HD Compatible - Deceptive label for something that does not actually have an HD resolution, but does have an HDMI input.
HD Ready -
The accepted & official label for HDTVs in Europe.
To be "HD Ready", a TV must accept 720p & 1080i, must have a minimum native resolution of 1280*720, must have an HDMI (or DVI with HDCP) input, and must have component video input.
http://en.wikipedia.org/wiki/HD_ready
http://en.wikipedia.org/wiki/720p
http://en.wikipedia.org/wiki/1080i
http://en.wikipedia.org/wiki/1080p