Display driver, display device and method of driving display panel

1. A display driver, comprising:

a controller configured to perform touch sensing during a first touch sensing period of a first field of a vertical sync period and to perform touch sensing during a second touch sensing period of a second field of the vertical sync period; and

gate control signal generator circuitry configured to:

generate a first set of multi-phase clock signals configured to control first gate line drive signals supplied to gate lines of a display panel during a first display period of the first field of the vertical sync period; and

generate a second set of multi-phase clock signals configured to control second gate line drive signals supplied to the gate lines of the display panel during a second display period of the second field of the vertical sync period, wherein a start time of a first multi-phase clock signal of the second set of multi-phase clock signals is based on an internal clock signal of the display driver and is before a start time of the second field of the vertical sync period.

2. The display driver of claim 1 , wherein the first field starts after an assertion of a vertical sync signal, wherein a length of a delay between the assertion of the vertical sync signal and the start of the first field corresponds to one or more assertions of a horizontal sync signal.

3. The display driver of claim 2 , wherein a length of the first touch sensing period corresponds to a frequency of the internal clock signal of the display driver and a frequency of the horizontal sync signal.

4. The display driver of claim 1 , further comprising:

timer circuitry including a counter configured to count a second clock signal, wherein the first multi-phase clock signal of the second set of multi-phase clock signals is generated in response to a count value of the counter reaching a first value.

5. The display driver of claim 4 , wherein the counter is configured to count the second clock signal in response to completion of the first touch sensing period.

6. The display driver of claim 1 , wherein each of the first gate line drive signals is driven high in response to an assertion of a respective one of the first multi-phase clock signals.

7. A display device, comprising:

a display panel comprising gate lines; and

a display driver coupled to the display panel and configured to:

perform touch sensing during a first touch sensing period of a first field of a vertical sync period and perform touch sensing during a second touch sensing period of a second field of the vertical sync period;

generate a first set of multi-phase clock signals configured to control first gate line drive signals supplied to the gate lines of the display panel during a first display period of the first field; and

generate a second set of multi-phase clock signals configured to control second gate line drive signals supplied to the gate lines of the display panel during a second display period of the second field of the vertical sync period, wherein a start time of a first multi-phase clock signal of the second set of multi-phase clock signals is based on an internal clock signal of the display driver and is before a start time of the second field of the vertical sync period.

8. The display device of claim 7 , wherein the first field starts after an assertion of a vertical sync signal, wherein a length of a delay between the assertion of the vertical sync signal and the start of the first field corresponds to one or more assertions of a horizontal sync signal.

9. The display device of claim 8 , wherein a length of the first touch sensing period corresponds to a frequency of the internal clock signal of the display driver and a frequency of the horizontal sync signal.

10. The display device of claim 8 , wherein the display driver is further configured to count a second clock signal, and wherein the first multi-phase clock signal of the second set of multi-phase clock signals is generated in response to the count reaching a first value.

11. The display device of claim 10 , wherein the display driver is configured to count the second clock signal in response to completion of the first touch sensing period.

12. The display device of claim 7 , wherein each of the first gate line drive signals is driven high in response to an assertion of a respective one of the first multi-phase clock signals.

13. A method for driving a display device having a display driver, the method comprising:

performing touch sensing during a first touch sensing period of a first field of a vertical sync period;

generating first multi-phase clock signals configured to control first gate line drive signals supplied to gate lines of a display panel during a first display period of the first field, wherein the first field starts after a delay from an assertion of the vertical sync period, and wherein a start timing of the first display period and a start timing of the first touch sensing period are synchronous with an internal clock signal of the display driver;

performing touch sensing during a second touch sensing period of a second field of the vertical sync period; and

generating a second set of multi-phase clock signals configured to control second gate line drive signals supplied to the gate lines of the display panel during a second display period of the second field of the vertical sync period, wherein a start time of a first multi-phase clock signal of the second set of multi-phase clock signals is based on the internal clock signal of the display driver and is before a start time of the second field of the vertical sync period.

14. The method of claim 13 , wherein the first field starts after an assertion of a vertical sync signal, wherein a length of a delay between the assertion of the vertical sync signal and the start of the first field corresponds to one or more assertions of a horizontal sync signal.

15. The method of claim 14 , wherein a length of the first touch sensing period corresponds to a frequency of the internal clock signal of the display driver and a frequency of the horizontal sync signal.

16. The method of claim 13 , further comprising:

counting a second clock signal, wherein the first multi-phase clock signal of the second set of multi-phase clock signals is generated in response to a count value reaching a first value.

17. The method of claim 16 , further comprising:

counting the second clock signal in response to completion of the first touch sensing period.

18. The display driver according to claim 1 , wherein the gate control signal generator circuitry is configured to prevent a time period between an end time of the first set of multi-phase clock signals and a start time of the second set of multi-phase clock signals from exceeding a predetermined amount of time.

19. The display device according to claim 7 , wherein the display driver is configured to prevent a time period between an end time of the first set of multi-phase clock signals and a start time of the second set of multi-phase clock signals from exceeding a predetermined amount of time.

20. The method according to claim 13 , wherein the display driver prevents a time period between an end time of the first set of multi-phase clock signals and a start time of the second set of multi-phase clock signals from exceeding a predetermined amount of time.