Patents by Inventor Byong Young Choi
Byong Young Choi 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: 20240087538Abstract: A display device according to an exemplary embodiment of the present disclosure includes a light emitting diode and a pixel driving circuit which drives the light emitting diode, the pixel driving circuit includes a driving transistor which applies a driving current to the light emitting diode, a first transistor which applies a first reference voltage to a gate electrode of the driving transistor, a second transistor which applies a data voltage to the gate electrode of the driving transistor, a third transistor which applies a second reference voltage to a source electrode of the driving transistor, and a storage capacitor connected to the gate electrode and the source electrode of the driving transistor. According to the present disclosure, the threshold voltage Vth and the mobility of the driving transistors are internally compensated to improve an image quality.Type: ApplicationFiled: September 6, 2023Publication date: March 14, 2024Applicants: LG Display Co., Ltd., Industry-University Cooperation Foundation Hanyang UniversityInventors: Harkjin KIM, Kwanghwan JI, Byong-Deok CHOI, Bum Sik KIM, Dong Young KIM, Yong Duck KIM, June Hee LEE
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Patent number: 10077690Abstract: A multiple variable valve lift apparatus may include a moving cam formed in a hollow cylindrical shape into which a camshaft is inserted. In particular, the moving cam rotates together with the camshaft, moves in an axial direction of the camshaft, and includes a cam guide protrusion and a plurality of cams realizing different valve lift with each other. Moreover, the apparatus includes: an operating unit selectively guiding the cam guide protrusion; a controller controlling the operating unit; a valve opening/closing unit contacting with any one cam of the cams; and at least two pins disposed at the operating unit so as to guide the cam guide protrusion. The cam guide protrusion includes an inserted portion being selectively inserted between the pins and a shift portion.Type: GrantFiled: August 26, 2016Date of Patent: September 18, 2018Assignee: HYUNDAI MOTOR COMPANYInventor: Byong Young Choi
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Patent number: 9945273Abstract: A multiple variable valve lift apparatus includes a first moving cam, the first moving cam provided to rotate together with the camshaft and move in an axial direction of the camshaft, a plurality of cams realizing different valve lifts relative to each other, a second moving cam provided to rotate together with the camshaft and move in an axial direction of the camshaft, and forming a second cam guide protrusion and a plurality of cams realizing different valve lifts relative to each other, a first operating unit, a second operating unit, a controller, and a valve opening/closing unit, wherein at least two pins are respectively disposed at the first operating unit and the second operating unit so as to guide the first cam guide protrusion and the second cam guide protrusion, and an interference preventing pin formed to have a relatively large diameter in comparison with the other pin.Type: GrantFiled: August 23, 2016Date of Patent: April 17, 2018Assignee: HYUNDAI MOTOR COMPANYInventor: Byong Young Choi
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Patent number: 9869253Abstract: A multiple variable valve lift apparatus may include a first moving cam provided to rotate together with a camshaft and move in an axial direction of the camshaft, and configured to form a first cam guide protrusion and a plurality of cams realizing different valve lifts from each other, a second moving cam provided to rotate together with a second camshaft and move in an axial direction of the second camshaft, and configured to form a second cam guide protrusion and a plurality of cams realizing different valve lifts from each other, a first operating device operated to move the first moving cam in a first direction, a second operating device operated to move the second moving cam in a second direction, a controller configured to control operations of the first operating device and the second operating device, and a valve opening/closing device.Type: GrantFiled: May 17, 2016Date of Patent: January 16, 2018Assignee: Hyundai Motor CompanyInventors: Byong Young Choi, Seung Kook Han, Soo Hyung Woo, Wootae Kim
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Patent number: 9845737Abstract: An engine system includes main exhaust ports fluidly communicating with each combustion chamber. An exhaust variable valve lift apparatus controls an operation of a main exhaust valve which closes or opens each main exhaust port. A main exhaust manifold is connected with the main exhaust ports. Scavenge exhaust ports fluidly communicate with each combustion chamber. A variable scavenge apparatus controls an operation of a scavenge valve which closes and opens each scavenge exhaust port. A scavenge manifold is connected with the scavenge exhaust ports. A controller is configured to control operations of the exhaust variable valve lift apparatus and the variable scavenge apparatus according to a vehicle operation state.Type: GrantFiled: November 12, 2015Date of Patent: December 19, 2017Assignee: HYUNDAI MOTOR COMPANYInventor: Byong Young Choi
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Patent number: 9816406Abstract: A multiple variable valve lift apparatus may include a camshaft rotating by driving of an engine, a cam portion formed in a cylindrical shape having a hollow that the camshaft is inserted into, rotating together with the camshaft, configured to move along an axial direction of the camshaft, and forming a zero cam and a normal cam, a valve opening/closing device configured to be operated by at least one of the zero cam or the normal cam which are formed at the cam portion, an operating device disposed on an exterior circumference of the camshaft so as to move together with the cam portion, and a solenoid configured to selectively move the operating device along an axial direction of the camshaft, in which a journal, which has a radius being equal to a radius of the zero cam, is formed at the cam portion.Type: GrantFiled: September 25, 2015Date of Patent: November 14, 2017Assignee: Hyundai Motor CompanyInventor: Byong Young Choi
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Patent number: 9784177Abstract: An engine system may include main exhaust ports fluidly communicated with each combustion chamber, main exhaust valves opening and closing each main exhaust port, a main exhaust manifold connected with the main exhaust ports, scavenge exhaust ports fluidly communicated with the each combustion chamber, scavenge valves opening and closing the each scavenge exhaust port, a scavenge manifold connected with the scavenge exhaust ports, in which at least a part of an exhaust gas passing through the scavenge manifold is re-circulated to the combustion chamber to be burned.Type: GrantFiled: July 28, 2015Date of Patent: October 10, 2017Assignee: Hyundai Motor CampanyInventors: Byong Young Choi, Soo Hyung Woo, Seung Kook Han, Byeong Seok Lee, Wootae Kim
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Patent number: 9732679Abstract: An engine that can implement cylinder deactivation (CDA) includes: a plurality of cylinders; a variable valve duration apparatus that is mounted in at least one of the plurality of cylinders and that performs a long duration mode and a short duration mode of an intake valve of a corresponding cylinder; a CDA apparatus that is mounted in at least another one of the plurality of cylinders and that performs a general operation mode and a CDA mode of an intake valve and an exhaust valve of a corresponding cylinder; and a controller that controls operation of the variable valve duration apparatus and the CDA apparatus according to an operation state of an engine, wherein the controller controls the variable valve duration apparatus to operate in a short duration mode, when the CDA apparatus operates in the CDA mode.Type: GrantFiled: December 3, 2014Date of Patent: August 15, 2017Assignee: HYUNDAI MOTOR COMPANYInventor: Byong Young Choi
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Publication number: 20170152772Abstract: A multiple variable valve lift apparatus may include a first moving cam provided to rotate together with a camshaft and move in an axial direction of the camshaft, and configured to form a first cam guide protrusion and a plurality of cams realizing different valve lifts from each other, a second moving cam provided to rotate together with a second camshaft and move in an axial direction of the second camshaft, and configured to form a second cam guide protrusion and a plurality of cams realizing different valve lifts from each other, a first operating device operated to move the first moving cam in a first direction, a second operating device operated to move the second moving cam in a second direction, a controller configured to control operations of the first operating device and the second operating device, and a valve opening/closing device.Type: ApplicationFiled: May 17, 2016Publication date: June 1, 2017Applicant: Hyundai Motor CompanyInventors: Byong Young CHOI, Seung Kook HAN, Soo Hyung WOO, Wootae KIM
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Publication number: 20170152773Abstract: A multiple variable valve lift apparatus includes a first moving cam, the first moving cam provided to rotate together with the camshaft and move in an axial direction of the camshaft, a plurality of cams realizing different valve lifts relative to each other, a second moving cam provided to rotate together with the camshaft and move in an axial direction of the camshaft, and forming a second cam guide protrusion and a plurality of cams realizing different valve lifts relative to each other, a first operating unit, a second operating unit, a controller, and a valve opening/closing unit, wherein at least two pins are respectively disposed at the first operating unit and the second operating unit so as to guide the first cam guide protrusion and the second cam guide protrusion, and an interference preventing pin formed to have a relatively large diameter in comparison with the other pin.Type: ApplicationFiled: August 23, 2016Publication date: June 1, 2017Inventor: Byong Young CHOI
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Publication number: 20170152770Abstract: A multiple variable valve lift apparatus may include a moving cam formed in a hollow cylindrical shape into which a camshaft is inserted. In particular, the moving cam rotates together with the camshaft, moves in an axial direction of the camshaft, and includes a cam guide protrusion and a plurality of cams realizing different valve lift with each other. Moreover, the apparatus includes: an operating unit selectively guiding the cam guide protrusion; a controller controlling the operating unit; a valve opening/closing unit contacting with any one cam of the cams; and at least two pins disposed at the operating unit so as to guide the cam guide protrusion. The cam guide protrusion includes an inserted portion being selectively inserted between the pins and a shift portion.Type: ApplicationFiled: August 26, 2016Publication date: June 1, 2017Applicant: HYUNDAI MOTOR COMPANYInventor: Byong Young CHOI
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Publication number: 20160369709Abstract: An engine system includes main exhaust ports fluidly communicating with each combustion chamber. An exhaust variable valve lift apparatus controls an operation of a main exhaust valve which closes or opens each main exhaust port. A main exhaust manifold is connected with the main exhaust ports. Scavenge exhaust ports fluidly communicate with each combustion chamber. A variable scavenge apparatus controls an operation of a scavenge valve which closes and opens each scavenge exhaust port. A scavenge manifold is connected with the scavenge exhaust ports. A controller is configured to control operations of the exhaust variable valve lift apparatus and the variable scavenge apparatus according to a vehicle operation state.Type: ApplicationFiled: November 12, 2015Publication date: December 22, 2016Inventor: Byong Young CHOI
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Publication number: 20160363011Abstract: A multiple variable valve lift apparatus may include a camshaft rotating by driving of an engine, a cam portion formed in a cylindrical shape having a hollow that the camshaft is inserted into, rotating together with the camshaft, configured to move along an axial direction of the camshaft, and forming a zero cam and a normal cam, a valve opening/closing device configured to be operated by at least one of the zero cam or the normal cam which are formed at the cam portion, an operating device disposed on an exterior circumference of the camshaft so as to move together with the cam portion, and a solenoid configured to selectively move the operating device along an axial direction of the camshaft, in which a journal, which has a radius being equal to a radius of the zero cam, is formed at the cam portion.Type: ApplicationFiled: September 25, 2015Publication date: December 15, 2016Applicant: Hyundai Motor CompanyInventor: Byong Young CHOI
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Patent number: 9476331Abstract: A control apparatus of an engine may include a variable valve lift apparatus, an engine including a plurality of cylinders generating power by combustion of fuel, at least one intake valve and at least one exhaust valve for opening and closing the cylinder, a variable valve lift apparatus adjusting a valve lift of the intake valve and exhaust valve, and a controller driving the intake valve in a low lift mode by using the variable valve lift apparatus and closing the exhaust valve when one of the cylinders among the plurality of cylinders may be deactivated.Type: GrantFiled: July 25, 2014Date of Patent: October 25, 2016Assignee: Hyundai Motor CompanyInventor: Byong Young Choi
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Publication number: 20160108860Abstract: An engine system may include main exhaust ports fluidly communicated with each combustion chamber, main exhaust valves opening and closing each main exhaust port, a main exhaust manifold connected with the main exhaust ports, scavenge exhaust ports fluidly communicated with the each combustion chamber, scavenge valves opening and closing the each scavenge exhaust port, a scavenge manifold connected with the scavenge exhaust ports, in which at least a part of an exhaust gas passing through the scavenge manifold is re-circulated to the combustion chamber to be burned.Type: ApplicationFiled: July 28, 2015Publication date: April 21, 2016Applicant: Hyundai Motor CampanyInventors: Byong Young Choi, Soo Hyung Woo, Seung Kook Han, Byeong Seok Lee, Wootae Kim
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Publication number: 20160090921Abstract: An engine that can implement cylinder deactivation (CDA) includes: a plurality of cylinders; a variable valve duration apparatus that is mounted in at least one of the plurality of cylinders and that performs a long duration mode and a short duration mode of an intake valve of a corresponding cylinder; a CDA apparatus that is mounted in at least another one of the plurality of cylinders and that performs a general operation mode and a CDA mode of an intake valve and an exhaust valve of a corresponding cylinder; and a controller that controls operation of the variable valve duration apparatus and the CDA apparatus according to an operation state of an engine, wherein the controller controls the variable valve duration apparatus to operate in a short duration mode, when the CDA apparatus operates in the CDA mode.Type: ApplicationFiled: December 3, 2014Publication date: March 31, 2016Applicant: HYUNDAI MOTOR COMPANYInventor: Byong Young CHOI
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Patent number: 9267402Abstract: A multistage variable valve lift apparatus includes: a camshaft; a plurality of cams slidably provided on the camshaft and each including a cam base with a guide projection and a cam lobe; a solenoid unit that includes an operating rod with a guide slot into which the guide projection is selectively inserted; and a valve opening/closing portion that comes into selective contact any one of the plurality of cams.Type: GrantFiled: December 30, 2013Date of Patent: February 23, 2016Assignee: Hyundai Motor CompanyInventors: Soo Hyung Woo, Jong Hyeok Choi, Young Hong Kwak, Byong Young Choi, Jin Kook Kong, Gee Wook Shin
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Publication number: 20150345342Abstract: A short duration cam of a variable valve lift apparatus has a cam lift acceleration including a first peak formed before a center of the cam lift acceleration, and a second peak formed after the center of the cam lift acceleration. A relative ratio of a smaller value to a greater value of the first peak and the second peak is 0.8 or more.Type: ApplicationFiled: November 24, 2014Publication date: December 3, 2015Inventors: Byong Young CHOI, Soo Hyung Woo, Ju Hun Lee, Jin Wook Son, Seung Kook Han
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Patent number: 9140147Abstract: A multiple variable valve lift apparatus has a simple design that efficiently operates without interference. The apparatus according may include: a camshaft formed in a hollow cylinder shape; a control shaft disposed in the hollow of the camshaft; a cam that rotates together with the camshaft; a cam rod connecting the control shaft with the cam to move together; an operating unit disposed on the exterior circumference of the camshaft to rotate together with the camshaft; an operating unit rod connecting the control shaft with the operating unit such that the control shaft and the operating unit move together; a solenoid selectively connected with the operating unit, and moving the operating unit along an axial direction of the camshaft; and a tappet contacting the cam to transform rotational motion of the cam to rectilinear motion of a valve.Type: GrantFiled: December 31, 2013Date of Patent: September 22, 2015Assignee: HYUNDAI MOTOR COMPANYInventors: Soo Hyung Woo, Jei Choon Yang, Young Hong Kwak, Byong Young Choi, Jin Kook Kong, Gee Wook Shin
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Patent number: 9115652Abstract: An oil control valve includes a housing having a control port and a drain port, a first seat with a first penetration hole forming a first chamber, a second seat with a second penetration hole forming a second chamber communicated with the control port, the second seat with the housing forming a third chamber communicating with the drain port, a first check valve within the first chamber selectively closing the first penetration hole, a second check valve within the third chamber selectively closing the second penetration hole, and a third penetration hole, a control portion selectively opening the first check valve and simultaneously closing the second check valve or selectively closing the first check valve and simultaneously opening the second check valve and an orifice connecting the first chamber with the second chamber.Type: GrantFiled: December 6, 2011Date of Patent: August 25, 2015Assignees: HYUNDAI MOTOR COMPANY, UNICK CORPORATIONInventors: Byong Young Choi, Young Hong Kwak, Gee Wook Shin, Jin Kook Kong, Soo Hyung Woo, Chang-Hoon Lee