公开(公告)号：US10249244B2

公开(公告)日：2019-04-02

申请号：US15631860

申请日：2017-06-23

Applicant: LG Display Co., Ltd.

Inventor： Seungtae Kim ,  Myunggi Lim ,  Seokhyun Hong

IPC: G09G5/00 ,  G09G3/3258 ,  G09G3/00

Abstract: An organic light-emitting display comprises: a display panel with a plurality of pixels; a plurality of source driver ICs comprising sensing blocks that are connected to the pixels and sense the electrical characteristics of the pixels; and a calibration block that applies test currents to the sensing blocks in order to sense offset variations between the sensing blocks in a preset calibration mode. The calibration block comprises: a plurality of discrete current sources that generate the test currents; and a switch array that connects the source driver ICs and the discrete current sources, wherein two or more neighboring source driver ICs share one discrete current source, and each source driver IC is selectively connected to two or more discrete current sources.

公开(公告)号：US10311788B2

公开(公告)日：2019-06-04

申请号：US15816553

申请日：2017-11-17

Applicant: LG DISPLAY CO., LTD.

Inventor： Myunggi Lim ,  Kyoungdon Woo ,  Jaeyoon Bae

IPC: G09G3/36 ,  G09G3/3233

Abstract: An organic light-emitting display includes a driving transistor that drives an organic light-emitting diode, a first transistor connected between a data line supplying a data voltage and a gate electrode of the driving transistor, a second transistor connected between a reference voltage input line and a source electrode of the driving transistor, and a third transistor that directly charges the gate electrode of the driving transistor with a reference voltage supplied from the reference voltage input line, in response to a black data control signal, wherein the third transistor directly receives the reference voltage by being turned on for a certain period of time after the gate electrode of the driving transistor is programmed with the data voltage in one frame before receiving a data voltage in the next frame.

公开(公告)号：US09852697B2

公开(公告)日：2017-12-26

申请号：US14854301

申请日：2015-09-15

Applicant: LG Display Co., Ltd.

Inventor： Myunggi Lim ,  Kyoungdon Woo

IPC: G09G3/32 ,  G09G3/3275 ,  G09G3/3233

CPC classification number: G09G3/3275 ,  G09G3/3233 ,  G09G2300/0828 ,  G09G2320/0233 ,  G09G2320/0271 ,  G09G2320/029 ,  G09G2320/0295 ,  G09G2320/043 ,  G09G2320/0626 ,  G09G2330/028

Abstract: An organic light emitting diode display includes a display panel including a plurality of pixels, each pixel including an organic light emitting diode (OLED) and a driving thin film transistor (TFT) configured to control an amount of current flowing in the OLED depending on a difference between a data voltage and a reference voltage, a source driver integrated circuit (IC) configured to produce the data voltages corresponding to data of an input image and apply the data voltages to data lines connected to the pixels, an image analyzer configured to analyze the data of the input image and produce reference voltage control data, and a reference voltage regulator configured to produce the reference voltages varying depending on the input image based on the reference voltage control data and apply the reference voltages to reference lines connected to the pixels.

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：US10515589B2

公开(公告)日：2019-12-24

申请号：US15685377

申请日：2017-08-24

Applicant: LG Display Co., Ltd.

Inventor： Hyuckjun Kim ,  Seokhyun Hong ,  Myunggi Lim

IPC: G09G3/3241 ,  G09G3/3291 ,  H01L51/50 ,  H05B33/08 ,  G09G3/3233

Abstract: The present invention provides an OLED display device including a display panel, a data driver and a timing controller. The display panel has sub-pixels for displaying images. The data driver supplies a data signal to data lines of the sub-pixels. The timing controller supplies the data signal to the data driver and controls the data driver. The data driver outputs a stress prevention voltage for preventing application of stress to driving transistors included in the sub-pixels in response to a stress compensation signal output from the timing controller, and the stress prevention voltage is applied to M (M being an integer equal to or greater than 1) sub-pixels selected per frame.

公开(公告)号：US11588993B2

公开(公告)日：2023-02-21

申请号：US16583670

申请日：2019-09-26

Applicant: LG Display Co., Ltd.

Inventor： Taeyoung Lee ,  Myunggi Lim ,  Kyoungdon Woo ,  Bumsik Kim ,  Seungtae Kim ,  Byungjae Lee ,  Minkyu Song

IPC: H04N5/369 ,  G09G3/3291 ,  G09G3/3233 ,  H04N5/374

Abstract: A current sensing device and the organic light-emitting display device including the same are disclosed. The current sensing device may include a plurality of sensing units, each sensing unit playing a role of converting a pixel current input through a sensing line into a digital sensing value, and each sensing unit comprising: a current integrator including an integrating amplifier and a feedback capacitor, the integrating amplifier comprising an inverting input terminal, a non-inverting input terminal and an output terminal, wherein the feedback capacitor is connected between the inverting input terminal and the output terminal, and a first reference voltage is input to the non-inverting input terminal; and a current transmitting unit connected between the sensing line and the current integrator to separate the electric connection of the sensing line and the current integrator, wherein the current transmitting unit mirrors the pixel current and causes the mirrored current to be output from the inverting input terminal of the integrating amplifier.

公开(公告)号：US10522077B2

公开(公告)日：2019-12-31

申请号：US15365200

申请日：2016-11-30

Applicant: LG DISPLAY CO., LTD.

Inventor： Kyoungdon Woo ,  Chulwon Lee ,  Myunggi Lim ,  Juyoung Noh

IPC: G09G3/3233 ,  G09G3/3266 ,  G09G3/3283 ,  G09G3/3291

Abstract: An organic light-emitting display can include a display panel including sensing lines connected to pixels; a current integrator configured to receive current from a pixel through a sensing line connected to a first input terminal, receive a reference voltage through a reference voltage line connected to a second input terminal, and swap a path through which the current applied through the first input terminal flows and a path through which the reference voltage applied through the second input terminal is supplied; a sampling part including a first sample and hold circuit for sampling a first output voltage of the current integrator and a second sample and hold circuit for sampling a second output voltage of the current integrator, subsequent to the first output voltage, which outputs the first and second output voltages sampled by the first and second sample and hold circuits simultaneously through a single output channel.

公开(公告)号：US11081062B2

公开(公告)日：2021-08-03

申请号：US16573675

申请日：2019-09-17

Applicant: LG Display Co., Ltd.

Inventor： Hyuckjun Kim ,  Bumsik Kim ,  Seungtae Kim ,  Kyoungdon Woo ,  Myunggi Lim ,  Byungjae Lee ,  Minkyu Song

IPC: G09G3/3283 ,  G09G3/3233 ,  G09G3/3258 ,  G01R17/02 ,  H04N5/357

Abstract: The current sensing device in the present disclosure comprises a plurality of sensing units each of which is connected to a sensing channel. The sensing unit may comprise a reference current generator generating a reference current; a current comparator outputting a comparator output signal based on a pixel current input through the sensing channel and the reference current, and removing an offset deviation component included in the pixel current and the reference current by using a reset current externally applied; and an edge triggered data flip-flop outputting a digital sensing value corresponding to the pixel current based on the comparator output signal.

公开(公告)号：US10089928B2

公开(公告)日：2018-10-02

申请号：US15655581

申请日：2017-07-20

Applicant: LG Display Co., Ltd.

Inventor： Jaeik Yoo ,  Myunggi Lim ,  Osung Do

IPC: G09G3/30 ,  G09G3/3233 ,  G09G3/20 ,  G09G3/3275

Abstract: The sensing method for an organic light-emitting display comprises: defining a pixel group comprising a reference pixel and two or more valid pixels, among a plurality of pixels arranged on a horizontal line; obtaining a black level current sensing value by applying a black level data voltage to the reference pixel; obtaining a current sensing value for a given gray level by applying a data voltage for the given gray level higher than the black level to each of the valid pixels; and obtaining a pixel current sensing value by subtracting the black level current sensing value from the current sensing value for the given gray level to eliminate common noise.

公开(公告)号：US20180151121A1

公开(公告)日：2018-05-31

申请号：US15816553

申请日：2017-11-17

Applicant: LG DISPLAY CO., LTD.

Inventor： Myunggi Lim ,  Kyoungdon Woo ,  Jaeyoon Bae

IPC: G09G3/3258

CPC classification number: G09G3/3233 ,  G09G2300/0819 ,  G09G2300/0861 ,  G09G2310/0251 ,  G09G2310/0262 ,  G09G2320/0247 ,  G09G2320/0295

Abstract: An organic light-emitting display includes a driving transistor that drives an organic light-emitting diode, a first transistor connected between a data line supplying a data voltage and a gate electrode of the driving transistor, a second transistor connected between a reference voltage input line and a source electrode of the driving transistor, and a third transistor that directly charges the gate electrode of the driving transistor with a reference voltage supplied from the reference voltage input line, in response to a black data control signal, wherein the third transistor directly receives the reference voltage by being turned on for a certain period of time after the gate electrode of the driving transistor is programmed with the data voltage in one frame before receiving a data voltage in the next frame.