IIRC Hd ready in Europe needed a minimum of 720 vertical lines in wide screen format and accept 720p and 1080i
here is a quote
HD Ready has a minimum resolution of 720 lines for displaying High Definition content.
It can accept HD video formats in 720p and 1080i, but may not display the full resolution from more advanced 1080p sources.
Images may distort slightly, so it's not perfect but you still get
amazing picture quality with Blu-ray DiscsT, upscaled DVDs and
PLAYSTATION©3 games.
In order to use this logo, the TV set needs to be widescreen and must
feature an analogue component as well as an HDMI connection.
HD Ready 1080p is the future. Its screen resolution meets the minimum requirements of HD Ready with the addition of 1920 x 1080 pixels.
It displays 1080i and 1080p content without distortion, which means you
can choose a larger screen than your current TV (even if your room
isn't that big).
The finer detail means you can sit closer to a larger TV screen without
seeing the individual pixels, so you can fully enjoy the next
generation of home entertainment.
On top of this, the HD Ready 1080p logo guarantees that content can be
reproduced at 24Hz (24 frames per second), as well as 50Hz and 60Hz
(e.g. DVD).
HDTV
includes a digital tuner with your TV set, on top of all requirements
for HD Ready. This means you can both receive and display HD content
without adding a tuner box.
HDTV 1080p is the same as HDTV, but it can handle full HD resolution at 1920 x 1080 as well as 24p content (i.e. Blu-ray DiscT movies).