Abstract: The present invention relates to a novel polycyclic compound employed in an organic layer of an organoelectro luminescent device, wherein the organoelectro luminescent device employing the compound according to the present invention has remarkably improved luminous efficiency and a long lifespan. According to the present invention, it is possible to implement a highly efficient and long-life organoelectro luminescent device that can be effectively applied to various display devices.

Abstract: A display device including: display pixels arranged in a display area of a display panel; light sensing pixels arranged in the display area; a display scan driver configured to cause the display pixels to emit light; a light sensing scan driver configured to cause the light sensing pixels to sense light; and a main driving circuit configured to measure a user's biometric information by using light sensing signals provided from the light sensing pixels, wherein the main driving circuit senses the user's touch area when the user's biometric information is measured, and sets a biometric information measurement area and a measurement condition, which includes an emission color and an emission luminance, according to a shape of a sensed touch area and touch area information to measure the user's biometric information.

Abstract: The present invention relates to a novel polycyclic compound employed by an organic layer of an organic light-emitting device, and an organic light-emitting device employing the compound according to the present invention has markedly improved luminous efficiency. According to the present invention, it is possible to achieve a highly efficient organic light-emitting device which can be effectively applied to a variety of display devices.

Abstract: Provided is a driving circuit for an optical disc drive. The driving circuit includes a digital control processor (DCP) comprising an input port to which a signal for driving a tray is input, and an output port outputting a voltage representing an operating state of the optical disc drive. The driving circuit also includes a tray switch that is connected to the input port, an operation display lamp that is connected in parallel with the tray switch, and an electric connection device for connecting the input port and the output port to each other.

Abstract: Provided is a driving circuit for an optical disc drive. The driving circuit includes a digital control processor (DCP) comprising an input port to which a signal for driving a tray is input, and an output port outputting a voltage representing an operating state of the optical disc drive. The driving circuit also includes a tray switch that is connected to the input port, an operation display lamp that is connected in parallel with the tray switch, and an electric connection device for connecting the input port and the output port to each other.