further comprising the step of laminating a barrier layer on the fibrous web structure layer after the third step.

Here, the resin used in the formation of the barrier layer in the four-step process may be a polymer resin in which one or more selected from a polycarbonate resin, a polyalkyl methacrylate resin, a polymethacrylate resin and a polyvinylidene fluoride resin are mixed , And it is preferable to use the same one as that of the two-stage polymer resin in terms of improving the bonding strength between the fibrous web structure layer and the barrier film (or coating layer).

The quantum dot sheet of the present invention having such a fibrous web structure has a structure in which the distance between the blue light source and the quantum dot sheet is 0.5 m and the measurement angle is 0.2,

Figure pat00002
(See CIE 1931 color coordinates in FIG. 6), the CIE x value and the CIE y value can satisfy the following color coordinate values of the equations (1) and (2).

 [Equation 1]

0.23? CIE x? 0.37, preferably 0.25? CIE x? 0.35, more preferably 0.26? CIE x? 0.32

 [Equation 2]

0.28? CIEy? 0.42, preferably 0.30? CIEy? 0.40, more preferably 0.30? CIEy? 0.37

Further, the quantum dot sheet of the present invention has a high color reproducibility of 100% or more, preferably 101% or more, more preferably 104% or more when viewed in NTSC 100% color area based on CIE 1931 color coordinates, .

In addition, the quantum dot sheet of the present invention can have a high luminance of 4,000 cd / m 2 or more, preferably 4,200 cd / m 2 or more, and more preferably 4,200 cd / m 2 to 5,500 cd / m 2 .

As shown schematically in FIG. 5, the backlight unit incorporating the light diffusion function integral type quantum dot sheet according to the present invention can be applied to the case where the diffusion sheet is omitted and the quantum dot sheet and the prism sheet are sequentially stacked on the upper face of the light guide plate BLU can be provided. A reflector may be disposed on a lower surface of the light guide plate of the BLU.

The diffusion function integrated diffusion sheet of the present invention can be applied to a liquid crystal display device, a light emitting diode (LED) display, and a light emitting diode (LED) lighting device requiring high color reproduction power. Further, since the diffusion function integral type quantum dot sheet of the present invention has a fibrous web structure, it can be applied to a flexible display, a flexible lighting apparatus and the like because of its excellent flexibility.

Hereinafter, the present invention will be described in more detail based on examples. However, the following examples are provided to aid understanding of the present invention and should not be construed as limiting the scope of the present invention by the following examples.

[ Example ]

Preparation Example  One : Red Qdot  Preparation of dispersion solution

A quantum dot dispersion solution in which CdSe having a PL wavelength peak of 650 to 660 nm and having an average particle size of 6 nm was dispersed in a toluene solvent was prepared.

Preparation Example  2 : Green system Qdot  Preparation of dispersion solution

A quantum dot dispersion solution in which a PL wavelength peak of 505 to 510 nm and an average particle diameter of 4 nm of CdSe were dispersed in a toluene solvent was prepared.

Preparation Example  3: Green system  Preparation of phosphor

A Ba 2 MgSi 2 O 7 : Eu phosphor powder having an average particle diameter of 8,215 nm was prepared

Example  One

A polymer resin containing polyvinylidene fluoride (PVDF) resin and polymethyl methacrylate (PMMA) resin in a weight ratio of 6: 4, a quantum dot dispersion solution of Preparation Example 1 and Preparation Example 2, and a solvent, dimethylacetamide And stirred to prepare a first mixed solution. At this time, the mixing ratio was 1.2 parts by weight of red-based quantum dots in the red-based dispersion solution, 2.8 parts by weight of green-based quantum dots in the green-based dispersion solution and 934 parts by weight of solvent, based on 100 parts by weight of the polymer resin.

The first mixed solution was spray-coated on a glass substrate to form a film-shaped quantum dot layer having an average thickness of 35 mu m.

Next, 930 parts by weight of dimethylacetamide as a solvent was mixed and stirred with respect to 100 parts by weight of a polymer resin containing polyvinylidene fluoride (PVDF) resin and polymethyl methacrylate (PMMA) resin in a weight ratio of 6: 4 The second mixed solution was electrospun on the top of the quantum dot layer, and then dried by hot air at 45 ° C to 48 ° C to form a fibrous web structure layer having an average thickness of 24 μm.

Next, the glass substrate was removed to prepare a two-layered diffusion function integrated quantum dot sheet having the quantum dot layer 10 and the fibrous web structure layer 20 having the shapes shown in Figs. 3A and 3B.

Example  2

A polymer resin containing polyvinylidene fluoride (PVDF) resin and polymethylmethacrylate (PMMA) resin in a weight ratio of 6: 4, a quantum dot dispersion solution of Preparation Example 1, a green-based phosphor of Preparation Example 3 and dimethylacetate Amide were mixed and stirred to prepare a first mixed solution. At this time, the mixing ratio was 1 part by weight of the red quantum dot in the red dispersion solution, 15 parts by weight of the green-based phosphor and 965 parts by weight of the solvent, based on 100 parts by weight of the polymer resin.

The first mixed solution was spray-coated on a glass substrate to form a film-shaped quantum dot layer having an average thickness of 41 mu m.

Next, 930 parts by weight of dimethylacetamide as a solvent was mixed and stirred with respect to 100 parts by weight of a polymer resin containing polyvinylidene fluoride (PVDF) resin and polymethyl methacrylate (PMMA) resin in a weight ratio of 6: 4 The second mixed solution was electrospun on the top of the quantum dot layer, and then dried by hot air at 45 ° C to 48 ° C to form a fibrous web structure layer having an average thickness of 24 μm.

Next, the glass substrate was removed to prepare a two-layered diffusion function integrated quantum dot sheet having the quantum dot layer 10 and the fibrous web structure layer 20 having the shape as shown in Fig. 3C.

Experimental Example  One : Color coordinates , Color recall  And luminance measurement

Using the quantum dot sheet manufactured in Examples 1 and 2, a color coordinate system measuring apparatus (BM-7 of Topcon) was used under the conditions of 0.5 m between the blue light source (500 W intensity) and the quantum dot sheet and the measurement angle of 0.2 ° 1.5 mm of the quantum dot sheet

Figure pat00003
(Refer to FIG. 6 based on CIE 1931 color coordinate system). The color reproduction rate and the luminance were measured in the NTSC 100% color area. In order to increase the accuracy of the measurement results, the analysis was performed five times, and the average value was calculated. The results are shown in Tables 1 and 2, respectively.

division Color coordinates Color recall Brightness (cd / m 2 ) CIE x CIE y 1 time 0.2712 0.3112 104.2 4,802 Episode 2 0.2714 0.3107 104.0 4,805 3rd time 0.2712 0.3111 104.2 4,817 4 times 0.2715 0.3115 104.3 4,799 5 times 0.2710 0.3120 104.2 4,806 Average 0.2713 0.3113 104.2 4,806

division Color coordinates Color recall Brightness (cd / m 2 ) CIE x CIE y 1 time 0.2744 0.3077 101.1 4,212 Episode 2 0.2736 0.3069 101.0 4,196 3rd time 0.2750 0.3072 101.2 4,201 4 times 0.2750 0.3072 101.3 4,202 5 times 0.2749 0.3074 101.3 4,212 Average 0.2746 0.3073 101.2 4.205

The quantum dot sheet of Example 1 has CIE x = 0.2713 and CIE y = 0.3113 color coordinates, and it is confirmed that the blue light source is realized as white light through the CIE 1931 color coordinates of FIG. 6 I could. It was confirmed that the color reproducibility was as high as 104.2%, and it was confirmed that it had a luminance higher than 4,806 cd / m 2 .

Further, the quantum dot sheet of Example 2 has a color coordinate of CIE x = 0.2746 and CIE y = 0.3073 in the quantum dot sheet, and it is confirmed that the blue light source is realized as white light through the CIE 1931 color coordinate in Fig. It was confirmed that the color reproducibility was as high as 101.2%, and that the quantum dot sheet of Example 2 also had a high luminance of 4,201 cd / m 2 or more.

Through the above-described embodiments and experimental examples, the BLU to which the diffusion function integral quantum dot sheet of the present invention is applied can transmit light of high luminance to the prism sheet without using a separate diffusion sheet, And / or thickness) can be reduced. The BLU can be applied to a liquid crystal display device, a light emitting diode (LED) display, and a light emitting diode (LED) lighting device requiring high color reproduction power. Further, since the quantum dot sheet of the present invention has excellent flexibility, it can be applied to a flexible display, a flexible lighting apparatus, and the like.

1: light guide plate (or light guide sheet) 2: light source
3: Reflector 4: Quantum dot sheet
5: diffusion sheet 6: prism sheet
10: Quantum dot layer 13: Phosphor
15: Red-based quantum dot 17: Green-based quantum dot
20: fibrous web structure layer 30: barrier layer
40: adhesive layer 100: light diffusion function integral quantum dot sheet

Claims (20)

A quantum dot layer comprising at least one selected from a quantum dot and a fluorescent material; And a fibrous web structure layer formed of an aggregate of nanofibers,
The fibrous web structure layer in the light transmission direction is stacked on top of the quantum dot layer,
And the fibrous web structure layer and the quantum dot layer are combined and integrated. The light-diffusion function integrated quantum dot sheet according to claim 1, wherein the nanofibers of the fibrous web structure layer include quantum dots. The light spreading function integrated quantum dot sheet according to claim 2, wherein the fibrous web structure layer further comprises a barrier layer on the upper side. [2] The method of claim 1, wherein the quantum dot of the quantum dot layer has a red quantum dot (PL) wavelength peak at 600 nm to 750 nm;
Yellow-based quantum dots having a PL wavelength peak of 550 nm to 600 nm; And
A green-based quantum dot having a PL wavelength peak of 490 nm to 530 nm; And at least one selected from among at least one quantum dot selected from among the quantum dots. The light spreading integrated quantum dot sheet according to claim 1, wherein the quantum dot layer includes a red-based quantum dot having a PL wavelength peak of 600 nm to 750 nm and a green-based fluorescent light having a PL wavelength peak of 490 nm to 530 nm. The nanofiber of claim 1, wherein the nanofibers of the fibrous web structure layer comprise red-colored quantum dots having a PL wavelength peak of 600 nm to 750 nm,
Wherein the quantum dot layer has a green system quantum dot having a PL wavelength peak of 490 nm to 530 nm; And a green-based phosphor having a PL wavelength peak of 490 nm to 530 nm; And the light diffusing function integral quantum dot sheet. The nanofiber of claim 1, wherein the nanofibers of the fibrous web structure layer comprise a green-based quantum dot having a PL wavelength peak of 490 nm to 530 nm,
Wherein the quantum dot layer has a red quantum dot having a PL wavelength peak of 490 nm to 530 nm; And a red fluorescent material having a PL wavelength peak of 490 nm to 530 nm; A light-diffusing-function-integral-type quantum-dot sheet. The organic electroluminescent device according to claim 1, wherein the quantum dot has an average particle diameter of 1 nm to 50 nm,
The phosphor has an average particle diameter of 2,000 nm to 30,000 nm,
The nanofibers have an average particle diameter of 200 nm to 2,000 nm,
The average thickness of the quantum dot layer is 30 탆 to 100 탆,
Wherein the average thickness of the fibrous web structure layer is 10 占 퐉 to 200 占 퐉. 9. The method of any one of claims 1 to 8, wherein the color coordinate system measuring device is used to measure the distance between the blue light source and the quantum dot sheet at a distance of 0.5 m and a measuring angle of 0.2,
Figure pat00004
Wherein the CIE x value and the CIE y value satisfy the color coordinate values of the following Equations (1) and (2) when measuring a color coordinate for the region:
[Equation 1]
0.25? CIE x? 0.35
[Equation 2]
0.30? CIEy? 0.40 9. The color reproduction system according to any one of claims 1 to 8, wherein the color reproduction ratio is 100% or more and the luminance is 4,000 cd / m 2 or more when viewed in an NTSC 100% color area based on the CIE 1931 color coordinate system. Quantum dot sheet. A backlight unit comprising the light diffusion function integral quantum dot sheet according to any one of claims 1 to 8. The backlight unit according to claim 11, wherein the quantum dot sheet and the prism sheet are stacked in order on the upper surface of the light guide plate. 13. The backlight unit according to claim 12, further comprising a reflection plate on a lower end face of the light guide plate. 8. A light emitting diode (LED) illumination device comprising the light diffusion function integral quantum dot sheet according to any one of claims 1 to 8. A liquid crystal display (LCD) comprising the backlight unit of claim 11. A light emitting diode (LED) display comprising the backlight unit of claim 11. A first step of preparing a quantum dot layer with a first mixed solution including a quantum dot dispersion solution, a polymer resin, and a solvent;
A second step of electrospinning or electrospinning a second mixed solution containing a polymer resin and a solvent on the quantum dot layer to form an aggregated layer of nanofibers; And
And a third step of drying the aggregated laminated nanofibers to form a fibrous web structure layer having a three-dimensional network structure. 18. The method of claim 17, wherein the first mixed solution further comprises a phosphor. 18. The method of claim 17, wherein the second mixed solution further comprises a quantum dot dispersion solution. The method of claim 17, wherein the drying in the third step is performed by hot air drying at 30 캜 to 60 캜.
KR1020150104512A 2015-07-23 2015-07-23 All-in-one quantumdot sheet having light diffusing function, Manufacturing method thereof and Back light unit containing the same KR20170011615A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150104512A KR20170011615A (en) 2015-07-23 2015-07-23 All-in-one quantumdot sheet having light diffusing function, Manufacturing method thereof and Back light unit containing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150104512A KR20170011615A (en) 2015-07-23 2015-07-23 All-in-one quantumdot sheet having light diffusing function, Manufacturing method thereof and Back light unit containing the same

Publications (1)

Publication Number Publication Date
KR20170011615A true KR20170011615A (en) 2017-02-02

Family

ID=58152030

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150104512A KR20170011615A (en) 2015-07-23 2015-07-23 All-in-one quantumdot sheet having light diffusing function, Manufacturing method thereof and Back light unit containing the same

Country Status (1)

Country Link
KR (1) KR20170011615A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
KR102271144B1 (en) * 2020-11-18 2021-06-30 (주)이노큐디 Light Diffusion Plate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120091441A (en) 2010-01-27 2012-08-17 알이엠 홀딩스 3, 엘엘씨 Card reader device and method of use
KR20140139680A (en) 2013-05-27 2014-12-08 주식회사 디에스 Method of manufacturing yag phosphor and white phosphor containing yag phosphor manufactured thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120091441A (en) 2010-01-27 2012-08-17 알이엠 홀딩스 3, 엘엘씨 Card reader device and method of use
KR20140139680A (en) 2013-05-27 2014-12-08 주식회사 디에스 Method of manufacturing yag phosphor and white phosphor containing yag phosphor manufactured thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
KR102271144B1 (en) * 2020-11-18 2021-06-30 (주)이노큐디 Light Diffusion Plate

Similar Documents

Publication Publication Date Title
US10571740B2 (en) Quantum dot sheet of fibrous-web structure, manufacturing method thereof, and backlight unit
US10416373B2 (en) Light emitting diode (LED) devices
US10158052B2 (en) LED based device with wide color gamut
KR20170011616A (en) All-in-one quantumdot sheet having light diffusing function for blue light source, Manufacturing method thereof and Back light unit containing the same
RU2633551C2 (en) Luminophore sheet
KR101712033B1 (en) Backlight Unit and Liquid Crystal Display Including Same
CN107209416B (en) Quantum dot thin film and method for manufacturing same
JP2013539170A (en) Backlight unit member using quantum dots and method for manufacturing the same
JP2020501296A (en) Backlight unit for display device
KR101977776B1 (en) Fiberous-web structure type quantumdot sheet, Manufacturing method thereof and Back light unit containing the same
KR20190137071A (en) Coated red-ray emitting phosphor
JP2024037888A (en) display device
KR102063670B1 (en) Fiberous-web structure type quantumdot sheet for BLU, Manufacturing method thereof and Back light unit containing the same
KR20170011615A (en) All-in-one quantumdot sheet having light diffusing function, Manufacturing method thereof and Back light unit containing the same
TWI506064B (en) Quantum dots/polymer composite films and method for manufacturing the same
CN207799288U (en) A kind of high colour gamut down straight aphototropism mode set
KR20130057354A (en) White light emitting diode and lighting apparatus including the same
KR102030839B1 (en) Difusion film for Back Light Unit and Manufacturing Method Thereof and Back Light Unit
JP2012036265A (en) Illuminating device
JP7361602B2 (en) Composite material with red emitting phosphor
KR101835111B1 (en) Liquid Crystal Display Device and Semiconductor Nanocrystal-Polymer Composite
KR102030840B1 (en) Prism film for Back Light Unit and Manufacturing Method Thereof and Back Light Unit
TW201915144A (en) Processes for preparing color stable red-emitting phosphors
KR101436099B1 (en) Dual quantum dot-polymer composite plate for light emitting diode and method for producing the same
JP2021009806A (en) Backlight module and display device