Abstract: An optical sheet laminate 100 is built in a backlight unit 40. The optical sheet laminate 100 includes a plurality of diffusion sheets 43 each having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape, and a pair of prism sheets 44 and 45 arranged above the plurality of diffusion sheets 43 and having prism extending directions perpendicular to each other. The recesses 22 have an apex angle of 95° or more. The recesses 22 are arrayed in a two-dimensional matrix. The prism extending direction of a lower prism sheet 44 and the arrangement direction of the recesses 22 on an upper diffusion sheet 43A intersect with each other at an angular difference of 30° or less.

Abstract: A light diffusion sheet is incorporated in a backlight unit using a plurality of light sources arranged in a two-dimensional matrix. The light diffusion sheet has surfaces, on at least one of which a plurality of recesses having a substantially inverted quadrangular pyramid shape are arranged in a two-dimensional matrix. An intersecting angle between an arrangement direction of the plurality of recesses and an arrangement direction of the plurality of light sources is 30° or more and 60° or less.

Abstract: An optical sheet laminate 100 is built in a backlight unit 40. The optical sheet laminate 100 includes a plurality of diffusion sheets 43 each having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape, and a pair of prism sheets 44 and 45 arranged above the plurality of diffusion sheets 43 and having prism extending directions perpendicular to each other. The recesses 22 have an apex angle of 95° or more. The recesses 22 are arrayed in a two-dimensional matrix. The prism extending direction of a lower prism sheet 44 and the arrangement direction of the recesses 22 on an upper diffusion sheet 43A intersect with each other at an angular difference of 30° or less.

Abstract: A light diffusion sheet 43 is incorporated in a backlight unit 40 using a plurality of light sources 42 arranged in a two-dimensional matrix. The light diffusion sheet 43 has surfaces, on at least one of which a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape are arranged in a two-dimensional matrix. An intersecting angle between an arrangement direction of the plurality of recesses 22 and an arrangement direction of the plurality of light sources 42 is 30° or more and 60° or less.

Abstract: When at least one scope of 0.5 mm square or more of a surface of an optical sheet having the unevenness is measured, height data of each of a plurality of pixels of an image obtained is determined, an approximated surface is calculated, from the height data of each pixel, for a minute region of 100 ?m2 or less, and a calculation is repeatedly performed to obtain an inclination angle between: (i) a flat surface appearing after the unevenness is imaginarily removed and: (ii) the approximated surface, while two-dimensionally shifting the minute region at equal intervals along the flat surface by using at least one of the pixels as a unit to obtain a plurality of minute regions, a total area of some of the minute regions each having the inclination angle of 30° or more, accounts for 30% or more of a total area of all the minute regions.

Abstract: A light-diffusing sheet 43 includes a plurality of depressed portions 22 formed in an approximately inverted polygonal pyramid or an approximately inverted truncated polygonal pyramid on at least a first surface 43a. An array pitch of the plurality of depressed portions 22 is 300 ?m or more and 1500 ?m or less. A width of a boundary portion between adjacent depressed portions 22 in the plurality of depressed portions 22 is 25% of the array pitch or less.

Abstract: An optical sheet laminate 100 is to be incorporated into a backlight unit 40 having blue light sources 42. The optical sheet laminate 100 include: a diffusion sheet 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape; and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. The diffusion sheet 43 includes one or a plurality of diffusion sheets in layers. The plurality of recesses 22 are arranged in a two-dimensional matrix, and the intersecting angle between an arrangement direction of the plurality of recesses 22 and the prism extending direction is 20° or more and 70° or less.

Abstract: A light diffusion sheet 43 is incorporated in a backlight unit 40 using a plurality of light sources 42 arranged in a two-dimensional matrix. The light diffusion sheet 43 has surfaces, on at least one of which a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape are arranged in a two-dimensional matrix. An intersecting angle between an arrangement direction of the plurality of recesses 22 and an arrangement direction of the plurality of light sources 42 is 30° or more and 60° or less.

Abstract: An optical sheet laminate 100 is incorporated into a backlight unit 40. The optical sheet laminate 100 includes a plurality of diffusion sheets 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape and arranged in a two-dimensional matrix, and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. The plurality of diffusion sheets 43 include at least two diffusion sheets 43 where an arrangement direction of the recesses 22 of one of the at least two diffusion sheets 43 is different from that of the recesses of another one of the at least two diffusion sheets 43.

Abstract: An optical sheet laminate 100 to be incorporated into a backlight unit 40 includes a plurality of diffusion sheets 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted polygonal pyramid shape, and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. An arrangement direction of the recesses 22 of one of the plurality of diffusion sheets 43 closest to the prism sheets 44 and 45 intersects with the prism extending directions at an angle of 0° or more and 20° or less, or 70° or more and 90° or less.

Abstract: An optical sheet laminate 100 is built in a backlight unit 40. The optical sheet laminate 100 includes a plurality of diffusion sheets 43 each having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape, and a pair of prism sheets 44 and 45 arranged above the plurality of diffusion sheets 43 and having prism extending directions perpendicular to each other. The recesses 22 have an apex angle of 95° or more. The recesses 22 are arrayed in a two-dimensional matrix. The prism extending direction of a lower prism sheet 44 and the arrangement direction of the recesses 22 on an upper diffusion sheet 43A intersect with each other at an angular difference of 30° or less.

Abstract: An optical sheet laminate 100 is to be incorporated into a backlight unit 40 having white light sources 42. The optical sheet laminate 100 include: a diffusion sheet 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape; and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. The diffusion sheet 43 includes one or a plurality of diffusion sheets in layers. The plurality of recesses 22 are arranged in a two-dimensional matrix, and the intersecting angle between an arrangement direction of the plurality of recesses 22 and the prism extending direction is 20° or more and 70° or less.

Abstract: An optical sheet 43 is built into a liquid crystal display apparatus in which a plurality of light sources 42 are dispersed on a back surface side of a display screen. One surface of the optical sheet 43 has an uneven surface. In a predetermined region R on the one surface of the optical sheet 43, a luminance enhancer 25 that improves the total light transmittance of the predetermined region R is provided so as to at least partially fill recesses 22a of the uneven surface.

Abstract: An optical sheet laminate 100 to be incorporated into a backlight unit 40 includes a plurality of diffusion sheets 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape, and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. An arrangement direction of the recesses 22 of one of the plurality of diffusion sheets 43 closest to the prism sheets 44 and 45 intersects with the prism extending directions at an angle of 0° or more and 20° or less, or 70° or more and 90° or less.

Abstract: One aspect of the present invention is a light diffusion sheet having a first surface on which a plurality of recesses that diffuse light are formed, and a second surface on which a plurality of projections that can transmit light are provided apart from each other.

Abstract: An optical sheet laminate 100 to be incorporated into a backlight unit 40 includes a plurality of diffusion sheets 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape, and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. An arrangement direction of the recesses 22 of one of the plurality of diffusion sheets 43 closest to the prism sheets 44 and 45 intersects with the prism extending directions at an angle of 0° or more and 20° or less, or 70° or more and 90° or less.

Abstract: An optical sheet laminate 100 is to be incorporated into a backlight unit 40 having white light sources 42. The optical sheet laminate 100 include: a diffusion sheet 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape; and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. The diffusion sheet 43 includes one or a plurality of diffusion sheets in layers. The plurality of recesses 22 are arranged in a two-dimensional matrix, and the intersecting angle between an arrangement direction of the plurality of recesses 22 and the prism extending direction is 20° or more and 70° or less.

Abstract: An optical sheet laminate 100 is incorporated into a backlight unit 40. The optical sheet laminate 100 includes a plurality of diffusion sheets 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape and arranged in a two-dimensional matrix, and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. The plurality of diffusion sheets 43 include at least two diffusion sheets 43 where an arrangement direction of the recesses 22 of one of the at least two diffusion sheets 43 is different from that of the recesses of another one of the at least two diffusion sheets 43.

Abstract: An optical sheet laminate 100 is to be incorporated into a backlight unit 40 having blue light sources 42. The optical sheet laminate 100 include: a diffusion sheet 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape; and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. The diffusion sheet 43 includes one or a plurality of diffusion sheets in layers. The plurality of recesses 22 are arranged in a two-dimensional matrix, and the intersecting angle between an arrangement direction of the plurality of recesses 22 and the prism extending direction is 20° or more and 70° or less.

Abstract: An optical sheet laminate 100 is to be incorporated into a backlight unit 40 having white light sources 42. The optical sheet laminate 100 include: a diffusion sheet 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape; and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. The diffusion sheet 43 includes one or a plurality of diffusion sheets in layers. The plurality of recesses 22 are arranged in a two-dimensional matrix, and the intersecting angle between an arrangement direction of the plurality of recesses 22 and the prism extending direction is 20° or more and 70° or less.