REDUCING DISPLAY ARTIFACTS AFTER NON-DISPLAY UPDATE PERIODS

• US 20140267217A1
• Filed: 03/13/2013
• Published: 09/18/2014
• Est. Priority Date: 03/13/2013
• Status: Active Grant

• Current Assignee: Synaptics Incorporated
• Original Assignee: Synaptics Incorporated
• Inventors: MACKIN, Thomas, LILLIE, Jeffrey S., CHILDS, John, BELL, Marshall J
• Granted Patent: US 8,970,577 B2
• Time in Patent Office: Days
• US Class Current: 345/214
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

Embodiments of the present invention generally provide a processing system for a display device having an integrated sensing device. The processing system includes a driver module coupled to a plurality of source lines and a plurality of transmitter electrodes. Each transmitter electrode includes one or more common electrodes configured for display updating and input sensing. The driver module is configured for selecting a first display line for display updating and driving the sources lines with first display update signals to update the first display line. The drive module is further configured for driving a first transmitter electrode of the plurality of transmitter electrodes for input sensing during a non-display update period and driving the source lines with restore signals during a restart period. The processing system further includes a receiver module coupled to a plurality of receiver electrodes and configured for receiving resulting signals with the receiver electrodes.

Claims

1. A processing system for a display device having an integrated sensing device, the processing system comprising:

a driver module comprising driver circuitry, the driver module coupled to a plurality of source lines and a plurality of transmitter electrodes, each transmitter electrode comprising one or more common electrodes configured for display updating and input sensing, the driver module configured for;

selecting a first display line for display updating during a first display update period;

driving the sources lines with first display update signals during the first display update period to update the first display line;

driving a first transmitter electrode of the plurality of transmitter electrodes for input sensing during a non-display update period; and

driving the source lines with restore signals during a restart period, wherein the restart period is after the non-display update period and before a second display update period; and

a receiver module coupled to a plurality of receiver electrodes and configured for receiving resulting signals with the receiver electrodes when the first transmitter electrode is driven for input sensing.

2. The processing system of claim 1, wherein the restore signals are based on the first display update signals.

3. The processing system of claim 1, wherein the restart period at least partially overlaps with the non-display update period.

4. The processing system of claim 1, wherein the restore signals comprise a reference voltage.

5. The processing system of claim 1, wherein driving the source lines with the restore signals comprises electrically floating the source lines.

6. The processing system of claim 1, wherein the driver module is further configured for:

selecting a second display line for display updating during a second display update period following the first display update period and before the non-display update period; and

driving the sources lines with second display update signals during the second display update period.

7. The processing system of claim 6, wherein the non-display update period is at least as long as a total display update period comprising the first display update period and the second display update period.

8. The processing system of claim 6, wherein the driver module is further configured for:

driving a first gate select line corresponding to the first display line during the first display update period; and

driving a second gate select line corresponding to a second display line during the second display update period, wherein driving the first gate select line is at least partially concurrent with driving the second gate select line.

9. The processing system of claim 6, wherein the restore signals comprise the first display update signals and the second display update signals, and driving the source lines with the restore signals comprises driving the sources lines with the first display update signals and then driving the source lines with the second display update signals.

10. The processing system of claim 1, wherein selecting the first common electrode for display updating comprises driving a select signal to a plurality of amorphous silicon transistors.

11. A method of input sensing with a display device integrated with a sensing device having a plurality of source lines, a plurality of receiver electrodes, and a plurality of transmitter electrodes, each transmitter electrode comprising one or more common electrodes, the method comprising:

selecting a first display line for display updating during a first display update period;

driving the sources lines with first display update signals during the first display update period to update the first display line;

driving a first transmitter electrode of the plurality of transmitter electrodes for input sensing during a non-display update period;

receiving resulting signals with the receiver electrodes when the first transmitter electrode is driven for input sensing;

driving the source lines with restore signals during a restart period, wherein the restart period is after the non-display update period and before a second display update period.

12. The method of claim 11, wherein the restore signals are based on the first display update signals.

13. The method of claim 11, wherein the restore signals comprise a reference voltage.

14. The method of claim 11, further comprising:

selecting a second display line for display updating during a second display update period following the first display update period and before the non-display update period; and

driving the sources lines with second display update signals during the second display update period.

15. The method of claim 14, further comprising:

driving a first gate select line corresponding to the first display line during the first display update period; and

driving a second gate select line corresponding to a second display line during the second display update period, wherein driving the first gate select line is at least partially concurrent with driving the second gate select line.

16. An input device comprising a display device having an integrated sensing device, the input device comprising:

a plurality of source lines;

a plurality of transmitter electrodes, each transmitter electrode comprising one or more common electrodes configured for display updating and input sensing;

a plurality of receiver electrodes; and

a processing system coupled to the source lines, transmitter electrodes, and receiver electrodes, the processing system configured to;

select a first display line for display updating during a first display update period;

drive the sources lines with first display update signals during the first display update period to update the first display line;

drive a first transmitter electrode of the plurality of transmitter electrodes for input sensing during a non-display update period;

receive resulting signals with the receiver electrodes when the first transmitter electrode is driven for input sensing; and

drive the source lines with restore signals during a restart period, wherein the restart period is after the non-display update period and before a second display update period.

17. The input device of claim 16, wherein the restore signals are based on the first display update signals.

18. The input device of claim 16, wherein the restore signals comprise a reference voltage.

19. The input device of claim 16, wherein the processing system is further configured to:

select a second display line for display updating during a second display update period following the first display update period and before the non-display update period; and

drive the sources lines with second display update signals during the second display update period.

20. The input device of claim 19, wherein the processing system is further configured to:

drive a first gate select line corresponding to the first display line during the first display update period; and

drive a second gate select line corresponding to a second display line during the second display update period, wherein driving the first gate select line is at least partially concurrent with driving the second gate select line.