Touch driving signal generating device, touch driving device including the same, and display device and driving method thereof

1. A touch driving device for driving a touch sensitive display panel, comprising:

a first circuit configured to generate a touch driving signal including a plurality of pulses with varying amplitudes or varying periods, responsive to detection of presence or absence of a touch on the touch sensitive display panel during a touch sensing period, and

a second circuit configured to apply the touch driving signal to a touch electrode of the touch sensitive display panel during the touch sensing period,

wherein the touch sensing period comprises a touch period or a non-touch period according to whether the touch sensitive display panel is touched, wherein during the non-touch period, in which the touch sensitive display period is not determined to be touched, at least one of the amplitudes of one or more of the plurality of pulses corresponding to the non-touch period is less than at least one of the amplitudes of one or more of the plurality of pulses corresponding to the touch period, in which the touch sensitive display panel is determined to be touched.

2. The touch driving device of claim 1 , wherein the first circuit is configured to generate the touch driving signal which is to be supplied to at least one of a gate line and a data line of the touch sensitive display panel during the touch sensing period.

3. The touch driving device of claim 1 , wherein during the non-touch period, in which the touch sensitive display panel is not determined to be touched, the first circuit is further configured to progressively decrease the amplitudes of two or more of the plurality of pulses.

4. The touch driving device of claim 1 , wherein during the touch period, in which the touch sensitive display panel is determined to be touched, the first circuit is further configured to progressively increase the amplitudes of two or more pulses of the plurality of pulses.

5. The touch driving device of claim 1 , wherein during the non-touch period, the first circuit is further configured to generate two or more pulses of the plurality of pulses having different amplitude.

6. The touch driving device of claim 5 , wherein during the non-touch period, at least two of the plurality of pulses have a substantially same amplitude as each other.

7. The touch driving device of claim 1 ,

wherein during the non-touch period, in which the touch sensitive display panel is not determined to be touched, the one or more of the plurality of pulses corresponding to the non-touch period have amplitudes lower than a reference amplitude, and

wherein during the touch period, in which the touch sensitive display panel is determined to be touched, the one or more of the plurality of pulses corresponding to the touch period have the reference amplitude.

8. The touch driving device of claim 1 , wherein the first circuit comprises:

a clock signal generator configured to generate a plurality of reference pulses, each of the plurality of reference pulses associated with a corresponding one of the plurality of pulses;

a modulation voltage generator configured to divide an input voltage having a reference voltage level to generate a plurality of modulation voltages having different voltage levels;

a voltage selector configured to select, for each of the plurality of reference pulses, a corresponding modulation voltage from the plurality of modulation voltages; and

a voltage varying circuit configured to generate the plurality of pulses by changing, for each of the plurality of reference pulses, an amplitude of a reference pulse of the plurality of reference pulses according to the corresponding modulation voltage.

9. The touch driving device of claim 1 ,

wherein the touch sensitive display panel displays an image during an image display period, the touch sensitive display panel comprising a gate line and a data line, and

wherein the first circuit is configured to generate the plurality of pulses which is to be simultaneously supplied to the gate line and the data line during the touch sensing period.

10. The touch driving device of claim 1 ,

wherein the touch sensitive display panel displays an image during an image display period, the touch sensitive display panel comprising a gate line and a data line,

wherein the first circuit is further configured to generate additional plurality of pulses, each of the additional plurality of pulses having a substantially same amplitude as a corresponding one of the plurality of pulses, the one of the plurality of pulses centered around a first voltage level, the additional plurality of pulses centered around a second voltage level different than the first voltage level, and

wherein the first circuit is further configured to generate the additional plurality of pulses which is to be supplied to the gate line during the touch sensing period.

11. The touch driving device of claim 1 , wherein the second circuit comprises:

a common voltage generator generating a common voltage; and

a first switching unit configured to:

connect the touch electrode to the common voltage generator during an image display period to apply the common voltage to the touch electrode, and

connect the touch electrode to the first circuit to apply the plurality of pulses to the touch electrode and determine whether the touch sensitive display panel is touched or not.

12. The touch driving device of claim 1 , further comprising:

a data driving circuit unit configured to:

apply a data signal to a data line during an image display period for displaying an image, and

apply the touch driving signal supplied from the first circuit to the data line during the touch sensing period.

13. The touch driving device of claim 12 , wherein the data driving circuit unit further comprises:

a data driver configured to generate the data signal; and

a second switching unit configured to:

connect the data line to the data driver to supply the data signal to the data line during the image display period, and

connect the data line to the first circuit to apply the plurality of pulses to the data line during the touch sensing period.

14. A display device comprising:

a touch sensitive display panel including a gate line, a data line, and a touch electrode;

a first circuit configured to generate a touch driving signal including a plurality of pulses with varying amplitudes or varying periods, responsive to detection of presence or absence of a touch on the touch sensitive display panel during a touch sensing period; and

a second circuit configured to apply the touch driving signal to the touch electrode of the touch sensitive display panel during the touch sensing period,

wherein the touch sensing period comprises a touch period or a non-touch period according to whether the touch sensitive display panel is touched, wherein during the non-touch period, in which the touch sensitive display panel is not determined to be touched, at least one of the amplitudes of one or more of the plurality of pulses corresponding to the non-touch period is less than at least one of the amplitudes of one or more of the plurality of pulses corresponding to the touch period, in which the touch sensitive display panel is determined to be touched.

15. The display device of claim 14 , wherein the first circuit is further configured to:

generate the touch driving signal which is to be supplied to at least one of the gate line and the data line of the touch sensitive display panel during the touch sensing period.

16. The display device of claim 14 , wherein the first circuit is further configured to:

generate additional plurality of pulses, each of the additional plurality of pulses having a same amplitude with a corresponding one of the plurality of pulses, the plurality of pulses centered around a first voltage level, the additional plurality of pulses centered around a second voltage level different from the first voltage level; and

generate the additional plurality of pulses which is to be supplied to the gate line during the touch sensing period.

17. The display device of claim 14 , wherein, during the non-touch period, in which the touch sensitive display panel is not determined to be touched, the first circuit is configured to progressively decrease the amplitudes of two or more of the plurality of pulses.

18. The display device of claim 14 , wherein, during the touch period, in which the touch sensitive display panel is determined to be touched, the first circuit is further configured to progressively increase the amplitudes of two or more pulses of the plurality of pulses.

19. A method of sensing a touch by a touch sensitive display panel comprising a gate line, a data line, and a touch electrode, the method comprising:

displaying an image by the touch sensitive display panel during an image display period;

generating a touch driving signal including a plurality of pulses with varying amplitudes or varying periods, responsive to determining whether the touch sensitive display panel is touched or not during a touch sensing period; and

applying the touch driving signal to the touch electrode during the touch sensing period,

wherein the touch sensing period comprises a touch period or a non-touch period according to whether the touch sensitive display panel is touched, wherein during the non-touch period, in which the touch sensitive display panel is not determined to be touched, at least one of the amplitudes of one or more of the plurality of pulses corresponding to the non-touch period is less than at least one of the amplitudes of one or more of the plurality of pulses corresponding to the touch period, in which the touch sensitive display panel is determined to be touched.

20. The method of claim 19 , further comprising:

generating additional plurality of pulses, each of the additional plurality of pulses having a same amplitude with a corresponding one of the plurality of pulses, the plurality of pulses centered around a first voltage level, the additional plurality of pulses centered around a second voltage level different from the first voltage level;

applying the additional plurality of pulses to the gate line during the touch sensing period; and

applying the plurality of pulses to the data line during the touch sensing period.

21. The method of claim 19 , further comprising:

progressively decreasing amplitudes of two or more of the plurality of pulses, responsive to determining that the touch sensitive display panel is not touched during the non-touch period.

22. The method of claim 21 , further comprising:

progressively increasing amplitudes of two or more pulses of the plurality of pulses, responsive to determining that the touch sensitive display panel is touched during the touch period.