A gate driver (100, 520), comprising: a plurality of shift registers (120, SR) connected to a plurality of gate lines of a display panel, respectively, the shift registers (120, SR) being grouped into a plurality of shift register groups (160, GP), N adjacent shift registers (120, SR) constituting each of the shift register groups (160, GP), the shift register groups (160, GP) being connected in a cascade form, where N is an integer greater than or equal to 2; and a plurality of connection controllers configured to change a connection structure of the N adjacent shift registers (120, SR) included in the each of the shift register groups (160, GP), wherein the connection controllers are configured to connect the N adjacent shift registers (120, SR) included in the (k)th shift register group (160, GP) in a cascade form when a panel region connected to the (k)th shift register group (160, GP) is stretched, where k is an integer greater than or equal to 1, wherein the N adjacent shift registers (120, SR) included in the (k)th shift register group (160, GP) are configured to sequentially output a gate signal via the gate lines when the panel region connected to the (k)th shift register group (160, GP) is stretched. wherein the connection controllers are configured to connect the N adjacent shift registers (120, SR) included in the (k)th shift register group (160, GP) in a parallel form when the panel region connected to the (k)th shift register group (160, GP) is not stretched, and wherein the N adjacent shift registers (120, SR) included in the (k)th shift register group (160, GP) are configured to simultaneously output the gate signal via the gate lines when the panel region connected to the (k)th shift register group (160, GP) is not stretched, wherein the display panel is stretchable and the connection structure of the N adjacent shift registers (120, SR) included in the each of the shift register groups (160, GP) is configured to be changed according to whether the stretchable display panel is stretched, and when the stretchable display panel is stretched in a direction in which the gate lines extend, the gate lines have a spring structure in order that the gate lines and the gate driver (100, 520) are stretched as the stretchable display panel is stretched, and the gate driver (100, 520) provides the gate signal to the stretchable display panel via the gate lines. a plurality of shift registers (120, SR) connected to a plurality of gate lines of a display panel, respectively, the shift registers (120, SR) being grouped into a plurality of shift register groups (160, GP), N adjacent shift registers (120, SR) constituting each of the shift register groups (160, GP), the shift register groups (160, GP) being connected in a cascade form, where N is an integer greater than or equal to 2; and a plurality of connection controllers configured to change a connection structure of the N adjacent shift registers (120, SR) included in the each of the shift register groups (160, GP), wherein the connection controllers are configured to connect the N adjacent shift registers (120, SR) included in the (k)th shift register group (160, GP) in a cascade form when a panel region connected to the (k)th shift register group (160, GP) is stretched, where k is an integer greater than or equal to 1, wherein the N adjacent shift registers (120, SR) included in the (k)th shift register group (160, GP) are configured to sequentially output a gate signal via the gate lines when the panel region connected to the (k)th shift register group (160, GP) is stretched. wherein the connection controllers are configured to connect the N adjacent shift registers (120, SR) included in the (k)th shift register group (160, GP) in a parallel form when the panel region connected to the (k)th shift register group (160, GP) is not stretched, and wherein the N adjacent shift registers (120, SR) included in the (k)th shift register group (160, GP) are configured to simultaneously output the gate signal via the gate lines when the panel region connected to the (k)th shift register group (160, GP) is not stretched, wherein the display panel is stretchable and the connection structure of the N adjacent shift registers (120, SR) included in the each of the shift register groups (160, GP) is configured to be changed according to whether the stretchable display panel is stretched, and when the stretchable display panel is stretched in a direction in which the gate lines extend, the gate lines have a spring structure in order that the gate lines and the gate driver (100, 520) are stretched as the stretchable display panel is stretched, and the gate driver (100, 520) provides the gate signal to the stretchable display panel via the gate lines.