METHOD AND APPARATUS FOR IMPROVED INPUT SENSING USING A DISPLAY PROCESSOR REFERENCE SIGNAL
First Claim
1. An input device, comprising:
- a plurality of transmitter electrodes comprising a plurality of common electrodes configured to operate in a first mode for capacitive sensing and configured to operate in a second mode for updating a display device;
a plurality of receiver electrodes;
a display processor coupled to the plurality of transmitter electrodes and configured to drive at least one of the transmitter electrodes with a transmitter signal for capacitive sensing; and
a sensor processor coupled to the plurality of receiver electrodes and configured to receive resulting signals with the plurality of receiver electrodes when at least one of the common electrodes are driven for capacitive sensing, wherein the sensor processor comprises one or more receiver channels, and wherein each of the one or more receiver channels is coupled to a receiver electrode of the plurality of receiver electrodes, and each of the one or more receiver channels have;
a first receiver channel input port configured to receive at least a portion of the resulting signals; and
a second receiver channel input port configured to receive a sensor processor reference signal that is based on a display processor reference signal,wherein each of the one or more receiver channels is configured to provide an output signal based on a comparison of the at least a portion of the resulting signals and the sensor processor reference signal.
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Accused Products
Abstract
Embodiments of the invention generally provide a method and apparatus that is configured to reduce the effects of interference that is undesirably provided to a transmitter signal that is delivered from a transmitter signal generating device to a sensor processor to determine if an input object is disposed within a touch sensing region of a touch sensing device. In one embodiment, the sensor processor includes a receiver channel that has circuitry that is configured to separately receive a transmitter signal delivered from a display processor and a sensor processor reference signal that is based on a display processor reference signal to reliably sense the presence of an object. Embodiments of the invention described herein thus provide an improved apparatus and method for reliably sensing the presence of an object by a touch sensing device.
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Citations
33 Claims
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1. An input device, comprising:
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a plurality of transmitter electrodes comprising a plurality of common electrodes configured to operate in a first mode for capacitive sensing and configured to operate in a second mode for updating a display device; a plurality of receiver electrodes; a display processor coupled to the plurality of transmitter electrodes and configured to drive at least one of the transmitter electrodes with a transmitter signal for capacitive sensing; and a sensor processor coupled to the plurality of receiver electrodes and configured to receive resulting signals with the plurality of receiver electrodes when at least one of the common electrodes are driven for capacitive sensing, wherein the sensor processor comprises one or more receiver channels, and wherein each of the one or more receiver channels is coupled to a receiver electrode of the plurality of receiver electrodes, and each of the one or more receiver channels have; a first receiver channel input port configured to receive at least a portion of the resulting signals; and a second receiver channel input port configured to receive a sensor processor reference signal that is based on a display processor reference signal, wherein each of the one or more receiver channels is configured to provide an output signal based on a comparison of the at least a portion of the resulting signals and the sensor processor reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A sensor processor for an input device, comprising:
a sensor circuitry coupled to a plurality of sensor electrodes, wherein the sensor processor is coupled to a display processor that is configured to drive a plurality of common electrodes for updating a display device, wherein the sensor processor comprises at least one receiver channel configured to receive resulting signals with at least one of the plurality of sensor electrodes and to receive a sensor processor reference signal that is based on a display processor reference signal, and wherein the receiver channel is further configured to provide an receiver channel output signal based on at least a portion of the received resulting signals and the sensor processor reference signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A processing system for an input device, the processing system comprising:
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a display processor configured to drive a plurality of common electrodes for updating a display device, the display processor comprising a display processor reference signal, a sensor processor configured to receive resulting signals from a plurality of sensor electrodes, wherein the sensor processor comprises a reference channel configured generate a first reference channel output signal at least partially based on the display processor reference signal, wherein the processing system is configured to determine positional information for an input object in a sensing region of the input device at least based in part on the resulting signals and the first reference channel output signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of sensing an input object in a sensing region of an input device, comprising:
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driving a display update on at least one of a plurality of common electrodes, the common electrodes configured for capacitive sensing and updating a display device; driving a transmitter signal onto at least one of a plurality of common electrodes; receiving a resulting signal from one or more receiver electrodes, wherein the resulting signal comprises effects corresponding to the transmitter signal; and comparing the resulting signal with a sensor processor reference signal that is based on a display processor reference signal. - View Dependent Claims (30, 31, 32, 33)
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Specification