Patents by Inventor Seungheun SONG
Seungheun SONG 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: 11942148Abstract: Crossbar arrays perform analog vector-matrix multiplication naturally and provide a building block for modern computing systems. Specialized mixed-signal interface circuits are interfaced with the rows and columns of the crossbar arrays. During operation, the mixed-signal interface circuits provide high voltages for write operations and low voltages for read operations. This disclosure presents improved designs for the mixed-signal interface circuits which minimize the number of switches as well as the number level shifters.Type: GrantFiled: April 22, 2022Date of Patent: March 26, 2024Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Michael Flynn, Seungjong Lee, Seungheun Song, Justin Correll
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Publication number: 20240030927Abstract: A phase locked loop (PLL) includes a phase detector configured to receive a reference signal and a feedback signal, wherein the reference signal has a reference frequency, sample the feedback signal, and output a phase detection signal indicative of a phase of the feedback signal. A voltage controlled oscillator is configured to generate an output signal based on the phase detection signal. The output signal has an output frequency greater than the reference frequency.Type: ApplicationFiled: July 19, 2023Publication date: January 25, 2024Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Matthew R. BELZ, Lu JIE, Seungheun SONG, Michael P. FLYNN
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Patent number: 11500192Abstract: The present invention relates to a lens curvature variation apparatus. The lens curvature variation apparatus according to an embodiment is a lens curvature variation apparatus for varying a curvature of a liquid lens which is variable based on an applied electrical signal. The lens curvature variation apparatus includes a lens driver to apply the electrical signal to the liquid lens, a sensor unit to sense the curvature of the liquid lens formed based on the electrical signal, and a controller to control the lens driver to form a target curvature of the liquid lens based on the sensed curvature, wherein the lens driver supplies the electrical signal to the liquid lens according to a switching operation of a switching element, and includes a detection element connected to one end of the switching element, wherein the sensor unit senses an electrical signal detected by the detection element. Thereby, the curvature of the lens can be sensed quickly and accurately.Type: GrantFiled: July 20, 2018Date of Patent: November 15, 2022Assignee: LG INNOTEK CO., LTD.Inventors: Seungheun Song, Sungoh Yang
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Publication number: 20220342635Abstract: Crossbar arrays perform analog vector-matrix multiplication naturally and provide a building block for modern computing systems. In many applications, the weights stored in the crossbar array are learned off-line and then stored on embedded devices. After the weights are learned, they do not change. Since the weights do not change in these applications, this disclosure envisions a new implementation for the processing elements of the crossbar array.Type: ApplicationFiled: April 22, 2022Publication date: October 27, 2022Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Michael FLYNN, Seungheun SONG, Justin CORRELL
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Publication number: 20220343976Abstract: Crossbar arrays perform analog vector-matrix multiplication naturally and provide a building block for modern computing systems. Specialized mixed-signal interface circuits are interfaced with the rows and columns of the crossbar arrays. During operation, the mixed-signal interface circuits provide high voltages for write operations and low voltages for read operations. This disclosure presents improved designs for the mixed-signal interface circuits which minimize the number of switches as well as the number level shifters.Type: ApplicationFiled: April 22, 2022Publication date: October 27, 2022Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Michael FLYNN, Seungjong LEE, Seungheun SONG, Justin CORRELL
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Patent number: 11378795Abstract: The present invention relates to a lens curvature variation apparatus. The lens curvature variation apparatus according to an embodiment is a lens curvature varying apparatus for varying a curvature of a liquid lens having a variable curvature based on an applied electric signal, the lens curvature varying apparatus comprising: And a control unit for controlling the lens driving unit to form a target curvature of the liquid lens on the basis of the sensed curvature, The sensor unit senses a change in the size or the area of the boundary area between the insulator on the electrode in the liquid lens and the electroconductive aqueous solution. Thereby, the curvature of the lens can be sensed quickly and accurately.Type: GrantFiled: July 20, 2018Date of Patent: July 5, 2022Assignees: LG INNOTEK CO., LTD., CORNING INCORPORATEDInventors: Seungheun Song, Sungoh Yang
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Patent number: 11181670Abstract: The present invention relates to a lens curvature variation apparatus using sensed temperature information. The lens curvature variation apparatus according to an embodiment is a lens curvature variation apparatus for varying a curvature of a liquid lens which is variable based on an applied electrical signal and includes a lens driver to apply an electrical signal to the liquid lens, a sensor unit to sense the curvature of the liquid lens formed based on the electrical signal, a temperature sensing unit to sense a temperature of a periphery of the liquid lens, and a controller to control the lens driver to form a target curvature of the liquid lens based on the sensed curvature, wherein the controller controls the lens driver to output a changed electrical signal to the liquid lens to form the target curvature, based on the sensed temperature. Thereby, the curvature of the lens can be sensed quickly and accurately using the sensed temperature information.Type: GrantFiled: July 20, 2018Date of Patent: November 23, 2021Assignees: LG INNOTEK CO., LTD., CORNING INCORPORATEDInventors: Seungheun Song, Jaehoon Jeong, Yelim Youn, Jongyeon Lee
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Publication number: 20210048661Abstract: The present invention relates to a lens curvature variation apparatus. The lens curvature variation apparatus according to an embodiment is a lens curvature variation apparatus for varying a curvature of a liquid lens which is variable based on an applied electrical signal. The lens curvature variation apparatus includes a lens driver to apply the electrical signal to the liquid lens, a sensor unit to sense the curvature of the liquid lens formed based on the electrical signal, and a controller to control the lens driver to form a target curvature of the liquid lens based on the sensed curvature, wherein the lens driver supplies the electrical signal to the liquid lens according to a switching operation of a switching element, and includes a detection element connected to one end of the switching element, wherein the sensor unit senses an electrical signal detected by the detection element. Thereby, the curvature of the lens can be sensed quickly and accurately.Type: ApplicationFiled: July 20, 2018Publication date: February 18, 2021Inventors: Seungheun SONG, Sungoh YANG
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Publication number: 20200386983Abstract: The present invention relates to a lens curvature variation apparatus. The lens curvature variation apparatus according to an embodiment is a lens curvature varying apparatus for varying a curvature of a liquid lens having a variable curvature based on an applied electric signal, the lens curvature varying apparatus comprising: And a control unit for controlling the lens driving unit to form a target curvature of the liquid lens on the basis of the sensed curvature, The sensor unit senses a change in the size or the area of the boundary area between the insulator on the electrode in the liquid lens and the electroconductive aqueous solution. Thereby, the curvature of the lens can be sensed quickly and accurately.Type: ApplicationFiled: July 20, 2018Publication date: December 10, 2020Inventors: Seungheun SONG, Sungoh YANG
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Publication number: 20200319381Abstract: The present invention relates to a lens curvature variation apparatus using sensed temperature information. The lens curvature variation apparatus according to an embodiment is a lens curvature variation apparatus for varying a curvature of a liquid lens which is variable based on an applied electrical signal and includes a lens driver to apply an electrical signal to the liquid lens, a sensor unit to sense the curvature of the liquid lens formed based on the electrical signal, a temperature sensing unit to sense a temperature of a periphery of the liquid lens, and a controller to control the lens driver to form a target curvature of the liquid lens based on the sensed curvature, wherein the controller controls the lens driver to output a changed electrical signal to the liquid lens to form the target curvature, based on the sensed temperature. Thereby, the curvature of the lens can be sensed quickly and accurately using the sensed temperature information.Type: ApplicationFiled: July 20, 2018Publication date: October 8, 2020Inventors: Seungheun SONG, Jaehoon JEONG, Yelim YOUN, Jongyeon LEE