A light emitting device module comprising: a substrate comprising a plurality of light emitting areas; a light emitting device disposed in each light emitting area to emit a light; windows disposed on the substrate, each of the windows covering each light emitting area and having an asymmetrical shape with respect to a line (B-B') passing through the center of the window; and a holder to hold the windows, the holder being provided with openings, each of which is defined therethrough in an asymmetrical shape corresponding to the each window in the light emitting areas, wherein each of the windows is individually provided in a corresponding opening among the openings and detachably coupled to the holder, wherein each of the window and the holder comprises an insertion member (35, 45) that determines a coupling direction when the each window and the holder are coupled to each other, and the insertion member (35, 45) has an asymmetrical shape with respect to the line (B-B') passing through the center of the window, each window further comprises an insertion protrusion protruded toward the holder, and the holder further comprises an insertion recess into which the insertion protrusion is inserted, characterized in that the insertion protrusion comprises a first insertion protrusion and a second insertion protrusion, which are respectively disposed at both sides of the each window, and the first and second insertion protrusions (45a, 45b) have different lengths from each other, the insertion recess comprises a first insertion recess and a second insertion recess, the insertion recesses (35a, 35b) corresponding to the first and second insertion protrusions (45a, 45b) have different lengths from each other, and wherein the light emitted from the light emitting device has an anisotropy, and protruding directions of the first and second insertion protrusions (45a, 45b) correspond to the anisotropy of the light, so as to align the window such that the light is emitted in a predetermined direction in response to the anisotropy of the light, wherein the protruding directions of the first and second insertion protrusions (45a, 45b) of the window disposed in each light emitting area are same as each other. a substrate comprising a plurality of light emitting areas; a light emitting device disposed in each light emitting area to emit a light; windows disposed on the substrate, each of the windows covering each light emitting area and having an asymmetrical shape with respect to a line (B-B') passing through the center of the window; and a holder to hold the windows, the holder being provided with openings, each of which is defined therethrough in an asymmetrical shape corresponding to the each window in the light emitting areas, wherein each of the windows is individually provided in a corresponding opening among the openings and detachably coupled to the holder, wherein each of the window and the holder comprises an insertion member (35, 45) that determines a coupling direction when the each window and the holder are coupled to each other, and the insertion member (35, 45) has an asymmetrical shape with respect to the line (B-B') passing through the center of the window, each window further comprises an insertion protrusion protruded toward the holder, and the holder further comprises an insertion recess into which the insertion protrusion is inserted, characterized in that the insertion protrusion comprises a first insertion protrusion and a second insertion protrusion, which are respectively disposed at both sides of the each window, and the first and second insertion protrusions (45a, 45b) have different lengths from each other, the insertion recess comprises a first insertion recess and a second insertion recess, the insertion recesses (35a, 35b) corresponding to the first and second insertion protrusions (45a, 45b) have different lengths from each other, and wherein the light emitted from the light emitting device has an anisotropy, and protruding directions of the first and second insertion protrusions (45a, 45b) correspond to the anisotropy of the light, so as to align the window such that the light is emitted in a predetermined direction in response to the anisotropy of the light, wherein the protruding directions of the first and second insertion protrusions (45a, 45b) of the window disposed in each light emitting area are same as each other.