A display device comprising: a first substrate having a rounded corner portion; a second substrate having a rounded corner portion; a plurality of data drivers on a first edge of the first substrate, the plurality of data drivers comprising a data driving IC and a data flexible circuit film on which the data driving IC is mounted; a plurality of data pad parts disposed on the first edge of the first substrate and connected to each of the plurality of data drivers; a plurality of gate drivers on a second edge of the first substrate; a plurality of gate pad parts disposed on the second edge of the first substrate and connected to each of the plurality of gate drivers; a gate control signal pad part (GCPP) on the second edge of the first substrate; an assistant flexible circuit film directly physically coupled to the gate control signal pad part (GCPP), and supplying a gate control signal to the gate control signal pad part (GCPP), wherein the assistant flexible circuit film and the data flexible circuit films are bent without protruding to outside a side surface of the first substrate; a printed circuit board electrically connected to the bent data flexible circuit films by a tape automated bonding process, and electrically connected to the bent assistant flexible circuit film by a connector mounted on the printed circuit board; and a gate control signal link line (GCLL) disposed on the second edge of the first substrate supplying the gate control signal supplied from the gate control signal pad part (GCPP) to the plurality of gate drivers, wherein the corners of the rounded corner portions (RP1, RP3) of the first and second substrates (112, 114) are rounded with parallel curvatures and are nonoverlapping, wherein the gate control signal link line (GCLL) is not connected to any of the data flexible circuit films, and does not pass through the corners of the rounded corner portions (RP1, RP3) of the first and second substrates (112, 114). a first substrate having a rounded corner portion; a second substrate having a rounded corner portion; a plurality of data drivers on a first edge of the first substrate, the plurality of data drivers comprising a data driving IC and a data flexible circuit film on which the data driving IC is mounted; a plurality of data pad parts disposed on the first edge of the first substrate and connected to each of the plurality of data drivers; a plurality of gate drivers on a second edge of the first substrate; a plurality of gate pad parts disposed on the second edge of the first substrate and connected to each of the plurality of gate drivers; a gate control signal pad part (GCPP) on the second edge of the first substrate; an assistant flexible circuit film directly physically coupled to the gate control signal pad part (GCPP), and supplying a gate control signal to the gate control signal pad part (GCPP), wherein the assistant flexible circuit film and the data flexible circuit films are bent without protruding to outside a side surface of the first substrate; a printed circuit board electrically connected to the bent data flexible circuit films by a tape automated bonding process, and electrically connected to the bent assistant flexible circuit film by a connector mounted on the printed circuit board; and a gate control signal link line (GCLL) disposed on the second edge of the first substrate supplying the gate control signal supplied from the gate control signal pad part (GCPP) to the plurality of gate drivers, wherein the corners of the rounded corner portions (RP1, RP3) of the first and second substrates (112, 114) are rounded with parallel curvatures and are nonoverlapping, wherein the gate control signal link line (GCLL) is not connected to any of the data flexible circuit films, and does not pass through the corners of the rounded corner portions (RP1, RP3) of the first and second substrates (112, 114).