Capacitive panel scanning with reduced number of sensing circuits
AssigneeCypress Semiconductor Corporation
InventorsViktor Kremin, Roman Ogirko
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Abstract
Embodiments described herein provide capacitive sensor devices and methods for operating capacitive sensor devices. A first number of electrodes on the capacitive sensor array is activated. A signal is received from each of the first number of electrodes with a second number of receiver circuits on a controller associated with the capacitive sensor array. The first number is greater than the second number. It is determined if an object is proximate the capacitive sensor array based on the signals received from the first number of electrodes.
Claims20
A method for operating a capacitive sensor array comprising:
- receiving a signal from each of a first number of electrodes with a second number of receiver circuits on a controller associated with the capacitive sensor array, wherein the first number is greater than the second number;
- and
- determining if an object is proximate the capacitive sensor array based on the signals received from the first number of electrodes.
A capacitive sensor device comprising:
- a capacitive sensor array comprising a plurality of capacitive sensors;
- and
- a controller coupled to the capacitive sensor array and comprising a first number of receiver channels, the controller being configured to:
- activate a second number of the plurality of electrodes on the capacitive sensor array, wherein the second number is greater than the first number;
- receive a signal from each of the second number of electrodes with the first number of receiver channel;
- and
- determine if an object is proximate the capacitive sensor array based on the signals received from the second number of the plurality of electrodes.
A method for operating a capacitive sensor array comprising:
- activating a first number of electrodes on the capacitive sensor array, wherein the capacitive sensor array comprises a plurality of transmitter electrodes and a plurality of receiver electrodes, and the first number of electrodes comprises all of the receiver electrodes;
- receiving a signal from each of the first number of electrodes with a second number of receiver channels on a controller associated with the capacitive sensor array, wherein the first number is greater than the second number;
- and
- determining if an object is proximate the capacitive sensor array based on the signals received from the first number of electrodes, wherein the determining if the object is within a predetermined proximity of the capacitive sensor array comprises adjusting the polarity of at least some of the signals received from the first number of electrodes.
Dependencies are inferred from the claim text.