公开(公告)号：US20240210758A1

公开(公告)日：2024-06-27

申请号：US18520302

申请日：2023-11-27

Applicant: LG Display Co., Ltd.

Inventor： Changwoo Lee ,  SunYoon Kim ,  Min Kim ,  Sanggoo Jeong ,  Juyoung Noh

IPC: G02F1/1335 ,  G02F1/13357 ,  G09G3/32

CPC classification number: G02F1/133612 ,  G02F1/133603 ,  G09G3/32 ,  G09G2300/0842 ,  G09G2310/027 ,  G09G2310/0286 ,  G09G2310/0297

Abstract: The present disclosure relates to a backlight unit, a display device, and a driving method. A sensing MUX circuit senses a voltage of a first light emitting node and a voltage of a second light emitting node, and then, detects whether a first light source connected between the first light emitting node and the second light emitting node is defective, whereby it is possible to specify and detect a defective light source.

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：US11328664B2

公开(公告)日：2022-05-10

申请号：US16693153

申请日：2019-11-22

Applicant: LG Display Co., Ltd.

Inventor： Seokhyun Hong ,  Changwoo Lee

IPC: G09G3/3233 ,  G09G3/3241 ,  G09G3/325

Abstract: The present disclosure relates to a pixel sensing device and the organic light emitting display device including the same which reduce or minimize the influence of the panel noise and improve sensing accuracy and sensing reliability. The pixel sensing device includes a current integrator connected to a pixel through a sensing line of a display panel and integrating a pixel current flowing through the pixel to generate an integrator output voltage; a sample and hold unit sampling and holding the integrator output voltage; an analog to digital converter (ADC) converting the integrator output voltage output from the sample and hold unit into a digital signal; and a first capacitor serving to reduce or minimize a distortion degree of the integrator output voltage due to panel noise mixed to the pixel current.

公开(公告)号：US10249248B2

公开(公告)日：2019-04-02

申请号：US15823406

申请日：2017-11-27

Applicant: LG Display Co., Ltd.

Inventor： Changwoo Lee ,  Jeongtae Hwang ,  Byungjae Lee

IPC: G09G3/3275 ,  G09G3/3233 ,  G09G3/3291 ,  G09G3/3258 ,  G09G3/00

Abstract: The present disclosure provides a display device. The display device may comprise a display panel including a plurality of pixels, a reference current source providing a reference current, and a source drive IC including sensing units for sampling a signal input from the pixel through a sensing line and an ADC connected to the sensing units and obtaining sensing data related to a driving of the pixel. The source drive IC may further comprise a switch array connecting the sensing lines and the sensing units, and the switch array in each sensing unit may comprise a first switch for connecting a corresponding sensing unit to a first sensing line corresponding to the corresponding sensing unit and a second switch for connecting the corresponding sensing unit to a second sensing line adjacent and previous to the first sensing line or the reference current source.

公开(公告)号：US12165566B2

公开(公告)日：2024-12-10

申请号：US18511490

申请日：2023-11-16

Applicant: LG Display Co., Ltd.

Inventor： SunYoon Kim ,  Jin-Hyun Jung ,  Byungjae Lee ,  Changwoo Lee

IPC: G09G5/00 ,  G09G3/20 ,  G09G3/32

Abstract: Discussed are a display panel and a display device having the same. The display panel includes a plurality of subpixels. A gate line, a data line, and a reference voltage line are further disposed on the display panel. A gate driving circuit supplies a scan signal to the gate line. A data driving circuit converts image data into a data voltage and supplies the data voltages to the data line. A timing controller controls the gate driving circuit and the data driving circuit and generates compensation data for the image data using a sensing voltage detected through the reference voltage line. The display panel includes a plurality of sensing transistors disposed around a corresponding subpixel among the plurality of subpixels to connect the data line and the reference voltage line.

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.