Shifting carrier frequency to avoid interference
AssigneeSynaptics Incorporated
InventorJoseph Kurth Reynolds
Life of this patent
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Abstract
In a method of avoiding interference in an integrated capacitive sensor device and display device, a first transmitter signal having a first frequency is transmitted with a combination electrode of the integrated capacitive sensor device and display device. The combination electrode is configured for both capacitive sensing and display updating. A shift is made from transmitting the first transmitter signal with the combination electrode to transmitting a second transmitter signal with the combination electrode. The shift is made by changing a duration of at least one non-display update time period of the display device. The second transmitter signal has a second frequency, and the shifting occurs based at least in part upon an amount of interference.
Claims20
A method of avoiding interference in an integrated capacitive sensor device and display device, said method comprising:
- transmitting a first transmitter signal having a first frequency with a combination electrode of said integrated capacitive sensor device and display device, wherein said combination electrode is configured for both capacitive sensing and display updating;
- and
- shifting from transmitting said first transmitter signal with said combination electrode to transmitting a second transmitter signal with said combination electrode by changing a duration of at least one non-display update time period of said display device, wherein said second transmitter signal has a second frequency, and wherein said shifting occurs based at least in part upon an amount of interference.
A processing system communicatively coupled with a capacitive sensor device and a display device, said processing system comprising:
- transmitter circuitry configured for transmitting a first transmitter signal having a first frequency using a combination electrode, said combination electrode configured for both display updating and touch sensing;
- receiver circuitry configured for receiving a resulting signal using a receiver electrode of said capacitive sensor device, said resulting signal corresponds to said first transmitter signal;
- and
- a duration changer configured for changing a duration of at least one non-display update time period of said display device, wherein said change in duration causes a shift from transmitting said first transmitter signal with said combination electrode to transmitting a second transmitter signal with said combination electrode, wherein said second transmitter signal has a second frequency, wherein said change does not substantially change a refresh rate of said display device, and wherein said change occurs based at least in part upon an amount of interference.
A touch screen device comprising:
- a display device, said display device comprising a combination electrode configured for both display updating and touch sensing;
- a receiver electrode proximate said combination electrode, said receiver electrode configured for touch sensing;
- and
- a processing system communicatively coupled with said combination electrode and said receiver electrode, said processing system configured to:
- transmit a first transmitter signal having a first frequency using said combination electrode;
- receive a resulting signal using said receiver electrode, said resulting signal corresponds to said first transmitter signal;
- and
- change a duration of at least one non-display update time period of said display device, wherein said change in duration causes a shift from transmitting said first transmitter signal with said combination electrode to transmitting a second transmitter signal with said combination electrode, wherein said second transmitter signal has a second frequency, wherein said change does not substantially change a refresh rate of said display device, and wherein said change occurs based at least in part upon an amount of interference.
Dependencies are inferred from the claim text.