Patents by Inventor Dong Hyun Oh

Dong Hyun Oh 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).

  • Patent number: 11262636
    Abstract: A transmittance-variable film having a double-cell structure or a single-cell structure capable of suppressing formation of bubbles inside a liquid crystal layer or at the interface between a base film and a pressure-sensitive adhesive layer under high-temperature and high-humidity reliability conditions is provided. An exemplary transmittance-variable film can be applied to various applications, including various construction or automotive materials that require control of transmittance, or eyewear, such as augmented reality experience or sports goggles, sunglasses or helmets.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: March 1, 2022
    Inventors: Jung Doo Kim, Hyun Jun Lee, Yeon Keun Lee, Joo Hyun Lee, Dong Hyun Oh
  • Patent number: 11226519
    Abstract: A light modulation element and the use thereof are provided. The light modulation element can suppress a surface waviness phenomenon upon surface reflection visual observation by improving surface waviness of a base film caused by a spacer. Such light modulation element can be applied to various flexible display devices to improve the quality of products.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: January 18, 2022
    Inventors: Jung Sun You, Dong Hyun Oh, Nam Gyu Kim, Eun Jung Lim
  • Patent number: 11163197
    Abstract: A substrate having a spacer thereon and an optical device including the same are disclosed herein. In some embodiments, a substrate includes a base layer, a transparent column spacer formed on the base layer, and a black layer present between the transparent column spacer and the base layer. In some embodiments, an alignment film is present on the spacer.
    Type: Grant
    Filed: January 24, 2020
    Date of Patent: November 2, 2021
    Inventors: Nam Seok Bae, Seung Heon Lee, Song Ho Jang, Dong Hyun Oh, Jin Woo Park, Ji Young Hwang, Jung Sun You, Han Min Seo, Cheol Ock Song
  • Patent number: 11142948
    Abstract: Disclosed is an access control apparatus according to the present invention. The access control apparatus includes: a body located on a passage; an opening and closing part coupled to the body and having a folding arm adapted to open and close the passage; and a driving part coupled to the body to control an operation of the opening and closing part, wherein the folding arm includes a first link whose one end is rotatably coupled to the body and a second link whose one end is coupled to the body in such a manner as to be straightly moved by means of the driving part and whose other end is foldably coupled to the other end of the first link.
    Type: Grant
    Filed: June 25, 2018
    Date of Patent: October 12, 2021
    Assignees: CRUCIALTEC CO. LTD, CRUCIALTRAK, INC
    Inventors: Dong Hyun Oh, Yong Hee Han, Dong Ho Lee
  • Publication number: 20210311342
    Abstract: A transmittance-variable device is disclosed herein. In some embodiments, the transmittance-variable device includes a retardation film, a liquid crystal alignment film, and a liquid crystal layer configured to implement a twist orientation mode, wherein the retardation film, the liquid crystal alignment film and the liquid crystal layer are sequentially arranged, wherein a twist angle (T) is in a range of 50 degrees to 180 degrees, and wherein the smallest angle A between a slow axis of the retardation film and an alignment direction of the liquid crystal alignment film satisfies Equation 1 when a product (?nd) of a refractive index anisotropy (?n) and a thickness (d) is 0.7 ?m or less, and satisfies Equation 2 when the product (?nd) is more than 0.7 ?m. The transmittance-variable device can be applied to various applications without causing problems such as a crosstalk phenomenon, a rainbow phenomenon or a mirroring phenomenon.
    Type: Application
    Filed: September 4, 2019
    Publication date: October 7, 2021
    Applicant: LG Chem, Ltd.
    Inventors: Eun Jung Lim, Min Jun Gim, Sergey Belyaev, Dong Hyun Oh
  • Patent number: 11137650
    Abstract: The present application relates to an optical element, a driving method of the optical element, a transmittance-variable device and a use thereof. In one example, the present application may provide a driving method suppressing a back-flow phenomenon caused by a bulk liquid crystal compound even when a cell gap of a liquid crystal layer becomes thick. The driving method may ensure excellent response speeds and driving characteristics.
    Type: Grant
    Filed: September 27, 2018
    Date of Patent: October 5, 2021
    Inventors: Eun Jung Lim, Dong Hyun Oh, Jung Sun You, Jin Hong Kim, Hyun Jun Lee, Nam Hun Kim, Min Jun Gim
  • Patent number: 11099435
    Abstract: A transmittance-variable device is disclosed herein. In some embodiments, a transmittance-variable device includes first and second guest host layers, the first and second guest host layers are superposed, wherein each of the first and second guest host layers comprise a liquid crystal host and a dichroic dye guest, and wherein the device is capable of switching between a transparent mode and a black mode. The transmittance-variable device can exhibit high transmittance in the transparent state and a high shielding rate in the black state, and can exhibit a high contrast ratio even at the inclination angle, and exhibit excellent viewing angle symmetry in all directions. Such a transmittance-variable device can be applied to various applications including various architectural or automotive materials which need to adjust the transmittance, or eyewear such as goggles for augmented reality experience or sports, sunglasses or helmets.
    Type: Grant
    Filed: October 30, 2018
    Date of Patent: August 24, 2021
    Inventors: Eun Jung Lim, Sergey Belyaev, Dong Hyun Oh, Jung Sun You, Jin Hong Kim, Hyun Jun Lee, Min Jun Gim
  • Publication number: 20210240012
    Abstract: A transmittance-variable device is provided in the present application. The present application provides a transmittance-variable device, which can be applied to various applications without causing problems such as a crosstalk phenomenon, a rainbow phenomenon or a mirroring phenomenon, while having excellent transmittance-variable characteristics.
    Type: Application
    Filed: September 4, 2019
    Publication date: August 5, 2021
    Applicant: LG Chem, Ltd.
    Inventors: Eun Jung Lim, Sergey Belyaev, Min Jun Gim, Dong Hyun Oh, Jung Sun You, Nam Gyu Kim, Jin Hong Kim, Hyun Jun Lee
  • Publication number: 20210223595
    Abstract: A light modulation element and the use thereof are provided. The light modulation element can suppress a surface waviness phenomenon upon surface reflection visual observation by improving surface waviness of a base film caused by a spacer. Such light modulation element can be applied to various flexible display devices to improve the quality of products.
    Type: Application
    Filed: July 2, 2019
    Publication date: July 22, 2021
    Applicant: LG Chem, Ltd.
    Inventors: Jung Sun You, Dong Hyun Oh, Nam Gyu Kim, Eun Jung Lim
  • Patent number: 11036093
    Abstract: The present application relates to a method of manufacturing an optical device, an optical device and a use of the optical device. The method of manufacturing an optical device of the present application can form a patterned mold layer to maintain an appropriate gap between the upper and lower substrates, and can apply an imprinting process in patterning the mold layer to simply manufacture the mold pattern having the desired shape. In addition, the optical device manufactured by the above manufacturing method can have a low driving voltage and no short circuit phenomenon, and be realized as a flexible device. Such an optical device can be applied to various display devices such as LCDs.
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: June 15, 2021
    Inventors: Jung Sun You, Sung Joon Min, Dong Hyun Oh, Jin Hong Kim, Jung Woon Kim, Eun Jung Lim
  • Patent number: 11029596
    Abstract: The present application relates to a film mask comprising: a transparent substrate; a darkened light-shielding pattern layer provided on the transparent substrate; and an embossed pattern part provided on a surface of the transparent substrate, which is provided with the darkened light-shielding pattern layer, a method for manufacturing the same, a method for forming a pattern by using the same, and a pattern formed by using the same.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: June 8, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Ji Young Hwang, Han Min Seo, Nam Seok Bae, Seung Heon Lee, Dong Hyun Oh, Jungsun You
  • Publication number: 20210165284
    Abstract: A transmittance-variable device is provided in the present application. The present application can provide a transmittance-variable device, which can be applied to various applications without causing problems such as a crosstalk phenomenon, a rainbow phenomenon or a mirroring phenomenon, while having excellent transmittance-variable characteristics.
    Type: Application
    Filed: September 4, 2019
    Publication date: June 3, 2021
    Applicant: LG Chem, Ltd.
    Inventors: Eun Jung Lim, Sergey Belyaev, Min Jun Gim, Dong Hyun Oh
  • Patent number: 11009725
    Abstract: A light modulation device is disclosed herein. In some embodiments, a light modulation device includes a first polymer film substrate, a second polymer film substrate, an active liquid crystal layer disposed between the first and second polymer film substrates, wherein the active liquid crystal layer is capable of switching between a vertical orientation state and a twisting orientation state upon application of a voltage, each of the first and second polymer film substrates has an in-plane retardation of 4,000 nm or more for light having a wavelength of 550 nm, a ratio of an elongation (E1) in a first direction to an elongation (E2) in a second direction perpendicular to the first direction of 3 or more, and wherein an angle formed by the first directions of the first and second polymer film substrates is in a range of 0 degrees to 10 degrees.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: May 18, 2021
    Inventors: Min Jun Gim, Eun Jung Lim, Jung Sun You, Hyun Jun Lee, In Ju Mun, Dong Hyun Oh, Nam Gyu Kim, Jin Hong Kim, Hyo Jin Lee, Nam Hun Kim
  • Patent number: 11003032
    Abstract: A transmittance-variable device is disclosed herein. In some embodiments, the transmittance-variable device includes a first guest host layer, a second guest host layer, and a phase difference element disposed between the first and second guest host layers, wherein each of the first and second guest host layers comprise a liquid crystal host and a dichroic dye guest, and the liquid crystal hosts are capable of being horizontally oriented such that their optical axes are horizontal to each other. The transmittance-variable device can switch between a clear state and a black state, can exhibit high transmittance in the clear state and a high shielding rate in the black state, and can exhibit a high contrast ratio even at the inclination angle. Such a transmittance-variable device can be used in architectural or automotive materials, or eyewear such as goggles for augmented reality experience or sports, sunglasses or helmets.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: May 11, 2021
    Inventors: Dong Hyun Oh, Eun Jung Lim, Nam Hun Kim
  • Patent number: 10984621
    Abstract: Disclosed is an access control apparatus according to the present invention. The access control apparatus includes: a body located on a passage and having a plurality of support frames; an opening and closing part detachably attached between the plurality of support frames to open and close the passage; and a driving part coupled to the body and the opening and closing part to control an operation of the opening and closing part and having an angle control module for adjusting an opening and closing angle of the opening and closing part and a speed control module for setting an opening and closing speed of the opening and closing part, wherein the driving part controls the opening and closing part so that the opening and closing part is stopped from closing at a given angle through the angle control module.
    Type: Grant
    Filed: June 25, 2018
    Date of Patent: April 20, 2021
    Assignees: CRUCIALTEC CO.LTD, CRUCIALTRAK, INC
    Inventors: Dong Hyun Oh, Yong Hee Han, Dong Ho Lee
  • Patent number: 10969686
    Abstract: The present application relates to a film mask comprising: a transparent substrate; a darkened light-shielding pattern layer provided on the transparent substrate; and groove portions provided in a region where the darkened light-shielding pattern layer is not provided, a method for manufacturing the same, a method for forming a pattern by using the same, and a pattern manufactured by using the same.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: April 6, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Ji Young Hwang, Han Min Seo, Sangcholl Han, Seung Heon Lee, Dong Hyun Oh, Dae Han Seo, Nam Seok Bae, Min Soo Song
  • Patent number: 10969677
    Abstract: The present application relates to a film mask including: a transparent substrate; a darkened light-shielding pattern layer provided on the transparent substrate; and a release force enhancement layer provided on the darkened light-shielding pattern layer and having surface energy of 30 dynes/cm or less, a method for manufacturing the same, and a method for forming a pattern using the film mask.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: April 6, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Ji Young Hwang, Han Min Seo, Nam Seok Bae, Seung Heon Lee, Dong Hyun Oh, Chan Hyoung Park, Ki-Hwan Kim, Ilha Lee
  • Patent number: 10954444
    Abstract: The present application relates to a novel liquid crystal compound and a use thereof. The novel liquid crystal compounds of the present application can exhibit a smectic A phase over a wide temperature range. The novel liquid crystal compounds of the present application can be usefully used in the technical fields to which smectic A liquid crystals can be applied, for example, bistable devices.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: March 23, 2021
    Inventors: Eun Jung Lim, Ki Chul Koo, Dong Hyun Oh
  • Patent number: 10941344
    Abstract: A liquid crystal cell which is capable of switching between a transparent mode and a scattering mode by using a non-ionic compound as a liquid crystal additive for realizing the EHDI characteristics and has excellent performance such as a driving voltage characteristic, a haze characteristic and reliability by securing solubility of the additive for liquid crystals. Such a liquid crystal cell can be applied to various light modulation devices such as a smart window, a window protective film, a flexible display device, a light shielding plate for transparent display, an active retarder for 3D image display, or a viewing angle adjusting film.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: March 9, 2021
    Inventors: Jung Woon Kim, Eun Jung Lim, Dong Hyun Oh
  • Publication number: 20210047874
    Abstract: Disclosed is an access control apparatus according to the present invention. The access control apparatus includes: a body located on a passage; an opening and closing part coupled to the body and having a multi-stepped door adapted to open and close the passage through a translational motion; and a driving part coupled to the body and the opening and closing part to control an operation of the opening and closing part, wherein the driving part has a linear motor and the multi-stepped door includes a first door driven by means of the linear motor and a second door coupled to the first door in such a manner as to be interlocked with the first door.
    Type: Application
    Filed: June 25, 2018
    Publication date: February 18, 2021
    Inventors: Yong Hee HAN, Dong Hyun OH, Dong Ho LEE