| 摘要 |
<p>PURPOSE: A touch input device is provided to user the entire surface of a touch window by extracting a coordinate through the analysis of a pulse waveform of a sound wave according to the touch on a touch window in at least one ultrasonic sensor unit. CONSTITUTION: At least one ultrasonic sensor unit(120,210) is installed at a touch window(110). According to the touch of the touch window, the ultrasonic sensor unit performs transmission and reception of a sound wave alternatively. The ultrasonic sensor unit extracts a coordinate through pulse waveform analysis of the sound wave. The one or more ultrasonic sensor unit operates as an ultrasonic transmitter. Rest of ultrasonic sensor units receive sound wave of the ultrasonic transmitter.</p> |
