Patents by Inventor Kwang-Ohk Cheon

Kwang-Ohk Cheon 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: 11309372
    Abstract: An organic light-emitting diode (OLED) display may have an array of organic light-emitting diode pixels that each have OLED layers interposed between a cathode and an anode. Voltage may be applied to the anode of each pixel to control the magnitude of emitted light. The conductivity of the OLED layers may allow leakage current to pass between neighboring anodes in the display. To reduce leakage current and the accompanying cross-talk in a display, the pixel definition layer may disrupt continuity of the OLED layers. The pixel definition layer may have a steep sidewall, a sidewall with an undercut, or a sidewall surface with a plurality of curves to disrupt continuity of the OLED layers. A control gate that is coupled to a bias voltage and covered by gate dielectric may be used to form an organic thin-film transistor that shuts the leakage current channel between adjacent anodes on the display.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: April 19, 2022
    Assignee: Apple Inc.
    Inventors: Jaein Choi, Andrew Lin, Cheuk Chi Lo, Chun-Yao Huang, Gloria Wong, Hairong Tang, Hitoshi Yamamoto, James E. Pedder, KiBeom Kim, Kwang Ohk Cheon, Lei Yuan, Michael Slootsky, Rui Liu, Steven E. Molesa, Sunggu Kang, Wendi Chang, Chun-Ming Tang, Cheng Chen, Ivan Knez, Enkhamgalan Dorjgotov, Giovanni Carbone, Graham B. Myhre, Jungmin Lee
  • Patent number: 11211587
    Abstract: A display may have an array of organic light-emitting diode (OLED) pixels that each have OLED layers interposed between a cathode and an anode. Voltage may be applied to the anode of each pixel to control the magnitude of emitted light. The conductivity of the OLED layers may allow leakage current to pass between neighboring anodes in the display. To reduce leakage current and cross-talk, the thickness of at least one of the OLED layers may be reduced. To maintain the optical cavity of the pixels, transparent optical spacer structures may be inserted. Alternatively, the thickness of the anodes can be increased. To accommodate a common prime layer within the OLED layers, the optical spacers or anodes may be separately patterned to have different thicknesses. Grating structures and photonic crystal structures may be embedded as part of the optical spacers to help control emission at selected viewing angles.
    Type: Grant
    Filed: July 25, 2019
    Date of Patent: December 28, 2021
    Assignee: Apple Inc.
    Inventors: Kwang Ohk Cheon, Aleksandr N. Polyakov, Chen-Yue Li, Chuan-Jung Lin, KiBeom Kim, Nai-Chih Kao, Rui Liu, Wendi Chang
  • Patent number: 11177329
    Abstract: Display structures for controlling viewing angle color shift are described. In various embodiments, polarization sensitive diffusers, independent controlled cathode thicknesses, filtermasks, touch detection layers, and color filters are described.
    Type: Grant
    Filed: June 11, 2019
    Date of Patent: November 16, 2021
    Assignee: Apple Inc.
    Inventors: Aleksandr N. Polyakov, Meng-Huan Ho, Yi Huang, Yi Qiao, David S. Hum, Jean-Pierre S. Guillou, Yanming Li, Jun Qi, KiBeom Kim, Kwang Ohk Cheon, Cheng Chen, Rui Liu, ByoungSuk Kim, Ying-Chih Wang, Hung Sheng Lin, Donghee Nam, Tyler R. Kakuda, Takahide Ishii, Yurii Morozov
  • Patent number: 10872939
    Abstract: Display structures for controlling viewing angle color shift are described. In various embodiments, polarization sensitive diffusers, independent controlled cathode thicknesses, filtermasks, and color filters are described.
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: December 22, 2020
    Assignee: Apple Inc.
    Inventors: Aleksandr N. Polyakov, Meng-Huan Ho, Yi Huang, Yi Qiao, David S. Hum, Jean-Pierre S. Guillou, Yanming Li, Jun Qi, KiBeom Kim, Kwang Ohk Cheon, Cheng Chen, Rui Liu, ByoungSuk Kim, Ying-Chih Wang, Hung Sheng Lin, Donghee Nam, Tyler R. Kakuda
  • Patent number: 10707423
    Abstract: The present invention relates to novel organic compounds containing oligocarbazoles. The compounds are useful for organic light-emitting diodes. The compounds are also useful for charge-transport and charge-blocking layers, and as hosts in the light-emissive layer for organic light emitting devices (OLEDs).
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: July 7, 2020
    Assignee: UNIVERSAL DISPLAY CORPORATION
    Inventors: Lichang Zeng, Suman Layek, Walter Yeager, Kwang-Ohk Cheon, Chuanjun Xia
  • Patent number: 10658441
    Abstract: A display may have an array of pixels formed from organic light-emitting diodes and thin-film transistor circuitry. Each pixel may include organic layers interposed between an anode and a cathode. The organic layers may emit out-coupled light that escapes the display and waveguided light that is waveguided within the organic layers. A reflector may be placed at the edge of the organic layers to reflect the waveguided light out of the display. The reflector may be located within a pixel definition layer and may be formed from metal or may be formed from one or more interfaces between high-refractive-index material and low-refractive-index material. The reflector may be formed from an extended portion of the pixel anode. The reflector may be formed from light-reflecting particles that are suspended in the pixel definition layer.
    Type: Grant
    Filed: August 27, 2018
    Date of Patent: May 19, 2020
    Assignee: Apple Inc.
    Inventors: Kwang Ohk Cheon, Cheng Chen, Chien Lu, Chih-Lei Chen, Chin Wei Hsu, Hui Lu, KiBeom Kim, Lun Tsai, Meng-Huan Ho, Nai-Chih Kao, Pei-Ling Lin, Rui Liu, Shan-Jen Yu, Wendi Chang, Yusuke Fujino
  • Publication number: 20200075693
    Abstract: Display structures for controlling viewing angle color shift are described. In various embodiments, polarization sensitive diffusers, independent controlled cathode thicknesses, filtermasks, and color filters are described.
    Type: Application
    Filed: December 11, 2018
    Publication date: March 5, 2020
    Inventors: Aleksandr N. Polyakov, Meng-Huan Ho, Yi Huang, Yi Qiao, David S. Hum, Jean-Pierre S. Guillou, Yanming Li, Jun Qi, KiBeom Kim, Kwang Ohk Cheon, Cheng Chen, Rui Liu, ByoungSuk Kim, Ying-Chih Wang, Hung Sheng Lin, Donghee Nam, Tyler R. Kakuda
  • Publication number: 20200075683
    Abstract: Display structures for controlling viewing angle color shift are described. In various embodiments, polarization sensitive diffusers, independent controlled cathode thicknesses, filtermasks, touch detection layers, and color filters are described.
    Type: Application
    Filed: June 11, 2019
    Publication date: March 5, 2020
    Inventors: Aleksandr N. Polyakov, Meng-Huan Ho, Yi Huang, Yi Qiao, David S. Hum, Jean-Pierre S. Guillou, Yanming Li, Jun Qi, KiBeom Kim, Kwang Ohk Cheon, Cheng Chen, Rui Liu, ByoungSuk Kim, Ying-Chih Wang, Hung Sheng Lin, Donghee Nam, Tyler R. Kakuda, Takahide Ishii, Yurii Morozov
  • Publication number: 20200066815
    Abstract: An organic light-emitting diode (OLED) display may have an array of organic light-emitting diode pixels that each have OLED layers interposed between a cathode and an anode. Voltage may be applied to the anode of each pixel to control the magnitude of emitted light. The conductivity of the OLED layers may allow leakage current to pass between neighboring anodes in the display. To reduce leakage current and the accompanying cross-talk in a display, the pixel definition layer may disrupt continuity of the OLED layers. The pixel definition layer may have a steep sidewall, a sidewall with an undercut, or a sidewall surface with a plurality of curves to disrupt continuity of the OLED layers. A control gate that is coupled to a bias voltage and covered by gate dielectric may be used to form an organic thin-film transistor that shuts the leakage current channel between adjacent anodes on the display.
    Type: Application
    Filed: April 27, 2018
    Publication date: February 27, 2020
    Inventors: Jaein Choi, Andrew Lin, Cheuk Chi Lo, Chun-Yao Huang, Gloria Wong, Hairong Tang, Hitoshi Yamamoto, James E. Pedder, KiBeom Kim, Kwang Ohk Cheon, Lei Yuan, Michael Slootsky, Rui Liu, Steven E. Molesa, Sunggu Kang, Wendi Chang, Chun-Ming Tang, Cheng Chen, Ivan Knez, Enkhamgalan Dorjgotov, Giovanni Carbone, Graham B. Myhre, Jungmin Lee
  • Patent number: 10573843
    Abstract: An organic light-emitting diode may have transparent electrodes. An organic emissive layer may be interposed between the electrodes. The emissive layer may emit light in response to current injected from the electrodes. The organic light-emitting diode electrodes may cover an electrode area. The electrode area may be square or may have other shapes. To enhance brightness uniformity, portions of the electrodes in a peripheral region (H1, H2) of the electrode area may have higher sheet resistances than a central portion of the electrode area. The electrode area may be square and may have four corners. The higher sheet resistances may be associated with regions of the electrode area adjacent to the corners. Elevated sheet resistances may be produced by forming the electrodes with different thicknesses in different areas or by providing supplemental conductive structures (104) in selected areas of the electrode area.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: February 25, 2020
    Assignee: Apple Inc.
    Inventors: KiBeom Kim, Kwang Ohk Cheon, Rui Liu, Cheng Chen
  • Publication number: 20200035951
    Abstract: A display may have an array of organic light-emitting diode (OLED) pixels that each have OLED layers interposed between a cathode and an anode. Voltage may be applied to the anode of each pixel to control the magnitude of emitted light. The conductivity of the OLED layers may allow leakage current to pass between neighboring anodes in the display. To reduce leakage current and cross-talk, the thickness of at least one of the OLED layers may be reduced. To maintain the optical cavity of the pixels, transparent optical spacer structures may be inserted. Alternatively, the thickness of the anodes can be increased. To accommodate a common prime layer within the OLED layers, the optical spacers or anodes may be separately patterned to have different thicknesses. Grating structures and photonic crystal structures may be embedded as part of the optical spacers to help control emission at selected viewing angles.
    Type: Application
    Filed: July 25, 2019
    Publication date: January 30, 2020
    Inventors: Kwang Ohk Cheon, Aleksandr N. Polyakov, Chen-Yue Li, Chuan-Jung Lin, KiBeom Kim, Nai-Chih Kao, Rui Liu, Wendi Chang
  • Publication number: 20190280221
    Abstract: The present invention relates to novel iridium complexes that can be used in organic light emitting devices (OLEDs). The present invention relates to the iridium complexes, devices comprising the iridium complexes, and formulations comprising the iridium complexes.
    Type: Application
    Filed: May 22, 2019
    Publication date: September 12, 2019
    Applicant: Universal Display Corporation
    Inventors: Bin MA, Edward BARRON, Alan DEANGELIS, Walter YEAGER, Zeinab ELSHENAWY, Harvey WENDT, Ting-Chih WANG, Kwang-Ohk CHEON, Chuanjun XIA
  • Patent number: 10355227
    Abstract: The present disclosure relates to novel iridium complexes that can be used in organic light emitting devices (OLEDs). The present disclosure also relates to devices and formulations that incorporate the iridium complexes.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: July 16, 2019
    Assignee: Universal Display Corporation
    Inventors: Bin Ma, Edward Barron, Alan Deangelis, Walter Yeager, Zeinab Elshenawy, Harvey Wendt, Ting-Chih Wang, Kwang-Ohk Cheon, Chuanjun Xia
  • Publication number: 20190067394
    Abstract: A display may have an array of pixels formed from organic light-emitting diodes and thin-film transistor circuitry. Each pixel may include organic layers interposed between an anode and a cathode. The organic layers may emit out-coupled light that escapes the display and waveguided light that is waveguided within the organic layers. A reflector may be placed at the edge of the organic layers to reflect the waveguided light out of the display. The reflector may be located within a pixel definition layer and may be formed from metal or may be formed from one or more interfaces between high-refractive-index material and low-refractive-index material, The reflector may be formed from an extended portion of the pixel anode. The reflector may be formed from light-reflecting particles that are suspended in the pixel definition layer.
    Type: Application
    Filed: August 27, 2018
    Publication date: February 28, 2019
    Inventors: Kwang Ohk Cheon, Cheng Chen, Chien Lu, Chih-Lei Chen, Chin Wei Hsu, Hui Lu, KiBeom Kim, Lun Tsai, Meng-Huan Ho, Nai-Chih Kao, Pei-Ling Lin, Rui Liu, Shan-Jen Yu, Wendi Chang, Yusuke Fujino
  • Publication number: 20180374423
    Abstract: An organic light-emitting diode may have transparent electrodes. An organic emissive layer may be interposed between the electrodes. The emissive layer may emit light in response to current injected from the electrodes. The organic light-emitting diode electrodes may cover an electrode area. The electrode area may be square or may have other shapes. To enhance brightness uniformity, portions of the electrodes in a peripheral region (H1, H2) of the electrode area may have higher sheet resistances than a central portion of the electrode area. The electrode area may be square and may have four corners. The higher sheet resistances may be associated with regions of the electrode area adjacent to the corners. Elevated sheet resistances may be produced by forming the electrodes with different thicknesses in different areas or by providing supplemental conductive structures (104) in selected areas of the electrode area.
    Type: Application
    Filed: June 23, 2016
    Publication date: December 27, 2018
    Applicant: Apple Inc.
    Inventors: KiBeom Kim, Kwang Ohk Cheon, Rui Liu, Cheng Chen
  • Patent number: 9876173
    Abstract: Novel oligocarbazole compounds containing a triphenylene and an oligocarbazole are provided. The compounds are useful in devices including organic light emitting devices (OLEDs).
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: January 23, 2018
    Assignee: Universal Display Corporation
    Inventors: Lichang Zeng, Walter Yeager, Suman Layek, Bin Ma, Kwang-Ohk Cheon, Chuanjun Xia
  • Patent number: 9761807
    Abstract: The present invention relates to novel organic compounds containing a triphenylene and a carbazole. The compounds are useful for organic light-emitting diodes. The compounds are also useful for charge-transport and charge-blocking layers, and as hosts in the light-emissive layer for organic light emitting devices (OLEDs).
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: September 12, 2017
    Assignee: Universal Display Corporation
    Inventors: Bin Ma, Walter Yeager, Edward Barron, Kwang-Ohk Cheon, Lichang Zeng, Chuanjun Xia
  • Patent number: 9685486
    Abstract: A display may have an array of pixels formed from organic light-emitting diodes of different colors. Each organic light-emitting diode may have an anode, a cathode, and an emissive layer between the anode and cathode. To prevent undesired color shifts with off-axis viewing angles, evaporated color filters may be formed on the cathode in alignment with the light-emitting diodes. The color filters may include red color filters that overlap the red diodes but not the green and blue diodes, may include red, blue, and green filters that overlap respective red, green, and blue diodes, or may include an orange filter that overlaps red and green diodes and a blue filter that overlaps blue diodes. The color filters may serve as a capping layer for the diodes or a capping layer that is separate from the color filters can be incorporated into the display.
    Type: Grant
    Filed: September 22, 2015
    Date of Patent: June 20, 2017
    Assignee: Apple Inc.
    Inventors: Kwang Ohk Cheon, Rui Liu, Cheng Chen
  • Patent number: 9647221
    Abstract: Organic electronic devices comprising a covalently bonded organic/inorganic composite layer. The composite layer may be formed by the reaction of a metal alkoxide with a charge transport compound having one or more hydroxyl groups. Examples of metal alkoxides that can be used include vanadium alkoxides, molybdenum alkoxides, titanium alkoxides, or silicon alkoxides. This composite layer can be used for any of the various charge conducting layers in an organic electronic device, including the hole injection layer.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: May 9, 2017
    Assignee: UNIVERSAL DISPLAY CORPORATION
    Inventors: Raymond Kwong, Chuanjun Xia, Siddharth Harikrishna Mohan, Kwang-Ohk Cheon, Jason Brooks
  • Patent number: 9542892
    Abstract: A display may have an array of pixels. Each pixel may have a light-emitting diode that emits light under control of a drive transistor. The organic light-emitting diodes may have a common cathode layer, a common electron layer, individual red, green, and blue emissive layers, a common hole layer, and individual anodes. The hole layer may have a hole injection layer stacked with a hole transport layer. Pixel circuits for controlling the diodes may be formed from a layer of thin-film transistor circuitry on a substrate. A planarization layer may cover the thin-film transistor layer. Lateral leakage current between adjacent diodes can be blocked by shorting the common hole layer to a metal line such as a bias electrode that is separate from the anodes. The metal line may be laterally interposed between adjacent pixels and may be formed on the planarization layer or embedded within the planarization layer.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: January 10, 2017
    Assignee: Apple, Inc.
    Inventors: Jae Won Choi, John Z. Zhong, Kwang Ohk Cheon, Shih Chang Chang, Young Bae Park