I wouls suggest that it is more to do with the operation of a Cathode ray Tube (CRT ) fitted in old style Televisions.
To Quote from
Explain that stuff! Science and technology made simple
''The electron gun circuit splits the video part of the signal into separate red, blue, and green signals to drive the three electron guns. or even a single gun in very old B/W systems
The circuit fires three electron guns (one red, one blue, and one green) down a cathode-ray tube
The electron beams pass through a ring of electromagnets. The electromagnets steer the electron beams so they sweep back and forth across the screen, line by line.
The electron beams pass through a grid of holes called a mask, which directs them so they hit exact places on the TV screen. Where the beams hit the phosphors (colored chemicals) on the screen, they make red, blue, or green dots. Elsewhere, the screen remains dark''.
I suggest that the BEags quoted txt refers to improving the performance of the CRT tubes for such developments as wide screen CRTs etc. The electric
current waveforms applied to the coils that stear the beams are very complex (unlike the voltage waveforms for plate systems for engineering oscilloscopes like those you used to see in the Radar /Radio bay). So lots of fine tuning of those beams is required for a high defination picture.
Alternativly this could all be a load of B.....ks.
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