Patent ID: 8184211

Claim:
A quasi analog knob control method of controlling a function status of a display device by imitating the rotation of an analog knob, the control method comprising the steps of: providing at least two reference points for generating light of a predetermined spectrum and defining a predetermined area surrounding the reference points; providing an image sensor to point inside the predetermined area; receiving the light of the predetermined spectrum by the image sensor to form a digital image; identifying image positions of the reference points on the digital image and obtaining a first parameter; rotating the image sensor for imitating the rotation of the analog knob and obtaining a second parameter; and calculating a rotation angle difference between the first and the second parameters and calculating a step by dividing the rotation angle difference by a step parameter, which is an identifiable angle of the rotating of the image sensor for defining a varying sensitivity, so as to control the function status of the display device according to the calculated step.