Question: How are TVs made

Alice Selby answered on 6 Mar 2019: last edited 6 Mar 2019 12:24 pm

Old TV’s worked with an electron gun. The back was big, to steer the electrons fired to different points on the screen with magnets. The picture is created in colour with red green and blue phosphors/ dyes.

Plasma TV’s are made with a gas in between two layers of glass. The electrons in the gas are excited with the electricity in just that area and emit light with the same filters for colour.

Other new TV’s use LCD which are liquid crystal displays.
The liquid crystals don’t produce light by themselves like the other TV’s so they need a backlight, (usually LEDs now). The crystals kind of act like 2 sets of sunglasses, they can turn on and off by rotating when electricity is put through them. Each pixel has red green and blue sub pixels dyed to create colour.

All TV’s need a receiver – a way to convert the signal back into an image and a backlight or other source. This is a production line making LED TVs: https://www.youtube.com/watch?v=im-M1m8I4xQ

I’m sure someone else might know more but this is what I understand