Road rules1 min ago
Little White Dot
31 Answers
When my sister and I were younger, we would always run up to the TV when it was being switched off to watch the little white dot disappear into nothingness (okay, we didn't have a lot of money, so had to make our own amusement).
My question is this...whatever happened to it?
Why don't modern TV pictures fade to a little white dot anymore?
My question is this...whatever happened to it?
Why don't modern TV pictures fade to a little white dot anymore?
Answers
Pictures were displayed by deflecting a variable intensity electron beam across and down the phosphor coating inside the glass. When power was removed the deflection circuits shut down before the voltage that drew the beam forward had discharged producing a spot near the centre until the heated cathode creating the beam had cooled.
06:58 Mon 30th Jun 2014