Patent ID: 8619020

Claim:
A display apparatus comprising: a display panel that includes a plurality of pixels receiving a data signal having a polarity reversed with respect to a common voltage to display an image; a plurality of sensors that sense light and output at least one of a plurality of sensing signals; a read-out circuit that is charged with the sensing signals to generate charged signals in response to a first sampling signal generated during a period in which the common voltage has a predetermined reference voltage level; a control circuit that receives the charged signals to calculate a position on the display panel based on the received signals; a sensor driver that sequentially provides the scan signal to the sensors; a timing controller that outputs a second sampling signal having a logic high state during a predetermined period after the scan signal is generated; and a sampling signal generator that generates the first sampling signal based on the second sampling signal and a reference level period of the common voltage, wherein the first sampling signal is generated after the scan signal is generated for application to the sensors.