Patents by Inventor Joo-Hwan Hwang
Joo-Hwan Hwang 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).
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Patent number: 10109817Abstract: Disclosed is an organic light emitting device. The organic light emitting device includes a first emission unit configured to include a common blue emission material layer which is included in common in a plurality of pixels emitting lights having different wavelength ranges, a second emission unit configured to include a red emission material layer, a green emission material layer, and a blue emission material layer which respectively emit lights having different wavelength ranges, a charge generation layer disposed between the first emission unit and the second emission unit, a first electrode formed as a reflective electrode, and configured to supply an electric charge having a first polarity to the first emission unit and the second emission unit, and a second electrode formed as a semi-transmissive electrode, and configured to supply an electric charge having a second polarity to the first emission unit and the second emission unit.Type: GrantFiled: May 23, 2017Date of Patent: October 23, 2018Assignee: LG Display Co., Ltd.Inventors: Se Hee Lee, Joo Hwan Hwang, Sang Kyoung Moon
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Publication number: 20170256744Abstract: Disclosed is an organic light emitting device. The organic light emitting device includes a first emission unit configured to include a common blue emission material layer which is included in common in a plurality of pixels emitting lights having different wavelength ranges, a second emission unit configured to include a red emission material layer, a green emission material layer, and a blue emission material layer which respectively emit lights having different wavelength ranges, a charge generation layer disposed between the first emission unit and the second emission unit, a first electrode formed as a reflective electrode, and configured to supply an electric charge having a first polarity to the first emission unit and the second emission unit, and a second electrode formed as a semi-transmissive electrode, and configured to supply an electric charge having a second polarity to the first emission unit and the second emission unit.Type: ApplicationFiled: May 23, 2017Publication date: September 7, 2017Applicant: LG Display Co., Ltd.Inventors: Se Hee Lee, Joo Hwan Hwang, Sang Kyoung Moon
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Patent number: 9692013Abstract: Disclosed is an organic light emitting device. The organic light emitting device includes a first emission unit configured to include a common blue emission material layer which is included in common in a plurality of pixels emitting lights having different wavelength ranges, a second emission unit configured to include a red emission material layer, a green emission material layer, and a blue emission material layer which respectively emit lights having different wavelength ranges, a charge generation layer disposed between the first emission unit and the second emission unit, a first electrode formed as a reflective electrode, and configured to supply an electric charge having a first polarity to the first emission unit and the second emission unit, and a second electrode formed as a semi-transmissive electrode, and configured to supply an electric charge having a second polarity to the first emission unit and the second emission unit.Type: GrantFiled: November 26, 2014Date of Patent: June 27, 2017Assignee: LG Display Co., Ltd.Inventors: Se Hee Lee, Joo Hwan Hwang, Sang Kyoung Moon
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Patent number: 9283644Abstract: Disclosed is a heating apparatus for manufacturing a display device, which prevents damage or breakage even though a heating member is deformed by heat, and extends a period for replacement of the heating member, wherein the heating apparatus comprises the heating member for emitting heat so as to heat a material to be deposited on a substrate prepared for manufacturing the display device, a first installing device for supporting the heating member, and a second installing device provided with a passing hole for passing the other end of the heating member therethrough.Type: GrantFiled: December 10, 2012Date of Patent: March 15, 2016Assignee: LG Display Co., Ltd.Inventors: Chul Young Jang, Hyun Taek Lim, Joo Hwan Hwang, Jun Ho Yu, Seok Min Hong
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Publication number: 20150144926Abstract: Disclosed is an organic light emitting device. The organic light emitting device includes a first emission unit configured to include a common blue emission material layer which is included in common in a plurality of pixels emitting lights having different wavelength ranges, a second emission unit configured to include a red emission material layer, a green emission material layer, and a blue emission material layer which respectively emit lights having different wavelength ranges, a charge generation layer disposed between the first emission unit and the second emission unit, a first electrode formed as a reflective electrode, and configured to supply an electric charge having a first polarity to the first emission unit and the second emission unit, and a second electrode formed as a semi-transmissive electrode, and configured to supply an electric charge having a second polarity to the first emission unit and the second emission unit.Type: ApplicationFiled: November 26, 2014Publication date: May 28, 2015Applicant: LG DISPLAY CO., LTD.Inventors: Se Hee Lee, Joo Hwan Hwang, Sang Kyoung Moon
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Publication number: 20130340224Abstract: Disclosed is a heating apparatus for manufacturing a display device, which prevents damage or breakage even though a heating member is deformed by heat, and extends a period for replacement of the heating member, wherein the heating apparatus comprises the heating member for emitting heat so as to heat a material to be deposited on a substrate prepared for manufacturing the display device, a first installing device for supporting the heating member, and a second installing device provided with a passing hole for passing the other end of the heating member therethrough.Type: ApplicationFiled: December 10, 2012Publication date: December 26, 2013Applicant: LG DISPLAY CO., LTD.Inventors: Chul Young Jang, Hyun Taek Lim, Joo Hwan Hwang, Jun Ho Yu, Seok Min Hong
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Patent number: 6899383Abstract: Disclosed is a folding chair comprising a frame and a seat sheet, which has means for protecting a user's vertebral column and means for expanding the seat to improve its seating comfort and stability. The expanding means are connected to both sides of the seat, and the protecting means is coupled at its opposite ends to armrests, upper portions of frame elements or the expanding means. The expanding means are hanged on projections formed by bending upper portions of the front frame elements. The protecting means is held at a certain height on a back rest of the chair but being allowed to be laterally moved by holding means, thereby enabling length of the protecting means to be adjusted. The folding chair may have one or more means for protecting a user's vertebral column.Type: GrantFiled: November 29, 2001Date of Patent: May 31, 2005Inventor: Joo-Hwan Hwang
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Patent number: 6763534Abstract: Disclosed herein is a one-touch collapsible cot. This one-touch collapsible cot includes a folding support frame (1) and a seat (50) held on the support frame (1). The support frame (1) is fabricated with a plurality of braces (3) crosswisely jointed together by a plurality of joints (2), and has a head support brace (10), a leg support brace (20), a midsection support brace (30), and a tension projection (40). The seat (50) has a first brace pocket (60) for receiving the head support brace (10), a second brace pocket (70) for receiving the leg support brace (20), a wing (51) provided with a third brace pocket (80) for receiving the midsection support brace (30), and a locking hole (53) for receiving the tension projection (40) of the support frame (1). The seat (50) is quickly opened by the support frame (1) without leaving any uneven portion thereon.Type: GrantFiled: June 16, 2003Date of Patent: July 20, 2004Inventor: Joo-Hwan Hwang
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Publication number: 20040046428Abstract: Disclosed is a folding chair with a detachable table which is adapted to achieve easy attachment and separation of the chair and the table, thereby improving convenience of its carriage and storage, and its operation efficiency. The table (1) includes a table plate capable of being rearwardly swung to be opened, vertical posts (4 and 4′) disposed at corners of a seat of the chair and X-shaped crossed links (3) disposed among the rear vertical posts (4 and 4′), and the chair includes rear vertical posts (14 or 24) and X-shaped crossed links (13 or 23). The folding chair and the table have means for detachably and rotatably connecting the folding chair to the table.Type: ApplicationFiled: June 17, 2003Publication date: March 11, 2004Inventor: Joo-Hwan Hwang
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Publication number: 20040036323Abstract: Disclosed is a folding chair comprising a frame and a seat sheet, which has means for protecting a user's vertebral column and means for expanding the seat to improve its seating comfort and stability. The expanding means are connected to both sides of the seat, and the protecting means is coupled at its opposite ends to armrests, upper portions of frame elements or the expanding means. The expanding means are hanged on projections formed by bending upper portions of the front frame elements. The protecting means is held at a certain height on a back rest of the chair but being allowed to be laterally moved by holding means, thereby enabling length of the protecting means to be adjusted. The folding chair may have one or more means for protecting a user's vertebral column.Type: ApplicationFiled: June 16, 2003Publication date: February 26, 2004Inventor: Joo-Hwan Hwang
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Publication number: 20040034929Abstract: Disclosed herein is a one-touch collapsible cot. This one-touch collapsible cot includes a folding support frame (1) and a seat (50) held on the support frame (1). The support frame (1) is fabricated with a plurality of braces (3) crosswisely jointed together by a plurality of joints (2), and has a head support brace (10), a leg support brace (20), a midsection support brace (30), and a tension projection (40). The seat (50) has a first brace pocket (60) for receiving the head support brace (10), a second brace pocket (70) for receiving the leg support brace (20), a wing (51) provided with a third brace pocket (80) for receiving the midsection support brace (30), and a locking hole (53) for receiving the tension projection (40) of the support frame (1). The seat (50) is quickly opened by the support frame (1) without leaving any uneven portion thereon.Type: ApplicationFiled: June 16, 2003Publication date: February 26, 2004Inventor: Joo-Hwan Hwang
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Patent number: 6193308Abstract: A collapsible chair with a table is disclosed. In the collapsible chair, two collapsible chair units are arranged abreast on the chair with a gap being defined between them. A rear vertical guide column extends in parallel to the inside back support column of each collapsible chair unit. The two collapsible chair units are coupled to each other into the collapsible single body by two auxiliary connectors, which are individually mounted to the top portion of both the inside back support column and an associated vertical guide column of each collapsible chair unit. A movable guide member is received in each guide column in a way such that the guide member is movable in a vertical direction under the guide of the guide column. The table is movably coupled to the outside end of the guide members of the two collapsible chair units, thus being rotatable around the two guide members forwardly or backwardly.Type: GrantFiled: August 3, 1999Date of Patent: February 27, 2001Inventor: Joo-Hwan Hwang
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Patent number: 6134727Abstract: A folding bed is disclosed. A folding frame has a plurality of legs and a plurality of upper and lower connecting elements which connect the plurality of legs with one another. The plurality of legs include a first set of four legs which extend slantingly and upward through the upper connecting elements in a lengthwise direction of the bed and a second set of two legs which extend slantingly and upward through the upper connecting elements in a crosswise direction of the bed. A seat is fixed to the upper connecting elements and has a first set of four pockets into which the upper ends of the first set of four legs are inserted, respectively. A pair of support sheets are stitched to both sides of the seat, respectively. The pair of support sheets have a second set of two pockets into which the upper ends of the second set of two legs are inserted, respectively. The upper ends of the second set of two legs are fastened to the support sheets.Type: GrantFiled: December 10, 1998Date of Patent: October 24, 2000Inventor: Joo-Hwan Hwang