公开(公告)号：US11004373B2

公开(公告)日：2021-05-11

申请号：US16429051

申请日：2019-06-02

Applicant: Novatek Microelectronics Corp.

Inventor： Po-Hsiang Fang ,  Jhih-Siou Cheng ,  Ju-Lin Huang

IPC: G09G3/20

Abstract: A source driver and an operating method thereof are provided. The source driver includes a high voltage circuit, a low voltage circuit and a sensing circuit. The low voltage circuit is coupled to the high voltage circuit. The high voltage circuit and low voltage circuit drive a display panel. The sensing circuit is coupled to the low voltage circuit. The sensing circuit senses the display panel during an analog-to-digital operating period. At least one of the high voltage circuit and the low voltage circuit is disabled during at least part of the analog-to-digital operating period.

公开(公告)号：US10971080B2

公开(公告)日：2021-04-06

申请号：US16815129

申请日：2020-03-11

Applicant: NOVATEK MICROELECTRONICS CORP.

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

IPC: G09G3/20 ,  G09G3/3283 ,  H03F3/45 ,  G09G3/36

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：US10832627B2

公开(公告)日：2020-11-10

申请号：US15209778

申请日：2016-07-14

Applicant: Novatek Microelectronics Corp.

Inventor： Jhih-Siou Cheng ,  Yi-Chuan Liu

IPC: G09G3/36 ,  G09G3/20

Abstract: A display apparatus, a source driver of the display apparatus and an operating method of the source driver are provided. The display apparatus includes a display panel, at least one gate driver and a plurality of source drivers. The display panel includes a plurality of source lines and a plurality of gate lines. A plurality of output terminals of the gate driver are coupled to the gate lines in one-to-one manner. A plurality of output terminals of the source drivers are coupled to the source lines in one-to-one manner to provide a plurality of source driving voltages to the source lines. The source driving voltages include different coarse compensation voltages. The coarse compensation voltages are respectively configured based on distances between the source drivers which control the source lines and input terminals of the gate lines of the display panel.

公开(公告)号：US10777146B2

公开(公告)日：2020-09-15

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.

公开(公告)号：US10762846B2

公开(公告)日：2020-09-01

申请号：US16120468

申请日：2018-09-04

Applicant: Novatek Microelectronics Corp.

Inventor： Jhih-Siou Cheng ,  Tzong-Honge Shieh ,  Chieh-An Lin ,  Ju-Lin Huang

IPC: G09G3/3258 ,  G06F3/041 ,  G06F3/044 ,  G09G3/3275 ,  G09G3/3208

Abstract: A driver of a display panel is provided. The driver includes a plurality of sensing channels and a signal convertor. The plurality of sensing channels are configured to receive a plurality of sensing signals from the display panel via a plurality of sensing lines and output the sensing signals. The signal convertor is coupled to the sensing channels and configured to receive the sensing signals from the sensing channels. The signal convertor receives the sensing signals from the sensing channels in different sequences during different sensing periods.

公开(公告)号：US20200220350A1

公开(公告)日：2020-07-09

申请号：US16821947

申请日：2020-03-17

Applicant: NOVATEK Microelectronics Corp.

Inventor： Jhih-Siou Cheng ,  Ju-Lin Huang ,  Chia-En Wu

IPC: H02H9/04 ,  H01L27/02

Abstract: The present invention provides an output circuit with electrostatic discharge (ESD) protection in a semiconductor chip of a source driver. The source driver is configured to drive a display panel. The output circuit includes an output buffer, an output pad, a switch and a first resistor. The switch is coupled between the output buffer and the output pad, wherein data voltages for driving the display panel are transmitted from the output buffer to the output pad via the switch. The switch includes a first metal oxide semiconductor (MOS) transistor, which includes a first terminal coupled to the output pad, a bulk terminal and a gate terminal. The first resistor is coupled between the bulk terminal of the first MOS transistor and a first power supply terminal.

公开(公告)号：US10673397B2

公开(公告)日：2020-06-02

申请号：US15688899

申请日：2017-08-29

Applicant: NOVATEK Microelectronics Corp.

Inventor： Jhih-Siou Cheng ,  Tzong-Honge Shieh

IPC: H03F3/18 ,  H03F3/26 ,  H03F3/21 ,  H03F3/30 ,  G09G3/36 ,  H03F3/72 ,  H03F3/68

Abstract: An operational amplifier includes an output node; an output stage, comprising a plurality of output current paths and a plurality of control nodes, wherein the plurality of control nodes are respectively coupled to the plurality of output current paths, and the plurality of output current paths are coupled to the output node and respectively coupled to a plurality of power supply sources providing different voltages; and a selecting unit, configured to couple an internal output node of the operational amplifier to one of the plurality of control nodes of the output stage.

公开(公告)号：US20200168154A1

公开(公告)日：2020-05-28

申请号：US16198864

申请日：2018-11-22

Applicant: NOVATEK Microelectronics Corp.

Inventor： Jhih-Siou Cheng ,  Po-Yu Tseng ,  Keko-Chun Liang ,  Ju-Lin Huang ,  Chih-Hsien Chou

IPC: G09G3/3258 ,  H01L27/32 ,  H01L27/12

Abstract: A sensing circuit for an organic light-emitting diode (OLED) driver includes a sample and hold circuit and a clamping circuit. The sample and hold circuit includes a capacitor. The clamping circuit, coupled to the sample and hold circuit, is configured to clamp a sensing voltage received by the sample and hold circuit to conform to a withstand voltage of the capacitor.

公开(公告)号：US10417972B1

公开(公告)日：2019-09-17

申请号：US16219866

申请日：2018-12-13

Applicant: Novatek Microelectronics Corp.

Inventor： Jhih-Siou Cheng ,  Ju-Lin Huang

IPC: H03M1/66 ,  G09G3/3291 ,  G09G3/3233 ,  H03M1/74

Abstract: A gamma correction digital-to-analog converter (DAC) includes a first DAC circuit, a second DAC circuit and a voltage generator. The first DAC circuit includes a plurality of first transistors and is configured to receive a plurality of first reference gamma voltages and 1 upper bits of k-bit digital data and generate a first gamma voltage based on the 1 upper bits of the k-bit digital data and the first reference gamma voltages. The second DAC circuit includes a plurality of second transistors and is configured to receive a plurality of second reference gamma voltages and m lower bits of the k-bit digital data and generate a second gamma voltage based on the m lower bits of the k-bit digital data and the second reference gamma voltages. The voltage generator is configured to generate a bulk voltage and supply the generated bulk voltage to a bulk terminal of each of the first transistors or supply the generated bulk voltage to a bulk terminal of each of the second transistors to generate a gamma correction analog signal according to the first gamma voltage and the second gamma voltage. A data driver including a gamma correction DAC and a method thereof are also introduced.

公开(公告)号：US20190260334A1

公开(公告)日：2019-08-22

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

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.