Abstract: The present invention provides a display device which can attain higher contrast than that of the conventional display device. The display device (1) comprises: an image light source (2); and an optical sheet (10) having a plurality of layers for controlling an incident light from the image light source and for outputting the light to the observer side, wherein the optical sheet comprises an optical functional sheet layer (12) in which light-transmissive portion(s) (13) configured to transmit light and light-absorbing portion(s) (14) configured to absorb light are alternately arranged along the sheet plane, and only one layer (11) or a plurality of layers of which refractive indices are substantially the same is(are) provided on the observer side of the optical functional sheet layer.

Abstract: A sheet-like optical member being difficult to damage a shape of a lens part. The sheet-like optical member includes: a substrate; and a lens part, which is formed on the substrate, is made of an active energy ray-curable resin, and has a plurality of unit prisms. The maximum logarithmic attenuation rate ?E of the lens part measured by a rigid body pendulum method is 0.4 or less.

Abstract: The present invention provides a display device which can attain higher contrast than that of the conventional display device. The display device (1) comprises: an image light source (2); and an optical sheet (10) having a plurality of layers for controlling an incident light from the image light source and for outputting the light to the observer side, wherein the optical sheet comprises an optical functional sheet layer (12) in which light-transmissive portion(s) (13) configured to transmit light and light-absorbing portion(s) (14) configured to absorb light are alternately arranged along the sheet plane, and only one layer (11) or a plurality of layers of which refractive indices are substantially the same is (are) provided on the observer side of the optical functional sheet layer.

Abstract: A sheet-like optical member being difficult to damage a shape of a lens part. The sheet-like optical member includes: a substrate; and a lens part, which is formed on the substrate, is made of an active energy ray-curable resin, and has a plurality of unit prisms. The maximum logarithmic attenuation rate ?E of the lens part measured by a rigid body pendulum method is 0.4 or less.

Abstract: The present invention relates to a receiving-layer-forming polyester resin for use in a thermal-transfer image-receiving sheet, comprising: not less than 70 mol % of isophthalic acid and not more than 30 mol % of terephthalic acid as acid components; and not less than 30 mol % of diols having an alicyclic structure and not more than 30 mol % of ethylene glycol as diol components, and a thermal-transfer image-receiving sheet with a receiving layer formed on at least one of surfaces of the substrate sheet, in which the receiving layer is formed by such a receiving-layer-forming polyester resin.

Abstract: The present invention relates to a receiving-layer-forming polyester resin for use in a thermal-transfer image-receiving sheet, comprising: not less than 70 mol % of isophthalic acid and not more than 30 mol % of terephthalic acid as acid components; and not less than 30 mol % of diols having an alicyclic structure and not more than 30 mol % of ethylene glycol as diol components, and a thermal-transfer image-receiving sheet with a receiving layer formed on at least one of surfaces of the substrate sheet, in which the receiving layer is formed by such a receiving-layer-forming polyester resin.

Abstract: A thermal transfer image-receiving sheet comprising: a receiving layer comprising a polyester resin, which is formed on at least one of faces of a substrate sheet as an outermost surface layer, wherein the receiving layer has a storage elastic modulus of not less than 2,000 [Pa] and a loss elastic modulus of not less than 10,000 [Pa] as dynamic viscoelasticity at 160° C. and the resin component contains an alicyclic carboxylic acid and/or an alicyclic diol.