公开(公告)号：US20230335040A1

公开(公告)日：2023-10-19

申请号：US18083055

申请日：2022-12-16

Applicant: Samsung Electronics Co., Ltd.

Inventor： Chanbong YU ,  Yeongshin Jang ,  Woonyoung Lee

IPC: G09G3/20

CPC classification number: G09G3/2096 ,  G09G2310/0291 ,  G09G2320/0276 ,  G09G2310/08 ,  G09G2330/028

Abstract: A display driver is provided. The display driver includes: a plurality of source amplifiers connected to a plurality of source lines of a display panel, wherein one of the plurality of source amplifiers includes an input stage and an output stage configured to output a grayscale voltage to a source line of the plurality of source lines; and a decoder circuit configured to provide at least one of a plurality of gamma voltages to the input stage based on image data. The output stage includes a plurality of unit circuits connected to each other in parallel between the input stage and an output pad connected to the source line. Each of the plurality of unit circuits includes a buffer switch and an output buffer connected to the input stage, and is connected to the output pad through a resistor.

公开(公告)号：US20220109415A1

公开(公告)日：2022-04-07

申请号：US17232762

申请日：2021-04-16

Applicant: Samsung Electronics Co., Ltd.

Inventor： Youngbae MOON ,  Woonyoung LEE ,  Chanbong YU ,  Yunseok JANG

IPC: H03F3/45 ,  H02H9/04 ,  G09G3/3275

Abstract: An output buffer circuit includes an operational amplifier configured to generate an amplifier output voltage signal based on an input voltage signal and on a compensation current, a slew rate compensating circuit configured to generate the compensation current to increase a slew rate of the amplifier output voltage signal based on a difference between the input voltage signal and a feedback voltage signal, an output path circuit connected between the operational amplifier and an output pad, the output path circuit configured to transfer the amplifier output voltage signal to generate a pad output voltage signal through the output pad, and a feedback path circuit, the feedback path circuit connected between the slew rate compensating circuit and a feedback input node that is on the output path circuit, the feedback path circuit configured to generate the feedback voltage signal.