TOUCH SCREEN SYSTEM WITH ACOUSTIC AND CAPACITIVE SENSING
First Claim
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1. A touch screen system for an electronic device having a power source that provides a first voltage, comprising:
- a transparent substrate for receiving a contact of an object;
one or more acoustic transducers associated with the transparent substrate, wherein the acoustic transducers receive an acoustic wave generated by the contact and convert the acoustic wave to an electronic signal; and
a transparent conductive layer located below the transparent substrate, wherein the transparent conductive layer receives the first voltage from the power source, and wherein the contact of the object causes a capacitive change between the transparent conductive layer and the object.
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Abstract
A touch screen system that can sense when an object is held in continuous direct or indirect contact with a transparent substrate of the touch screen system as well as determine a location (e.g., X, Y coordinates) of the object in relation to the transparent substrate. The touch screen system employs dynamic surface capacitance technology to sense whether the object is held in contact with the transparent substrate and acoustic sensing technology to determine a position of the object that is contacting the transparent substrate.
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Citations
20 Claims
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1. A touch screen system for an electronic device having a power source that provides a first voltage, comprising:
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a transparent substrate for receiving a contact of an object; one or more acoustic transducers associated with the transparent substrate, wherein the acoustic transducers receive an acoustic wave generated by the contact and convert the acoustic wave to an electronic signal; and a transparent conductive layer located below the transparent substrate, wherein the transparent conductive layer receives the first voltage from the power source, and wherein the contact of the object causes a capacitive change between the transparent conductive layer and the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining a presence and a location of an object in relation to a transparent substrate of an electronic device having a power source that provides a stimulus signal, the method comprising:
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receiving, at one or more acoustic sensors associated with the transparent substrate, an acoustic signal, wherein the acoustic signal is generated by a touch of the object in relation to a first side of the transparent substrate; converting, by the acoustic sensors, the acoustic signal to an electronic signal; receiving the stimulus signal at a transparent conductive layer associated with a second side of the transparent substrate, wherein the touch of the object in relation to the first side of the transparent substrate causes a capacitive change between the transparent conductive layer and the object; analyzing, by a microcontroller, the capacitive change to determine whether the object is in contact with the transparent substrate; and analyzing, by the microcontroller, the electronic signal to determine a location of the object relative to the transparent substrate. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for determining a presence and a location of an object in relation to a transparent substrate of an electronic device, the method comprising:
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using one or more acoustic sensors associated with the transparent substrate, detecting an acoustic signal generated by a touch of the object in relation to a first side of the transparent substrate; and using one or more capacitive sensors associated with a transparent conductive layer abutting a second side of the transparent substrate, detecting a capacitive change generated when the object contacts the transparent substrate. - View Dependent Claims (18, 19, 20)
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Specification