Negative Pixel Compensation
First Claim
1. A circuit comprising:
- multiple first lines, each first line configured to be switchable;
multiple second lines configured to associate with the first lines; and
switching circuitry coupled to at least the first lines and configured to operate the circuit in a configuration for measuring a grounding condition of an object proximate to the circuit by switching at least one of the first lines to transmit a stimulation signal and at least another of the first lines to transmit a capacitance signal indicative of the grounding condition of the object.
1 Assignment
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Accused Products
Abstract
Negative pixel compensation in a touch sensitive device is disclosed. The device can compensate for a negative pixel effect in touch signal outputs due to poor grounding of an object touching the device. To do so, the device can switch to a configuration to measure the grounding condition of the touching object and use the measurement to compensate the touch output values from the device accordingly. In the switched configuration, a first set of lines of the device can be switched between a coupling to a stimulation signal input to drive the device, a coupling to a capacitance signal output to output a signal indicative of the object'"'"'s grounding condition, and a coupling to ground. A second set of lines of the device can be coupled to a touch signal output to output a signal indicative of the object'"'"'s touch at the device. In addition or alternatively, in the switched configuration, the first set of lines of the device can be switched to function as the second set of lines and vice versa. The grounding signal can be applied to the touch signal to compensate for the negative pixel effect.
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Citations
25 Claims
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1. A circuit comprising:
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multiple first lines, each first line configured to be switchable; multiple second lines configured to associate with the first lines; and switching circuitry coupled to at least the first lines and configured to operate the circuit in a configuration for measuring a grounding condition of an object proximate to the circuit by switching at least one of the first lines to transmit a stimulation signal and at least another of the first lines to transmit a capacitance signal indicative of the grounding condition of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A circuit comprising:
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multiple first lines, at least one of the first lines being configured to drive the circuit with a stimulation signal and at least one other first line being configured to sense a first capacitance between an object proximate to the circuit and ground; multiple second lines associated with to the first lines to form pixels and configured to sense a second capacitance at the pixels indicative of a touch by the object; and a processor programmable for compensating the second capacitance with the first capacitance based on a grounding condition of the object. - View Dependent Claims (12, 13, 14)
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15. A method comprising:
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configuring at least one drive line of a touch sensitive device having multiple drive and sense lines to receive a stimulation signal; configuring at least one other drive line to sense a grounding condition of an object touching the device; and compensating sense signals detected on one or more sense lines based on the sensed grounding condition. - View Dependent Claims (16, 17, 18, 19)
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20. A touch sensor panel comprising:
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multiple drive lines, at least one of the drive lines being switchably configured to receive a stimulation signal to drive the panel, a group of other drive lines being switchably configured to measure a proximate object capacitance generated by the driving of the stimulation signal, the measured capacitance indicative of a grounding condition of the object; multiple sense lines configured to associate with the drive lines and transmit touch signals indicative of a touch by the object at the panel; and switching circuitry coupled to the drive lines and configured to switch the drive lines. - View Dependent Claims (21)
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22. A touch sensitive device comprising:
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a touch sensor panel configured to sense an object proximate thereto; scan logic couplable to the touch sensor panel and configured to perform a scan sequence on the panel to measure a touch by the object at the panel and to measure grounding of the object; and a processor configured to compensate touch measurements according to grounding measurements. - View Dependent Claims (23, 24, 25)
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Specification