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：US20180337642A1

公开(公告)日：2018-11-22

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

CPC classification number: H03F1/3205 ,  H03F1/086 ,  H03F1/301 ,  H03F1/3211 ,  H03F1/523 ,  H03F3/45183 ,  H03F3/4521 ,  H03F3/45219 ,  H03F3/45237 ,  H03F3/45381 ,  H03F3/45632 ,  H03F2203/45342 ,  H03F2203/45352 ,  H03F2203/45382 ,  H03F2203/45384 ,  H03K17/063 ,  H03K17/0822

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：US11900896B2

公开(公告)日：2024-02-13

申请号：US17881622

申请日：2022-08-05

Applicant: NOVATEK Microelectronics Corp.

Inventor： Jhih-Siou Cheng ,  Yen-Kai Chen ,  Jui-Chan Chang ,  Chih-Hsien Chou

IPC: G09G3/32 ,  G09G3/36

CPC classification number: G09G3/3688 ,  G09G3/32 ,  G09G2310/0248 ,  G09G2310/0291 ,  G09G2310/061 ,  G09G2330/023

Abstract: A source driver includes a plurality of output terminals and a plurality of driving channels. Each of the plurality of driving channels is coupled to an output terminal among the plurality of output terminals and includes an output buffer, an output enable switch and a charge sharing circuit. The output enable switch is coupled between the output buffer and the corresponding output terminal. The charge sharing circuit is coupled to the corresponding output terminal. Wherein, the charge sharing circuits of at least two of the plurality of driving channels are commonly coupled to a charge sharing bus.

公开(公告)号：US20230138843A1

公开(公告)日：2023-05-04

申请号：US17881622

申请日：2022-08-05

Applicant: NOVATEK Microelectronics Corp.

Inventor： Jhih-Siou Cheng ,  Yen-Kai Chen ,  Jui-Chan Chang ,  Chih-Hsien Chou

IPC: G09G3/32

Abstract: A source driver includes a plurality of output terminals and a plurality of driving channels. Each of the plurality of driving channels is coupled to an output terminal among the plurality of output terminals and includes an output buffer, an output enable switch and a charge sharing circuit. The output enable switch is coupled between the output buffer and the corresponding output terminal. The charge sharing circuit is coupled to the corresponding output terminal. Wherein, the charge sharing circuits of at least two of the plurality of driving channels are commonly coupled to a charge sharing bus.

公开(公告)号：US11205382B2

公开(公告)日：2021-12-21

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: G09G3/32 ,  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：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：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.