Patents by Inventor Hak Rin Kim
Hak Rin Kim 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: 20240027960Abstract: A holographic printing system according to an embodiment of the present disclosure is disclosed. The system may include: a light source; a geometrical phase holographic element having a phase retardation of ?/4; and an optical member for copying and printing a wavefront through self-interference of light transmitted through the geometrical phase holographic element. According to an embodiment, the light source, the geometrical phase holographic element, and the optical member may be disposed in a line. According to an embodiment, the geometrical phase holographic element and the optical member may be disposed with a predetermined distance therebetween, and the predetermined distance may be a distance that enables self-interference of light transmitted through the geometrical phase holographic element.Type: ApplicationFiled: November 23, 2021Publication date: January 25, 2024Applicant: Kyungpook National University Industry-Academic Cooperation FoundationInventors: Hak Rin KIM, Tae Hyun LEE
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Patent number: 11733571Abstract: An active random refraction device includes a random structure having the same refractive index characteristics regardless of polarization direction of light, a liquid crystal polymer on the random structure with refractive index characteristics changing according to polarization direction of the light, a polarization switching device, and a refractive surface with an inclination angle randomly distributed along the horizontal direction perpendicular to the incident direction of the light. The active random refraction device can be switched between a transmission mode and a refractive mode according to the polarization of the light.Type: GrantFiled: March 11, 2022Date of Patent: August 22, 2023Assignee: Kungpook National University Industry-Academic Cooperation FoundationInventors: Hak-Rin Kim, Kyung-Il Joo, Tae-Hyun Lee, Min-Kyu Park
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Publication number: 20230229070Abstract: Disclosed is a polarization-dependent light steering device based wide projection display system which can extend the screen projection region of an image at low cost without lowering of resolution. A wide projection display system according to an embodiment of the present invention comprises: a projector for sequentially outputting, in a time division scheme, images to be projected to different regions on a screen; and a light steering device installed behind the projector to differently control the output directions of the images according to the polarization directions of the images. The light steering device comprises a plurality of Fresnel prism arrays having polarization dependence. The plurality of Fresnel prism arrays are stacked along the projection direction of images output from the projector.Type: ApplicationFiled: November 8, 2019Publication date: July 20, 2023Inventors: Hak-Rin KIM, Min-Kyu PARK
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Patent number: 11656577Abstract: Disclosed are a holographic writing method and apparatus capable of re-writing (updating) holographic information and quickly writing the holographic information with high efficiency. In an embodiment, a holographic writing method for writing holographic information by emitting a beam at a holographic recording medium containing a photo-responsable polymer material having photoisomerization characteristics that change a molecular structure thereof by absorbing light energy, writes the holographic information by using a writing wavelength different from a maximum absorption wavelength in a light absorption spectrum of photoisomer molecule structures of the holographic recording medium. The maximum absorption wavelength is a wavelength at which light absorption rate is maximum in the light absorption spectrum.Type: GrantFiled: November 8, 2019Date of Patent: May 23, 2023Assignees: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION, KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGYInventors: Hak-Rin Kim, Jae-Won Ka, Mi-Hye Yi, Ae-Jin Yeon, Kyung-Il Joo
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Publication number: 20220283541Abstract: A holographic camera system includes an imaging lens, a polarizer configured to circularly polarize light incident from the imaging lens, a geometric phase lens with a phase delay of ?/4, and an image sensor configured to replicate an interference pattern through self-interference of light output from the geometric phase.Type: ApplicationFiled: March 4, 2022Publication date: September 8, 2022Inventors: Hak-Rin Kim, Tae-Hyun Lee, Ki Hong Choi, Kee Hoon Hong, Joong Ki Park
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Publication number: 20220260953Abstract: Disclosed herein an apparatus for generating hologram and a method for generating hologram using the same. The apparatus includes: a geometric phase modulator disposed to enable incident light from a target object to pass through and configured to modulate the incident light to a plurality of circular polarizations; an image sensor configured to receive the plurality of circular polarizations and to acquire an interference fringe generated by the plurality of circular polarizations as an image; and a polarization selective element equipped with a liquid crystal element, which controls an output polarization angle of the incident light according to an output polarization signal, and configured to sequentially output the incident light at output polarization angles different from each other.Type: ApplicationFiled: February 17, 2022Publication date: August 18, 2022Applicants: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Kyungpook National University Industry-Academic Cooperation FoundationInventors: Ki Hong CHOI, Joong Ki PARK, Kee Hoon HONG, Hak-Rin KIM, Su-Won LEE, Tae-Hyun LEE
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Publication number: 20220197077Abstract: An active random refraction device includes a random structure having the same refractive index characteristics regardless of polarization direction of light, a liquid crystal polymer on the random structure with refractive index characteristics changing according to polarization direction of the light, a polarization switching device, and a refractive surface with an inclination angle randomly distributed along the horizontal direction perpendicular to the incident direction of the light. The active random refraction device can be switched between a transmission mode and a refractive mode according to the polarization of the light.Type: ApplicationFiled: March 11, 2022Publication date: June 23, 2022Inventors: Hak-Rin Kim, Kyung-Il Joo, Tae-Hyun Lee, Min-Kyu Park
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Patent number: 10911669Abstract: A light field imaging system includes a lens configured to collect light transmitted from an object; a polarizer configured to polarize the light; a polarization switching unit configured to repeatedly switch the polarization direction of the light in first and second polarization directions; first and second polarization dependent lens arrays configured to operate as a lens when the polarization direction of the light is the first and second polarization direction, respectively, and having a staggered arrangement; an image sensor configured to obtain a first image from the light collected by the first polarization dependent lens array and obtain a second image from the light collected by the second polarization dependent lens array; and an image processing unit configured to combine the first image and the second image to generate a high resolution image having higher resolution than the first image and the second image.Type: GrantFiled: November 8, 2019Date of Patent: February 2, 2021Assignee: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATIONInventors: Hak-Rin Kim, Min-Kyu Park, Tae-Hyun Lee
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Patent number: 10816870Abstract: An active prism structure includes: an isotropic layer made of a photocurable isotropic polymer having a predetermined refractive index np and stacked on a substrate; and a birefringent layer made of a birefringent material having an ordinary refractive index no and an extraordinary refractive index ne and stacked on the isotropic layer, an interface between the isotropic layer and the birefringent layer is formed in a prism shape, and refractive index differences occurring at the interface between the isotropic layer and the birefringent layer are different according to a polarization direction of incident light. The active prism structure is configured such that the refractive index differences are different according to the polarization direction of the incident light, and thus, it is possible to change a refraction angle and refraction direction of the prism by controlling the polarization direction of the incident light.Type: GrantFiled: February 12, 2018Date of Patent: October 27, 2020Assignee: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATIONInventors: Hak-Rin Kim, Min-Kyu Park
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Patent number: 10762709Abstract: Provided is a an augmented reality providing device including: a sensing unit configured to sense a body part of a user; a display unit configured to display an image; a semi-transparent mirror unit disposed spaced from the display unit and configured to reflect light incident from the user to emit the reflected light to the user, and transmit light incident from the display unit to provide the transmitted light to the user; and a control unit configured to determine a position at which the image is displayed on the display unit based on the sensed body part.Type: GrantFiled: October 5, 2016Date of Patent: September 1, 2020Assignee: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATIONInventors: Soon Ki Jung, Hak-Rin Kim, Gi-Sook Jung, Jae Seok Jang, Min-Kyu Park
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Publication number: 20200201251Abstract: Disclosed are a holographic writing method and apparatus capable of re-writing (updating) holographic information and quickly writing the holographic information with high efficiency. In an embodiment, a holographic writing method for writing holographic information by emitting a beam at a holographic recording medium containing a photo-responsable polymer material having photoisomerization characteristics that change a molecular structure thereof by absorbing light energy, writes the holographic information by using a writing wavelength different from a maximum absorption wavelength in a light absorption spectrum of photoisomer molecule structures of the holographic recording medium. The maximum absorption wavelength is a wavelength at which light absorption rate is maximum in the light absorption spectrum.Type: ApplicationFiled: November 8, 2019Publication date: June 25, 2020Inventors: Hak-Rin KIM, Jae-Won KA, Mi-Hye YI, Ae-Jin YEON, Kyung-Il JOO
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Patent number: 10663772Abstract: Provided is an active lens structure. The active lens structure has a configuration in which a polarization switching section and a polarization dependent lens section are integrally formed, wherein a lattice structure is formed on an upper surface of a liquid crystal phase polymer layer of the polarization dependent lens section, and the liquid crystal phase polymer layer is aligned in a top-down manner and is used as a lower alignment film of a liquid crystal layer. Therefore, the polarization switching section of the active lens structure can be fabricated without any lower alignment film and any lower glass substrate, so that it is possible to minimize the total thickness and simplifying the manufacturing process.Type: GrantFiled: November 17, 2016Date of Patent: May 26, 2020Assignee: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATIONInventors: Hak-Rin Kim, Ji-Sub Park, Min-Kyu Park
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Publication number: 20200154042Abstract: A light field imaging system includes a lens configured to collect light transmitted from an object; a polarizer configured to polarize the light; a polarization switching unit configured to repeatedly switch the polarization direction of the light in first and second polarization directions; first and second polarization dependent lens arrays configured to operate as a lens when the polarization direction of the light is the first and second polarization direction, respectively, and having a staggered arrangement; an image sensor configured to obtain a first image from the light collected by the first polarization dependent lens array and obtain a second image from the light collected by the second polarization dependent lens array; and an image processing unit configured to combine the first image and the second image to generate a high resolution image having higher resolution than the first image and the second image.Type: ApplicationFiled: November 8, 2019Publication date: May 14, 2020Inventors: Hak-Rin KIM, Min-Kyu PARK, Tae-Hyun LEE
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Patent number: 10497487Abstract: In a transparent electrode based on a metal material having reduced light reflectance, a light absorbing layer having black characteristic is formed on a lower surface, a partition wall, and/or an upper surface of a metal wire, and thus, light reflectance of transparent electrode is minimized. In a method of manufacturing a transparent electrode, the light absorbing layer can be selectively formed on the upper and lower surfaces and the partition wall of the metal wire having a fine line width by using self-aligning and a spontaneous pattern effect. A conductive wire is implemented by using an imprinting process using an elastic body-based stamp, and thus, conductive wires having a fine line width and an excellent aspect ratio can be formed, so that it is possible to improve electric conductivity and transmittance.Type: GrantFiled: March 29, 2017Date of Patent: December 3, 2019Assignee: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATIONInventors: Hak-Rin Kim, Ji-Sub Park, Jun-Chan Choi
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Patent number: 10403415Abstract: In a transparent electrode based on a metal material having reduced light reflectance, a light absorbing layer having black characteristic is formed on a lower surface, a partition wall, and/or an upper surface of a metal wire, and thus, light reflectance of transparent electrode is minimized. In a method of manufacturing a transparent electrode, the light absorbing layer can be selectively formed on the upper and lower surfaces and the partition wall of the metal wire having a fine line width by using self-aligning and a spontaneous pattern effect. A conductive wire is implemented by using an imprinting process using an elastic body-based stamp, and thus, conductive wires having a fine line width and an excellent aspect ratio can be formed, so that it is possible to improve electric conductivity and transmittance.Type: GrantFiled: March 29, 2017Date of Patent: September 3, 2019Assignee: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATIONInventors: Hak-Rin Kim, Ji-Sub Park, Jun-Chan Choi
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Publication number: 20190086695Abstract: Provided is an active lens structure. The active lens structure has a configuration in which a polarization switching section and a polarization dependent lens section are integrally formed, wherein a lattice structure is formed on an upper surface of a liquid crystal phase polymer layer of the polarization dependent lens section, and the liquid crystal phase polymer layer is aligned in a top-down manner and is used as a lower alignment film of a liquid crystal layer. Therefore, the polarization switching section of the active lens structure can be fabricated without any lower alignment film and any lower glass substrate, so that it is possible to minimize the total thickness and simplifying the manufacturing process.Type: ApplicationFiled: November 17, 2016Publication date: March 21, 2019Applicant: Kyungpook National University Industry-Academic Cooperation FoundationInventors: Hak-Rin KIM, Ji-Sub PARK, Min-Kyu PARK
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Publication number: 20180330545Abstract: Provided is a an augmented reality providing device including: a sensing unit configured to sense a body part of a user; a display unit configured to display an image; a semi-transparent mirror unit disposed spaced from the display unit and configured to reflect light incident from the user to emit the reflected light to the user, and transmit light incident from the display unit to provide the transmitted light to the user; and a control unit configured to determine a position at which the image is displayed on the display unit based on the sensed body part.Type: ApplicationFiled: October 5, 2016Publication date: November 15, 2018Applicant: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION-FOUNDATIONInventors: Soon Ki JUNG, Hak-Rin KIM, Gi-Sook JUNG, Jae Seok JANG, Min-Kyu PARK
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Publication number: 20180239215Abstract: An active prism structure includes: an isotropic layer made of a photocurable isotropic polymer having a predetermined refractive index np and stacked on a substrate; and a birefringent layer made of a birefringent material having an ordinary refractive index nc and an extraordinary refractive index ne and stacked on the isotropic layer, an interface between the isotropic layer and the birefringent layer is formed in a prism shape, and refractive index differences occurring at the interface between the isotropic layer and the birefringent layer are different according to a polarization direction of incident light. The active prism structure is configured such that the refractive index differences are different according to the polarization direction of the incident light, and thus, it is possible to change a refraction angle and refraction direction of the prism by controlling the polarization direction of the incident light.Type: ApplicationFiled: February 12, 2018Publication date: August 23, 2018Inventors: Hak-Rin KIM, Min-Kyu PARK
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Patent number: 9869806Abstract: An optical device with variable focused beam pattern includes a first lens structure configured by arranging first lenticular lenses which are formed with liquid crystals or liquid crystal polymers having a first extraordinary refractive index axis direction and of which longitudinal axes are aligned with a first alignment direction, and a second lens structure laminated on a beam emitting surface of the first lens structure and configured by arranging second lenticular lenses which are formed with liquid crystals or liquid crystal polymers having a second extraordinary refractive index axis direction and of which longitudinal axes are aligned with a second alignment direction.Type: GrantFiled: October 18, 2013Date of Patent: January 16, 2018Assignee: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATIONInventor: Hak-Rin Kim
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Patent number: 9846266Abstract: Provided is a liquid crystalline polymer film where noise caused by diffraction light is removed. The liquid crystalline polymer film is configured to include a first liquid crystalline polymer film formed by simultaneously performing a bottom-up alignment method by a lower alignment film and a top-down alignment method by using a groove structure and a second liquid crystalline polymer film formed on an upper portion of the first liquid crystalline polymer film by overcoating. The second liquid crystalline polymer film is configured so as to satisfy a refractive index matching condition with respect to the first liquid crystalline polymer film, so that noise caused by undesired diffraction phenomenon generated by the groove structure on the upper surface of the first liquid crystalline polymer film is removed.Type: GrantFiled: November 4, 2014Date of Patent: December 19, 2017Assignee: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATIONInventor: Hak-Rin Kim