Sensing methods for touch sensing devices
First Claim
1. A sensing method for a touch sensing device which comprises a touch sensing array and an integrator, wherein the touch sensing array comprises a plurality of first sensing electrodes disposed successively, and the sensing method comprises:
- resetting the integrator;
measuring output signals corresponding to the first sensing electrodes, wherein the step of measuring the output signals corresponding to the first sensing electrodes comprises;
pre-charging a previous first sensing electrode among the first sensing electrodes to a first voltage;
connecting the previous first sensing electrode to the integrator;
measuring an output voltage of the integrator to obtain a previous first integration value;
pre-charging a current first sensing electrode among the first sensing electrodes, to a second voltage;
connecting the current first sensing electrode to the integrator;
measuring the output voltage of the integrator to obtain a current first integration value; and
calculating the difference between the previous first integration value and the current first integration value to obtain the output signal corresponding to the current first sensing electrode; and
measuring the output voltage of the integrator to obtain a first reference value after the integrator is reset,wherein the step of measuring output signals corresponding to the first sensing electrodes further comprising;
calculating the difference between the first reference value and the previous first integration value to obtain the output signal corresponding to the previous first sensing electrode.
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Abstract
A sensing method for a touch sensing device is provided. In one embodiment, for one set of interlaced receiving electrode and transmitting electrodes of the touch sensing device, an integrator coupled to the receiving electrode is reset only one time. In another embodiment, for each group of sensing electrodes, an integrator coupled to the sensing electrodes is reset only one time. Accordingly, the rate at which the touch sensing array is sensed may be increased. Noise reduced by the process of resetting the integrator due to charge injection effects may be decreased.
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Citations
9 Claims
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1. A sensing method for a touch sensing device which comprises a touch sensing array and an integrator, wherein the touch sensing array comprises a plurality of first sensing electrodes disposed successively, and the sensing method comprises:
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resetting the integrator; measuring output signals corresponding to the first sensing electrodes, wherein the step of measuring the output signals corresponding to the first sensing electrodes comprises; pre-charging a previous first sensing electrode among the first sensing electrodes to a first voltage; connecting the previous first sensing electrode to the integrator; measuring an output voltage of the integrator to obtain a previous first integration value; pre-charging a current first sensing electrode among the first sensing electrodes, to a second voltage; connecting the current first sensing electrode to the integrator; measuring the output voltage of the integrator to obtain a current first integration value; and calculating the difference between the previous first integration value and the current first integration value to obtain the output signal corresponding to the current first sensing electrode; and measuring the output voltage of the integrator to obtain a first reference value after the integrator is reset, wherein the step of measuring output signals corresponding to the first sensing electrodes further comprising; calculating the difference between the first reference value and the previous first integration value to obtain the output signal corresponding to the previous first sensing electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A sensing method for a touch sensing device which comprises a touch sensing array and an integrator, wherein the touch sensing array comprises a plurality of first sensing electrodes disposed successively, and the sensing method comprises:
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resetting the integrator; measuring output signals corresponding to the first sensing electrodes, wherein the step of measuring the output signals corresponding to the first sensing electrodes comprises; pre-charging a previous first sensing electrode among the first sensing electrodes to a first voltage; connecting the previous first sensing electrode to the integrator; measuring an output voltage of the integrator to obtain a previous first integration value; pre-charging a current first sensing electrode among the first sensing electrodes, to a second voltage; connecting the current first sensing electrode to the integrator; measuring the output voltage of the integrator to obtain a current first integration value; and calculating the difference between the previous first integration value and the current first integration value to obtain the output signal corresponding to the current first sensing electrode, wherein the step of measuring the output signals corresponding to the first sensing electrodes further comprises; determining whether there is a following first sensing electrode among the first sensing electrodes which is next to the current first sensing electrode; if there is a following first sensing electrode, pre-charging the following first sensing electrode to the first voltage; connecting the following first sensing electrode to the integrator; measuring the output voltage of the integrator to obtain a following first integration value; and calculating the difference between the current first integration value and the following first integration value to obtain the output signal corresponding to the following first sensing electrode, wherein in the step of measuring output signals corresponding to the first sensing electrodes, if there is no further first sensing electrode, the sensing method further comprises; resetting the integrator again; and measuring output signals corresponding to second electrodes of the touch sensing panel, wherein the second electrodes disposed successively and interlacing with the first electrodes, wherein the step of measuring the output signals corresponding to the second sensing electrodes comprises; pre-charging a previous second sensing electrode among the second sensing electrodes to one of the first and second voltages; connecting the previous second sensing electrode to the integrator; measuring the output voltage of the integrator to obtain a previous second integration value; pre-charging a current second sensing electrode among the second sensing electrodes to the other of the first and second voltages; connecting the current second sensing electrode to the integrator; measuring the output voltage of the integrator to obtain a current second integration value; and calculating the difference between the previous second integration value and the current second integration value to obtain the output signal corresponding to the current second sensing electrode, wherein the sensing method further comprises; after the step of resetting the integrator again, measuring the output voltage of the integrator to obtain a second reference value, wherein the step of measuring output signals corresponding to the second sensing electrodes further comprises; calculating the difference between the second reference value and the previous second integration value to obtain the output signal corresponding to the previous second sensing electrode.
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Specification