A display device includes a first substrate including a display area and a non-display area which is outside the display area; a first gate signal line and a second gate signal line each on the non-display area of the first substrate; a connection electrode which is on the non-display area of the first substrate and connects the first gate signal line and the second gate signal line to each other; and a static electricity prevention pattern which is on the non-display area of the first substrate and on the connection electrode.