Touch Position Detector of Capacitive Touch Panel and Method for Detecting the Touch Position
First Claim
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1. A touch position detector of a capacitive touch panel, comprising:
- a plurality of capacitive sensors for sensing a touch object;
a negative capacitance compensation unit coupled to the capacitive sensors, for compensating a basic capacitance of the capacitive sensor and obtaining a change of capacitance;
an analog/digital converter (ADC) coupled to the negative capacitance compensation unit, for converting the change of the capacitance to a digital signal; and
a micro controller unit coupled to the ADC, for detecting a position of the touch object according to the change of the capacitance.
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Abstract
A touch position detector includes a plurality of capacitance sensors, a negative capacitance compensation unit, an analog/digital converter and a micro processing unit. The negative capacitance compensation unit is utilized to compensate the capacitance of the capacitance sensor and get a capacitance change. The micro controller unit is utilized to detect the touch position according to the capacitance change. It is easy to get the touch position by using the touch position detector.
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Citations
9 Claims
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1. A touch position detector of a capacitive touch panel, comprising:
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a plurality of capacitive sensors for sensing a touch object; a negative capacitance compensation unit coupled to the capacitive sensors, for compensating a basic capacitance of the capacitive sensor and obtaining a change of capacitance; an analog/digital converter (ADC) coupled to the negative capacitance compensation unit, for converting the change of the capacitance to a digital signal; and a micro controller unit coupled to the ADC, for detecting a position of the touch object according to the change of the capacitance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting a touch position of a touch panel, comprising:
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setting an initial value for a capacitive sensor; inputting a negative capacitance compensation parameter and a capacitance gain parameter of a channel; measuring a capacitance of the channel; and detecting a touch position according to the capacitance of the channel. - View Dependent Claims (8, 9)
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Specification