Abstract: The present disclosure provides an organic light emitting device including a first electrode, a second electrode provided to face the first electrode, and an organic material layer including a light emitting layer provided between the first electrode and the second electrode, and the light emitting layer including a compound represented by Formula 1, a compound represented by Formula 2, and a compound represented by Formula 3.

Abstract: An organic light emitting device including a compound of Chemical Formula 1 and a compound of Chemical Formula 2, wherein

Abstract: A disc cartridge is provided. The disc cartridge includes: a lower housing having a window for allowing a recorder or reader to access to a read-out surface of a disc; and an upper housing coupled to the lower housing to ejectably receive the disc between the lower housing and the upper housing, and having at least a portion rotatable up and down with respect to one side of the lower housing until the disc can be ejected.

Abstract: The present invention provides a disc cartridge assembly, by which loading/unloading of a disc is facilitated to enable both one use in a cartridge state and the other a use as a single disc entity. The present invention includes a lower case having a window for a drive access, an upper case provided onto the lower case, the upper case having an exposure window provided to a central part to expose a label face of a disc, a rotating ring rotatably provided within the upper and lower cases to receive an outer circumference of the disc, at least one shutter provided within the upper and lower cases to open/close the window by interoperating with a rotation of the rotating ring, and a rotating means for rotating the rotating ring by interoperating with an external device.