公开(公告)号：US20230061354A1

公开(公告)日：2023-03-02

申请号：US17721465

申请日：2022-04-15

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Kyung Tea PARK ,  Ji Woong KIM ,  Hyung Gun MA ,  Seong An PARK ,  Seong Joo LEE ,  Tae Hun LEE ,  Sang Hyun HEO

IPC: G09G3/32 ,  H03F3/70

Abstract: An analog front-end includes a (1-1)-th charge amplifier configured to differentially amplify a first and second sensing signals provided to a (1-1)-th input terminal and a (1-2)-th input terminal, respectively, and output a (1-1)-th differential signal. A (1-2)-th charge amplifier is configured to differentially amplify the second sensing signal and a third sensing signal provided to a (1-3)-th input terminal and a (1-4)-th input terminal, respectively, and output a (1-2)-th differential signal. A second charge amplifier is configured to differentially amplify the (1-1)-th differential signal and the (1-2)-th differential signal provided to a (2-1)-th input terminal and a (2-2)-th input terminal, respectively, and output a (2-1)-th differential signal and a (2-2)-th differential signal. A demodulation circuit is configured to filter the (2-1)-th differential signal and the (2-2)-th differential signal and output demodulated differential signals. An analog-to-digital converter is configured to output a sensing value based on the demodulated differential signals.