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1. (WO2019005361) COMPENSATION D'ERREUR DE PHASE DANS DES SYSTÈMES À CORRÉLATEUR UNIQUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. A method for time synchronizing a touch screen display with a stylus, comprising: receiving, at a digitizer of the touch screen display, a downlink signal from the stylus associated with the touch screen display;

determining, at the digitizer, a timing misalignment between the touch screen display and the stylus by measuring self-capacitance of a sensel electrode on the touch screen display based on the downlink signal; and

adjusting, at the digitizer, a sampling window to compensate for the timing misalignment.

2. The method of claim 1, wherein determining the timing misalignment between the touch screen display and the stylus comprises:

generating, at the digitizer, an uplink signal for transmission during a first time period; and

transmitting the uplink signal from the digitizer to the sensel electrode of the touch screen display.

3. The method of claim 2, further comprising:

measuring an electric current (/') flow of electric charge into the sensel electrode during a second time period;

calculating a delay in time from the first time period to the second time period; and adjusting a subsequent sampling window for transmissions of the uplink signal based on the delay.

4. The method of claim 3, wherein calculating the delay in time from the first time period to the second time period comprises:

correlating a waveform of the uplink signal against a reference waveform to identify a phase at which correlation is maximized.

5. The method of claim 1, wherein receiving the downlink signal from the stylus associated with the touch screen display, comprises:

receiving a first downlink signal from the stylus during a first time slot; and receiving a second downlink signal from the stylus during a second time slot, wherein the second downlink signal is 90 degrees delayed from the first downlink signal.

6. The method of claim 5, further comprising:

correlating an uplink signal for transmission against a quadrature signal of one of the first downlink signal or the second downlink signal; and

adjusting a subsequent sampling window for transmissions of the uplink signal at the digitizer based on the correlation.

7. The method of claim 1, wherein the downlink signal is received from the stylus by measuring an electric current (/') flow of electric charge into the sensel electrode when the stylus applies voltage to electrodes located on a tip of the stylus.

8. The method of claim 1, wherein the touch screen display is an in-cell touch screen.

9. A touch screen display, comprising:

a digitizer;

a memory coupled to the digitizer, wherein the memory includes instructions executable by the digitizer to:

receive, at the digitizer of the touch screen display, a downlink signal from a stylus associated with the touch screen display;

determine, at the digitizer, a timing misalignment between the touch screen display and the stylus by measuring self-capacitance of a sensel electrode on the touch screen display based on the downlink signal; and

adjust, at the digitizer, a sampling window to compensate for the timing misalignment.

10. The touch screen display of claim 9, wherein the instructions to determine the timing misalignment between the touch screen display and the stylus further includes instructions executable by the digitizer to:

generate, at the digitizer, an uplink signal for transmission during a first time period; and

transmit the uplink signal from the digitizer to the sensel electrode of the touch screen display.

11. The touch screen display of claim 10, wherein the instructions are further executable by the digitizer to:

measure an electric current (/') flow of electric charge into the sensel electrode during a second time period;

calculate a delay in time from the first time period to the second time period; and adjust a subsequent sampling window for transmissions of the uplink signal based on the delay.

12. The touch screen display of claim 11, wherein the instructions to calculate the delay in time from the first time period to the second time period are further executable by the digitizer to:

correlate a waveform of the uplink signal against a reference waveform to identify a phase at which correlation is maximized.

13. The touch screen display of claim 9, wherein the instructions to receive the downlink signal from the stylus associated with the touch screen display are further executable by the digitizer to:

receive a first downlink signal from the stylus during a first time slot; and receive a second downlink signal from the stylus during a second time slot, wherein the second downlink signal is 90 degrees delayed from the first downlink signal.

14. The touch screen display of claim 13, wherein the instructions are further executable by the digitizer to:

correlate an uplink signal for transmission against a quadrature signal of one of the first downlink signal or the second downlink signal; and

adjust a subsequent sampling window for transmissions of the uplink signal at the digitizer based on the correlation.

15. A computer-readable medium storing computer-executable instructions executable by a processor for time synchronizing a touch screen display with a stylus according to the methods of any of claims 1 to 8.