Touch sensing device, touch sensing circuit, data driving circuit, and display device driving method
The present disclosure provides a touch sensing device, a touch sensing circuit, a data driving circuit, and a display device driving method, which make it possible to activate different sensing areas according to a finger mode and a hover mode, and which activate as many sensing areas as possible simultaneously in a hover mode, which means sensing driving in the case of non-contact with regard to sensing areas, thereby enhancing sensing sensitivity, and improving sensing detection performance even in the hover mode.
1. A touch integrated display device, comprising:
a display panel including a plurality of touch electrodes, the display panel operated in a display period of a frame or a touch period of the frame; and
a touch driver circuit to provide a common voltage to the touch electrodes during the display period and to drive the touch electrodes with a touch drive signal during the touch period to detect a touch sensing signal responsive to a touch from the touch electrodes, wherein:
in a first touch mode, the touch driver circuit drives a first number of the touch electrodes with the touch drive signal during the touch period, and
in a second touch mode, the touch driver circuit drives a second number of the touch electrodes with the touch drive signal during the touch period, the second number of the touch electrodes being greater than the first number of the touch electrodes,
wherein a load-free driving signal having a same phase or amplitude as the touch drive signal is driven to one or more data lines or one or more gate lines of the display panel, during the touch period while the touch driver circuit drives the second number of the touch electrodes with the touch drive signal in the second touch mode.
2. The touch integrated display device of claim 1 , wherein the first touch mode is a contact touch mode in which the touch is a physical contact made with the touch integrated display device, and the second touch mode is a non-contact touch mode in which the touch does not make physical contact with the touch integrated display device but is within a predetermined distance from the touch integrated display device.
3. The touch integrated display device of claim 2 , wherein the touch in the non-contact touch mode is hovering over the touch integrated display device.
4. The touch integrated display device of claim 1 , wherein:
in the first touch mode, the touch drive signal has a reference waveform; and
in the second touch mode, the touch drive signal mimics the reference waveform but an amplitude of the touch drive signal in the second touch mode is overdriven by an overdrive amplitude with respect to the reference waveform during an overdrive duration.
5. The touch integrated display device of claim 4 , wherein:
the reference waveform is a pulse waveform periodically alternating between a high level and a low level, and
touch drive signal in the second touch mode has pulses with two or more different high voltage levels during the high level and two or more different low voltage levels during the low level.
6. The touch integrated display device of claim 5 , wherein:
at least some of the pulses of the touch drive signal in the second touch mode are not overdriven.
7. The touch integrated display device of claim 4 , wherein:
the reference waveform is a pulse waveform periodically alternating between a high level and a low level, and
the overdrive duration is as long as an entire width or a part of the width of a pulse of the pulse waveform.
8. The touch integrated display device of claim 1 , wherein the touch period of the frame includes both a first touch period of the first touch mode and a second touch period of the second touch mode.
9. The touch integrated display device of claim 8 , wherein the touch period of another frame subsequent to said frame includes the first touch period of the first touch mode but does not include the second touch period of the second touch mode, responsive to determining the touch in said frame is the physical contact touch in the first touch mode.
10. A driver circuit for driving a touch integrated display device, the touch integrated display device comprising a display panel including a plurality of touch electrodes, the display panel operated in a display period of a frame or a touch period of the frame, the driver circuit comprising:
circuitry to provide a common voltage to the touch electrodes during the display period and to drive the touch electrodes with a touch drive signal during the touch period to detect a touch sensing signal responsive to a touch from the touch electrodes, wherein:
in a first touch mode, the circuitry drives a first number of the touch electrodes with the touch drive signal during the touch period, and
in a second touch mode, the circuitry drives a second number of the touch electrodes with the touch drive signal during the touch period, the second number of the touch electrodes being greater than the first number of the touch electrodes,
wherein a load-free driving signal having a same phase or amplitude as the touch drive signal is driven to one or more data lines or one or more gate lines of the display panel, during the touch period while the circuitry drives the second number of the touch electrodes with the touch drive signal in the second touch mode.
11. The driver circuit of claim 10 , wherein the first touch mode is a contact touch mode in which the touch is a physical contact made with the touch integrated display device, and the second touch mode is a non-contact touch mode in which the touch does not make physical contact with the touch integrated display device but is within a predetermined distance from the touch integrated display device.
12. The driver circuit of claim 11 , wherein the touch in the non-contact touch mode is hovering over the touch integrated display device.
13. The driver circuit of claim 10 , wherein:
in the first touch mode, the touch drive signal has a reference waveform; and
in the second touch mode, the touch drive signal mimics the reference waveform but an amplitude of the touch drive signal in the second touch mode is overdriven by an overdrive amplitude with respect to the reference waveform during an overdrive duration.
14. The driver circuit of claim 13 , wherein:
the reference waveform is a pulse waveform periodically alternating between a high level and a low level, and
touch drive signal in the second touch mode has pulses with two or more different high voltage levels during the high level and two or more different low voltage levels during the low level.
15. The driver circuit of claim 14 , wherein:
at least some of the pulses of the touch drive signal in the second touch mode are not overdriven.
16. The driver circuit of claim 13 , wherein:
the reference waveform is a pulse waveform periodically alternating between a high level and a low level, and
the overdrive duration is as long as an entire width or a part of the width of a pulse of the pulse waveform.
17. The driver circuit of claim 10 , wherein the touch period of the frame includes both a first touch period of the first touch mode and a second touch period of the second touch mode.
18. The driver circuit of claim 17 , wherein the touch period of another frame subsequent to said frame includes only the first touch period of the first touch mode but does not include the second touch period of the second touch mode, responsive to determining that the touch in said frame is the physical contact touch in the first touch mode.
19. A method for driving a touch integrated display device, the touch integrated display device comprising a display panel including a plurality of touch electrodes, the display panel operated in a display period of a frame or a touch period of the frame, the method comprising:
providing a common voltage to the touch electrodes during the display period;
driving the touch electrodes with a touch drive signal during the touch period to detect a touch sensing signal responsive to a touch from the touch electrodes, wherein:
in a first touch mode, said driving the touch electrodes with a touch drive signal comprises driving a first number of the touch electrodes with the touch drive signal during the touch period, and
in a second touch mode, said driving the touch electrodes with a touch drive signal comprises driving a second number of the touch electrodes with the touch drive signal during the touch period, the second number of the touch electrodes being greater than the first number of the touch electrodes,
wherein a load-free driving signal having a same phase or amplitude as the touch drive signal is driven to one or more data lines or one or more gate lines of the display panel, during the touch period while the second number of the touch electrodes are driven with the touch drive signal in the second touch mode.
20. The method of claim 19 , wherein the first touch mode is a contact touch mode in which the touch is a physical contact made with the touch integrated display device, and the second touch mode is a non-contact touch mode in which the touch does not make physical contact with the touch integrated display device but is within a predetermined distance from the touch integrated display device.
21. The method of claim 20 , wherein the touch in the non-contact touch mode is hovering over the touch integrated display device.
22. The method of claim 19 , wherein:
in the first touch mode, the touch drive signal has a reference waveform; and
in the second touch mode, the touch drive signal mimics the reference waveform but an amplitude of the touch drive signal in the second touch mode is overdriven by an overdrive amplitude with respect to the reference waveform during an overdrive duration.
23. The method of claim 22 , wherein:
the reference waveform is a pulse waveform periodically alternating between a high level and a low level, and
touch drive signal in the second touch mode has pulses with two or more different high voltage levels during the high level and two or more different low voltage levels during the low level.
24. The method of claim 23 , wherein:
at least some of the pulses of the touch drive signal in the second touch mode are not overdriven.
25. The method of claim 22 , wherein:
the reference waveform is a pulse waveform periodically alternating between a high level and a low level, and
the overdrive duration is as long as an entire width or a part of the width of a pulse of the pulse waveform.
26. The method of claim 19 , wherein the touch period of the frame includes both a first touch period of the first touch mode and a second touch period of the second touch mode.
27. The method of claim 26 , wherein the touch period of another frame subsequent to said frame includes only the first touch period of the first touch mode but does not include the second touch period of the second touch mode, responsive to determining that the touch in said frame is the physical contact touch in the first touch mode.