Abstract: An epitaxial wafer is disclosed. The epitaxial wafer includes a substrate; and a stack structure disposed on the substrate, wherein the stack structure includes first and second layers alternately stacked on top of each other, wherein the first layer is made of a compound represented by one selected from a group consisting of following Chemical Formulas 1-1 to 1-5, wherein the second layer is made of a compound represented by a following Chemical Formula 2: Si1-xGex(m?x?1.0)??[Chemical Formula 1-1] Si1-x-yGexBy(m?x<1.0,0<y?0.4,0.2<x+y?1.0)??[Chemical Formula 1-2] Si1-x-zGexPz(m?x<1.0,0<z?0.4,0.2<x+z?1.0)??[Chemical Formula 1-3] Si1-x-zGexCz(m?x<1.0,0<z?0.4,0.2<x+z?1.0)??[Chemical Formula 1-4] Si1-x-y-zGexByPz(0.2<x<1.0,0<y?0.4,0<z?0.4,0.2<x+y+z?1.

Abstract: According to some aspects of the disclosure, an organic light-emitting display device including a display panel including a driving thin film transistor (TFT), comprises a sensing unit configured to perform a sensing operation for external compensation of the display panel, and an analog-digital converter (ADC) configured to perform a conversion operation of converting an analog value held in the sensing unit into a digital value, wherein the sensing unit comprises a basic sensing unit configured to perform a sensing operation on the driving TFT, and a dummy sensing unit configured to perform a sensing operation on changes in a gain and an offset of the ADC, and the basic sensing unit and the dummy sensing unit are in a cascade connection to each other.

Abstract: [summary] An epitaxial wafer is disclosed. The epitaxial wafer includes a substrate; and a stack disposed on the substrate, wherein the stack includes silicon (Si) layers and silicon germanium (SiGe) layers alternately stacked on top of each other, wherein the silicon germanium layer is doped with boron (B) or phosphorus (P).

Abstract: A drainage switch that can be used to extract and clean impurities is provided, which is mainly equipped with a set of elastic water stop plugs. The elastic water stop plug is composed of a main body around with elastic blocks, a pressure positioning piece, a lifting piece, and springs that are arranged inside the shaft tube of the main body, and a plug cap that is locked in the pressure positioning piece. The elastic blocks can be elastically against with a water pipe, so that the elastic water stop plug can be elastically clamped in a water pipe, which is easy to install and replace, and easy to take out and clean dirt.

Abstract: An output amplifier includes an input unit including first and second input transistors, and a first bias transistor between a connection node of a source of the first input transistor and a source of the second input transistor and a first voltage source, a first current mirror including first and second transistors connected in series at a first connection node and between a second voltage source and a second connection node, and third and fourth transistors connected in series at a third connection node and between the second voltage source and a fourth connection node, and a second current mirror including fifth and sixth transistors between a fifth connection node and the first voltage source and connected in series at a sixth connection node, and seventh and eighth transistors between a seventh connection node and the first voltage source.

Abstract: Provided is a power supply device for a lighting device for a vehicle composed of a plurality of unit lighting modules which is easy to install and disassemble due to excellent assembly capabilities, and which stably supplies power with excellent connection stability. In the power supply device for supplying power to the lighting device for the vehicle composed of a plurality of unit lighting module, the power supply device includes: a connection rail member provided in each unit lighting module to supply power to a PCB of the unit lighting module; and a connection pin member electrically coupled to the connection rail member in a male and female manner to electrically connect two adjacent power supply modules to each other.

Abstract: Provided is a lighting device to be installed in a vehicle, more particularly, a lighting device having a structure in which a plurality of unit lighting modules are installed on a bracket. Thus, the lighting device may allow users to select the size or shape of the lighting device, to replace or maintain only a unit lighting module where a problem occurs, and to implement various lighting patterns. The lighting device includes: a body; an LED module embedded in the body; the unit lighting module including a front cover being transparent and covering a front of the body; and the bracket on which the plurality of unit lighting modules are installed.

Abstract: Provided is a lighting device to be installed in a vehicle, more particularly, a lighting device having a structure in which a plurality of unit lighting modules are installed on a bracket. Thus, the lighting device may allow users to select the size or shape of the lighting device, to replace or maintain only a unit lighting module where a problem occurs, and to implement various lighting patterns. The lighting device includes: a body; an LED module embedded in the body; the unit lighting module including a front cover being transparent and covering a front of the body; and the bracket on which the plurality of unit lighting modules are installed.