Patents by Inventor Ji-Hwan Yoon

Ji-Hwan Yoon 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: 20130323868
    Abstract: A deposition apparatus includes: a deposition source including a spray nozzle linearly arranged in a first direction and discharging a deposition material; and a pair of angle control members disposed at both sides of the deposition source and controlling a discharging direction angle of the deposition material. Each angle control member includes a rotation axis parallel to the first direction, and a plurality of shielding plates inst7lled about the rotation axis and separated from each other by a predetermined interval around the rotation axis. Although the deposition angle is changed according to the increasing of the process time, the deposition angle is compensated to form a uniform thin film. Also, the organic thin film may be uniformly deposited through each pixel of an organic light emitting diode (OLED) display, thereby increasing luminance uniformity for each pixel.
    Type: Application
    Filed: November 1, 2012
    Publication date: December 5, 2013
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Ja-Hyun Im, Kwan-Hee Lee, Ji-Hwan Yoon, Joong-Won Sim, Tae-Kwang Sung
  • Publication number: 20130112949
    Abstract: An organic light-emitting device including: a substrate; a first electrode; a second electrode; an emission layer between the first electrode and the second electrode; and an electron transport layer between the emission layer and the second electrode, wherein the emission layer includes a blue emission layer, the electron transport layer includes a unit that includes a first single layer including a first material, a first mixed layer on the first single layer and including the first material and a second material, a second single layer on the first mixed layer and including the second material, a second mixed layer on the second single layer and including the first and second materials, and a third single layer on the second mixed layer and including the first material, wherein the first mixed layer has a thickness that is larger than that of the second mixed layer.
    Type: Application
    Filed: July 6, 2012
    Publication date: May 9, 2013
    Inventors: Joong-Won Sim, Kwan-Hee Lee, Ji-Hwan Yoon, Ja-Hyun Im
  • Patent number: 8344969
    Abstract: Example embodiments relate to a display device having first and second substrates arranged opposite to each other, a semiconductor device on the first substrate, an organic light emitting element on the first substrate and an optical unit between the organic light emitting element and the second substrate. The display device may be configured to adjust angle viewing modes, e.g., a narrow angle viewing mode and a wide angle viewing mode, by selectively applying a voltage to the organic light emitting element and the optical unit.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: January 1, 2013
    Assignee: Samsung Display Co., Ltd.
    Inventors: Ji-Hwan Yoon, Kwan-Hee Lee
  • Patent number: 8211233
    Abstract: A method of forming a plurality of multi-layer organic films in a single process includes preparing a first evaporating source that evaporates a first evaporating source material onto a first deposition region and a second evaporating source that evaporates a second evaporating source material onto a second deposition region, wherein the first evaporating source material and the second evaporating source material are different from each other, adjusting the first evaporating source and the second evaporating source in order to obtain a first overlapping region in which the first deposition region and the second deposition region overlap each other, driving the first evaporating source and the second evaporating source to deposit the first evaporating source material and the second evaporating source material onto a portion of an object to be processed, and moving the first evaporating source and the second evaporating source from a first end of the object to a second end of the object to form a multilayer fil
    Type: Grant
    Filed: September 9, 2008
    Date of Patent: July 3, 2012
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventors: Ji-Hwan Yoon, Kwan-Hee Lee, Jae-Hyun Kwak, Dong-Hun Kim, Min-Seung Chun, Jung-Ha Son
  • Patent number: 8192849
    Abstract: An organic light emitting display device that can reach the optimum light emitting efficiency of each pixel while operating at a low voltage. The organic light emitting display device includes a first pixel region emitting a first color, a second pixel region emitting a second color different from the first color, a first layer formed over the first and second pixel regions, and having at least one of a hole injection layer and a hole transport layer, and a second layer formed over the first and second pixel regions, and having hole injectivity higher than the first layer, wherein the first and second layers are sequentially deposited in the first pixel region, and the second and first layers are sequentially deposited in the second pixel region.
    Type: Grant
    Filed: January 27, 2009
    Date of Patent: June 5, 2012
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventors: Choon-Woo Lim, Kwan-Hee Lee, Sung-Jun Bae, Sang-Shin Lee, Ji-Hwan Yoon, Eun-Jung Lee
  • Publication number: 20120121796
    Abstract: A method of forming a film on a substrate includes depositing first and second evaporating source materials respective from first and second evaporating sources onto the substrate while moving the evaporating sources together with respect to the substrate, the first and second evaporating source materials being different from each other and positioned to provide a non-overlapping deposition region of the first evaporating source material, an overlapping deposition region of the first and second evaporating source materials and a non-overlapping deposition region of the second source material such that when the evaporating sources are moved, a film is formed to include a first layer that is a deposition of only the first evaporating source material, a second layer that is a deposition of a mixture of the first evaporating source material and the second evaporating source material and a third layer that is a deposition of only the second source material.
    Type: Application
    Filed: December 15, 2011
    Publication date: May 17, 2012
    Inventors: Ji-Hwan Yoon, Kwan-Hee Lee, Jae-Hyun Kwak, Dong-Hun Kim, Min-Seung Chun, Jung-Ha Son
  • Patent number: 8052497
    Abstract: An organic light emitting device that has improved lifespan properties by improving the characteristics of an interface between at least one of a red emissive layer, a green emissive layer or a blue emissive layer, and an electron transport layer, and a method of manufacturing the organic light emitting device.
    Type: Grant
    Filed: April 10, 2009
    Date of Patent: November 8, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Ji-Hwan Yoon
  • Publication number: 20110240965
    Abstract: An organic light-emitting device including an emission layer including one or more emission layer of a red emission layer patterned in a red light-emitting region and a green emission layer patterned in a green light-emitting region and a blue emission layer formed as a common layer, wherein a blue emission is prevented in at least one region of the red light-emitting region and the green light-emitting region by adjusting the HOMO and LUMO levels of a host and a dopant of the green emission layer and/or the red emission layer.
    Type: Application
    Filed: December 28, 2010
    Publication date: October 6, 2011
    Applicant: SAMSUNG MOBILE DISPLAY CO., LTD.
    Inventors: Ji-Hwan Yoon, Ja-Hyun Im
  • Publication number: 20110215308
    Abstract: An organic light-emitting device and a method of manufacturing the same. The organic light-emitting device includes a substrate, a first electrode formed on the substrate, a second electrode, an emission layer between the first electrode and the second electrode, a hole transport layer between the first electrode and the emission layer, and an electron transport layer between the second electrode and the emission layer. The hole transport layer includes a first hole transport unit comprising: a first hole transport layer comprising a hole transporting material, a third hole transport layer formed on the first hole transport layer and comprising a charge generating material; and a fifth hole transport layer formed on the third hole transport layer and comprising the hole transporting material.
    Type: Application
    Filed: March 8, 2011
    Publication date: September 8, 2011
    Applicant: SAMSUNG MOBILE DISPLAY CO., LTD.
    Inventors: Ja-Hyun IM, Ji-Hwan YOON, Byung-Hoon CHUN, Bum-Suk KIM
  • Patent number: 7999457
    Abstract: An organic light emitting display (OLED) device having an organic light emission unit, the organic light emitting unit including a first electrode layer on a substrate, a second electrode layer on the first electrode layer, and an organic layer between the first electrode layer and the second electrode layer, the OLED device including a first auxiliary electrode layer between the organic layer and the first electrode layer. The organic light emission unit is divided into first, second, and third pixel units. Each of the first, second, and third pixel units includes a second auxiliary electrode layer between the organic layer and the first auxiliary electrode layer. The second auxiliary electrode layers of the first, second and third pixel units are formed to have different thicknesses respectively, so that light beams emitted from the first, second and third pixel units can be provided with a resonance effect.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: August 16, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventors: Ji-Hwan Yoon, Kwan-Hee Lee
  • Patent number: 7994713
    Abstract: An organic light emitting diode (OLED) and a method of fabricating the same are provided. In the OLED, a second electron transport layer having an absolute value of a lowest unoccupied molecular orbital (LUMO) energy level smaller than that of a first electron transport layer is formed between a second electrode and the first electron transport layer, so that the second electron transport layer can suppress injection and transport of electrons under a low voltage condition to maintain a low current density. Accordingly, it is possible to prevent (or block) an element from emitting light when representing the color black. The OLED includes an emission layer on the first electrode, the first electron transport layer on the emission layer, the second electron transport layer on the first electron transport layer, and the second electrode on the second electron transport layer.
    Type: Grant
    Filed: January 8, 2009
    Date of Patent: August 9, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventors: Ji-Hwan Yoon, Byung-Hoon Chun, Seong-Jong Kang, Sung-Jun Bae, Eun-Jung Lee
  • Publication number: 20110181490
    Abstract: An artificial magnetic conductor includes a conductor layer, a ground layer, and a via. The conductor layer is formed in a first direction and includes a plurality of grid cells. The ground layer is formed in a second direction that is opposite to the first direction and generates a lower frequency than that of an artificial magnetic conductor including a plurality of grid cells having the same size as that of the plurality of grid cells of the conductor layer and a conductor plate having a form that is not modified. The via is formed between the conductor layer and the ground layer to electrically connect the conductor layer and the ground layer.
    Type: Application
    Filed: December 23, 2010
    Publication date: July 28, 2011
    Applicants: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
    Inventors: Young Bae JUNG, Soon Young Eom, Soon Ik Jeon, Young Joong Yoon, Jihwan Ahn, Ji Hwan Yoon
  • Patent number: 7898175
    Abstract: An organic light emitting display apparatus includes a first substrate, a plurality of organic light emitting pixels formed on the substrate, a second substrate bonded to the substrate to seal the organic light emitting pixels. A black matrix layer is formed on a surface of the second substrate facing the first substrate and provides a plurality of openings. One of the openings and one of the pixels are aligned. The pixel has a first edge and a second edge and the opening has a first edge and a second edge. The first edge of the pixel is closer to the first edge of the opening than the second edge of the opening. The two edges of the opening are interposed between the two edges of the pixels when viewed from a direction perpendicular to the surface.
    Type: Grant
    Filed: July 20, 2007
    Date of Patent: March 1, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventors: Ji-Hwan Yoon, Sung-Jun Bae
  • Publication number: 20090315452
    Abstract: An organic light emitting display device that can reach the optimum light emitting efficiency of each pixel while operating at a low voltage. The organic light emitting display device includes a first pixel region emitting a first color, a second pixel region emitting a second color different from the first color, a first layer formed over the first and second pixel regions, and having at least one of a hole injection layer and a hole transport layer, and a second layer formed over the first and second pixel regions, and having hole injectivity higher than the first layer, wherein the first and second layers are sequentially deposited in the first pixel region, and the second and first layers are sequentially deposited in the second pixel region.
    Type: Application
    Filed: January 27, 2009
    Publication date: December 24, 2009
    Applicant: Samsung Mobile Display Co., Ltd.
    Inventors: Choon-Woo LIM, Kwan-Hee Lee, Sung-Jun Bae, Sang-Shin Lee, Ji-Hwan Yoon, Eun-Jung Lee
  • Publication number: 20090295282
    Abstract: An organic light emitting display (OLED) device having an organic light emission unit, the organic light emitting unit including a first electrode layer on a substrate, a second electrode layer on the first electrode layer, and an organic layer between the first electrode layer and the second electrode layer, the OLED device including a first auxiliary electrode layer between the organic layer and the first electrode layer. The organic light emission unit is divided into first, second, and third pixel units. Each of the first, second, and third pixel units includes a second auxiliary electrode layer between the organic layer and the first auxiliary electrode layer. The second auxiliary electrode layers of the first, second and third pixel units are formed to have different thicknesses respectively, so that light beams emitted from the first, second and third pixel units can be provided with a resonance effect.
    Type: Application
    Filed: February 27, 2009
    Publication date: December 3, 2009
    Inventors: Ji-Hwan Yoon, Kwan-Hee Lee
  • Publication number: 20090232976
    Abstract: A method of forming a plurality of multi-layer organic films in a single process includes preparing a first evaporating source that evaporates a first evaporating source material onto a first deposition region and a second evaporating source that evaporates a second evaporating source material onto a second deposition region, wherein the first evaporating source material and the second evaporating source material are different from each other, adjusting the first evaporating source and the second evaporating source in order to obtain a first overlapping region in which the first deposition region and the second deposition region overlap each other, driving the first evaporating source and the second evaporating source to deposit the first evaporating source material and the second evaporating source material onto a portion of an object to be processed, and moving the first evaporating source and the second evaporating source from a first end of the object to a second end of the object to form a multilayer fil
    Type: Application
    Filed: September 9, 2008
    Publication date: September 17, 2009
    Applicant: Samsung SDI Co., Ltd.
    Inventors: Ji-Hwan YOON, Kwan-Hee Lee, Jae-Hyun Kwak, Dong-Hun Kim, Min-Seung Chun, Jung-Ha Son
  • Publication number: 20090206741
    Abstract: An organic light emitting device including a plurality of organic layers between a first electrode and an emitting layer, wherein the organic layer includes an electron blocking layer. In one embodiment, a first organic layer, an electron blocking layer, a second organic layer and an emitting layer are formed on the first electrode. The electron blocking layer has a Lowest Unoccupied Molecular Orbital (LUMO) level which is lower than that of the first organic layer. Thus, the electron blocking layer traps excess electrons injected from the emitting layer, thereby improving lifetime characteristics of the OLED.
    Type: Application
    Filed: February 9, 2009
    Publication date: August 20, 2009
    Inventors: Ji-Hwan Yoon, Kwan-Hee Lee, Sung-Jun Bae
  • Publication number: 20090197496
    Abstract: An organic light emitting device that has improved lifespan properties by improving the characteristics of an interface between at least one of a red emissive layer, a green emissive layer or a blue emissive layer, and an electron transport layer, and a method of manufacturing the organic light emitting device.
    Type: Application
    Filed: April 10, 2009
    Publication date: August 6, 2009
    Inventor: Ji-Hwan Yoon
  • Publication number: 20090179559
    Abstract: An organic light emitting diode (OLED) and a method of fabricating the same are provided. In the OLED, a second electron transport layer having an absolute value of a lowest unoccupied molecular orbital (LUMO) energy level smaller than that of a first electron transport layer is formed between a second electrode and the first electron transport layer, so that the second electron transport layer can suppress injection and transport of electrons under a low voltage condition to maintain a low current density. Accordingly, it is possible to prevent (or block) an element from emitting light when representing the color black. The OLED includes an emission layer on the first electrode, the first electron transport layer on the emission layer, the second electron transport layer on the first electron transport layer, and the second electrode on the second electron transport layer.
    Type: Application
    Filed: January 8, 2009
    Publication date: July 16, 2009
    Inventors: Ji-Hwan Yoon, Byung-Hoon Chun, Seong-Jong Kang, Sung-Jun Bae, Eun-Jung Lee
  • Patent number: 7535167
    Abstract: An organic light emitting device that has improved lifespan properties by improving the characteristics of an interface between at least one of a red emissive layer, a green emissive layer or a blue emissive layer, and an electron transport layer, and a method of manufacturing the organic light emitting device.
    Type: Grant
    Filed: December 31, 2007
    Date of Patent: May 19, 2009
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Ji-Hwan Yoon