A driver circuit, a touch display device, and a method of driving the touch display device. Touching force is sensed by driving a plurality of first electrodes disposed in a display panel and a second electrode located outside of the display panel. The first electrodes corresponding to force sensors for sensing the touching force and the second electrode are driven by alternating in-phase driving and antiphase driving. Touching force components are selectively and accurately extracted from sensing data, and the touching force can be accurately sensed.