公开(公告)号：US20250007475A1

公开(公告)日：2025-01-02

申请号：US18624110

申请日：2024-04-01

Applicant: NOVATEK Microelectronics Corp.

Inventor： Jui-Chan Chang ,  Jhih-Siou Cheng ,  Ren-Chieh Yang ,  Jin-Yi Lin

IPC: H03F3/45

Abstract: A calibration circuit of a differential difference amplifier (DDA) includes a trimming circuit, a bias generator and a compensation output circuit. The trimming circuit is used to output a trimming code. The bias generator, coupled to the trimming circuit, is used to generate a bias current or voltage according to the trimming code. The compensation output circuit, coupled to the bias generator, is used to receive a data code of the DDA and output the bias current or voltage corresponding to the data code to the DDA.

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.

公开(公告)号：US11217152B1

公开(公告)日：2022-01-04

申请号：US17111449

申请日：2020-12-03

Applicant: NOVATEK Microelectronics Corp.

Inventor： Yu-Sheng Ma ,  Jhih-Siou Cheng ,  Chun-Fu Lin ,  Tso-Sheng Chan ,  Ren-Chieh Yang

IPC: G09G3/32

Abstract: The present invention provides a source driver for driving a light emitting diode panel. The source driver includes a buffer including an output terminal; and a plurality of driving circuits coupled to the buffer. Each of the plurality of driving circuits includes a constant current transistor including a gate controlled by a node voltage of the output terminal of the buffer; and a compensation unit for compensating the node voltage of the output terminal of the buffer.

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.

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.

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.

公开(公告)号：US20210390901A1

公开(公告)日：2021-12-16

申请号：US17111449

申请日：2020-12-03

Applicant: NOVATEK Microelectronics Corp.

Inventor： Yu-Sheng Ma ,  Jhih-Siou Cheng ,  Chun-Fu Lin ,  Tso-Sheng Chan ,  Ren-Chieh Yang

IPC: G09G3/32

Abstract: The present invention provides a source driver for driving a light emitting diode panel. The source driver includes a buffer including an output terminal; and a plurality of driving circuits coupled to the buffer. Each of the plurality of driving circuits includes a constant current transistor including a gate controlled by a node voltage of the output terminal of the buffer; and a compensation unit for compensating the node voltage of the output terminal of the buffer.