i know. but you can't talk about its effect on "perceived black depth" without first ensuring that the compared monitors have the same actual blacks. in the pictures of the hp monitors it's clear that the actual black in the pictures are way different:
i think ncx is saying that the reason there's a grey splotch on the glossy bezel hp monitor is due to the glossy bezels. even if this is the case (which i highly doubt... more likely a case of accidental additional illumination in that picture from something else) it doesn't showcase the more subtle effect of the bezel's color on perception.
OK, yeah. Looks like differences in AG rather, if the two sets were each taken at the same time and in the same position, respectively.
It does depict the effect in a way, I think, though it's not scientific. It's clear that having a darker surface surrounding the screen will affect perceived black levels on a given display, even if you can't compare different ones conclusively without some controls.