CAPACITIVE FINGERPRINT SENSING APPARATUS AND CAPACITIVE FINGERPRINT SENSING METHOD
First Claim
1. A capacitive fingerprint sensing apparatus, comprising:
- M sensing lines;
N scanning lines;
a scanning driver coupled to the N scanning lines;
a sensing driver coupled to the M sensing lines;
a plurality of sensing electrodes arranged to form a (N*M) matrix having N rows of sensing electrodes and M columns of sensing electrodes, wherein the M columns of sensing electrodes are arranged along a first direction and coupled to the M sensing lines respectively and the N rows of sensing electrodes are arranged along a second direction and coupled to the N scanning lines respectively, M and N are positive integers; and
a processing module coupled to the plurality of sensing electrodes;
wherein in a self-capacitive sensing mode, the scanning driver scans the N rows of sensing electrodes through the N scanning lines respectively and the sensing driver performs self-capacitive sensing on the M columns of sensing electrodes through the M sensing lines respectively and the processing module obtains a first fingerprint pattern;
in a mutual-capacitive sensing mode, the scanning driver scans N rows of sensing electrodes through N scanning lines respectively and the sensing driver performs mutual-capacitive sensing between odd columns of sensing electrodes and even columns of sensing electrodes of the N rows of sensing electrodes through odd sensing lines and even sensing lines of the M sensing lines respectively and the processing module obtains a second fingerprint pattern;
the processing module combines the first fingerprint pattern and second fingerprint pattern into a synthesized fingerprint pattern, and a resolution of the synthesized fingerprint pattern along at least one direction is larger than a resolution of the first fingerprint pattern and a resolution of the second fingerprint pattern along the at least one direction, wherein the at least one direction comprises at least one of the first direction, the second direction, . . . , and a L-th direction, and L≧
3.
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Accused Products
Abstract
A capacitive fingerprint sensing apparatus includes a scanning driver, a sensing driver, sensing lines, scanning lines, and sensing electrodes arranged in a regular way. In a self-capacitive sensing mode, scanning driver scans sensing electrodes through scanning lines and sensing driver performs self-capacitive sensing on sensing electrodes through sensing lines to obtain a first fingerprint pattern. In a mutual-capacitive sensing mode, scanning driver scans sensing electrodes through scanning lines and sensing driver performs mutual-capacitive sensing on at least one pair adjacent sensing electrodes through sensing lines to obtain a second fingerprint pattern. The first fingerprint pattern and second fingerprint pattern are synthesized to a synthesized fingerprint pattern having resolution larger than first fingerprint pattern and second fingerprint pattern along at least one direction.
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Citations
24 Claims
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1. A capacitive fingerprint sensing apparatus, comprising:
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M sensing lines; N scanning lines; a scanning driver coupled to the N scanning lines; a sensing driver coupled to the M sensing lines; a plurality of sensing electrodes arranged to form a (N*M) matrix having N rows of sensing electrodes and M columns of sensing electrodes, wherein the M columns of sensing electrodes are arranged along a first direction and coupled to the M sensing lines respectively and the N rows of sensing electrodes are arranged along a second direction and coupled to the N scanning lines respectively, M and N are positive integers; and a processing module coupled to the plurality of sensing electrodes; wherein in a self-capacitive sensing mode, the scanning driver scans the N rows of sensing electrodes through the N scanning lines respectively and the sensing driver performs self-capacitive sensing on the M columns of sensing electrodes through the M sensing lines respectively and the processing module obtains a first fingerprint pattern;
in a mutual-capacitive sensing mode, the scanning driver scans N rows of sensing electrodes through N scanning lines respectively and the sensing driver performs mutual-capacitive sensing between odd columns of sensing electrodes and even columns of sensing electrodes of the N rows of sensing electrodes through odd sensing lines and even sensing lines of the M sensing lines respectively and the processing module obtains a second fingerprint pattern;
the processing module combines the first fingerprint pattern and second fingerprint pattern into a synthesized fingerprint pattern, and a resolution of the synthesized fingerprint pattern along at least one direction is larger than a resolution of the first fingerprint pattern and a resolution of the second fingerprint pattern along the at least one direction, wherein the at least one direction comprises at least one of the first direction, the second direction, . . . , and a L-th direction, and L≧
3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A capacitive fingerprint sensing apparatus, comprising:
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(M+1) sensing lines; N pairs of scanning lines, each pair of scanning lines comprising a first scanning line and a second scanning line; a scanning driver coupled to the N pairs of scanning lines; a sensing driver coupled to the (M+1) sensing lines; a plurality of sensing electrodes arranged to form a (N*M) matrix having N rows of sensing electrodes and M columns of sensing electrodes, wherein the M columns of sensing electrodes are arranged along a first direction and coupled to the (M+1) sensing lines respectively in a Zig-Zag way and the N rows of sensing electrodes are arranged along a second direction and coupled to the N pairs of scanning lines respectively, M and N are positive integers; and a processing module coupled to the plurality of sensing electrodes; wherein in a self-capacitive sensing mode, the scanning driver scans the N rows of sensing electrodes through the N pairs of scanning lines respectively and the sensing driver performs self-capacitive sensing on the M columns of sensing electrodes through the (M+1) sensing lines respectively and the processing module obtains a first fingerprint pattern;
in a mutual-capacitive sensing mode, the scanning driver scans odd rows of sensing electrodes or even rows of sensing electrodes of the N rows of sensing electrodes through N first scanning lines and N second scanning lines of the N pairs of scanning lines respectively and the sensing driver performs mutual-capacitive sensing on the M columns of sensing electrodes or the N rows of sensing electrodes through the (M+1) sensing lines respectively and the processing module obtains a second fingerprint pattern;
the processing module combines the first fingerprint pattern and second fingerprint pattern into a synthesized fingerprint pattern. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A capacitive fingerprint sensing method applied to a capacitive fingerprint sensing apparatus, the capacitive fingerprint sensing apparatus comprising a scanning driver, a sensing driver, a plurality of sensing lines, a plurality of scanning lines and a plurality of sensing electrodes, the plurality of sensing electrodes being arranged in a regular way, the capacitive fingerprint sensing method comprising:
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in a self-capacitive sensing mode, the scanning driver scans the plurality of sensing electrodes through the plurality of scanning lines respectively and the sensing driver performs self-capacitive sensing on the plurality of sensing electrodes through the plurality of sensing lines respectively to obtain a first fingerprint pattern; in a mutual-capacitive sensing mode, the scanning driver scans the plurality of sensing electrodes through the plurality of scanning lines respectively and the sensing driver performs mutual-capacitive sensing on at least one pair of adjacent sensing electrodes of the plurality of sensing electrodes through the plurality of sensing lines respectively to obtain a second fingerprint pattern; and combining the first fingerprint pattern and second fingerprint pattern into a synthesized fingerprint pattern, wherein a resolution of the synthesized fingerprint pattern along at least one direction is larger than a resolution of the first fingerprint pattern and a resolution of the second fingerprint pattern along the at least one direction. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification