Serrated input sensing intervals
View Patent ↗Embodiments of the present disclosure provide a technique for input sensing using an input device having a display device with an integrated sensing device. Input sensing is performed over a long sensing interval to attain narrow-band filtering, and is temporarily suspended for short intervals (within the long sensing interval) to refresh the row selection logic of the display device.
1. A processing system configured to drive an input device comprising a display device with an integrated sensing device, the processing system comprising:
a driver module comprising driver circuitry, wherein the driver module is configured to be coupled to a plurality of sensor electrodes and a plurality of display lines, wherein each sensor electrode comprising at least one common electrode of a plurality of common electrodes configured for display updating and capacitive sensing, wherein the driver module is configured for:
driving row selection logic of the input device to select a first display line of the plurality of display lines for display updating during a display update period of a first display frame;
driving a first sensor electrode of the plurality of sensor electrodes for capacitive sensing during a non-display update period of the first display frame; and
driving the row selection logic during a row selection logic refresh period for display updating, wherein the row selection logic refresh period occurs within the non-display update period.
2. The processing system of claim 1 , wherein the driver module is further configured for:
driving at least one common electrode of the plurality of common electrodes to update the first display line during the display update period.
3. The processing system of claim 1 , wherein driving the row selection logic during the row selection logic refresh period comprises:
updating the row selection logic based on a clock signal without driving the plurality of display lines for display updating.
4. The processing system of claim 1 , wherein the row selection logic comprises at least one dummy stage configured to share charge with a gate selection stage, wherein the gate selection stage is configured to select at least one display line for display updating.
5. The processing system of claim 1 , wherein driving the row selection logic during the row selection logic refresh period comprises:
updating the row selection logic based on a clock signal; and
driving a second display line of the plurality of display lines for display updating during the row selection logic refresh period.
6. The processing system of claim 1 , wherein the plurality of sensor electrodes comprises a plurality of transmitter electrodes and a plurality of receiver electrodes arranged in a row and column configuration, wherein at least one of the transmitter electrodes comprises a common electrode.
7. The processing system of claim 1 , wherein the plurality of sensor electrodes comprises the plurality of common electrodes arranged in a matrix.
8. The processing system of claim 1 , wherein the first display frame comprises a plurality of non-display update periods.
9. The processing system of claim 1 , wherein the non-display update period is sub-divided by the row selection logic refresh period into a first non-display update period and a second non-display update period, wherein the row selection logic refresh period has a shorter duration than the display update period.
10. An input device comprising a display device having a sensing device, the input device further comprising:
a plurality of sensor electrodes configured for capacitive sensing;
a plurality of display lines coupled to row selection logic;
a processing system configured to be coupled to the plurality of sensor electrodes and the plurality of display lines, the processing system configured for:
driving the row selection logic to select a first display line of the plurality of display lines for display updating during a display update period of a first display frame;
driving a first sensor electrode of the plurality of sensor electrodes for capacitive sensing during a non-display update period of the first display frame; and
driving the row selection logic during a row selection logic refresh period for display updating, wherein the row selection logic refresh period occurs within the non-display update period.
11. The input device of claim 10 , wherein driving the row selection logic during the row selection logic refresh period comprises:
updating the row selection logic based on a clock signal without driving the plurality of display lines for display updating.
12. The input device of claim 10 , wherein driving the row selection logic during the row selection logic refresh period comprises:
updating the row selection logic based on a clock signal; and
driving a second display line of the plurality of display lines for display updating during the row selection logic refresh period.
13. The input device of claim 10 , wherein the row selection logic comprises at least one dummy stage configured to share charge with a gate selection stage, wherein the gate selection stage is configured to select at least one display line for display updating.
14. The input device of claim 10 , wherein the plurality of sensor electrodes comprises a plurality of transmitter electrodes and a plurality of receiver electrodes arranged in a row and column configuration, wherein at least one of the plurality of sensor electrodes comprises a common electrode configured for display updating and capacitive sensing.
15. The input device of claim 10 , wherein the plurality of sensor electrodes comprises a plurality of common electrodes arranged in a matrix, wherein the plurality of common electrodes are configured for display updating and capacitive sensing.
16. The input device of claim 10 , wherein the non-display update period is sub-divided by the row selection logic refresh period into a first non-display update period and a second non-display update period, wherein the row selection logic refresh period has a shorter duration than the display update period.
17. A method of input sensing with a display device integrated with a sensing device having a plurality of display lines coupled to row selection logic, a plurality of sensor electrodes, the method comprising:
driving row selection logic of the display device to select a first display line of the plurality of display lines for display updating during a display update period of a first display frame;
driving a first sensor electrode of the plurality of sensor electrodes for capacitive sensing during a non-display update period of the first display frame; and
driving the row selection logic during a row selection logic refresh period for display updating, wherein the row selection logic refresh period occurs within the non-display update period.
18. The method of claim 17 , wherein each sensor electrodes comprises one or more common electrodes configured for display update and capacitive sensing, the method further comprising:
driving at least one common electrode to update the first display line during the display update period.
19. The method of claim 17 , wherein driving the row selection logic during the row selection logic refresh period comprises:
updating the row selection logic based on a clock signal without driving the plurality of display lines for display updating, wherein the row selection logic comprises at least one dummy stage configured to share charge with a gate selection stage, wherein the gate selection stage is configured to select at least one display line for display updating.
20. The method of claim 17 , wherein driving the row selection logic during the row selection logic refresh period comprises:
updating the row selection logic based on a clock signal; and
driving a second display line of the plurality of display lines for display updating during the row selection logic refresh period.