A display device including a plurality of pixels is disclosed. The first database has a transaction log with entries indicating changes made to records in the first database. Both a coherent light source and a sensor array and associated circuitry are configured on the planar substrate. Each of the semiconductor devices may include a contact hole defined by recessed portions of the device isolation layer and the first region of the active region, respectively. The second catadioptric element includes a third surface positioned to reflect the beam, and a fourth reflective surface positioned to focus the beam reflected by the third reflective surface. A fast-opening switch is operably connected the coupling choke on the side of the source of power, and it is designed and arranged to open in case of occurring trouble conditions.