A display device is provided. The display device according to the present disclosure includes: a display panel; a frame positioned behind the display panel; a substrate having an elongated shape and coupled to the frame; an optical assembly mounted on the substrate and configured to provide light to the display panel; and a plurality of holders coupling the substrate to the frame, wherein the plurality of holders includes: a first holder disposed adjacent to a first elongated side of the substrate; and a second holder disposed adjacent to a second elongated side of the substrate opposite the first elongated side and positioned opposite to the first holder, wherein the first holder and the second holder are configured to secure the substrate.