Dai Nippon Printing Co., Ltd.

Yuko Fujioka

Takeshi Sakamoto

Ryutaro Harada

Shuichi Tamura

Akihito Haruki

Shota Yamanishi

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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Matsudo, Japan

Yuko Fujioka