CEE 5244 Lecture Notes - Lecture 25: Grayscale, Oscilloscope, Computer Monitor
5 Apr 2016
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Lecture 25: television, how the pictures are painted, how the signal is communicated, the main job, the main job of a television is to paint a new picture 30 times a second. Can i find anything decent to watch: making a dot where we want it, tv tube shoots an electron beam at a phosphor screen. Electric or magnetic fields deflect the beam. Phosphor lights up (glows) when hit by electrons: getting two dimensions, now orient two sets of plates orthogonal to each other and you can deflect left- right and up-down. If you sweep the electric field on one set of plates (let"s say the left-right), you will draw a trace across the phosphor screen: this is how an oscilloscope works: The beam is repeatedly swept left-to-right at a constant rate. Meanwhile, an input signal tells the up-down plates what to do. End result is a time-trace of what the input signal did.
