Quantum dot protective film, quantum dot film using same, and backlight unit

• US 10,571,619 B2
• Filed: 07/16/2015
• Issued: 02/25/2020
• Est. Priority Date: 10/16/2014
• Status: Active Grant

• Current Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Original Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: Kitahara, Tsukasa, Tokinoya, Osamu, Nishikawa, Takeshi
• Primary Examiner(s): Chen, Vivian
• Application Number:
  US15/109,337
• Publication Number:
  US 20160327719A1
• Time in Patent Office: 1,685 Days
• Field of Search: None
• CPC Class Codes: B32B 2250/04 4 layers
• CPC Class Codes: B32B 2250/05 5 or more layers
• CPC Class Codes: B32B 2250/40 Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
• CPC Class Codes: B32B 2250/42 Alternating layers, e.g. ABAB(C), AABBAABB(C)
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2255/20 Inorganic coating
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2255/28 Multiple coating on one surface
• CPC Class Codes: B32B 2264/0214 Particles made of materials belonging to B32B27/00
• CPC Class Codes: B32B 2264/0257 Polyolefin particles, e.g. polyethylene or polypropylene homopolymers or ethylene-propylene copolymers
• CPC Class Codes: B32B 2264/04 Cellulosic particles, e.g. rayon
• CPC Class Codes: B32B 2264/10 Inorganic particles
• CPC Class Codes: B32B 2307/40 having particular optical properties light or UV resistant B32B2307/71
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2307/414 Translucent
• CPC Class Codes: B32B 2307/416 Reflective
• CPC Class Codes: B32B 2307/418 Refractive
• CPC Class Codes: B32B 2307/422 Luminescent, fluorescent, phosphorescent
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 2307/7244 Oxygen barrier
• CPC Class Codes: B32B 2307/7246 : Water vapor barrier
• CPC Class Codes: B32B 2311/00 : Metals, their alloys or their compounds
• CPC Class Codes: B32B 2315/00 : Other materials containing non-metallic inorganic compounds not provided for in groups B32B2311/00 - B32B2313/04
• CPC Class Codes: B32B 2367/00 : Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 2457/20 : Displays, e.g. liquid crystal displays, plasma displays
• CPC Class Codes: B32B 2457/202 : LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 2457/206 : Organic displays, e.g. OLED
• CPC Class Codes: B32B 2571/00 : Protective equipment
• CPC Class Codes: B32B 27/06 : as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 27/08 : of synthetic resin
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 3/00 : Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
• CPC Class Codes: B32B 7/12 : using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B32B 9/04 : comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a glass layer B32B17/06; layered products with at least two ceramic layers composed mainly of ceramic B32B18/00
• CPC Class Codes: B32B 9/045 : of synthetic resin
• CPC Class Codes: B82Y 20/00 : Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: C09K 11/00 : Luminescent, e.g. electroluminescent, chemiluminescent materials
• CPC Class Codes: F21V 9/00 : Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters coloured shades F21V1/00; elements characterised by cooling arrangements F21V29/502
• CPC Class Codes: F21V 9/30 : Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: F21V 9/32 : characterised by the arrangement of the photoluminescent material
• CPC Class Codes: G02B 1/10 : Optical coatings produced by application to, or surface treatment of, optical elements G02B1/08 takes precedence
• CPC Class Codes: G02B 1/14 : Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 5/02 : Diffusing elements; Afocal elements
• CPC Class Codes: G02B 6/00 : Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
• CPC Class Codes: G02B 6/0011 : the light guides being planar or of plate-like form
• CPC Class Codes: G02B 6/005 : provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0051 : Diffusing sheet or layer
• CPC Class Codes: G02F 1/1333 : Constructional arrangements; Manufacturing methodsG02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/1335 : Structural association of cells with optical devices, e.g. polarisers or reflectors
• CPC Class Codes: G02F 1/133504 : Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133524 : Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
• CPC Class Codes: G02F 1/13356 : characterised by the placement of the optical elements
• CPC Class Codes: G02F 1/133562 : on the viewer side
• CPC Class Codes: G02F 1/1336 : Illuminating devices
• CPC Class Codes: G02F 1/133603 : with LEDs
• CPC Class Codes: G02F 1/133606 : including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 : the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/133615 : Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: H01L 33/50 : Wavelength conversion elements
• CPC Class Codes: H01L 33/502 : Wavelength conversion materials

Abstract

A first quantum dot protective film comprises a first barrier film including a silica deposition layer, and a first diffusion layer. An O/Si ratio of the silica deposition layer is 1.7 or more and 2.0 or less on an atomic ratio basis, and a refractive index of the silica deposition layer is 1.5 or more and 1.7 or less; and a reflectance of the first quantum dot protective film is 10% or more and 20% or less at each of wavelengths of 450 nm, 540 nm and 620 nm, and a transmittance of the first quantum dot protective film is 80% or more and 87% or less at each of wavelengths of 450 nm, 540 nm and 620 nm.

Claims

1. A quantum dot film comprising:

a quantum dot layer containing a quantum dot compound as a fluorescent substance; and

a quantum dot protective film including;

a diffusion layer, and

a barrier film including a silica deposition layer, wherein

the barrier film has a structure in which an adhesion layer, the silica deposition layer, and a composite coating layer are laminated in this sequence on at least one surface of a polyester film,

the polyester film has a center line surface roughness (Ra) of 30 nm or less,

a ratio of oxygen to silicon, an O/Si ratio, contained in the silica deposition layer is 1.8 or more and less than 2.0 on an atomic ratio basis,

a refractive index of the silica deposition layer is 1.5 or more and 1.7 or less,

a reflectance of the quantum dot protective film is 10% or more and 20% or less at each of wavelengths of 450 nm, 540 nm and 620 nm,

a transmittance of the quantum dot protective film is 80% or more and 87% or less at each of the wavelengths of 450 nm, 540 nm, and 620 nm,

the composite coating layer is a layer containing at least one selected from a water soluble polymer, a metal alkoxide, a hydrolyzate of a metal alkoxide, and a silane coupling agent, and

the composite coating layer includes hydroxyl group-containing polymer compounds.

2. The quantum dot film according to claim 1, wherein the polyester film is a polyethylene terephthalate film formed of polyethylene terephthalate having a weight average molecular weight of 60000 or more.

3. The quantum dot film according to claim 1, wherein

the barrier film comprises two or more instances of the silica deposition layer and two or more instances of the composite coating layer, and

the two or more instances of the silica deposition layer are alternately laminated with the two or more instances of the composite coating layer.

4. The quantum dot film according to claim 1, wherein the diffusion layer, the barrier film, and quantum dot layer, the barrier film, and the diffusion layer are laminated in this sequence.

5. A backlight unit comprising an LED light source, a light guiding panel, and the quantum dot film according to claim 1 disposed on the light guiding panel.