Methods and systems to regenerate H-sync by a touch controller

• US 9,645,676 B2
• Filed: 02/05/2015
• Issued: 05/09/2017
• Est. Priority Date: 02/05/2015
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Chen, Chung-Jen
• Primary Examiner(s): Spar, Ilana
• Assistant Examiner(s): HEYI, HENOK G
• Application Number:
  US14/615,055
• Publication Number:
  US 20160231859A1
• Time in Patent Office: 824 Days
• Field of Search: None
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/038 Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 5/12 Synchronisation between the display unit and other units, e.g. other display units, video-disc players

Abstract

Methods and systems to regenerate H-sync by a touch controller are described. In an embodiment, a method may include setting, using a processing device, a noise peak threshold for identifying a Horizontal Synchronization (H-Sync) signal generated by a display device. The method may also include determining, using the processing device, a frequency of the noise peaks that exceed the noise peak threshold. Additionally, the method may include selecting, using the processing device, an H-sync signal for regeneration by referencing a lookup table of H-sync signals with reference to the determined frequency of the noise peaks that exceed the noise peak threshold.

Claims

1. A method, comprising:

setting, using a processing device, a noise peak threshold for identifying a Horizontal Synchronization (H-Sync) signal generated by a display device;

determining, using the processing device, a frequency of noise peaks of noise generated by the display device that exceed the noise peak threshold; and

selecting, using the processing device, an H-sync signal for regeneration by referencing a lookup table of H-sync signals with reference to the determined frequency of the noise peaks that exceed the noise peak threshold.

2. The method of claim 1, further comprising receiving noise from the display device with a touch sensor.

3. The method of claim 2, further comprising converting the noise received by the touch sensor into a noise signal.

4. The method of claim 1, further comprising regenerating the selected H-sync signal.

5. The method of claim 1, further comprising synchronizing an active pen device with the selected H-sync signal.

6. The method of claim 5, wherein synchronizing the active pen device further comprises determining a working period for the active pen device in response to the selected H-sync signal.

7. The method of claim 6, wherein synchronizing the active pen device further comprises setting the working period for the active pen device to the time period between H-sync pulses defined by the selected H-sync signal.

9. The apparatus of claim 1, wherein the touch sensor is further configured to convert the received noise into a noise signal.

10. The apparatus of claim 1, wherein the processing device is further configured to regenerate the selected H-sync signal.

11. The apparatus of claim 1, wherein the processing device is further configured to synchronize with the selected H-sync signal.

12. The apparatus of claim 11, wherein the processing device is further configured to determine a working period in response to the selected H-sync signal.

13. The apparatus of claim 12, wherein the processing device is further configured to set the working period to the time period between H-sync pulses defined by the selected H-sync signal.

20. The method of claim 1, further comprising separating the noise peaks corresponding to the H-sync signal from other noise of the noise generated by the display device.

8. An apparatus, comprising:

a touch sensor configured to receive noise from a display device; and

a processing device coupled to the touch sensor, the processing device configured to;

set a noise peak threshold for identifying a Horizontal Synchronization (H-Sync) signal generated by a display device;

determine a frequency of noise peaks of the noise received from the display device that exceed the noise peak threshold; and

select an H-sync signal for regeneration by referencing a lookup table of H-sync signals with reference to the determined frequency of the noise peaks that exceed the noise peak threshold.

14. A system, comprising:

a display device having a predetermined Horizontal Synchronization (H-Sync) period, the H-sync comprising a plurality of H-sync pulses; and

an active pen device configured to interact with the display device, the active pen device comprising;

a touch sensor configured to receive noise from the display device; and

a processing device coupled to the touch sensor, the processing device configured to;

set a noise peak threshold for identifying a Horizontal Synchronization (H-Sync) signal generated by the display device;

determine a frequency of noise peaks of the noise received from the display device that exceed the noise peak threshold; and

select an H-sync signal for regeneration by referencing a lookup table of H-sync signals with reference to the determined frequency of the noise peaks that exceed the noise peak threshold.

15. The system of claim 14, wherein the touch sensor is further configured to convert the received noise into a noise signal.

16. The system of claim 14, wherein the processing device is further configured to regenerate the selected H-sync signal.

17. The system of claim 14, wherein the processing device is further configured to synchronize with the selected H-sync signal.

18. The system of claim 17, wherein synchronizing the active pen device further comprises determining a working period for the active pen device in response to the selected H-sync signal.

19. The system of claim 18, wherein synchronizing the active pen device further comprises setting the working period for the active pen device to the time period between H-sync pulses defined by the selected H-sync signal.