|
 |
On 17/10/2017 12:23, Kenneth wrote:
> Alain <kua### [at] videotron ca> wrote:
>>
>> On a CTR monitor, each pixel is spread over several groups of phosphore
>> patches. Also, the edges of the pixels are somewhat fuzzy, making them
>> blend together, at least, a little.
>
> There's one aspect of a CRT that I still don't quite understand: The electron
> gun(s)--their beams--can be *deflected* using buttons on the CRT... meaning, you
> can 'squash and stretch' the image, so that it completely fills the screen (or
> not!) But the acreen's aperture mask or wire mask (with its discrete holes for
> the phosphors)is a fixed thing. So, I'm wondering how the squashed-and-stretched
> electon beams still manage to correctly 'line up' with those phophors (and it
> seems that they do, or the color mix on the screen would be completely messed
> up-- which it isn't.) I had always assumed that the magnetic bending of the
> beams was done in a continuously smooth way; it *appears* to be smooth. But is
> the squashing-and-stretching actually done in discreet steps, so that the
> individual electron beams always *see* their own proper phosphors?
>
Just guessing here. The current going to the Focusing coils and
Deflection coils are controlled digitally. I think the conversion would
happen before the coils and use a lookup table for the different parameters.
--
Regards
Stephen
Post a reply to this message
|
|
