Noise rejection circuit for touch sensitive display
First Claim
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1. A touch sensitive display comprising:
- a touch panel configured to sense an object proximate to the panel;
a display device configured to display data; and
touch circuitry including a noise rejection circuit to reject noise introduced by the display device into the touch panel, the touch circuitry configured for rejecting the noise by combining touch panel stimulation signals to generate a noise signal, and combining the noise signal with a sense signal from the touch panel.
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Abstract
A noise rejection circuit for a touch sensitive display is disclosed. The noise rejection circuit can reject noise introduced by the touch sensitive display'"'"'s display device into its touch panel. The noise rejection circuit can be integrated into the touch circuitry of the touch sensitive display and can include a resistor to sense the noise and an amplifier to isolate the sensed noise for rejection.
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Citations
26 Claims
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1. A touch sensitive display comprising:
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a touch panel configured to sense an object proximate to the panel; a display device configured to display data; and touch circuitry including a noise rejection circuit to reject noise introduced by the display device into the touch panel, the touch circuitry configured for rejecting the noise by combining touch panel stimulation signals to generate a noise signal, and combining the noise signal with a sense signal from the touch panel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A circuit for rejecting noise in a touch sensitive display, comprising:
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multiple touch buffers configured to output stimulation signals to drive the display, the signals including noise; and an amplifier configured to isolate the noise from the stimulation signals, wherein at least two of the stimulation signals are coupled together to form a coupled signal, the coupling canceling the stimulation signals and leaving the noise in the coupled signal, and wherein the amplifier is configured to receive the coupled signal to isolate the noise in the coupled signal for rejection. - View Dependent Claims (14, 15)
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16. A circuit for rejecting noise in a touch sensitive display, comprising:
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multiple touch buffers configured to output stimulation signals to drive the display, the stimulation signals including noise; a noise amplifier coupled to the outputs of the touch buffers and configured to isolate the noise from the stimulation signals to form a noise signal; and a sense amplifier configured to receive sense signals generated from the stimulation signals with the noise rejected therefrom, the noise being rejected by applying the noise signal in the display. - View Dependent Claims (17, 18)
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19. A method for rejecting noise in a touch sensitive device, comprising:
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driving the device with stimulation signals, the stimulation signals including capacitively coupled noise; sensing the noise in the stimulation signals; isolating the noise in the stimulation signals to produce a noise signal; generating sense signals from the stimulation signals, the sense signals including the noise; and applying the noise signal to the sense signals so as to reject the noise in the sense signals. - View Dependent Claims (20, 21)
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22. A touch sensitive device comprising:
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a touch panel configured to sense an object proximate to the panel; a voltage circuit proximate to the panel; and touch circuitry including a noise rejection circuit to reject noise introduced by the voltage circuit into the touch panel, the touch circuitry configured for rejecting the noise by combining touch panel stimulation signals to generate a noise signal, and combining the noise signal with a sense signal from the touch panel. - View Dependent Claims (23, 24, 25, 26)
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Specification