METHOD AND APPARATUS FOR USING OSCILLATION SIGNALS WITH DIFFERENT PHASES TO DETECT CAPACITANCE VALUES AT CAPACITIVE SENSING NODES OF TOUCH PANEL
First Claim
1. A method for detecting capacitance values of a plurality of capacitive sensing nodes located at intersections of a plurality of drive lines and a sense line on a touch panel, comprising:
- obtaining a plurality of touch sense signals corresponding to the sense line during a plurality of time slots, respectively;
demodulating the touch sense signals with a first oscillation signal to generate a plurality of first demodulated signals;
demodulating the touch sense signals with a second oscillation signal to generate a plurality of second demodulated signals, wherein the second oscillation signal is different from the first oscillation signal; and
determining the capacitance values according to at least the first demodulated signals and the second demodulated signals.
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Abstract
A method for detecting capacitance values of a plurality of capacitive sensing nodes located at intersections of a plurality of drive lines and a sense line on a touch panel is provided. The method includes at least the following steps: obtaining a plurality of touch sense signals corresponding to the sense line during a plurality of time slots, respectively; demodulating the touch sense signals with a first oscillation signal to generate a plurality of first demodulated signals; demodulating the touch sense signals with a second oscillation signal to generate a plurality of second demodulated signals, wherein the second oscillation signal is different from the first oscillation signal; and determining the capacitance values according to at least the first demodulated signals and the second demodulated signals.
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Citations
20 Claims
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1. A method for detecting capacitance values of a plurality of capacitive sensing nodes located at intersections of a plurality of drive lines and a sense line on a touch panel, comprising:
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obtaining a plurality of touch sense signals corresponding to the sense line during a plurality of time slots, respectively; demodulating the touch sense signals with a first oscillation signal to generate a plurality of first demodulated signals; demodulating the touch sense signals with a second oscillation signal to generate a plurality of second demodulated signals, wherein the second oscillation signal is different from the first oscillation signal; and determining the capacitance values according to at least the first demodulated signals and the second demodulated signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A touch controller for detecting capacitance values of a plurality of capacitive sensing nodes located at intersections of a plurality of drive lines and a sense line on a touch panel, comprising:
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a first demodulator, arranged for demodulating a plurality of touch sense signals corresponding to the sense line with a first oscillation signal to generate a plurality of first demodulated signals, wherein the touch sense signals are obtained during a plurality of time slots, respectively; a second demodulator, arranged for demodulating the touch sense signals with a second oscillation signal to generate a plurality of second demodulated signals, wherein the second oscillation signal is different from the first oscillation signal; and a determining unit, arranged for determining the capacitance values according to at least the first demodulated signals and the second demodulated signals. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory machine readable medium storing a program code which, when executed by a processor, causes the processor to perform following steps for detecting capacitance values of a plurality of capacitive sensing nodes located at intersections of a plurality of drive lines and a sense line on a touch panel:
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demodulating a plurality of touch sense signals corresponding to the sense line with a first oscillation signal to generate a plurality of first demodulated signals, wherein the touch sense signals are obtained during a plurality of time slots, respectively; demodulating the touch sense signals with a second oscillation signal to generate a plurality of second demodulated signals, wherein the second oscillation signal is different from the first oscillation signal; and determining the capacitance values according to at least the first demodulated signals and the second demodulated signals. - View Dependent Claims (20)
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Specification