Patents by Inventor Tae-Wook Koh

Tae-Wook Koh 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).

  • Publication number: 20180350290
    Abstract: A data processing system can store a long-term history of pixel luminance values in a secure memory and use those values to create burn-in compensation values that are used to mitigate burn-in effect on a display. The long-term history can be updated over time with new, accumulated pixel luminance values.
    Type: Application
    Filed: January 18, 2018
    Publication date: December 6, 2018
    Inventors: PAUL S. DRZAIC, ROSS THOMPSON, GUY COTE, CHRISTOPHER P. TANN, JERROLD V. HAUCK, YIFAN ZHANG, JEAN-PIERRE GUILLOU, IAN C. HENDRY, VANESSA C. HEPPOLETTE, TAE-WOOK KOH, ARTHUR L. SPENCE
  • Publication number: 20180247588
    Abstract: An electronic device may be provided with a display. A content generator may generate frames of image data to be displayed on the display. The display may have an array of pixels that emit light to display images. The pixels may contain light-emitting devices such as organic light-emitting diodes, quantum dot light-emitting diodes, and light-emitting diodes formed from discrete semiconductor dies. As a result of aging, the light producing capabilities of the light-emitting devices may degrade over time. The electronic device may have a temperature sensor that gathers temperature measurements and an ambient light sensor. A pixel luminance degradation compensator may apply compensation factors to uncorrected pixel luminance values associated with the frames of image data to produce corresponding corrected pixel luminance values for the display. The compensation factors may be based on aging history information such as pixel luminance history, ambient light exposure, and temperature measurements.
    Type: Application
    Filed: April 30, 2018
    Publication date: August 30, 2018
    Inventors: Jiye Lee, Yifan Zhang, Chieh-Wei Chen, Tae-Wook Koh, Hongwei Chang, Paul S. Drzaic
  • Patent number: 9985251
    Abstract: The present invention is directed towards a thin-film device. In one embodiment, the thin film device comprises a scattering layer comprising a substrate, the substrate comprising a plurality of voids, and a device stock formed atop the scattering layer, wherein the plurality of voids have a high refractive index as compared to a refractive index of the substrate. Another embodiment of the present invention is directed towards a process for fabricating a thin-film device, the process comprising dissolving a precursor in an organic solvent to form a solution, coating the solution onto a substrate to form a film, immersing the film and the substrate into an antisolvent bath for a first period of time so as to form a plurality of air voids within the film, removing the film and substrate from the anti-solvent bath to dry and cure for a second period of time to create a porous film adhered to the substrate, the porous film and the substrate forming a scattering layer.
    Type: Grant
    Filed: October 12, 2015
    Date of Patent: May 29, 2018
    Assignee: The Trustees of Princeton University, Office of Technology and Trademark Licensing
    Inventors: Barry P. Rand, Tae-Wook Koh
  • Publication number: 20160118627
    Abstract: The present invention is directed towards a thin-film device. In one embodiment, the thin film device comprises a scattering layer comprising a substrate, the substrate comprising a plurality of voids, and a device stock formed atop the scattering layer, wherein the plurality of voids have a high refractive index as compared to a refractive index of the substrate. Another embodiment of the present invention is directed towards a process for fabricating a thin-film device, the process comprising dissolving a precursor in an organic solvent to form a solution, coating the solution onto a substrate to form a film, immersing the film and the substrate into an antisolvent bath for a first period of time so as to form a plurality of air voids within the film, removing the film and substrate from the anti-solvent bath to dry and cure for a second period of time to create a porous film adhered to the substrate, the porous film and the substrate forming a scattering layer.
    Type: Application
    Filed: October 12, 2015
    Publication date: April 28, 2016
    Inventors: Barry P. Rand, Tae-Wook Koh
  • Patent number: 8410477
    Abstract: An organic light emitting device having increased outcoupling efficiency, a lighting apparatus including the organic light emitting device, and an organic light emitting display apparatus including the organic light emitting device. The organic light emitting device includes a substrate, a first electrode layer that is uniformly patterned on the substrate, a low refractive conductive layer disposed on the first electrode layer, and having a conductive material with a lower refractive index than a refractive index of an organic layer that is disposed on the low refractive conductive layer, and a second electrode layer formed on the organic layer.
    Type: Grant
    Filed: November 23, 2010
    Date of Patent: April 2, 2013
    Assignees: Samsung Display Co., Ltd., Korean Advanced Institute of Science and Technology
    Inventors: Sung-Hun Lee, Gwan-Hyoung Lee, Chang-Woong Chu, Seung-Hyup Yoo, Tae-Wook Koh, Jung-Min Choi
  • Publication number: 20110140151
    Abstract: An organic light-emitting device includes a substrate, a first electrode layer on the substrate, a patterned refractive layer on the first electrode layer, a taper angle between a patterned end of the refractive layer and a surface of the first electrode being about 20 to about 60 degrees, the refractive layer including a material having a different refractive index than at least one of the first electrode layer and an organic light-emitting layer, the organic light-emitting layer that covers the refractive layer and is on the first electrode, the organic light-emitting layer contacting the patterned end of the refractive layer, and a second electrode layer on the organic light-emitting layer.
    Type: Application
    Filed: December 13, 2010
    Publication date: June 16, 2011
    Inventors: Sung-Hun Lee, Chang-Woong Chu, Gwan-Hyoung Lee, SeungHyup Yoo, Tae-Wook Koh
  • Publication number: 20110121272
    Abstract: An organic light emitting device having increased outcoupling efficiency, a lighting apparatus including the organic light emitting device, and an organic light emitting display apparatus including the organic light emitting device. The organic light emitting device includes a substrate, a first electrode layer that is uniformly patterned on the substrate, a low refractive conductive layer disposed on the first electrode layer, and having a conductive material with a lower refractive index than a refractive index of an organic layer that is disposed on the low refractive conductive layer, and a second electrode layer formed on the organic layer.
    Type: Application
    Filed: November 23, 2010
    Publication date: May 26, 2011
    Applicant: Samsung Mobile Display Co., Ltd.
    Inventors: Sung-Hun Lee, Gwan-Hyoung Lee, Chang-Woong Chu, SeungHyup Yoo, Tae-Wook Koh, Jung-Min Choi