Patents by Inventor Han-Joo Choi

Han-Joo 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).

  • Patent number: 11649385
    Abstract: An adhesive film for polarizing plates, a polarizing plate including the same, and an optical display apparatus including the same are provided. An adhesive film for polarizing plates includes: a (meth)acrylic copolymer, a curing agent, a (meth)acrylic oligomer, and an antistatic agent, and has a modulus of about 0.5 MPa or more at about 25° C. and a surface resistance difference ?SR of about 1.0 log (?/?) or less, as calculated by Equation 1 herein.
    Type: Grant
    Filed: April 6, 2020
    Date of Patent: May 16, 2023
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Woo Jin Jeong, Mi Yeon Yu, Han Joo Choi, Il Jin Kim
  • Patent number: 11237311
    Abstract: A polarizing plate includes a polarizing film, a first adhesive layer or a bonding layer, a retardation layer, and a third adhesive layer, and includes: a UV absorber comprising an indole UV absorber, a phenylbenzotriazole UV absorber, and/or a triazine UV absorber, wherein the UV absorber has a maximum absorption wavelength of 370 nm or higher, the polarizing plate has a light transmittance of 5% or less in a wavelength range of about 400 nm to about 405 nm and a light transmittance of 35% or higher in a wavelength range of about 440 nm to about 450 nm, the first adhesive layer has a modulus of 1×105 Pa or higher at 80° C. and a modulus of 1×105 Pa or higher at 30° C., and the third adhesive layer has a modulus of 5×104 Pa to 1×106 Pa at 80° C. and a modulus of 1×105 Pa to 3×106 Pa at 30° C.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: February 1, 2022
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Seung Jun Lee, Woo Jin Jeong, Yoo Jin Suh, Ha Yun Cho, Han Joo Choi, In Cheon Han
  • Publication number: 20200317969
    Abstract: An adhesive film for polarizing plates, a polarizing plate including the same, and an optical display apparatus including the same are provided. An adhesive film for polarizing plates includes: a (meth)acrylic copolymer, a curing agent, a (meth)acrylic oligomer, and an antistatic agent, and has a modulus of about 0.5 MPa or more at about 25° C. and a surface resistance difference ?SR of about 1.0 log (?/?) or less, as calculated by Equation 1 herein.
    Type: Application
    Filed: April 6, 2020
    Publication date: October 8, 2020
    Inventors: Woo Jin JEONG, Mi Yeon YU, Han Joo CHOI, Il Jin KIM
  • Publication number: 20180203174
    Abstract: A polarizing plate includes a polarizing film, a first adhesive layer or a bonding layer, a retardation layer, and a third adhesive layer, and includes: a UV absorber comprising an indole UV absorber, a phenylbenzotriazole UV absorber, and/or a triazine UV absorber, wherein the UV absorber has a maximum absorption wavelength of 370 nm or higher, the polarizing plate has a light transmittance of 5% or less in a wavelength range of about 400 nm to about 405 nm and a light transmittance of 35% or higher in a wavelength range of about 440 nm to about 450 nm, the first adhesive layer has a modulus of 1×105 Pa or higher at 80° C. and a modulus of 1×105 Pa or higher at 30° C., and the third adhesive layer has a modulus of 5×104 Pa to 1×106 Pa at 80° C. and a modulus of 1×105 Pa to 3×106 Pa at 30° C.
    Type: Application
    Filed: January 12, 2018
    Publication date: July 19, 2018
    Inventors: Seung Jun LEE, Woo Jin JEONG, Yoo Jin SUH, Ha Yun CHO, Han Joo CHOI, In Cheon HAN
  • Patent number: 5978044
    Abstract: A circuit for achieving a special effect in a television set (TV) by means of digital convergence, which includes an operating circuit for operating a digital convergence and a memory for storing special effect data. The circuit includes a first memory for storing special effect data, a second memory for storing standard coincidence data and a CPU for operating on the standard coincidence data so as to produce special effect data in accordance with a user instruction.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: November 2, 1999
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Han-Joo Choi