Sensing system and method to perform temperature stable profile sensing
A method for performing a reconstructed temperature stable profile sensing scheme is provided. The method comprises: based on driving a first subset of a plurality of electrodes, obtaining first resulting signals from a second subset of the plurality of electrodes; based on driving both the first subset and the second subset of the plurality of electrodes, obtaining second resulting signals from the second subset of the plurality of electrodes; determining a reconstructed temperature stable profile based on a mutual capacitance sensing profile associated with the first resulting signals, an absolute capacitance sensing (ABS) profile associated with the second resulting signals, and a reconstructed temperature stable parameter; and performing object detection based on the reconstructed temperature stable profile.
1 . A method for performing a reconstructed temperature stable profile sensing scheme, comprising:
based on driving a first subset of a plurality of electrodes, obtaining first resulting signals from a second subset of the plurality of electrodes;
based on driving both the first subset and the second subset of the plurality of electrodes, obtaining second resulting signals from the second subset of the plurality of electrodes;
obtaining a first temperature coefficient associated with an absolute capacitance sensing (ABS) profile and a second temperature coefficient associated with a mutual capacitance sensing profile;
calculating a reconstructed temperature stable parameter based on the first temperature coefficient and the second temperature coefficient;
determining a reconstructed temperature stable profile based on the mutual capacitance sensing profile associated with the first resulting signals, the ABS profile associated with the second resulting signals, and the reconstructed temperature stable parameter; and
performing object detection based on the reconstructed temperature stable profile.
2 . The method of claim 1 ,
wherein the reconstructed temperature stable parameter indicates a ratio associated with the mutual capacitance sensing profile and the ABS profile.
3 . The method of claim 1 , wherein determining the reconstructed temperature stable profile is based on the below:
C p =C b −αC t
where C p is the reconstructed temperature stable profile, C b is the ABS profile, C t is the mutual capacitance sensing profile, and α is the reconstructed temperature stable parameter.
4 . The method of claim 3 , wherein the reconstructed temperature stable parameter α is based on the below:
α
=
k
b
C
b
k
t
C
t
where k b is the first temperature coefficient that is associated with the ABS profile and k t is the second temperature coefficient that is associated with the mutual capacitance sensing profile.
5 . The method of claim 1 , wherein obtaining the first resulting signals comprises:
driving the first subset of the plurality of electrodes using a transmitter voltage;
driving the second subset of the plurality of electrodes using a pre-defined voltage that is different from the transmitter voltage; and
obtaining the first resulting signals based on driving the first subset of the plurality of electrodes using the transmitter voltage and driving the second subset of the plurality of electrodes using the pre-defined voltage.
6 . The method of claim 5 , wherein obtaining the second resulting signals comprises:
driving the first subset of the plurality of electrodes and the second subset of the plurality of electrodes using a same voltage; and
obtaining the second resulting signals based on driving the first subset of the plurality of electrodes and the second subset of the plurality of electrodes using the same voltage.
7 . The method of claim 1 , wherein obtaining the first resulting signals comprises obtaining the first resulting signals from the second subset of the plurality of electrodes in a first capacitive frame, and wherein obtaining the second resulting signals comprises obtaining the second resulting signals from the second subset of the plurality of electrodes in a second capacitive frame that is subsequent to the first capacitive frame.
8 . The method of claim 1 , wherein performing the object detection comprises:
obtaining a second reconstructed temperature stable profile based on a second mutual capacitance sensing profile, a second ABS profile, and the reconstructed temperature stable parameter; and
detecting a location of an input object based on the reconstructed temperature stable profile and the second reconstructed temperature stable profile.
9 . An input device for performing a reconstructed temperature stable profile sensing scheme, comprising:
a plurality of electrodes; and
a processing system configured to:
based on driving a first subset of the plurality of electrodes, obtain first resulting signals from a second subset of the plurality of electrodes;
based on driving both the first subset and the second subset of the plurality of electrodes, obtain second resulting signals from the second subset of the plurality of electrodes;
obtain a first temperature coefficient associated with an absolute capacitance sensing (ABS) profile and a second temperature coefficient associated with a mutual capacitance sensing profile;
calculate a reconstructed temperature stable parameter based on the first temperature coefficient and the second temperature coefficient;
determine a reconstructed temperature stable profile based on the mutual capacitance sensing profile associated with the first resulting signals, the ABS profile associated with the second resulting signals, and the reconstructed temperature stable parameter; and
perform object detection based on the reconstructed temperature stable profile.
10 . The input device of claim 9 ,
wherein the reconstructed temperature stable parameter indicates a ratio associated with the mutual capacitance sensing profile and the ABS profile.
11 . The input device of claim 9 , wherein determining the reconstructed temperature stable profile is based on the below:
C p =C b −αC t
where C p is the reconstructed temperature stable profile, C b is the ABS profile, C t is the mutual capacitance sensing profile, and α is the reconstructed temperature stable parameter.
12 . The input device of claim 11 , wherein the reconstructed temperature stable parameter α is based on the below:
α
=
k
b
C
b
k
t
C
t
where k b is the first temperature coefficient that is associated with the ABS profile and k t is the second temperature coefficient that is associated with the mutual capacitance sensing profile.
13 . The input device of claim 9 , wherein obtaining the first resulting signals comprises:
driving the first subset of the plurality of electrodes using a transmitter voltage;
driving the second subset of the plurality of electrodes using a pre-defined voltage that is different from the transmitter voltage; and
obtaining the first resulting signals based on driving the first subset of the plurality of electrodes using the transmitter voltage and driving the second subset of the plurality of electrodes using the pre-defined voltage.
14 . The input device of claim 13 , wherein obtaining the second resulting signals comprises:
driving the first subset of the plurality of electrodes and the second subset of the plurality of electrodes using a same voltage; and
obtaining the second resulting signals based on driving the first subset of the plurality of electrodes and the second subset of the plurality of electrodes using the same voltage.
15 . The input device of claim 9 , wherein obtaining the first resulting signals comprises obtaining the first resulting signals from the second subset of the plurality of electrodes in a first capacitive frame, and wherein obtaining the second resulting signals comprises obtaining the second resulting signals from the second subset of the plurality of electrodes in a second capacitive frame that is subsequent to the first capacitive frame.
16 . The input device of claim 9 , wherein performing the object detection comprises:
obtaining a second reconstructed temperature stable profile based on a second mutual capacitance sensing profile, a second ABS profile, and the reconstructed temperature stable parameter; and
detecting a location of an input object based on the reconstructed temperature stable profile and the second reconstructed temperature stable profile.
17 . A non-transitory computer-readable medium having processor-executable instructions stored thereon for performing a reconstructed temperature stable profile sensing scheme, wherein the processor-executable instructions, when executed, facilitate:
based on driving a first subset of a plurality of electrodes, obtaining first resulting signals from a second subset of the plurality of electrodes;
based on driving both the first subset and the second subset of the plurality of electrodes, obtaining second resulting signals from the second subset of the plurality of electrodes;
obtaining a first temperature coefficient associated with an absolute capacitance sensing (ABS) profile and a second temperature coefficient associated with a mutual capacitance sensing profile;
calculating a reconstructed temperature stable parameter based on the first temperature coefficient and the second temperature coefficient;
determining a reconstructed temperature stable profile based on the mutual capacitance sensing profile associated with the first resulting signals, the ABS profile associated with the second resulting signals, and the reconstructed temperature stable parameter; and
performing object detection based on the reconstructed temperature stable profile.
18 . The non-transitory computer-readable medium of claim 17 ,
wherein the reconstructed temperature stable parameter indicates a ratio associated with the mutual capacitance sensing profile and the ABS profile.
19 . The non-transitory computer-readable medium of claim 17 , wherein determining the reconstructed temperature stable profile is based on the below:
C p =C b −αC t
where C p is the reconstructed temperature stable profile, C b is the ABS profile, C t is the mutual capacitance sensing profile, and α is the reconstructed temperature stable parameter.
20 . The non-transitory computer-readable medium of claim 19 , wherein the reconstructed temperature stable parameter α is based on the below:
α
=
k
b
C
b
k
t
C
t
where k b is the first temperature coefficient that is associated with the ABS profile and k t is the second temperature coefficient that is associated with the mutual capacitance sensing profile.