Object positioning for an X-Y projected capacitive touch panel

A method for object positioning for an X-Y projected capacitive touch panel including a first trace and a second trace with a first intersection, the method comprising the steps of:

• (a) in a first state, supplying two excitation signals with a same phase respectively to the first and second traces simultaneously and then sensing the first trace to obtain a first measured capacitance;
• (b) setting a base value according to the first measured capacitance;
• (c) in a second state, supplying two excitation signals with a same phase respectively to the first and second traces simultaneously and then sensing the first trace to obtain a second measured capacitance;
• and
• (d) comparing the base value with the second measured capacitance respectively, to identify a touch;
• wherein the X-Y projected capacitive touch panel is not touched in the first state and is touched in the second state;
• wherein the X-Y projected capacitive touch panel further includes a third trace and a second intersection between the first and third traces, wherein the third trace is parallel with the second trace;
• the step (c) further comprising:
• supplying two excitation signals with a same phase respectively to the first trace and third trace simultaneously and then sensing the first trace to obtain a third measured capacitance;
• and
• wherein step (d) comprises:
• comparing the base value with the second and third measured capacitances respectively, to identify the touch;
• concluding that the first intersection is touched if the second measured capacitance is greater than the base value;
• concluding that the second intersection is touched if the third measured capacitance is greater than the base value;
• and
• concluding that the first and second intersections are touched if both the second and third measured capacitances are greater than the base value.