The disclosure describes systems and methods of ranking user interest in physical entities based on the attention given to those entities as determined by an analysis of communications from devices over multiple communication channels. The circuitry may include a wireless transceiver, a wireless broadcast receiver, audio circuitry coupled to the wireless transceiver and the wireless broadcast receiver, a wired headset jack, and a reference voltage device line, and at least one wired headset device line coupled between the audio circuitry and the wired headset jack. The workstation includes a base structure, a body support area, a work surface area, and lift arm. A liquid crystal display controller includes a drive duty selection register capable of being rewritten by a microprocessor, and a drive bias selection register. As the driving circuit switches the scan lines one by one, the newly added discharging unit discharges-the light-emitting device as soon as the next scan line is switched on.