WO2016051760A1 - Élément de conversion de longueur d'onde, unité de rétroéclairage le comportant, et dispositif d'affichage à cristaux liquides - Google Patents

Élément de conversion de longueur d'onde, unité de rétroéclairage le comportant, et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2016051760A1
WO2016051760A1 PCT/JP2015/004914 JP2015004914W WO2016051760A1 WO 2016051760 A1 WO2016051760 A1 WO 2016051760A1 JP 2015004914 W JP2015004914 W JP 2015004914W WO 2016051760 A1 WO2016051760 A1 WO 2016051760A1
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Prior art keywords
wavelength conversion
film
light
layer
conversion member
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PCT/JP2015/004914
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English (en)
Japanese (ja)
Inventor
直良 山田
佐藤　宏一
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富士フイルム株式会社
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Priority claimed from JP2015164880A external-priority patent/JP6339053B2/ja
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Priority to CN201580052329.5A priority Critical patent/CN106716188B/zh
Publication of WO2016051760A1 publication Critical patent/WO2016051760A1/fr
Priority to US15/465,894 priority patent/US10408987B2/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters

Definitions

  • the present invention relates to a wavelength conversion member having a wavelength conversion layer including a quantum dot that emits fluorescence when irradiated with excitation light, a backlight unit including the wavelength conversion layer, and a liquid crystal display device.
  • the liquid crystal display device is composed of at least a backlight and a liquid crystal cell, and usually further includes members such as a backlight side polarizing plate and a viewing side polarizing plate.
  • the wavelength conversion member of the backlight unit has a structure including a wavelength conversion layer containing quantum dots (also referred to as Quantum Dot, QD, quantum dots) as a light emitting material. It is attracting attention (see Patent Document 1).
  • the wavelength conversion member is a member that converts the wavelength of light incident from the planar light source and emits it as white light.
  • the wavelength conversion layer that includes the quantum dots as the light emitting material two or three of different light emission characteristics are used.
  • White light can be realized by using fluorescence in which a seed quantum dot is excited by light incident from a planar light source and emits light.
  • Fluorescence due to quantum dots has high brightness and a small half-value width, so that LCDs using quantum dots are excellent in color reproducibility.
  • the color gamut is expanded from 72% to 100% of the current TV standard (FHD, NTSC (National Television System Committee)) ratio.
  • Patent Document 1 proposes laminating an oxygen barrier film on a layer containing quantum dots in order to protect the quantum dots from oxygen and the like.
  • the oxygen barrier film is usually used as a base film for sandwiching a layer containing quantum dots, by using a base material having an oxygen barrier property by using the base material itself as an oxygen barrier film, or on the surface of the base film.
  • a base material having an oxygen barrier property by using the base material itself as an oxygen barrier film, or on the surface of the base film.
  • An aspect in which an oxygen barrier property is imparted by laminating an inorganic layer or an organic layer having a barrier property is known.
  • the inorganic layer having oxygen barrier properties inorganic layers such as inorganic oxides, inorganic nitrides, inorganic oxynitrides, and metals are preferably used.
  • the base film is required to be an optical film having the highest possible transparency.
  • the transparency of the base film is usually evaluated by the total light transmittance of the film.
  • the total light transmittance is, for example, a value measured using a haze meter NDH4000 manufactured by Nippon Denshoku Industries Co., Ltd. Therefore, as the base film, an optical film having a reduced surface reflectance as compared with the base film having a high total light transmittance as described in Patent Document 2 is preferably used.
  • the optical film for reducing the reflectance of the surface, there are a method of providing an antireflection layer on the surface, and a method of appropriately adjusting the refractive index and film thickness in a functional layer such as an easy adhesion layer provided on the surface. It has been adopted.
  • the brightness of the backlight unit is not improved. It has become clear that there are cases in which the brightness is further reduced.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wavelength conversion member having a small optical loss in a wavelength conversion member having a wavelength conversion layer including quantum dots that emit fluorescence when irradiated with excitation light. Is. Another object of the present invention is to provide a high-brightness backlight unit and a liquid crystal display device including a wavelength conversion member with little optical loss.
  • the wavelength conversion member of the present invention is a wavelength conversion member comprising a wavelength conversion layer containing at least one kind of quantum dots that are excited by excitation light and emit fluorescence.
  • the wavelength conversion layer comprises a base film on at least one surface,
  • the base film has an absorptance of light having a wavelength of 450 nm measured using an integrating sphere of less than 0.9%, and a total light transmittance of less than 92%.
  • the base film may include a surface modification layer such as an easy adhesion layer on the surface.
  • the base film may further include a functional layer such as an oxygen barrier layer or a light diffusion layer.
  • the base film can be used as a base material for an oxygen barrier layer or a light diffusion layer.
  • the base film preferably includes an oxygen barrier layer including at least one inorganic layer formed in contact with the surface of the base film on the wavelength conversion layer side.
  • inorganic layers include inorganic layers containing silicon oxide, silicon nitride, silicon carbide, or aluminum oxide.
  • the oxygen barrier layer may include at least one organic layer between the base film and the inorganic layer, and at least one side of the inorganic layer on the side opposite to the base film side. You may provide the organic layer of a layer.
  • the “inorganic layer” is a layer mainly composed of an inorganic material, and preferably a layer formed only from an inorganic material.
  • the “organic layer” is a layer mainly composed of an organic material, and preferably refers to a layer in which the organic material occupies 50% by mass or more, more preferably 80% by mass or more, particularly 90% by mass or more. Shall.
  • the base film provided with the oxygen barrier layer preferably has an absorbance of light having a wavelength of 450 nm measured using an integrating sphere of less than 4.0% and a total light transmittance of less than 92%.
  • the base film is provided with a concavo-convex imparting layer that imparts a concavo-convex structure on a surface opposite to the surface on the wavelength conversion layer side.
  • the light-diffusion layer may be provided in the surface on the opposite side to the surface by the side of the wavelength conversion layer of a base film.
  • the base film is preferably provided on both main surfaces of the wavelength conversion layer.
  • the average film thickness of the base film is preferably 40 ⁇ m or less.
  • the average film thickness of the base film is a film thickness obtained by averaging five or more different film thicknesses of the base film.
  • the film thickness of the base film can be measured using, for example, an electronic micrometer “K-402B” manufactured by Anritsu Corporation.
  • As the substrate film one containing polyethylene terephthalate is suitable.
  • the backlight unit of the present invention is A planar light source that emits primary light;
  • the wavelength conversion member of the present invention provided on a planar light source;
  • a retroreflective member disposed opposite to the planar light source across the wavelength conversion member;
  • a backlight unit including a wavelength conversion member and a reflector disposed opposite to a surface light source,
  • the wavelength conversion member emits fluorescence using at least part of the primary light emitted from the planar light source as excitation light, and emits at least light including secondary light composed of the emitted fluorescence.
  • the liquid crystal display device of the present invention comprises the above-described backlight unit of the present invention and a liquid crystal unit disposed opposite to the retroreflective member side of the backlight unit.
  • the “half width” of a peak refers to the width of the peak at a peak height of 1/2.
  • light having the emission center wavelength in the wavelength band of 430 to 480 nm is called blue light
  • light having the emission center wavelength in the wavelength band of 500 to 600 nm is called green light
  • the emission center wavelength is in the wavelength band of 600 to 680 nm.
  • the light having a color is called red light.
  • the wavelength conversion member of the present invention is a wavelength conversion member comprising a wavelength conversion layer including at least one kind of quantum dot that is excited by excitation light to emit fluorescence, and is provided on at least one surface of the wavelength conversion layer, It comprises a substrate film having an absorption rate of light with a wavelength of 450 nm measured using an integrating sphere of less than 0.9% and a total light transmittance of less than 92%. According to this configuration, it is possible to provide a wavelength conversion member with little optical loss.
  • FIG. 1 is a schematic cross-sectional view of a backlight unit including the wavelength conversion member of the present embodiment
  • FIG. 2 is a schematic cross-sectional view of the wavelength conversion member of the present embodiment.
  • the scale of each part is appropriately changed and shown for easy visual recognition.
  • a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • the backlight unit 2 includes a light source 1A that emits primary light (blue light L B ) and a light guide plate 1B that guides and emits the primary light emitted from the light source 1A.
  • the wavelength conversion member 1 ⁇ / b> D includes a wavelength conversion layer 30 including quantum dots that are excited by excitation light to emit fluorescence, and substrate films 11 and 21 provided on both surfaces of the wavelength conversion layer 30.
  • the oxygen barrier layers 12 and 22 having the organic layers 12a and 22a and the inorganic layers 12b and 22b are formed on the base film 11 and the surface of the base films 11 and 21 on the wavelength conversion layer 30 side. 21 is formed in contact with.
  • the base film 11 is provided with the uneven
  • the unevenness imparting layer (matte layer) 13 also has a function as a light diffusion layer.
  • Wavelength converting layer 30 has a quantum dot 30A that emits when excited fluorescence (red light) L R by the blue light L B in the organic matrix 30P, a being excited by the blue light L B fluorescence (green light) L G
  • the quantum dots 30B that emit light are dispersed.
  • the quantum dots 30A and 30B are greatly illustrated for easy visual recognition, but in actuality, for example, the diameter of the quantum dots is about 2 to 7 nm with respect to the thickness of the wavelength conversion layer 30 of 50 to 100 ⁇ m. It is.
  • L B , L G , and L R emitted from the wavelength conversion member 1D are incident on the retroreflective member 2B, and each incident light is transmitted between the retroreflective member 2B and the reflector 2A. The reflection is repeated and passes through the wavelength conversion member 1D many times.
  • a sufficient amount of excitation light blue light L B
  • a necessary amount of fluorescence L G , L R
  • the white light LW is embodied and emitted from 2B.
  • the light loss due to the base films 11 and 21 included in the wavelength conversion member 1D is integrated and increased by the repetition of the reflection. Therefore, in a backlight unit designed to increase the number of repetitions, such as a backlight unit in which the amount of quantum dots contained in the wavelength conversion layer is reduced, the optical loss in the base films 11 and 12 is reduced. There will be greatly affects the color and brightness of the white light L w.
  • the quantum dots used for the wavelength conversion member include those containing cadmium and selenium, which are excellent in terms of the emission quantum yield and emission wavelength, and can be suitably used for the wavelength conversion member. Usage is severely restricted from the viewpoint of environmental safety. Therefore, it is desired to reduce the amount of quantum dots used in the wavelength conversion layer. In order to achieve the same color and brightness while reducing the amount of quantum dots used, it is necessary to repeat more retroreflections. That is, it is necessary to reduce the optical loss in the base films 11 and 12 as much as possible.
  • the present inventors diligently studied the factors that cause such a phenomenon and the solutions. As a result, the present inventors presume the reason for this as follows.
  • the total light transmittance which is an index usually used for evaluating the transparency of an optical film, is defined by the amount of light that is irradiated through the film and transmitted through the film. Light loss due to reflection of light on the surface and light loss due to absorption in the film are included. Therefore, when the light loss due to reflection is large, the total light transmittance is low even if the light loss due to absorption is very small. Normally, such a film has low transparency and is preferable as an optical film. Judged not to exist.
  • the white light is realized by repeating the reflection between the retroreflective member and the reflection plate many times, the light reflected on the surface of the base film is other than that. It can be used to excite the quantum dots without being reflected again by the member and causing optical loss. Therefore, even if the reflection on the surface of the base film is large to some extent, it does not lead to reducing the luminance of the backlight unit. That is, even if it is a film with a low total light transmittance, it may be preferable as a base film of a wavelength conversion member.
  • the film in which the reflection in the surface of a base film is small and the optical loss by absorption is large may be unpreferable as a base film of a wavelength conversion member.
  • the base film has a total light transmittance of less than 92% in addition to an absorbance of light having a wavelength of 450 nm measured using an integrating sphere of less than 0.9%.
  • the absorption rate of light having a wavelength of 450 nm measured using an integrating sphere is less than 0.9% and the total light transmittance is less than 92%, the reflection on the surface of the film becomes large, and the retroreflection of Efficiency can be improved, and a backlight unit with higher brightness can be obtained with less quantum dot usage.
  • a polyethylene terephthalate film generally used as an optical film has a higher surface reflectance than a commonly used triacetyl cellulose film, the total light transmittance is low. Nevertheless, the present inventors have confirmed that when a polyethylene terephthalate film is used as the base film of the wavelength conversion member, the luminance can be increased more than when a triacetyl cellulose film is used.
  • the present inventors have determined that the base film of the wavelength conversion member is not a total light transmittance, but a light absorption rate measured by installing a sample in the integrating sphere according to the method described later. We found that gender must be evaluated. Inside the integrating sphere, the light reflected by the sample surface is also reflected again by the integrating sphere and finally detected by the measuring instrument, so this method is not affected by the reflection on the sample surface and is reflected many times. In a system in which is repeated, the amount of light absorbed by the sample can be correctly evaluated.
  • the present inventors have found that the base film of the wavelength conversion member needs to have an optical absorptance of less than 0.9% measured using an integrating sphere.
  • the substrate films 11 and 21 provided on both surfaces of the wavelength conversion layer 30 have an absorptance of light with a wavelength of 450 nm measured using an integrating sphere of 0.9%. Is less than.
  • each component of the wavelength conversion member 1D will be described.
  • the base films 11 and 21 used for the wavelength conversion member 1D have an absorptance of light with a wavelength of 450 nm measured using an integrating sphere of less than 0.9%.
  • the absorption rate of light having a wavelength of 450 nm, measured using an integrating sphere, of the base films 11 and 21 is preferably less than 0.7%, and more preferably less than 0.5%.
  • the total light transmittance of the base films 11 and 21 is less than 92%. It has been found that the total light transmittance of the base films 11 and 21 is more preferably 91% or less, and further preferably 90% or less. When a film having an absorption rate of 450 nm wavelength light measured using an integrating sphere of less than 0.9% and a total light transmittance of less than 92% is used, the light reflectance on the film surface is compared. When incorporated in a wavelength conversion member, the number of times that excitation light passes through the wavelength conversion layer can be increased, so that the wavelength conversion layer can be maintained while maintaining the display color of the LCD properly and suppressing the decrease in luminance. The density
  • concentration of the quantum dot in can be reduced, or the thickness of a wavelength conversion layer can be reduced.
  • the retroreflective member of the backlight unit is used to maintain the display color of the LCD. It is necessary to increase the number of times the excitation light passes through the wavelength conversion layer by providing means for increasing retroreflection of light, such as providing a plurality of prism sheets in 2B. According to the wavelength conversion member 1D, even when the number of times the excitation light passes through the wavelength conversion layer increases, the absorption rate of light having a wavelength of 450 nm measured using the integrating spheres of the base films 11 and 21 is 0.9. Since it is less than%, the brightness of the LCD is not greatly reduced.
  • the base films 11 and 21 may be layers adjacent to or directly in contact with the wavelength conversion layer, and may be included as a base film of the oxygen barrier film 10 or 20 described later.
  • the wavelength conversion layer 30 has at least one main surface supported by the base film 11 or 21.
  • the “main surface” refers to the surface (front surface, back surface) of the wavelength conversion layer disposed on the viewing side or the backlight side when the wavelength conversion member is used. The same applies to the main surfaces of the other layers and members.
  • this wavelength conversion layer 30 it is preferable that the main surfaces of the front and back of the wavelength conversion layer 30 are supported by the base film 11 and 21 like this embodiment.
  • the average film thickness of the base films 11 and 21 is preferably 40 ⁇ m or less, and more preferably 25 ⁇ m or less.
  • a thin thickness is preferable because it can further reduce the absorptance of light having a wavelength of 450 nm measured using an integrating sphere, and can suppress a decrease in luminance.
  • the thickness of the base film is preferably 10 ⁇ m or more.
  • the in-plane retardation Re (589) in wavelength 589nm is 1000 nm or less in the base films 11 and 21. More preferably, it is 500 nm or less, and further preferably 200 nm or less.
  • the wavelength conversion member 1D After the wavelength conversion member 1D is manufactured, when inspecting for the presence of foreign matter or defects, two polarizing plates are placed in the extinction position, and the wavelength conversion member is inserted between them for observation, making it easy to find foreign matters and defects.
  • Re (589) of the base film is in the above range because foreign matters and defects can be found more easily during inspection using a polarizing plate.
  • Re (589) is measured with KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments Co., Ltd.) by making light having a wavelength of 589 nm incident in the normal direction of the film.
  • the wavelength selection filter can be exchanged manually, or the measurement value can be converted by a program or the like.
  • the base films 11 and 21 are preferably base films having oxygen barrier properties.
  • Preferred examples of the base film include a polyethylene terephthalate film, a film made of a polymer having a cyclic olefin structure, and a polystyrene film.
  • the base films 11 and 21 are preferably provided with oxygen barrier layers 12 and 22 including at least one inorganic layer 12b and 22b formed in contact with the surface on the wavelength conversion layer 30 side.
  • the oxygen barrier layers 12 and 22 may include at least one organic layer 12a and 22a between the base films 11 and 21 and the inorganic layers 12b and 22b.
  • the organic layers 12 a and 22 a may be provided between the inorganic layers 12 b and 22 b and the wavelength conversion layer 30. Laminating a plurality of layers is preferable from the viewpoint of improving light resistance because the barrier property can be further improved.
  • the oxygen barrier layers 12 and 22 are formed by forming films on the surfaces of the base films 11 and 21 as a support. Accordingly, the oxygen barrier films 10 and 20 are constituted by the base films 11 and 21 and the oxygen barrier layers 12 and 22 provided thereon. In the case where the oxygen barrier layers 12 and 20 are provided, the base film preferably has high heat resistance.
  • the layer in the oxygen barrier films 10 and 20 adjacent to the wavelength conversion layer 30 may be an inorganic layer or an organic layer, and is not particularly limited.
  • the oxygen permeability of the oxygen barrier films 10 and 20 is preferably 1.00 cm 3 / (m 2 ⁇ day ⁇ atm) or less.
  • the oxygen permeability is a value measured using an oxygen gas permeability measuring device (manufactured by MOCON, OX-TRAN 2/20: trade name) under the conditions of a measurement temperature of 23 ° C. and a relative humidity of 90%. It is.
  • the oxygen permeability of the oxygen barrier films 10 and 20 is more preferably 0.10 cm 3 / (m 2 ⁇ day ⁇ atm) or less, and still more preferably 0.01 cm 3 / (m 2 ⁇ day ⁇ atm) or less. is there.
  • the oxygen barrier films 10 and 20 preferably have a function of blocking water vapor in addition to a gas barrier function of blocking oxygen.
  • the inorganic layers 12b and 22b suitable for the oxygen barrier layers 12 and 22 are not particularly limited, and various inorganic compounds such as metals, inorganic oxides, nitrides, and oxynitrides can be used.
  • silicon, aluminum, magnesium, titanium, tin, indium and cerium are preferable, and one or two or more of these may be included.
  • Specific examples of the inorganic compound include silicon oxide, silicon oxynitride, aluminum oxide, magnesium oxide, titanium oxide, tin oxide, indium oxide alloy, silicon nitride, aluminum nitride, and titanium nitride.
  • a metal film such as an aluminum film, a silver film, a tin film, a chromium film, a nickel film, or a titanium film may be provided.
  • an inorganic layer containing silicon oxide, silicon nitride, silicon oxynitride, silicon carbide, or aluminum oxide is particularly preferable. Since the inorganic layer made of these materials has good adhesion to the organic layer, even when the inorganic layer has pinholes, the organic layer can effectively fill the pinholes, and the barrier property is further improved. It can be made even higher. Further, silicon nitride is most preferable from the viewpoint of suppressing light absorption in the oxygen barrier layer.
  • the method for forming the inorganic layer is not particularly limited, and for example, various film forming methods capable of evaporating or scattering the film forming material and depositing it on the deposition surface can be used.
  • Examples of the method for forming the inorganic layer include a vacuum evaporation method in which an inorganic material such as an inorganic oxide, an inorganic nitride, an inorganic oxynitride, or a metal is heated and evaporated; an inorganic material is used as a raw material, and oxygen gas is introduced.
  • an inorganic material such as an inorganic oxide, an inorganic nitride, an inorganic oxynitride, or a metal is heated and evaporated; an inorganic material is used as a raw material, and oxygen gas is introduced.
  • Oxidation reaction vapor deposition method for oxidizing and vapor deposition sputtering method using inorganic material as target raw material, introducing argon gas and oxygen gas and performing sputtering; plasma generated on inorganic material with plasma gun
  • a vapor deposition film of silicon oxide is formed by a physical vapor deposition method (Physical Vapor Deposition method, PVD method) such as an ion plating method that is heated by a beam for vapor deposition, a plasma chemical vapor that uses an organosilicon compound as a raw material is used.
  • Phase growth method Cerhemical Vapor Deposition method
  • the thickness of the inorganic layer may be 1 nm to 500 nm, preferably 5 nm to 300 nm, and more preferably 10 nm to 150 nm.
  • the film thickness of the adjacent inorganic layer is within the above-described range, it is possible to suppress absorption of light in the inorganic layer while realizing good barrier properties, and provide a wavelength conversion member with higher light transmittance. Because it can be done.
  • Organic layer JP, 2007-290369, A paragraphs 0020-0042 and JP, 2005-096108, A paragraphs 0074-0105 can be referred to as an organic layer.
  • the organic layer preferably contains a cardo polymer.
  • the adhesiveness between the organic layer and the adjacent layer, particularly the adhesiveness with the inorganic layer is improved, and a further excellent gas barrier property can be realized.
  • the thickness of the organic layer is preferably in the range of 0.05 ⁇ m to 10 ⁇ m, and more preferably in the range of 0.5 to 10 ⁇ m.
  • the thickness of the organic layer is preferably in the range of 0.5 to 10 ⁇ m, and more preferably in the range of 1 to 5 ⁇ m. Further, when formed by a dry coating method, it is preferably in the range of 0.05 ⁇ m to 5 ⁇ m, and more preferably in the range of 0.05 ⁇ m to 1 ⁇ m. This is because when the film thickness of the organic layer formed by the wet coating method or the dry coating method is within the above-described range, the adhesion with the inorganic layer can be further improved.
  • the base films 11 and 21 include an unevenness imparting layer (matte layer) that imparts an uneven structure on the surface opposite to the surface on the wavelength conversion layer 30 side. It is preferable that the base film has a matte layer because the blocking property and slipperiness of the base film can be improved.
  • the mat layer is preferably a layer containing particles. Examples of the particles include inorganic particles such as silica, alumina, and metal oxide, or organic particles such as crosslinked polymer particles.
  • the mat layer is preferably provided on the surface of the base film opposite to the wavelength conversion layer, but may be provided on both surfaces.
  • the wavelength conversion member 1D can have a light diffusion function in order to efficiently extract the fluorescence of the quantum dots to the outside.
  • the light diffusion function may be provided inside the wavelength conversion layer 30, or a layer having a light diffusion function may be separately provided as the light diffusion layer.
  • the unevenness providing layer and the light diffusing layer can be used as in the present embodiment. Scattering in the light diffusion layer may depend on scattering particles or surface irregularities.
  • quantum dots 30A As the wavelength converting layer 30 has been already described, and the quantum dots 30A, is excited by the blue light L B fluorescence (green is excited by the blue light L B emit fluorescence (red light) L R in an organic matrix 30P quantum dots 30B for emitting light) L G is dispersed.
  • the organic matrix 30P contains a polymer (polymer), and the wavelength conversion layer 30 can be formed from a quantum dot-containing polymerizable composition containing quantum dots 30A, 30B, and 30C and a polymerizable compound. That is, the wavelength conversion layer 30 is preferably a cured layer obtained by curing the quantum dot-containing polymerizable composition.
  • the shape of the wavelength conversion layer is not particularly limited, and can be an arbitrary shape.
  • Quantum dots may contain different two or more quantum dot emission characteristics, in this embodiment, quantum dots, and quantum dots 30A are excited by the blue light L B which emits fluorescence (red light) L R a quantum dot 30B that emits when excited by the blue light L B fluorescence (green light) L G. Moreover, the quantum dots 30A are excited by ultraviolet light L UV to emit fluorescence (red light) L R, and the quantum dots 30B that emits fluorescence (green light) L G is excited by the ultraviolet light L UV, ultraviolet light L UV by being excited can also include quantum dots 30C that emits fluorescence (blue light) L B.
  • the known quantum dots include a quantum dot 30A having an emission center wavelength in the wavelength band of 600 nm to 680 nm, a quantum dot 30B having an emission center wavelength in the wavelength band of 500 nm to 600 nm, and a wavelength band of 400 nm to 500 nm.
  • a quantum dot 30C (emitting blue light) having an emission center wavelength is known.
  • the red light L R emitted by the quantum dots 30A may be embodied and the green light L G emitted by the quantum dots 30B, the blue light L B having passed through the wavelength conversion layer 30, a white light.
  • the ultraviolet light as the excitation light is incident on the wavelength conversion layer 30 including the quantum dots 30A, 30B, and 30C, whereby red light emitted from the quantum dots 30A and the quantum dots 30B are emitted.
  • White light can be realized by the emitted green light and the blue light emitted by the quantum dots 30C.
  • quantum dots in addition to the above description, for example, JP 2012-169271 A paragraphs 0060 to 0066 can be referred to, but the quantum dots are not limited thereto.
  • quantum dots for example, core-shell type semiconductor nanoparticles are preferable from the viewpoint of improving durability.
  • the core II-VI semiconductor nanoparticles, III-V semiconductor nanoparticles, multi-component semiconductor nanoparticles, and the like can be used. Specific examples include CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, InP, InAs, and InGaP, but are not limited thereto. Among these, CdSe, CdTe, InP, and InGaP are preferable from the viewpoint of emitting visible light with high efficiency.
  • the shell CdS, ZnS, ZnO, GaAs, and a composite thereof can be used, but the shell is not limited thereto.
  • the emission wavelength of the quantum dots can usually be adjusted by the composition and size of the particles.
  • the quantum dots may be spherical particles, may be rod-like particles called quantum rods, and may be tetrapod-type particles. From the viewpoint of narrowing the light emission half width (FWHM) and expanding the color reproduction range of the liquid crystal display device, spherical quantum dots or rod-like quantum dots (that is, quantum rods) are preferable.
  • a ligand having a Lewis basic coordinating group may be coordinated on the surface of the quantum dot.
  • Lewis basic coordinating groups include amino groups, carboxy groups, mercapto groups, phosphine groups, and phosphine oxide groups. Specific examples include hexylamine, decylamine, hexadecylamine, octadecylamine, oleylamine, myristylamine, laurylamine, oleic acid, mercaptopropionic acid, trioctylphosphine, and trioctylphosphine oxide. Of these, hexadecylamine, trioctylphosphine, and trioctylphosphine oxide are preferable, and trioctylphosphine oxide is particularly preferable.
  • Quantum dots coordinated with these ligands can be produced by a known synthesis method. For example, C.I. B. Murray, D.M. J. et al. Norris, M.M. G. Bawendi, Journal American Chemical Society, 1993, 115 (19), pp 8706-8715, or The Journal Physical Chemistry, 101, pp 9463-9475, 1997.
  • the quantum dot which the ligand coordinated can use a commercially available thing without a restriction
  • Lumidot manufactured by Sigma Aldrich
  • the thickness of the wavelength conversion layer 30 is preferably in the range of 1 to 500 ⁇ m, more preferably in the range of 10 to 250 ⁇ m, and still more preferably in the range of 30 to 150 ⁇ m.
  • a thickness of 1 ⁇ m or more is preferable because a high wavelength conversion effect can be obtained. Further, it is preferable that the thickness is 500 ⁇ m or less because the backlight unit can be thinned when incorporated in the backlight unit.
  • the wavelength conversion member 1D is configured.
  • Wavelength conversion member 1D the fluorescence L R is excited by the excitation light L B, be one having a wavelength conversion layer 30 including the quantum dots that emit L G, on at least one surface of the wavelength conversion layer 30, the integral
  • the substrate films 11 and 21 having an absorptance of light having a wavelength of 450 nm measured using a sphere of less than 0.9% are provided. According to such a configuration, the wavelength conversion member 1D with little optical loss can be obtained.
  • the retroreflection of the backlight unit is performed to maintain the display color of the LCD. Even when the number of times that the excitation light passes through the wavelength conversion layer is increased by providing means for increasing the retroreflection of light, such as providing a plurality of prism sheets on the property member 2B, the base films 11 and 21 are Since the absorptance is satisfied, the wavelength conversion member 1D does not decrease the luminance of the LCD.
  • the wavelength conversion layer 30 can be formed by applying a quantum dot-containing polymerizable composition to the surfaces of the oxygen barrier films 10 and 20 and then curing it by light irradiation or heating.
  • Application methods include curtain coating, dip coating, spin coating, print coating, spray coating, slot coating, roll coating, slide coating, blade coating, gravure coating, wire bar method, etc. A well-known coating method is mentioned.
  • Curing conditions can be appropriately set according to the type of polymerizable compound used and the composition of the polymerizable composition. Moreover, when a quantum dot containing polymeric composition is a composition containing a solvent, you may give a drying process for solvent removal before hardening.
  • the curing of the quantum dot-containing polymerizable composition may be performed in a state where the quantum dot-containing polymerizable composition is sandwiched between two substrate films.
  • One aspect of the manufacturing process of the wavelength conversion member including such a curing process will be described below with reference to FIGS.
  • the present invention is not limited to the following embodiments.
  • FIG. 3 is a schematic configuration diagram of an example of a manufacturing apparatus for the wavelength conversion member 1D
  • FIG. 4 is a partially enlarged view of the manufacturing apparatus shown in FIG.
  • the manufacturing process of the wavelength conversion member using the manufacturing apparatus shown in FIGS. 3 and 4 includes a quantum dot-containing polymerizable composition on the surface of the first oxygen barrier film 10 (hereinafter referred to as “first film”) that is continuously conveyed.
  • Second film Laminating (superimposing) a second oxygen barrier film 20 (hereinafter also referred to as “second film”) that is continuously conveyed on the coating film, and a step of applying an object to form a coating film; Any of the first film and the second film in the state where the coating film is sandwiched between the first film and the second film, and the coating film is sandwiched between the first film and the second film. At least a step of wrapping around a backup roller, irradiating with light while continuously conveying, polymerizing and curing the coating film to form a wavelength conversion layer (cured layer).
  • a barrier film having a barrier property against oxygen or moisture as either the first film or the second film
  • a wavelength conversion member having one surface protected by the barrier film can be obtained.
  • the wavelength conversion member 1D by which the both surfaces of the wavelength conversion layer were protected by the barrier film can be obtained by using a barrier film as a 1st film and a 2nd film, respectively.
  • the first film 10 is continuously conveyed from the unillustrated transmitter to the coating unit 120.
  • the first film 10 is delivered from the delivery device at a conveyance speed of 1 to 50 m / min. However, it is not limited to this conveyance speed.
  • a tension of 20 to 150 N / m, preferably 30 to 100 N / m is applied to the first film 10.
  • the quantum dot containing polymeric composition (henceforth "application liquid” is also applied) is apply
  • a die coater 124 and a backup roller 126 disposed to face the die coater 124 are installed.
  • the surface opposite to the surface on which the coating film 30M of the first film 10 is formed is wound around the backup roller 126, and the coating liquid is applied from the discharge port of the die coater 124 onto the surface of the first film 10 that is continuously conveyed.
  • the coating film 30M is formed.
  • the coating film 30 ⁇ / b> M refers to a quantum dot-containing polymerizable composition before being applied on the first film 10.
  • the die coater 124 to which the extrusion coating method is applied is shown as the coating apparatus, but the present invention is not limited to this.
  • a coating apparatus to which various methods such as a curtain coating method, an extrusion coating method, a rod coating method, or a roll coating method are applied can be used.
  • the first film 10 that has passed through the coating unit 120 and has the coating film 30M formed thereon is continuously conveyed to the laminating unit 130.
  • the second film 20 continuously conveyed is laminated on the coating film 30 ⁇ / b> M, and the coating film 30 ⁇ / b> M is sandwiched between the first film 10 and the second film 20.
  • a laminating roller 132 and a heating chamber 134 surrounding the laminating roller 132 are installed in the laminating unit 130.
  • the heating chamber 134 is provided with an opening 136 for allowing the first film 10 to pass therethrough and an opening 138 for allowing the second film 20 to pass therethrough.
  • a backup roller 162 is disposed at a position facing the laminating roller 132.
  • the first film 10 on which the coating film 30M is formed is wound around the backup roller 162 on the surface opposite to the surface on which the coating film 30M is formed, and is continuously conveyed to the laminating position P.
  • Lamination position P means the position where the contact between the second film 20 and the coating film 30M starts.
  • the first film 10 is preferably wound around the backup roller 162 before reaching the laminating position P. This is because even if wrinkles occur in the first film 10, the wrinkles are corrected and removed by the backup roller 162 before reaching the laminate position P.
  • the position (contact position) where the first film 10 is wound around the backup roller 162 and the distance L1 to the laminate position P are preferably long, for example, 30 mm or more is preferable, and the upper limit is usually It is determined by the diameter of the backup roller 162 and the pass line.
  • the second film 20 is laminated by the backup roller 162 and the laminating roller 132 used in the curing unit 160. That is, the backup roller 162 used in the curing unit 160 is also used as a roller used in the laminating unit 130.
  • the present invention is not limited to the above form, and a laminating roller may be installed in the laminating unit 130 in addition to the backup roller 162 so that the backup roller 162 is not used.
  • the backup roller 162 used in the curing unit 160 in the laminating unit 130, the number of rollers can be reduced.
  • the backup roller 162 can also be used as a heat roller for the first film 10.
  • the second film 20 sent from a sending machine (not shown) is wound around the laminating roller 132 and continuously conveyed between the laminating roller 132 and the backup roller 162.
  • the second film 20 is laminated on the coating film 30M formed on the first film 10 at the laminating position P. Thereby, the coating film 30 ⁇ / b> M is sandwiched between the first film 10 and the second film 20.
  • Lamination refers to laminating the second film 20 on the coating film 30M.
  • the distance L2 between the laminating roller 132 and the backup roller 162 is a value of the total thickness of the first film 10, the wavelength conversion layer (cured layer) 30 obtained by polymerizing and curing the coating film 30M, and the second film 20.
  • the above is preferable.
  • L2 is below the length which added 5 mm to the total thickness of the 1st film 10, the coating film 30M, and the 2nd film 20.
  • FIG. By making the distance L2 equal to or less than the total thickness plus 5 mm, it is possible to prevent bubbles from entering between the second film 20 and the coating film 30M.
  • the distance L2 between the laminating roller 132 and the backup roller 162 is the shortest distance between the outer circumferential surface of the laminating roller 132 and the outer circumferential surface of the backup roller 162.
  • Rotational accuracy of the laminating roller 132 and the backup roller 162 is 0.05 mm or less, preferably 0.01 mm or less in radial runout. The smaller the radial runout, the smaller the thickness distribution of the coating film 30M.
  • the difference between the temperature of the backup roller 162 of the curing unit 160 and the temperature of the first film 10 is preferably 30 ° C. or less, more preferably 15 ° C. or less, and most preferably the same.
  • the heating chamber 134 In order to reduce the difference from the temperature of the backup roller 162, when the heating chamber 134 is provided, it is preferable to heat the first film 10 and the second film 20 in the heating chamber 134.
  • hot air is supplied to the heating chamber 134 by a hot air generator (not shown) to heat the first film 10 and the second film 20.
  • the first film 10 may be heated by the backup roller 162 by being wound around the temperature-adjusted backup roller 162.
  • the second film 20 can be heated by the laminating roller 132 by using the laminating roller 132 as a heat roller.
  • the heating chamber 134 and the heat roller are not essential, and can be provided as necessary.
  • the first film 10 and the second film 20 are continuously conveyed to the curing unit 160 in a state where the coating film 30M is sandwiched between the first film 10 and the second film 20.
  • curing in the curing unit 160 is performed by light irradiation.
  • the polymerizable compound contained in the quantum dot-containing polymerizable composition is polymerized by heating, such as spraying hot air Curing can be performed by heating.
  • a light irradiation device 164 is provided at a position facing the backup roller 162 and the backup roller 162.
  • the first film 10 and the second film 20 sandwiching the coating film 30M are continuously conveyed between the backup roller 162 and the light irradiation device 164.
  • an ultraviolet-ray is mentioned as an example.
  • the ultraviolet light means light having a wavelength of 280 to 400 nm.
  • a light source that generates ultraviolet rays for example, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, or the like can be used.
  • the light irradiation amount may be set within a range in which polymerization and curing of the coating film can proceed.
  • the coating film 30M can be irradiated with ultraviolet rays having an irradiation amount of 100 to 10,000 mJ / cm 2 .
  • the first film 10 is wound around the backup roller 162 in a state where the coating film 30 ⁇ / b> M is sandwiched between the first film 10 and the second film 20, and is continuously conveyed from the light irradiation device 164.
  • the wavelength conversion layer (cured layer) 30 can be formed by performing light irradiation to cure the coating film 30M.
  • the first film 10 side is wound around the backup roller 162 and continuously conveyed, but the second film 20 may be wound around the backup roller 162 and continuously conveyed.
  • Wrapping around the backup roller 162 refers to a state in which either the first film 10 or the second film 20 is in contact with the surface of the backup roller 162 at a certain wrap angle. Accordingly, the first film 10 and the second film 20 move in synchronization with the rotation of the backup roller 162 while being continuously conveyed. Winding around the backup roller 162 may be at least during the irradiation of ultraviolet rays.
  • the backup roller 162 includes a cylindrical main body and rotating shafts disposed at both ends of the main body.
  • the main body of the backup roller 162 has a diameter of ⁇ 200 to 1000 mm, for example. There is no restriction on the diameter ⁇ of the backup roller 162. In consideration of curl deformation of the laminated film, equipment cost, and rotational accuracy, the diameter is preferably 300 to 500 mm.
  • the temperature of the backup roller 162 takes into consideration the heat generation during light irradiation, the curing efficiency of the coating film 30M, and the occurrence of wrinkle deformation on the backup roller 162 of the first film 10 and the second film 20. Can be determined.
  • the backup roller 162 is preferably set to a temperature range of 10 to 95 ° C., for example, and more preferably 15 to 85 ° C.
  • the temperature related to the roller refers to the surface temperature of the roller.
  • the distance L3 between the laminate position P and the light irradiation device 164 can be set to 30 mm or more, for example.
  • the coating film 30M becomes the cured layer 30 by light irradiation, and the wavelength conversion member 1D including the first film 10, the cured layer 30, and the second film 20 is manufactured.
  • the wavelength conversion member 1D is peeled off from the backup roller 162 by the peeling roller 180.
  • the wavelength conversion member 1D is continuously conveyed to a winder (not shown), and then the wavelength conversion member 1D is wound into a roll by the winder.
  • the present invention is not limited to the above aspect.
  • a wavelength conversion layer (cured layer) may be produced by curing.
  • One or more other layers such as an inorganic layer may be laminated on the prepared wavelength conversion layer by a known method.
  • the backlight unit 2 shown in FIG. 1 includes a light source 1A that emits primary light (blue light L B ), and a light guide plate 1B that guides and emits primary light emitted from the light source 1A.
  • a backlight unit that is a multi-wavelength light source.
  • blue light having an emission center wavelength in a wavelength band of 430 to 480 nm and a peak of emission intensity having a half width of 100 nm or less, and an emission center wavelength in a wavelength band of 500 to 600 nm and having a half width of It is preferable to emit green light having an emission intensity peak that is 100 nm or less and red light having an emission center wavelength in the wavelength band of 600 to 680 nm and having an emission intensity peak that is 100 nm or less.
  • the wavelength band of the blue light emitted from the backlight unit 2 is preferably 430 to 480 nm, and more preferably 440 to 460 nm.
  • the wavelength band of the green light emitted from the backlight unit 2 is preferably 520 to 560 nm, and more preferably 520 to 545 nm.
  • the wavelength band of red light emitted from the backlight unit is preferably 600 to 680 nm, and more preferably 610 to 640 nm.
  • the half-value widths of the emission intensity of blue light, green light, and red light emitted from the backlight unit are all preferably 80 nm or less, more preferably 50 nm or less, and 40 nm or less. More preferably, it is more preferably 30 nm or less. Among these, it is particularly preferable that the half-value width of each emission intensity of blue light is 25 nm or less.
  • the backlight unit 2 includes at least the planar light source 1C together with the wavelength conversion member 1D.
  • the light source 1A include those that emit blue light having an emission center wavelength in the wavelength band of 430 nm to 480 nm, and those that emit ultraviolet light.
  • a light emitting diode, a laser light source, or the like can be used as the light source 1A.
  • the planar light source 1 ⁇ / b> C may be a planar light source including a light source 1 ⁇ / b> A and a light guide plate 1 ⁇ / b> B that guides and emits primary light emitted from the light source 1 ⁇ / b> A.
  • a planar light source that is arranged side by side in a plane parallel to the wavelength conversion member 1D and includes a diffusion plate 1E instead of the light guide plate 1B may be used.
  • the former planar light source is generally called an edge light system, and the latter planar light source is generally called a direct type.
  • the reflecting plate 2A is not particularly limited, and known ones can be used, and are described in Japanese Patent No. 3416302, Japanese Patent No. 3363565, Japanese Patent No. 4091978, Japanese Patent No. 3448626, etc. Incorporated into the present invention.
  • the retroreflective member 2B may include a known diffusion plate, diffusion sheet, prism sheet (for example, BEF series manufactured by Sumitomo 3M Limited), a light guide, or the like.
  • the configuration of the retroreflective member 2B is described in Japanese Patent No. 3416302, Japanese Patent No. 3363565, Japanese Patent No. 4091978, Japanese Patent No. 3448626, and the contents of these publications are incorporated in the present invention.
  • the backlight unit 2 described above can be applied to a liquid crystal display device.
  • the liquid crystal display device 4 includes the backlight unit 2 of the above-described embodiment and the liquid crystal unit 3 disposed to face the retroreflective member side of the backlight unit.
  • the liquid crystal unit 3 has a configuration in which a liquid crystal cell 31 is sandwiched between polarizing plates 32 and 33, and the polarizing plates 32 and 33 respectively polarize both main surfaces of polarizers 322 and 332.
  • the plate protection films 321 and 323, 331, and 333 are used for protection.
  • liquid crystal cell 31 there are no particular limitations on the liquid crystal cell 31, the polarizing plates 32 and 33, and the components thereof that constitute the liquid crystal display device 4, and those produced by known methods and commercially available products can be used without any limitation. It is of course possible to provide a known intermediate layer such as an adhesive layer between the layers.
  • the driving mode of the liquid crystal cell 31 is not particularly limited, and is twisted nematic (TN), super twisted nematic (STN), vertical alignment (VA), in-plane switching (IPS), optically compensated bend cell (OCB). ) And other modes can be used.
  • the liquid crystal cell is preferably VA mode, OCB mode, IPS mode, or TN mode, but is not limited thereto.
  • the configuration shown in FIG. 2 of Japanese Patent Application Laid-Open No. 2008-262161 is given as an example.
  • the specific configuration of the liquid crystal display device is not particularly limited, and a known configuration can be adopted.
  • the liquid crystal display device 4 further includes an associated functional layer such as an optical compensation member that performs optical compensation as necessary, and an adhesive layer.
  • an associated functional layer such as an optical compensation member that performs optical compensation as necessary, and an adhesive layer.
  • an adhesive layer such as an adhesive to an adhesive layer.
  • a surface layer such as an undercoat layer may be disposed.
  • the backlight side polarizing plate 32 may have a retardation film as the polarizing plate protective film 323 on the liquid crystal cell 31 side.
  • a retardation film a known cellulose acylate film or the like can be used.
  • the backlight unit 2 and the liquid crystal display device 4 include the above-described wavelength conversion member with little optical loss according to the present invention. Therefore, the same effects as those of the wavelength conversion member of the present invention can be obtained, and a backlight unit and a liquid crystal display device with high luminance can be obtained.
  • An oxygen barrier layer was formed on one side of a polyethylene terephthalate film (PET film, manufactured by Toyobo Co., Ltd., trade name: Cosmo Shine A4300, thickness 50 ⁇ m) by the following procedure.
  • Cosmo Shine A4300 had a mat layer on both sides.
  • Trimethylolpropane triacrylate (TMPTA, manufactured by Daicel Cytec Co., Ltd.) and a photopolymerization initiator (Lamberti Co., Ltd., trade name: ESACURE KTO46) were prepared and weighed so that the mass ratio was 95: 5. It was dissolved in methyl ethyl ketone to obtain a coating solution having a solid concentration of 15%.
  • This coating solution was applied onto the PET film with a roll toe roll using a die coater, and passed through a drying zone at 50 ° C. for 3 minutes. Thereafter, ultraviolet rays were irradiated in a nitrogen atmosphere (accumulated dose: about 600 mJ / cm 2 ), cured by UV curing, and wound up.
  • the thickness of the first organic layer formed on the support was 1 ⁇ m.
  • an inorganic layer (silicon nitride layer) was formed on the surface of the organic layer using a chemical vapor deposition apparatus (CVD apparatus) of a roll toe roll.
  • Silane gas (flow rate 160 sccm), ammonia gas (flow rate 370 sccm), hydrogen gas (flow rate 590 sccm), and nitrogen gas (flow rate 240 sccm) were used as source gases.
  • a high frequency power supply having a frequency of 13.56 MHz was used as the power supply.
  • the film forming pressure was 40 Pa, and the reached film thickness was 50 nm.
  • oxygen barrier film PET1 in which an inorganic layer was laminated on the surface of the organic layer was produced.
  • oxygen barrier film PET2 An oxygen barrier film PET2 was obtained in the same manner as PET1, except that the base film was changed to another polyethylene terephthalate film (PET film, manufactured by Toyobo Co., Ltd., trade name: Cosmo Shine A4300, thickness 38 ⁇ m).
  • PET film manufactured by Toyobo Co., Ltd., trade name: Cosmo Shine A4300, thickness 38 ⁇ m.
  • An oxygen barrier film COP1 was obtained in the same manner as PET 1 except that the base material was changed to a ZEONOR film (cyclic olefin polymer film, thickness 32 ⁇ m) manufactured by Nippon Zeon Co., Ltd.
  • a screen filter, a gear pump, and a leaf disk filter were arranged in this order between the extruder and the die, and these were connected by a melt pipe and extruded from a die having a width of 450 mm and a lip gap of 1 mm.
  • the unstretched film was stretched 3.8 times in the transverse direction at 115 ° C., and then subjected to heat treatment for 10 seconds while being relaxed 5% in the width direction at 200 ° C. to prepare a stretched film having a thickness of 53 ⁇ m.
  • An oxygen barrier film PS1 was obtained in the same manner as PET 1 except that the stretched film B1 thus obtained was used as a base film.
  • oxygen barrier film PEN1 An oxygen barrier film PEN1 was obtained in the same manner as PS1, except that the resin was changed to polyethylene-2,6-naphthalate (PEN) and the thickness of the stretched film was changed to 40 ⁇ m.
  • PEN polyethylene-2,6-naphthalate
  • oxygen barrier film PC1 was obtained in the same manner as PET 1, except that the base material was changed to a stretched polycarbonate film (trade name: Pure Ace WR, W-159, thickness: 93 ⁇ m) manufactured by Teijin Limited.
  • a stretched polycarbonate film (trade name: Pure Ace WR, W-159, thickness: 93 ⁇ m) manufactured by Teijin Limited.
  • An oxygen barrier film TAC1 was obtained in the same manner as PET 1 except that the base material was changed to TD80UL (triacetyl cellulose film, thickness 80 ⁇ m) manufactured by Fuji Film Co., Ltd.
  • Quantum Dot-Containing Polymerizable Composition Used in Example 1 The following quantum dot-containing polymerizable composition 1 was prepared, filtered through a polypropylene filter having a pore size of 0.2 ⁇ m, dried under reduced pressure for 30 minutes, and used as a coating solution.
  • CZ520-100 manufactured by NN-Labs Co. is used as the quantum dot dispersion liquid 1 having an emission maximum wavelength of 535 nm
  • CZ620-100 manufactured by NN-Labs Co. is used as the quantum dot dispersion liquid 2 having an emission maximum wavelength of 630 nm. It was.
  • a quantum dot-containing polymerizable composition was prepared at a composition ratio (mass ratio) shown in Table 1, filtered through a polypropylene filter having a pore size of 0.2 ⁇ m, dried under reduced pressure for 30 minutes, and used as a coating solution.
  • Example 1 The first PET1 is prepared, and the quantum dot-containing polymerizable composition 1 is applied on the surface of the inorganic layer with a die coater while continuously transporting at a tension of 1 m / min and 60 N / m, and a coating film having a thickness of 50 ⁇ m. Formed. Next, the first PET1 with the coating film formed is wound around a backup roller, and the second PET1 is laminated on the coating film so that the inorganic layer surface is in contact with the coating film. While continuously transporting the coating film, the heating zone at 100 ° C. was passed for 3 minutes.
  • Examples 2 to 6 and Comparative Examples 1 to 4 Except having changed the base film or the barrier layer into the thing of Table 1, it carried out similarly to Example 1, and produced the wavelength conversion member of another Example and a comparative example.

Abstract

Le problème décrit par l'invention est de pourvoir à un élément de conversion de longueur d'onde comportant une couche de conversion de longueur d'onde contenant des points quantiques qui émettent une lumière fluorescente lorsqu'ils sont exposés à une lumière d'excitation ; dans lequel la perte de lumière est réduite. La présente invention concerne une unité de rétroéclairage et un dispositif d'affichage à cristaux liquides à haute luminosité. La solution de l'invention porte sur un élément de conversion de longueur d'onde (1D) comportant une couche de conversion de longueur d'onde (30) contenant des points quantiques (30A, 30B), qui sont excités par une lumière d'excitation (LB) et émettent une lumière fluorescente (LR, LG), la couche de conversion de longueur d'onde (30) étant pourvue d'un film de substrat (11, 21) sur au moins une surface, le film de substrat (11, 21) étant tel que la transmittance de lumière totale est inférieure à 92 % et le taux d'absorption de la lumière ayant une longueur d'onde de 450 nm est inférieur à 0,9 % mesuré à l'aide d'une sphère intégratrice.
PCT/JP2015/004914 2014-09-30 2015-09-29 Élément de conversion de longueur d'onde, unité de rétroéclairage le comportant, et dispositif d'affichage à cristaux liquides WO2016051760A1 (fr)

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US15/465,894 US10408987B2 (en) 2014-09-30 2017-03-22 Wavelength conversion member and backlight unit including same, and liquid crystal display device

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JP2014-200585 2014-09-30
JP2014200585 2014-09-30
JP2015164880A JP6339053B2 (ja) 2014-09-30 2015-08-24 波長変換部材及びそれを備えたバックライトユニット、液晶表示装置
JP2015-164880 2015-08-24

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CN107741613A (zh) * 2017-11-01 2018-02-27 惠州市华星光电技术有限公司 偏光片及液晶显示面板
WO2022039014A1 (fr) * 2020-08-19 2022-02-24 大日本印刷株式会社 Film barrière, et feuille de conversion de longueur d'onde, et rétroéclairage, et dispositif d'affichage à cristaux liquides dans lequel celui-ci est utilisé, ainsi que procédé de sélection de film barrière

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JP2005096108A (ja) * 2003-09-22 2005-04-14 Dainippon Printing Co Ltd 反射防止ガスバリア性基板
JP2006126774A (ja) * 2004-09-30 2006-05-18 Nitto Denko Corp 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置
JP2007290369A (ja) * 2006-03-29 2007-11-08 Fujifilm Corp ガスバリア性積層フィルムとその製造方法、および画像表示素子
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Publication number Priority date Publication date Assignee Title
JP2005096108A (ja) * 2003-09-22 2005-04-14 Dainippon Printing Co Ltd 反射防止ガスバリア性基板
JP2006126774A (ja) * 2004-09-30 2006-05-18 Nitto Denko Corp 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置
JP2007290369A (ja) * 2006-03-29 2007-11-08 Fujifilm Corp ガスバリア性積層フィルムとその製造方法、および画像表示素子
JP2013544018A (ja) * 2010-11-10 2013-12-09 ナノシス・インク． 量子ドットフィルム、照明装置、および照明方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107741613A (zh) * 2017-11-01 2018-02-27 惠州市华星光电技术有限公司 偏光片及液晶显示面板
WO2022039014A1 (fr) * 2020-08-19 2022-02-24 大日本印刷株式会社 Film barrière, et feuille de conversion de longueur d'onde, et rétroéclairage, et dispositif d'affichage à cristaux liquides dans lequel celui-ci est utilisé, ainsi que procédé de sélection de film barrière

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