公开(公告)号：US20220130298A1

公开(公告)日：2022-04-28

申请号：US17185237

申请日：2021-02-25

Applicant: Samsung Display Co., Ltd.

Inventor： Ranick Ng ,  Younghoon Song ,  Amir Amirkhany

IPC: G09G3/00 ,  G01R19/165

Abstract: A replica pixel for testing a display IC that includes a driving circuit that drives a display panel and a sensing circuit that senses a received current is presented. The replica pixel includes a replica pixel transistor, which has a first terminal switchably coupled to a power source, a gate coupled to a first node of a capacitor, and a second terminal coupled to a second node of the capacitor. The first node of the capacitor is switchably coupled to a reference voltage Vref. The second node of the capacitor is switchably coupled to a coupling node, wherein the coupling node selectively couples to either the driving circuit or the sensing circuit. The replica pixel is approximately a real pixel without the display element, and may be used to test the display IC without assembling the display IC with a display panel.

公开(公告)号：US11257416B2

公开(公告)日：2022-02-22

申请号：US16848706

申请日：2020-04-14

Applicant: Samsung Display Co., Ltd.

Inventor： Anup P. Jose ,  Younghoon Song

IPC: G09G3/20

Abstract: A circuit. In some embodiments, the circuit includes: a drive circuit having an output and including: a pre-emphasis circuit; and an output stage connected to an output of the pre-emphasis circuit. The pre-emphasis circuit may be configured to generate, during a first interval of time, a pre-emphasized signal. The output stage may be configured to produce, at the output of the drive circuit, a constant signal based on the pre-emphasized signal during the first interval of time, and to disconnect the pre-emphasis circuit from the output of the drive circuit during a second interval of time, the second interval of time beginning at the end of the first interval of time.

公开(公告)号：US11250780B2

公开(公告)日：2022-02-15

申请号：US16657680

申请日：2019-10-18

Applicant: Samsung Display Co., Ltd.

Inventor： Amir Amirkhany ,  Anup P. Jose ,  Gaurav Malhotra ,  Younghoon Song ,  Mohamed Elzeftawi

IPC: G09G3/3258 ,  G09G3/20

Abstract: A system and method for estimating and using pixel compensation coefficients. In some embodiments, the method includes, during a first time interval: comparing a first pixel current for a pixel of the display with a first reference current, to obtain a first pixel current error signal, the first pixel current error signal being the sign of a difference between the first pixel current and the first reference current; and updating one or more compensation coefficients for the pixel, based on the first pixel current error signal.

公开(公告)号：US20210256897A1

公开(公告)日：2021-08-19

申请号：US16848706

申请日：2020-04-14

Applicant: Samsung Display Co., Ltd.

Inventor： Anup P. Jose ,  Younghoon Song

IPC: G09G3/20

Abstract: A circuit. In some embodiments, the circuit includes: a drive circuit having an output and including: a pre-emphasis circuit; and an output stage connected to an output of the pre-emphasis circuit. The pre-emphasis circuit may be configured to generate, during a first interval of time, a pre-emphasized signal. The output stage may be configured to produce, at the output of the drive circuit, a constant signal based on the pre-emphasized signal during the first interval of time, and to disconnect the pre-emphasis circuit from the output of the drive circuit during a second interval of time, the second interval of time beginning at the end of the first interval of time.

公开(公告)号：US11069282B2

公开(公告)日：2021-07-20

申请号：US16656423

申请日：2019-10-17

Applicant: Samsung Display Co., Ltd.

Inventor： Amir Amirkhany ,  Anup P. Jose ,  Gaurav Malhotra ,  Younghoon Song ,  Mohamed Elzeftawi

IPC: G09G3/32 ,  G01R17/02 ,  H03F3/45

Abstract: A system and method for operating a sensing circuit for sensing a pixel current of a pixel of a display panel using correlated double sampling. In some embodiments, the method includes: during a first interval of time, resetting a pixel sensing circuit; during a third interval of time following the first interval of time, operating the pixel sensing circuit in an integration mode; during a fourth interval of time following the third interval of time, operating the pixel sensing circuit in a hold mode; and during a fifth interval of time following the fourth interval of time, operating the pixel sensing circuit in the integration mode.

公开(公告)号：US20210049951A1

公开(公告)日：2021-02-18

申请号：US16656423

申请日：2019-10-17

Applicant: Samsung Display Co., Ltd.

Inventor： Amir Amirkhany ,  Anup P. Jose ,  Gaurav Malhotra ,  Younghoon Song ,  Mohamed Elzeftawi

IPC: G09G3/32 ,  G01R17/02

Abstract: A system and method for operating a sensing circuit for sensing a pixel current of a pixel of a display panel using correlated double sampling. In some embodiments, the method includes: during a first interval of time, resetting a pixel sensing circuit; during a third interval of time following the first interval of time, operating the pixel sensing circuit in an integration mode; during a fourth interval of time following the third interval of time, operating the pixel sensing circuit in a hold mode; and during a fifth interval of time following the fourth interval of time, operating the pixel sensing circuit in the integration mode.