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公开(公告)号：US10909348B2
公开(公告)日：2021-02-02
申请号：US16396756
申请日：2019-04-28
Applicant: Novatek Microelectronics Corp.
Inventor： Li-Wei Lin , Ding-Teng Shih , Fan-Wei Kuo
Abstract: An optical fingerprint sensing device and an operation method thereof are provided. The optical fingerprint sensing device includes an optical fingerprint sensing circuit, an image superimposing circuit and a fingerprint matching circuit. The optical fingerprint sensing circuit is configured to capture an original image of the fingerprint. The image superimposing circuit is coupled to the optical fingerprint sensing circuit. The image superimposing circuit is configured to collect the original image of the fingerprint to obtain a plurality of original fingerprint images. The image superimposing circuit superimposes the original fingerprint images according to at least one superimposition parameter to obtain a superimposed fingerprint image. The fingerprint matching circuit is coupled to the image superimposing circuit to receive the superimposed fingerprint image. The fingerprint matching circuit performs fingerprint matching on the superimposed fingerprint image.
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公开(公告)号：US12261610B2
公开(公告)日：2025-03-25
申请号：US18496908
申请日：2023-10-29
Applicant: NOVATEK Microelectronics Corp.
Inventor： Chin-Tung Chan , Yan-Ting Wang , Ren-Hong Luo , Chih-Wen Chen , Hao-Che Hsu , Li-Wei Lin
Abstract: A frequency locked loop circuit, comprising an operational circuit, a first impedance circuit, a second impedance circuit, a switching circuit and a frequency generation circuit. The operational circuit is configured to output an operational signal according to a voltage difference between a positive terminal and a negative terminal. The switching circuit is configured to periodically conduct the negative terminal to one of the first impedance node and the second impedance node, and periodically conduct the positive terminal to the other one of the first impedance node and the second impedance node. The frequency generation circuit is configured to periodically sample the operational signal to generate a sample signal to generate a clock signal. An operational frequency of the operational signal is an integer multiple of a sampling frequency of the frequency generation circuit.
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公开(公告)号：US20200342203A1
公开(公告)日：2020-10-29
申请号：US16396756
申请日：2019-04-28
Applicant: Novatek Microelectronics Corp.
Inventor： Li-Wei Lin , Ding-Teng Shih , Fan-Wei Kuo
Abstract: An optical fingerprint sensing device and an operation method thereof are provided. The optical fingerprint sensing device includes an optical fingerprint sensing circuit, an image superimposing circuit and a fingerprint matching circuit. The optical fingerprint sensing circuit is configured to capture an original image of the fingerprint. The image superimposing circuit is coupled to the optical fingerprint sensing circuit. The image superimposing circuit is configured to collect the original image of the fingerprint to obtain a plurality of original fingerprint images. The image superimposing circuit superimposes the original fingerprint images according to at least one superimposition parameter to obtain a superimposed fingerprint image. The fingerprint matching circuit is coupled to the image superimposing circuit to receive the superimposed fingerprint image. The fingerprint matching circuit performs fingerprint matching on the superimposed fingerprint image.
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