A display device is disclosed. The display device comprises: a display panel; an optical layer positioned at a rear of the display panel, the optical layer providing the display panel with light; a side frame including: a side frame body covering an edge of the optical layer; and a side frame extension extended from the side frame body, the side frame extension positioned between the optical layer and the display panel; and a light guide module positioned between the display panel and the side frame extension, the light guide module elongated along the edge of the optical layer, wherein a gap is formed between the light guide module and the display panel.