On-screen knob state identification method and on-screen knob

The invention relates to an on-screen knob state recognition method and an on-screen knob, the on-screen knob at least comprises a magnetic ring and a 3D Hall element which are located on the two sides of a screen respectively, the magnetic ring is provided with a plurality of magnetic blocks in sequence in the circumferential direction of the magnetic ring, the polarities of the adjacent magnetic blocks are opposite, and in the reference state of the knob, the 3D Hall element is located on the 3D Hall element. The 3D Hall element corresponds to the central position between any adjacent magnetic blocks. The method comprises the following steps: acquiring the magnetic field direction and the magnetic field intensity in the knob operation process through the 3D Hall element; the knob state is determined according to the magnetic field direction and the magnetic field intensity, and the knob state at least comprises an intermediate state and a stable state; determining the rotation direction and rotation amount