Touch display device including a touch sensing circuit
A touch display device may include a touch display panel including touch electrodes, data lines, gate lines, sensing lines, and sub-pixels; a data driving circuit connected to the data lines; a gate driving circuit connected to the gate lines; and a touch sensing circuit configured to output a touch driving signal to at least one touch electrode among the touch electrodes through at least one corresponding sensing line among the sensing lines. A first driving signal may be configured to be applied to at least one of the data lines while the touch driving signal is output to the at least one touch electrode. The first driving signal may have a same frequency as the touch driving signal and may have a phase difference from the touch driving signal.
1. A touch display device, comprising:
a touch display panel including touch electrodes, data lines, gate lines, sensing lines, and sub-pixels;
a data driving circuit connected to the data lines;
a gate driving circuit connected to the gate lines; and
a touch sensing circuit configured to output a touch driving signal to at least one touch electrode among the touch electrodes through at least one corresponding sensing line among the sensing lines,
wherein a first driving signal is configured to be applied to at least one of the data lines while the touch driving signal is output to the at least one touch electrode, and
wherein the first driving signal has a same frequency as the touch driving signal and has a phase difference from the touch driving signal.
2. The touch display device of claim 1 , wherein the first driving signal is configured to be applied to one or more of the data lines.
3. The touch display device of claim 1 , wherein the data driving circuit is configured to provide the first driving signal to the at least one of the data lines.
4. The touch display device of claim 1 , wherein, while the touch driving signal is output to the at least one touch electrode, a second driving signal is configured to be applied to one or more of the gate lines and/or a third driving signal is configured to be applied to one or more of remaining touch electrodes among the touch electrodes except the at least one touch electrode.
5. The touch display device of claim 4 , wherein the gate driving circuit is configured to provide the second driving signal to the one or more of the gate lines.
6. The touch display device of claim 4 , wherein the touch sensing circuit is configured to provide the third driving signal to the one or more of the remaining touch electrodes respectively through corresponding sensing lines among the sensing lines.
7. The touch display device of claim 4 , further comprising:
a phase delay circuit configured to delay a phase of at least one of the first driving signal, the second driving signal, and the third driving signal.
8. The touch display device of claim 1 , wherein the phase difference between the first driving signal and the touch driving signal is greater than 0 (zero) and less than a half of a wavelength of the touch driving signal.
9. The touch display device of claim 4 , wherein:
the touch driving signal and the first driving signal are signals whose phases are delayed compared to the second driving signal; and
the phase difference between the touch driving signal and the first driving signal is smaller than a phase difference between the second driving signal and the first driving signal.
10. The touch display device of claim 9 , wherein the phase difference between the second driving signal and the first driving signal is less than a half of a wavelength of the touch driving signal.
11. The touch display device of claim 4 , wherein:
the at least one touch electrode, a peripheral pattern adjacent to the at least one touch electrode, and the at least one corresponding sensing line electrically connecting the at least one touch electrode and the touch sensing circuit constitute a low pass filter;
a cutoff frequency of the low pass filter is determined according to a capacitance between the at least one touch electrode and the peripheral pattern and according to a resistance of the at least one corresponding sensing line;
the peripheral pattern includes at least one of a data line applied with the first driving signal among the data lines, a gate line applied with the second driving signal among the gate lines, and a touch electrode applied with the third driving signal among the touch electrodes; and
the cutoff frequency of the low pass filter becomes smaller as the phase difference between at least one of the first, second, and third driving signals and the touch driving signal is greater than zero.
12. The touch display device of claim 4 , wherein a waveform of each of the touch driving signal and at least one of the first, second, and third driving signal is a sine wave, a square wave, or a triangular wave.
13. The touch display device of claim 11 , wherein the peripheral pattern is disposed to overlap the at least one touch electrode.
14. The touch display device of claim 7 , further comprising:
a touch driving signal generator configured to generate the touch driving signal according to a touch driving generation signal and to output the generated touch driving signal to a touch driving circuit of the touch sensing circuit,
wherein the phase delay circuit is disposed between the touch driving signal generator and one of the data driving circuit, the gate driving circuit, and the touch driving circuit.