Explore a groundbreaking security vulnerability in digital screens through this IEEE conference talk. Delve into WaveSpy, an innovative through-wall screen attack system that uses millimeter-wave sensing to remotely infer screen content, even in isolated environments. Learn about the relationship between screen content and liquid crystal states, and how this can be exploited to bypass traditional security measures. Examine the system's components, including a low-cost mmWave probe, and its effectiveness in recognizing screen content types and retrieving sensitive information. Analyze the evaluation results across various scenarios and discuss potential countermeasures to mitigate such attacks. Gain insights into the implications of this research for screen security and the need for new protective strategies in the digital age.