Display noise compensation in touch screen display using capacitive dividers

A method of operating a touch sensing device having a display layer, a common voltage layer, and a sensing layer, the method comprising:

• generating display noise by scanning the display layer;
• capacitively coupling the display noise from the display layer to the common voltage layer via at least one parasitic impedance;
• capacitively coupling the display noise from the common voltage layer to the each of a plurality of sense lines in the sensing layer via a different parasitic impedance;
• and
• compensating for different amplitudes of the display noise and for the different parasitic impedances by directly electrically connecting each compensation impedance of a plurality of compensation impedances equal in number to the plurality of sense lines between a different one of the plurality of sense lines and ground in an unbroken fashion during operation of the touch sensing device and such that each sense line is directly electrically connected to one of the plurality of compensation impedances in an unbroken fashion during operation of the touch sensing device, wherein each of the compensation impedances has an impedance value such that an amplitude of the display noise at an output of each sense line is substantially equal.

An electronic device, comprising:

• a display layer generating display noise based on scanning thereof;
• a sensing layer including a plurality of sense lines;
• a common voltage layer coupled to the display layer and the sensing layer, the common voltage layer capacitively coupling the display noise from the display layer to the each of the plurality of sense lines of the sensing layer via a different parasitic impedance;
• and
• a plurality of compensation impedances, each compensation impedance being directly electrically connected to a different one of the plurality of sense lines in an unbroken fashion during operation of the electronic device, wherein each of the plurality of compensation impedances has an impedance value such that an amplitude of the display noise at an output of each sense line is substantially equal;
• wherein the plurality of compensation impedances and the plurality of sense lines are equal in number.