Elan Microelectronics Corporation

Chung-Han Cheng

Chun-Chung Huang

Chao-Chi Yang

Tsun-Min Wang

I-Hau Yeh

Chung-An Tang

Jui-Che Lin

Tung-An Yao

Hung-Ming Huang

Chi-Tein Yeh

A fingerprint sensing system has a fingerprint sensing device and a power supply circuit. The fingerprint sensing device has a high-voltage input terminal and a low-voltage input terminal. During scan phases of the fingerprint sensing device, the power supply circuit provides a first voltage to the high voltage input terminal and provides a second voltage to the low voltage input terminal. During the read phases of the fingerprint sensing device, the power supply circuit provides a third voltage to the high voltage input terminal and provides a fourth voltage to the low voltage input terminal. A first voltage difference is between the first voltage and the second voltage. A second voltage difference is between the third voltage and the fourth voltage. The first voltage difference is greater than the second voltage difference.

Operating method for a fingerprint sensing device and fingerprint sensing system

An electronic stylus emits an excitation signal to apply to a trace of a capacitive touchpad module near a touch point when the electronic stylus touches the capacitive touchpad module, so as to change a waveform of a charging/discharging signal in the trace, and depending on the waveform variation, the capacitive touchpad module can identify the touch point.

Electronic stylus, capacitive touchpad module, and apparatus for touch input

Growing community of inventors

Kaohsiung, Taiwan

Chung-Han Cheng