SIGNAL MEASURING METHOD AND DEVICE FOR TOUCH SCREEN

• US 20130321330A1
• Filed: 05/17/2013
• Published: 12/05/2013
• 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
• Granted Patent: US 9,823,768 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• 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:

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

determining a delay phase difference for each one or each set of driving electrodes;

sequentially providing a driving signal to each one or each set of the driving electrodes, the driving electrodes provided with the driving signal being mutual capacitively coupled with the sensing electrodes; and

each time the driving signal being provided, measuring a signal of at least one of the sensing electrodes being provided with the driving signal after delaying it by the delay phase difference corresponding to the one or the set of driving electrodes being provided with the driving signal.

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

sequentially selecting each one or each set of the 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 sensing electrodes is the sum of the signals measured from one of the sensing 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 sensing electrodes is the sum of the signals measured from at least two of the sensing electrodes.

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

selecting one or a set of the driving electrodes as basis electrodes and the other driving electrodes or the other sets 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 sensing electrodes is the sum of the signals measured from one of the sensing 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 sensing electrodes is the sum of the signals measured from at least two of the sensing electrodes.

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

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

regarding each one or each set of the driving electrodes and each intersecting one or a set of the sensing electrodes as a detecting combination;

determining a delay phase difference for each detecting combination;

sequentially providing a driving signal to each one or each set of the driving electrodes, the driving electrodes provided with the driving signal in the detecting combination provided with the driving signal being mutual capacitively coupled with the intersecting sensing electrodes; and

each time the driving signal being provided, measuring a signal of each detecting combination being provided with the driving signal after delaying it by the corresponding delay phase difference.

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 sensing electrodes arranged in parallel, the driving electrodes and the sensing 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 driving electrodes, the driving electrodes being provided with the driving signal being mutual capacitively coupled with the sensing electrodes, wherein each one or each set of the driving electrodes corresponds to a delay phase difference;

a detecting circuit for determining a delay phase difference for each one or each set of driving electrodes, and each time the driving signal being provided, measuring a signal of at least one of the sensing electrodes being provided with the driving signal after delaying it by the delay phase difference corresponding to the one or set of driving electrodes being provided with the driving signal.

12. The signal measuring device of claim 11, wherein the driving circuit further includes a means for sequentially selecting each one or each set of the driving electrodes as selected electrodes, and the detecting circuit further includes a means for 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.

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 sensing electrodes is the sum of the signals measured from one of the sensing 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 sensing electrodes is the sum of the signals measured from at least two of the sensing electrodes.

15. The signal measuring device of claim 11, wherein the driving circuit further includes a means for selecting one or a set of the driving electrodes as basis electrodes and the other driving electrodes or the other sets 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 sensing electrodes is the sum of the signals measured from one of the sensing 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 sensing electrodes is the sum of the signals measured from at least two of the sensing 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 sensing electrodes arranged in parallel, the driving electrodes and the sensing 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 driving electrodes, the driving electrodes being provided with the driving signal in the detecting combination being provided with the driving signal being mutual capacitively coupled with the intersecting sensing electrodes, wherein each one or each set of the driving electrodes and each intersecting one or a set of the sensing electrodes is regarded as a detecting combination, and each detecting combination corresponds to a delay phase difference; and

a detecting circuit for measuring a signal of each detecting combination being provided with the driving signal after delaying it by the corresponding delay phase difference each time the driving signal is provided.

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.