Shining Arcanine wrote:My Dell Dimension 350V's 17" Trinitron Screen could do 85Hz. It had no ghosting, but because the monitor alternated between an image and no image at a given frequency, it tended to produce headaches, especially at lower refresh rates.
As others already pointed out, you're full of garbage through and through, but nobody pointed out this particular quote yet.
CRTs don't alternate between "image" and "no image". Not sure where you got that from. As far as their logic goes, image display is continuous.
I'll be happy to explain it more if you don't get it, however.
After a pixel is hit by the electron gun, its brightness will behave according to mathematical function, where it goes up and then declines, until the next hit, which occurs at exactly 1/<lamda> seconds later. During that period, the pixel will become dim. The entire screen behaves that way and it occurs like a wave, with pixels all behaving the same exact way, at different phase angles from one another depending on how far apart they are in terms of the ordering of their attention from the electron gun. This causes the screen to behave in a strange way, where it essentially goes from light to dark repeatedly.
If you do not believe me, take a picture of a CRT's image with a digital camera and a picture of a LCD's image with a digital camera. You will find that the picture from the LCD is consistent while the picture from the CRT is not. You will likely see a lower dark band and an upper bright band. The upper bright band are the pixels that the electron gun recently visited while the lower dark band is where it is heading. If you look at brightness, you will notice that towards the top of the upper band, it is about the same as the bottom of the lower band. That is the fade-out that occurs and it is why the screen is basically alternating between dark and bright. It is what causes headaches. Higher refresh rates make the phase angles smaller while lower refresh rates make the phase angles larger. A large enough phase angle and you get pixels that are not only dim, but basically black.
Because of the motion of the electron gun, CRTs display a series of pulses of an image rather than a continuous image. If you disagree, I would be interested in hearing how you think CRT technology works. It should make an interesting conversation topic should I make small-talk with a physicist in the future.
Disclaimer: I over-analyze everything, so try not to be offended if I over-analyze something you wrote.