Calibration for pressure effects on touch sensor panels
First Claim
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1. A non-transitory computer readable storage medium having stored thereon a set of instructions for controlling a touch sensor panel comprising a plurality of touch nodes of the touch sensor panel sharing a common local oscillator, that when executed by a processor causes the processor to:
- generate one or more stimulation signals to stimulate one or more drive lines by a drive circuitry;
operate a control logic for controlling a sense circuitry;
capture one or more first output values from one or more sense channels of the sense circuitry while the touch sensor panel is in a compressed state,wherein the touch sensor panel includes a gap at least partially between a touch sensor stackup and a display stackup, the gap capable of being compressed when pressure is applied to the touch sensor panel such that at least one portion of the display stackup and at least one portion of the touch sensor stackup are closer together in the compressed state than in a non-compressed state;
capture one or more second output values from the one or more sense channels of the sense circuitry while the touch sensor panel is in the non-compressed state; and
configure the drive circuitry, the sense circuitry, or both to reduce a difference between the one or more first output values and the one or more second output values by setting the variable phase, frequency, or both of the common local oscillator to a value based on the one or more first output signal values and the one or more second output signal values associated with respective nodes of the plurality of touch nodes sharing the common local oscillator, the one or more first output values and the one or more second output values indicative of a substantially equivalent touch or no-touch input condition of the touch sensor panel, the touch or no-touch input condition associated with a proximity of a conductive object to the touch sensor panel.
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Abstract
A touch sensor panel which has been calibrated to be insensitive to effects from an external force applied to the panel is provided. Touch sense circuitry settings are adjusted during a calibration procedure so that when a force is exerted on the device, no change in the touch signal DC level is seen. In this way, the ability of the touch sensor panel to detect touch or proximity events is not affected by a force being applied to the panel.
29 Citations
26 Claims
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1. A non-transitory computer readable storage medium having stored thereon a set of instructions for controlling a touch sensor panel comprising a plurality of touch nodes of the touch sensor panel sharing a common local oscillator, that when executed by a processor causes the processor to:
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generate one or more stimulation signals to stimulate one or more drive lines by a drive circuitry; operate a control logic for controlling a sense circuitry; capture one or more first output values from one or more sense channels of the sense circuitry while the touch sensor panel is in a compressed state, wherein the touch sensor panel includes a gap at least partially between a touch sensor stackup and a display stackup, the gap capable of being compressed when pressure is applied to the touch sensor panel such that at least one portion of the display stackup and at least one portion of the touch sensor stackup are closer together in the compressed state than in a non-compressed state; capture one or more second output values from the one or more sense channels of the sense circuitry while the touch sensor panel is in the non-compressed state; and configure the drive circuitry, the sense circuitry, or both to reduce a difference between the one or more first output values and the one or more second output values by setting the variable phase, frequency, or both of the common local oscillator to a value based on the one or more first output signal values and the one or more second output signal values associated with respective nodes of the plurality of touch nodes sharing the common local oscillator, the one or more first output values and the one or more second output values indicative of a substantially equivalent touch or no-touch input condition of the touch sensor panel, the touch or no-touch input condition associated with a proximity of a conductive object to the touch sensor panel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A touch sensor panel having a compressed state and a non-compressed state comprising:
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a touch sensor stackup comprising; a plurality of touch nodes; drive circuitry for providing one or more stimulation signals to one or more drive lines; and sense circuitry comprising a common local oscillator having a variable phase, frequency, or both, wherein the common local oscillator is common to the plurality of touch nodes, the sense circuitry configured for; determining one or more output signal values indicative of a touch or no-touch input condition on the touch sensor stackup, determining one or more first output signal values in the compressed state, and determining one or more second output signal values in the non-compressed state, the one or more second output signal values indicative of a substantially equivalent touch or no-touch input condition as the one or more first output signal values, the touch or no-touch input condition associated with a proximity of a conductive object to the touch sensor panel, wherein the drive circuitry, the sense circuitry, or both are configured to reduce a difference between the one or more first output signal values and the one or more second output signal values by setting the variable phase, frequency or both of the common local oscillator to a value based on the one or more first output signal values and the one or more second output signal values associated with respective nodes of the plurality of touch nodes sharing the common local oscillator; a display stackup; and an adhesive layer for attaching the touch sensor stackup and the display stackup, wherein a gap is formed at least partially between the display stackup and the touch sensor stackup, the gap capable of being compressed when pressure is applied to the touch sensor panel such that at least one portion of the display stackup and at least one portion of the touch sensor stackup are closer together in the compressed state than in the non-compressed state. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification