Display apparatus

A display apparatus comprising:

• a display panel that includes a plurality of pixels to display an image;
• a plurality of sensors that sense light to output first sensing signals;
• a sensor driver that sequentially provides a scan signal to the sensors during an n−th sensing frame among a plurality of sensing frames and stops providing the scan signal during an (n+1)−th sensing frame among the sensing frames;
• a normal signal generator that receives the first sensing signals from the sensors during the n−th sensing frame, receives noise signals from the sensors during the (n+1)−th sensing frame, and subtracts the noise signals from the first sensing signals to output second sensing signals;
• and
• a control circuit that receives the second sensing signals to calculate a position on the display panel based on the second sensing signals, where n is a positive integer equal to or greater than 1,
• wherein the normal signal generator counts the sensing frames to determine whether a current sensing frame is odd or even to determine whether received data is a first sensing signal or a noise signal, and
• wherein the normal signal generator comprises:
• a first frame memory;
• a second frame memory;
• a counter that counts the sensing frames to output a frame selection signal according to the count value;
• a selector that stores the first sensing signals in the first frame memory during the n−th sensing frame in response to the frame selection signal and stores the noise signals in the second frame memory during the (n+1)−th sensing frame in response to the frame selection signal;
• and
• a subtractor that subtracts the noise signals from the first sensing signals to output the second sensing signals.

A display apparatus comprising:

• a display panel that comprises a plurality of pixels each receiving a data signal to display an image;
• a data driver that reverses a polarity of the data signal with respect to the common voltage based on a polarity reversal signal;
• a timing controller that controls a period of the polarity reversal signal based on a selection signal;
• a plurality of sensors that sense light to output sensing signals;
• a read-out circuit that receives the sensing signals from the sensors;
• a sensor driver that sequentially provides the scan signal to the sensors during an n−th sensing frame among a plurality of sensing frames and stops providing the scan signal during an (n+1)−th sensing frame among the sensing frames, where n is a positive integer equal to or greater than 1;
• and
• a control circuit that receives the sensing signals from the read-out circuit to calculate a position on the display panel based on the sensing signals,
• wherein the read-out circuit further comprises a normal signal generator that receives the sensing signals from the sensors during the n−th sensing frame, receives noise signals from the sensors during the (n+1)−th sensing frame, and subtracts the noise signals from the sensing signals to output normal sensing signals, and
• wherein the normal signal generator comprises:
• a first frame memory;
• a second frame memory;
• a counter that counts the sensing frames to output a frame selection signal according to the count value;
• a selector that stores the sensing signals received during the n−th sensing frame in the first frame memory in response to the frame selection signal and stores the noise signals received during the (n+1)−th sensing frame in the second frame memory in response to the frame selection signal;
• and
• a subtractor that subtracts the noise signals from the sensing signals to output the normal sensing signals.