| 摘要 |
<p>According to the present invention, a touchscreen sensing device (10) is provided to detect an input of a touch on a capacitive touchscreen panel (20). The touchscreen sensing device at least includes a drive signal generating unit (300) which generates a drive signal applied to a driving line of the touchscreen panel (20); and a charge signal converting unit (200) which converts a charge signal outputted from a sensing line of the touchscreen panel (20) into a voltage signal. The touchscreen sensing device further includes a reference signal generating unit (100) which generates a reference signal applied to a non-inverting input end of the charge signal converting unit (200), wherein the reference signal is generated as a cycle signal of the same frequency as the frequency of the drive signal by using the drive signal or an external signal. According to the present invention, an offset value of a charge signal can be minimized or eliminated, the size of a feedback capacitor can be minimized, and accurate touch sensing can be facilitated while enabling an efficient use of an input dynamic range of an ADC.</p> |
