Signal measuring method and device for touch screen

• US 9,823,768 B2
• Filed: 05/17/2013
• Issued: 11/21/2017
• Est. Priority Date: 05/18/2012
• Status: Active Grant

• Current Assignee: eGalax_eMPIA Technology Inc.
• Original Assignee: eGalax_eMPIA Technology Inc.
• Inventors: Chang, Chin-Fu
• Primary Examiner(s): Rosario, Nelson
• Assistant Examiner(s): Lin, Chun-Nan
• Application Number:
  US13/896,423
• Publication Number:
  US 20130321330A1
• Time in Patent Office: 1,649 Days
• Field of Search: 345173
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

Each one or each set of driving electrodes of a touch screen corresponds to a delay phase difference. Whenever a driving signal is provided to one or a set of the driving electrodes, a signal on at least one of sensing electrodes of the touch screen is measured after being delayed by the delay phase difference corresponding to the one or the set of the driving electrodes being provided with the driving signal.

Claims

1. A signal measuring method for a touch screen comprising:

determining a delay phase difference for each one or each set of a plurality of driving electrodes of a touch screen comprising a plurality of detecting electrodes, wherein the delay phase difference is a phase difference between a mutual capacitive coupling signal outputted from each one of the plurality of detecting electrodes and a driving signal inputted to said each one or each set of the plurality of driving electrodes; and

delaying a mutual capacitive coupling detection of all of the plurality of detecting electrodes for the delay phase difference when the driving signal is inputted to said each one or each set of the plurality of driving electrodes.

2. The signal measuring method of claim 1, wherein determining a delay phase difference for each one or each set of the plurality of driving electrodes includes:

sequentially selecting each one or each set of the plurality of driving electrodes as selected electrodes; and

selecting a delay phase difference for the selected electrodes from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected electrodes, the signal measured after delaying by the delay phase difference is larger than the signals measured after delaying by other predetermined phase differences.

3. The signal measuring method of claim 2, wherein when the driving signal is provided to the selected electrodes, the signal measured from a plurality of the detecting electrodes is the sum of the signals measured from one of the plurality of detecting electrodes.

4. The signal measuring method of claim 2, wherein when the driving signal is provided to the selected electrodes, the signal measured from a plurality of the detecting electrodes is the sum of the signals measured from at least two of the plurality of detecting electrodes.

5. The signal measuring method of claim 1, wherein determining a delay phase difference for each one or each set of the plurality of driving electrodes includes:

selecting one or a set of the plurality of driving electrodes as basis electrodes and the other of the plurality of driving electrodes or the other sets of the plurality of driving electrodes as non-basis electrodes;

selecting a delay phase difference for the basis electrodes from a plurality of predetermined phase differences, wherein when the driving signal is provided to the basis electrodes, the signal measured after delaying by the delay phase difference is larger than the signals measured after delaying by other predetermined phase differences;

using the signal measured for the basis electrodes after delaying by the delay phase difference as a basis signal;

sequentially selecting each one or each set of the non-basis electrodes as selected electrodes; and

selecting a delay phase difference for the selected electrodes from the plurality of predetermined phase differences, wherein when the driving signal is provided to the selected electrodes, the signal measured after delaying by the delay phase difference is closest to the basis signal than the signals measured after delaying by other predetermined phase differences.

6. The signal measuring method of claim 5, wherein when the driving signal is provided to the basis electrodes or the selected electrodes, the signal measured from a plurality of the detecting electrodes is the sum of the signals measured from one of the plurality of detecting electrodes.

7. The signal measuring method of claim 5, wherein when the driving signal is provided to the basis electrodes or the selected electrodes, the signal measured from a plurality of the detecting electrodes is the sum of the signals measured from at least two of the plurality of detecting electrodes.

8. A signal measuring method for a touch screen comprising:

regarding each one or each set of a plurality of driving electrodes and each intersecting one or a set of a plurality of detecting electrodes of a touch screen as a detecting combination, wherein the delay phase difference is a phase difference between a mutual capacitive coupling signal outputted from each one of the plurality of detecting electrodes and a driving signal inputted to said each one or each set of the plurality of driving electrodes;

determining a delay phase difference for each detecting combination; and

delaying a mutual capacitive coupling detection of all of the plurality of detecting electrodes for the delay phase difference when the driving signal is inputted to said each one or each set of the plurality of driving electrodes.

9. The signal measuring method of claim 8, wherein determining a delay phase difference for each detecting combination includes:

sequentially selecting each one of the detecting combinations as a selected detecting combination; and

selecting a delay phase difference for the selected detecting combination from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected detecting combination, the signal measured after delaying by the delay phase difference is larger than the signals measured after delaying by other predetermined phase differences.

10. The signal measuring method of claim 8, wherein determining a delay phase difference for each detecting combination includes:

selecting one of the detecting combinations as a selected detecting combination, and the other detecting combinations as non-basis detecting combinations;

selecting a delay phase difference for the basis detecting combination from a plurality of predetermined phase differences, wherein when the driving signal is provided to the basis detecting combination, the signal measured after delaying by the delay phase difference is larger than the signals measured after delaying by other predetermined phase differences;

using the signal measured for the basis detecting combination after delaying by the delay phase difference as a basis signal;

sequentially selecting each one of the non-basis detecting combinations as a selected detecting combination; and

selecting a delay phase difference for the selected detecting combination from the plurality of predetermined phase differences, wherein when the driving signal is provided to the selected detecting combination, the signal measured after delaying by the delay phase difference is closest to the basis signal than the signals measured after delaying by other predetermined phase differences.

11. A signal measuring device for a touch screen comprising:

a touch screen including a plurality of electrodes comprising a plurality of driving electrodes arranged in parallel and a plurality of detecting electrodes arranged in parallel, the driving electrodes and the detecting electrodes intersecting one another at a plurality of intersections;

a driving circuit for sequentially providing a driving signal to each one or each set of the plurality of driving electrodes, the plurality of driving electrodes being provided with the driving signal being mutual capacitive coupled with the plurality of detecting electrodes, wherein each one or each set of the plurality of driving electrodes corresponds to a delay phase difference;

a detecting circuit for determining the delay phase difference for each one or each set of the plurality of driving electrodes, and delaying a mutual capacitive coupling detection of all of the plurality of detecting electrodes for the delay phase difference when the driving signal is inputted to said each one or each set of the plurality of driving electrodes, wherein the delay phase difference is a phase difference between a mutual capacitive coupling signal outputted from each one of the plurality of detecting electrodes and a driving signal inputted to said each one or each set of the plurality of driving electrodes.

12. The signal measuring device of claim 11, wherein the driving circuit further sequentially selects each one or each set of the plurality of driving electrodes as selected electrodes, and the detecting circuit further selects a delay phase difference for the selected electrodes from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected electrodes, the signal measured after delaying by the delay phase difference is larger than the signals measured after delaying by other predetermined phase differences.

13. The signal measuring device of claim 12, wherein when the driving signal is provided to the selected electrodes, the signal measured from a plurality of the detecting electrodes is the sum of the signals measured from one of the plurality of detecting electrodes.

14. The signal measuring device of claim 12, wherein when the driving signal is provided to the selected electrodes, the signal measured from a plurality of the detecting electrodes is the sum of the signals measured from at least two of the plurality of detecting electrodes.

15. The signal measuring device of claim 11, wherein the driving circuit further selects one or a set of the plurality of driving electrodes as basis electrodes and the other of the plurality of driving electrodes or the other sets of the plurality of driving electrodes as non-basis electrodes, and the driving circuit sequentially selects each one or each set of the non-basis electrodes as selected electrodes;

the detecting circuit selects a delay phase difference for the basis electrodes from a plurality of predetermined phase differences, wherein when the driving signal is provided to the basis electrodes, the signal measured after delaying by the delay phase difference is larger than the signals measured after delaying by other predetermined phase differences, and the detecting circuit uses the signal measured for the basis electrodes after delaying by the delay phase difference as a basis signal, and selects a delay phase difference for the selected electrodes from the plurality of predetermined phase differences, wherein when the driving signal is provided to the selected electrodes, the signal measured after delaying by the delay phase difference is closest to the basis signal than the signals measured after delaying by other predetermined phase differences.

16. The signal measuring device of claim 15, wherein when the driving signal is provided to the basis electrodes or the selected electrodes, the signal measured from a plurality of the detecting electrodes is the sum of the signals measured from one of the plurality of detecting electrodes.

17. The signal measuring device of claim 15, wherein when the driving signal is provided to the basis electrodes or the selected electrodes, the signal measured from a plurality of the detecting electrodes is the sum of the signals measured from at least two of the plurality of detecting electrodes.

18. A signal measuring device for a touch screen comprising:

a touch screen including a plurality of electrodes comprising a plurality of driving electrodes arranged in parallel and a plurality of detecting electrodes arranged in parallel, the driving electrodes and the detecting electrodes intersecting one another at a plurality of intersections;

a driving circuit for sequentially providing a driving signal to each one or each set of the plurality of driving electrodes, the plurality of driving electrodes being provided with the driving signal in each one of the plurality of detecting combination being provided with the driving signal being mutual capacitive coupled with the intersecting sensing of the plurality of detecting electrodes, wherein each one or each set of the plurality of driving electrodes and each intersecting one or a set of the plurality of detecting electrodes is regarded as a detecting combination, and each detecting combination corresponds to a delay phase difference; and

a detecting circuit for determining the delay phase difference for each one or each set of the plurality of driving electrodes, and delaying a mutual capacitive coupling detection of all of the plurality of detecting electrodes for the delay phase difference when the driving signal is inputted to said each one or each set of the plurality of driving electrodes, wherein the delay phase difference is a phase difference between a mutual capacitive coupling signal outputted from each one of the plurality of detecting electrodes and a driving signal inputted to said each one or each set of the plurality of driving electrodes.

19. The signal measuring device of claim 18, wherein the driving circuit sequentially selects each one of the detecting combinations as a selected detecting combination, and the detecting circuit selects a delay phase difference for the selected detecting combination from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected detecting combination, the signal measured after delaying by the delay phase difference is larger than the signals measured after delaying by other predetermined phase differences.

20. The signal measuring device of claim 18, wherein the driving circuit selects one of the detecting combinations as a basis detecting combination, and the other detecting combinations as non-basis detecting combinations, and the driving circuit sequentially selects each one of the detecting combinations as a selected detecting combination;

and the detecting circuit selects a delay phase difference for the basis detecting combination from a plurality of predetermined phase differences, wherein when the driving signal is provided to the basis detecting combination, the signal measured after delaying by the delay phase difference is larger than the signals measured after delaying by other predetermined phase differences, and the detecting circuit uses the signal measured for the basis detecting combination after delaying by the delay phase difference as a basis signal, and selects a delay phase difference for the selected detecting combination from the plurality of predetermined phase differences, wherein when the driving signal is provided to the selected detecting combination, the signal measured after delaying by the delay phase difference is closest to the basis signal than the signals measured after delaying by other predetermined phase differences.