Back in the late 90s, I saw a demo of a 3D television in a university, where they had a row of ten or so cameras, and had developed a television with an LCD shu

Back in the late 90s, I saw a demo of a 3D television in a university, where they had a row of ten or so cameras, and had developed a television with an LCD shutter in front of it that allowed it to project ten images, so you would see a different image in each eye, and you could move your head around the television to see around the objects portrayed on it. It was nifty technology back then. The disadvantage was that the television had to draw its images ten times faster than a normal screen, in order to project each image in turn. In order to do this with an acceptable brightness, the electron acceleration voltage had to be quite high, and the tube produced an appreciable dosage of X-rays. To cope with this, the cathode-ray tube was actually pointing at the floor, with a mirror underneath it so you could see the image. At the bottom of the unit was a chunky block of concrete to absorb the X-rays and protect the people working on the floor below.