The patent's assignee for patent number 8628369 is
News editors obtained the following quote from the background information supplied by the inventors: "Aspects of the present invention relate to an organic lighting emitting diode display device (OLED display device) and a method of fabricating the same, and more particularly, to an OLED display device including a hole injection layer, formed by thermal evaporation using an inorganic semiconductor material, which can be thermally evaporated, and a method of fabricating the same.
"An OLED display device comprises a substrate, an anode disposed on the substrate, an emission layer disposed on the anode, and a cathode dispose on the emission layer. In such an OLED display device, when a voltage is applied between the anode and the cathode, a hole (positively charged particle) and an electron are injected into the emission layer, and then recombined to create an exciton, which transitions from an excited state to a ground state, to thereby emit light.
"The OLED display device may comprise at least one selected from the group consisting of a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer. The hole injection layer can be disposed between the anode and the emission layer to effectively inject the hole from the anode into the emission layer. In a conventional OLED display device, these layers are organic thin films formed of an organic material. However, especially, the hole injection layer formed of an organic material has some problems, for example, poor interface characteristics with an anode formed of a transparent conductive material, such as, indium tin oxide (ITO) or indium zinc oxide (IZO), and damage occurring when the anode is formed by sputtering. Moreover, the hole injection layer cannot completely protect the underlying emission layer from the damage."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "Aspects of the present invention provide an organic lighting emitting diode display device (OLED display device), in which interface characteristics between an anode and a hole injection layer are improved. The display device is driven with a lower driving voltage, and has an improved life span. Aspects of the present invention relate to a method of fabricating the display device.
"According to an aspect of the present invention, an OLED display device comprises: a substrate; a first electrode disposed on the substrate; an emission layer disposed on the first electrode; a second electrode disposed on the emission layer; and a hole injection layer disposed between the first electrode and the emission layer, or between the emission layer and the second electrode. The hole injection layer is formed of an inorganic semiconductor material, which evaporates at a temperature of 1100.degree. C., or less.
"According to another aspect of the present invention, a method of fabricating an OLED comprises: preparing a substrate; forming a first electrode on the substrate; forming an emission layer on the first electrode; forming a second electrode on the emission layer; and forming a hole injection layer of an inorganic semiconductor material, which evaporates at a temperature of 1100.degree. C. or less, between the first electrode and the emission layer, or between the emission layer and the second electrode.
"Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention."
For additional information on this patent, see: Lee, Sang-Bong; Noh, Sok-Won; Seong, Jin-Wook; Kim, Mu-Hyun. Method of Fabricating Organic Light Emitting Diode Display Device. U.S. Patent Number 8628369, filed
Keywords for this news article include: Electronics, Semiconductor, Light-emitting Diode,
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