Method and apparatus for reducing coupled noise influence in touch screen controllers
First Claim
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1. An apparatus comprising:
- a detector to determine a presence of a noise signal from a display coupled to a capacitive touch screen; and
a synchronization circuit to synchronize signals produced by a touch screen controller with the noise signal to reduce an influence of the noise signal on capacitance measurements by the touch screen controller.
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Abstract
Apparatuses and methods to reduce the influence of a noise signal on touch screen controllers are described. One apparatus includes a detector to determine a presence of a noise signal from a display coupled to a capacitive touch screen. The apparatus also includes a synchronization circuit to synchronize signals produced by a touch screen controller with the noise signal to reduce the influence of the noise signal on capacitance measurements by the touch screen controller.
13 Citations
20 Claims
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1. An apparatus comprising:
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a detector to determine a presence of a noise signal from a display coupled to a capacitive touch screen; and a synchronization circuit to synchronize signals produced by a touch screen controller with the noise signal to reduce an influence of the noise signal on capacitance measurements by the touch screen controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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performing a listening scan to determine a presence of a noise signal from a display coupled to a capacitive touch screen; generating signals to detect a touch proximate the capacitive touch screen; and synchronizing the signals with the noise signal to reduce an influence of the noise signal on capacitance measurements used to detect the touch. - View Dependent Claims (16, 17, 18)
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19. A system comprising:
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a display to produce images and a noise signal; a capacitive touch screen overlaying the display; a touch screen controller, coupled to the capacitive touch screen, comprising a detector and a synchronization circuit, the detector to determine a presence of the noise signal from the display; and the synchronization circuit to synchronize signals produced by the touch screen controller with the noise signal to reduce an influence of the noise signal on capacitance measurements by the touch screen controller. - View Dependent Claims (20)
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Specification