公开(公告)号：US10964273B2

公开(公告)日：2021-03-30

申请号：US16593182

申请日：2019-10-04

Applicant: LG Display Co., Ltd.

Inventor： Hyemi Oh ,  Minkyu Song ,  Jisu Choi ,  Byungjae Lee ,  Myunggi Lim ,  Kyoungdon Woo ,  Seungtae Kim ,  Bumsik Kim

IPC: G09G3/3291

Abstract: A pixel sensing device, an organic light emitting display device and a pixel compensation method thereof are disclosed. The pixel sensing device comprises a plurality of current integrators for sensing driving characteristics of pixels. Each current integrator comprises: an operational amplifier equipped with an inverting input terminal to which a first input voltage is applied according to a pixel current of the pixels, a non-inverting input terminal to which a second input voltage is applied according to the pixel current, and an output terminal through which an integral voltage corresponding to the pixel current is output; and a feedback capacitor connected between the inverting input terminal and the output terminal. The operational amplifier comprises: a pre-amplifying unit for lowering an amplifier input gain and being equipped with the inverting and non-inverting input terminals; and two gain amplifying units for receiving an output of the pre-amplifying unit and for making an amplifier output gain higher than the amplifier input gain.

公开(公告)号：US11361717B2

公开(公告)日：2022-06-14

申请号：US16709005

申请日：2019-12-10

Applicant: LG Display Co., Ltd.

Inventor： Taeyoung Lee ,  KyoungDon Woo ,  KyungRok Kim ,  MyungGi Lim ,  Jisu Choi

IPC: G09G3/3291 ,  G09G3/20

Abstract: A sensing circuit includes: a current source that outputs a direct current; an integrator that integrates a sensing current and the direct current, which is higher than the sensing current, to output an integrated value composed of the sum of a sensing voltage and a direct current voltage; and a subtractor that takes the sensing voltage from the integrated value outputted from the integrator, but not the direct current voltage.