Elan Microelectronics Corporation

Tse-Chi Lin

Chun-Yu Lin

Chun-Chung Huang

Tsun-Min Wang

Lionel Nicolas Portmann

An equalized capacitive touchpad and a touch positioning method for a capacitive touchpad use an equalizer to correct a sensed value detected from a sensing line of the capacitive touchpad, to thereby offset the attenuation of the sensed value due to the impedance of the sensing line. 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.

Equalized capacitive touchpad and touch positioning method

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.

Touch position detector of capacitive touch panel and method for detecting the touch position

In a reference current generator, a current mirror has a referent branch with a first current flowing thereon and a mirror branch to produce a second current by mirroring the first current, a first transistor is coupled to the referent branch, a second transistor is coupled to the mirror branch and has a gate coupled to the gate of the first transistor, one or more third transistors each produces a reference current by mirroring the first current or the second current to supply for a load, and a resistor having a resistance proportional to the absolute temperature is coupled to the first transistor such that a third current equal to the summation of the first current and all the mirrored reference currents flows through the resistor.

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Yunghe, Taiwan

Tse-Chi Lin