It should say on the box the phone came in if its AMOLED or SCLD.

 

I had a look at this a few weeks ago, as I'd lost the box for my desire, and was interested in knowing the screen type.
I couldn't find any way of telling anywhere. I did find a page with some different close up pictures of the AMOLED vs SLCD, but they didn't seem a particularly foolproof method (even had I taken some close up pics of my screen, I don't think I could have used them effectively to tell the difference).

So, it seems that no box means no way at all to tell.

Tom

 

Take a look at this vid.. may help you check.

http://www.youtube.com/watch?v=gUF4dLVdFKc&feature=related

 

Check your serial number in settings and the first four digits should give you the month of manufacture. For example HT03 would be March.

 

As that video link suggests, OLED pixels that are displaying black are truly black, giving out (very nearly) zero light whatsoever. Just a shame the HTC UI uses so many shades of dark gray instead of simply a proper black.

On my Desire (and my old "Grrrralaxy"), even when I read an ebook in the dark (with a white-on-black theme), I can only very faintly see the boundaries of the display, that's how black the black is. Is OLED the new black?

What I'm saying is, of course, that if you can see any amount of light off the black pixels, I regret to inform you that you've got yourself a SLCD handset.

 

What does it matter I had Amoled Nexus one and it was the absolute worst, I had screen burn in after only three weeks of use, my Slcd will never have that and the Nexus is now gone!!!!

 

That's correct. It's quite easy to check on your phone without anything special. Just take a photo with a dark towel over the camera lens ensuring you block out all light. Then look at the photo on the display in a darkened room and you'll get the same result as the above video.

No need to regret saying that! I've seen videos of the AMOLED and SLCD side by side, and there are very minor differences. The AMOLED has more contrast and saturation, and deeper blacks. While the SLCD has more natural tones and contrast, and both have the same resolution. Unless you compare them, you'd never really notice that one is different from the other - they're both excellent.

It's kind of like comparing the iPhone 4 with its LCD display to the Desire's LCD which I've done side by side with my friend's iPhone. For all intents and purposes, they're essentially the same. My friend wasn't so impressed with his iPhone 4 after seeing how good the SLCD is on the Desire - the iPhone display just wasn't "stunning" anymore.

 

If the HTxx is the month of manufacture, then mine is July and it's definitely an SLCD. I bought it in August the first day it was actually available for sale here and have loved it ever since. No more iPhone for me.