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How a TV Works in Slow Motion
A fascinating video from one of my favorite channels on Youtube, the Slow Mo Guys. We all understand the concept of building an image on a CRT screen by scanning the electron beam left to right and top to bottom, but in this video they use an ultra high speed camera to see the process as it occurs. At 380,000 fps, the individual scan lines can be seen as they are drawn left to right. They also look at LCD and OLED displays in the video so you can see how these technologies differ. The CRT part is approximately 1:44 - 4:05.
https://www.youtube.com/watch?v=3BJU2drrtCM Last edited by SpaceAge; 01-22-2018 at 10:41 PM. |
#2
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I saw that the other day and almost posted it myself.
I do not think I have ever seen an actual depiction of the beam scanning the face of the tube. Just representations. |
#3
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Yeah! A friend showed me this yesterday, damn cool vid.
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#4
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Nice video. I was surprised to see how short the phosphor persistence actually is, fading out after 2-3 scan lines. MUCH shorter than I thought compared to the visual persistence of the viewer's eyes.
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#5
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Quote:
Rough calculation: Suppose half the light is gone in one microsecond. This means that during that microsecond the spot is approximately 17 THOUSAND times brighter than the average brightness of the picture (which lasts 1/30 of second); so, due to the dynamic range of the eye, the afterglow needs to be only about 1/100 of the average to be visible, or about one two-millionth of the peak. |
Audiokarma |
#6
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I imagined something like that but didn't think of the short persistence.
No one can grow a mustache faster than Mario or Luigi. |
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