A dial structure, a remote controller employing the dial structure, and a controlling method are provided. The dial structure comprises a carrying member and a dial movably connected with the carrying member. The dial is slidable with respect to the dial structure along a sliding direction and rotatable around a rotation shaft. An axial direction of the rotation shaft intersects with the sliding direction. The dial structure further comprises a rotation sensor configured to obtain rotating state information of the dial and a sliding sensor configured to obtain sliding state information of the dial.

Knob on display (KoD) devices and related systems, methods, and devices are disclosed. A KoD device includes at least one electrode including an electrically conductive material. The KoD device also includes a base assembly configured to be positioned between a touch screen of a touch screen device and the at least one electrode. The at least one electrode is configured to be positioned in engagement proximity to a touch sensor of the touch screen device through the base assembly.

A controlling method for an unmanned aerial vehicle (UAV) that includes an image device. The controlling method includes transmitting, by a remote controller when a dial of a dial structure of the remote controller is rotated, a first control signal for changing imaging device information of an imaging device of the UAV via a signal transmitting device of the remote controller. The imaging device information comprises at least one of an operating mode of the imaging device, a shutter speed of the imaging device, an aperture size of the imaging device, a light sensitivity of the imaging device, or a preview image of the imaging device. The controlling method further includes transmitting a second control signal for confirming imaging device information via the signal transmitting device by the controller when the dial is slid with a displacement.