A display device (R12a, R12b), comprising: a backlight module, comprising: a reflector; and a light guide plate disposed on the reflector, wherein the light guide plate has a first side, a second side and a third side, the second side is opposite to the first side, and the third side adjoins the first side and the second side, wherein the reflector is disposed close to the second side; a display panel disposed close to the first side of the light guide plate, wherein the display panel comprises a display area, at least a portion of the light guide plate overlaps the display area; a decorating element disposed close to the third side and has a top flange portion and a bottom flange portion, wherein at least a portion of the decorating element is disposed between the display panel and the light guide plate, the bottom flange portion is in direct contact with the second side, the decorating element contacts the third side of the light guide plate, the bottom flange portion does not contact the first side of the light guide plate, and the decorating element is a set frame which functions as an appearance element; a decorative layer, wherein the bottom flange portion extends between the light guide plate and the decorative layer; a set of optical films disposed on the first side of the light guide plate, wherein the top flange portion extends inwardly between the set of optical films and the display panel and directly contacts the top surface of the set of optical films; a light source; a printed circuit board, wherein the light source and the printed circuit board are disposed besides the light guide plate, the set of optical films, the light source, the printed circuit board, and the display panel are enclosed by the decorating element; and an adhesive gel, wherein the light guide plate and the reflector on the decorative layer are bonded through the adhesive gel. a backlight module, comprising: a reflector; and a light guide plate disposed on the reflector, wherein the light guide plate has a first side, a second side and a third side, the second side is opposite to the first side, and the third side adjoins the first side and the second side, wherein the reflector is disposed close to the second side; a reflector; and a light guide plate disposed on the reflector, wherein the light guide plate has a first side, a second side and a third side, the second side is opposite to the first side, and the third side adjoins the first side and the second side, wherein the reflector is disposed close to the second side; a display panel disposed close to the first side of the light guide plate, wherein the display panel comprises a display area, at least a portion of the light guide plate overlaps the display area; a decorating element disposed close to the third side and has a top flange portion and a bottom flange portion, wherein at least a portion of the decorating element is disposed between the display panel and the light guide plate, the bottom flange portion is in direct contact with the second side, the decorating element contacts the third side of the light guide plate, the bottom flange portion does not contact the first side of the light guide plate, and the decorating element is a set frame which functions as an appearance element; a decorative layer, wherein the bottom flange portion extends between the light guide plate and the decorative layer; a set of optical films disposed on the first side of the light guide plate, wherein the top flange portion extends inwardly between the set of optical films and the display panel and directly contacts the top surface of the set of optical films; a light source; a printed circuit board, wherein the light source and the printed circuit board are disposed besides the light guide plate, the set of optical films, the light source, the printed circuit board, and the display panel are enclosed by the decorating element; and an adhesive gel, wherein the light guide plate and the reflector on the decorative layer are bonded through the adhesive gel.