There is provided a column repair technology of a semiconductor memory device. The backlight assembly comprises a reflector on a bottom cover, a set of optical sheets supported by the bottom cover, stoppers on opposite edges of the bottom cover to prevent movement of the optical sheet set, and supports extending from the reflector at least partially contacting inner sides of the first stoppers. Furthermore, the FFL may include joint electrodes which electrically couple the branch electrodes, provided around each of the opposite ends of the lamp body, to each other. The term-to-concept vector describes a relationship between the term and each of the concept vectors.