Dynamic corrections for a non-linear touchscreen

A touchscreen system for generating signals representing a touch position comprising:

• a substrate having four corners and a corner contact at each corner;
• a digitizing circuit in communication with each corner contact, wherein the digitizing circuit measures an electrical characteristic of one contact and generates measurable information based upon the electrical characteristic;
• and
• a correction-parameter circuit in communication with the digitizing circuit, wherein the correction-parameter circuit generates a non-linear correction parameter.

A method for correcting non-linearities in a touchscreen, wherein the touchscreen includes a first point spaced apart from a second point, the method comprising:

• measuring an electrical characteristic of the first point while applying one of a voltage or current to the second point;
• generating measurable information based upon the electrical characteristic;
• and
• correcting for non-linearity in the touchscreen system using the measurable information.

A touchscreen system for generating signals representing a touch position comprising:

• a substrate including a first contact spaced apart from a second contact and a first coating overlying the substrate and in communication with the first and second contacts;
• a sheet spaced from the substrate, wherein the sheet includes a second coating facing the first coating, wherein the sheet is movable from a first position, in which the second coating is not in contact with the first coating, to a second position, in which the second coating is in contact with the first coating;
• a digitizing circuit in communication with both the first and the second contacts, wherein the digitizing circuit receives first analog measurable information and generates digital measurable information in response, and wherein the digitizing circuit receives the analog measurable information when the sheet is in the first position;
• a correction-parameter circuit in communication with the digitizing circuit, wherein the correction-parameter circuit receives the digital measurable information and generates a correction parameter based upon the digital measurable information;
• and
• a correction-application circuit in communication with the digitizing circuit and the correction-parameter circuit, wherein the correction-application circuit receives the correction parameter and corrects for non-linearity in the touchscreen system using the correction parameter.

A method for correcting non-linearities in a touchscreen, wherein the touchscreen comprises a substrate and a sheet spaced from the substrate, the substrate including a first contact spaced apart from a second contact and a first coating overlying the substrate and in communication with the first and second contacts, the sheet including a second coating facing the first coating, wherein the sheet is movable from a first position, in which the second coating is not in contact with the first coating, to a second position, in which the second coating is in contact with the first coating, the method comprising:

• measuring an electrical characteristic of the first contact, while applying one of a voltage or current to the second contact, when the sheet is in the first position;
• generating measurable information based upon the electrical characteristic to the measuring;
• and
• correcting for a non-linearity in the touchscreen system using the measurable information.

A touchscreen system for generating signals representing a touch position comprising:

• a touchscreen;
• a digitizing circuit in communication with the touchscreen, wherein the digitizing circuit receives analog measurable information and generates digital measurable information in response;
• and
• a correction-parameter circuit in communication with the digitizing circuit, wherein the correction-parameter circuit corrects for a non-linearity in the touchscreen using the digital measurable information.