Multiple stimulation phase determination
First 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.
2 Assignments
0 Petitions
Accused Products
Abstract
Determination of phases of multiple stimulation signals to be simultaneously applied to a touch sensor panel is disclosed. A matrix may be determined that is invertible and has a gain greater than one, where each row of the matrix may represent a single step among multiple steps needed to compute values for generating an image of touch, each column of the matrix may represent a drive line of the touch sensor panel to be stimulated, and each element of the matrix may represent the phase of the stimulation signal to be applied to a particular drive line in a particular step. For each step, stimulation signals having phases in accordance with the matrix elements may be simultaneously applied to the drive lines of the touch sensor panel.
-
Citations
17 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. In a system including a two-dimensional sensor panel having a plurality of drive lines, the plurality of drive lines including a first plurality of drive lines, being simultaneously driven with a plurality of stimulation signals having positive and negative phases in a particular distribution and a plurality of sense lines responding to the simultaneously driven stimulation signals, a method for determining the phases of the stimulation signals to be simultaneously applied to drive lines of a two-dimensional touch sensor panel, the method 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; for each step in the plurality of steps, 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 vales 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 sensor panel, each sensor measuring the capacitance formed between one of the plurality of first drive lines and one of the plurality of sense lines, to generate a two-dimensional image of touch from the response detected from the sense lines of the two-dimensional sensor panel for each step of the plurality of steps, wherein the generated values are based on the first and second sense line values of each sense line. - View Dependent Claims (12, 13, 14)
-
15. A sensing device, comprising:
-
a two-dimensional sensor panel comprising a plurality of sensors, each sensor formed from capacitive coupling between one of a plurality of drive lines, the plurality of drive lines including a first plurality of drive lines, and one of a plurality of sense lines; and an integrated circuit coupled to the two-dimensional sensor panel, including driver logic configured to generate a plurality of stimulation signals to simultaneous stimulate the first plurality of drive lines, the stimulation signals having phases in accordance instructions stored in a memory, the instructions arranged to represent a plurality of parameters, each parameter, each parameter representing the 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; a plurality of sense channels configured to receive a plurality of responses from the plurality of sense lines to the applied stimulation signals; wherein the integrated circuit is capable of; 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; 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. - View Dependent Claims (16, 17)
-
Specification