Knob and related sensing circuit

Abstract

A knob is disposed on a touch panel including a first touch sensor, a second touch sensor and a third touch sensor. The knob includes a bottom surface and a first connector. The bottom surface includes a sensing electrode aligned with the first touch sensor, a first common electrode aligned with the second touch sensor and receiving a first reference voltage from the second touch sensor, and a second common electrode aligned with the third touch sensor and receiving a second reference voltage from the third touch sensor. The first connector controls the sensing electrode to be conducted with the first common electrode and the second common electrode or not when the knob rotates. A touch sensing circuit of the touch panel determines a rotation direction of the knob according to a signal variation of the first touch sensor.

Dependencies are inferred from the claim text.