Touch input device and system thereof

摘要

A touch input device provided in the present invention includes a pen tip, a pressure sensing module, a control unit and a PWM generator. The pen tip is utilized to touch a capacitive touchscreen and conduct a touchscreen driving signal. The pressure sensing module is utilized to generate a pressure sensing signal which corresponds to a pressure of the pen tip on the capacitive touchscreen. The control unit is utilized to receive the touchscreen driving signal and the pressure sensing signal, and then to generate a PWM control signal according to the pressure sensing signal. Further, a pulse width of the PWM control signal is proportional to the pressure. The PWM generator is utilized to provide a PWM signal to the pen tip according to the PWM control signal. A touch input system is further provided in the present invention.

主权项

1. A touch input device for performing an input on a capacitive touchscreen, comprising:
a pen tip utilized to touch the capacitive touchscreen and conduct a touchscreen driving signal; a pressure sensing module electrically coupled to the pen tip, utilized to generate a pressure sensing signal, which corresponds to a pressure of the pen tip on the capacitive touchscreen; a control unit utilized to receive the touchscreen driving signal and the pressure sensing signal, and then to generate a pulse width modulation (PWM) control signal according to the pressure sensing signal, wherein a pulse width of the PWM control signal is proportional to the pressure; and a PWM generator electrically coupled between the control unit and the pen tip, utilized to provide a PM signal to the pen tip according to the PWM control signal, wherein the PWM signal is utilized to make the touchscreen driving signal have a voltage difference according to a duty cycle of the PWM signal for position and pressure detection by measurement of the voltage difference.