Abstract: The present specification relates to a heterocyclic compound represented by Chemical Formula 1, an organic light emitting device comprising the same, a manufacturing method thereof, and an organic material layer composition.

Abstract: A display apparatus for a portable terminal includes an expandable flexible display unit, a sensing unit including of a plurality of magnets and a plurality of sensors sensing the magnets to sense an amount of display unit area accommodated in an accommodation unit of the display unit, and a controller setting pixel values according to sensed amount of the display unit area.

Abstract: A display apparatus for a portable terminal includes an expandable flexible display unit, a sensing unit including of a plurality of magnets and a plurality of sensors sensing the magnets to sense an amount of display unit area accommodated in an accommodation unit of the display unit, and a controller setting pixel values according to sensed amount of the display unit area.

Abstract: An improved multi-changer Video Cassette Recorder (VCR) for recording or reproducing more than one cassette tape without the need to manually perform an additional cassette tape changing operation, facilitating easier operation of the system. The multi-changer VCR includes a main body of the multi-changer video cassette tape recorder; a deck mechanism provided in the multi-changer video cassette tape recorder; a cassette tape receiving rotation device having a plurality of cassette tape receiving groove sections formed on an upper surface of the cassette tape receiving rotation device for receiving a plurality of cassette tapes. The cassette tape receiving groove sections are arranged at the same plane and are rectangular about the center of the tape casseter receiving rotation device in the length-wise directions of the cassette tape receiving groove sections, so that the upper surface of the cassette tape receiving rotation device is optimized, and the compact size of the same can be achieved.