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：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.

公开(公告)号：US10224886B2

公开(公告)日：2019-03-05

申请号：US15716789

申请日：2017-09-27

Applicant: NOVATEK MICROELECTRONICS CORP.

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

IPC: H03F3/45 ,  G05F1/56 ,  H03F1/32 ,  H03F3/30

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 a first current source, a first transistor, a second transistor, a third transistor, and a fourth transistor. The control terminal of the first transistor receives a first input signal. The control terminal of the second transistor receives a second input signal. The third transistor has a first terminal coupled to the second terminal of the first transistor, a second terminal coupled to the first current source, and a control terminal coupled to the control terminal of the second transistor. The fourth transistor has a first terminal coupled to the second terminal of the second transistor, a second terminal coupled to the first current source, and a control terminal coupled to the control terminal of the first transistor.