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公开(公告)号：US11956869B2
公开(公告)日：2024-04-09
申请号：US17964059
申请日：2022-10-12
Applicant: NOVATEK Microelectronics Corp.
Inventor： Chih-Hsien Chou , Jhih-Siou Cheng , Jin-Yi Lin , Ren-Chieh Yang
IPC: H05B45/325 , G09G3/32 , H05B45/345 , H05B45/46 , H05B45/54
CPC classification number: H05B45/325 , G09G3/32 , H05B45/345 , H05B45/46 , H05B45/54
Abstract: A display driver circuit for controlling a display panel having a plurality of light-emission diode (LED) strings includes a plurality of current regulators and a control circuit. Each of the plurality of current regulators is configured to control one of the plurality of LED strings. The control circuit, coupled to the plurality of current regulators, is configured to generate a plurality of pulses in a plurality of pulse width modulation (PWM) signals and output each of the plurality of PWM signals to a respective current regulator among the plurality of current regulators. Wherein, the plurality of pulses are scrambled.
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公开(公告)号：US11856669B1
公开(公告)日：2023-12-26
申请号：US18059433
申请日：2022-11-29
Applicant: NOVATEK Microelectronics Corp.
Inventor： Jhih-Siou Cheng , Chih-Hsien Chou , Ren-Chieh Yang
IPC: H05B45/325 , G09G3/32 , H05B45/345
CPC classification number: H05B45/345 , H05B45/325
Abstract: A driving method, for a controller in a display apparatus, is disclosed. The display apparatus includes LED strings, scan transistors, current regulators and a power converter. The driving method includes following steps. LED cathode voltages are detected on nodes between the LED strings and the current regulators. When a first LED cathode voltage is equal to a minimal operable voltage of the current regulators and a second LED cathode voltage exceeds the minimal operable voltage of the current regulators, a driving current flowing through the second data channel is adjusted by increasing a pulse current level of the driving current and reducing a duty cycle ratio of the driving current flowing through the second data channel.
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公开(公告)号：US11856668B1
公开(公告)日：2023-12-26
申请号：US18059432
申请日：2022-11-29
Applicant: NOVATEK Microelectronics Corp.
Inventor： Jhih-Siou Cheng , Chih-Hsien Chou , Ren-Chieh Yang
IPC: H05B45/345 , H05B45/37
CPC classification number: H05B45/345 , H05B45/37
Abstract: A driving method, for a controller in a display apparatus, is disclosed. The display apparatus includes LED strings, scan transistors, current regulators and a power converter. The driving method includes following steps. LED cathode voltages are detected on nodes between the LED strings and the current regulators. When a first LED cathode voltage corresponding to a first scanning channel is equal to a minimal operable voltage of the current regulators and a second LED cathode voltage corresponding to a second scanning channel exceeds the minimal operable voltage of the current regulators, a voltage drop over one corresponding scan transistor is increased on the second scanning channel.
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公开(公告)号：US11211016B2
公开(公告)日：2021-12-28
申请号：US16512413
申请日：2019-07-16
Applicant: Novatek Microelectronics Corp.
Inventor： Chih-Hsien Chou , Jhih-Siou Cheng , Jin-Yi Lin
IPC: G06F1/00 , G09G3/3291
Abstract: A source driver is configured to drive an organic light-emitting diode (OLED) display panel. The source driver includes a sensing circuit and an operational amplifier. The sensing circuit is configured to sense pixel information of an OLED pixel circuit through a sensing line of the OLED display panel. The operational amplifier includes an amplifier circuit and at least one switch circuit. The amplifier circuit includes at least one gain circuit. An input terminal of the amplifier circuit is coupled to an output terminal of the sensing circuit. Each of the at least one switch circuit is coupled between a pair of output terminals of a corresponding one of the at least one gain circuit.
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公开(公告)号：US20180337646A1
公开(公告)日：2018-11-22
申请号：US15716789
申请日：2017-09-27
Applicant: NOVATEK MICROELECTRONICS CORP.
Inventor： Chih-Wen Lu , Po-Yu Tseng , Jhih-Siou Cheng , Shang-I Liu , Chih-Hsien Chou
Abstract: An operational amplifier circuit is provided. The operational amplifier circuit includes a differential input stage circuit and a loading stage circuit. The differential input stage circuit includes a first current source, a first transistor, a second transistor, a third transistor, and a fourth transistor. The control terminal of the first transistor receives a first input signal. The control terminal of the second transistor receives a second input signal. The third transistor has a first terminal coupled to the second terminal of the first transistor, a second terminal coupled to the first current source, and a control terminal coupled to the control terminal of the second transistor. The fourth transistor has a first terminal coupled to the second terminal of the second transistor, a second terminal coupled to the first current source, and a control terminal coupled to the control terminal of the first transistor.
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Patent Agency Ranking
公开(公告)号：US12081232B2
公开(公告)日：2024-09-03
申请号：US17827822
申请日：2022-05-30
Applicant: Novatek Microelectronics Corp.
Inventor： Jhih-Siou Cheng , Chih-Hsien Chou , Chieh-An Lin
CPC classification number: H03M1/661 , G09G3/2007 , G09G2310/027 , G09G2310/0289
Abstract: The disclosure provides a digital-to-analog conversion device and an operation method thereof. The digital-to-analog conversion device includes a digital-to-analog conversion circuit and a slew rate enhancement circuit. The digital-to-analog conversion circuit is configured to convert a digital code into an analog voltage. An output terminal of the digital-to-analog conversion circuit outputs the analog voltage to a load circuit. A control terminal of the slew rate enhancement circuit is coupled to the digital-to-analog conversion circuit to receive a control voltage following the analog voltage. The slew rate enhancement circuit is coupled to the output terminal of the digital-to-analog conversion circuit. The slew rate enhancement circuit enhances the slew rate at the output terminal of the digital-to-analog conversion circuit based on the control voltage.
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公开(公告)号：US11881136B2
公开(公告)日：2024-01-23
申请号：US17646198
申请日：2021-12-28
Applicant: NOVATEK MICROELECTRONICS CORP.
Inventor： Jhih-Siou Cheng , Yen-Ru Kuo , Chih-Hsien Chou
IPC: G09G3/20
CPC classification number: G09G3/20 , G09G2310/0289 , G09G2310/0291 , G09G2310/08 , G09G2330/021
Abstract: A display driver and a driving method thereof is disclosed. The display driver includes at least one first latch, at least one second latch, an output buffer, and a comparator. The first latch receives input data. The input terminal of the second latch is coupled to the output terminal of the first latch. The output buffer, including at least one variable current source, is coupled to the second latch. The comparator is coupled to the first latch, the second latch, and the variable current source. The comparator generates at least one control signal of the variable current source.
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公开(公告)号：US20200020283A1
公开(公告)日：2020-01-16
申请号：US16512414
申请日：2019-07-16
Applicant: Novatek Microelectronics Corp.
Inventor： Chih-Hsien Chou , Po-Yu Tseng , Jhih-Siou Cheng , Jin-Yi Lin
IPC: G09G3/3291
Abstract: A source driver including a sensing circuit and an operational amplifier is provided. The sensing circuit senses pixel information of an organic light-emitting diode (OLED) pixel circuit. The operational amplifier includes an amplifier circuit and an offset voltage storing and reducing circuit. An input terminal of the amplifier circuit is coupled to the sensing circuit. The amplifier circuit includes a first gain circuit and a second gain circuit. An output terminal of the offset voltage storing and reducing circuit is coupled to a coupling terminal of the first gain circuit. An input terminal of the offset voltage storing and reducing circuit is coupled to an output terminal of the second gain circuit. The offset voltage storing and reducing circuit stores and reduces an offset voltage of the first gain circuit.
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公开(公告)号：US20230387937A1
公开(公告)日：2023-11-30
申请号：US17827822
申请日：2022-05-30
Applicant: Novatek Microelectronics Corp.
Inventor： Jhih-Siou Cheng , Chih-Hsien Chou , Chieh-An Lin
CPC classification number: H03M1/661 , G09G3/2007 , G09G2310/027 , G09G2310/0289
Abstract: The disclosure provides a digital-to-analog conversion device and an operation method thereof. The digital-to-analog conversion device includes a digital-to-analog conversion circuit and a slew rate enhancement circuit. The digital-to-analog conversion circuit is configured to convert a digital code into an analog voltage. An output terminal of the digital-to-analog conversion circuit outputs the analog voltage to a load circuit. A control terminal of the slew rate enhancement circuit is coupled to the digital-to-analog conversion circuit to receive a control voltage following the analog voltage. The slew rate enhancement circuit is coupled to the output terminal of the digital-to-analog conversion circuit. The slew rate enhancement circuit enhances the slew rate at the output terminal of the digital-to-analog conversion circuit based on the control voltage.
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公开(公告)号：US20230269845A1
公开(公告)日：2023-08-24
申请号：US17964059
申请日：2022-10-12
Applicant: NOVATEK Microelectronics Corp.
Inventor： Chih-Hsien Chou , Jhih-Siou Cheng , Jin-Yi Lin , Ren-Chieh Yang
IPC: H05B45/325 , H05B45/46 , H05B45/345 , H05B45/54 , G09G3/32
CPC classification number: H05B45/325 , H05B45/46 , H05B45/345 , H05B45/54 , G09G3/32
Abstract: A display driver circuit for controlling a display panel having a plurality of light-emission diode (LED) strings includes a plurality of current regulators and a control circuit. Each of the plurality of current regulators is configured to control one of the plurality of LED strings. The control circuit, coupled to the plurality of current regulators, is configured to generate a plurality of pulses in a plurality of pulse width modulation (PWM) signals and output each of the plurality of PWM signals to a respective current regulator among the plurality of current regulators. Wherein, the plurality of pulses are scrambled.
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