Capacitive scan method without display flicker

A method for operating a touch sensing panel includes a touchscreen controller determining a first plurality of excitation signals in accordance with a first plurality of codes, wherein a sum of the first plurality of codes is a sequence of numbers having a same absolute value and signs alternating between adjacent numbers in the sequence of numbers. The method further includes the touchscreen controller transmitting each of the first plurality of excitation signals to a respective transmitting (TX) touch sensor of the touch sensing panel simultaneously during a first time frame. The method further includes the touchscreen controller determining touch strengths in accordance with a first plurality of output signals received by a plurality of receiving (RX) touch sensors of the touch sensing panel during the first time frame.