Capacitive sensing with interpolating force-sensitive resistor array
First Claim
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1. A device comprising:
- an interpolating force-sensitive resistor array touch sensor comprising two layers, a first layer comprising a column of electrodes and a second layer comprising a row of electrodes and a resistive material filling gaps between the electrodes of the first layer and the electrodes of the second layer to act as a linear resistor, the resistive material having an electrical resistance that varies in relation to a force applied to the resistive material; and
non-transitory computer-readable media storing instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising;
receiving voltage data from a touch controller coupled to the interpolating force-sensitive resistor array touch sensor;
generating a temporal voltage profile based at least in part on the voltage data, the temporal voltage profile indicating a capacitive effect and a resistive effect over time on the interpolating force-sensitive resistor array touch sensor from a touch input; and
analyzing the temporal voltage profile so as to determine that the temporal voltage profile corresponds to at least one of a resistive touch input or a capacitive touch input.
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Abstract
An combination interpolating force sensitive resistor (IFSR) array touch sensor and capacitive touch sensor, or a modified IFSR sensor, is configured to detect touches resistively and capacitvely. By comparing resistive and capacitive signals, touches may be accurately characterized. The IFSR array may also be used in conjunction with an active stylus to determine a position of the active stylus relative to the IFSR array.
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Citations
22 Claims
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1. A device comprising:
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an interpolating force-sensitive resistor array touch sensor comprising two layers, a first layer comprising a column of electrodes and a second layer comprising a row of electrodes and a resistive material filling gaps between the electrodes of the first layer and the electrodes of the second layer to act as a linear resistor, the resistive material having an electrical resistance that varies in relation to a force applied to the resistive material; and non-transitory computer-readable media storing instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising; receiving voltage data from a touch controller coupled to the interpolating force-sensitive resistor array touch sensor; generating a temporal voltage profile based at least in part on the voltage data, the temporal voltage profile indicating a capacitive effect and a resistive effect over time on the interpolating force-sensitive resistor array touch sensor from a touch input; and analyzing the temporal voltage profile so as to determine that the temporal voltage profile corresponds to at least one of a resistive touch input or a capacitive touch input. - View Dependent Claims (2, 3, 22)
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4. A device comprising:
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an interpolating force-sensitive resistor array touch sensor comprising; a first layer comprising a column of electrodes; a second layer comprising a row of electrodes; and a resistive material which fills gaps between the electrodes of the first layer and the electrodes of the second layer and having an electrical resistance that is altered at least in part by a force applied to the resistive material; and non-transitory computer-readable media storing instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising; receiving voltage data from a touch controller coupled to the interpolating force-sensitive resistor array touch sensor; generating a temporal voltage profile based at least in part on the voltage data, the temporal voltage profile indicating a capacitive effect and a resistive effect over time on the interpolating force-sensitive resistor array touch sensor from a touch input; and analyzing the temporal voltage profile so as to determine that the temporal voltage profile corresponds to at least one of a resistive touch input or a capacitive touch input. - View Dependent Claims (5, 6)
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7. A method comprising:
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pulsing a voltage to a first portion of an interpolating force-sensitive resistor array touch sensor comprising a first layer comprising a column of electrodes, a second layer comprising a row of electrodes, and a resistive material which fills gaps between the electrodes of the first layer and the electrodes of the second layer and having an electrical resistance that varies based at least in part on a pressure applied to the resistive material; measuring a voltage generated by a signal associated with a touch over time at a second portion of the force-sensitive resistor array; generating a temporal voltage profile from the measured voltage over time, wherein the temporal voltage profile comprises capacitive effects between the electrodes of the first layer and the electrodes of the second layer and resistive effects between the electrodes of the first layer and the electrodes of the second layer; and analyzing the temporal voltage profile so as to determine that the temporal voltage profile corresponds to at least one of a resistive touch input or a capacitive touch input. - View Dependent Claims (8)
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9. A device comprising:
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an interpolating force-sensitive resistor array touch sensor comprising a first layer comprising a column of electrodes, a second layer comprising a row of electrodes, and a resistive material which fills gaps between the electrodes of the first layer and the electrodes of the second layer and having an electrical resistance that changes based at least in part on a pressure applied to the resistive material; and non-transitory computer-readable media storing instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising; receiving voltage data from a touch controller coupled to the interpolating force-sensitive resistor array touch sensor; generating a temporal voltage profile based at least in part on the voltage data, the temporal voltage profile indicating a capacitive effect and a resistive effect over time on the interpolating force-sensitive resistor array touch sensor from a touch input; and analyzing the temporal voltage profile so as to determine that the temporal voltage profile corresponds to at least one of a resistive touch input or a capacitive touch input. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A device comprising:
a composite touch sensor comprising; a capacitive touch sensor; an interpolating force-sensitive resistor array touch sensor disposed adjacent to and coincident with the capacitive touch sensor, the interpolating force-sensitive resistor array touch sensor comprising a first layer comprising a column of electrodes, a second layer comprising a row of electrodes, and a third layer between the electrodes of the first layer and second layer including a resistive material filling gaps between the electrodes of the first layer and the electrodes of the second layer and having an electrical resistance that is altered at least by changes in a force applied to the resistive material; and non-transitory computer-readable media storing instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising; receiving voltage data from a touch controller coupled to the interpolating force-sensitive resistor array touch sensor; generating a temporal voltage profile based at least in part on the voltage data, the temporal voltage profile indicating a capacitive effect and a resistive effect over time on the interpolating force-sensitive resistor array touch sensor from a touch input; and analyzing the temporal voltage profile so as to determine that the temporal voltage profile corresponds to at least one of a resistive touch input or a capacitive touch input. - View Dependent Claims (16, 17)
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18. A method comprising:
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receiving a first input from an interpolating force-sensitive resistor array touch sensor comprising a first layer comprising a column of electrodes, a second layer comprising a row of electrodes and a third layer between the electrodes of the first layer and the second layer including a resistive material filling gaps between the electrodes of the first layer and the electrodes of the second layer and having an electrical resistance that varies in relation to an amount of pressure applied to the resistive material, the first input representing resistive effects detected by the interpolating force-sensitive resistor array touch sensor; receiving a second input from a capacitive touch sensor disposed adjacent to the interpolating force-sensitive resistor array touch sensor, the second input representing capacitive effects detected by the capacitive touch sensor; generating a temporal voltage profile based at least in part on the first input and the second input, the temporal voltage profile indicating the capacitive effects and resistive effects over time; and analyzing the temporal voltage profile so as to determine that the temporal voltage profile corresponds to at least one of a resistive touch input or a capacitive touch input. - View Dependent Claims (19, 20, 21)
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Specification