Hovering and touch sensing apparatus

A hovering and touch sensing apparatus, comprising

• a touch sensing electrode matrix comprising a plurality of touch sensing electrodes, a system circuit and a touch control circuit;
• the system circuit comprising:
• a system power source;
• a system ground;
• a first specific conductor with area larger than any area of the touch sensing electrodes, the first specific conductor electrically connected to the system power source and the system ground;
• the touch control circuit comprising:
• a touch control power source;
• a touch control ground;
• a capacitance-exciting signal source;
• a capacitance-exciting signal driver circuit;
• and at least one capacitance-sensing signal receiving circuit, wherein the touch control power source is electrically connected to the touch control ground and supplies electric power to the capacitance-exciting signal source, the capacitance-exciting signal driver circuit, and the at least one capacitance-sensing signal receiving circuit,
• wherein when an operation object approaches or touches the plurality of touch sensing electrodes for hovering or touch sensing operation, there is no common current loop between the system power source and the touch control power source;
• the capacitance-exciting signal source generates an alternating signal;
• the capacitance-exciting signal driver circuit processes the alternating signal and then electrically coupled the processed alternating signal to the first specific conductor,
• wherein a first capacitor is formed between the operation object and the first specific conductor, a second capacitor is formed between the operation object and the respective one of the touch sensing electrodes, the at least one capacitance-sensing signal receiving circuit receives a touch sensing signal from a selected touch sensing electrode.