TOUCH PANEL
First Claim
1. A touch panel, comprising:
- a first clock phase generator, generating a first phase signal and a second phase signal according to a first clock signal;
a panel capacitor;
a first capacitor;
a second capacitor;
a first switch, turned on/off based on a voltage level of the first phase signal, wherein a first end of the first switch is coupled to a first reference voltage, and a second end of the first switch is coupled to the panel capacitor;
a second switch, turned on/off based on a voltage level of the second phase signal, wherein a first end of the second switch is coupled to the panel capacitor;
a third switch, turned on/off based on the voltage level of the first phase signal, wherein a first end of the third switch is coupled to a second reference voltage, and a second end of the third switch is coupled to the first capacitor;
a fourth switch, turned on/off based on the voltage level of the second phase signal, wherein a first end of the fourth switch is coupled to the first capacitor, and a second end of the fourth switch is coupled to a second end of the second switch;
a control circuit, coupled to the second end of the second switch and the second end of the fourth switch, wherein the control circuit generates a third phase signal and a fourth phase signal based on a third reference voltage and a voltage level of the second end of the second switch;
a fifth switch, turned on/off based on a voltage level of the third phase signal, wherein a first end of the fifth switch is coupled to the second reference voltage, and a second end of the fifth switch is coupled to the second capacitor; and
a sixth switch, turned on/off based on a voltage level of the fourth phase signal, wherein a first end of the sixth switch is coupled to the second capacitor, and a second end of the sixth switch is coupled to the second end of the second switch and the second end of the fourth switch.
1 Assignment
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Accused Products
Abstract
A touch panel has a panel capacitor, a first capacitor, and a second capacitor. The panel capacitor and the first capacitor are charged and discharged cyclically according to a first phase signal and a second phase signal, such that an input voltage associated with the panel capacitor and the first capacitor is applied to a control circuit. The control circuit charges and discharges a second capacitor based on the input voltage and a reference voltage to compensate the difference between the input voltage and the reference voltage. The capacitance of the panel capacitor could be calculated based on the frequency of charging and discharging the second capacitor.
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Citations
19 Claims
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1. A touch panel, comprising:
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a first clock phase generator, generating a first phase signal and a second phase signal according to a first clock signal; a panel capacitor; a first capacitor; a second capacitor; a first switch, turned on/off based on a voltage level of the first phase signal, wherein a first end of the first switch is coupled to a first reference voltage, and a second end of the first switch is coupled to the panel capacitor; a second switch, turned on/off based on a voltage level of the second phase signal, wherein a first end of the second switch is coupled to the panel capacitor; a third switch, turned on/off based on the voltage level of the first phase signal, wherein a first end of the third switch is coupled to a second reference voltage, and a second end of the third switch is coupled to the first capacitor; a fourth switch, turned on/off based on the voltage level of the second phase signal, wherein a first end of the fourth switch is coupled to the first capacitor, and a second end of the fourth switch is coupled to a second end of the second switch; a control circuit, coupled to the second end of the second switch and the second end of the fourth switch, wherein the control circuit generates a third phase signal and a fourth phase signal based on a third reference voltage and a voltage level of the second end of the second switch; a fifth switch, turned on/off based on a voltage level of the third phase signal, wherein a first end of the fifth switch is coupled to the second reference voltage, and a second end of the fifth switch is coupled to the second capacitor; and a sixth switch, turned on/off based on a voltage level of the fourth phase signal, wherein a first end of the sixth switch is coupled to the second capacitor, and a second end of the sixth switch is coupled to the second end of the second switch and the second end of the fourth switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification