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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.
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公开(公告)号：US11263988B2
公开(公告)日：2022-03-01
申请号：US15723958
申请日：2017-10-03
Applicant: LG Display Co., Ltd.
Inventor： Yeonkyung Kim , Taewoong Moon , Junghyun Lee
IPC: G11C19/00 , G09G3/36 , G09G3/3266 , G06F3/041 , G11C19/28
Abstract: The present disclosure relates to a gate driving circuit and a display device using the circuit. A gate driving circuit according to an aspect of the present disclosure comprises a Q node controller, a QB node controller, and an output unit generating a pulse-type output signal by controlling charging and discharging of an output terminal according to the voltages of the Q node and the QB node, and the QB node controller controls the voltage of the QB node in an alternating manner during a non-scan period in which the Q node controller outputs a low level voltage for the Q node.
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公开(公告)号：US11322068B2
公开(公告)日：2022-05-03
申请号：US17465723
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 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 back gate bias voltage to apply the back gate bias 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.
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公开(公告)号：US10573225B2
公开(公告)日：2020-02-25
申请号：US15720869
申请日：2017-09-29
Applicant: LG DISPLAY CO., LTD.
Inventor： Junghyun Lee , Taewoong Moon , Yeonkyung Kim
Abstract: A gate drive circuit and a display device are provided. The gate drive circuit comprises: a first stage that outputs a first gate pulse at a first output terminal by increasing a voltage at the first output terminal when a first Q node is charged in response to receiving a first carry signal at a first start terminal, and decreasing the voltage at the first output terminal when a first QB node is charged; and a second stage that outputs a second gate pulse at a second output terminal and outputs a second carry signal at a third output terminal by increasing voltages at the second and third output terminals when a second Q node is charged in response to receiving the first carry signal at a second start terminal, and decreasing the voltages at the second and third output terminals when a second QB node is charged.
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公开(公告)号：US10534477B2
公开(公告)日：2020-01-14
申请号：US15798011
申请日：2017-10-30
Applicant: LG DISPLAY CO., LTD.
Inventor： Yeonkyung Kim , Taewoong Moon , Junghyun Lee
Abstract: A gate driver and a display device having an in-cell touch sensor using the gate driver are disclosed. The gate driver includes a shift register configured to sequentially supply gate pulses to gate lines of a display panel. The shift register includes an (N−1)th stage, where N is a positive integer equal to or greater than 2, configured to output an (N−1)th gate pulse, an Nth stage configured to output an Nth gate pulse, and a hold circuit configured to hold an output voltage of the (N−1)th stage during a predetermined time and supply the output voltage to the Nth stage.
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Patent Agency Ranking
公开(公告)号：US11468812B2
公开(公告)日：2022-10-11
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
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.
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公开(公告)号：US11443674B2
公开(公告)日：2022-09-13
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.
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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.
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公开(公告)号：US11769454B2
公开(公告)日：2023-09-26
申请号：US17895907
申请日：2022-08-25
Applicant: LG Display Co., Ltd.
Inventor： Yeonkyung Kim
IPC: G09G3/3233 , G09G3/3266 , H10K59/126
CPC classification number: G09G3/3233 , G09G3/3266 , H10K59/126 , G09G2300/0819 , G09G2300/0852 , G09G2300/0861 , G09G2310/0291 , G09G2330/021
Abstract: A display panel and a display device having an emission control driver are discussed. The display device can include a display panel for displaying an image through sub pixels, and an emission control driver configured to supply a plurality of emission control signals to the sub pixels. The emission control driver can include a plurality of emission control stages configured to supply the plurality of emission control signals, respectively. Each emission control stage can include an output buffer including a first pull-up transistor configured to output a first high potential power supply voltage to an output line by a Q node, and a first pull-down transistor configured to output a first low potential power supply voltage to the output line by a QB node.
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公开(公告)号：US20220093027A1
公开(公告)日：2022-03-24
申请号：US17465723
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 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 back gate bias voltage to apply the back gate bias 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.
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