Wide dynamic range capacitive sensing
First Claim
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1. A method for determining an object sensing mode of a touch sensor panel, comprising:
- at an electronic device with one or more processors and memory,operating the touch sensor panel in a first object sensing mode having a first resolution and a first gain,if no first touch or proximity event is detected in the first object sensing mode, switching the touch sensor panel to operate in a second object sensing mode having a second resolution and a second gain greater than the first gain, andif no second touch or proximity event is detected in the second object sensing mode and the second gain is not a maximum gain, switching the touch sensor panel to operate in the second object sensing mode having a third gain greater than the second gain.
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Abstract
A touch sensor panel configured to detect objects touching the panel as well as objects that are at a varying proximity to the touch sensor panel. The touch sensor panel includes circuitry that can configure the panel in a mutual capacitance (near field) architecture or a self-capacitance (far field and super far field) architecture. The touch sensor panel can also include circuitry that works to minimize an effect that a parasitic capacitance can have on the ability of the touch sensor panel to reliably detect touch and proximity events.
116 Citations
21 Claims
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1. A method for determining an object sensing mode of a touch sensor panel, comprising:
at an electronic device with one or more processors and memory, operating the touch sensor panel in a first object sensing mode having a first resolution and a first gain, if no first touch or proximity event is detected in the first object sensing mode, switching the touch sensor panel to operate in a second object sensing mode having a second resolution and a second gain greater than the first gain, and if no second touch or proximity event is detected in the second object sensing mode and the second gain is not a maximum gain, switching the touch sensor panel to operate in the second object sensing mode having a third gain greater than the second gain. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for determining an object sensing mode of a touch sensor panel, comprising:
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switching circuitry configured to switch the touch sensor panel between a plurality of object sensing modes; and a processor communicatively coupled to the switching circuitry and capable of configuring the switching circuitry to operate the touch sensor panel in a first object sensing mode having a first resolution and a first gain, if no first touch or proximity event is detected in the first object sensing mode, configuring the switching circuit to operate the touch sensor panel in a second object sensing mode having a second resolution and a second gain greater than the first gain, and if no second touch or proximity event is detected in the second object sensing mode and the second gain is not a maximum gain, configuring the switching circuitry to operate the touch sensor panel in the second object sensing mode having a third gain greater than the second gain. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory computer readable storage medium having stored thereon a set of instructions for determining an object sensing mode of a touch sensor panel that when executed by a processor causes the processor to:
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operate the touch sensor panel in a first object sensing mode having a first resolution and a first gain; if no first touch or proximity event is detected in the first object sensing mode, switch the touch sensor panel to operate in a second object sensing mode having a second resolution and a second gain greater than the first gain; and if no second touch or proximity event is detected in the second object sensing mode and the second gain is not a maximum gain, switch the touch sensor panel to operate in the second object sensing mode having a third gain greater than the second gain. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification