Dynamic corrections for a non-linear touchscreen
First Claim
1. A touchscreen system for generating touch coordinates comprising:
- a touchscreen which generates touch information in response to a touch and generates measurable information indicative of a given electrical characteristic in the touchscreen;
a correction-parameter circuit in communication with the touchscreen, wherein the correction-parameter circuit receives the measurable information and generates a non-linear correction parameter; and
a correction-application circuit in communication with the touchscreen and the correction-parameter circuit, wherein the correction-application circuit receives the touch information and the non-linear correction parameter and corrects for non-linearity in the touchscreen.
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Accused Products
Abstract
The present invention provides a way to measure and track non-linear corrections in touchscreens. Some or all of the relevant non-linear corrections may be determined automatically. Production floor test equipment may make electronic measurements, compute parameters, and load the parameters in non-volatile memory of the controller electronics. Alternatively, the controller electronics can make the electronic measurements and determine non-linear parameters. The latter embodiment of the invention permits the determination of non-linear parameters in the field, dynamically tracking changes in the non-linear characteristics of installed touchscreens that occur over time or due to environmental conditions.
107 Citations
33 Claims
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1. A touchscreen system for generating touch coordinates comprising:
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a touchscreen which generates touch information in response to a touch and generates measurable information indicative of a given electrical characteristic in the touchscreen;
a correction-parameter circuit in communication with the touchscreen, wherein the correction-parameter circuit receives the measurable information and generates a non-linear correction parameter; and
a correction-application circuit in communication with the touchscreen and the correction-parameter circuit, wherein the correction-application circuit receives the touch information and the non-linear correction parameter and corrects for non-linearity in the touchscreen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A touchscreen system for generating signals representing a touch position comprising:
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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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. 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:
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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. - View Dependent Claims (20, 21, 22, 23)
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24. A touchscreen system for generating signals representing a touch position comprising:
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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. - View Dependent Claims (25, 26)
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27. 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:
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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. - View Dependent Claims (28)
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29. A touchscreen system for generating signals representing a touch position comprising:
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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.
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30. A method for correcting non-linearities in a touchscreen, the method comprising:
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measuring an electrical characteristic of the touchscreen, wherein the electrical characteristic has a value; and
correcting for a non-linearity in the touchscreen system using the value for the electrical characteristic. - View Dependent Claims (31, 32, 33)
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Specification