Yong-Joong
Yong-Joong Choi, Suwon-Si KR
Patent application number | Description | Published |
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20100012926 | Organic electroluminescent device - An organic EL device is constructed with a first electrode, a light-emitting layer, a second electrode, and an organic layer which includes a biphenylenediamine compound and is interposed between the first electrode and the light-emitting layer. The organic layer formed between the first electrode and the light-emitting layer has both hole transport and hole injection properties. With this structure, the organic EL device has improved lifetime characteristics in spite of absence of a hole injection layer. A buffer layer including an organic compound with p-type semiconductive property may be further formed between the first electrode and the organic layer including the 4,4′-biphenylenediamine compound to facilitate hole injection from the first electrode and transport an injected hole to the light-emitting layer. Therefore, the organic EL device can have a lower driving voltage, thereby improving a device lifetime. | 01-21-2010 |
Yong-Joong Choi, Yongin-Si KR
Patent application number | Description | Published |
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20090195153 | ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE HAVING SUPERIOR CHARACTERISTICS AT HIGH TEMPERATURE - An organic electroluminescent display device improves driving characteristics at a high temperature and storage characteristics of the organic electroluminescent display device, and prevents pixel contraction phenomena of the device by providing an organic electroluminescent display device comprising a substrate, a first electrode and a second electrode formed on the substrate, and an organic film layer comprising at least one emitting layer between the first electrode and the second electrode. The emitting layer includes at least one phosphorescent dopant, and the dopant is represented by L3M or L2ML′, wherein the M is a transition metal selected from the group consisting of Ir, Pt, Zn and Os, the L and L′ are bidendate ligands coordinated with carbon and nitrogen, and at least one of the L and L′ has 15 or more carbon atoms in the ligand. | 08-06-2009 |
Yong-Joong Kim, Seoul KR
Patent application number | Description | Published |
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20150024780 | MOBILE TERMINAL AND METHOD FOR CONTROLLING PLACE RECOGNITION - A mobile terminal and method for controlling place recognition are provided. The method includes collecting at least one of state information about a mobile terminal and user information stored in the mobile terminal, determining whether a current place of the mobile terminal is a major place that the user has previously visited at least a number of times using the collected information, determining, if it is determined that the current place of the mobile terminal is a major place, whether the current place has been registered using at least one signal received externally, and outputting a result of the determination as to whether the current place has been registered. | 01-22-2015 |