公开(公告)号：US11651746B2

公开(公告)日：2023-05-16

申请号：US17855606

申请日：2022-06-30

Applicant: Novatek Microelectronics Corp.

Inventor： Jhih-Siou Cheng ,  Hung-Ho Huang ,  Kang-Fan Yeh ,  Po-Hsiang Fang

IPC: G09G3/34 ,  G09G3/36

CPC classification number: G09G3/3426 ,  G09G3/36 ,  G09G2310/0297 ,  G09G2320/0646 ,  G09G2360/16

Abstract: A backlight driving device and an operating method thereof are provided to drive multiple backlight zones of a backlight panel. The backlight driving device includes an interface circuit and a driving circuit. The interface circuit receives main backlight data corresponding to a first backlight zone from a former stage device. The driving circuit drives the first backlight zone according to a main current level in a display refresh period of a backlight frame period, does not drive the first backlight zone in a demotion blur period which is prior to the display refresh period, and drives the first backlight zone according to a compensation current level in a vertical blanking period which succeeds the display refresh period. The driving circuit determines the main current level according to the main backlight data, and the compensation current level is lower than the main current level.

公开(公告)号：US11282438B2

公开(公告)日：2022-03-22

申请号：US16919069

申请日：2020-07-01

Applicant: Novatek Microelectronics Corp.

Inventor： Chun-Wei Kang ,  Jhih-Siou Cheng ,  Chun-Fu Lin ,  Po-Hsiang Fang ,  Ju-Lin Huang

IPC: G09G3/32

Abstract: A driver circuit configured to receive a display data and drive a display panel is provided. The display panel includes a plurality of light-emitting diode devices according to the display data. The driver circuit includes a data driver. The data driver is configured to output driving signals to drive the light-emitting diode devices according to the display data and operate in different operation modes according to a control signal. The data driver includes a plurality of output channels. The output channels output the driving signals to drive the light-emitting diode devices via respective output terminals of the driver circuit. An assignment relationship of the display data and the output channels is different in the different operation modes. A display apparatus including the driver circuit is also provided.

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：US10804865B1

公开(公告)日：2020-10-13

申请号：US16729495

申请日：2019-12-30

Applicant: NOVATEK Microelectronics Corp.

Inventor： Chieh-An Lin ,  Yen-Ru Kuo ,  Jhih-Siou Cheng ,  Ju-Lin Huang

IPC: H03M1/12 ,  H03F3/45

Abstract: A current integrator includes an operational amplifier, an integration capacitor and an offset cancelation capacitor. The operational amplifier includes a first input stage and a second input stage. The first input stage is coupled to an input terminal of the current integrator. The integration capacitor is coupled between the first input stage of the operational amplifier and an output terminal of the current integrator. The offset cancelation capacitor is coupled to the second input stage of the operational amplifier.

公开(公告)号：US10789895B2

公开(公告)日：2020-09-29

申请号：US16009290

申请日：2018-06-15

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Chih-Hsien Chou ,  Po-Yu Tseng ,  Jhih-Siou Cheng

IPC: G09G3/36 ,  G09G3/3283 ,  H03F3/45

Abstract: The differential difference amplifier circuit includes a differential input stage circuit, a loading stage circuit coupled to the differential input stage circuit, and an output stage circuit coupled to the loading stage circuit. The output stage circuit is configured to generate an output signal. The differential input stage circuit includes a first differential pair having a first transconductance and a second differential pair having a second transconductance. The first differential pair is biased by a first current source and receives a first input signal and the output signal. The second differential pair is biased by a second current source and receives a second input signal and the output signal. At least one of the first transconductance and the second transconductance is adjusted according to the image data.

公开(公告)号：US10673391B2

公开(公告)日：2020-06-02

申请号：US16402349

申请日：2019-05-03

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Chih-Wen Lu ,  Chih-Hsien Chou ,  Po-Yu Tseng ,  Jhih-Siou Cheng

IPC: H03F3/45 ,  H03F1/32 ,  H03F1/52 ,  H03K17/06 ,  H03F1/08 ,  H03F1/30 ,  H03K17/082

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 an input circuit, a voltage maintaining circuit, and a current source. The input circuit includes a first input transistor and a second input transistor, for receiving a first and a second input signals, respectively. The voltage maintaining circuit includes a first branch circuit and a second branch circuit. The first branch circuit is coupled to the first input transistor for receiving the first input signal, and the second branch circuit is coupled to the second input transistor for receiving the second input signal. The current source is coupled to the first input transistor and the second input transistor. The loading stage circuit is coupled to the voltage maintaining circuit.

公开(公告)号：US20200020282A1

公开(公告)日：2020-01-16

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: 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.

公开(公告)号：US10326411B2

公开(公告)日：2019-06-18

申请号：US15802617

申请日：2017-11-03

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Chih-Wen Lu ,  Chih-Hsien Chou ,  Po-Yu Tseng ,  Jhih-Siou Cheng

IPC: H03F3/45 ,  H03F1/32 ,  H03F1/52 ,  H03K17/06 ,  H03F1/08 ,  H03F1/30 ,  H03K17/082

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 an input circuit, a voltage maintaining circuit, and a current source. The input circuit includes a first input transistor and a second input transistor, for receiving a first and a second input signals, respectively. The voltage maintaining circuit includes a first branch circuit and a second branch circuit. The first branch circuit is coupled to the first input transistor for receiving the first input signal, and the second branch circuit is coupled to the second input transistor for receiving the second input signal. The current source is coupled to the first input transistor and the second input transistor. The loading stage circuit is coupled to the voltage maintaining circuit.

公开(公告)号：US10283069B2

公开(公告)日：2019-05-07

申请号：US15954609

申请日：2018-04-17

Applicant: Novatek Microelectronics Corp.

Inventor： Ju-Lin Huang ,  Jhih-Siou Cheng

IPC: G09G3/36 ,  G02F1/1362

Abstract: A display panel including a plurality of pixel units, a plurality of source lines, a plurality of gate lines and a plurality of common electrode lines is provided. The pixels units are arranged in array. The array includes a plurality of columns and a plurality of rows. The source lines are respectively coupled with the pixel units disposed in a same column of the columns. The gate lines are respectively coupled with the pixel units disposed in a same row of the rows. The common electrode lines and gate lines extend parallelly with each other. At least one of the source date lines, the gate lines and the common electrode lines has the line widths varied along the extension direction thereof.

公开(公告)号：US10163416B2

公开(公告)日：2018-12-25

申请号：US14801855

申请日：2015-07-17

Applicant: Novatek Microelectronics Corp.

Inventor： Chieh-An Lin ,  Jhih-Siou Cheng ,  Po-Hsiang Fang ,  Po-Yu Tseng ,  Ju-Lin Huang ,  Yi-Chuan Liu

IPC: G09G3/36

Abstract: A display apparatus and a driving method of the same are provided. The display apparatus includes a display panel, a gate driver circuit, and a source driver circuit. During a functional sub-period of a frame period, the gate driver circuit simultaneously drives a plurality of gate lines, and the source driver circuit drives a plurality of source lines, so as to perform a function on a plurality of pixels connected to the gate lines. In a scan sub-period of the frame period, the gate driver circuit drives the gate lines according to a scan sequence, and the source driver circuit correspondingly drives the source lines according to the scan sequence of the gate driver circuit in the first scan sub-period, so as to display an image.