Reducing display artifacts after non-display update periods

• US 9,760,194 B2
• Filed: 03/02/2015
• Issued: 09/12/2017
• Est. Priority Date: 03/13/2013
• Status: Active Grant

• Current Assignee: Synaptics Incorporated
• Original Assignee: Synaptics Incorporated
• Inventors: Lillie, Jeffrey S., Childs, John, Bell, Jr., Marshall J., Mackin, Thomas
• Primary Examiner(s): Agustin, Peter Vincent
• Application Number:
  US14/635,913
• Publication Number:
  US 20160179232A1
• Time in Patent Office: 925 Days
• Field of Search: None
• 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 that includes driver circuitry, the driver module coupled to source lines and sensor electrodes. Each sensor electrode including one or more common electrodes configured for display updating and input sensing. The driver module is 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 sensor electrode of the plurality of sensor electrodes for capacitive sensing during a non-display update period, and operate the source lines in a restore mode during a restart period, wherein the restart period is after the non-display update period and before a second display update period.

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 sensor electrodes, each sensor electrode comprising one or more common electrodes configured for display updating and input sensing, the driver module 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 sensor electrode of the plurality of sensor electrodes for capacitive sensing during a non-display update period; and

operate the source lines in a restore mode during a restart period, wherein the restart period is after the non-display update period and before a second display update period.

2. The processing system of claim 1, wherein the driver module, when driving the first sensor electrode for capacitive sensing, is further configured to drive the first sensor electrode for absolute capacitive sensing.

3. The processing system of claim 1, wherein the driver module, when driving the first sensor electrode for capacitive sensing, is further configured to drive the first sensor electrode with a transmitter signal, and wherein the processing system further comprises a receiver module coupled to a plurality of receiver electrodes, the receiver module configured to receive resulting signals with the receiver electrodes when the first sensor electrode is driven the transmitter signal.

4. The processing system of claim 1, wherein the driver module, when operating the source lines in a restore mode, is further configured to drive the source lines with restore signals based on the first display update signals.

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

6. The processing system of claim 1, wherein the driver module, when operating the source lines in a restore mode, is further configured to drive the source lines with restore signals comprising a reference voltage.

7. The processing system of claim 1, wherein the driver module, when operating the source lines in a restore mode, is further configured to electrically float the source lines.

8. The processing system of claim 1, wherein the driver module 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.

9. The processing system of claim 8, wherein restore signals comprise the first display update signals and the second display update signals, and operating the source lines in a restore mode comprises driving the sources lines with the first display update signals and then driving the source lines with the second display update signals during the restart period.

10. The processing system of claim 1, wherein the non-display update period is at least as long as the first display update period.

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 sensor electrodes, each sensor 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 sensor electrode of the plurality of sensor electrodes for capacitive sensing during a non-display update period;

operating the source lines in a restore mode 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 driving the first sensor electrode for capacitive sensing comprises driving the first sensor electrode for absolute capacitive sensing.

13. The method of claim 11, wherein driving the first sensor electrode for capacitive sensing comprises driving the first sensor electrode with a transmitter signal and wherein the method further comprises receiving resulting signals with the receiver electrodes when the first sensor electrode is driven the transmitter signal.

14. The method of claim 11, wherein operating the source lines in the restore mode comprises driving the source lines with restore signals that are based on the first display update signals.

15. The method of claim 11, wherein operating the source lines in the restore mode comprises driving the source lines with restore signals that comprise a reference voltage.

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 sensor electrodes, each sensor electrode comprising one or more common electrodes configured for display updating and input sensing; and

a processing system coupled to the plurality source lines, the plurality of sensor 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 sensor electrode of the plurality of sensor electrodes for capacitive sensing during a non-display update period; and

operate the source lines in a restore mode 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 processing system, when operating source lines in the restore mode, is further configured to drive source lines with restore signals that are based on the first display update signals.

18. The input device of claim 16, wherein the processing system, when operating source lines in the restore mode, is further configured to at least one of drive source lines with a reference voltage and electrically float the source lines.

19. The input device of claim 16, wherein the processing system, when driving the first sensor electrode for capacitive sensing, is further configured to drive the first sensor electrode for absolute capacitive sensing.

20. The input device of claim 16, wherein the processing system, when driving the first sensor electrode for capacitive sensing, is further configured to drive the first sensor electrode with a transmitter signal, wherein the processing system is coupled to a second sensor electrode of the plurality of sensor electrode and wherein the processing system is configured to receive resulting signals with the second sensor electrode when the first sensor electrode is driven with the transmitter signal.