Methods and touch devices using multiple sampling frequencies
First Claim
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1. A method comprising:
- at a touch panel comprising a matrix of overlapping drive signal lines and sense signal lines, driving the drive signal lines with voltage pulses configured to generate current signals at one or more of the sense signal lines in response to a touch input of a user at a point where the one or more sense signal lines overlap with one or more drive signal lines;
determining first and second sampling frequencies for use by a receiver in sampling current signals at the plurality of sense signal lines, wherein the second sampling frequency is different from the first sampling frequency;
sampling current signals at the sense signal lines in alternating first and second successive time frames, wherein only the first sampling frequency is used to sample the current signals at the sense signal lines during each of the first time frames and only the second sampling frequency is used to sample the current signals at the sense signal lines during each of the second time frames;
detecting noise that interferes with the first sampling frequency used in each of the first time frames;
while continuing to sample current signals at the sense signal lines using only the second sampling frequency, changing the first sampling frequency to a first candidate sampling frequency that is not interfered with by the detected noise; and
sampling current signals at the sense signal lines using only the first candidate sampling frequency during each of the first time frames and using only the second sampling frequency during each of the second time frames.
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Abstract
Techniques for using multiple sampling frequencies to detect the location of touch inputs of a user at a touch panel of a touch device. A determination is made as to which of and second sampling frequencies is provided to a receiver for use in sampling the touch inputs from the touch panel. The user touch inputs are first sampled from the touch panel during first and second successive time frames using first and second different sampling frequencies, respectively.
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Citations
14 Claims
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1. A method comprising:
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at a touch panel comprising a matrix of overlapping drive signal lines and sense signal lines, driving the drive signal lines with voltage pulses configured to generate current signals at one or more of the sense signal lines in response to a touch input of a user at a point where the one or more sense signal lines overlap with one or more drive signal lines; determining first and second sampling frequencies for use by a receiver in sampling current signals at the plurality of sense signal lines, wherein the second sampling frequency is different from the first sampling frequency; sampling current signals at the sense signal lines in alternating first and second successive time frames, wherein only the first sampling frequency is used to sample the current signals at the sense signal lines during each of the first time frames and only the second sampling frequency is used to sample the current signals at the sense signal lines during each of the second time frames; detecting noise that interferes with the first sampling frequency used in each of the first time frames; while continuing to sample current signals at the sense signal lines using only the second sampling frequency, changing the first sampling frequency to a first candidate sampling frequency that is not interfered with by the detected noise; and sampling current signals at the sense signal lines using only the first candidate sampling frequency during each of the first time frames and using only the second sampling frequency during each of the second time frames. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A touch device using multiple sampling frequencies, comprising:
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a touch panel including a matrix of overlapping drive signal lines and sense signal line; a control circuit, comprising; a driver configured to drive the drive signal lines with voltage pulses that generate current signals at one or more of the sense signal lines in response to a touch input of a user at a point where the one or more sense signal lines overlap with one or more drive signal lines; a receiver, configured to sample current signals at the plurality of sense signal lines; a sampling frequency generation circuit, connected to the receiver, configured to generate first and second sampling frequencies for use by the receiver in alternating first and second successive time frames, respectively, wherein the second sampling frequency is different from the first sampling frequency; and a microcontroller (MCU), configured to determine which of the first and second sampling frequencies is provided to the receiver for use in sampling the current signals at the plurality of sense signal lines, wherein only the first sampling frequency is used by the receiver to sample the current signals at the sense signal lines during each of the first time frames and only the second sampling frequency is used by the receiver to sample the current signals at the sense signal lines during each of the second time frames, and wherein the microcontroller is further configured to detect noise that interferes with the first sampling frequency, to cause the receiver to continue to sample the current signals at the sense signal lines using only the second sampling frequency while changing the first sampling frequency to a first candidate sampling frequency that is not interfered with by the detected noise, and to cause the receiver to sample current signals at the sense signal lines using only the first candidate sampling frequency during each of the first time frames and using only the second sampling frequency during each of the second time frames. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification