Display device

A display device, comprising:

• a touch display panel comprising a plurality of touch sensing units and a plurality of pixel units, wherein the pixel units are configured to form a display image;
• and
• a knob disposed on the touch display panel and comprising:
• a housing;
• a conductive contact pad disposed on a bottommost surface of the housing that is adjacent to the touch display panel and in contact with the touch display panel, wherein a portion of the conductive contact pad is embedded in a groove of the housing;
• a conductive ring disposed on an outermost edge of the bottommost surface of the housing, wherein:
• when the housing is not pressed, the conductive ring is separated from the touch display panel, and
• when the housing is pressed, the conductive ring is in contact with the touch display panel, wherein under a first condition, when the housing is pressed, the conductive ring is tilted relative to the touch display panel and forms a point contact with the touch display panel;
• and
• a spring structure disposed laterally between the conductive ring and the conductive contact pad in a cross-sectional view such that under the first condition, the conductive contact pad remains in contact with the touch display panel.