Dai Nippon Printing Co., Ltd.

Akihito Haruki

Takeshi Sakamoto

Shuichi Tamura

Ryutaro Harada

Shota Yamanishi

Tatsuji Nakajima

Yuko Fujioka

Ryoma Yasui

Provided is a barrier film that can suppress a change in color when applied to a wavelength conversion sheet. A barrier film for a wavelength conversion sheet, comprising an inorganic oxide layer A, an organic coating layer B, an inorganic oxide layer C, and an organic coating layer D in presented order on a light-transmitting base material; wherein refractive indexes of the inorganic oxide layer A, the organic coating layer B, the inorganic oxide layer C, and the organic coating layer D are defined as n, n, n, and n, respectively; thicknesses of the organic coating layer B and the organic coating layer D are defined as tand t, respectively; nand nare larger than nand n; and drepresented by the following expression 1 represents a range of x±0.10 wherein x is an integer of 2 to 13./112.5 nm+/112.5 nm  (Expression 1)

Barrier film, wavelength conversion sheet using same, backlight and liquid crystal display device

Provided is a barrier film for a wavelength conversion sheet that, when applied to a wavelength conversion sheet, can suppress in-plane uneven brightness of the wavelength conversion sheet. A barrier film for a wavelength conversion sheet, the barrier film including a first base material film, a second base material film, a barrier layer, a primer layer, and an adhesive layer positioned between the first base material film and the second base material film, wherein the barrier film satisfies the following condition 1: <Condition 1> A surface of the barrier film on a side having the primer layer with respect to the adhesive layer is defined as a surface 1; an elevation of the surface 1 is measured at intervals of 1 mm to obtain elevation data about the surface 1; a contour curve of the surface 1 determined by the elevation data is defined as a contour curve 1; at least a part of the surface 1 has at least one irregularity 1 having a height difference between an adjacent peak and valley of 0.001 mm or more and 0.600 mm or less in the contour curve 1 in a predetermined direction; when a height difference and a width of the irregularity 1 are defined as H [mm] and W [mm], respectively, the following expression (1): H/W≤1.5×10(1) is satisfied.

Barrier film for wavelength conversion sheet, wavelength conversion sheet, backlight, and liquid crystal display device using barrier film, and method for selecting barrier film for wavelength conversion sheet

Provided is a barrier film that can suppress a change in color when applied to a wavelength conversion sheet. A barrier film for a wavelength conversion sheet, comprising an inorganic oxide layer A, an organic coating layer B, an inorganic oxide layer C, and a primer layer D in presented order on a light-transmitting base material, wherein thicknesses of the light-transmitting base material, the inorganic oxide layer A, the organic coating layer B, the inorganic oxide layer C, and the primer layer D are defined as t, t, t, t, and t, respectively; tis 150 nm or more and 500 nm or less; and t/tis 0.55 or more and 1.65 or less.

Barrier film, and wavelength conversion sheet, back light, and liquid crystal display device which use same

Provided is a film for a wavelength conversion sheet that can suppress a change in color with time when applied to a wavelength conversion sheet. A film for a wavelength conversion sheet, comprising a primer layer and a first base material film in presented order, wherein a refractive index of the primer layer is defined as n, a thickness of the primer layer is defined as t, and a refractive index of the first base material film is defined as n, and the following condition 1 or the following condition 2 is satisfied: Condition 1: n<n, and drepresented by the following expression 1 represents a range of x±0.10 wherein x is an odd integer; Condition 2: n>n, and drepresented by the following expression 1 represents a range of x±0.10 wherein x is an even integer; Expression 1: d=n×t/112.5 nm.

Film for wavelength conversion sheet, and wavelength conversion sheet, backlight, and liquid crystal display device which use same

Provided is a barrier film that can suppress a change in color when applied to a wavelength conversion sheet. A barrier film for a wavelength conversion sheet that is a barrier film comprising at least one inorganic oxide layer and at least one organic coating layer on one surface of a light-transmitting base material, wherein a value of a water vapor transmission rate according to JIS K7129-2:2019 is 0.20 g/m·day or less, and when a spectral transmittance of the barrier film is measured with a surface of a side comprising the inorganic oxide layer and the organic coating layer as a light coming-in surface, the barrier film comprises a spectral transmittance bottom at which the spectral transmittance changes from decreasing to increasing, or a spectral transmittance peak at which the spectral transmittance changes from increasing to decreasing, in the range of 450 nm±7 nm.

Barrier film, and wavelength conversion sheet, backlight, and liquid crystal display device in which same is used, as well as method for selecting barrier film

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Saitama, Japan

Akihito Haruki