公开(公告)号：US09928782B2

公开(公告)日：2018-03-27

申请号：US15140094

申请日：2016-04-27

Applicant: LG Display Co., Ltd.

Inventor： Osung Do ,  Kyoungdon Woo ,  Seokhyun Hong

IPC: G09G3/3291 ,  G09G3/20

CPC classification number: G09G3/3291 ,  G09G3/2007 ,  G09G2300/0452 ,  G09G2310/027 ,  G09G2310/08 ,  G09G2320/10

Abstract: A four-primary-color organic light emitting display comprises: a display panel where a plurality of first-color pixels, second-color pixels, third-color pixels, and fourth-color pixels are disposed; and a data drive circuit that has a single, digital-to-analog converter to generate first- to fourth-color data voltages and to apply the first-color data voltage to the first-color pixels, the second-color data voltage to the second-color pixels, the third-color data voltage to the third-color pixels, and the fourth-color data voltage to the fourth-color pixels. Herein, the maximum grayscale voltages for the first- to fourth-color data voltages are adjusted to be different on a single gamma graph defined as the input grayscale versus output voltage.

公开(公告)号：US10467960B2

公开(公告)日：2019-11-05

申请号：US15858917

申请日：2017-12-29

Applicant: LG Display Co., Ltd.

Inventor： Osung Do ,  Kyoungdon Woo ,  Hyuckjun Kim ,  Jaeyoon Bae

IPC: G09G3/34 ,  G09G3/3233

Abstract: The present disclosure relates to an electroluminescent display device and a driving method of the same. The electroluminescent display device comprises a display panel, including a plurality of data lines, a plurality of sensing lines, a plurality of gate lines, and pixels which are arranged in matrix at each intersection between those lines to form a plurality of display lines; a sensing circuit, for sensing a pixel current in the pixels, integrating the pixel current to obtain a sensing voltage, and generating a sensing data based on the sensing voltage during a sensing operation period; and a compensation unit for calculating a compensation value for electrical characteristics of the pixels based on the sensing data.

公开(公告)号：US10896644B2

公开(公告)日：2021-01-19

申请号：US16701151

申请日：2019-12-02

Applicant: LG Display Co., Ltd.

Inventor： Osung Do ,  Changwoo Lee

IPC: G09G3/3258 ,  G09G3/20

Abstract: A display device includes a display panel, a driving circuit, a sensing circuit, and a compensation circuit. The display panel includes a first pixel and a second pixel. The driving circuit provides a preset sensing voltage to the first pixel of the display panel, and provides a dummy voltage to the second pixel of the display panel. A first channel of a sensing circuit generates a first integrated voltage signal indicative of a magnitude of a first pixel current generated by the first pixel. A second channel of the sensing circuit generates a second integrated voltage signal indicative of a magnitude of a first dummy current generated by the second pixel. The compensation circuit determines a compensation amount from a difference between an output of the first and second channels of the sensing circuit, and compensates a display voltage of the first pixel by the compensation amount.

公开(公告)号：US10319286B2

公开(公告)日：2019-06-11

申请号：US15783847

申请日：2017-10-13

Applicant: LG Display Co., Ltd.

Inventor： Osung Do ,  Juyoung Noh

IPC: G09G5/00 ,  G09G3/20 ,  G09G3/3225 ,  G09G3/3266 ,  G09G3/3275

Abstract: The display device according to an embodiment of the present disclosure comprises a display panel; a source drive IC configured to provide data voltages to the pixels, convert signals indicating driving characteristics of the pixels into sensing data and output the sensing data; and a timing controller configured to transmit a control data packet and a video data packet to the source drive IC through first and second wire pairs and receive the sensing data from the source drive IC through the second wire pair, wherein the timing controller is configured to load lock information indicating whether a clock extracted from a signal provided from the source drive IC through the second wire pair is locked or not into the control data packet and provide the control data packet to the source drive IC through the first wire pair, when receiving data from the source drive IC.

公开(公告)号：US11030951B2

公开(公告)日：2021-06-08

申请号：US16707990

申请日：2019-12-09

Applicant: LG Display Co., Ltd.

Inventor： Changwoo Lee ,  Jaeik Yoo ,  Osung Do

IPC: G09G3/3275 ,  G09G3/3233 ,  G09G3/3266

Abstract: A light-emitting display includes a display panel, a first circuit, and a second circuit. The display panel comprises a pixel. The first circuit supplies a data voltage to a data line for the pixel. The second circuit performs a sensing operation for sensing a sensing line for the pixel and outputs a voltage required for the sensing operation, and outputs a noise removing voltage for cancelling out noise formed on the sensing line during the sensing operation.

公开(公告)号：US10347692B2

公开(公告)日：2019-07-09

申请号：US15792285

申请日：2017-10-24

Applicant: LG DISPLAY CO., LTD.

Inventor： Taeyoung Lee ,  Changwoo Lee ,  Osung Do

IPC: H01L27/32 ,  G06K9/00 ,  G09F9/30 ,  H01L51/50 ,  H01L51/52 ,  H01L51/56 ,  H05B33/02 ,  H05B33/22 ,  H05B33/28 ,  H01L51/00

Abstract: An organic light emitting display device in an embodiment of the present invention comprises a display panel equipped with a plurality of pixels each including an OLED and a driving TFT for driving the OLED and a sensing circuit connected to pixels through a sensing line and detecting driving characteristics of a corresponding pixel. The sensing circuit may comprise a plural sensing units including an integrator for integrating currents respectively flowing two adjacent sensing lines connected to inverting and non-inverting input terminals of a fully differential amplifier, a sampling unit for respectively sampling two integral outputs of the integrator and a scaler for regulating an operating range of outputs of the sampling unit, a differential amplifier for differentially amplifying one or more outputs of the scaler, and an ADC for converting an output of the differential amplifier into a digital sensing value.

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：US09941018B2

公开(公告)日：2018-04-10

申请号：US14857411

申请日：2015-09-17

Applicant: LG DISPLAY CO., LTD.

Inventor： Seokhyun Hong ,  Chulwon Lee ,  Juyoung Noh ,  Osung Do

IPC: G09G5/00 ,  G11C19/00 ,  G09G3/20 ,  G11C19/28 ,  G09G3/3266 ,  G09G3/36

CPC classification number: G11C19/00 ,  G09G3/20 ,  G09G3/3266 ,  G09G3/3674 ,  G09G2310/0218 ,  G09G2310/0267 ,  G09G2310/0286 ,  G11C19/287

Abstract: A gate driving circuit and a display device using the same are discussed. The gate driving circuit according to an embodiment includes a first shift register configured to sequentially shift a gate start pulse in response to a gate shift clock and output a gate pulse shifted on a per block basis, each block including a plurality of gate lines, a second shift register configured to sequentially shift the gate start pulse in response to the gate shift clock and output a gate pulse shifted on a per gate line basis, and a controller configured to supply the gate shift clock to one of the first and second shift registers.