Patent ID: 9606663
Date: 2017-03-28
CPC Classifications: G06F

Claim:
1. A method for determining phases of stimulation signals to be simultaneously applied to a plurality of drive lines of a two-dimensional touch sensor panel, the plurality of drive lines including a first plurality of drive lines, the two-dimensional touch sensor panel comprising a plurality of sensors, each sensor formed from capacitive coupling between one of the plurality of drive lines and one of a plurality of sense lines, to generate a two-dimensional image of touch, comprising: accessing a memory, the memory storing instructions that contain a plurality of steps to compute values for generating signals to stimulate the first plurality of drive lines, each step of the instructions having a plurality of parameters, each parameter representing a phase of the stimulation signal to be applied to a particular drive line in a particular step, wherein the plurality of steps includes a first and second step; simultaneously stimulating the first plurality of drive lines with the stimulation signals, the stimulation signals having phases in accordance with the plurality of parameters in the first step; determining a first sense line value for each sense line of the plurality of sense line, wherein the first sense line values are based on the stimulation signals having phases in accordance with the plurality of parameters corresponding to the first step; maintaining the stimulation of the first plurality of drive lines with the stimulation signals, wherein the phase of the stimulation signals are set in accordance with the plurality of parameters corresponding to the second step; determining a second sense line value for each sense line of the plurality of sense lines, wherein the second sense line values are based on the stimulation signals having phases in accordance with the plurality of parameters in the second step; and generating a value corresponding to a capacitance at each sensor of the two-dimensional touch sensor panel to generate the two-dimensional image of touch from response signals received from the plurality of sense lines of the two-dimensional touch sensor panel during the plurality of steps in response to the stimulation signals, each sensor of the two-dimensional touch sensor panel measuring the capacitance between a drive line and a sense line, wherein the generated values are based on the first and second sense line values of each sense line.