Touch apparatus and touch detection method thereof
An exemplary embodiment of the present invention provides a touch apparatus including: a touch panel configured to include a plurality of touch electrodes; a touch driver configured to apply a first driving signal to a first touch electrode of the touch electrodes during a first period, and a second driving signal to the touch electrodes during a second period subsequent to the first period; and a touch controller configured to determine 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, 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, and the first detection signal is determined as a valid touch signal, while the first threshold is set to filter the second detection signal.
1. A touch apparatus comprising:
a touch panel configured to include a plurality of touch electrodes; and
a touch driver configured to apply a first driving signal to a first touch electrode of the touch electrodes during a first period, and a second driving signal to the touch electrodes during a second period subsequent to the first period; and
a touch controller configured to determine 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 or whether a signal strength of the detection signal received in response to the second driving signal exceeds a second threshold during the second period,
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, and
wherein the touch driver applies the second driving signal to the touch electrodes, and receives the detection signal generated by resonance of the second touch object in response to the second driving signal when the second driving signal has a disable level, during the second period.
2. The touch apparatus of claim 1 , wherein
the first threshold is different from the second threshold.
3. The touch apparatus of claim 1 , wherein
the second threshold is less than the first threshold.
4. The touch apparatus of claim 1 , wherein
the second touch object is a stylus pen.
5. The touch apparatus of claim 4 , wherein
the first touch object includes at least one of a finger and a palm.
6. The touch apparatus of claim 1 , wherein
the first driving signal is a pulse signal having a first frequency and the second driving signal is a pulse signal having a second frequency, and the first frequency and the second frequency are different from each other.
7. The touch apparatus of claim 1 , wherein
the touch driver applies the second driving signal to all of the touch electrodes in phase during the second period, and receives a detection signal from all of the touch electrodes when the second driving signal has a disable level.
8. The touch apparatus of claim 7 , wherein
the touch driver applies the second driving signal during the first sub period in the second period, and stops applying the second driving signal during the second sub period in the second period.
9. The touch apparatus of claim 7 , wherein
the touch driver applies the second driving signal during the first sub period in the second period, and applies a third driving signal having a different ratio of a disable level period to an enable level period to all of the touch electrodes in one repeated cycle by comparing it with the second driving signal during the second sub period in the second period.
10. The touch apparatus of claim 9 , wherein
the third driving signal has a ratio of the disable level period to the enable level period which is at least one of a:2b+1, a:2b+2, a:2b+3, a:2b+4, a:(3b+1), a:2(b+3)+1,
a:2(b+3), and a:(2b+1), in one repeated cycle, and a and b are positive integers.
11. The touch apparatus of claim 1 , wherein
the touch electrodes include the first touch electrodes and the second touch electrodes, the first touch electrodes extend in a first direction and are arranged in a second direction crossing the first direction, and the second touch electrodes extend in the second direction and are arranged in the first direction.
12. The touch apparatus of claim 11 , wherein
the touch driver receives a detection signal from all of the second touch electrodes while applying the first driving signal to the first touch electrode.
13. The touch apparatus of claim 11 , wherein
the touch driver includes a first driver connected with the first touch electrodes and a second driver connected with the second touch electrodes, and the first driver includes a differential amplifier connected to two first touch electrodes and an ADC unit for converting the differentially amplified signal into a digital signal.
14. A touch detection method comprising: applying a first driving signal to a first touch electrode among a plurality of touch electrodes included in a touch panel during a first period; determining 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 calculating touch coordinates by using the valid touch signal; applying a second driving signal to the touch electrodes during a second period after the first period; and determining the detection signal as a valid touch signal based on whether a signal strength of the detection signal exceeds a second threshold, 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, and wherein the touch detection method further comprises receiving the detection signal generated by resonance of the second touch object in response to the second driving signal when the second driving signal has a disable level, during the second period.
15. The touch detection method of claim 14 , wherein
the first threshold is different from the second threshold.
16. The touch detection method of claim 14 , wherein
the second threshold is less than the first threshold.
17. The touch detection method of claim 14 , wherein
the applying of the first driving signal to the first touch electrode among the touch electrodes included in the touch panel during the first period includes receiving a detection signal from all of the second touch electrodes while applying the first driving signal to the first touch electrode.
18. The touch detection method of claim 14 , wherein
the applying of the second driving signal to the touch electrodes during the second period that is continuous to the first period includes:
applying the second driving signal to all of the touch electrodes in phase during the second period; and
receiving the detection signal from all of the touch electrodes when the second driving signal has a disable level.