A display device comprising: a display panel including a plurality of pixels each having a plurality of sub-pixels; and a light path adjustment film on the display panel, wherein the light path adjustment film includes a first base film (221, 531), and a pattern layer (222, 521) on a surface of the first base film, wherein the pattern layer includes a plurality of first patterns (224, (121, P1) having a first refractive index, and a plurality of second patterns (225, P2) between the first patterns and having a second refractive index, wherein the second refractive index is less than the first refractive index, wherein the second patterns are disposed between the first patterns and the thickness of the second pattern is same as the thickness of the first pattern so that the adjacent first patterns are discretely disposed to each other by the second pattern therebetween, and wherein the first pattern includes a top surface spaced apart from the display panel and parallel with the display panel, a bottom surface between the top surface and the display panel, and a slanted surface connecting the top surface and the bottom surface: wherein either: the bottom surface of the first pattern has a size greater than that of the top surface of the first pattern and wherein each first pattern corresponds to each sub-pixel, wherein the size of the top surface of the first pattern is greater than that of an opening region (111a, 113a) of the sub-pixel, and wherein the size of the bottom surface of the first pattern is equal to or less than that of the sub-pixel; or the top surface of the first pattern has a size greater than that of the bottom surface of the first pattern; and wherein each first pattern corresponds to each sub-pixel, wherein the size of the bottom surface of the first pattern is greater than that of an opening region of the sub-pixel, and wherein the size of the top surface of the first pattern is equal to or less than that of the sub-pixel. a display panel including a plurality of pixels each having a plurality of sub-pixels; and a light path adjustment film on the display panel, wherein the light path adjustment film includes a first base film (221, 531), and a pattern layer (222, 521) on a surface of the first base film, wherein the pattern layer includes a plurality of first patterns (224, (121, P1) having a first refractive index, and a plurality of second patterns (225, P2) between the first patterns and having a second refractive index, wherein the second refractive index is less than the first refractive index, wherein the second patterns are disposed between the first patterns and the thickness of the second pattern is same as the thickness of the first pattern so that the adjacent first patterns are discretely disposed to each other by the second pattern therebetween, and wherein the first pattern includes a top surface spaced apart from the display panel and parallel with the display panel, a bottom surface between the top surface and the display panel, and a slanted surface connecting the top surface and the bottom surface: wherein either: the bottom surface of the first pattern has a size greater than that of the top surface of the first pattern and wherein each first pattern corresponds to each sub-pixel, wherein the size of the top surface of the first pattern is greater than that of an opening region (111a, 113a) of the sub-pixel, and wherein the size of the bottom surface of the first pattern is equal to or less than that of the sub-pixel; or the top surface of the first pattern has a size greater than that of the bottom surface of the first pattern; and wherein each first pattern corresponds to each sub-pixel, wherein the size of the bottom surface of the first pattern is greater than that of an opening region of the sub-pixel, and wherein the size of the top surface of the first pattern is equal to or less than that of the sub-pixel. the bottom surface of the first pattern has a size greater than that of the top surface of the first pattern and wherein each first pattern corresponds to each sub-pixel, wherein the size of the top surface of the first pattern is greater than that of an opening region (111a, 113a) of the sub-pixel, and wherein the size of the bottom surface of the first pattern is equal to or less than that of the sub-pixel; or the top surface of the first pattern has a size greater than that of the bottom surface of the first pattern; and wherein each first pattern corresponds to each sub-pixel, wherein the size of the bottom surface of the first pattern is greater than that of an opening region of the sub-pixel, and wherein the size of the top surface of the first pattern is equal to or less than that of the sub-pixel.