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WiDi solves a problem many of us have faced: it enables streaming of HD video content from a PC, laptop or a mobile device to a large screen TV, projector or monitor.
WiFi connectivity usually doesn't provide enough bandwidth to stream HD content, but WiDi boasts real-world data rates from 4 Gbit/s, and theoretical data rates are as high as 25 Gbit/s. Since WiDi doesn't need WiFi to work, it has often been described as "wireless HDMI."
So far, however, you needed an external adapter connected to your TV to use WiDi, but the new LG CINEMA 3D Smart TVs will solve that problem with an integrated WiDi chip.