System and method for sensing multiple input objects with gradient sensor devices
First Claim
1. A gradient sensor device comprising:
- a transmitter electrode;
a receiver electrode; and
a processing system communicatively coupled to the transmitter electrode and the receiver electrode, the processing system configured to;
drive the transmitter electrode with a first drive signal to produce a first voltage gradient across the transmitter electrode, wherein the first voltage gradient is non-linear;
drive the transmitter electrode with a second drive signal to produce a second voltage gradient;
drive the transmitter electrode with a third drive signal to produce a third voltage gradient;
drive the transmitter electrode with a fourth drive signal to produce a fourth voltage gradient;
receive a resulting signal with the receiver electrode, the resulting signal comprising effects of the first voltage gradient, the second voltage gradient, the third voltage gradient, and the fourth voltage gradient; and
determine positional information for a plurality of input objects located simultaneously within a sensing region along the transmitter electrode based on the resulting signal,wherein the first voltage gradient, the second voltage gradient, the third voltage gradient, and the fourth voltage gradient each have a shape corresponding to a respective polynomial of degree greater than or equal to one, andwherein at least two of the degrees of the respective polynomials are different.
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Abstract
A processing system for an input device includes a transmitter module including transmitter circuitry, a receiver module, and a determination module. The transmitter module is configured to drive the transmitter electrode with a first drive signal to produce a first voltage gradient across the transmitter electrode, wherein the first voltage gradient is non-linear. The receiver module is configured to receive a first resulting signal with a receiver electrode, the resulting signal comprising effects of the first voltage gradient. The determination module is configured to determine positional information for a plurality input objects located simultaneously within a sensing region along the transmitter electrode based on the first resulting signal.
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Citations
11 Claims
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1. A gradient sensor device comprising:
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a transmitter electrode; a receiver electrode; and a processing system communicatively coupled to the transmitter electrode and the receiver electrode, the processing system configured to; drive the transmitter electrode with a first drive signal to produce a first voltage gradient across the transmitter electrode, wherein the first voltage gradient is non-linear; drive the transmitter electrode with a second drive signal to produce a second voltage gradient; drive the transmitter electrode with a third drive signal to produce a third voltage gradient; drive the transmitter electrode with a fourth drive signal to produce a fourth voltage gradient; receive a resulting signal with the receiver electrode, the resulting signal comprising effects of the first voltage gradient, the second voltage gradient, the third voltage gradient, and the fourth voltage gradient; and determine positional information for a plurality of input objects located simultaneously within a sensing region along the transmitter electrode based on the resulting signal, wherein the first voltage gradient, the second voltage gradient, the third voltage gradient, and the fourth voltage gradient each have a shape corresponding to a respective polynomial of degree greater than or equal to one, and wherein at least two of the degrees of the respective polynomials are different. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A processing system for an input device, the processing system comprising:
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a transmitter module including transmitter circuitry, the transmitter module configured to; drive a transmitter electrode with a first drive signal to produce a first voltage gradient across the transmitter electrode, wherein the first voltage gradient is non-linear, drive the transmitter electrode with a second drive signal to produce a second voltage gradient, drive the transmitter electrode with a third drive signal to produce a third voltage gradient, and drive the transmitter electrode with a fourth drive signal to produce a fourth voltage gradient, wherein the first voltage gradient, the second voltage gradient, the third voltage gradient, and the fourth voltage gradient each have a shape corresponding to a respective polynomial of degree greater than or equal to one, and wherein at least two of the degrees of the respective polynomials are different; a receiver module, the receiver module configured to receive a resulting signal with a receiver electrode, the resulting signal comprising effects of the first voltage gradient, the second voltage gradient, the third voltage gradient, and the fourth voltage gradient; and a determination module determining positional information for a plurality input objects located simultaneously within a sensing region along the transmitter electrode based on the resulting signal. - View Dependent Claims (8, 9)
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10. A method of capacitive sensing, the method comprising:
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driving a transmitter electrode with a first drive signal to produce a first voltage gradient across the transmitter electrode, wherein the first voltage gradient is non-linear; driving the transmitter electrode with a second drive signal to produce a second voltage gradient; driving the transmitter electrode with a third drive signal to produce a third voltage gradient; driving the transmitter electrode with a fourth drive signal to produce a fourth voltage gradient; receiving a resulting signal with a receiver electrode, the resulting signal comprising effects of the first voltage gradient, the second voltage gradient, the third voltage gradient, and the fourth voltage gradient; and determining positional information for a plurality input objects located simultaneously within a sensing region along the transmitter electrode based on the resulting signal, wherein the first voltage gradient, the second voltage gradient, the third voltage gradient, and the fourth voltage gradient each have a shape corresponding to a respective polynomial of degree greater than or equal to one, and wherein at least two of the degrees of the respective polynomials are different. - View Dependent Claims (11)
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Specification