Patents by Inventor Hyeon Gu Cho

Hyeon Gu Cho 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: 8982444
    Abstract: The present inventive concept relates to an electrowetting display device including a lyophobic colloid material and a polymer resin such as an organic layer or a polyimide (PI), and a lyophobic layer including a supporting layer supporting the lyophobic colloid material and using a photoreactive fluorine-based surfactant for a fluorine-based material to be positioned above and for a hardened photoreactive material layer to be positioned below through exposure in a single step without separately performing a hydrophilic treatment and then a water-repellent treatment, thereby reducing the number of processes, the manufacturing time, and the cost.
    Type: Grant
    Filed: January 24, 2013
    Date of Patent: March 17, 2015
    Assignee: Amazon Technologies, Inc.
    Inventors: Bo Ram Lee, Taimei Kodaira, Dae Jin Park, Joo-Han Bae, Seung-Jin Baek, Da Hye Yoon, Hyeon Gu Cho
  • Publication number: 20150072457
    Abstract: A manufacturing method of a liquid crystal display includes: forming a first alignment layer on a passivation layer and a pixel electrode to form a first display panel; forming a second alignment layer on a common electrode to form a second display panel; and combining the first and the second display panels, wherein formation of the first and second alignment layers includes spraying a first alignment mixture and second alignment mixture on, respectively, the first and second display panels using an inkjet head while moving the inkjet head across the first and second display panels to form a first alignment mixture layer and a second alignment mixture layer, and hardening the first and second alignment mixture layers, and spray progressing directions of the first and second alignment mixture are more than 7 degrees to less than 45 degrees with respect to the first substrate and the second substrate respectively.
    Type: Application
    Filed: August 12, 2014
    Publication date: March 12, 2015
    Inventor: Hyeon Gu CHO
  • Publication number: 20150022875
    Abstract: An electrowetting display apparatus includes a first base substrate, a second base substrate which faces the first base substrate, a first electrode on the first base substrate, and a second electrode on the second base substrate, where the second electrode faces the first electrode. A barrier wall is on the first electrode, where the barrier wall defines a storage area. A surface of the first electrode and the barrier wall is overlapped by a barrier layer. In addition, a water-repellent layer is on the barrier layer which is in the storage area. First and second fluids are in the storage area, the first fluid is separate from the second fluid, and the first fluid or the second fluid has a polarity.
    Type: Application
    Filed: October 6, 2014
    Publication date: January 22, 2015
    Inventors: Dong-Hwan Kim, Sang-Il Kim, Tae-Woon Cha, Myung-Hwan Kim, Woo Yong Sung, Jeongho Lee, Hyoung-Wook Lee, Hyeon Gu Cho
  • Patent number: 8854717
    Abstract: An electrowetting display apparatus includes a first base substrate, a second base substrate which faces the first base substrate, a first electrode on the first base substrate, and a second electrode on the second base substrate, where the second electrode faces the first electrode. A barrier wall is on the first electrode, where the barrier wall defines a storage area. A surface of the first electrode and the barrier wall is overlapped by a barrier layer. In addition, a water-repellent layer is on the barrier layer which is in the storage area. First and second fluids are in the storage area, the first fluid is separate from the second fluid, and the first fluid or the second fluid has a polarity.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: October 7, 2014
    Assignee: Liquavista B.V.
    Inventors: DongHwan Kim, Sangil Kim, Taewoon Cha, Myunghwan Kim, Woo Yong Woo Yong, Jeongho Lee, HyoungWook Lee, Hyeon Gu Cho
  • Publication number: 20140285870
    Abstract: An electrowetting display device includes a first base substrate, a plurality of first electrodes disposed on the first base substrate and positioned to respectively correspond to positions of a plurality of pixels, a partition wall disposed on the first base substrate to partition the pixels, a second electrode disposed on the partition wall and including a plurality of openings, a second base substrate facing the first base substrate, and an electrowetting layer disposed between the first base substrate and the second base substrate, the electrowetting layer respectively being moved by voltages respectively applied to the first electrode and the second electrode.
    Type: Application
    Filed: June 9, 2014
    Publication date: September 25, 2014
    Inventors: Byungseok Choi, Seung-Jin Baek, Taimei Kodaira, JiEun Lee, Hyeon Gu Cho
  • Patent number: 8749865
    Abstract: An electrowetting display device includes a first base substrate, a plurality of first electrodes disposed on the first base substrate and positioned to respectively correspond to positions of a plurality of pixels, a partition wall disposed on the first base substrate to partition the pixels, a second electrode disposed on the partition wall and including a plurality of openings, a second base substrate facing the first base substrate, and an electrowetting layer disposed between the first base substrate and the second base substrate, the electrowetting layer respectively being moved by voltages respectively applied to the first electrode and the second electrode.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: June 10, 2014
    Assignee: Liquavista B.V.
    Inventors: Byungseok Choi, Seung-Jin Baek, Taimei Kodaira, JiEun Lee, Hyeon Gu Cho
  • Publication number: 20130301107
    Abstract: An electrowetting display device includes a first base substrate, a plurality of first electrodes disposed on the first base substrate and positioned to respectively correspond to positions of a plurality of pixels, a partition wall disposed on the first base substrate to partition the pixels, a second electrode disposed on the partition wall and including a plurality of openings, a second base substrate facing the first base substrate, and an electrowetting layer disposed between the first base substrate and the second base substrate, the electrowetting layer respectively being moved by voltages respectively applied to the first electrode and the second electrode.
    Type: Application
    Filed: January 15, 2013
    Publication date: November 14, 2013
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Byungseok CHOI, Seung-Jin BAEK, Taimei KODAIRA, JiEun LEE, Hyeon Gu CHO
  • Publication number: 20130242367
    Abstract: An electrowetting display device includes a first substrate, a second substrate, a conductive fluid and a non-conductive fluid. The first substrate includes a first base substrate, a first electrode layer, a hydrophobic insulation layer and a partition wall. The first electrode layer is formed on the first base substrate and includes pixel electrodes spaced apart from each other and a common notch electrode formed between the pixel electrodes. The hydrophobic insulation layer is formed on the first electrode layer. The partition wall is formed surrounding the pixel electrodes and the common notch electrode on the hydrophobic insulation layer. The second substrate is opposite to the first substrate. The conductive fluid and the non-conductive fluid are interposed between the first and second substrates. The conductive fluid and the non-conductive fluid are controlled to vary transmittance of light in accordance with an electric signal applied to the pixel electrodes.
    Type: Application
    Filed: August 27, 2012
    Publication date: September 19, 2013
    Inventors: Hyeon-Gu CHO, Sang-Il KIM, Seung-Jin BAEK, Jin-Woo CHOI
  • Publication number: 20130201547
    Abstract: An electrowetting device includes: a lower substrate and an upper substrate which face each other; a first electrode on the lower substrate; an insulating layer on the first electrode; a second electrode on the upper substrate; and a first fluid and a second fluid between the upper substrate and the lower substrate. The first fluid includes a solvent, a dye and a scattering enhancer.
    Type: Application
    Filed: July 31, 2012
    Publication date: August 8, 2013
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Hyeon Gu CHO, Yung Kyung PARK, Jae Jin LYU
  • Publication number: 20130021661
    Abstract: A transflective display apparatus includes a first electrode and a second electrode, which face each other and are separated from one another by a pixel electrode. In addition, a preparation voltage is applied to the first electrode or the second electrode before applying a driving voltage to the pixel electrode.
    Type: Application
    Filed: May 30, 2012
    Publication date: January 24, 2013
    Inventors: Seung-Jin Baek, Sangil Kim, Yeun Tae Kim, Hyeon Gu Cho