A thin film transistor comprising a gate electrode, a gate insulating layer, an active layer, and source and drain electrodes is provided. An array of electron beam emitters is spaced from and in close proximity to the data storage medium for selectively directing a plurality of electron beams toward the data storage medium. The first and second bias currents are sunk in the first and second circuit legs, respectively. The transmitting apparatus assigns, based on the fed-back reception quality and offset, the streams, thereby controlling the stream multiplex number. A lever, which is rotationally supported about a first axis, is moved in reference to the shaft. Some applications include light emitting diodes having wavelengths between approximately 254 and 290 nm for use in fluorescent light bulbs, hazardous materials detection, water purification and other decontamination environments.