Concurrent touch and negative pixel scan
First Claim
1. A method for performing a scan at a touch panel, wherein the touch panel comprises a first set of conductive lines and a second set of conductive lines, the method comprising:
- performing a first scan at the touch panel, the touch panel being in a first configuration wherein the first set of conductive lines are configured as drive lines and the second set of conductive lines are configured as sense lines;
during the first scan, capturing a first set of first signals indicating a touch at the touch panel and a first set of second signals indicating a negative pixel effect at the touch panel;
switching the touch panel from the first configuration to a second configuration;
performing a second scan at the touch panel, the touch panel being in the second configuration wherein the second set of conductive lines are configured as drive lines and the first set of conductive lines are configured as sense lines;
during the second scan, capturing a second set of first signals indicating the touch at the touch panel and a second set of second signals indicating the negative pixel effect at the touch panel; and
generating a modified touch signal based on the first and second set of first signals and the first and second set of second signals to compensate for the negative pixel effect.
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Accused Products
Abstract
A concurrent touch and negative pixel scan performed at a touch panel is disclosed. The concurrent scan can include sensing an object proximate to the touch panel and sensing a negative pixel effect, based the object'"'"'s grounding condition, at the touch panel, at the same time. As a result, sense signals indicative of the proximity of the object and coupling signals indicative of the negative pixel effect'"'"'s magnitude can be captured concurrently. Because the negative pixel effect can cause errors or distortions in the sense signals, the coupling signals can be used to compensate the sense signals for the negative pixel effect.
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Citations
12 Claims
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1. A method for performing a scan at a touch panel, wherein the touch panel comprises a first set of conductive lines and a second set of conductive lines, the method comprising:
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performing a first scan at the touch panel, the touch panel being in a first configuration wherein the first set of conductive lines are configured as drive lines and the second set of conductive lines are configured as sense lines; during the first scan, capturing a first set of first signals indicating a touch at the touch panel and a first set of second signals indicating a negative pixel effect at the touch panel; switching the touch panel from the first configuration to a second configuration; performing a second scan at the touch panel, the touch panel being in the second configuration wherein the second set of conductive lines are configured as drive lines and the first set of conductive lines are configured as sense lines; during the second scan, capturing a second set of first signals indicating the touch at the touch panel and a second set of second signals indicating the negative pixel effect at the touch panel; and generating a modified touch signal based on the first and second set of first signals and the first and second set of second signals to compensate for the negative pixel effect. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A touch sensor panel comprising:
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a first set of conductive lines; a second set of conductive lines; switching circuitry configured to; switch the touch panel into a first configuration wherein the first set of conductive lines are configured as drive lines and the second set of conductive lines are configured as sense lines; and switch the touch panel into a second configuration wherein the second set of conductive lines are configured as drive lines and the first set of conductive lines are configured as sense lines; and scan circuitry configured to; perform a first scan at the touch panel in the first configuration; during the first scan, capturing a first set of first signals indicating a touch at the touch panel and a first set of second signals indicating a negative pixel effect at the touch panel; perform a second scan at the touch panel in the second configuration; during the second scan, capturing a second set of first signals indicating the touch at the touch panel and a second set of second signals indicating the negative pixel effect at the touch panel; and generating a modified touch signal based on the first and second set of first signals and the first and second set of second signals to compensate for the negative pixel effect. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification