An optical assembly, comprising: a first layer; a plurality of light sources (220, 221, 222) disposed over the first layer; and a second layer that is disposed above the first layer and covering the light sources (220, 221, 222) on the first layer, and formed of a light transmissive material, wherein a plurality of light sources (220, 222) having a light emitting surface facing a first direction are disposed as a first light source array and a plurality of light sources having a light emitting surface facing a second direction opposite to the first direction are disposed as a second light source array, the first light source array includes a plurality of light source lines including a first light source line, the second light source array includes a plurality light source lines including a second light source line which is disposed adjacent to the first line, the plurality of light sources (220, 222) included in the first light source array and the plurality of light sources included in the second light source array emit light in opposite directions from each other, wherein the light emission of each light source (200, 221,222) is centered on a direction parallel to the line to which the light source belongs the plurality of light source lines of the first light source array and the plurality of light source lines of the second light source array are alternatively disposed, a first light source is included in the first light source line, a second light source is included in the second light source line, and a third light source is a light source adjacent to the first light source in the direction of the light emission of the first light source and included in the first light source line, the second light source is disposed on a vertical line perpendicular to the first light source line and passing between the first light source and the third light source, a distance between the first light source and the vertical line is larger than a distance between the third light source and the vertical line. a first layer; a plurality of light sources (220, 221, 222) disposed over the first layer; and a second layer that is disposed above the first layer and covering the light sources (220, 221, 222) on the first layer, and formed of a light transmissive material, wherein a plurality of light sources (220, 222) having a light emitting surface facing a first direction are disposed as a first light source array and a plurality of light sources having a light emitting surface facing a second direction opposite to the first direction are disposed as a second light source array, the first light source array includes a plurality of light source lines including a first light source line, the second light source array includes a plurality light source lines including a second light source line which is disposed adjacent to the first line, the plurality of light sources (220, 222) included in the first light source array and the plurality of light sources included in the second light source array emit light in opposite directions from each other, wherein the light emission of each light source (200, 221,222) is centered on a direction parallel to the line to which the light source belongs the plurality of light source lines of the first light source array and the plurality of light source lines of the second light source array are alternatively disposed, a first light source is included in the first light source line, a second light source is included in the second light source line, and a third light source is a light source adjacent to the first light source in the direction of the light emission of the first light source and included in the first light source line, the second light source is disposed on a vertical line perpendicular to the first light source line and passing between the first light source and the third light source, a distance between the first light source and the vertical line is larger than a distance between the third light source and the vertical line.