Control circuit and control method for capacitive touch panel
First Claim
1. A control circuit for a capacitive touch panel, the capacitive touch panel comprising a first trace and a second trace, the control circuit comprising:
- a modulator for providing a first signal and a second signal in phase with the first signal;
a multiplexer coupled with the capacitive touch panel and the modulator for providing the first signal to the first trace and the second signal to the second trace; and
a demodulator coupled with the multiplexer for demodulating a signal on the first trace with a reference signal.
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Accused Products
Abstract
A control circuit and a control method for a capacitive touch panel are provided. Therein, while a scanning signal charges and discharges each trace on the capacitive touch panel, a signal in phase with the scanning signal is provided to traces adjacent to the scanned trace or a ground layer under the scanned trace so as to lower parasitic capacitances between the scanned trace and the ground layer or other traces, thereby decreasing a base capacitance of the capacitive touch panel and enhancing a sensing result of the control circuit as well as providing a shielding effect and reducing noise interference so that the capacitive touch panel has improved performance.
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Citations
16 Claims
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1. A control circuit for a capacitive touch panel, the capacitive touch panel comprising a first trace and a second trace, the control circuit comprising:
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a modulator for providing a first signal and a second signal in phase with the first signal; a multiplexer coupled with the capacitive touch panel and the modulator for providing the first signal to the first trace and the second signal to the second trace; and a demodulator coupled with the multiplexer for demodulating a signal on the first trace with a reference signal. - View Dependent Claims (2, 3)
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4. A control circuit for a capacitive touch panel, the capacitive touch panel comprises a sensor layer and a ground layer, the control circuit comprising:
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a modulator for providing a first signal and a second signal in phase with the first signal; and a multiplexer coupled with the capacitive touch panel and the modulator for providing the first signal to the sensor layer and the second signal to the ground layer.
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5. A control method for a capacitive touch panel, the capacitive touch panel comprises a first trace and a second trace, the control method comprising the steps of:
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providing a first signal so as to charge and discharge the first trace; providing a second signal in phase with the first signal so as to charge and discharge the second trace; and demodulating a signal on the first trace with a reference signal. - View Dependent Claims (6, 7)
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8. A control method for a capacitive touch panel, the capacitive touch panel comprises a sensor layer and a ground layer, the control method comprising the steps of:
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providing a first signal so as to charge and discharge the sensor layer; and providing a second signal in phase with the first signal to the ground layer.
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9. A capacitive touch panel module, comprising:
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a capacitive touch panel having a first trace and a second trace; a modulator for providing a first signal and a second signal in phase with the first signal; a multiplexer coupled with the capacitive touch panel and the modulator for providing the first signal to the first trace and the second signal to the second trace; and a demodulator for demodulating a signal on the first trace with a reference signal. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A capacitive touch panel module, comprising:
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a capacitive touch panel having a sensor layer and a ground layer; a modulator for providing a first signal and a second signal in phase with the first signal; and a multiplexer coupled with the capacitive touch panel and the modulator for providing the first signal to the sensor layer and the second signal to the ground layer. - View Dependent Claims (16)
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Specification