Patents by Inventor YoungJang Lee
YoungJang Lee has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20220199835Abstract: Provided are a display device and a method for manufacturing the same. The display device includes: a connection source electrode and a connection drain electrode connected to a first source electrode a the first drain electrode, respectively by penetrating an isolation insulating layer and a second interlayer dielectric layer to enhance a characteristic of an element and reliability of the display device.Type: ApplicationFiled: March 8, 2022Publication date: June 23, 2022Inventors: SoYoung NOH, YoungJang LEE, HyoJin KIM, Hyuk JI
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Publication number: 20220190003Abstract: The present disclosure relates to a thin film transistor substrate having two different types of thin film transistors on the same substrate. A thin film transistor substrate includes a substrate; a first thin film transistor disposed on the substrate, the first thin film transistor including a poly crystalline semiconductor layer, a first gate electrode over the poly crystalline semiconductor layer, a first source electrode, and a first drain electrode; a second thin film transistor disposed on the substrate, the second thin film transistor including a second gate electrode, an oxide semiconductor layer over the second gate electrode, a second source electrode, and a second drain electrode; and an intermediate insulating layer including a nitride layer and an oxide layer on the nitride layer, the intermediate insulating layer disposed over the first gate electrode and the second gate electrode and under the oxide semiconductor layer.Type: ApplicationFiled: March 4, 2022Publication date: June 16, 2022Applicant: LG Display Co., Ltd.Inventors: Youngjang LEE, Kyungmo SON, Sohyung LEE, Moonho PARK, Sungjin LEE
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Patent number: 11335757Abstract: The pixel circuit which controls the driving of the organic light emitting diode includes a driving TFT which supplies a driving current to the organic light emitting diode; a sampling TFT which samples a threshold voltage of the driving TFT; a first initializing TFT which supplies an initialization voltage to one electrode of the organic light emitting diode; and a storage capacitor which stores a voltage applied to the driving TFT, and at least one of the driving TFT, the sampling TFT, and the first initializing TFT includes a shielding electrode disposed between the substrate and the active layer. Therefore, even though the external light is irradiated onto a transparent substrate, a full white gray-level and a full black gray-level can be expressed so that the gray-level expressiveness may not be degraded.Type: GrantFiled: August 4, 2020Date of Patent: May 17, 2022Assignee: LG Display Co., Ltd.Inventors: Aram Kim, JaeHoon Park, YoungJang Lee, SeonYeong Kim
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Patent number: 11302821Abstract: Provided are a display device and a method for manufacturing the same. The display device includes: a connection source electrode and a connection drain electrode connected to a first source electrode a the first drain electrode, respectively by penetrating an isolation insulating layer and a second interlayer dielectric layer to enhance a characteristic of an element and reliability of the display device.Type: GrantFiled: October 24, 2019Date of Patent: April 12, 2022Assignee: LG Display Co., Ltd.Inventors: SoYoung Noh, YoungJang Lee, HyoJin Kim, Hyuk Ji
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Patent number: 10985196Abstract: Provided are a thin film transistor substrate and a display using the same. A thin film transistor substrate includes: a substrate, a first thin film transistor disposed on the substrate, the first thin film transistor including: a polycrystalline semiconductor layer, a first gate electrode on the polycrystalline semiconductor layer, a first source electrode, and a first drain electrode, a second thin film transistor disposed on the substrate, the second thin film transistor including: a second gate electrode, an oxide semiconductor layer on the second gate electrode, a second source electrode, and a second drain electrode, an intermediate insulating layer including a nitride layer and an oxide layer on the nitride layer, the intermediate insulating layer being disposed on the first gate electrode and the second gate electrode and under the oxide semiconductor layer, and an etch-stopper layer disposed on the oxide semiconductor layer.Type: GrantFiled: February 23, 2015Date of Patent: April 20, 2021Assignee: LG Display Co., Ltd.Inventors: Youngjang Lee, Kyungmo Son, Sohyung Lee, Hoyoung Jung, Moonho Park, Sungjin Lee
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Patent number: 10923036Abstract: A display panel and an electroluminescence display using the same are discussed. The display panel includes pixels in which data lines and gate lines are crossed and which are arranged in a matrix form, and a gate driver configured to supply a gate pulse to the gate lines. Each pixel circuit of the pixels includes one or more n-type transistors and two or more p-type transistors. A gate driver of the display panel includes a first gate driving circuit configured to supply a first gate signal to an n-type transistor of the pixel circuit using a plurality of n-type transistors, a second gate driving circuit configured to supply a second gate signal to one of the p-type transistors of the pixel circuit using a plurality of p-type transistors, and a third gate driving circuit configured to supply a third gate signal to the other one of the p-type transistors of the pixel circuit using a plurality of n-type transistors.Type: GrantFiled: August 1, 2017Date of Patent: February 16, 2021Assignee: LG DISPLAY CO., LTD.Inventor: Youngjang Lee
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Publication number: 20210043709Abstract: According to an aspect of the present disclosure, The pixel circuit which controls the driving of the organic light emitting diode includes a driving TFT which supplies a driving current to the organic light emitting diode; a sampling TFT which samples a threshold voltage of the driving TFT; a first initializing TFT which supplies an initialization voltage to one electrode of the organic light emitting diode; and a storage capacitor which stores a voltage applied to the driving TFT, and at least one of the driving TFT, the sampling TFT, and the first initializing TFT includes a shielding electrode disposed between the substrate and the active layer. Therefore, even though the external light is irradiated onto a transparent substrate, a full white gray-level and a full black gray-level can be expressed so that the gray-level expressiveness may not be degraded.Type: ApplicationFiled: August 4, 2020Publication date: February 11, 2021Inventors: Aram KIM, JaeHoon PARK, YoungJang LEE, SeonYeong KIM
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Patent number: 10908722Abstract: The present disclosure relates to a sensing device and a display device including the sensing device. The sensing device includes a transducer including first and second driving electrodes and a piezoelectric material layer; first and second transmission transistors for alternatively supplying first and second driving voltages to the first driving electrode; and first and second reception transistors electrically connected between a readout line and a power supply line to which a power supply voltage is supplied. During an interval in which at least one pixel is driven, the first and second driving voltages are DC voltages with a voltage level different from each other, and the first and second transmission transistors repeat turn-on and turn-off at a timing different from each other. Through this, it is possible to reduce unnecessary power consumption, and therefore, a large area fingerprint sensor can be more efficiently implemented.Type: GrantFiled: July 17, 2019Date of Patent: February 2, 2021Assignee: LG Display Co., Ltd.Inventors: YoungJang Lee, JunHo Lee
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Patent number: 10903246Abstract: Provided are a thin film transistor substrate and a display using the same. A display includes: a first area, a second area, a first thin film transistor disposed at the first area, the first thin film transistor including: a polycrystalline semiconductor layer, a first gate electrode on the polycrystalline semiconductor layer, a first source electrode, and a first drain electrode, a second thin film transistor disposed at the second area, the second thin film transistor including: a second gate electrode, an oxide semiconductor layer on the second gate electrode, a second source electrode, and a second drain electrode, a nitride layer on an area of the display device, other than the second area, the nitride layer covering the first gate electrode, and an oxide layer disposed over the first gate electrode and the second gate electrode.Type: GrantFiled: February 24, 2015Date of Patent: January 26, 2021Assignee: LG Display Co., Ltd.Inventors: Youngjang Lee, Kyungmo Son, Seongpil Cho, Jaehoon Park, Sohyung Lee, Sangsoon Noh, Moonho Park, Sungjin Lee, Seunghyo Ko, Mijin Jeong
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Patent number: 10672849Abstract: A pixel of an organic light emitting display device includes a driving thin film transistor (TFT) on a substrate, a switching TFT on the substrate, and an organic light emitting diode (OLED) on the substrate. The driving TFT includes a first active layer including poly-Si, a first insulation layer on the first active layer, and a first source electrode and a first drain electrode contacting the first active layer. At least a portion of the first source electrode and at least a portion of the first drain electrode are disposed on different layers. The switching TFT is electrically connected to the driving TFT, and the switching TFT includes a second active layer including oxide semiconductor material. The OLED is electrically connected to the driving TFT.Type: GrantFiled: June 15, 2017Date of Patent: June 2, 2020Assignee: LG Display Co., Ltd.Inventor: YoungJang Lee
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Publication number: 20200167026Abstract: The present disclosure relates to a sensing device and a display device including the sensing device. The sensing device includes a transducer including first and second driving electrodes and a piezoelectric material layer; first and second transmission transistors for alternatively supplying first and second driving voltages to the first driving electrode; and first and second reception transistors electrically connected between a readout line and a power supply line to which a power supply voltage is supplied. During an interval in which at least one pixel is driven, the first and second driving voltages are DC voltages with a voltage level different from each other, and the first and second transmission transistors repeat turn-on and turn-off at a timing different from each other. Through this, it is possible to reduce unnecessary power consumption, and therefore, a large area fingerprint sensor can be more efficiently implemented.Type: ApplicationFiled: July 17, 2019Publication date: May 28, 2020Inventors: YoungJang LEE, JunHo LEE
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Patent number: 10614740Abstract: Provided are a display device and method of driving the same. A display device includes: a display panel including: data lines and gate lines intersecting each other, and pixels in a matrix, a timing controller configured to reduce a refresh rate of the pixels in a low-speed driving mode compared to a refresh rate of the pixels in a normal driving mode, and a display panel driving circuit configured to: write data to the display panel, write data to the pixels during N driving frame periods within a unit of time, that is set to the refresh rate of the low-speed driving mode, under the control of the timing controller, where āNā is a positive integer of 2 to 4, wherein the pixels are configured to hold a voltage of previous data for a remaining time other than the N driving frame periods of the unit of time.Type: GrantFiled: September 27, 2016Date of Patent: April 7, 2020Assignee: LG Display Co., Ltd.Inventors: Junho Lee, Youngjang Lee
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Publication number: 20200058797Abstract: Provided are a display device and a method for manufacturing the same. The display device includes: a connection source electrode and a connection drain electrode connected to a first source electrode a the first drain electrode, respectively by penetrating an isolation insulating layer and a second interlayer dielectric layer to enhance a characteristic of an element and reliability of the display device.Type: ApplicationFiled: October 24, 2019Publication date: February 20, 2020Inventors: SoYoung NOH, YoungJang LEE, HyoJin KIM, Hyuk JI
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Patent number: 10565936Abstract: An organic light emitting display device and a driving method thereof are provided. The organic light emitting display device comprising a display panel including a plurality of pixels, each pixel including an organic light emitting element, a data driver supplying a data signal to the organic light emitting element through a data line, a gate driver supplying a gate signal to the organic light emitting element through a gate line, and a timing controller controlling an operation timing of the data driver and an operation timing of the gate driver, and generating a conversion control signal controlling a conversion timing of a refresh rate of the display panel in response to an external input signal of the display panel.Type: GrantFiled: December 6, 2017Date of Patent: February 18, 2020Assignee: LG Display Co., Ltd.Inventors: SungBin Ryu, JunHo Lee, YoungJang Lee
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Patent number: 10490668Abstract: Provided are a display device and a method for manufacturing the same. The display device includes: a connection source electrode and a connection drain electrode connected to a first source electrode a the first drain electrode, respectively by penetrating an isolation insulating layer and a second interlayer dielectric layer to enhance a characteristic of an element and reliability of the display device.Type: GrantFiled: October 26, 2017Date of Patent: November 26, 2019Assignee: LG Display Co., Ltd.Inventors: SoYoung Noh, YoungJang Lee, HyoJin Kim, Hyuk Ji
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Publication number: 20190237493Abstract: The present disclosure relates to a thin film transistor substrate having two different types of thin film transistors on the same substrate. A thin film transistor substrate includes a substrate; a first thin film transistor disposed on the substrate, the first thin film transistor including a poly crystalline semiconductor layer, a first gate electrode over the poly crystalline semiconductor layer, a first source electrode, and a first drain electrode; a second thin film transistor disposed on the substrate, the second thin film transistor including a second gate electrode, an oxide semiconductor layer over the second gate electrode, a second source electrode, and a second drain electrode; and an intermediate insulating layer including a nitride layer and an oxide layer on the nitride layer, the intermediate insulating layer disposed over the first gate electrode and the second gate electrode and under the oxide semiconductor layer.Type: ApplicationFiled: April 5, 2019Publication date: August 1, 2019Applicant: LG Display Co., Ltd.Inventors: Youngjang LEE, Kyungmo SON, Sohyung LEE, Moonho PARK, Sungjin LEE
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Patent number: 10325937Abstract: The present disclosure relates to a thin film transistor substrate having two different types of thin film transistors on the same substrate. A thin film transistor substrate includes a substrate; a first thin film transistor disposed on the substrate, the first thin film transistor including a poly crystalline semiconductor layer, a first gate electrode over the poly crystalline semiconductor layer, a first source electrode, and a first drain electrode; a second thin film transistor disposed on the substrate, the second thin film transistor including a second gate electrode, an oxide semiconductor layer over the second gate electrode, a second source electrode, and a second drain electrode; and an intermediate insulating layer including a nitride layer and an oxide layer on the nitride layer, the intermediate insulating layer disposed over the first gate electrode and the second gate electrode and under the oxide semiconductor layer.Type: GrantFiled: February 23, 2015Date of Patent: June 18, 2019Assignee: LG Display Co., Ltd.Inventors: Youngjang Lee, Kyungmo Son, Sohyung Lee, Moonho Park, Sungjin Lee
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Patent number: 10186528Abstract: Provided are a thin film transistor substrate and a display using the same. A thin film transistor substrate includes: a substrate, a first thin film transistor disposed at a first area of the substrate, the first thin film transistor including: a polycrystalline semiconductor layer, a first gate electrode on the polycrystalline semiconductor layer, a first source electrode, and a first drain electrode, a second thin film transistor disposed at a second area of the substrate, the second thin film transistor including: a second gate electrode, an oxide semiconductor layer on the second gate electrode, a second source electrode, and a second drain electrode, a nitride layer disposed on an area of the substrate, other than the second area, the nitride layer covering the first gate electrode, and an oxide layer disposed: over the first gate electrode and the second gate electrode, and under the oxide semiconductor layer.Type: GrantFiled: February 23, 2015Date of Patent: January 22, 2019Assignee: LG Display Co., Ltd.Inventors: Youngjang Lee, Kyungmo Son, Seongpil Cho, Jaehoon Park, Sohyung Lee, Sangsoon Noh, Moonho Park, Sungjin Lee, Seunghyo Ko, Mijin Jeong
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Publication number: 20190006521Abstract: Provided are a display device and a method for manufacturing the same. The display device includes: a connection source electrode and a connection drain electrode connected to a first source electrode a the first drain electrode, respectively by penetrating an isolation insulating layer and a second interlayer dielectric layer to enhance a characteristic of an element and reliability of the display device.Type: ApplicationFiled: October 26, 2017Publication date: January 3, 2019Inventors: SoYoung NOH, YoungJang LEE, HyoJin KIM, Hyuk JI
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Patent number: 10170049Abstract: Provided are a display device and method of driving the same. A display device includes: a display panel including: intersecting data lines and gate lines, and pixels in a matrix, a timing controller allowing the pixels to be driven at a lower refresh rate in low-speed driving mode than in normal driving mode, and controlling a horizontal blank time to be longer in the low-speed driving mode than the normal driving mode, the horizontal blank time being a period of time during which no data voltage exists, between an nth data voltage and an (n+1)th data voltage consecutively supplied through the data lines, ānā being a positive integer, and a display panel driving circuit writing one frame of image data to the pixels during one frame period in the normal driving mode, and in a distributed manner during a second to fourth frame period in the low-speed driving mode.Type: GrantFiled: September 23, 2016Date of Patent: January 1, 2019Assignee: LG Display Co., Ltd.Inventors: Sungbin Ryu, Youngjang Lee