How does it work? How does spinning doesnt distort the display?
In: Technology
Almost all displays – all the way back to black and white television – work one line at a time.
Whether those lines are stacked horizontally or spinning around… actually doesn’t matter at all, to an analog signal, as long as the camera and display work the same way and are synchronized. The main reason we went with particle accelerators instead of spinning disks was that the particle accelerators pointed backwards, out of the way.
For a computer, the math to switch stacked horizontal lines to a single spinning line is trivially easy. Just basic trigonometry, requiring a few hundred millions calculations per second – modern consumer hardware can run *trillions* of basic trigonometric calculations in a second.
We’re used to pixel based displays today, but each LED makes a line, when it’s spinning if the LED is turned on and off at the right time, it can make the Line appear to be at any position.
The first TV’s were of a mechanical type, except the light was static and a spinning disk with a spiral series of holes in it was over the light, each hole made a line and that disk spun, it’s important to get all the frequencies matched, or you’ll get a rolling image.
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