公开(公告)号：US20250036233A1

公开(公告)日：2025-01-30

申请号：US18357275

申请日：2023-07-24

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： YEN-CHENG CHENG

IPC: G06F3/041

Abstract: A touch and display driving circuit applicable to driving at least one sensing pad of a touch and display panel and its operation method thereof are provided. The touch and display driving circuit includes a source driver circuit and a touch circuit having an analog front-end circuit, being electrically coupled to the sensing pad of the touch and display panel. The source driver circuit is operable and connected with a first operational voltage and a second operational voltage. The analog front-end circuit is operable and connected with a third operational voltage and a fourth operational voltage. The first operational voltage and the second operational voltage of the source driver circuit are different from the third operational voltage and the fourth operational voltage of the analog front-end circuit. By employing the disclosed technical contents, the invention is effective in reducing power consumption and redundant power waste.

公开(公告)号：US20210365058A1

公开(公告)日：2021-11-25

申请号：US17183310

申请日：2021-02-23

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： YEN-CHENG CHENG

IPC: G05F1/46 ,  H03F3/45

Abstract: An analog front end circuit with pulse width modulation current compensation comprises sensing a current condition and determining if the current condition is a positive or negative current condition. An appropriate control signal is determined according to the current condition and sent to turn on a positive current electronic switch if the current condition is a negative current condition or sent to turn on a negative current electronic switch if the current condition is a positive current condition. A positive compensation current flows to offset negative parasitic current when the positive current electronic switch is turned on and a negative compensation current flows to offset positive parasitic current when the negative current electronic switch is turned on. A master control unit utilizes pulse width modulation signals of various widths associated with various current conditions to be sent to turn on the positive electronic switch or the negative electronic switch.

公开(公告)号：US20230419919A1

公开(公告)日：2023-12-28

申请号：US17809504

申请日：2022-06-28

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： YEN-CHENG CHENG

IPC: G09G3/36

CPC classification number: G09G3/3688 ,  G09G3/3614 ,  G09G2310/0289 ,  G09G2310/0291 ,  G09G2310/027 ,  G06F3/0412

Abstract: A method for driving a liquid crystal display reducing IC area cost of a source driver IC layout is provided, in which a plurality of common voltage electrodes are configured in the display panel. The method includes the following steps of applying a first voltage to at least one of the common voltage electrodes in a first frame period and applying a second voltage to the at least one of the common voltage electrodes in a second frame period. The first and second voltage are different. The method is applicable to a source driver structure of the display panel, and by employing the method, a voltage level of a source driving signal of the source driver is controlled to be positive and only positive-voltage domain circuit is required in the layout configuration. As a result, the invention is effective in reducing IC area cost and avoiding redundant area waste.