APPARATUS AND METHOD FOR MEASURING CAPACITANCE IN TOUCH SENSOR
First Claim
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1. An apparatus for measuring capacitance in a touch sensor, the apparatus comprising:
- a panel driver configured to drive a panel load in the touch sensor according to a reference voltage; and
a capacitive load detector configured to measure capacitance of the panel load by sensing a panel load driving current that is applied to the panel load by the panel driver.
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Abstract
An apparatus and method are provided to rapidly and accurately measure the variation of capacitance in a panel load of a touch sensor and thus increase touch sensitivity and noise resistance. The apparatus includes a panel driver configured to drive a panel load in the touch sensor according to a reference voltage, and a capacitive load detector configured to measure capacitance of the panel load by sensing a panel load driving current that is applied to the panel load by the panel driver.
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Citations
23 Claims
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1. An apparatus for measuring capacitance in a touch sensor, the apparatus comprising:
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a panel driver configured to drive a panel load in the touch sensor according to a reference voltage; and a capacitive load detector configured to measure capacitance of the panel load by sensing a panel load driving current that is applied to the panel load by the panel driver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for measuring capacitance in a touch sensor, the method comprising:
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performing a transition of a reference voltage from a first level to a second level when the touch sensor is initialized, the second level being higher than the first level; and measuring capacitance of a sensing capacitor in a capacitance measuring circuit coupled to a panel load of the touch sensor when a load voltage for driving the panel load is converged on the second level when a predetermined time passes from the transition of the reference voltage; and detecting load capacitance of the panel load using the capacitance of the sensing capacitor. - View Dependent Claims (19, 20)
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21. A method for measuring capacitance in a touch sensor, the method comprising:
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performing a transition of a reference voltage from a second level to a first level when the touch sensor is initialized, the first level being lower than the second level; and measuring capacitance of a sensing capacitor in a capacitance measuring circuit coupled to a panel load of the touch sensor when a load voltage for driving the panel load is converged on the first level when a predetermined time passes from the transition of the reference voltage; and detecting load capacitance of the panel load using the capacitance of the sensing capacitor. - View Dependent Claims (22, 23)
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Specification