Shift register unit, driving method, grid driving circuit and display device thereof

The embodiment of the invention provides a shift register unit, a driving method, a grid driving circuit and a display device of the shift register unit, which relate to the technical field of display and are used for solving the problems that the cost is increased and the design of a narrow bezel is not facilitated because a binding process is adopted in an OLED (Organic Light Emitting Diode) display device. The shift register unit comprises a reset signal subunit and a scanning signal subunit, wherein the reset signal subunit comprises a first input module, a first output module and a first control module; the scanning signal subunit comprises a second input module, a second output module and a second control module; the first input module is connected with the first control module, the first output module and a signal input end; both the first output module and the first control module are connected with the scanning signal subunit and a reset signal end; the second input module is further connected with the second output module and the second control module; both the second output module and the second control module are connected with a signal output end. The shift register unit is used for manufacturing displays.