EQUALIZED CAPACITIVE TOUCHPAD AND TOUCH POSITIONING METHOD
First Claim
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1. An equalized capacitive touchpad, comprising:
- a touch sensor having a first sensing line in a first direction and a second sensing line in a second direction with a mutual capacitance therebetween;
a front-end circuit coupled to the first sensing line and the second sensing line, detecting a variation of the mutual capacitance to generate a sensed value; and
an equalizer coupled to the front-end circuit, determining an equalization value according to a position information defined by the first sensing line and the second sensing line, for correcting the sensed value.
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Abstract
An equalized capacitive touchpad and a touch positioning method for a capacitive touchpad use an equalizer to correct a sensed value of a mutual capacitance between two sensing lines of the capacitive touchpad, to thereby offset the attenuation of the sensed value due to the impedance of the two sensing lines. Thus, the sensed values generated from different positions along a sensing line are equalized, and the touch positioning accuracy of the capacitive touchpad is improved.
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13 Claims
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1. An equalized capacitive touchpad, comprising:
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a touch sensor having a first sensing line in a first direction and a second sensing line in a second direction with a mutual capacitance therebetween; a front-end circuit coupled to the first sensing line and the second sensing line, detecting a variation of the mutual capacitance to generate a sensed value; and an equalizer coupled to the front-end circuit, determining an equalization value according to a position information defined by the first sensing line and the second sensing line, for correcting the sensed value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A touch positioning method for a capacitive touchpad, comprising the steps of:
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detecting a variation of a mutual capacitance between a first sensing line in a first direction and a second sensing line in a second direction for generating a sensed value; determining an equalization value according to a position information defined by the first sensing line and the second sensing line; correcting the sensed value with the equalization value; and determining whether the capacitive touchpad is touched or identifying a touched position according to the corrected sensed value. - View Dependent Claims (12, 13)
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Specification