Elan Microelectronics Corporation

Yu Chiang

Tien-Wen Pao

Pin-Jung Chung

Shun-Chieh Wu

En-Hsiao Liao

Ching-Shoung Chang

A touchpad with a force sensing function and resistive pressure sensor thereof are disclosed. The resistive pressure sensor has a circuit board and a Wheatstone bridge circuit mounted on a deformation zone of the circuit board. The deformation zone deforms when a touchpad body is pressed by a force. The Wheatstone bridge circuit has a first upper-arm resistor, a first lower-arm resistor, a second upper-arm resistor and a second lower-arm resistor. The four arm resistors are in the deformation zone. A direction of current through the first lower-arm resistor and the second upper-arm resistor is different from a direction of current through the second lower-arm resistor and the first upper-arm resistor. Therefore, when the deformation zone of the circuit board deforms by the force, an output voltage of the Wheatstone bridge circuit is relatively increased to enhance a force sensitivity.

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Taoyuan, Taiwan

Yu Chiang