A display device includes a substrate including an active area and a dummy area, and including a plurality of sub-pixels arranged in m rows and n columns, first initialization power lines which provide a first initialization voltage to sub-pixels of the plurality of sub-pixels and extending in a column direction, second initialization power lines which provide a second initialization voltage to sub-pixels of the plurality of sub-pixels and extending in the column direction, and repair lines extending in a row direction. Sub-pixels of the dummy area are arranged in an outermost column of the n columns, the repair lines are arranged so as to connect the sub-pixels of the dummy area and sub-pixels of the active area among the plurality of sub-pixels, respectively, and m and n are natural numbers.