Transcapacitive sensor using transmit on gate lines
AssigneeSynaptics Incorporated
InventorsStephen L. MOREIN, Petr SHEPELEV, Joseph Kurth REYNOLDS, Jeffrey LUKANC
Life of this patent
Estimating the term…
Abstract
Capacitive sensing is performed in an input device having an input sensor and associated display device using gate lines of the display device. A transmitter signal having a negative pulse is used to safely transmit a transcapacitive transmitter signal while not opening any of the access transistors in the display device.
Claims23
An input device comprising a display device comprising an integrated sensing device:
- a plurality of transmitter electrodes including a first transmitter electrode, wherein each transmitter electrode comprises one or more gate lines of the display device, wherein the gate lines are configured for display updating and capacitive sensing;
- a plurality of receiver electrodes;
- and
- a processing system coupled to the plurality of transmitter electrodes and to the plurality of receiver electrodes, and configured to:
- drive a transmitter signal with the first transmitter electrode for capacitive sensing, wherein the transmitter signal comprises a maximum amplitude that is below a display update turn-on voltage for the plurality of gate lines, and
- receive resulting signals with the plurality of receiver electrodes, the resulting signals comprising effects corresponding to the transmitter signal.
A processing system configured to drive an input device comprising a display device comprising an integrated sensing device, the processing system comprising:
- a transmitter module configured to be coupled to a plurality of transmitter electrodes, wherein each transmitter electrode comprises one or more gate lines of the display device, wherein the gate lines are configured for display updating and capacitive sensing, wherein the transmitter module is configured to drive a transmitter signal with the first transmitter electrode for capacitive sensing, wherein the transmitter signal comprises a maximum amplitude that is below a display update turn-on voltage for the plurality of gate lines;
- and
- a receiver module configured to be coupled to a plurality of receiver electrodes and configured to receive resulting signals with the plurality of receiver electrodes, the resulting signals comprising effects corresponding to the transmitter signal.
A method for detecting presence of an input object using a capacitive sensing device, the method comprising:
- driving a transmitter signal with at least one of a plurality of transmitter electrodes, wherein each transmitter electrode comprises one or more gate lines of the display device, wherein the gate lines are configured for display updating and capacitive sensing, wherein the transmitter signal comprises a maximum amplitude that is below a display update turn-on voltage for the plurality of gate lines;
- and
- receiving resulting signals with a plurality of receiver electrodes, the resulting signals comprising effects corresponding to the transmitter signal.
Dependencies are inferred from the claim text.