>>106250030
>Cambridge study on eavesdropping on CRT users
>CRT impulse response is so fast, can just measure the light intensity variations from a window at high bandwidth with a photodiode, to reconstruct the displayed image

CRTs beat any strobed 480Hz OLED or 600Hz TN panel with DynAc2 (an emulation of the CRT raster scanning) in motion clarity.
Those trails only visible when moving small white shapes on completely black backgrounds.

CRT monitors use medium-short persistence phosphors (P22 family). The red phosphors' luminance decays nearly exponentially. Red decays to 1/3 its intensity in just 170 nanoseconds. The blue and green phosphors however decay in a more complicated manner. Still, blue phosphors decay to 1/3 intensity in just 100 nanoseconds. The green phosphor is slower, taking 1 microsecond to decay to 1/3 its initial intensity. There are no displays that come close to such insanely fast response times, and there won't be for a long time.

The faint phosphor trails are visible due to a long-tailed power law decay component of the blue and green phosphors' impulse response. Even after 10 milliseconds, the green and blue phosphors have only emitted 50% of their stored energy. This is the same reason why in a very dark room, after turning off a CRT, there will be a faint glow for several minutes.