CRT "dot pitch" versus LCD "screen door effect"/"dot pitch"..

[TheHawk]

I have wondered why the industry and.. well tech sites/people don't refer to "dot pitch" problems in direct view CRTs as a "screen door effect"? as its called on LCD variants.. They can be considered the same thing correct?

Maybe this question belongs in the direct view forum but they dont' acknowledge its existence as much as LCD people for whatever reason.

I am convinced that (mainly) large CRT TVs have worse screen door in comparison with even the worst of (newer) LCDs (of comparible sizes) on the market including LCD projectors.
Why?
Because I've spent a lot of time staring at different models that's why.
There are some cheap HD CRT direct views with some HORRID screen door, I'm dead serious. They must have dot pitchs like over 1.0+.
Unfortunately I have no way to prove my point with hard numbers because neither TVs nor LCD TVs quote their dot pitchs the LARGE majority of the time.
Anyone who can help me in my quest?
Any web sites? Documentation?
I also want to prove this as part of a comparison paper I'm doing in a technology class.

[Kevin C Brown]

I learned something new a few weeks ago. That for CRT monitors, the brightness at the center of the pixel decreases as you go towards the outer edge of each pixel. What that does is to soften the transition to each adjacent pixel. For plasma and LCD at least, the brightness is constant across the pixel, so the transition to each adjacent pixel is sharper. So the screen door effect, if it's apparent, will be worse for those technologies.

So that is simply a factual difference between those technologies. Now, most CRT monitors can obviously handle a 480i signal (and some can do 1080i high def too). But you'd have to look at the CRT at the same effective distance as whatever other display you're looking at. 480p for an ED display, 720p/768p/etc for the plasma, LCD, etc. I think you would find that if you truly made it an apples to apples comparison, that CRT does have the least SDE. But by the same token, *all* technologies will have SDE if you are too close to the screen as well. :)

[memory1]

In most cases the screen brightness of an LCD is not constant across the panel.
This is due to the lightsource behind the panel.

[TheHawk]

I wish I had some pictures to show of some of the HD CRT TVs at my workplace the screen door on them is wretched beyond belief even displaying HD content its highly noticeable. I have an LCD projector so I'm no newbie to screen door effect. I will try and get some pictures later maybe.

[Kevin C Brown]

Maybe you are looking at a poor example of a "quality" HD CRT. :) What's the brand?

It is true, btw, that some manufacturers' tube CRT displays have dropped off in quality recently as they've focussed more attention on LCD, plasma, RPs, projectors, etc.

[Jaa-Yoo]

Are you sure those tube TVs you saw have HD resolution? There are plenty of tubes out right now that have ED resolution but are capable of recieving HD content, and some of them have "HD Ready/Compatible" branded on them.