Building LED screens are architectural-scale systems integrated into exteriors, merging advertising with aesthetic design. Using large-format cabinets (500x1000mm standard) for high-rise installation, they incorporate structural engineering for wind load resistance (up to typhoon level 12). Transparent screens (60%+ transparency) preserve glass curtain wall light, while mesh styles reduce weight. Advanced features include DMX512 control for lighting synchronization, anti-reflective coatings, and solar-powered auxiliaries. Case studies include Times Square-style facades displaying real-time data, art, or campaigns, with some integrating IoT sensors for environmental monitoring alongside display.