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1.
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.
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2.
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.
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