Touch apparatus

Abstract

An exemplary embodiment of the present invention provides a touch apparatus including: a touch panel including a plurality of first touch electrodes arranged in a first direction and a plurality of second touch electrodes arranged in a second direction crossing the first direction; a driver configured to apply a first driving signal to the first touch electrodes during a first period and a second driving signal to the second touch electrodes during a second period subsequent to the first period; a receiver configured to receive a detection signal from the second touch electrodes during the first period, and a detection signal from the first touch electrodes and the second touch electrodes during a third period subsequent to the second period; and a controller configured to determine a touch position based on the signal outputted from the receiver.

What is claimed is: 
     
         1 . A touch apparatus comprising:
 a touch panel including a plurality of first touch electrodes arranged in a first direction and a plurality of second touch electrodes arranged in a second direction crossing the first direction;   a driver configured to apply a first driving signal to the first touch electrodes during a first period and a second driving signal to the second touch electrodes during a second period subsequent to the first period;   a receiver configured to receive a detection signal from the second touch electrodes during the first period, and a detection signal from the first touch electrodes and the second touch electrodes during a third period subsequent to the second period; and   a controller configured to determine a touch position based on the signal outputted from the receiver.   
     
     
         2 . The touch apparatus of  claim 1 , wherein
 the driver applies a pulse signal of a first frequency to the first touch electrodes as the first driving signal during the first period.   
     
     
         3 . The touch apparatus of  claim 2 , wherein
 the receiver includes an amplifier connected to each of the second touch electrodes during the first period to amplify and output a detection signal from a corresponding second touch electrode.   
     
     
         4 . The touch apparatus of  claim 2 , wherein
 the driver applies a pulse signal of a second frequency that is higher than the first frequency to both the first touch electrodes and the touch electrodes as the second driving signal during the second period.   
     
     
         5 . The touch apparatus of  claim 1 , wherein
 the receiver receives a detection signal from both the first touch electrodes and the second touch electrodes during the third period.   
     
     
         6 . The touch apparatus of  claim 1 , wherein
 the driver does not apply the second driving signal to the first touch electrodes and the second touch electrodes during the third period.   
     
     
         7 . The touch apparatus of  claim 1 , wherein
 the receiver includes a plurality of differential amplifiers that simultaneously receive detection signals from both the first touch electrodes and the second touch electrodes during the third period.   
     
     
         8 . The touch apparatus of  claim 7 , wherein
 the driver does not apply the second driving signal to the first touch electrodes and the second touch electrodes during the third period.   
     
     
         9 . The touch apparatus of  claim 8 , wherein
 the controller determines the third detection signal as a valid touch signal based on whether signal strength of the third detection signal exceeds a second threshold.   
     
     
         10 . The touch apparatus of  claim 7 , wherein
 the differential amplifiers include:   a first differential amplifier configured to receive detection signals from two first touch electrodes spaced by at least one first touch electrode; and   a second differential amplifier configured to receive detection signals from two second touch electrodes spaced by at least one second touch electrode.   
     
     
         11 . The touch apparatus of  claim 1 , wherein
 the detection signal includes at least one of a first detection signal generated by a first touch object and a second detection signal generated by a second touch object.   
     
     
         12 . The touch apparatus of  claim 11 , wherein
 the controller determines a detection signal as a valid touch signal based on whether a signal strength of the detection signal received in response to the first driving signal exceeds a first threshold during the first period, and   the first detection signal is determined as a valid touch signal, and the first threshold is set to filter the second detection signal.   
     
     
         13 . The touch apparatus of  claim 11 , wherein
 the first touch object includes at least one of a finger and a palm, and   the second touch object is a stylus pen   
     
     
         14 . A touch apparatus comprising:
 a touch panel including a plurality of first touch electrodes arranged in a first direction and a plurality of second touch electrodes arranged in a second direction crossing the first direction;   a driver configured to apply a first driving signal to the first touch electrodes during a first period and a second driving signal to the second touch electrodes during a second period subsequent to the first period;   a plurality of differential amplifiers configured to receive a detection signal from the first touch electrodes and the second touch electrodes during a third period subsequent to the second period; and   the controller configured to determine a touch position based on the signal outputted from the differential amplifiers.   
     
     
         15 . The touch apparatus of  claim 14 , wherein
 the differential amplifiers simultaneously receive detection signals from both the first touch electrodes and the second touch electrodes during the third period.   
     
     
         16 . The touch apparatus of  claim 14 , wherein
 the driver does not apply the second driving signal to the first touch electrodes and the second touch electrodes during the third period.   
     
     
         17 . The touch apparatus of  claim 14 , wherein
 the differential amplifiers receive only a third detection signal generated by the second touch object in response to the second driving signal during the third period.   
     
     
         18 . The touch apparatus of  claim 17 , wherein
 the third detection signal is determined as a valid touch signal based on whether signal strength of the third detection signal exceeds a second threshold.   
     
     
         19 . The touch apparatus of  claim 18 , wherein
 the differential amplifiers include:   a first differential amplifier configured to receive detection signals from two first touch electrodes spaced by at least one first touch electrode; and   a second differential amplifier configured to receive detection signals from two second touch electrodes spaced by at least one second touch electrode.   
     
     
         20 . The touch apparatus of  claim 14 , wherein
 the detection signal include at least one of a first detection signal generated by a first touch object and a second detection signal generated by a second touch object.