公开(公告)号：US20220093028A1

公开(公告)日：2022-03-24

申请号：US17465731

申请日：2021-09-02

Applicant: LG Display Co., Ltd.

Inventor： Yewon HONG ,  TaeWoong MOON ,  JunHyeon BAE ,  Yeonkyung KIM ,  Yeonwoo SHIN

IPC: G09G3/20

Abstract: A display device having a gate driver, which may reduce a leakage current of a TFT and power consumption, is disclosed. Each stage of the gate driver comprises an output portion including a pull-up transistor outputting a corresponding clock of a plurality of clocks as a gate signal in response to control of a Q node, and a pull-down transistor outputting a first gate-off voltage as an off-voltage of a gate signal in response to control of a QB node; a controller charging and discharging the Q node and charging and discharging the QB node to be in an opposite state of the Q node; and a back bias circuit having a back bias node capacitance-coupled with the Q node and generating a second gate-off voltage lower than the first gate-off voltage to apply the second gate-off voltage to the back bias node for an off-period of the Q node, wherein the back bias circuit may apply the back gate bias voltage to light shielding layers of some transistors, which are turned off for the off-period of the Q node, among transistors constituting the output portion and the controller, through the back bias node, thereby reducing or minimizing a leakage current of the corresponding transistors.

公开(公告)号：US20200184871A1

公开(公告)日：2020-06-11

申请号：US16504029

申请日：2019-07-05

Applicant: LG DISPLAY CO., LTD.

Inventor： Yewon Hong ,  JungHyun Lee ,  TaeWoong MOON

IPC: G09G3/20 ,  G09G3/3275 ,  G09G3/36

Abstract: A demultiplexer for sequentially outputting a data signal to a plurality of data lines disposed in a display panel can include a first switch connected to a first control node, the first switch being configured to electrically connect a first channel with a first data line among the plurality of data lines; a second switch connected to a second control node, the first switch being configured to electrically connect the first channel with a second data line among the plurality of data lines; a third switch connected to a third control node, the third switch being configured to electrically connect a second channel with a third data line among the plurality of data lines; and a fourth switch connected to a fourth control node, the fourth switch being configured to electrically connect the second channel with a fourth data line among the plurality of data lines, in which the first control node and the third control node are configured to receive a single first control signal, and be electrically disconnected from each other at a point in time, the second control node and the fourth control node are configured to receive a single second control signal, and be electrically disconnected from each other at a point in time, and the first control node and the third control node have different voltage conditions than the second control node and the fourth control node.

公开(公告)号：US20220199033A1

公开(公告)日：2022-06-23

申请号：US17550818

申请日：2021-12-14

Applicant: LG Display Co., Ltd.

Inventor： Yewon HONG ,  Yeonwoo SHIN ,  TaeWoong MOON

IPC: G09G3/3266 ,  G09G3/3275

Abstract: One or more embodiments of the present disclosure relate to a display device and a gate driving circuit. There is further provided with a synchronization transistor controlled according to a voltage of a Q node of a m-th scan driver (e.g., a second scan driver) and controlling an electrical connection between an output terminal of the n-th light emitting driver and a clock input terminal of the m-th scan driver, so that the rising characteristic and/or the falling characteristic of the light emission signal which is a type of the gate signal can be improved, thereby improving a threshold voltage compensation performance of the driving transistor and the image quality.

公开(公告)号：US20140091996A1

公开(公告)日：2014-04-03

申请号：US13728028

申请日：2012-12-27

Applicant: LG DISPLAY CO., LTD.

Inventor： TaeWoong MOON ,  YounGyoung CHANG ,  ChongHun PARK ,  IlKi JUNG

IPC: G09G3/36

CPC classification number: G09G3/3685 ,  G09G2300/0413 ,  G09G2310/0297 ,  G09G2320/045

Abstract: The present invention relates to a liquid crystal display (LCD) device. More particularly, the present invention relates to an LCD device including a thin film transistor (TFT) compensation circuit in an LCD device which implements a driving circuit by using an oxide TFT, the LCD device capable of compensating for degraded characteristics of a TFT due to threshold voltage shift. As the compensation circuit including a dummy TFT is formed on a non-active area of the LC panel, the degree of threshold voltage shift of the DT due to a DC voltage can be sensed. Based on the sensed result, a threshold voltage of a second TFT can be compensated. This can reduce lowering of a device characteristic.

Abstract translation: 本发明涉及液晶显示（LCD）装置。 更具体地说，本发明涉及一种LCD装置，其包括在通过使用氧化物TFT实现驱动电路的LCD装置中的薄膜晶体管（TFT）补偿电路，该LCD装置能够补偿由于 阈值电压偏移。 由于包括虚拟TFT的补偿电路形成在LC面板的非有源区域上，所以可以感测到由于DC电压引起的DT的阈值电压偏移程度。 基于感测结果，可以补偿第二TFT的阈值电压。 这可以降低设备特性的降低。

公开(公告)号：US20230033999A1

公开(公告)日：2023-02-02

申请号：US17870065

申请日：2022-07-21

Applicant: LG DISPLAY CO., LTD.

Inventor： Seunghyo KO ,  Nuri ON ,  TaeWoong MOON

IPC: H01L29/786 ,  H01L27/32 ,  H01L29/66

Abstract: A thin film transistor for a display device includes an active layer, and a gate electrode spaced apart from the active layer and at least partially overlapping with the active layer, wherein the active layer includes copper, and has a concentration gradient of copper along a thickness direction of the active layer.

公开(公告)号：US20220069573A1

公开(公告)日：2022-03-03

申请号：US17366445

申请日：2021-07-02

Applicant: LG Display Co., Ltd.

Inventor： Yeonkyung KIM ,  TaeWoong MOON ,  JunHyeon BAE ,  Yewon HONG ,  Yeonwoo SHIN

IPC: H02H9/04 ,  H01L27/02 ,  G09G3/20

Abstract: A display apparatus comprises a display panel on which a plurality of pixels are displayed, a plurality of signal lines to which a signal required to drive the display panel is supplied, and an electrostatic discharge circuit connected between each of the plurality of signal lines and the electrostatic discharge line. The electrostatic discharge circuit includes first and second current paths between the signal line and the electrostatic discharge line, a first electrostatic discharge circuit connected to the first current path, including a plurality of first thin film transistors having a first gate electrode connected to the second current path and a second gate electrode connected to the first current path, and a second electrostatic discharge circuit connected to the second current path, including at least one second thin film transistor having a first gate electrode connected to the first current path and a second gate electrode connected to the first current path.

公开(公告)号：US20190114980A1

公开(公告)日：2019-04-18

申请号：US16158248

申请日：2018-10-11

Applicant: LG Display Co., Ltd.

Inventor： Yeonkyung KIM ,  TaeWoong MOON ,  JungHyun LEE ,  YongSeok PARK

IPC: G09G3/36 ,  G06F3/041 ,  G06F3/044 ,  G02F1/1333 ,  G02F1/1368 ,  G02F1/1362

Abstract: Disclosed is a display apparatus including a gate driving circuit, which stably holds an output signal during a touch sensing period. The display apparatus includes a display panel including a display area including a plurality of gate lines, a plurality of data lines, and a plurality of touch sensors, a gate driving circuit dividing the display area into a plurality of horizontal blocks and driving gate lines of a horizontal block by units of horizontal blocks at every display period in one frame, and a touch driving circuit sensing a touch through touch sensors of the horizontal block by units of horizontal blocks at every touch sensing period in the one frame. The gate driving circuit includes a plurality of driving stage groups each including a plurality of driving stages supplying a scan pulse to gate lines included in a corresponding horizontal block at every display period and a plurality of holding stage groups each including at least one holding stage supplying a carry signal to a rear driving stage group according to a voltage of a first control node and a voltage of a second control node based on first and second node control powers and an output signal supplied from a front driving stage group, the plurality of holding stages being disposed between the plurality of driving stage groups. Each of the first and second node control powers includes an alternating current (AC) voltage.