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WO2024136045A1 - Film optique et dispositif d'affichage d'image le comprenant - Google Patents

Film optique et dispositif d'affichage d'image le comprenant Download PDF

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Publication number
WO2024136045A1
WO2024136045A1 PCT/KR2023/015434 KR2023015434W WO2024136045A1 WO 2024136045 A1 WO2024136045 A1 WO 2024136045A1 KR 2023015434 W KR2023015434 W KR 2023015434W WO 2024136045 A1 WO2024136045 A1 WO 2024136045A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
optical film
acrylate
meth
wavelength
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2023/015434
Other languages
English (en)
Korean (ko)
Inventor
김혜린
김지현
임거산
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongwoo Fine Chem Co Ltd
Original Assignee
Dongwoo Fine Chem Co Ltd
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 Dongwoo Fine Chem Co Ltd filed Critical Dongwoo Fine Chem Co Ltd
Priority to CN202380086709.5A priority Critical patent/CN120380386A/zh
Publication of WO2024136045A1 publication Critical patent/WO2024136045A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/12—Optical coatings produced by application to, or surface treatment of, optical elements by surface treatment, e.g. by irradiation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters

Definitions

  • the present invention relates to an optical film and an image display device including the same.
  • image display devices such as smartphones, tablets, and personal computers display images by transmitting light emitted from a light source.
  • blue light in the wavelength range of 380 to 495 nm is the longest wavelength of visible light that can be seen by the human eye. It is short and has strong energy similar to ultraviolet rays. This strong energy reaches the retina without being absorbed by the cornea or lens, causing damage to the retina, fatigue, and adversely affecting sleep.
  • Blue light which is known to have these problems, is also called blue light, and various efforts are being made to block it.
  • the present invention is intended to improve the problems of the prior art, and aims to provide an optical film that effectively blocks wavelengths harmful to the human body while improving transmittance for non-harmful light without affecting visual characteristics.
  • the present invention aims to provide an image display device including the optical film.
  • the present invention is an optical film comprising a light-transmitting substrate and a light-transmitting functional layer formed on one or both sides of the light-transmitting substrate.
  • the spectral transmittance at a wavelength of 380 nm is less than 1%, and the spectral transmittance at a wavelength of 410 nm is less than 1%.
  • An optical film is provided having a transmittance of less than 10% and a spectral transmittance of less than 15% at a wavelength of 440 nm.
  • the present invention provides an image display device including the optical film.
  • the present invention efficiently shields light in the wavelength range that is particularly harmful to the human body among blue light, but has excellent light transmittance in the wavelength range that is not harmful to the human body so as not to affect visual characteristics, and can be applied to various areas for blue light shielding.
  • An optical film can be provided.
  • the present invention can provide an image display device that is effective in blocking blue light and has excellent visual characteristics.
  • the present invention is an optical film comprising a light-transmitting substrate and a light-transmitting functional layer formed on one or both sides of the light-transmitting substrate, and has a spectral transmittance of less than 1% at a wavelength of 380 nm and a spectral transmittance of less than 10% at a wavelength of 410 nm, An optical film having a spectral transmittance of less than 15% at a wavelength of 440 nm is provided.
  • the present invention provides an image display device including the optical film.
  • the present invention relates to an optical film comprising a light-transmitting substrate and a light-transmitting functional layer formed on one or both sides of the light-transmitting substrate.
  • the present invention blocks light of 455 nm or less, which is a wavelength range harmful to the human body, among the blue light wavelength ranges, while sufficiently transmitting light of 480 nm or more, which is a wavelength range that is not harmful to the human body, as long as it does not affect visual characteristics. This is about an optical film that can prevent harmful blue light.
  • the wavelength range around 450nm was not known to be harmful to the human body, so we focused on blocking the wavelength range below 410nm.
  • the present inventors have discovered that the wavelength range below 455nm is also a harmful blue light range to the human body. confirmed. Accordingly, the present invention was completed after confirming that an optical film can be provided that effectively blocks light in the wavelength range of 455 nm or less and has excellent light transmittance of 480 nm or more without affecting visual characteristics.
  • the present invention is an optical film comprising a light-transmitting substrate and a light-transmitting functional layer formed on one or both sides of the light-transmitting substrate, and has a spectral transmittance of less than 1% at a wavelength of 380 nm and a spectral transmittance of 10% at a wavelength of 410 nm. % and a spectral transmittance at a wavelength of 440 nm is less than 15%.
  • the present invention can provide an optical film with excellent shielding properties against blue light areas harmful to the human body by satisfying the spectral transmittance for the above wavelength range.
  • the present invention can provide an optical film with a spectral transmittance of 70% or more at a wavelength of 480 nm, preventing harm to the human body by appropriately blocking the blue light area harmful to the human body, and displaying the light when applied to an image display device. It is possible to provide an optical film that does not affect the color of the screen.
  • the optical film of the present invention that satisfies the above transmittance may have a blue light ratio (BLR) of 21% or less, preferably 20% or less, as expressed by Equation 1 below.
  • BLR blue light ratio
  • Equation 1 If the blue light ratio expressed by Equation 1 above exceeds 21%, it is not desirable because it means that light in the blue light area harmful to the human body is transmitted without being blocked.
  • the optical film of the present invention may have a spectral transmittance of 70% or more at 480 nm so as to block blue light harmful to the human body while not affecting the transmission of a blue light source.
  • Light in the wavelength range of 455 nm or less, which is a blue light source in the wavelength range harmful to the human body, is not transmitted smoothly and is blocked, while the transmittance of the blue light wavelength range of 480 nm or more, which does not affect the human body, is excellent, showing that the blue light source is being expressed well. You can.
  • the light-transmitting substrate of the present invention may be a film excellent in transparency, mechanical strength, thermal stability, moisture shielding, isotropy, etc.
  • Specific examples include polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; Cellulose-based resins such as diacetylcellulose and triacetylcellulose; polycarbonate-based resin; Cellulose-based resins such as polymethyl (meth)acrylate and polyethyl (meth)acrylate; Styrene-based resins such as polystyrene and acrylonitrile-styrene copolymer; Polyolefin-based resins such as polyethylene, polypropylene, polyolefins with cyclo- or norbornene structures, and ethylene-propylene copolymers; Vinyl chloride-based resin; Allylate resin; polyoxymethylene-based resin; A film composed of a thermoplastic resin such as
  • the light-transmitting substrate may have a thickness of 50 ⁇ m to 150 ⁇ m. If the thickness of the light-transmitting substrate is less than 50 ⁇ m, problems such as not properly supporting the light-transmitting functional layer may occur, and if the thickness is more than 150 ⁇ m, the thickness of the entire film increases due to excessive thickness, resulting in optical Problems such as decreased transmittance or flexibility of the film may occur.
  • the light-transmitting functional layer of the present invention is a layer that has a function that can satisfy the above-described spectral transmittance, blue light ratio, and yellowness, and is, for example, a light-transmitting functional layer containing a photocurable compound, a photoinitiator, and an absorber described later. It can be formed using a forming composition.
  • the light-transmitting functional layer of the present invention preferably has a spectral transmittance of less than 1% at a wavelength of 380 nm, a spectral transmittance of less than 10% at a wavelength of 410 nm, and a spectral transmittance of less than 15% at a wavelength of 440 nm.
  • the light-transmitting functional layer of the present invention has a spectral transmittance of 70% or more at a wavelength of 480 nm.
  • the light-transmitting functional layer of the present invention preferably has a blue light ratio (BLR) of 21% or less, and more preferably 20% or less, as expressed by Equation 1 below.
  • BLR blue light ratio
  • the light-transmitting functional layer of the present invention may have a spectral transmittance of 70% or more at 480 nm so as to block blue light harmful to the human body while not affecting the transmission of a blue light source. From this, it can be seen that the transmittance of the blue light wavelength range of 480 nm or more, which does not affect the human body, is excellent, and the blue light source is well expressed.
  • the light-transmitting functional layer may have a thickness of 10 ⁇ m or less.
  • the thickness of the light-transmitting functional layer is 10 ⁇ m or less, it is preferable because the desired spectral transmittance for each wavelength can be appropriately satisfied.
  • the light-transmitting functional layer of the present invention can be formed using a composition for forming a light-transmitting functional layer containing a photocurable compound, a photoinitiator, and an absorbent. Accordingly, the above-described spectral transmittance, blue light ratio, and yellowness targeted by the present invention can be satisfied.
  • the photocurable compound may include a photocurable (meth)acrylate oligomer and monomer.
  • Urethane (meth)acrylate can be produced from a polyfunctional (meth)acrylate having a hydroxy group in the molecule and a compound having an isocyanate group in the presence of a catalyst.
  • Specific examples of (meth)acrylate having a hydroxy group in the molecule include 2-hydroxyethyl (meth)acrylate, 2-hydroxyisopropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and capro.
  • One or more types may be selected from the group consisting of lactone ring-opened hydroxyacrylate, pentaerythritol tri/tetra(meth)acrylate mixture, and dipentaerythritol penta/hexa(meth)acrylate mixture.
  • compounds having the isocyanate group include 1,4-diisocyanatobutane, 1,6-diisocyanatohexane, 1,8-diisocyanatooctane, 1,12-diisocyanatododecane, 1, 5-diisocyanato-2-methylpentane, trimethyl-1,6-diisocyanatohexane, 1,3-bis(isocyanatomethyl)cyclohexane, trans-1,4-cyclohexene diisocyanate, 4,4 '-methylenebis(cyclohexylisocyanate), isophorone diisocyanate, toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, xylene-1,4-diisocyanate, tetramethylxylene-1, 3-diisocyanate, 1-chloromethyl-2,4-diiso
  • the monomer is commonly used and has an unsaturated group such as (meth)acryloyl group, vinyl group, styryl group, and allyl group in the molecule as a photocurable functional group, and among them, (meth)acryloyl group is more preferable.
  • the monomer having the (meth)acryloyl group include neopentyl glycol acrylate, 1,6-hexanediol (meth)acrylate, propylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, Dipropylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolethane tri(meth)acrylate, 1 ,2,4-cyclohexane tetra(meth)acrylate, pentaglycerol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate , dipentaerythritol penta(meth)acrylate, dipentaery
  • photocurable (meth)acrylate oligomers and monomers exemplified above can be used individually or in combination of two or more.
  • the content of the photocurable compound is not particularly limited, but may include 1 to 80% by weight, preferably 1 to 50% by weight, based on the total weight of the composition for forming the light-transmitting functional layer. If it is less than 1% by weight, it is difficult to achieve sufficient hardness improvement, and if it exceeds 80% by weight, there is a risk of curling becoming severe.
  • the photoinitiator can be used without limitation as long as it is used in the relevant technical field.
  • one or more types selected from the group consisting of hydroxyketones, aminoketones, hydrogen recovery type photoinitiators, and combinations thereof may be used.
  • the photoinitiator includes 2-methyl-1-[4-(methylthio)phenyl]2-morpholinepropanone-1, diphenyl ketone, benzyldimethyl ketal, 2-hydroxy-2-methyl-1- Phenyl-1-one, 4-hydroxycyclophenylketone, 2,2-dimethoxy-2-phenyl-acetophenone, anthraquinone, fluorene, triphenylamine, carbazole, 3-methylacetophenone, 4-c.
  • This photoinitiator is used in an amount of 0.1 to 10% by weight, preferably 1 to 5% by weight, based on the total weight of the composition for the light-transmitting functional layer. If the content is less than the above range, the curing speed of the composition is slow and non-curing occurs, resulting in poor mechanical properties. Conversely, if the content exceeds the above range, cracks may occur in the coating film due to overcuring.
  • the composition for forming a light-transmitting functional layer included in an optical film according to an embodiment of the present invention may include an absorber, and includes a first absorber having a maximum absorption wavelength at 400 nm and a second absorbent having a maximum absorption wavelength at 420 nm. Contains an absorbent at the same time. That is, the above-mentioned spectral transmittance, blue light ratio, and yellowness can be satisfied by including a first absorber and a second absorber having maximum absorption wavelengths of different wavelengths.
  • Eporite 5663 and Eporite 5845 from Epolline, FND-009 from Yada Chemical, ANTHRACURE UVS-1331 from AWPC, ANTHRACURE UVS-1101, ANTHRACURE UVS-581, ANTHRACURE UVS-2171 from Hayashibara.
  • Epolin's Eporite 5820 Eporite 5851, Eporite 5636, BASF's Tinuvin 970, Toyo Ink's NUV-910, Luxottica's ABS-415, ABS-420, ABS-425, and ABS. -426, Yamada Chemical's FDB-001, Hayashibara's NK-10396, DYE2, etc.
  • the absorbent is included in an amount of 0.1 to 10% by weight, preferably 0.5 to 5% by weight, based on the total weight of the composition for forming the light-transmitting functional layer. If the content is less than the above range, the absorption rate is insufficient, and if it exceeds the above range, liquid compatibility is reduced.
  • the composition for a light-transmitting functional layer included in the optical film according to an embodiment of the present invention may include a solvent.
  • the solvent of the present invention can be used without limitation as long as it is capable of dissolving or dispersing the above-mentioned composition and is known as a solvent for the composition for forming a coating layer in the present technical field.
  • Solvents that can be used are alcohol-based (methanol, ethanol, isopropanol, butanol, methylcellusov, ethylsolusov, etc.), ketone-based (methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, Cyclohexanone, etc.), acetate series (ethyl acetate, propyl acetate, n-butyl acetate, tertiary-butyl acetate, methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, Propylene glycol monopropyl ether acetate, methoxybutyl acetate, methoxypentyl acetate, etc.), hexane type (he
  • the solvent is preferably contained in an amount of 10 to 95% by weight based on 100 weight of the total composition for forming the light-transmitting functional layer. If the content of the solvent is less than the above content, the viscosity is high and workability is reduced. Conversely, if it exceeds the above range, the drying process takes a lot of time and is not economical, and haze may occur.
  • composition for a light-transmitting functional layer included in the optical film according to an embodiment of the present invention may further include an additive, and the type of the additive may be determined according to the user's needs and is not particularly limited in the present invention. , for example, may further include additives such as leveling agents, ultraviolet stabilizers, and heat stabilizers.
  • the leveling agent is a component that provides smoothness and coating properties to the coating film.
  • leveling agents include silicone-based leveling agents, fluorine-based leveling agents, and acrylic polymer-based leveling agents. These can be used alone or in combination of two or more types.
  • the leveling agent may be included in an amount of 0.1 to 1% by weight based on the total weight of the composition for the light-transmitting functional layer, but is not limited thereto.
  • the present invention provides an image display device including the above-described optical film. Since the present invention effectively blocks only blue light that is harmful to the human body without reducing the spectral transmittance of non-harmful wavelengths, it is possible to provide an image display device with excellent blue light shielding ability without affecting the color of the image display screen.
  • composition for the light-transmitting functional layer of Preparation Examples 1 to 4 was coated on a triacetylcellulose (TAC) substrate so that the thickness after curing was as shown in Table 1 below, the solvent was dried, and the UV accumulated light amount of 500 mJ/cm2 was applied. A film was prepared.
  • TAC triacetylcellulose
  • the transmittance of the optical films prepared in the above examples and comparative examples at 380nm, 410nm, 440nm, 480nm, and 500nm wavelengths was measured using UV-2600 equipment (Shimadzu Corporation), and the results are listed in Table 1 below.
  • the transmittance of the optical films prepared in the above examples and comparative examples was measured using UV-2600 (Shimadzu Corporation) equipment, and then the BLR value was calculated according to Equation 1 below.
  • the optical film that satisfies the spectral transmittance at wavelengths of 380nm, 410nm, and 440nm according to the embodiment of the present invention has a BLR value of 21% or less, and therefore has blue light shielding performance. You can tell it's excellent.
  • the optical film of the embodiment of the present invention has a spectral transmittance of 70% or more at wavelengths of 480 nm and 500 nm, and therefore there is no problem in transmitting the blue light source.
  • the present invention efficiently shields light in the wavelength range that is particularly harmful to the human body among blue light, but has excellent light transmittance in the wavelength range that is not harmful to the human body so as not to affect visual characteristics, and can be applied to various areas for blue light shielding.
  • An optical film can be provided.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Filters (AREA)

Abstract

La présente invention peut fournir un film optique et un dispositif d'affichage d'image, le film optique comprenant un substrat transmissif et une couche fonctionnelle transmettant la lumière formée sur une surface ou les deux surfaces du substrat transmissif, la transmittance spectrale du film optique à une longueur d'onde de 380 nm étant inférieure à 1%, la transmittance spectrale à une longueur d'onde de 410 nm étant inférieure à 10%, et la transmittance spectrale à une longueur d'onde de 440 nm étant inférieure à 15%. Le film optique bloque efficacement la lumière dans une plage de longueurs d'onde particulièrement nocive pour le corps humain, et présente en même temps une excellente transmittance de lumière dans une plage de longueurs d'onde non nocive pour le corps humain de façon à ne pas affecter les caractéristiques visuelles.
PCT/KR2023/015434 2022-12-21 2023-10-06 Film optique et dispositif d'affichage d'image le comprenant Ceased WO2024136045A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202380086709.5A CN120380386A (zh) 2022-12-21 2023-10-06 光学膜和包含其的图像显示装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2022-0180402 2022-12-21
KR1020220180402A KR20240098547A (ko) 2022-12-21 2022-12-21 광학 필름 및 이를 포함하는 화상 표시 장치

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WO2024136045A1 true WO2024136045A1 (fr) 2024-06-27

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PCT/KR2023/015434 Ceased WO2024136045A1 (fr) 2022-12-21 2023-10-06 Film optique et dispositif d'affichage d'image le comprenant

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KR (1) KR20240098547A (fr)
CN (1) CN120380386A (fr)
WO (1) WO2024136045A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004504481A (ja) * 2000-07-24 2004-02-12 コーネリウス、レスター、イー． 紫外線フィルター被覆
JP2014164111A (ja) * 2013-02-25 2014-09-08 Nippon Zeon Co Ltd 機能性フィルム
KR20150085094A (ko) * 2013-02-27 2015-07-22 미쓰이 가가쿠 가부시키가이샤 광학 재료, 광학 재료용 조성물 및 그 용도
KR20190109519A (ko) * 2017-01-31 2019-09-25 다이니폰 인사츠 가부시키가이샤 광학 필름, 편광판, 및 화상 표시 장치

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4819460B2 (ja) 2005-09-28 2011-11-24 山本光学株式会社 光学物品

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004504481A (ja) * 2000-07-24 2004-02-12 コーネリウス、レスター、イー． 紫外線フィルター被覆
JP2014164111A (ja) * 2013-02-25 2014-09-08 Nippon Zeon Co Ltd 機能性フィルム
KR20150085094A (ko) * 2013-02-27 2015-07-22 미쓰이 가가쿠 가부시키가이샤 광학 재료, 광학 재료용 조성물 및 그 용도
KR20190109519A (ko) * 2017-01-31 2019-09-25 다이니폰 인사츠 가부시키가이샤 광학 필름, 편광판, 및 화상 표시 장치

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CN120380386A (zh) 2025-07-25
KR20240098547A (ko) 2024-06-28

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