Patents by Inventor Gunwoo YANG
Gunwoo YANG 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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Patent number: 11887521Abstract: A pixel circuit may include a light-emitting element, a driving transistor which applies a driving current to the light-emitting element, a storage capacitor connected to a control electrode of the driving transistor, a data voltage-applying transistor which applies a data voltage to the storage capacitor, an emission transistor which connects the driving transistor to the light-emitting element in response to an emission signal, and a bias capacitor disposed between a first electrode of the driving transistor and a control electrode of the emission transistor.Type: GrantFiled: July 7, 2022Date of Patent: January 30, 2024Assignee: SAMSUNG DISPLAY CO., LTD.Inventor: Gunwoo Yang
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Publication number: 20230267882Abstract: A pixel includes a first capacitor electrically connected between a first node and a second node, a second capacitor electrically connected between a first driving voltage line providing a first driving voltage and the first node, a light emitting diode including a first electrode and a second electrode electrically connected with a second driving voltage line providing a second driving voltage, first to fourth transistors, each including a first electrode, a second electrode, and a gate.Type: ApplicationFiled: November 7, 2022Publication date: August 24, 2023Applicant: Samsung Display Co., Ltd.Inventor: GUNWOO YANG
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Publication number: 20230232660Abstract: A display apparatus includes a first pixel circuit and a second pixel circuit. The first pixel circuit includes a first driving transistor and a first storage capacitor having a first lower storage electrode connected to a gate of the first driving transistor and a first upper storage electrode overlapping the first lower storage electrode. The second pixel circuit includes a second driving transistor and a second storage capacitor including a second lower storage electrode connected to a gate of the second driving transistor and a second upper storage electrode overlapping the second lower storage electrode. A second overlapping area of the second lower storage electrode and the second upper storage electrode is about twice to about four times a first overlapping area of the first lower storage electrode and the first upper storage electrode.Type: ApplicationFiled: August 19, 2022Publication date: July 20, 2023Inventors: Kyongjun Kim, Yongbin Kim, Sohyun Shin, Gunwoo Yang, Dongjin Lee, Heejin Jeon, Hyunyoung Choi
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Publication number: 20230122487Abstract: A pixel circuit may include a light-emitting element, a driving transistor which applies a driving current to the light-emitting element, a storage capacitor connected to a control electrode of the driving transistor, a data voltage-applying transistor which applies a data voltage to the storage capacitor, an emission transistor which connects the driving transistor to the light-emitting element in response to an emission signal, and a bias capacitor disposed between a first electrode of the driving transistor and a control electrode of the emission transistor.Type: ApplicationFiled: July 7, 2022Publication date: April 20, 2023Inventor: GUNWOO YANG
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Publication number: 20230005412Abstract: A gate driver according to an exemplary embodiment of the present inventive concept includes a pull-up-pull-down circuit configured to pull up a gate signal to a high level of a first clock signal in a first duration and configured to pull down the gate signal to a low level of the first clock signal in a second duration, and a pull-down boosting circuit configured to output a first off voltage to the pull-up-pull-down part in the second duration in response to a second clock signal.Type: ApplicationFiled: September 12, 2022Publication date: January 5, 2023Inventors: CHOLHO KIM, GUNWOO YANG, HYUNYOUNG CHOI, JIHOON YANG, YONGWOO LEE
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Patent number: 11468843Abstract: A light emitting display device includes: a first switch connected between a data line and a first node and including a gate connected to a first scan line; a second switch connected between a first driving power line and a second node and including a gate electrode connected to the first node; a first capacitor connected between the first node and the second node; a light emitting element connected between the second node and a second driving power line; a scan driver applying a first A-scan signal and a first B-scan signal during different times to the first scan line; a data driver applying a first initialization signal and a data signal to the data line at different times; and a power supply portion applying a first driving voltage, a second driving voltage, and a third driving voltage to the first driving power line at different times.Type: GrantFiled: November 12, 2019Date of Patent: October 11, 2022Assignee: Samsung Display Co., Ltd.Inventors: Wonjun Lee, Gichang Lee, Cholho Kim, Gunwoo Yang
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Patent number: 11443681Abstract: A gate driver according to an exemplary embodiment of the present inventive concept includes a pull-up-pull-down circuit configured to pull up a gate signal to a high level of a first clock signal in a first duration and configured to pull down the gate signal to a low level of the first clock signal in a second duration, and a pull-down boosting circuit configured to output a first off voltage to the pull-up-pull-down part in the second duration in response to a second clock signal.Type: GrantFiled: January 23, 2017Date of Patent: September 13, 2022Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Cholho Kim, Gunwoo Yang, Hyunyoung Choi, Jihoon Yang, Yongwoo Lee
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Patent number: 11282421Abstract: A method of detecting a pixel defect for detecting a defect of a pixel including first to fourth transistors, connected to a data line, and receiving a scan signal and an initialization control signal includes turning on the first through fourth transistors by changing the scan signal and the initialization control signal to have a turn-on voltage level in an inspection period, detecting an inspecting current flowing in a path corresponding to the first through fourth transistors using a current detector that is connected to the data line, determining that a threshold voltage of the second transistor is within a normal range when the inspecting current is within a reference range, and determining that the threshold voltage of the second transistor is out of the normal range when the inspecting current is out of the reference range.Type: GrantFiled: March 13, 2020Date of Patent: March 22, 2022Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Gunwoo Yang, Yongbin Kim, Hyun Young Choi
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Publication number: 20200402432Abstract: A method of detecting a pixel defect for detecting a defect of a pixel including first to fourth transistors, connected to a data line, and receiving a scan signal and an initialization control signal includes turning on the first through fourth transistors by changing the scan signal and the initialization control signal to have a turn-on voltage level in an inspection period, detecting an inspecting current flowing in a path corresponding to the first through fourth transistors using a current detector that is connected to the data line, determining that a threshold voltage of the second transistor is within a normal range when the inspecting current is within a reference range, and determining that the threshold voltage of the second transistor is out of the normal range when the inspecting current is out of the reference range.Type: ApplicationFiled: March 13, 2020Publication date: December 24, 2020Inventors: GUNWOO YANG, YONGBIN KIM, HYUN YOUNG CHOI
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Patent number: 10656491Abstract: A liquid-crystal display including: a gate line extending in a first direction; a gate electrode protruding from the gate line; a gate insulating layer arranged on the gate electrode; an active layer arranged on the gate insulating layer while being insulated from the gate electrode; a data line arranged on the active layer and extending in a second direction; a source electrode protruding from the data line, having a portion overlapping the gate electrode on a plane, and including a plurality of source electrode branches that are separate from each other; a drain electrode being separate from the source electrode, and including a plurality of drain electrode branches, each being arranged between two of the plurality of source electrode branches, and a drain electrode connecting part connecting the plurality of drain electrode branches; a pixel electrode defining a pixel region; a liquid-crystal layer arranged on the pixel electrode.Type: GrantFiled: July 5, 2017Date of Patent: May 19, 2020Assignee: Samsung Display Co., Ltd.Inventors: Gichang Lee, Yongjo Kim, Cholho Kim, Gunwoo Yang, Jihoon Yang, Yongwoo Lee
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Patent number: 10607547Abstract: A display apparatus includes a voltage generator which generates an initial controlling signal which comprises a high voltage, a middle voltage and a low voltage, where the initial controlling signal swings from the middle voltage to the low voltage after a plurality of gate signals is simultaneously dropped from a high voltage to a low voltage thereof.Type: GrantFiled: November 30, 2018Date of Patent: March 31, 2020Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Gunwoo Yang, Cholho Kim, Wonjun Lee
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Publication number: 20200082764Abstract: A light emitting display device includes: a first switch connected between a data line and a first node and including a gate connected to a first scan line; a second switch connected between a first driving power line and a second node and including a gate electrode connected to the first node; a first capacitor connected between the first node and the second node; a light emitting element connected between the second node and a second driving power line; a scan driver applying a first A-scan signal and a first B-scan signal during different times to the first scan line; a data driver applying a first initialization signal and a data signal to the data line at different times; and a power supply portion applying a first driving voltage, a second driving voltage, and a third driving voltage to the first driving power line at different times.Type: ApplicationFiled: November 12, 2019Publication date: March 12, 2020Inventors: Wonjun Lee, Gichang Lee, Cholho Kim, Gunwoo Yang
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Patent number: 10482823Abstract: A light emitting display device includes: a first switch connected between a data line and a first node and including a gate connected to a first scan line; a second switch connected between a first driving power line and a second node and including a gate electrode connected to the first node; a first capacitor connected between the first node and the second node; a light emitting element connected between the second node and a second driving power line; a scan driver applying a first A-scan signal and a first B-scan signal during different times to the first scan line; a data driver applying a first initialization signal and a data signal to the data line at different times; and a power supply portion applying a first driving voltage, a second driving voltage, and a third driving voltage to the first driving power line at different times.Type: GrantFiled: December 22, 2017Date of Patent: November 19, 2019Assignee: Samsung Display Co., Ltd.Inventors: Wonjun Lee, Gichang Lee, Cholho Kim, Gunwoo Yang
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Publication number: 20190172396Abstract: A display apparatus includes a voltage generator which generates an initial controlling signal which comprises a high voltage, a middle voltage and a low voltage, where the initial controlling signal swings from the middle voltage to the low voltage after a plurality of gate signals is simultaneously dropped from a high voltage to a low voltage thereof.Type: ApplicationFiled: November 30, 2018Publication date: June 6, 2019Inventors: Gunwoo YANG, Cholho KIM, Wonjun LEE
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Patent number: 10255845Abstract: An N-th stage of a gate driver includes a first control circuit, a gate signal generating circuit, a carry signal generating circuit, a second control circuit, a third control circuit, and a holding circuit. The first control circuit controls a first signal in response to a first input signal. The gate signal generating circuit generates a gate signal in response to a clock signal and the first signal. The carry signal generating circuit generates a carry signal in response to the clock signal and the first signal. The second control circuit controls the first signal in response to a second input signal. The third control circuit generates a hold control signal in response to a third input signal having a frequency lower than the clock signal's. The holding circuit maintains levels of the first signal, the gate signal, and the carry signal in response to the hold control signal.Type: GrantFiled: March 2, 2017Date of Patent: April 9, 2019Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Cholho Kim, Gunwoo Yang, Jihoon Yang, Yongwoo Lee, Hyunyoung Choi
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Publication number: 20180182301Abstract: A light emitting display device includes: a first switch connected between a data line and a first node and including a gate connected to a first scan line; a second switch connected between a first driving power line and a second node and including a gate electrode connected to the first node; a first capacitor connected between the first node and the second node; a light emitting element connected between the second node and a second driving power line; a scan driver applying a first A-scan signal and a first B-scan signal during different times to the first scan line; a data driver applying a first initialization signal and a data signal to the data line at different times; and a power supply portion applying a first driving voltage, a second driving voltage, and a third driving voltage to the first driving power line at different times.Type: ApplicationFiled: December 22, 2017Publication date: June 28, 2018Inventors: Wonjun Lee, Gichang Lee, Cholho Kim, Gunwoo Yang
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Patent number: 9952475Abstract: A liquid crystal display which enhances an aperture ratio and stabilizes a storage voltage includes a first substrate, a second substrate opposing the first substrate, a liquid crystal layer between the first substrate and the second substrate, a gate line, a data line, a first sub-pixel electrode, and a second sub-pixel electrode on the first substrate, a first transistor connected to the gate line, the data line, and the first sub-pixel electrode, and a second transistor connected to the gate line, the data line, and the second sub-pixel electrode and including a source electrode, a drain electrode and at least one floating electrode between the source electrode and the drain electrode.Type: GrantFiled: March 17, 2016Date of Patent: April 24, 2018Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Keunwoo Kim, Gunwoo Yang
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Publication number: 20180011357Abstract: A liquid-crystal display including: a gate line extending in a first direction; a gate electrode protruding from the gate line; a gate insulating layer arranged on the gate electrode; an active layer arranged on the gate insulating layer while being insulated from the gate electrode; a data line arranged on the active layer and extending in a second direction; a source electrode protruding from the data line, having a portion overlapping the gate electrode on a plane, and including a plurality of source electrode branches that are separate from each other; a drain electrode being separate from the source electrode, and including a plurality of drain electrode branches, each being arranged between two of the plurality of source electrode branches, and a drain electrode connecting part connecting the plurality of drain electrode branches; a pixel electrode defining a pixel region; a liquid-crystal layer arranged on the pixel electrode.Type: ApplicationFiled: July 5, 2017Publication date: January 11, 2018Inventors: Gichang Lee, Yongjo Kim, Cholho Kim, Gunwoo Yang, Jihoon Yang, Yongwoo Lee
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Publication number: 20170263177Abstract: An N-th stage of a gate driver includes a first control circuit, a gate signal generating circuit, a carry signal generating circuit, a second control circuit, a third control circuit, and a holding circuit. The first control circuit controls a first signal in response to a first input signal. The gate signal generating circuit generates a gate signal in response to a clock signal and the first signal. The carry signal generating circuit generates a carry signal in response to the clock signal and the first signal. The second control circuit controls the first signal in response to a second input signal. The third control circuit generates a hold control signal in response to a third input signal having a frequency lower than the clock signal's. The holding circuit maintains levels of the first signal, the gate signal, and the carry signal in response to the hold control signal.Type: ApplicationFiled: March 2, 2017Publication date: September 14, 2017Inventors: CHOLHO KIM, GUNWOO YANG, JIHOON YANG, YONGWOO LEE, HYUNYOUNG CHOI
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Publication number: 20170249893Abstract: A gate driver according to an exemplary embodiment of the present inventive concept includes a pull-up-pull-down circuit configured to pull up a gate signal to a high level of a first clock signal in a first duration and configured to pull down the gate signal to a low level of the first clock signal in a second duration, and a pull-down boosting circuit configured to output a first off voltage to the pull-up-pull-down part in the second duration in response to a second clock signal.Type: ApplicationFiled: January 23, 2017Publication date: August 31, 2017Inventors: CHOLHO KIM, GUNWOO YANG, HYUNYOUNG CHOI, JIHOON YANG, YONGWOO LEE