公开(公告)号：US11222575B2

公开(公告)日：2022-01-11

申请号：US16131283

申请日：2018-09-14

Applicant: LG Display Co., Ltd.

Inventor： YongSeok Park ,  Hyelim Ji

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

Abstract: Provided are a shift register and display apparatus including the same. A shift register includes a plurality of stages, each of the plurality of stages including: a node controller configured to: periodically discharge a first node voltage generated from a first driving voltage during a first voltage level of a clock signal, and control a second node voltage opposite to the first node voltage based on a second driving voltage, and an output part configured to receive the clock signal to output an output signal based on the first node voltage.

公开(公告)号：US20230074433A1

公开(公告)日：2023-03-09

申请号：US17901793

申请日：2022-09-01

Applicant: LG Display Co., Ltd.

Inventor： HyunCheol Cho ,  Hyelim Ji ,  Yeonkyung Kim

IPC: H01L29/786 ,  H01L29/417 ,  H01L27/32

Abstract: A thin film transistor substrate and a display device comprising the same are provided, in which the thin film transistor substrate comprises a first thin film transistor on a base substrate, and a second thin film transistor on the first thin film transistor, wherein the first thin film transistor includes a first active layer on the base substrate, a first gate electrode spaced apart from the first active layer, and a first source electrode and a first drain electrode, which are spaced apart from each other and connected to the first active layer, the second thin film transistor includes a second active layer on the base substrate, a second gate electrode spaced apart from the second active layer, and a second source electrode and a second drain electrode, which are spaced apart from each other and connected to the second active layer, and one of the first source electrode and the first drain electrode is connected to one of the second source electrode and the second drain electrode.

公开(公告)号：US11004384B2

公开(公告)日：2021-05-11

申请号：US16590149

申请日：2019-10-01

Applicant: LG Display Co., Ltd.

Inventor： Hyelim Ji ,  YongSeok Park

IPC: G09G3/32 ,  H01L33/36 ,  H01L33/62

Abstract: A display apparatus can include a first transistor disposed on a substrate, the first transistor including a first active layer made of low temperature polycrystalline silicon (LTPS); a circuit insulating layer disposed on the first transistor; a second transistor disposed on the circuit insulating layer, the second transistor including a second active layer made of an oxide semiconductor; a driving transistor disposed on the circuit insulating layer, the driving transistor having a back channel etch structure (BCE) and an active layer made of the oxide semiconductor; and a light emitting diode electrically connected to the driving transistor, in which the circuit insulating layer is disposed between the first transistor and the driving and second transistors.

公开(公告)号：US11024245B2

公开(公告)日：2021-06-01

申请号：US15798004

申请日：2017-10-30

Applicant: LG DISPLAY CO., LTD.

Inventor： Hyelim Ji ,  Yongseok Park

IPC: G09G3/36 ,  G11C19/28 ,  H03K17/687

Abstract: A gate driver and a display device using the same are disclosed. The gate driver includes a plurality of stages connected in a cascade connection manner, and each of the stages include a clock input configured to receive a shift clock signal, a first output terminal, and a second output terminal. Each of the stages generates a first output voltage that is transmitted to another stage through the first output terminal and a second output voltage that is supplied to a gate line of a display panel through the second output terminal. Each of the stages includes a first diode connected between the clock input and the first output terminal.

公开(公告)号：US10210836B2

公开(公告)日：2019-02-19

申请号：US15799516

申请日：2017-10-31

Applicant: LG DISPLAY CO., LTD.

Inventor： Yongseok Park ,  Hyelim Ji

IPC: G09G3/36 ,  H01L27/12 ,  H01L29/423 ,  H01L29/786 ,  G02F1/1333 ,  G02F1/1335 ,  G02F1/1362 ,  G02F1/1368

Abstract: A gate driver and a display device using the same are disclosed. The gate driver includes a first transistor configured to pre-charge a Q node, a second transistor configured to raise the output voltage depending on a voltage of the Q node, a third transistor configured to charge a QB node, a fourth transistor configured to lower the output voltage depending on a voltage of the QB node, and a capacitor connected between a gate and a source in at least one of the second transistor and the third transistor. The capacitor has a capacitance greater than a capacitance between the gate and a drain of the transistor to which the capacitor is connected. The capacitor includes an upper capacitor disposed on an organic passivation layer covering the transistors.

公开(公告)号：US11869442B2

公开(公告)日：2024-01-09

申请号：US17899259

申请日：2022-08-30

Applicant: LG Display Co., Ltd.

Inventor： Hyelim Ji ,  Yeonkyung Kim

IPC: G09G3/3266

CPC classification number: G09G3/3266 ,  G09G2300/0842 ,  G09G2310/0291

Abstract: A display panel and a display device having an emission control driver are discussed. The display device can include a display panel to display an image through sub pixels, a scan driver to supply a second scan signal to each of second gate lines, and an emission control driver to supply an emission control signal to each of third gate lines and supply a first scan signal to each of first gate lines. Each emission control stage of the emission control driver can include an output buffer. The output buffer can output an emission control signal to an output line and output a first scan signal to a scan output line under control of a first control node, and output a high potential power supply voltage to the output line and output a low potential power supply voltage to the scan output line under control of a second control node.

公开(公告)号：US11790856B2

公开(公告)日：2023-10-17

申请号：US17900485

申请日：2022-08-31

Applicant: LG Display Co., Ltd.

Inventor： Hyelim Ji

IPC: G09G3/3225 ,  G09G3/3266 ,  G09G3/3275

CPC classification number: G09G3/3266 ,  G09G2300/0842 ,  G09G2310/0291

Abstract: A display device can include a display panel configured to display an image through sub pixels, a first scan driver configured to supply a plurality of first scan signals to a plurality of first gate lines connected to the sub pixels, and an emission control driver configured to supply a plurality of emission control signals to a plurality of third gate lines connected to the sub pixels. The emission control driver includes a plurality of emission control stages configured to supply the plurality of emission control signals, respectively. Each of the plurality of emission control stages can include an output buffer including a first output transistor configured to output a clock signal to an output line by controlling a Q node, and a second output transistor configured to output a high potential power supply voltage to the output line by controlling a QB node.

公开(公告)号：US10937852B2

公开(公告)日：2021-03-02

申请号：US16163779

申请日：2018-10-18

Applicant: LG Display Co., Ltd.

Inventor： Yewon Hong ,  SungSoo Shin ,  Hyelim Ji ,  Sohee Choi

IPC: H01L27/32 ,  G09G3/3275 ,  G09G3/3266 ,  G09G3/3233 ,  G09G3/3291

Abstract: A display apparatus includes a plurality of pixels each including an organic light emitting device and a pixel driving circuit. The pixel driving circuit includes a driving transistor controlling a driving current flowing in the organic light emitting device and a first, second, third, fourth, and fifth switching transistor, the third switching transistor selectively connecting a second node which is a drain electrode of the driving transistor to a third node which is a gate electrode of the driving transistor. The third switching transistor differs from a type of each of the driving transistor and the first, second, fourth, and fifth switching transistors. Accordingly, even when the organic light emitting display apparatus is driven at a low frequency, a bezel area is reduced, and a high resolution of a display panel is realized.