PHASE SHIFT REDUCTION IN TOUCH SIGNALS
First Claim
Patent Images
1. A method for reducing phase shifts in a touch image, comprising:
- generating an in-phase (I) signal for the touch image, the touch image having multiple phase shifts therein;
generating a quadrature phase (Q) signal for the touch image;
combining the I and Q signals to reduce the phase shifts; and
reconstructing the touch image from the combined I and Q signals.
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Abstract
Phase shift reduction in touch signals is disclosed. Touch signals with phase shifts can be demodulated with I- and Q-demodulation waveforms to generate the I and Q components of the signals. The I and Q components can then be combined so as to provide magnitude information not affected by the phase of the touch signals. The touch signals can be reconstructed with the combined I and Q components, thereby providing reconstructed touch signals with little or no phase shift.
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Citations
24 Claims
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1. A method for reducing phase shifts in a touch image, comprising:
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generating an in-phase (I) signal for the touch image, the touch image having multiple phase shifts therein; generating a quadrature phase (Q) signal for the touch image; combining the I and Q signals to reduce the phase shifts; and reconstructing the touch image from the combined I and Q signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for reducing phase shifts in a signal, comprising:
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capturing a signal with a phase shift; calculating in-phase (I) and quadrature phase (Q) components of the signal; and combining the I and Q components so as to reduce the phase shift in the signal. - View Dependent Claims (12, 13, 14, 15)
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16. A touch sensitive device comprising:
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a touch panel for capturing a touch image with phase shifts; scan logic for stimulating the touch panel to capture the touch image; and a processor for reducing phase shifts in the touch image, the processor capable of; calculating in-phase (I) and quadrature phase (Q) components of the touch image, and reconstructing the touch image with reduced phase shifts based on the combined I and Q components, wherein the combined I and Q components include magnitude information of the touch image and exclude phase information of the touch image. - View Dependent Claims (17, 18, 19)
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20. A system for reducing phase shifts in touch signals, comprising:
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a touch panel having multiple touch regions capable of generating the touch signals indicative of a proximate object, the touch regions including resistive components to introduce the phase shifts into the touch signals; and a processor capable of reducing the phase shifts in the generated touch signals based on a combination of an in-phase (I) component of the touch signals and a quadrature phase (Q) component of the touch signals. - View Dependent Claims (21, 22, 23, 24)
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Specification