公开(公告)号：US20200285829A1

公开(公告)日：2020-09-10

申请号：US16809575

申请日：2020-03-05

Applicant: NOVATEK Microelectronics Corp.

Inventor： Tsen-Wei Chang

IPC: G06K9/00 ,  H01L27/32

Abstract: A fingerprint signal processing circuit for a fingerprint sensor configured to sense light from a display panel touchable by a finger includes an analog front-end (AFE) circuit and an analog-to-digital converter (ADC). The AFE circuit is configured to receive an image signal from at least one sensing pixel of the fingerprint sensor and generate an analog output signal. The AFE circuit includes a gain circuit, which is configured to receive a compensation signal and process the image signal according to the compensation signal to generate the analog output signal, wherein a signal value of the compensation signal corresponds to a touched position of the finger in the fingerprint sensor. The ADC, coupled to the AFE circuit, is configured to convert the analog output signal into a digital code.

公开(公告)号：US09841849B2

公开(公告)日：2017-12-12

申请号：US14141452

申请日：2013-12-27

Applicant: Novatek Microelectronics Corp.

Inventor： Hung-Cheng Kuo ,  Tsen-Wei Chang

IPC: G06F3/044 ,  G09G5/18 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0416 ,  G09G5/18

Abstract: A carrier signal detection apparatus, a touch control apparatus and detection methods thereof are provided. The carrier signal detection apparatus includes an analog to digital converting (ADC) apparatus and a filter. The ADC apparatus receives an analog input signal and converts the analog input signal to a digital signal. The filter receives the digital signal and accumulates the digital signal according to a delay time for generating a carrier signal detection result.

公开(公告)号：US12079414B2

公开(公告)日：2024-09-03

申请号：US17474081

申请日：2021-09-14

Applicant: NOVATEK Microelectronics Corp.

Inventor： Tsen-Wei Chang ,  Wing-Kai Tang ,  Shih-Chi Lin

IPC: G06F3/041

CPC classification number: G06F3/0416 ,  G06F3/0412

Abstract: A method for driving a touch panel includes applying a touch driving signal to the touch panel for touch sensing, wherein an amplitude of the touch driving signal rises and falls gradually.

公开(公告)号：US11656716B2

公开(公告)日：2023-05-23

申请号：US17690016

申请日：2022-03-09

Applicant: NOVATEK Microelectronics Corp.

Inventor： Tsen-Wei Chang ,  Chih-Peng Hsia ,  Wei-Lun Shih ,  Hong-Chu Chen ,  Su-Wei Lien ,  Sheng-Wen Hsiao ,  Liang-Chi Cheng

IPC: G06F3/041 ,  G06F3/042 ,  G06V40/13 ,  G06F3/044

CPC classification number: G06F3/04164 ,  G06F3/0412 ,  G06F3/0421 ,  G06F3/0446 ,  G06V40/1318

Abstract: A control method for an optical fingerprint sensor and a touch controller is provided, for canceling or reducing capacitive loading. The optical fingerprint sensor includes a plurality of pixels, and each of the pixels has a first control signal line and a second control signal line. Each of the pixels is further coupled to a first voltage source line, a second voltage source line and a sensing line. The control method includes the step of configuring at least one of the first control signal line, the second control signal line, the first voltage source line, the second voltage source line and the sensing line to be floating when the touch controller is in a touch operation period.

公开(公告)号：US20220197466A1

公开(公告)日：2022-06-23

申请号：US17690016

申请日：2022-03-09

Applicant: NOVATEK Microelectronics Corp.

Inventor： Tsen-Wei Chang ,  Chih-Peng Hsia ,  Wei-Lun Shih ,  Hong-Chu Chen ,  Su-Wei Lien ,  Sheng-Wen Hsiao ,  Liang-Chi Cheng

IPC: G06F3/041 ,  G06F3/042 ,  G06F3/044 ,  G06V40/13

Abstract: A control method for an optical fingerprint sensor and a touch controller is provided, for canceling or reducing capacitive loading. The optical fingerprint sensor includes a plurality of pixels, and each of the pixels has a first control signal line and a second control signal line. Each of the pixels is further coupled to a first voltage source line, a second voltage source line and a sensing line. The control method includes the step of configuring at least one of the first control signal line, the second control signal line, the first voltage source line, the second voltage source line and the sensing line to be floating when the touch controller is in a touch operation period.

公开(公告)号：US20200327301A1

公开(公告)日：2020-10-15

申请号：US16845001

申请日：2020-04-09

Applicant: Novatek Microelectronics Corp.

Inventor： Wei-Lun Shih ,  Tsen-Wei Chang ,  Cho-Hsuan Jhang ,  Chih-Peng Hsia ,  Cheng-Yu Chiang

IPC: G06K9/00

Abstract: A driving apparatus and an operation method thereof are provided. The driving apparatus includes a first driving circuit and a second driving circuit. The first driving circuit performs a first driving mode on a panel. The first driving circuit performs the first driving mode during a first frame period among a plurality of frame periods and skips the first driving mode during a first skip period between the first frame period and a second frame period among the frame periods. The first driving circuit outputs timing control signal including a timing that the first driving mode is skipped. The second driving circuit is coupled to the first driving circuit to receive the timing control signal. The second driving circuit performs a fingerprint sensing operation different from the first driving mode on the panel according to the timing control signal during the first skip period.

公开(公告)号：US10120487B2

公开(公告)日：2018-11-06

申请号：US15194676

申请日：2016-06-28

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Chih-Jen Cheng ,  He-Wei Huang ,  Tsen-Wei Chang

IPC: G06F3/044 ,  G06F3/041

Abstract: A method for hybrid touch sensing for detecting a normal touch and a force touch concurrently is provided. The method includes the following steps. Provide a first driving signal to a first capacitor, wherein the first driving signal is a periodic signal with a first frequency. Provide a second driving signal to a second capacitor, wherein the second driving signal is a periodic signal with a second frequency different from the first frequency. Generate a composite sensing signal by feeding the first driving signal and the second driving signal to a front-end circuit. Extract information from the composite sensing signal to calculate a first change in capacitance of the first capacitor and a second change in capacitance of the second capacitor to detect the normal touch and the force touch concurrently.

公开(公告)号：US11682230B2

公开(公告)日：2023-06-20

申请号：US16809575

申请日：2020-03-05

Applicant: NOVATEK Microelectronics Corp.

Inventor： Tsen-Wei Chang

IPC: G06V40/12 ,  G06V40/13 ,  H10K59/65

CPC classification number: G06V40/1347 ,  G06V40/1318 ,  H10K59/65

Abstract: A fingerprint signal processing circuit for a fingerprint sensor configured to sense light from a display panel touchable by a finger includes an analog front-end (AFE) circuit and an analog-to-digital converter (ADC). The AFE circuit is configured to receive an image signal from at least one sensing pixel of the fingerprint sensor and generate an analog output signal. The AFE circuit includes a gain circuit, which is configured to receive a compensation signal and process the image signal according to the compensation signal to generate the analog output signal, wherein a signal value of the compensation signal corresponds to a touched position of the finger in the fingerprint sensor. The ADC, coupled to the AFE circuit, is configured to convert the analog output signal into a digital code.

公开(公告)号：US11423685B2

公开(公告)日：2022-08-23

申请号：US16845001

申请日：2020-04-09

Applicant: Novatek Microelectronics Corp.

Inventor： Wei-Lun Shih ,  Tsen-Wei Chang ,  Cho-Hsuan Jhang ,  Chih-Peng Hsia ,  Cheng-Yu Chiang

IPC: G06V40/13

Abstract: A driving apparatus and an operation method thereof are provided. The driving apparatus includes a first driving circuit and a second driving circuit. The first driving circuit performs a first driving mode on a panel. The first driving circuit performs the first driving mode during a first frame period among a plurality of frame periods and skips the first driving mode during a first skip period between the first frame period and a second frame period among the frame periods. The first driving circuit outputs timing control signal including a timing that the first driving mode is skipped. The second driving circuit is coupled to the first driving circuit to receive the timing control signal. The second driving circuit performs a fingerprint sensing operation different from the first driving mode on the panel according to the timing control signal during the first skip period.

公开(公告)号：US20170371475A1

公开(公告)日：2017-12-28

申请号：US15194676

申请日：2016-06-28

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Chih-Jen Cheng ,  He-Wei Huang ,  Tsen-Wei Chang

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0416 ,  G06F3/0414 ,  G06F3/044 ,  G06F2203/04105 ,  G06F2203/04106

Abstract: A method for hybrid touch sensing for detecting a normal touch and a force touch concurrently is provided. The method includes the following steps. Provide a first driving signal to a first capacitor, wherein the first driving signal is a periodic signal with a first frequency. Provide a second driving signal to a second capacitor, wherein the second driving signal is a periodic signal with a second frequency different from the first frequency. Generate a composite sensing signal by feeding the first driving signal and the second driving signal to a front-end circuit. Extract information from the composite sensing signal to calculate a first change in capacitance of the first capacitor and a second change in capacitance of the second capacitor to detect the normal touch and the force touch concurrently.