WO2017154977A1 - 有機ｅｌ表示装置 - Google Patents

有機ｅｌ表示装置 Download PDF

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Publication number
WO2017154977A1
WO2017154977A1 PCT/JP2017/009218 JP2017009218W WO2017154977A1 WO 2017154977 A1 WO2017154977 A1 WO 2017154977A1 JP 2017009218 W JP2017009218 W JP 2017009218W WO 2017154977 A1 WO2017154977 A1 WO 2017154977A1
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WIPO (PCT)
Prior art keywords
organic
film
display device
light
optical
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PCT/JP2017/009218
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English (en)
French (fr)
Japanese (ja)
Inventor
小池　康博
征一 磯嶋
剛志 黒田
孝則 濱田
Original Assignee
大日本印刷株式会社
小池　康博
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Application filed by 大日本印刷株式会社, 小池　康博 filed Critical 大日本印刷株式会社
Priority to KR1020187025244A priority Critical patent/KR102259915B1/ko
Publication of WO2017154977A1 publication Critical patent/WO2017154977A1/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Definitions

  • the present invention relates to an organic EL display device.
  • Organic EL display devices have been increasingly used mainly in portable information terminals and the like because they consume less power than liquid crystal display devices.
  • the organic EL display device has a basic configuration having a surface plate on an organic EL element including a light emitting layer and a substrate, and glass is mainly used as the surface plate.
  • the organic EL display device has a problem that phosphors and the like contained in the light emitting layer of the organic EL element are easily deteriorated by ultraviolet rays.
  • an organic EL display device having an organic EL element that does not have a color filter on the light emitting layer an organic EL display device in which a transparent substrate of the organic EL element is made plastic for flexibility, a color filter, Since the short wavelength cannot be absorbed by the glass transparent substrate, there is a concern about deterioration due to ultraviolet rays such as a phosphor or a phosphor constituting the organic EL element.
  • Patent Document 1 proposes an organic EL element in which an ultraviolet absorption layer is formed between the light emitting layer and the substrate.
  • Patent Literature 1 With the means of Patent Literature 1, it is possible to suppress the deterioration of the organic EL element due to ultraviolet rays. However, the means of Patent Document 1 has a problem that the manufacturing process of the organic EL element is complicated.
  • various optical films may be disposed on the light emission surface of the organic EL element.
  • an optical film based on a polyester film such as a polyethylene naphthalate film may be used.
  • the polyethylene naphthalate film can impart a high retardation value even with a thin film, and therefore can suppress interference unevenness due to the retardation value while reducing the thickness of the entire organic EL display device.
  • the polyethylene naphthalate film is excellent in ultraviolet absorption, it is possible to suppress deterioration of the organic EL element due to ultraviolet rays without forming an ultraviolet absorption layer in the display element as in Patent Document 1.
  • the screen may feel pale when used outdoors, and the color may be impaired.
  • the organic EL display device is often used as a portable information terminal and frequently used outdoors, the color when used outdoors is a serious problem.
  • the present inventors have intensively studied to solve the above problems. As a result, it has been found that the polyethylene naphthalate film absorbs light in the ultraviolet wavelength region and fluoresces light in the short wavelength region of visible light. And it came to solve the said subject by forming the resin layer containing an ultraviolet absorber dare to a polyethylene naphthalate film excellent in ultraviolet-ray absorption performance.
  • the present invention provides the following organic EL display device.
  • An organic EL display device having an optical film A1 on a light emitting surface of an organic EL element, wherein the optical film A1 is a polyester film and the polyester film is opposite to the organic EL element.
  • An organic EL display device comprising: a resin layer a1 containing an ultraviolet absorber formed on a surface, wherein the optical film A1 satisfies the following condition 1.
  • a black light having a central wavelength of 365 nm is arranged on the outermost surface of the optical film A1 on the resin layer a1 side so that the light emitting surface of the black light and the optical film A1 are parallel to each other.
  • a spectral radiance meter is arranged at a position facing the black light across the optical film A1.
  • the black light is emitted, and the spectral radiance x1 of light in the normal direction of the surface opposite to the surface irradiated with the black light of the optical film A1 is set to a wavelength of 400 to 470 nm by the spectral radiance meter. Measure every 1 nm in the region.
  • the spectral radiance meter measures the spectral radiance y1 of light in the normal direction of the black light itself in a wavelength range of 400 to 470 nm every 1 nm.
  • An organic EL display device having an optical laminate A2 on the light emission surface of the organic EL element, wherein the optical laminate A2 is opposite to the polyester film and the organic EL element of the polyester film.
  • An organic EL display device comprising: a resin layer a2 containing an ultraviolet absorber disposed on the side; and the optical laminate A2 does not include a polarizer, and the optical laminate A2 satisfies the following condition 2.
  • a black light having a center wavelength of 365 nm is arranged on the outermost surface on the resin layer a2 side of the polyester film of the optical laminate A2 so that the light emitting surface of the black light and the optical film are parallel to each other.
  • a spectral radiance meter is disposed at a position facing the black light with the optical layered body A2 interposed therebetween.
  • the black light is emitted, and a spectral radiance x2 of light in a normal direction of a surface opposite to the surface irradiated with the black light of the optical layered body A2 by the spectral radiance meter has a wavelength of 400 to 470 nm.
  • the measurement is performed every 1 nm in the region.
  • the spectral radiance meter 2 measures the spectral radiance y2 of light in the normal direction of the black light itself in a wavelength range of 400 to 470 nm every 1 nm.
  • the organic EL display device of the present invention can prevent the color from being generated when used outdoors while suppressing deterioration of the organic EL display device due to ultraviolet rays.
  • Wavelength distribution of spectral radiance of light in the normal direction of black light and wavelength distribution of spectral radiance of light in the normal direction of the surface opposite to the irradiated surface when the PEN film is irradiated with black light It is an example to show.
  • Wavelength distribution of spectral radiance of light in the normal direction of black light and wavelength distribution of spectral radiance of light in the normal direction of the surface opposite to the irradiated surface when irradiating the PET film with black light It is an example to show.
  • the wavelength distribution of the spectral radiance of light in the normal direction of the black light, and the light in the normal direction on the surface opposite to the irradiation surface when the surface of the optical film A1 on the resin layer a1 side is irradiated with black light It is an example which shows wavelength distribution of spectral radiance of.
  • the polyethylene naphthalate film may be referred to as “PEN film” and the polyethylene terephthalate film may be referred to as “PET film”.
  • the first embodiment of the organic EL display device of the present invention is an organic EL display device having an optical film A1 on a light emitting surface of an organic EL element, and the optical film A1 includes a polyester film and the polyester. It has a resin layer a1 containing an ultraviolet absorber formed on the surface of the system film opposite to the organic EL element, and the optical film A1 satisfies the following condition 1.
  • a black light having a central wavelength of 365 nm is arranged on the outermost surface of the optical film A1 on the resin layer a1 side so that the light emitting surface of the black light and the optical film A1 are parallel to each other.
  • a spectral radiance meter is arranged at a position facing the black light across the optical film A1.
  • the black light is emitted, and the spectral radiance x1 of light in the normal direction of the surface opposite to the surface irradiated with the black light of the optical film A1 is set to a wavelength of 400 to 470 nm by the spectral radiance meter. Measure every 1 nm in the region.
  • the spectral radiance meter measures the spectral radiance y1 of light in the normal direction of the black light itself in a wavelength range of 400 to 470 nm every 1 nm.
  • FIGS. 1 to 3 are sectional views showing an example of the first embodiment of the organic EL display device of the present invention.
  • the organic EL display device (100) of FIGS. 1 to 3 has an optical film A1 (20) on the light emitting surface of the organic EL element (10), and the optical film A1 is a polyester film (21).
  • the resin layer a1 (22) containing the ultraviolet absorber is provided on the surface opposite to the organic EL element.
  • the surface plate (30) is disposed on the optical film A1 (20), and the organic EL display device (100) of FIGS. 20) is arranged as a surface plate (30).
  • 1 to 3 has a polarizer (50) as another optical film (40) between the organic EL element (10) and the optical film A1 (20). is doing.
  • 3 is an organic EL display device (100A) with a touch panel having a touch panel (70).
  • the organic EL element (10) of the organic EL display device (100) shown in FIGS. 1 to 3 includes a metal electrode (14), a light emitting layer (13), a transparent electrode (12), and a transparent substrate (11). ing. Further, the light emitting layer (13) of FIGS. 1 to 3 has a red light emitting layer (13a), a green light emitting layer (13b), and a blue light emitting layer (13c).
  • the organic EL element (10) of the organic EL display device (100) of FIGS. 1 to 3 shows an embodiment of the three-color independent type organic EL element.
  • the organic EL display device (100) of FIGS. 1 to 3 shows a state in which an air layer is interposed between the members simply by overlapping the members.
  • the distance between each member is exaggerated to make it easy to understand that an air layer is interposed.
  • each member constituting the organic EL display device (100) may be integrated through an adhesive layer.
  • Condition 1 indicates that fluorescence emission is prevented from being generated from the polyester film constituting the optical film A1 when irradiated with ultraviolet (black light). If the condition 1 is not satisfied, the screen feels pale when used outdoors.
  • the solid line in FIGS. 7 and 8 is an example of the wavelength distribution of the spectral radiance of the light in the normal direction of the black light having the center wavelength of 365 nm.
  • the one-dot chain line in FIG. 7 is an example of the wavelength distribution of the spectral radiance of the light in the normal direction on the surface opposite to the black light irradiated surface of the PEN film when the black light is irradiated onto the PEN film.
  • polyester films such as PEN films and PET films emit fluorescent light in the short wavelength region of visible light when irradiated with ultraviolet rays.
  • the peak value of the fluorescence emission of a PEN film is about 20 times the peak value of the fluorescence emission of a PET film.
  • “E-05” on the vertical axis indicates 10 to the fifth power
  • “E-04” indicates ten to the fourth power
  • “E-03” indicates ten to the third power. Yes.
  • the solid line in FIG. 9 is an example of the wavelength distribution of the spectral radiance of light in the normal direction of the black light having the center wavelength of 365 nm.
  • the broken line in FIG. 9 indicates the black of the optical film A1 when the outermost surface on the resin layer a1 side of the optical film A1 having the resin layer a1 containing the ultraviolet absorber on the PEN film is irradiated with the black light. It is an example of wavelength distribution of the spectral radiance of the light of the normal direction of the surface on the opposite side to a light irradiation surface.
  • satisfying Condition 1 prevents the occurrence of fluorescent light emission in the short wavelength region of visible light from the polyester film constituting the optical film A1 when the optical film A1 receives ultraviolet rays. Show. That is, satisfying Condition 1 can prevent the screen from being felt pale when the organic EL display device is used outdoors.
  • the spectral radiance x1 is substantially equal to the spectral radiance of the light in the normal direction of the surface on the viewer side of the optical film A1. I can say that. The same can be said for the condition 2 of the second embodiment described later.
  • condition 1 “400 to 470 nm” indicates the emission of light in the spectral distribution of the spectral radiance of light in the normal direction of the PEN film when the PEN film of FIG. peak value shows the approximately 9.2 ⁇ 10 -4 (W / sr / m 2 / nm)] 1/2 value [approximately 4.6 ⁇ 10 -4 (W / sr / m 2 / nm)] of the This is based on the upper and lower limits of the wavelength. That is, 400 to 470 nm indicates a wavelength range where the fluorescent light emission of the PEN film is strong. The same can be said for the condition 2 of the second embodiment described later.
  • condition 1 it is preferable to satisfy the relationship of T 1 / L 1 ⁇ 0.70, more preferably satisfy the relationship of T 1 / L 1 ⁇ 0.50, and a relationship of T 1 / L 1 ⁇ 0.45. It is further preferable to satisfy
  • condition 1 it is preferable to irradiate the black light using a black light having an ultraviolet ray illuminance of 6000 ⁇ W / cm 2 at an irradiation distance of 40 cm and a distance between the black light and the optical film A1 of 40 cm.
  • the ultraviolet illuminance is a value obtained by measuring the illuminance in the wavelength region of UV-A (wavelength 315 to 400 nm) every 1 nm and integrating the illuminance at each wavelength of wavelengths 315 to 400 nm.
  • the ultraviolet illuminance of sunlight is about 6000 ⁇ W / cm 2 .
  • a black light having an ultraviolet illuminance of 6000 ⁇ W / cm 2 at an irradiation distance of 40 cm and a distance between the black light and the optical film A1 of 40 cm (hereinafter referred to as “outdoor ultraviolet light condition”) is used. Therefore, it is possible to make the measurement conditions consistent with the outdoor environment. That is, it is preferable that the condition 1 is satisfied in the outdoor ultraviolet light conditions. The same can be said for the condition 2 of the second embodiment described later.
  • the distance between the black light and the optical film A1 is 1 cm using a black light having an ultraviolet illuminance of 6000 ⁇ W / cm 2 or more at an irradiation distance of 40 cm.
  • the black light used in condition 1 has the above L 1 (cumulative value of spectral radiance y1 of light in the normal direction of the black light of each wavelength of 400 to 470 nm) of 0.0020 W / sr / m 2 / nm or less. It is preferable that it is 0.0015 W / sr / m 2 / nm or less.
  • a general-purpose spectral radiance meter can be used.
  • the spectral radiance of light in the normal direction is measured at a measurement angle of 0.2 degrees.
  • the optical film A1 has a polyester film and a resin layer a1 containing an ultraviolet absorber formed on the surface of the polyester film opposite to the organic EL element, and satisfies the above condition 1. Is.
  • polyester film constituting the optical film A1 examples include a polyethylene terephthalate film (PET film), a polyethylene naphthalate film (PEN film), and a polybutylene terephthalate film (PBT film). These polyester films are preferably stretched polyester films from the viewpoint of increasing the mechanical strength and increasing the retardation value. Examples of stretching include longitudinal uniaxial stretching, tenter stretching, sequential biaxial stretching, and simultaneous biaxial stretching. Of the polyester films, a PEN film is preferable.
  • the PEN film is excellent in that it can obtain a high retardation value as a thin film and can suppress interference unevenness due to the retardation value while reducing the thickness of the entire organic EL display device. Further, the PEN film is excellent in ultraviolet absorption. Note that “interference unevenness” refers to rainbow-shaped unevenness that is visually recognized when a screen is observed while wearing polarized sunglasses.
  • the polyester film preferably has a retardation value of 3,000 to 30,000 nm, more preferably 5,000 to 20,000 nm, and more preferably 6,000 to 6,000 nm from the viewpoint of balance between prevention of uneven interference and thinning.
  • a film having a thickness of 15,000 nm is more preferable, and a film having a wavelength of 8,000 to 14,000 nm is more preferable.
  • the retardation value here is a retardation value in wavelength 550nm.
  • Retardation of polyester film a direction perpendicular to the refractive indices n x of the slow axis direction refractive index is largest and the direction in the plane of the polyester film, and the slow axis direction in the plane of the polyester film refractive index and n y of the fast axis is, by the thickness d of the polyester film, those represented by the following formula.
  • Retardation value (Re) (n x ⁇ n y ) ⁇ d
  • the retardation value can be measured by, for example, trade names “KOBRA-WR” and “PAM-UHR100” manufactured by Oji Scientific Instruments.
  • the retardation value can also be calculated by the following steps. (1) Using two or more polarizers, after obtaining the orientation axis direction (major axis direction) of the polyester film, the refractive index of two axes (the refractive index of the orientation axis and the axis perpendicular to the orientation axis) (N x , n y ) is obtained by an Abbe refractometer (NAR-4T manufactured by Atago Co., Ltd.). Here, an axis showing a larger refractive index is defined as a slow axis. (2) The thickness d of the optical film is measured with a micrometer (trade name: Digimatic Micrometer, manufactured by Mitutoyo Corporation) and the unit is converted to nm. (3) a birefringence and (n x -n y), from the product of the thickness of the film d (nm), to calculate the retardation.
  • a micrometer trade name: Digimatic Micrometer, manufactured by Mitutoyo Corporation
  • the thickness of the polyester film is preferably from 5 to 300 ⁇ m, more preferably from 10 to 200 ⁇ m, and even more preferably from 15 to 100 ⁇ m from the viewpoints of handleability and thinning.
  • the resin layer a1 is a layer containing an ultraviolet absorber, and is formed on the surface of the polyester film opposite to the organic EL element.
  • the polyester film is a PEN film
  • the PEN film is excellent in ultraviolet absorption. Therefore, even if a layer containing an ultraviolet absorber is not formed on the PEN film, the phosphor or phosphor constituting the organic EL element. Can be prevented from being deteriorated by ultraviolet rays.
  • the polyester film is a PEN film excellent in ultraviolet absorption, it is possible to prevent the occurrence of fluorescence emission from the PEN film by forming an ultraviolet absorption layer. It is said.
  • the resin layer a1 preferably contains an ultraviolet absorber and a binder resin.
  • the UV absorber include benzotriazole UV absorbers, benzophenone UV absorbers, and triazine UV absorbers.
  • the ultraviolet absorber preferably has an absorption peak in the region of UV-A (wavelength 315 to 400 nm), more preferably has an absorption peak in the region of wavelength 350 to 390 nm, and has an absorption peak in the region of wavelength 360 to 380 nm. More preferred are those having
  • Examples of ultraviolet absorbers having an absorption peak in the wavelength region of 350 to 390 nm include sesamol type benzotriazole type ultraviolet absorbers and resorcinol type benzotriazole type ultraviolet absorbers.
  • Examples of the ultraviolet absorber having an absorption peak in the wavelength region of 360 to 380 nm include sesamol type benzotriazole-based ultraviolet absorbers.
  • Examples of the sesamol-type benzotriazole-based ultraviolet absorber include a polymer of a composition containing a compound (sesamol-type benzotriazole-based monomer) in which sesamol is bonded to the nitrogen atom at the 2-position of the benzotriazole ring.
  • Examples of the sesamol type benzotriazole-based monomer include compounds represented by the following general formula (I). [In formula (I), R 1 represents a hydrogen atom or a methyl group. R 2 represents a linear or branched alkylene group having 1 to 6 carbon atoms or a linear or branched oxyalkylene group having 1 to 6 carbon atoms. ]]
  • Examples of the resorcinol-type benzotriazole-based ultraviolet absorber include a polymer of a composition containing a compound (resorcinol-type benzotriazole-based monomer) in which resorcinol is bonded to the nitrogen atom at the 2-position of the benzotriazole ring.
  • Examples of the resorcinol-type benzotriazole-based monomer include compounds represented by the following general formula (II). [In the formula (II), R 3 represents a hydrogen atom or a methyl group.
  • R 4 represents a linear or branched alkylene group having 1 to 6 carbon atoms.
  • R 5 represents a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms. ]]
  • the composition containing the sesamol type benzotriazole monomer and the composition containing the resorcinol type benzotriazole monomer may contain other monomers.
  • Other monomers include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) (Meth) acrylic acid alkyl esters such as acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate; hydroxyethyl (meth) acrylate Hydroxyl group-containing unsaturated monomers such as hydroxypropylethyl (meth) acrylate,
  • Polymerization methods for copolymerizing a composition containing a resorcinol-type benzotriazole-based monomer or a composition containing a sesamol-type benzotriazole-based monomer are conventionally known solution polymerization methods, emulsion polymerization methods, suspension weights.
  • a combination method, a bulk polymerization method, and the like can be employed, and are not particularly limited.
  • the content of the ultraviolet absorber is 10 to 95% by mass of the total solid content of the resin layer a1 from the viewpoint of easily satisfying the condition 1 and the suppression of bleeding of the ultraviolet absorber from the resin layer a1. It is preferably 30 to 93% by mass, more preferably 60 to 90% by mass, and even more preferably 70 to 85% by mass.
  • the polymer of the composition containing the sesamol type benzotriazole monomer or the polymer of the composition containing the resorcinol type benzotriazole monomer has a large molecular weight and is difficult to bleed. It is suitable because it is easy to increase.
  • the binder resin examples include a thermoplastic resin, a cured product of a thermosetting resin composition, and a cured product of an ionizing radiation curable resin composition.
  • a thermoplastic resin examples include a thermoplastic resin, a cured product of a thermosetting resin composition, and a cured product of an ionizing radiation curable resin composition.
  • a cured product of a thermosetting resin composition and a cured product of an ionizing radiation curable resin composition are preferable, and a cured product of an ionizing radiation curable resin composition is more preferable.
  • the thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that is cured by heating.
  • the thermosetting resin include acrylic resin, urethane resin, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, and silicone resin.
  • a curing agent is added to these curable resins as necessary.
  • the ionizing radiation curable resin composition is a composition containing a compound having an ionizing radiation curable functional group (hereinafter also referred to as “ionizing radiation curable compound”).
  • ionizing radiation curable compound examples include an ethylenically unsaturated bond group such as a (meth) acryloyl group, a vinyl group, and an allyl group, and an epoxy group and an oxetanyl group. Among them, an ethylenically unsaturated bond group is preferable. . Of the ethylenically unsaturated bond groups, a (meth) acrylate group is preferred.
  • an ionizing radiation curable compound having a (meth) acryloyl group is referred to as a (meth) acrylate compound.
  • (meth) acrylate refers to methacrylate and acrylate.
  • ionizing radiation means an electromagnetic wave or charged particle beam having an energy quantum capable of polymerizing or cross-linking molecules, and usually ultraviolet (UV) or electron beam (EB) is used.
  • electromagnetic waves such as X-rays and ⁇ -rays, and charged particle beams such as ⁇ -rays and ion beams can also be used.
  • the ionizing radiation curable compound is a polyfunctional ionizing radiation curable compound having two or more of the above functional groups, or a polyfunctional ionizing radiation curable compound and a monofunctional ionizing radiation curable having only one of the above functional groups. It is preferable that it is a mixture with an ionic compound.
  • the ionizing radiation curable compound when the ionizing radiation curable compound is an ultraviolet curable compound, the ionizing radiation curable composition preferably contains additives such as a photopolymerization initiator and a photopolymerization accelerator.
  • a photopolymerization initiator include one or more selected from acetophenone, benzophenone, ⁇ -hydroxyalkylphenone, Michler's ketone, benzoin, benzylmethyl ketal, benzoylbenzoate, ⁇ -acyloxime ester, thioxanthones, and the like.
  • the photopolymerization accelerator can reduce polymerization inhibition by air during curing and increase the curing speed. For example, p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, etc. One or more selected may be mentioned.
  • the binder resin of the resin layer a1 may be an adhesive composition or a cured product of the adhesive composition. By setting the binder resin as such a configuration, the resin layer a1 can function as an adhesive layer, and the optical film A1 and other members such as a surface plate can be integrated.
  • the adhesive composition include general-purpose pressure-sensitive adhesive compositions, heat-sensitive adhesive compositions, and ionizing radiation curable adhesive compositions.
  • the resin layer a1 may contain particles. By containing particles in the resin layer, antiglare properties and the like can be imparted.
  • the particles are not particularly limited as long as they have light transmissivity, and both organic particles and inorganic particles can be used.
  • grains is not specifically limited, Shapes, such as spherical shape, disk shape, rugby ball shape, and an indefinite shape, are mentioned.
  • the particles may be hollow particles, porous particles or solid particles.
  • organic particles examples include particles made of polymethyl methacrylate, polyacryl-styrene copolymer, melamine resin, polycarbonate, polystyrene, polyvinyl chloride, benzoguanamine-melamine-formaldehyde condensate, silicone, fluorine resin, polyester resin, and the like. Can be mentioned.
  • examples of the inorganic particles include particles made of silica, alumina, zirconia, titania and the like.
  • the content of the particles is preferably 0.2 to 15.0% by mass, more preferably 0.5 to 10.0% by mass with respect to 100 parts by mass of the binder resin of the resin layer a1. More preferably, the content is 0.0 to 6.0% by mass.
  • the thickness of the resin layer a1 is preferably 1 to 800 ⁇ m, more preferably 2 to 250 ⁇ m, and more preferably 3 to 100 ⁇ m from the viewpoint of easily satisfying the condition 1 and the balance of thinning. More preferably, it is more preferably 5 to 20 ⁇ m.
  • the resin layer a1 may not be directly formed on the polyester film.
  • the optical film A1 may have other layers such as an easy-adhesion layer between the resin layer a1 and the polyester film.
  • the position of the resin layer a1 in the optical film A1 is a position that is the outermost surface on the side opposite to the organic EL element.
  • the optical film A1 may have a functional layer on the surface of the polyester film on the organic EL element side.
  • the functional layer include an adhesion preventing layer, an interference preventing layer, and an ultraviolet absorbing layer.
  • the ultraviolet absorption layer on the organic EL element side may have the same configuration as the resin layer a1 or may have a configuration different from the resin layer a1.
  • the optical film A1 preferably has an average spectral transmittance of 360 to 380 nm of 0.15% or less, preferably 0.10% or less, from the viewpoint of suppressing the fluorescence emission of the polyester film and easily satisfying the condition 1. More preferably, it is 0.05% or less, More preferably, it is 0.02% or less. From the same viewpoint, the optical film A1 preferably has an average spectral transmittance of 370 to 380 nm of 0.15% or less, more preferably 0.10% or less, and 0.05% or less. Is more preferable, and it is further more preferable that it is 0.02% or less.
  • the wavelength of 360 to 380 nm has a great influence on the fluorescence emission of PEN.
  • the spectral transmittance of these wavelength ranges is the said range.
  • the average of the spectral transmittances of 360 to 380 nm and the average of the spectral transmittances of 370 to 380 nm mean the average values of the transmittances of the respective wavelengths when the measurement wavelength is set at 0.5 nm intervals.
  • D65 the light source with a double field of view.
  • positions optical film A1 in the organic electroluminescent display apparatus of 1st embodiment will not be specifically limited if it is on the light-projection surface of an organic EL element.
  • the organic EL display device includes the polarizer 50 as the other optical film (40)
  • the optical film A1 (20) is closer to the viewer than the polarizer (50). It is preferable to install. In other words, it is preferable to install a polarizer between the optical film A1 and the organic EL element.
  • the optical film A1 can be used in an organic EL display device, for example, as a polarizer protective film, a surface plate (30), a constituent member of a touch panel (70), or the like. Further, the optical film A1 can be used in an organic EL display device as a member for suppressing interference unevenness without having the above-described use.
  • the organic EL display device of the first embodiment may have another optical film different from the optical film A1.
  • Examples of other optical films include a polarizer, a 1 / 4 ⁇ plate, a retardation film, and the like.
  • the polarizer is preferably installed between the optical film A1 and the organic EL element.
  • a sheet-type polarizer obtained by dyeing and stretching a polyvinyl alcohol film, a polyvinyl formal film, a polyvinyl acetal film, an ethylene-vinyl acetate copolymer saponified film or the like with iodine or the like; Wire grid polarizers made of metal wires; coating polarizers coated with lyotropic liquid crystal or dichroic guest-host materials; multilayer thin film polarizers; and the like.
  • These polarizers may be reflective polarizers having a function of reflecting a polarization component that does not transmit. It is preferable to cover both surfaces of the polarizer with a transparent protective plate such as a plastic film. It is also possible to use the optical film A1 as the transparent protective plate.
  • a polarizer is used, for example, for imparting antireflection properties in combination with a 1 ⁇ 4 ⁇ plate.
  • the 1 ⁇ 4 ⁇ plate and the retardation film general-purpose ones can be used.
  • the 1 ⁇ 4 ⁇ plate is preferably arranged on the organic EL element side of the polarizer.
  • the retardation film is preferably disposed on the organic EL element side of the polarizer.
  • a surface plate is preferably provided on the outermost surface of the organic EL display device opposite to the organic EL element.
  • the surface plate is preferably a resin surface plate.
  • the polyester film hardly emits fluorescent light due to the ultraviolet absorption characteristics of the glass. For this reason, when a surface board is a resin-made surface board, the effect of 1st embodiment is notably expressed.
  • the resin surface plate may be a single-layer plastic film or may be a laminate of a plurality of plastic films with an adhesive layer interposed therebetween. Moreover, you may use the said optical film A1 as a resin-made surface board.
  • the plastic film constituting the resin surface plate is preferably a polyimide film or an aramid film from the viewpoint of bending resistance.
  • the thickness of the resin surface plate is preferably 10 to 1000 ⁇ m, and more preferably 300 to 800 ⁇ m, from the viewpoint of thinning and protection of the organic EL element.
  • Organic EL elements are mainly classified into three types: a color conversion method, a color filter method, and a three-color independent method.
  • the color conversion method has a basic configuration of a metal electrode, a blue light emitting layer, a fluorescent layer (red fluorescent layer, green fluorescent layer), a color filter (blue color filter), a transparent electrode, and a transparent substrate.
  • a color conversion method light from the blue light emitting layer is converted into red and green by the red fluorescent layer and the green fluorescent layer, and blue is highly saturated through a color filter.
  • the color filter system has a basic configuration including a metal electrode, a white light emitting layer, a color filter (color filters of three colors of red, green, and blue), a transparent electrode, and a transparent substrate.
  • a color filter color filters of three colors of red, green, and blue
  • the three-color independent system has a basic configuration of a metal electrode, a light emitting layer (a red light emitting layer, a green light emitting layer, and a blue light emitting layer exist independently), a transparent electrode, and a transparent substrate.
  • three primary colors of red, green, and blue are created without using a color filter.
  • the organic EL element is preferably a three-color independent type organic EL element.
  • the three-color independent organic EL element has sharp red, green, and blue spectral spectra.
  • the red vertex coordinate has a large x value and a small y value
  • the green vertex coordinate has a small x value.
  • the y value increases, and the blue vertex coordinate has a smaller x value and a smaller y value.
  • the red, green, and blue spectral spectra are sharp, the area of the triangle that connects the vertex coordinates of each of the red, green, and blue colors in the CIE-xy chromaticity diagram increases, and the width of the reproducible color gamut. Becomes wider.
  • the wide color gamut that can be reproduced means that the color gamut is easily affected by external factors (for example, fluorescence emission of the PEN film by ultraviolet rays). For this reason, the three-color independent type organic EL element is preferable in that the effect of the first embodiment is easily exhibited effectively.
  • the light extraction efficiency of the organic EL element is a problem, and in order to improve the light extraction efficiency, the three-color independent type organic EL element is often provided with a microcavity structure.
  • the three-color independent organic EL element having a microcavity structure has sharper red, green, and blue spectral spectra as the light extraction efficiency is improved. For this reason, the three-color independent organic EL element having a microcavity structure is suitable in that the effects of the first embodiment are particularly easily exhibited.
  • Examples of the standard representing the color gamut include “ITU-R Recommendation BT.2020 (hereinafter referred to as“ BT.2020 ”)” and the like.
  • ITU-R is an abbreviation for “International Telecommunication Union-Radiocommunication Sector”.
  • 2020 is an international standard for the color gamut of Super Hi-Vision.
  • the organic EL element has a BT.
  • the coverage of 2020 is preferably 60% or more, more preferably 65% or more, and even more preferably 70% or more.
  • ⁇ BT. Formula expressing coverage ratio of 2020> [Of the area of the CIE-xy chromaticity diagram of the organic EL element, BT. Area overlapping with area of 2020 CIE-xy chromaticity diagram / BT. Area of 2020 CIE-xy chromaticity diagram] ⁇ 100 (%)
  • the “area of the CIE-xy chromaticity diagram of the organic EL element” required for calculating the coverage ratio of 2020 is the x value of the CIE-Yxy color system for red display, green display, and blue display. Each y value is measured, and can be calculated from “red vertex coordinates”, “green vertex coordinates”, and “blue vertex coordinates” obtained from the measurement results.
  • the x value and y value of the CIE-Yxy color system can be measured, for example, with a spectral radiance meter CS-2000 manufactured by Konica Minolta.
  • the transparent substrate constituting the organic EL element may be a glass plate, but is preferably a resin plate.
  • the polyester film hardly emits fluorescent light due to the ultraviolet absorption characteristics of the glass.
  • the transparent board which comprises an organic EL element is a resin board, the effect of 1st embodiment is expressed notably.
  • flexibility can be provided to the organic EL display device by using a transparent substrate constituting the organic EL element as a resin plate. The same can be said for the second embodiment described later.
  • the organic EL display device of the first embodiment preferably does not have a glass plate on the light emission surface side from the light emitting layer of the organic EL element.
  • a glass plate is provided on the light emitting surface side of the light emitting layer of the organic EL element, the polyester film hardly emits fluorescence due to the ultraviolet absorption characteristics of the glass. For this reason, when it does not have a glass plate in the light-projection surface side from the light emitting layer of an organic EL element, the effect of 1st embodiment is expressed notably.
  • flexibility can be provided to the organic EL display device by adopting a configuration in which the glass plate is not provided on the light emitting surface side from the light emitting layer of the organic EL element. The same can be said for the second embodiment described later.
  • the organic EL display device of the first embodiment may be an organic EL display device with a touch panel provided with a touch panel on the light emission surface of the organic EL element.
  • the positional relationship between the touch panel and the optical film A1 is not particularly limited. For example, as shown in FIG. 3, you may have a touch panel (70) between an organic EL element (10) and optical film A1 (20), and a touch panel (70) on optical film A1 (20). You may have. Moreover, you may use optical film A1 (20) as a structural member of a touch panel (70).
  • Examples of the touch panel include a resistive touch panel, a capacitive touch panel, an electromagnetic induction touch panel, an optical touch panel, and an ultrasonic touch panel.
  • the capacitive touch panel includes a surface type and a projection type, and a projection type is often used.
  • a projected capacitive touch panel is configured by connecting a circuit to a basic configuration in which an X-axis electrode and a Y-axis electrode orthogonal to the X-axis electrode are arranged via an insulator.
  • the basic configuration will be described more specifically. (1) A mode in which X-axis electrodes and Y-axis electrodes are formed on separate surfaces on one transparent substrate, (2) X-axis electrodes and insulators on the transparent substrate A mode in which the layers and the Y-axis electrode are formed in this order.
  • a resistive touch panel has a basic configuration in which a conductive film of a pair of upper and lower transparent substrates having a conductive film is arranged with a spacer so as to face each other, and a circuit is connected to the basic configuration. is there.
  • Specific examples of using the optical film A1 (20) as a constituent member of the touch panel include a configuration using the optical film A1 (20) as the transparent substrate of the capacitive touch panel, and the optical film A1 as the transparent substrate of the resistive touch panel.
  • the structure using (20) is mentioned.
  • the second embodiment of the organic EL display device of the present invention is an organic EL display device having an optical laminate A2 on the light emitting surface of the organic EL element, the optical laminate A2 comprising a polyester film, A resin layer a2 containing an ultraviolet absorber disposed on the opposite side of the polyester film from the organic EL element, the optical laminate A2 does not include a polarizer, and the optical laminate A2 Satisfies the following condition 2.
  • a black light having a center wavelength of 365 nm is arranged on the outermost surface on the resin layer a2 side of the polyester film of the optical laminate A2 so that the light emitting surface of the black light and the optical film are parallel to each other.
  • a spectral radiance meter is disposed at a position facing the black light with the optical layered body A2 interposed therebetween.
  • the black light is emitted, and a spectral radiance x2 of light in a normal direction of a surface opposite to the surface irradiated with the black light of the optical layered body A2 by the spectral radiance meter has a wavelength of 400 to 470 nm.
  • the measurement is performed every 1 nm in the region.
  • the spectral radiance meter 2 measures the spectral radiance y2 of light in the normal direction of the black light itself in a wavelength range of 400 to 470 nm every 1 nm.
  • FIGS. 4 to 6 are sectional views showing an example of the second embodiment of the organic EL display device of the present invention.
  • the organic EL display device (100) of FIGS. 4 to 6 has an optical laminate A2 (60) on the light emitting surface of the organic EL element (10).
  • the optical laminate A2 (60) includes a polyester film (61) and a resin layer a2 containing a UV absorber disposed on the side opposite to the organic EL element of the polyester film. (62).
  • the optical laminate A2 (60) does not include a polarizer.
  • 4 to 6 includes a polarizer (50) between the organic EL element (10) and the optical laminate A2 (60).
  • each member is integrated and laminated
  • all members are not integrated, and an air layer is interposed between the touch panel (70) and the hard coat layer (63). Note that the air layer in FIG. 6 exaggerates the distance between the touch panel (70) and the hard coat layer (63) in order to make it easy to understand that the air layer is interposed.
  • the resin layer a2 (62) also serves as the adhesive layer (80).
  • the organic EL element (10) of the organic EL display device (100) of FIGS. 4 to 6 shows an embodiment of the three-color independent type organic EL element.
  • Condition 2 indicates that fluorescence emission is prevented from being generated from the polyester-based film constituting the optical laminate A2 when irradiated with ultraviolet rays (black light). If the condition 2 is not satisfied, the screen feels pale when used outdoors.
  • polyester films such as PEN films and PET films emit fluorescent light in the short wavelength region of visible light when irradiated with ultraviolet rays (FIGS. 7 and 8). Therefore, the same phenomenon occurs when the optical laminate A2 including the polyester film is irradiated with ultraviolet rays.
  • a resin layer a2 containing an ultraviolet absorber is formed on the opposite side of the polyester film of the optical laminate A2 from the polyester film, when the ultraviolet ray is irradiated, It is possible to prevent the occurrence of fluorescence and satisfy the condition 2.
  • Condition 2 preferably satisfies the relationship T 2 / L 2 ⁇ 0.70, more preferably satisfies the relationship T 2 / L 2 ⁇ 0.50, and the relationship T 2 / L 2 ⁇ 0.45. It is further preferable to satisfy
  • the black light used in Condition 2 has the above L 2 (cumulative value of spectral radiance y2 of light in the normal direction of the black light of each wavelength of 400 to 470 nm) of 0.0020 W / sr / m 2 / nm or less. It is preferable that it is 0.0015 W / sr / m 2 / nm or less.
  • optical laminate A2 has a polyester film and a resin layer a2 containing an ultraviolet absorber disposed on the side opposite to the organic EL element of the polyester film, and does not include a polarizer. 2 is satisfied.
  • the optical laminate A2 is formed by laminating each member so as to be integrated through an adhesive layer 80 as shown in FIGS. 4 and 5, and as shown in FIG. Any of a part or all of them superposed without an adhesive layer or the like may be used. From the viewpoint of suppressing the interface reflection, it is preferable that the members of the optical laminate A2 are integrated through an adhesive layer without having an air layer.
  • polyester film constituting the optical laminate A2 can adopt the same embodiment as the polyester film of the first embodiment described above.
  • the resin layer a2 is a layer containing an ultraviolet absorber, and is disposed on the opposite side of the polyester film from the organic EL element in the organic EL display device.
  • the position of the resin layer a2 in the optical laminate A2 is not particularly limited as long as it is on the side opposite to the organic EL element with respect to the polyester film. As shown in FIG. 4, the position of the resin layer a2 (62) is between the polyester film (61) and the surface plate (30), and as shown in FIG. 5, the polyester film (61) and the touch panel ( 70), as shown in FIG. 6, on the touch panel (70). 4 and 6, the resin layer a2 (62) may also serve as the adhesive layer (80).
  • the embodiment of the resin layer a2 can adopt the same embodiment as the resin layer a1 of the first embodiment described above. By making the resin layer a2 have this configuration, the condition 2 can be easily satisfied.
  • the optical laminate A2 may have a member other than the polyester film and the resin layer A2.
  • the surface plate constituting the optical laminate A2 is preferably a resin surface plate.
  • the surface plate may be incorporated in the optical laminate A2 as a constituent member of the optical laminate A2, or may be a constituent member different from the optical laminate A2.
  • the same embodiment as the touch panel of 1st Embodiment mentioned above can be employ
  • the touch panel may be incorporated in the optical laminate A2 as a constituent member of the optical laminate A2, or may be a constituent member different from the optical laminate A2.
  • a glass plate is not included in the structural member of optical laminated body A2.
  • fluorescent light emission of the polyester film is less likely to occur due to the ultraviolet absorption characteristics of glass.
  • the effect of 2nd embodiment is notably expressed.
  • the optical laminate A2 preferably has an average spectral transmittance of 360 to 380 nm of 0.15% or less, and 0.10%. Or less, more preferably 0.05% or less, and even more preferably 0.02% or less. From the same viewpoint, the optical laminate A2 preferably has an average spectral transmittance of 370 to 380 nm of 0.15% or less, more preferably 0.10% or less, and 0.05% or less. More preferably, it is 0.02% or less.
  • the organic EL display device of the second embodiment may have a polarizer, a retardation film, etc. as other optical films.
  • the same embodiments as the polarizer and the retardation film of the first embodiment described above can be adopted.
  • the polarizer is preferably installed between the optical film laminate A2 and the organic EL element.
  • the embodiment of the polarizer in the organic EL display device of the second embodiment can adopt the same embodiment as the polarizer of the first embodiment described above.
  • the polarizer may be integrated with the optical film laminate A2 via an adhesive layer.
  • the embodiment of the organic EL element of the second embodiment can adopt the same embodiment as the organic EL element of the first embodiment described above.
  • the transparent substrate constituting the organic EL element may be a glass plate, but is preferably a resin plate.
  • the organic EL display device of the second embodiment does not have a glass plate on the light emission surface side from the light emitting layer of the organic EL element.
  • polyester film ⁇ Production of PEN film> Polyethylene naphthalate was melted at 290 ° C., extruded through a film-forming die, into a sheet form, and brought into intimate contact with a water-cooled and cooled rapid quenching drum to produce an unstretched film.
  • This unstretched film is preheated at 120 ° C. for 1 minute using a biaxial stretching test apparatus (Toyo Seiki Co., Ltd.) and then stretched uniaxially at a fixed end of 4.0 times at 120 ° C. to have in-plane birefringence.
  • An optical film was produced.
  • the film thickness of this optical film was adjusted to obtain a PEN film having a retardation value of 12,000 nm.
  • the film thickness of this optical film was adjusted to obtain a PET film having a retardation value of 10,000 nm.
  • a polymerization reaction was carried out at reflux temperature of 90 to 96 ° C. for 10 hours. After completion of the polymerization reaction, a solvent (toluene and methyl ethyl ketone) was added to obtain a solution (solid content 40% by mass) containing a sesamol type benzotriazole-based ultraviolet absorber.
  • An optical film A1-2 (optical film of Comparative Example 1) was obtained in the same manner as the optical film A1-1 except that the coating liquid 1 for the resin layer a1 was changed to the following coating liquid 2 for the resin layer.
  • optical film A1-3 optical film of Comparative Example 2
  • the PEN film prepared in the above “1” was prepared.
  • the optical film A1-4 optical film of Comparative Example 3
  • the optical films A1-1 to A1-4 and the light emitting surface of the black light were arranged in parallel.
  • the optical film A1-1 and the optical film A1-2 were arranged so that the surface on the resin layer side of the optical film faces the light emitting surface side of the black light.
  • the distance between the optical films A1-1 to A1-4 and the light emitting surface of the black light was 1 cm (height of the outer edge of the black light).
  • a black light is emitted, and the spectral radiance x1 of the light in the normal direction of the surface opposite to the surface irradiated with the black light of the optical films A1-1 to A1-4 is obtained by the spectral radiance meter. Measurement was performed every 1 nm in a wavelength range of 400 to 470 nm (measurement angle was 0.2 degrees). A cumulative value T 1 of the spectral radiance x1 of each wavelength of 400 to 470 nm was calculated.
  • spectral transmittance Using a spectrophotometer (manufactured by Shimadzu Corporation, trade name: UV-2450), the spectral transmittance of optical films A1-1 to A1-4 at 360 to 380 nm was measured at intervals of 0.5 nm. The average spectral transmittance at 360 to 380 nm and the spectral transmittance at 370 to 380 nm were calculated. The measurement conditions for the spectral transmittance were a double field of view and D65 as the light source.
  • Evaluation A commercially available organic EL display device (the organic EL element is a three-color independent system having a microcavity structure. The coverage of BT.2020 is 77%) was prepared.
  • Optical films A1-1 to A1-4 were bonded to the outermost surface of the organic EL display device via an acrylic adhesive.
  • the optical films A1-1 and A1-2 were arranged so that the resin layer side faces the surface side (the side opposite to the organic EL element).
  • the organic EL display device to which the optical films A1-1 to A1-4 were bonded was taken out outdoors on a sunny day, and the state of the image was visually evaluated. “A” indicates that the color does not feel pale, “C” indicates that the color is slightly felt, and “D” indicates that the color is strongly felt.
  • the T 1 / L 1 is 1.00 or less
  • the organic EL display device of Example 1 satisfying the condition 1 be used outdoors when in color (paleness) problems will occur I can confirm.
  • the organic EL display apparatus of Example 1 was a thing in which the interference nonuniformity peculiar to a retardation value was not confirmed when polarizing sunglasses were observed and the image was observed.
  • Organic EL element 20 Organic EL element 20: Optical film A1 21: Polyester film 22: Resin layer a1 30: Surface plate 40: Other optical film 50: Polarizer 60: Optical laminate A2 61: Polyester film 62: Resin layer a2 63: Hard coat layer 70: Touch panel 80: Adhesive layer 100: Organic EL display device 100A: Organic EL display device with touch panel

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