| 主权项 |
1. A touch point detecting device, comprising:
a plurality of electrodes; a scanning unit connected to said electrodes and configured to scan at least one of said electrodes with at least two variable excitation signal frequencies; and a processor configured to calculate a first baseline output value difference and a second baseline output value difference in a calibration step, to detect at least two variable output values generated on said corresponding electrode where at least one touch point occurs, to calculate an output value difference of said at least two corresponding output values when said at least one touch point occurs, and to calculate a distance between said at least one touch point and one of a first end or a second end of said electrode where said at least one touch point occurs according to said at least two variable output values; wherein the scanning unit is configured to scan each of said electrodes with said at least two variable excitation signal frequencies under the circumstances that said at least one touch point occurs at the first end of said electrode and occurs at the second end of said electrode, respectively, in the calibration step, wherein the processor is configured to further detect at least two variable output values generated on the first end of said corresponding electrode and detects at least two variable output values generated on the second end of said corresponding electrode in the calibration step, and wherein the first baseline output value difference is calculated according to said at least two corresponding variable output values occurred at the first end of said electrode, whereas the second baseline output value difference is calculated according to said at least two corresponding variable output values occurred at the second end of said electrode. |
